ML20054E847
| ML20054E847 | |
| Person / Time | |
|---|---|
| Site: | Cooper  |
| Issue date: | 06/07/1982 |
| From: | Vassallo D Office of Nuclear Reactor Regulation |
| To: | Pilant J NEBRASKA PUBLIC POWER DISTRICT |
| Shared Package | |
| ML20054E848 | List: |
| References | |
| NUDOCS 8206140338 | |
| Download: ML20054E847 (3) | |
Text
DISTRIBUIION Oc&-o/L C nnck6t Fii D.
3 NRC PDR JUN 0 71982 Local RDG ORB #2Rdg D. Eisenhut OELD OI&E (1)
Docket No. 50-298 B. Sicgel S. Norris D. Brinkman NSIC ACRS (10)
J. Heltemes Mr. J. M. P11 ant, Director T. Alexion Licensing & Quality Assurance D. Verrielli Nebraska Public Power District E. Reeves P. O. Box 499 Columbus, Nebraska 68601
Dear Mr. Pflant:
SUBJECT:
CONTAINMENTPURGEANDVENT(MULTI-PLANTACTIONITEMB-24).
OVERRIDE OF CONTAINMEllT PURGE INSOLATION RE:
Cooper Nuclear Station Our letter of October 26, 1981 addressed the status of Multi-Plant Action Item B-24 related to Containment Purge and Vent and identified the four components of the purge and vent review. One of the components of this review, Safety Action Signal Override, was identified as under review.
Since then we have completed our review of this aspect of Multi-Plant Action Item B-24.
Enclosure No.1 contains our safety evaluation for Cooper Nuclear Station which was based on our review of the technical evaluation performed by EG & G.
A copy of the technical evaluation report (EGG 1183-4149) dated June 1980 is also enclosed (enclosure 2).
We find the electrical, instrumentation and control design aspects of the override of containment purge valve isolation and other engineering safety feature signals for the Cooper Nuclear Station to be acceptable. The issuance of this safety evaluation completes this component of Multi-Plant Action Item B-24.
Sincerely, origind signg 3, Domenic B. Vassallo, Chief Operating Reactors Branch #2 Division of Licensing Enclosures As Stated cc w/ enclosures See next page 8206140338 820607 PDR ADOCK 05000298
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Nebraska Public Power District P. O. Box 499 Columbus, Nebraska 68601 Mr. A-thur C. Gehr, Attorney Snell & Wilmer 3100 Valley Center Phoenix, Arizona 85073
. Cooper Nuclear Station ATTN:
Mr. L. Lessor Station Superintendent' P. O. Box 98 Brownville, Nebraska 68321 I
Auburn Public Library 118 - 15th Street Auburn, Nebraska 68305 Mr. Dennis Dubois USNRC Resident Inspector P.O. Box 218 Brownville, NE 68321 John T. Collins R.egional Administrator, Region IV U.S. Nuclear Regulatory Commission 611 Ryan Plaza Drive, Suite 1000 Arlington, Texas 76011 O
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ENCLOSURE I r
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SAFETY EVALUATION COOPER NUCLEAR POWER STATION OVERRIDE OF CONTAINMENT PURGE ISOLATION
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Introduction f nstances have been reported at nuclear power plants where the intended automatic closure of the containment purge / ventilation valves during a postulated accident would not have occurred because the safety actuatien signals were inadvertently overriden and/or blocked, due to design deficiencies. These instances were determined to constitute an Abnormal Occurrence (#78-5). As a follow-up action, NRR issued a generic letter requesting each licensee to take certain actions.
Evaluation The enclosed report " Electrical, Instrumentation and Control Aspects of the Override of Containment purge Valve Isolation," (EGG 1183-4149)was prepared for us by EG&G, San Ramon as part of our technical assistance contract program. The report provides their technical evaluation of the design compliance with NRC provided criteria.
Conclusion Based on our review of the contractor's technical report, we conclude that the electrical, instrumentation and control design aspects of the override of containment purge valve isolation are acceptable.
This safety eyaluation was prepared by T. Alexion and J. Calvo of the Operating Reactors Assessment Branch.
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