ML19254D732
| ML19254D732 | |
| Person / Time | |
|---|---|
| Site: | Big Rock Point File:Consumers Energy icon.png |
| Issue date: | 10/16/1979 |
| From: | Ziemann D Office of Nuclear Reactor Regulation |
| To: | Bixel D CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| Shared Package | |
| ML19254D733 | List: |
| References | |
| TASK-06-04, TASK-6-4, TASK-RR NUDOCS 7910300021 | |
| Download: ML19254D732 (3) | |
Text
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p* **cua f1 UNITED STATES y y v,
i NUCLEAR REGULATORY COMMISSION E
WASHINGTON, D. C. 20555 5
o o tober 16, 1979
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Docket No. 50-155 Mr. David Bixel Nuclear Licensing Administrator Consumers Power Company 212 West Michigan Avenue Jackson, Michigan 49201
Dear Mr. Bixel:
We are continuing our review of your November 29, 1978 sutmittal related to fuel handling accidents in containment and your December 28, 1978 sutmittal related to containment purging for the Big Rock Point plant and have found that the additional information described in the enclosure to this letter is needed. We request your response within 45 days of the date of this letter.
A generic evaluation of containment purge system electrical design has established certain evaluation criteria. A copy of these _riteria are a.ttached for your infomation.
Sincerely, A
.s s t-. tW e y>,. h.,WA.L
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Dennis L. Ziemann; Chief Operating Reactors B'.anch.f2 Division of Operating Reactors
Enclosure:
1.
Request for Additional Information 2.
Criteria for Evaluation of Containment Purge System Electrical Design cc w/ enclosures:
See next page n n b l b 't 7910300 67_.L
Mr. David Bixel October 16, 1979 cc w/ enclosures:
Mr. Paul A. Perry, Secretary Consumer: Power Company 212 West Michigan Avenue Jackson, Michigan 49201 Judd L. Bacon, Esquire Consumers Power Company 212 West Michigan Avenue Jackson, Michigan 49201 Hunton & Williams George C. Freeman, Jr., Esquire P. O. Boy 1535 Richmond, Virginia 232i2 Peter W. Steketee, E' squire 505 Peoples Building Grand Rapids, Michigan 49503 Charlevoix Public Library 107 Clinton Street Charlevoix, Michigan 49720 Sheldon, Harmon. Roisman and Weiss 1725 I Street, N. W.
Suite 506 Wa shington, D. C.
20006 Mr. John O'Neill, II Route 2, Box 44 Maple City, Michigan 49664 O
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ENCLOSURE 1 REQUEST FOR ADDITIONAL INFORMATION BIG ROCK POINT PLANT CONTAINMENT PURGE SYSTEN DOCKET NO. 50-155 1.
In your sutmittal on " additional information relative to fuel handling accident in containment" dated November 29, 1978, you recognized some single failures in electrical design.
In addition, because of automatic vactum relief system circuits being integrated into the containrent isolation system, there are several other single failures in the vacuum relief system that could block an isolation signal. A technical evaluation report was prepared by our consultant, EC&G Idaho, Inc.,
on Big Rock Point plant containment isolation system (CIS). The report has concluded that the lack of redundancy and independence in the air supply and exhaust portion of the contairment isolation system and its integrated vacuum relief system, leaves the CIS open to numerous disabling single failures. The staff has reviewed this report and concur in its conclusions.
A copy of EG&G Report No. RE-A-79-045 is attached. You are requested to address each single failure postulated in the report and provide a justification and/or proposed modification to the CIS.
2.
There is only one manual control switch (HS-9001) to close both air supply valves and both exhaust valves.
In July 16,1973, I&E Bulletin No 73-2 required all licensees to take action to determine whether the failure of a single control switch could result in the simultaneous failure of the redundant supply valves or redundant exhaust valves.
You are requested to address your response to this bulletin.
Attachment:
EG&G Report No. RE-A-79-045 M
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