ML20090E345

Final Part 21/Deficiency Rept 84-19 Re Isulation Damage in Reels of Rockbestos multi-conductor Cable.Initially Reported on 840608.Reels Returned to Vendor

ML20090E345
Person / Time
Site:	Nine Mile Point
Issue date:	07/06/1984
From:	Lempges T NIAGARA MOHAWK POWER CORP.
To:	Starostecki R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
REF-PT21-84-335-000 84-19, NMP2L-0104, NMP2L-104, PT21-84-335, PT21-84-335-000, NUDOCS 8407190406
Download: ML20090E345 (2)

Text

- - _ - _ _ _ _ _ _

^

M Y NIAGARA RUMOHAWK NIAGARA MOHAWK POWER CORPORATION /300 ERIE BOULEVARD WEST, SYRACUSE, N Y.13202/ TELEPHONE (315) 4741511 July 6, 1984 )

(NMP2L 0104)

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 cable (55(e )-84-19) insulation damage

. This in certain problem reels of Rockbestos was reported via telecon multi-conductor to Mr. S. Collins of your staff on June 8,1984.

Sincerely, T. . Lemp es M

Vice President Nuclear Generation TEL/TRL:djm Enclosoure xc: Director of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, D.C. 20555 Mr. R. Gramm (NRC Resident) kD 0 S

\

p G. s f

E NIAGARA M0 HAWK POWER CORPORATION NINE MILE POINT UNIT 2 DOCKET N0. 560-410 Final Report for a Problem Concerning Damage to Insulation of Rockbestos Cable (55(e) 19)

Description of the Problem-The problem concerns Class lE multi-conductor cable supplied by the Rockbestos Company. . The manufacturer reported the problem to the Nuclear Regulatory Commission under 10CFR21, via letter dated May 11, 1984 (copy enclosed). As stated in this report the damage to the cable insulation was caused during the process of reworking outer jackets and the damage was confined to work performed by one operator. The vendor has identified 12 reels, supplied to Nine Mile Point Unit 2, tnat may have the damaged cable segments.

Analysis of Safety Implications The vendor has indicated in its 10CFR21 notification, that there is a possibility of failure of the cable in question to operate in an accident environment. Tne failure of a Class IE cable could result in the loss of a safety related circuit. Therefore, if this problem were to have remained uncorrected, it could have adversely affected _the safety of operations of the plant.

Corrective Action

1. Cable from eight suspect reels has not been used. These reels will be returned to the Seller.

2. The installed suspect cable with jacket rework will be removed from safety related circuits.

These corrective actions will be completed by October 25, 1984. y L ,

=E n;

m .a l

l

.