ML20101B619
| ML20101B619 | |
| Person / Time | |
|---|---|
| Site: | Nine Mile Point  |
| Issue date: | 11/30/1984 |
| From: | Mangan C NIAGARA MOHAWK POWER CORP. |
| To: | Starostecki R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| (55(E)-84-31), (NMP2L-0266), (NMP2L-266), NUDOCS 8412200407 | |
| Download: ML20101B619 (3) | |
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... .y Y NIAGARA NUMOHAWK NIAGARA MOHAWK POWER CORPORATION /300 ERIE BOULEVARD WEST. SYRACUSE. N.Y.13202/ TELEPHONE (315) 474-1511
.l November 30, 1984 (NMP2L 0266)
Mr. R. W. Starostecki, Director U. S. Nuclear Regulatory Commission Region I Division of Project and Resident Programs 631 Park Avenue King of Prussia, PA 19406 Re: Nine Mile Point - Unit 2 Docket No. 50-410
Dear Mr. Starostecki:
Enclosed is a final report in accordance with 10CFR50.55(e) for the problem concerning wiring deficiencies in unit substation and switchgear. This problem was reported via tel-con to P. Russ of your staff on August 7,1984 An interim report was submitted via our letter dated September 6,1984.
Very truly yours, i C. V. Mangan
. Vice President
! Nuclear Engineering and Licensing CVM/GG/csb (0540H) xc: Director of Inspection and Enforcement '
U. S. Nuclear Regulatory Commission Washington, DC 20555 R. A. Gramm, NRC Resident Inspector Project File (2) 8412200407 841130 PDR ADOCK 05000410 g PDR t
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NIAGARA M0 HAWK POWER CORPORATION NINE MILE POINT - UNIT 2 DOCKET NO. 50-410 Final Report for a Problem Concerning Wiring Deficiencies in Unit Substation and Switchgear (55(e)-84-31 )
Description of the Problem An inspection of the wiring terminals for the unit substation and switchgear identified the following wiring deficiencies:
- 1. Strand damage, twisted lugs, and bad crimps
- 2. Insufficient wire projection and stressed connections
- 3. Excessive wire projection
- 4. Lugs bent up to 90 degrees The specific equipment affected are:
- 1. Supplied by Brown-Boveri Electric Incorporated
- a. Unit substation, Mark No. 2EJS*US3
- b. Switchgears, Mark Nos. 2EJS*US3
- 2. Supplied by General Electric Company Switchgear, Mark No. 2 ENS *SWG103 Analysis of Safety Implications The wiring deficiencies could have resulted in bad electrical connections. As a result, the subject safety-related unit substation and switchgear could have been prevented from performing their intended function, thus resulting in loss of power and/or control of certain safety-related systems (e.g., residual heat removal, spent fuel pool cooling, service water, etc. ). Therefore, if this ,
problem were to have remained uncorrected, it could have adversely affected the safety of operations of the plant.
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.o Corrective Action The following corrective action will be taken:
- 1. Strand Damage, Twisted Lugs, and Bad Crimps The existing lugs shall be removed up to the point of _ broken strand. The . wire -shall be reterminated in accordance with Specification E061A.
- 2. Insufficient Wire Projection and Stress Connections The old teminations shall'be cut off as required and the wire shall be reterminated in accordance with Specification E061 A. Cable ties shall be cut, as required, to provide sufficient slack. The wire shall be reconnected and supported as required.
- 3. Excessive Wire Projection If projection has the potential for coming in contact with adjacent teminals or edges of equipment, the excessive projection shall be trimed back to the correct distance and the wire shall be re-teminated in accordance with Specification E061 A. Cable ties shall be cut as required to provide sufficient slack. Wire shall be re-connected and supported as required.
4 Lugs Bent Up to 90 Degrees Lugs bent past 450 with no sign of stress cracking at the bend will be accepted-as-is.
Lugs bent past 450 with signs of stress or fatigue shall be re-moved, and the wire reteminated in accordance with Specification E061 A. Cable ties shall be cut as required to provide sufficient sl ack. Wire shall be reconnected and supported as required.
The corrective action is documented and will be completed in accordance with Nonconfomance and Disposition Report No. 9220 l
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