ML20132A784
| ML20132A784 | |
| Person / Time | |
|---|---|
| Site: | Nine Mile Point  |
| Issue date: | 09/09/1985 |
| From: | Mangan C NIAGARA MOHAWK POWER CORP. |
| To: | Starostecki R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| (NMP2L-0487), (NMP2L-487), NUDOCS 8509260009 | |
| Download: ML20132A784 (2) | |
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M Y NIAGARA RuMOHAWK NIAGARA MOHAWK POWER CORPORATION /300 ERIE BOULEVARD WEST. SYRACUSE N Y.13202/ TELEPHONE (315) 474-151' Scptember 9, 1985 (NMP2L 0487)
Mr. R. W. Starostecki, Director U.S. Nuclear Regulatory Comission Region I Division of Reactor Projects 631 Park Avenue King of Prussia, PA 19406 Re: Nine Mile Point - Unit 2 Docket No. 50-410
Dear Mr. Starostecki:
Attached is a final report concerning problems identified previously with respect to the post-LOCA hydrogen recombiners.
This report addresses three deficiency reports which were previously reported as a result of failure to meet the requirements of the qualification program.
Very truly yours, DMd/LjM C. V. Mangbri Senior Vice President CVM/GG/cla (1224H) xc: Director of Inspecticn and Enforcement U.S. Nuclear Regulatory Commission Washington, DC 20555 R. A. Gram, NRC Senior Resident Inspec tor Project File (2)
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NIAGARA M0 HAWK POWER CORPORATION NINE MILE POINT - UNIT 2 DOCKET NO. 50-410 4
Final Report For Problems With The Post-LOCA Hydrogen Recombiners Description of the Problem This report addresses the problems concerning the post-LOCA hydrogen recombiners manufactured by Rockwell International.
The initial problems concerning the pressure transducer and disconnect switch were reported to the Nuclear Regulatory Comission by Niagara Mohawk on November 19, 1982, and a final report was submitted on February 11,1983, (two corrective action items are still open).
On March 28, 1983, Niagara Mohawk reported a problem to the j
Nuclear Regulatory Comission concerning ITE Imperial circuit breakers and submitted interim reports on April 26 and August 9,1983.
On August 11, 1983, Niagara Mohawk reported a problem concerning the microswitch and submitted an interim report on September 1,1983.
Also mentioned in this interim report i
was the fact that the problem with the circuit breakers and the microswitch would be combined in one final report and submitted to the Nuclear Regulatory i
j Comission by September 9,1985.
I Analysis of Safety Implications All deficiencies identified in the above referenced reports! were detected as a result of the components failure to meet the requirements of the IEEE-323 qualification test program.
Although no detailed analysis was performed, it was assumed that failure of any one of the components in question could have resulted in the failure of the recombiner to perform its safety function.
i Therefore, had these conditions gone uncorrected, it could have adversely affected the safety of operations of the plant.
Corrective Action Due to extensive redesign of the recombiner power cabinets and change in one supplier, the identified deficiencies no longer exist.
The ITT Barton pressure transducer will be replaced with Gould pressure transducers.
The ITE Imperial circuit breakers have been replaced by fuses.
The disconnect switch and microswitch have been deleted by redesigning the circuits.
The modified equipment is undergoing qualification testing.
Successful completion of this testing will verify the adequacy of the redesign.
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