Download Incorporation of QME Case-007 into QME-1 For QV

Incorporation of QME Case-007 into QME-1
For QV-7450 Seismic Qualification
Change: (b) Qualification of valve assemblies shall be in accordance with IEEE
Std 344 or Nonmandatory Appendix QR-A.
To: (b) Qualification of valve assemblies shall be in accordance with IEEE Std
344 or Nonmandatory Appendix QR-A. For valve assemblies with extended
structures and IEEE Std 382 qualified actuators, one acceptable method of
seismic validation of the valve/actuator interference is static side load testing.
Nonmandatory Appendix QV-B provides a methodology to perform this
evaluation.
For QV-7650 Seismic Qualification
Change: (b) Qualification of valve assemblies shall be in accordance with IEEE
Std 344 as addressed in NRC Regulatory Guide 1.100 (Revision 2) or
Nonmandatory Appendix QR-A.
To: (b) Qualification of valve assemblies shall be in accordance with IEEE Std 344
or Nonmandatory Appendix QR-A. For valve assemblies with extended
structures and IEEE Std 382 qualified actuators, one acceptable method of
seismic validation of the valve/actuator interference is static side load testing.
Nonmandatory Appendix QV-B provides a methodology to perform this
evaluation.
Include the following nonmandatory appendix to QV. (I have used QV-B
instead of QV-A because QV-A was previously used in earlier editions of QME1.)
Nonmandatory Appendix QV-B
Static Side Load Testing for Power Actuated and Relief Valve Assemblies
QV-B1000
SCOPE
(a) This Nonmandatory Appendix applies to active valve assemblies in
nuclear facilities that must be qualified to function when subjected to earthquake
(seismic) loads.
(b) This nonmandatory appendix is only applicable to seismic qualification
discussed in QV-7450 and QV-7650. All other provisions of Section QV, including
functional qualification in QV-7460, QV-7560, and QV-7660, continue to apply.
(c) Seismic qualification of the actuator itself is under the scope of IEEE Std
382 or IEEE Std 344, as applicable.
(d) Note that special support of the valve body is allowed to ensure that the
test loads adequately stress the valve body and actuator interface instead of the
valve body ends.
QV-B2000
PURPOSE
The purpose of this Nonmandatory Appendix is to provide the requirements and
recommended practices for one method of seismically qualifying active valve
assemblies to demonstrate that active mechanical equipment in nuclear facilities
can function during or following a design basis earthquake. Assemblies with
extended structures may use the following requirements for seismic qualification
testing. This testing shall be termed static side load testing. Static side load
testing is a seismic test intended to demonstrate the functional capability of the
combination of a QME-1 qualified valve and a QME-1 qualified actuator when
subjected to loading that is representative of a specified seismic load qualification
level.
QR-A6500 discusses an analytical method to seismically evaluate mechanical
equipment by applying seismic acceleration times the mass distribution of the
equipment plus operational load values. This application of forces is an
acceptable test method to evaluate the functional capability of mechanical
equipment under seismic and operational loading.
QV-B3000
DEFINITIONS
Refer to QR-A4000 for definitions of rigid equipment and flexible equipment.
QV-B4000 GENERAL REQUIREMENTS
(a) Static Side Load. Static side load testing shall be performed on the QME-1
qualified valve assembly under the seismic load to which the valve assembly is
to be qualified. The adequacy of qualification testing performed under this
nonmandatory appendix shall be evaluated where differential pressure cannot
be maintained sufficiently to simulate the full range of design-basis conditions
for which the valve/actuator assembly is being qualified.
(b) Magnitude and Location of Applied Seismic Load. The magnitude of the
seismic loading is determined to simulate the effect of the specified triaxial
acceleration g-levels for which the valve assembly is to be qualified. A single
axial force, concentrated at the center of gravity of the valve extended structure
and applied along the least rigid axis (unless a more critical axis can be
determined), may simulate specific seismic g-loads. If desired, increased seismic
g-levels may be used to extend the seismic qualification to similar constructions.
(1) The first step in calculating the seismic test load force, Ft, is to convert
the triaxial acceleration g-level components, acting on the valve assembly, into a
single resultant axial acceleration g-level by using the square- root-sum-ofsquares (SRSS) method. This single axial g-level is then multiplied by the weight
of the valve assembly extended structure to obtain a qualification load force, Fq.
This qualification load force may need to be further adjusted to compensate for
the effects of gravity on the test valve assembly, depending upon the orientation
of the valve assembly during the test and minor adjustment of the location of the
test load force to assure contact with a structural member. Regardless of the
location, the load must still create an equivalent moment in the most highly
stressed location of the extended structure.
(2) The test load force, Ft, is determined to ensure adequate margin to
account for any dimensional or material tolerance differences between the test
valve assembly and any production valve assemblies. Unless a different factor is
justified to account for material and dimensional tolerances, the following
relationship should be used to determine the test load force:
Ft AFq
where
A = multiplication factor, dimensionless
= 1.10 (test margin) if the valve assembly is determined to be rigid
= 1.65 (amplitude coefficient of 1.5 plus test margin) if the test valve
assembly is determined to be flexible
Fq = required qualification load force, lbf (N)
Ft = test load force, lbf (N)
(3) The magnitude of the load calculated above may need to be further
adjusted if the load cannot be applied in a practicable location on the equipment.
The single axial force should be located as close to the actual center of gravity as
practicable and as safe as possible. Regardless of the location, the load must still
create an equivalent moment in the most highly stressed location of the extended
structure.
(c) Test Pressure, psig (kPag)
(1) For QV Category A and B power-actuated valve assemblies per QME-1,
QV-7450, the test operating pressure shall be the design pressure rating, but no
greater than the 100°F (38°C) cold-working pressure rating for the valve
assembly being qualified. The test operating pressure shall be greater than that
for which the test valve assembly is to be qualified by a factor equal to the ratio
of the actual test bar yield strength of the tested body material divided by the
specified minimum yield strength of the body material, but no greater than 1.5
times the 100°F (38°C) cold-working pressure rating.
(2) For QV Category B relief valve assemblies per QME-1, QV-7650, thermal
stabilization of the valve shall be achieved per the valve functional specification
requirements.
(3)
(d) Test Differential Pressure, psig (kPag). The test differential pressure shall be
the pressure differential maintained across the valve disc during the opening
stroke. The value of the differential test pressure shall be deter- mined by
valve/actuator margin analysis calculations. The test differential pressure is not
considered a rating value for the actuator or valve, but creates a repeatable test
condition for diagnostic data comparison.
(e) All essential-to-function accessories shall be attached to the valve assembly
to satisfy the rigidity requirements of QME-1, QV-7450(b) or QV-7650(b). The
essential-to-function accessories that have not been previously qualified in
accordance with IEEE Std 344 as part of the actuator assembly shall be
seismically qualified by test in accordance with the test section of IEEE Std 344
per QV-7450(b) or QV-7650(b).
(f) Testing will be performed at normal room temperature, not to exceed 100°F
(38°C).
QV-5000
TEST METHOD
(a) QV Category A and B Power-Operated Valve Assemblies
(1) The valve assembly shall be installed in a test fixture with suitable
provision for imposing the static test load, and such that the valve assembly is
mounted by its normal mounting points (usually the valve body ends). The valve
mounting shall be sufficiently rigid to resist the applied seismic load and ensure
that the load force remains essentially perpendicular to the centerline of the
valve extended structure. The test load force, Ft, shall be applied as described in
QV-B4000(b)(1) above.
(2) The seismic functionality test shall be made starting with one full operating
cycle utilizing normal motive power. With the valve fully open, the valve body is
maintained at the designated test pressure [as defined in QV-B4000(c) above] and
valve closure is initiated. Following valve closure, establish the test differential
pressure [as defined in QV-B4000(d) above] in the specified flow direction (or in
the most adverse direction for bidirectional valves). Valve opening is then
initiated. Differential pressure need not be maintained after the test valve
assembly is unseated. Thrust (and/or torque), diagnostic data, and stroke time
measurements in both directions are to be recorded to establish baseline
measurements. For guidance, see QME-1, Section QV-G, Guide to Section QV:
Determination of Valve Assembly Performance Characteristics.
(3) With the valve in the open position, test operating pressure [as defined in
QV-B4000(c) above] shall be established in the valve, and (while pressure is
maintained) the test load force, Ft, shall be applied as specified in QV-B4000(b)(2)
above. Deflection measurements of the extended structure are to be recorded.
(4) While maintaining the test load force, Ft, a seismic functionality test shall
be performed in accordance with QV-B5000(a)(5) and QV-B5000(a)(6 ) below.
(5) Three or more full operating cycles shall be performed with the test valve
depressurized and utilizing the maxi- mum motive power for actuation. Data,
similar to QV-B5000(a)(2) above, shall be taken for comparison to the baseline
measurements.
(6) Three or more full operating cycles shall be performed utilizing minimum
motive power. With the valve fully open, the valve is pressurized at the
designated test pressure, and valve closure shall be initiated and timed.
Following valve closure, establish the test differential pressure in the specified
flow direction (or in the most adverse direction for bidirectional valves). Valve
opening is then initiated. Differential pressure need not be maintained after the
test valve assembly is unseated. Data, similar to QV-B5000(a)(2) above, shall be
taken for comparison to the baseline measurements.
(7) With the valve in the open position, remove the test load force, Ft, and
record deflection measurements of the extended structure.
(8) Repeating test QV-B5000(a)(2) above, finish testing with one full operating
cycle utilizing normal motive power. With the valve fully open, the valve body is
maintained at the designated test pressure [as defined in QV-B4000(c) above] and
valve closure is initiated. Following valve closure, establish the test differential
pressure [as defined in QV-B4000(d) above] in the specified flow direction (or in
the most adverse direction for bidirectional valves). Valve opening is then
initiated. Differential pressure need not be maintained after the test valve
assembly is unseated. Data, similar to QV-B5000(a)(2) above, shall be taken for
comparison to the baseline measurements.
(b) QV Category B Relief Valve Assemblies
(1) The relief valve assembly shall be installed in a test header with
suitable provision for imposing the static test load, and such that the valve
assembly is mounted by its normal mounting points (usually the valve body
ends). The valve mounting shall be sufficiently rigid to resist the applied seismic
load and ensure that the load force remains essentially perpendicular to the
centerline of the valve extended structure. The test load force, Ft, shall be applied
as described in QV-B4000(b)(1) above.
(2) Thermally stabilize the relief valve at a temperature condition that will
be used for the remainder of the testing.
(3) Perform three or more full lift tests by increasing the inlet pressure to
the point at which full lift is achieved. Record the setpoint, accumulation and
blowdown results for each run. A minimum of 10 min between test runs is
required to return the valve to the stabilization temperature specified in QVB5000(b)(2) above. These strokes are the baseline data for the valve and are to be
performed after all adjustments of the valve are completed.
(4) Assure that the pressure upstream of the valve is less than 90% of set
pressure and apply the test load force, Ft, as specified in QV-B4000(b)(2) above.
Record deflection measurements of the extended structure.
(5) Perform three or more full lift tests by increasing the inlet pressure to
the point at which full lift is achieved. Record the setpoint, accumulation and
blowdown results for each run. A minimum of 10 minutes between test runs is
required to return the valve to the stabilization temperature specified in QVB5000(b)(2) above. No adjustment of the valve is to be performed during this
testing. If the valve requires adjustment, testing is to restart with baseline testing.
(6) Remove test load force, Ft. Record deflection measurements of the
extended structure.
(7) Perform three or more full lift tests by increasing the inlet pressure to
the point at which full lift is achieved. Record the setpoint, accumulation and
blowdown results for each run. A minimum of 10 minutes between test runs is
required to return the valve to the stabilization temperature specified in QVB5000(b)(2) above. No adjustment of the valve is to be performed during this
testing. If the valve requires adjustment, testing is to restart with baseline testing.
(c) Pyrotechnic Valve Assemblies
QV-B6000
EVALUATION OF RESULTS
(a) Evaluate the deflection data and compare to data predicted by analysis.
(b) Evaluate the capability of the test to simulate the full range of normal,
abnormal, and design-basis operating conditions for which the valve/actuator
assembly is being qualified to justify the seismic functional qualification of the
valve/actuator assembly.
(c) For power-operated valves, validate that the thrust (and/or torque),
diagnostic data, and stroke time measurements provide indication that the
seismic loading does not impair the ability of the actuator to stroke the valve.
(d) For relief valves, validate that the lift data provides indication that the
seismic loading does not impair the ability of the relief valve to function
correctly.
(e) For pyrotechnic valves…
QV-B7000
VALVES
EXTRAPOLATION OF RESULTS FOR POWER OPERATED
(a) Test data of a specific size valve and actuator is directly applicable to
valves and actuators of the same size and type. (See QV-7462 as applicable.)
(b) Analysis methods may be used to show that test data for a specific size
actuator is applicable when the same size actuator is mounted in a similar
manner to a larger size valve or to a valve of a greater pressure class.