05000293/LER-1983-013, Forwards LER 83-013/01T-0.Detailed Event Analysis Encl

Forwards LER 83-013/01T-0.Detailed Event Analysis Encl

ML20073P153
Person / Time
Site:	Pilgrim
Issue date:	04/13/1983
From:	Harrington W BOSTON EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20073P155	List: 05000293/LER-1983-013, Forwards LER 83-013/01T-0.Detailed Event Analysis Encl
References
83-89, NUDOCS 8304250043
Download: ML20073P153 (2)

LER-2083-013, Forwards LER 83-013/01T-0.Detailed Event Analysis Encl

Event date:
Report date:
2932083013R00 - NRC Website

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• - EOSTON EDISON COMPANY B00 BOYLETON STREET 50sTON, MASSACHUBETTs 02199 WILLIAM O. HARRENGTON 01mson viss enseissue es % Laan April 13,1983 BECo Ltr. 83-89 Regional Administrator, Region i U. S. Nuclear Regulatory Commission 631 Park Avenue King of Prussia, PA 19406 Docket Number 50-293 License DPR-35

Dear Sir:

The attached Licensee Event Report 83-013/0lT " Field Breaker for "B" Recirculation Pump MG Set" is hereby submitted in accordance with the requirements of Pilgrim Nuclear Power Station Technical Specification 6.9.B.l.i.

If there are any questions on this subject, please contact us.

Respectfully submitted, l

W. D. Harrington Senior Vice President Nuclear GGW:dmp

Enclosure:

LER 83-013/01T-0 cc: Document Control Desk U. S. Nuclear Regulatory Commission Washington, D. C. 20555 Standard BECo LER Distribution 8304250043 830413 PDR ADDCK 05000293 O

S PDR y/

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BOSTON EDISON COMPANY PILGRIM NUCLEAR POWER STATION DOCKET NO. 50-293 Attachment to LER 83-013/01T-0 Cause and Corrective Action:

When investigated the breaker was found as follows:

1. The main contacts were partially tripped and bound up indicating that a trip signal had been sent to the breaker.

2. The shunt trip device had a failed trip coil and the mechanism was partially in trip.

3. The breaker would not mechanically trip via the mechanical push button.

Immediate Corrective Action Taken:

1. The breaker was removed from the cubicle, arc chutes removed, and the trip latch mechanism manually pushed. Phase one, two and three then tripped.

2. The main and shunt trip linkage was lubricated with "LPS" penetrating oil ( a non-greasy lubricant). The breaker was cycled approximately twenty times and then reinstalled.

3. Applicable sections of the Technical Manual were consulted and specified actions taken.

4. The redundant "A" M/G set breaker was operated and no signs of similar binding were found.

5. An ORC meeting was held to review the event. While no root cause could be determined at that time, the ORC agreed that proper immediate corrective action had been taken and sufficient testing of the breaker operations had been done. Reactor startup then continued and the plant was critical on 4/3/83.

6. The General Electric Company has been contacted to assist in the resolution of the problem.

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