ML20052G454

Interim Deficiency Rept Re Possible Cracking of Lexan Coil Spools in HFA-type Relays.Relay Replacement Will Be Completed by 820831

ML20052G454
Person / Time
Site:	Shoreham File:Long Island Lighting Company icon.png
Issue date:	05/07/1982
From:	Milligan M LONG ISLAND LIGHTING CO.
To:	Haynes R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
10CFR-050.55E, 10CFR-50.55E, SNRC-694, NUDOCS 8205180374
Download: ML20052G454 (2)

Text

u )

dp FLd'O LONG ISLAND LIGHTING COM PANY

[Mardsmat SHOREHAM NUCLEAR POWER STATION P.O. BOX 618, NORTH COUNTRY ROAD e WADING RIVER, N.Y.11792 May 7, 1982 SNRC-694 Mr. Ronald C. Haynes Office of Inspection & Enforcement Region 1 U.S. Nuclear Regulatory Commission 631 Park Avenue King of Prussia, PA 19406 SHOREHAM NUCLEAR POWER STATION - UNIT 1 DOCKET NO. 50-322

Dear Mr. Haynes:

On April 7, 1982, in accordance with 10CFR50. 55 (e) , we reported verbally to Region 1 of a deficiency within HFA type "elays manufactured by General Electric Co. This letter serves as our 30-day written report on this deficiency and describes the corrective action to be taken.

Description of Deficiency In late 1980 we were advised by General Electric Co., Service Advice Letter 721-PSM-152.2 of a possible cracking of Lexan coil spools used in HFA type relays. General Electric Co. in-formed us that although they had not received any reports of broken coil spools interfering with the operation of HFA relays, they speculated that a cracked coil spool could result in a piece of broken coil spool preventing the desired contact action in response to energizing or de-energizing of the relay.

This SAL had been reviewed for reportability under 10CFR50.55 (e) and our analysis indicated that a misoperation of an HFA relay due to a cracked or broken coil spool would be highly unlikely because of the relative locations of the coil bobbins and the contact mechanism. Also, there had been no cases reported where debris from a broken coil had prevented an HFA relay operation.

8205180H 43 g iO

l s- .)

l May 7, 1982 Page Two

Mr. Ronald C. Haynes SNRC-694 The decision for non-reportability was further supported by evidence collected by an on-site survey. A G.E. inspection

, team examined the 338 HFA relays located on Shoreham's NSSS Control Boards. Of these 338 relays inspected, 29 were found to have broken coil spools and 17 had spools with cracks (total 46). The contact assembly in all 46 of the relays determined to have defective coil spools were free to operate and not obstructed by debris from the coil spool.

A subsequent survey of BOP HFA type relays verified the findings'of the NSSS relays. .

Subsequently, General Electric Co. issued a revised Service

Advice Letter, 721-PSM-152.2A, dated March 24, 1982, stating that they received a report of an incident where,a broken piece of Lexan coil spool prevented the desired operation of a relay.

As a result of this latter Service Advice Letter, it has been determined that this situation constitutes a reportable de-j ficiency under 10CFR50.55 (e) .

! Corrective Action s

l' Although our analysis indicated that the situation did not con-stitute a reportable defect, based on G.E. Service Advice Letter 721-PSM-152.2, we elected to replace all Cat lE HFA relay Lexan coil spools with Century Series magnetic coil assemblies or're-

, place the relays with equivalent Century Series HFA relays, due to our lack of confidence in the continued qualification of HFA '

f relays with Lexan coil spools. To date, all NSSS HFA relays have been replaced and we are receiving replacement BOP Cat lE HFA re -

l lays from General Electric Co. The BOP Cat lE HFA relay replace-ment will be completed by August 31, 1982.

! Very truly yours, l  %% .

M. H. Milligan

(

Project Engineer Shoreham Nuclear Power Station JSK/pg cc: Mr. Richard DeYoung, Director l

NRC Office of Inspection & Enforcement I Division of Reactor Operation Inspection Mr. J. Higgins, Site NRC All parties ,

i l

i.