Download NEIL Requirements for Testing of FWH electrical Equipment

NEIL Requirements for Testing of
FWH Electrical Equipment and
AOV’s
Purpose
• 2007 - STP self-identified nonrelated NEIL issue
•
•
that resulted in repeat failure of a critical SSC.
NEIL inspection coming up  comprehensive
review of all requirements  found this FWH
equipment issue
Communicate NEIL requirements regarding FWH
electrical equipment/AOV testing
– NEIL has spent beaucoup dinero on DC Cook event
– Have shifted focus to protecting large assets (i.e.
Main Turbine)
– OE31559 – Reference Nine Mile Point OE
Requirements
Feedwater Heater Alarms and Interlocks
·
Perform observation/Test/ Inspection/Surveillance of Integrity
of Electrical Circuits/Heaters. Should ‘NA’, Shall 1 Fuel Cycle LCS
2.2.5.3.2 - 2 (TG/Exciter – Operating Test)
·
Operating and testing to be conducted: Integrity of electrical
circuitry and power supply for heater extreme high level alarms,
controls, switches and interlocks by testing. Should – ‘NA’, Shall – ‘1
fuel cycle’
LCS Section 2.2.5.3.2 - 2
Feedwater Heater Level Control Valves
·
Perform observation/Test/ Inspection/Surveillance of Integrity
of Electrical Circuits/ Valves. Should ‘NA’, Shall 1 Fuel Cycle LCS
2.2.5.3.2 -3 (TG/Exciter – Operating Test)
·
Operating and testing to be conducted: Integrity of electrical
circuitry and power supply of all remote operated heater drain and
bypass valves by testing. Should – ‘NA’, Shall – ‘1 fuel cycle’
LCS
Section 2.2.5.3.2 - 3
Typical Heater Drain System
• Normal Level Control Valve
• High Level Dump
• May be digital or Analogue
Typical Heater Steam Side Isolation
• Level Switches that:
• Shut off Extraction Steam
• Shut off previous FWH flow
• Shut off Blowdown flow
Typical Tube Side Isolation System
• Level Switches that:
• Shut off Condensate flow
• Open Condensate Bypass
• Shut off other sources of flow into heater
Considerations for Testing
• RHDT’s / MSDT’s / Deaerator switches/AOV’s are not
•
•
•
•
•
•
applicable
Alarms are not applicable (per our NEIL rep, though you
should ask your rep specifically)
Should be done at beginning of outages to identify scope
You can take credit for SU/SD actuation, PM, or
corrective PMT (monitor voltage at the contacts for large
MOV’s)
Don’t have to test all equipment at the same time
No requirement to fill level switch standpipes
Ops controlled procedure is the easiest way
Discussion
• NEIL standards are governed by
representatives from each plant
• If a standard is too restrictive or is not
effective, the board can change it
• What is your plant’s strategy?
• What do you think?