ML20134H229
| ML20134H229 | |
| Person / Time | |
|---|---|
| Site: | Nine Mile Point  |
| Issue date: | 08/06/1985 |
| From: | Mangan C NIAGARA MOHAWK POWER CORP. |
| To: | Starostecki R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| (NMP2L-0462), (NMP2L-462), NUDOCS 8508280326 | |
| Download: ML20134H229 (2) | |
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.o Y NIAGARA NUMOHAWK NIAGARA MOHAWK POWER CORPORATION /300 ERIE BOULEVARD WEST. SYRACUSE, N.Y.13202/ TELEPHONE (315) 474-1511 August 6, 1985 (NMP2L 0462)
Mr. R. W. Starostecki, Director U.S. Nuclear. Regulatory Commission Region I Division of Reactor Projects 631 Park Avenue King of Prussia, PA 19406 I-Re:
Nine Mile Point - Unit 2 Docket No. 50-410
Dear Mr. Starostecki:
Enclosed -is - a final report in accordance with 10CRF50.55(e) for the problem concerning the standby diesel generator vendor wiring drawing errors for the governor.
This problem was reported via telecon to T. Silko of your staff on July 3, 1985.
e Very truly yours, C. V. Mangan Senior Vice President CVM/GG/cla (1170H)
Enclosure xc: Director of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, DC 20555 R. A. Gramm, NRC Senior Resident Inspector Project File ge2%h p
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NIAGARA M0 HAWK POWER CORPORATION NINE MILE POINT - UNIT 2 DOCKET N0. 50-410 Final-Report for a Problem Concerning Standby Diesel Generator Wiring Drawing Errors for Governor (55(e)-85-?3)
Description of-the Problem During a review of the Division I Standby Diesel Generator 2EGS*EGl current transformer polarities,. it was discovered that vendor drawing _ (No. 5-253-199, Sh 1, File No. 0001.040-209-108, Cooper Energy Services) contained an error concerning the current transformer wiring to the engine electronic governor.
.The neutral-leg of the ' Phase B and C transformers were-transposed on this drawing.
Field cables to the electronic governor were installed in accordance with this vendor drawing.
This error also applies to the -Division II Standby Diesel Generator 2EGS*EG3 which was also supplied by Cooper Energy Services.
Analysis of Safety Implications
' The effect of this error would have been to render the electronic load sensing capabilities of the governor on both Division I and II diesel generators
-inoperative.
Since these current _ transformer circuits are connected to an electron'ic adder within the governor, it is possible that the transposed phase neutrals would have led to immediate damage to the governor upon initial energization.
Loss of the governor would leave the diesel generator inoperative.- Therefore, if this condition were to have remained uncorrected,
- it could have adversely affected the safety of operations of the plant.
Corrective Action The drawing will be revised to indicate the correct wiring circuit.
This action is documented on Engineering and Design Coordination Report No. C45542A.
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