Download Use of ABB ADVANT Power for Large Scale Instrumentation

7TH International Conference on Nuclear Engineering
Tokyo, Japan, April 19-23, 1999
ICONE-7458
USE OF ABB ADVANT POWER FOR LARGE SCALE
INSTRUMENTATION & CONTROLS REPLACEMENTS
IN NUCLEAR POWER PLANTS
John L. Pucak: [email protected]
Edgar M. Brown: [email protected]
ABB Combustion Engineering Nuclear Power
Windsor, Connecticut, USA
One of the major issues facing plants planning for life extension is the viability and
feasibility of modernization of a plant’s existing I&C systems including the safety
systems and the control room. This paper discusses the ABB approach to the
implementation of large scale Instrumentation and Controls (I&C) modernization.
ABB applies a segmented architecture approach using the ADVANT® Power control
system to meet the numerous constraints of a major I&C upgrade program. The
segmented architecture and how it supports implementation of a complete I&C
upgrade either in one outage or in a series of outages is presented.
ADVANT Power contains standardized industrial control equipment that is designed
to support 1E applications as well as turbine and non-1E process control. This
equipment forms the basis for the architecture proposed for future new nuclear plant
sales as well as large scale retrofits.
Keywords
Modernization, ADVANT, Architecture, Hierarchy, Benefits, Controls
1
Introduction
The modernization of I&C in nuclear power plants has traditionally been performed
on a case by case piecemeal basis. This has often propagated problems that existed
before upgrading to the new systems. An alternative approach is to make a complete
I&C plant upgrade based on a unified approach and architecture. This method
provides not only new equipment, but a modern upgrade philosophy as well.
Modernization of the I&C systems and the control room to take advantage of
advanced technology is a viable option to support continued and extended plant
operation for the earlier generation nuclear plants.
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The following basic goals and objectives are applied to I&C modernization programs.
•
The modernization program will utilize modern I&C technology that has been
proven by experience and exhibits low technical risk.
•
The modernization program will be accomplished during regularly scheduled
outages to maintain (and not interrupt) present plant power production capability.
The impact on the operator and the associated human factors issues as the control
complex goes through a series of changes must be carefully planned and
synchronized with training and simulation programs. Likewise, because much of the
change-out work for the new I&C is done during an outage, special attention must be
paid to the operability of the I&C needed to support a safe and efficient refueling.
2
ABB Approach to I&C Modernization
ABB’s approach to I&C modernization includes the design, manufacturing, installation
and commissioning of proven, state of the art I&C equipment for replacement of
currently installed equipment. The new systems provide continuity with previous
functionality while taking advantage of enhancements inherent in modern digital
based designs.
I&C modernization covers restoration of the functions of the currently installed
systems and components and realization of defined new functions. It also addresses
possible improvements from the current situation that would be realizable with the
new technology.
Installation of new equipment is accomplished over a multi year period during
scheduled outages and, where permissible, during plant operation. In a similar
manner, some preparatory work will be done in earlier outages in order to assure
completion of work scheduled for a specific later outage. Work Packages approved
by the utility are used to control all site work. These packages contain design,
licensing, installation and testing information associated with a specific modification.
The complete I&C upgrade is implemented through Work Packages with separate
and interrelated time schedules for their implementation.
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The design and implementation of the software and hardware will enable the plant
operation to proceed with minimal interference with present operations while the I&C
modernization goes forward. The implementation will proceed in a manner that
installs each Work Package so that succeeding modifications will not require
extensive rework or replacement of interim hardware and software. The hardware
will improve operability without the necessity for drastic operator training.
3
3.1
Design Considerations
Knowledge and Experience
ABB has long term knowledge and experience in the design and implementation of
analog and computer based monitoring, control and protection systems in nuclear
power plants. This is supplemented with an extensive experience base in I&C
upgrades.
ABB applications represent powerful tools for diagnosis, long-term monitoring and
optimization of power plant processes. They range from detailed process history and
logs to complex calculations and systems serving as diagnostic and decision support
tools. Analog and digital protection system designs have been developed and
installed in over 20 nuclear plants over the last 20 years. Additionally, ABB NSSS
and turbine control systems have played a significant role in the successful operation
of plants throughout the world.
ABB’s ADVANT Power product line has an extensive experience base in industrial
and power applications. The equipment has been installed in many operating
nuclear plants for various applications. Additionally, it has a proven record of user
friendliness with systems and hardware that will enhance plant safety while improving
plant availability and reliability. A major highlight of ADVANT Power product line is its
comprehensive scope of applications addressing the particular needs of power
plants. These applications are based on ABB's in-depth knowledge of and
experience in the power generation industry, have been refined in close cooperation
with clients, and are fully integrated into the control system.
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3.2
Main Control Room (MCR)
The work space design used by MCR personnel on a daily basis is an extremely
important part of the human factors design process. ABB recognizes that there is the
need for close cooperation between the operational and engineering staff and the
control room designers to ensure that the new design is effective and provides a
comfortable environment for both this generation of operators and those to come
over the next 20 years. ABB’s approach to modernization provides;
•
A smooth, evolutionary transition from the existing control room to an advanced
control room
•
Safe, efficient operation through all Work Packages
•
1E hard devices remain where appropriate
•
Software based controls and displays provide the operator with better information
•
Computer based turbine control
•
Extensive graphical display capability provided by the ABB ADVANT Power
control system
3.3
Design Considerations
3.3.1 Logistical & Practical Considerations
Several logistical criteria are established as part of the preliminary design.
These included the following.
•
•
•
•
•
•
•
•
•
•
Cabinets must be easy to move during an outage
Where possible, one for one installation with an existing panel or enclosure
Cabinets should be designed for pre-wiring to reduce on site wiring.
Minimal relocation of equipment after final testing
Minimum relocation of discrete indications and controls
Minimum interference with operator’s daily activities
Limit the total number of times the operator is faced with a change
Increase the use of soft control
Provide large screen displays
Provide a control ‘environment’ that will be comfortable for the present
operators as well as for the operators of the future
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3.3.2 Licensing
ABB has broad experience in designing licensable I&C architectures for international
customers. Foremost in this experience is the licensing of the Nuplex 80+
Advanced Control Complex portion of ABB’s System 80+ Advanced Light Water
Reactor. Through the licensing process, ABB worked with the US Nuclear
Regulatory Commission (USNRC) to resolve digital I&C equipment issues specific to
USA licensing authorities. As a result, ABB designed into the Nuplex 80+
architecture diversity and defense-in-depth between the safety and non-safety
systems. Although Nuplex 80+ is a complete design for new power plants, the basic
principles are also applied to upgrades in the international market.
3.3.3 Diversity and Defense in Depth
The ABB approach for I&C modernization contains architectures which are consistent
with international licensing practices. The architecture described below recognizes
the benefits from ABB’s licensing experience and incorporates different equipment for
Class 1E applications from that used for non-safety systems. This provides diversity
in support of defense-in-depth of the overall design. In addition, where appropriate,
ABB includes a diverse non-safety system to generate a reactor trip on specific
conditions.
For the design described below, Class 1E systems use the ADVANT Power AC 160
processor with S600 local I/O. For the non-safety systems for reactor and turbine
control, ABB uses the ADVANT Power 450 controller and the ADVANT Power S800
distributed I/O.
3.3.4 Installation
In order to assure a seamless transition from existing hardware and software to the
new equipment, care must be given to the dismantling and advance preparations for
each work package, followed by the installation process. Whereas complete system
or sub-system changeover during an outage is the simplest, it is more likely that
portions of the existing systems and components will need to be re-used and/or
reinstalled to return to plant operability, at least on an interim basis, until the system
changeover can be completed. Furthermore, preparations before the given outage
are important to meet the schedule window. In order to be able to implement new
I&C systems in scheduled outages the installation strategy is very important. The
installation should not be seen as a stand-alone activity, it is an integrated process
with detail design and very thoroughly planned, testing and commissioning.
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The basic strategy is to engineer locations for new cabinets to allow pre-installation
as much as possible before an outage. To accomplish this, there may be a need for
temporary solutions or rearrangements of existing cabinets in equipment rooms or
the MCR. Typical pre-installation is mounting of new cabinets, building new
raceways, installing new cables in new cabinets and installing new field equipment.
The goal is to have all I/O and cabinets and as much cabling as possible, installed
before the outage and to do a large part of the testing. The benefit of having all
central equipment and infrastructure installed pre-outage is that it is only necessary
to connect the objects and sensors during the outage. Defining the right sequence,
with good planning and coordination for mounting the field equipment, makes it
possible to start commissioning early and will shorten the outage length.
4
ABB ADVANT Power Control System
Figure 4-1 ADVANT Power Control System
4.1
System Overview
The ADVANT Power Control System is a scaleable, distributed control system for
power plants. It is based on the proven ADVANT Power OCS, (Open Control
System), hardware platform, and enhanced by power plant specific products. It
combines ABB's far-ranging expertise and know-how as a major supplier of both
power generating equipment and control systems.
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4.2
Scalability and Reliability
The ADVANT Power Control System comprises a range of products suitable for use
in power plant application. Depending on the size, complexity and demands of the
power plant or parts thereof, ADVANT Power Control System components can be
combined to provide the most cost- and performance-effective solution. Initially, the
investment can consist of stand-alone process controllers, and, optionally, local
operator stations for control and supervision of a specific process section. Several
process controllers can be interconnected and, together with central operator and
information management stations, can make up a control network.
ABB is committed to providing the highest quality products designed to operate under
the harshest of environments. High internal quality standards ensure that ABB
development, manufacturing and engineering practices withstand the toughest
scrutiny. ABB uses state-of-the-art production methods to produce highly reliable
control systems. In addition, self-diagnostic routines safeguard hardware and
software integrity. Additional reliability can be achieved through redundancy at all
levels.
4.3
Complete Vertical and Horizontal Integration
ADVANT Power manages logic control just as easily as it manages sequence,
closed-loop and drive control as well as protection functions, all in the same
hardware and software. This "horizontal" integration of functions allows control
engineers to solve control problems in a natural way and freely mix the different
control disciplines in application programs without limitations imposed by the system
itself, and it enables process operators to supervise and control the entire plant from
a single workplace.
Thanks to the incorporation of open system standards, ADVANT Power also supports
the "vertical" integration of process execution, process operation and optimization,
and enterprise management by providing to each the relevant information. This
allows plant managers to examine key aspects of power generation at any time - in
real-time - and it facilitates process operators to plan for generation adjustment, to
access the current cost of generated power, or to survey the long-term plant
behavior.
ADVANT Power promotes a single consistent and user-friendly environment for all
engineering and management tasks, fostering better communication between people
and higher organizational flexibility.
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5
5.1
Sample Architecture
Hierarchy
The I&C architecture is designed to provide a well-structured control and display
hierarchy. The general assignment of ADVANT Power equipment to portions of the
I&C architecture is shown in Figure 5.1.
A block diagram of the overall I&C Configuration is provided as Figure 5.2. It details
how the various levels and segments of the hierarchy interface to provide an
integrated control structure. The strength of this architecture is that it is composed of
well-proven, standard products that have been adapted to provide a cost-effective
realization of the architectural, functional, and performance requirements.
Figure 5.1
I&C Hierarchy
Operator Control & Monitoring Level
Hard
MMI
HSSL – actuation
AF 100 – MMI
Communication Level
Processing Level
AC 160 actuation and
control
S600 Local I/O
Hard & Soft
AS 500 OS
AF 100 – Control
MB 300 Inform.
Ethernet TCP/IP
AC 450 control
AC 70 MMI
Plant Computer
S 800 Distributed I/O
Process Interface Level
Class 1E
Non-Safety
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5.2
Operator Control & Monitoring Level of the Hierarchy
At the highest level of the I&C architecture are the systems which directly support the
operator in monitoring and control of the plant.
These systems include:
•
•
Video Display Unit (VDU) Interfaces and
Discrete MMI Device Interface
5.2.1 Operator Video Display Unit Interface
The operator interface for the displays and controls presented on Video Display Units
include the following major elements.
Large Display Screens – for providing overview information on the reactor, turbine
and overall plant. There are three Large Display Screens; one for an Integrated
Plant Status Overview (IPSO), one for a Reactor Overview, and one for a Turbine
Overview
Operator Console Displays – for providing detailed control and display information for
the reactor and turbine located on the operator’s consoles. On the Reactor Console
there are four VDUs, two for reactor and overall plant display and control, and two for
alarms. On the Turbine Console there are three displays per turbine. For each
turbine, there are two for turbine control and display, and one for alarms.
Each VDU has an operator interface for interacting with the display to effect the
required display and control functions. The VDUs and their associated Man Machine
Interface (MMI) are supported by ADVANT Power AS 500 operator workstations (AS
500 OS). The AS 500 OS receives plant information from the MasterBus 300 plant
information network. Soft control commands are sent from the AS 500 OS to the
appropriate controller via the MasterBus 300 network.
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5.2.2 Operator Interface for Discrete MMI Devices
The operator interface includes discrete devices for implementing selected portions
of the MMI design, such as the Class 1E controls and displays, in the Main Control
Room. Each major segment of the plant control system supports discrete MMI
devices such as meters, switches, controllers, recorders, etc.
The discrete MMI devices are interfaced to the control systems by means of I/O and
processors mounted within the Main Control Panels and pre-wired to the MMI
devices. The I/O processors and associated I/O are separated into three major
segments:
•
Class 1E segment with four separate and independent channels of I/O and
associated AC 160 processors. Each channel of Class 1E MMI communicates
with a separate AF 100 network segment dedicated to that channel as described
in the Communications Level.
•
Process 2E (non-safety) segment with distributed AC 70 controllers and
associated S 800 I/O. The reactor 2E segment communicates with the reactor 2E
controllers by means of a dedicated AF 100-network segment for reactor 2E MMI.
•
Turbine 2E segment with distributed AC 70 controllers and associated S 800 I/O.
The turbine 2E segment communicates with the turbine 2E controllers by means
of a dedicated AF 100-network segment for turbine 2E MMI.
Each of the three major MMI segments utilizes local controllers to provide very fast
response to operator commands. High speed, dedicated AF 100 network segments
are used to communicate MMI control commands to the appropriate main controllers
within the segment and to update the segment MMI display devices with information
received from the segment controllers.
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5.3
Processing Level of the Hierarchy
Different members of the ADVANT Power family of equipment have been selected for
the Class 1E functions and the non-safety functions. This selection difference
provides diversity between 1E and non-safety, which is consistent with a safety
philosophy of “defense in depth.”
The different selections also utilize equipment which can efficiently be matched to the
tasks and which are standardized within ABB for the 1E and 2 non-safety functions.
The ADVANT Power Model AC 100 Series controllers have been qualified for safety
applications.
The ADVANT Power model AC 450 controller has a significant level of operating
experience in a number of process industries including fossil power plant and nuclear
power plant control.
Following the philosophy of controller selection described above, the ADVANT Power
Model 600 Series Local I/O has been selected for the Class 1E functions and the
ADVANT Power Model S800 Remote I/O has been selected for class 2E functions
5.4
Communications Level of the Hierarchy
The communications level of the hierarchy provides the information paths for
communication between the Operator Control and Monitoring hierarchical level and
the Processing level of the hierarchy. The Communications Level of the hierarchy
for 2E systems contains the following major network elements.
5.4.1 Plant Wide Control Network
A high speed, redundant, deterministic network is utilized for critical control functions.
This control network utilizes ADVANT Power AF 100 network technology.
The 2E control functions are functionally segmented into individual ADVANT Power
AC 450 controllers. The segmentation includes:
•
1E/2E Interface Controllers – two controllers for interfacing the class1E systems
to the class 2E systems. There is one controller for channels A/C and one
controller for B/D. The four individual safety channels/trains are isolated before
they are connected to the 1E/2E Interface Controllers. The 1E/2E Interface
Controllers provide a 1E data server function for the 2E systems, which utilize 1E
data.
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•
Reactor 2E Controllers –AC 450 controllers (6 shown in the example) for
implementing the reactor 2E control functions.
•
Turbine 2E Controllers - AC 450 controllers (14 shown in the example) for
implementing the turbine and secondary plant control functions.
The controller segmentation is designed to minimize traffic on the plant-wide control
network so that only critical signals between controllers are communicated on this
network. The plant wide control network has a bus topology. When bus segments
leave a room, they are converted from a wire media to fiber optic media until the bus
segment enters the next room where a conversion from fiber optic media back to wire
is performed.
5.4.2 Plant Wide Information Network
A high speed, redundant information network is provided in the architecture to
provide display information for the operator and for transmitting soft control
commands to the AC 450 controllers. The plant wide information network is
implemented in ADVANT Power Master Bus 300 technology.
The plant wide network also supports the collection of plant data for the plant
computer system. Transmission of plant computer data for use in operator
workstation displays that have a composite of plant computer calculated data points
and plant control and display signals from the 2E controllers is also over this network.
The topology of the MasterBus network is a logical bus. To improve the bandwidth
and to provide for the required isolation between rooms and nodes, the physical
topology of the MasterBus network follows a star topology.
5.4.3 Plant Wide Ethernet Network
The plant wide Ethernet network utilizes the TCP/IP protocol. This network provides
for the following major communications functions:
Process Computer to External Systems – for collecting information from external
systems, outside the modernization scope. The Ethernet network communicates
directly with external systems that use the Ethernet TCP/IP protocol. A gateway is
provided to interface external systems that utilize non-Ethernet protocols, such as RS
232. The gateway provides for communications media and protocol conversion for
the non-Ethernet based external systems.
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Plant Computer to AS 500 OS Workstations – for transmitting operator requests for
display information to the plant computer from the workstations and for transmitting
display information from the plant computer to the workstations.
X Terminal Display – for support of display information in the Main Control Room
Panels. The X terminals are connected to the workstations and the plant computer
network
The plant computer and Ethernet Switches are connected to a Fast Ethernet
Backbone (100 Mbps). The Ethernet switches provide separate 10 Mbps connection
to the connected nodes. A typical switch segment is shown which contains two
workstations and 6 X terminals. The typical node connection applies to 6 of the
switches. The two additional Ethernet switches would connect the gateway for the
external systems and the five remaining AS 500 OS workstations.
5.4.4 Class 1E Communications
The Class 1E-safety systems are divided into four separate and independent
channels/trains. Each channel has an internal communications network and an
external communications network. The external networks that leave a channel
boundary are as described below.
5.4.4.1
External Communications
5.4.4.1.1 Inter-channel Trip Actuation Status
Each channel provides its Bistable trip status to the other three channels over a point
to point, high speed, deterministic data link. These links are fiber optic and are
configured to provide communications isolation between channels.
5.4.4.1.2 External Transfer of 1E Information to 2E
Each channel has communications isolation and electrical isolation to provide 1E
signal and status information to the 2E systems for control and display functions
In addition, for the Class 1E signals and status information leaving the channel
boundary, there are two elements in the communication path to the 2E systems.
First, the Class 1E-channel gateway processors provide communication isolation
from the processors internal to a channel. The fiber optic cable that connects the
gateway to the 1E/2E Interface Controller provides electrical isolation. The
communications between the channel gateway processors and the 1E/2E Interface
Controllers is ADVANT Power AF 100.
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The 1E/2E Interface Controllers receive the information from the gateway processors
and then provide a data server function for the 2E systems.
5.4.4.2
Class 1E Internal Communications
The Class 1E channels perform the following major internal communications
functions:
5.4.4.2.1
Actuation Communications
The actuation communications functions involve the transmission of channel trip
status information through the trip/actuation path as follows:
1. Channel trip to Local Coincidence Logic (LCL)
2. ESF Actuation status from the LCL to the 1E Division Controller (LCL directly
initiates reactor trip)
3. ESF Actuation Status, ESF Reset Status, and Diesel Sequence Control
Commands to the Loop Controllers. The Loop Controllers utilize the actuation
status, reset status and diesel sequence status to determine the system level
command that override the manual control from the MMI.
The primary method of communicating actuation status information is by the use of
the ADVANT Power High-Speed Serial link (HSL). HSL is a cyclic transmission of
status on a point to point basis and is deterministic. As will be described below, the
interface and test network is used to transmit a diverse actuation status from the
channel trip through the trip/actuation status path to provide a diverse back up to the
HSL.
An AF 100 deterministic network connects the Main Control Room Panel discrete 1E
MMI processors to the Division and Loop Controllers that provide for control of 1E
objects and display of 1E loop information. The connection from the Main Control
Room to the Relay Room utilizes fiber optic media. The AF 100 MMI network is
redundant within the channel.
Also connected to the AF 100 MMI Network are the soft controllers and displays in
the Remote Shutdown Panel (RSP). A command from the RSP soft controller will
cause the Division and Loop Controllers to transfer control from the Main Control
Room to the RSP. The Division Controllers pass the control transfer commands to
the Bistable and LCL Processors over the interface and test network connections.
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5.4.4.2.2
Interface and Test Processor Network
The interface and test processor (ITP) network is an AF 100 network that has the
following major functions:
•
Automatic testing of the safety system functions by the ITP processor
•
Communication of the Bistable and LCL Processors with the Safety System
Operators Module on the reactor operators console
•
Communication for maintenance, manual semiautomatic test, and manual test
functions from the Maintenance and Test Panel (MTP)
•
Transmission of diverse backup actuation commands from the LCL processors to
the Division and Loop Controllers
5.5
Process Interface Level of the Hierarchy
The ADVANT Power System offers both Class 1E qualified I/O systems based on
S600 I/O and Class 2E I/O systems based on S800 I/O. Both I/O systems cover all
data acquisition tasks needed in power plant control as T/C, RTD inputs, time
stamping and others.
6
6.1
Benefits
General
The ADVANT Power Control System is already in successful use in several power
plants over the world. The technology is fully adapted to the needs of power plant
control, protection and monitoring. This gives a high stability and reliability, to best
support operators and maintenance engineers.
6.2
Key Features and Benefits
The incorporation of ADVANT Power Technology into a modernization program will
enable the following features to benefit plant operation.
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6.2.1
Complete Vertical and Horizontal Integration
The ADVANT Power Control System manages logic control just as easily as it
manages sequence, closed-loop and drive control as well as protection functions, all
in the same family of hardware and software. This “horizontal” integration of
functions allows control engineers to solve control problems in a natural way and
freely mix the different control disciplines in application programs without limitations
imposed by the system. It also enables process operators to supervise and control
the entire plant from a single workspace.
Thanks to the incorporation of open system standards, the ADVANT Power Control
System also supports the "vertical" integration of process execution, process
operation and optimization, and enterprise management by providing the relevant
information. This allows plant managers to examine key aspects of power generation
at any time - in real-time - and it facilitates process operators to plan for generation
adjustment, to access the current cost of generated power, or to survey the long-term
plant behavior.
6.2.2
Scalability and Reliability
The ADVANT Power Control System comprises a range of suitable products, which
can be configured in a multitude of ways. Depending on the size, the complexity and
demands of the power plant or parts thereof, ADVANT Power Control System
components can be combined to provide the most cost-and performance-effective
solution. Initially, the investment can consist of stand-alone process controllers, and,
optionally, local operator stations for control and supervision of a specific process
section. Several process controllers can be interconnected and, together with central
operator and information management stations, can make up a control network.
ABB is committed to providing the highest quality products designed to work under
the harshest of environments. High internal quality standards ensure that ABB
development, manufacturing, sales and engineering practices withstand the toughest
scrutiny. ABB uses state-of-the-art production methods to produce highly reliable
control systems. In addition, self-diagnostic routines safeguard hardware and
software integrity. Additional reliability can be achieved through redundancy at all
levels.
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6.2.3
Use of 32 Bit Processor Modules for AC 450
The Motorola 68040 processor is a 32-bit virtual memory microprocessor with an
integrated floating-point unit and with dual independent instruction and data demand
pages memory management units (MMU’s). The dynamic RAM memory is organized
as a 64-bit memory with cyclic redundancy check sum.
6.2.4
Remote I/O
The flexibility of the remote I/O system (S800) helps to solve the problems in
modernization of I/O in nuclear power plants. By using optical field bus cables, the
separation of Class 2E from 1E can easily be handled.
6.2.5
Display Access
Through the operator station AS 500 OS, the operator has access to any process
input and plant variable available in the control system.
The operator is trained and assisted in the information structure by mimics, object
displays, and cross referencing which allows testing, easily controllable access at any
time, and up-to-date status of the process. According to given plant procedures, the
information access to plant operators may be restricted to the plant area to be
controlled based on work place.
6.2.6
Single Uniform Programming Language
Although the Class 1E and Class 2E controllers are different and diverse in hardware
and software, the engineering stations use the same source and the same
programming language. Applications developed on AC160 are interchangeable with
AC450 applications.
6.2.7 Proveness
The ABB Architecture is based on two proven aspects, the ADVANT Power product
line and proven experience in Nuclear I&C design
ADVANT Power provides a seamless integration of the distributed systems. It has a
very large installed operational base world-wide and is a well proven solution for
Class 1E systems, class 2E systems, plant computers and simulators. ABB
experience in nuclear control system design provides confidence that the system will
meet safety, operation, and licensing goals.
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Safety Channel as shown. Channels B, C, D Similar
Safety MMI on
Main Control Room Panels
AC
160
Operators
Module
S
600
S
8
AC
70
VDUs
Large
Display
Main Control Room
Turbine Panels
Large
Display
VDUs
AS
500
S
800
AS 500
AC
70
HSSL
Gateway
to
External
Systems
Plant Computer
AF 100 MMI Turbine 2E
AC 160
LCL
Processors
A
HSSL
Division
Controller
Processors
A
HSSL
AS
500
AC 160
Loop Cntrs
A
S
600
1E
Soft
Cntrs
.
Remote
Shutdow
n
Room
AC 160
Loop Cntrs
A
S
600
Gateway
Processors
A
From
B&D
Reactor
AC 450
Reactor
AC 450
Reactor
AC 450
Rod
Control
AC 160
S
800
S
800
S
800
S
800
S
800
S
800
S
800
AS
500
1E
VDU
& Test Panel
AF 100
Test Reactor 1E
AF 100 Plant Wide Control
S
600
Maintenance
A
AS
500
MasterBus 300
AF 100 MMI Reactor 2E
Interface &
Test
Processor
A
VDUs
Ethernet TCP/IP
AC 160
Bistable
Processors
A
To B, C, D
From B, C,D
Plant Overview Displays
Reactor
Main Control
Room
Panels
AF 100 MMI Reactor 1E
S
600
Reactor 1E
Large
Display
Turbine
AC 450
Waste
Panel
AC 450
S
800
S
800
S
800
AS
500s
Waste
S
800
Reactor 2E
Turbine
AC 450
S
800
S
800
S
800
S
800
S
800
S
800
S
800
S
800
S
800
Disposal
Panel
From
C
Turbine
AC 450
Turbine 21 and Turbine 22
S
800
Figure 5.2 Sample Architecture
1E/2E Intf.
Processors
A/C
S
800
1E/2E Intf.
Processors
B/D
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Copyright 1998. Combustion Engineering, Inc. All rights reserved