ML20023D764
| ML20023D764 | |
| Person / Time | |
|---|---|
| Site: | FitzPatrick  |
| Issue date: | 05/18/1983 |
| From: | Heltemes C NRC OFFICE FOR ANALYSIS & EVALUATION OF OPERATIONAL DATA (AEOD) |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20023D765 | List: |
| References | |
| AEOD-E312, NUDOCS 8306030270 | |
| Download: ML20023D764 (1) | |
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UNITED STATES
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HiMORANDUM FOR: Harold R. Denton, Director s
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Office of Nuclear Reactor Regulation
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C. J. Heltemes, Jr., Director s,~
Office for Analysis and Evaluation y
of Operational Data
SUBJECT:
OPERABILITY OF TARGET ROCK SRVs'IN THE SAFETY MODE WITH PILOT YALVE LEAKAGE l
1 Enclosed is an Engineering Evaluation Report on the above subject recently completed by this office. Our evaluation concludes that pilot valve leak rates above 200 pounds per hour may challenge operability of Target Rock two-stage 1
safety / relief valves (SRVs) in the safety mode. We recommend that current NRR activities related to the BWR Owners Group setpoint drift program for two-stage SRVs be expanded to determine whether high pilot valve leak rates can, in fact, challenge SRV operability in the safety mode.
If this challenge is confirmed,.
we further recommend that appropriate regulatory guidance be_ provided to affect-ed BWR licensees. This guidance should contain the maximum allowable leakage ratei, the acceptable detection methods, and the minimum surveillance require-ments.
It should be noted tha$ the Pilgrim 1 plant already includes technical specifi-I cation requirements in these areas.
If your review should show the need for technical spec;fication requirements for other licensees using two-stage Target Rock SRVs, allWicensees, including Pilgrim, should be required to incorporate the same requirements since no technical basis for differences is apparent.
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C. J. Heltemes, Jr. DTrector Office for Analysis and Evaluation of Operational Data cc:
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