ML19257D598
| ML19257D598 | |
| Person / Time | |
|---|---|
| Site: | Big Rock Point File:Consumers Energy icon.png |
| Issue date: | 01/18/1980 |
| From: | Fields H CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| IEB-80-01, IEB-80-1, NUDOCS 8002050143 | |
| Download: ML19257D598 (3) | |
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Gene <al Offices: 212 West Michigan Avenue, Jackson, Michigan 49201 Area Code 517788-05S0 January 18, 1980 Mr James G Keppler Office of Inspection and Enforcement Region III US Nuclear Regulatory Commission 79! Roosevelt Road Gle-Ellyn, IL 60137 DOCIC 50-155 - LICENSE DPR BIG ROCK POINT PLANT -
CONSL?!ERS POWER COMPANY RESPONSE TO IE BULLETIN 80-01:
OPERABILITY OF ADS VALVE PNELTIATIC SUPPLY Attached, please find Consumers Power Company's response to IE Bulletin 80-01 (Operability of ADS Valve Pneumatic Supply).
The Reactor Depressurization System (RDS) at Big Rock Point Plant, comparable to performing the ADS function in this bulletin, does not require a pneumatic source to operate.
The RDS does, however, have a pneumatically operated isolation valve (air required to close) to provide isolation in the event of a spurious opening of the solenoid operated (Target Rock) relief valve. A sketch of the Big Rock Point System is shown in Figure 1.
Even though this bulletin is not applicable to Big Rock Point due to the differences in design philosophy, the actions to be taken address the use of pneumatic operators of which Big Rock Point utilizes in their RDS.
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s Item 1: Dete mine if your facility has installed hardseat check valves to iso? ate the ADS accumulator system from the pneumatic supply system.
Response
An ADS accumulator is not used at Big Rock Point.
The check valves utilized for isolation in the pneumatic supply are "in-line" type with resilient (Viton) 0-ring seating surfaces.
Item 2: Determine if periodic leak tests have been performed on your ADS accumulator systems to assure emergency pneumatic supply for the FSAR-required number and duration of valve operations.
Response: The RDS isolation valves at Big Rock Point open on loss of air supply to provide the blowdown function; multiple operations are not required.
Item 3: Review seismic qualifications of the ADS pneumatic supply system:
From accumulator system isolation check valve to ADS valve a.
operator.
b.
From isolation valve outside containment up to ADS accumulator check valve.
Response: The instrument air system at Big Rock Point is not classed as safety-related; consequently, seismic criteria is not applied.
Fail-safe philosophy pr'vails on all engineered safeguards systems utilizing instrument air.
Item 4: Based upon determination of Items 1, 2 and 3 above, evaluate operability of the ADS for the conditions under which it is required to be operable including a seismic event.
If operability cannot be established, adhere to appropriate Technical Specification statement.
Response: The instrument air system at Big Rock Point need not be operable for the RDS to perform its design function, namely, reactor blowdown for small break LOCA.
The isolation valve guards against reactor blowdown if the RDS valve inadvertently opens; the RDS valve guards against reactcr blowdown if the isolation valve inadvertently opens (ie, loss of air between isolation valve and check valve).
During accident conditions, both valves receive electrical signals to initiate their intended function; air pressure is not required.
Item 5:
Provide an immediate notification to the NRC in the event the ADS is found to be inoperable.
Response: Not applicable; operability of the RDS is satisfied.
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