ML20133J361
| ML20133J361 | |
| Person / Time | |
|---|---|
| Site: | Nine Mile Point  |
| Issue date: | 09/30/1985 |
| From: | Mangan C NIAGARA MOHAWK POWER CORP. |
| To: | Starostecki R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| (55(E)85-27), (NMP2L-0500), (NMP2L-500), NUDOCS 8510180395 | |
| Download: ML20133J361 (2) | |
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l M V NIAGARA l
MUMOHAWK l
NIAGARA MOHAWK POWER CORPORATION /300 ERIE BOULEVARD WEST, SYRACUSE, N Y 13202/ TELEPHONE (315) 474 1511 September 30, 1985 (NMP2L 0500)
Mr. R. W. Starostecki, Director U.S. Nuclear Regulatory Comission Region I Division of Reactor Projects 631 Park Avenue King of Prussia, PA 19406
Dear Mr. Starostecki:
Enclosed is an interim report in accordance with 10CFR50.55(e) for the problem generator unsuccessful starting during preliminary concerning standby diesel This problem was reported via tel-con to L. Doerflein of your staff testing.
on September 4,1985 Very truly yours, C. V. Mangan Senior Vice President CVM/GG/cla (1240H)
Director of Inspection and Enforcement xc:
U.S. Nuclear Regulatory Commission Washington, DC 20555 R. A. Gram, NRC Senior Resident Inspector Project File (2) 8510180395B[go$go ADOCK O PDR
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NIAGARA MOHAWK POWER CORPORATION NINE MILE POINT - UNIT 2 DOCKET NO. 50-410 Interim Report for a Problem Concerning Standby Diesel Generator Unsuccessful Starting During Preliminary Testing (55(e)85-27) 1 Description of the Problem During preliminary testing a system anomaly was observed wherein the Division II standby diesel generator failed to start when given an emergency start signal.
This was due to the circuit's engine speed sensing relay picking up a false speed indication through its 125 V de control power source.
The 125 V de power supply was apparently receiving " noise" from the Division II uninterruptable power supply, which receives : ;3 125 V de power from a comon source under loss of offsite power and during testing of the uninterruptable power supply circuits.
This " noise" was interpreted as engine speed by the two speed sensing relays and the start permissive for the engine was already disabled when the emergency start signal was given.
The matter is still being investigated and a final report will be submitted by November 4, 1985.
This problem also pertains to the identical Division I standby diesel 4
j generator.
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