ML20072C190

Final Deficiency Rept Re Potentially shorter-than-expected Qualified Life of Square D Co Contactor Coils Installed in Category IE Equipment.Initially Reported on 830119.Coils Will Be Replaced for Equipment Mfg Before 1974 by 830531

ML20072C190
Person / Time
Site:	Shoreham File:Long Island Lighting Company icon.png
Issue date:	02/22/1983
From:	Milligan M LONG ISLAND LIGHTING CO.
To:	Haynes R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
10CFR-050.55E, SNRC-828, NUDOCS 8303080355
Download: ML20072C190 (3)

Text

.

=q f F

I SHOREHAM NUCLEAR POWER STATION P.O. BOX 618, NORTH COUNTRY ROAD + WADING RIVFR, N.Y.11792 Direct Dial Number February 22, 1983 SNRC-828 Mr. Ronald C. Haynes Office of Inspection & Enforcement Region 1 U. S. Nuclear Regulatory Commission 631 Park Avenue King of Prussia, PA 19406 Square D Coil Deficiency

. Shoreham Nuclear Power Station - Unit 1 Docket No. 50-322

Dear Mr. Haynes:

On January 19, 1983, in accordance with 10CFR50.55 (e) , we reported verbally to Region 1 a deficiency with certain contactor coils manufactured by Square D Company. This letter serves as our 30-day written report of this deficiency, and describes the corrective action to be taken.

Description of Deficiency We were advised by a Square D Co. letter dated July 6, 1982, that certain contactor coil materials used in older design coils may exhibit significantly shorter life than previously thought.

During accelerated aging tests, as part of Square D's ongoing nuclear qualification to IEEE 323-1974, it was determined that certain coil materials used in contactor coils (NEMA Size 00 through Size 5, having vendor code "S", and manufactured prior to 1974; as well as NEMA Size 00 through through Size 1 having a vendor code "S" and manufactured between 1974 and 1981 with duty cycle greater than 50 percent and/or subjected to excessive exter-nal heating) do not have a 40-year qualified life as previously anticipated. Square D recommended replacement of these coils if installed in Category lE equipment.

As a result of Square D's letter, a field survey was performed for all Category lE Square D Co. 480 volt motor control centers to identify any of the subject coils installed in Shoreham's motor control centers. The results of this survey were forwarded to Stone and Webster Engineering Corporation (S&W) for their evalua-tion and determination of Phe extent of the life reduction of'these coils.

8303000355 830222 FC-8 935.1 PDR ADOCK 05000322 g pyg f h"

o SNRC-828 February 22, 1983 Page 2 Simultaneously, we directed Square D to clarify the temperature de-pendence of the coil life. Square D provided further clarification in their letter dated November 8, 1982 and stated that the suspect coils would not require immediate replacement since, in Shoreham's worst case application, the coil life would be at least three years.

Upon further discussions with S&W and Square D Co., it was learned that the November 8 letter only concerned coils manufactured during or after 1974. Square D could not justify allowing the pre-1974 coils to remain installed in Class lE circuits due to documented manufacturing problems in this vintage of "S" coils. A telex dated January 6, 1983 was received from Square D Company which stated that the life of these coils was reduced due to inferior magnet wire that may have been used during the manufacturing of the coils.

A total of 102 coils are in the pre-1974 category.

As a result of the above discussions and the information provided by Square D in the above telex, it was determined that this situa-tion constituted a reportable deficiency under 10CFR50.55 (e) .

Corrective Action Replacement contactor coils have been received from Square D Co.

for all Class lE coils (vendor code "S") manufactured prior to 1974. A Change Control Form (CCF R24/10) and E&DCR F-44984 have been issued to authorize the replacement of the subject coils which have been identified by the field survey.

An engineering evaluation is in progress by S&W to determine whether any of the coils manufactured during or after 1974 require pre-fuel load replacement due to their Shoreham-specific applications. Any such coils found to require pre-fuel load replacement will be added to the above replacement program.

The coil replacement is expected to be completed by May 31, 1983.

This letter is our final report to you on this matter.

Very truly yours, b'M M. II. Milligan JSK/ laws 2 cc: J. Higgins, Site NRC All Parties listed in attachment 1

1 . . . ,

we

' d' .

ATTACHMENT 1 Lawrence Brenner, Esq. Herbert H. Brown, Esq.

Administrative Judge Lawrence Coe Lanpher, Esq.

Atomic Safety and Licensin? Karla J. Letsche, Esq. .

Board Panel Kirkpatrick, Lockhart, Hill U.S. Nuclear Regulatory Commission Christopher & Phillips Washington, D.C. 20555 8th Floor 1900 M Street, N.W.

, Washington, D.C. 20036 Dr. Peter A. Morris Administrative Judge Atcmic Safety and Licensing Mr. Marc W. Goldsmith Board Panel Energy Research Group U.S. Nuclear Regulatory Commission 4001 Totten Pond Road Washington, D.C. 20555 Waltham, Massachusetts 02154 Dr. James H. Carpenter MHB Technical Associates Administrative Judge 1723 Hamilton Avenue Atomic Safety and Licensing Suite K Board Panel San Jose, California 95125 U.S. Nuclear Regulatory Commission Washington, D.C. 20555 Stephen B. Latham, Esq.

Twomey, Latham & Shea Daniel F. Brown, Esq. 33 West Second Street Attorney P.O. Box 398 Atomic Safety and Licensing Riverhead, New York 11901 Board Panel U.S. Nuclear Regulatory Commission Washington, D.C. 20565 Ralph Shapiro, Esq.

Cammer and Shapiro, P.C.

9 East 40th Street Bernard M. Bordenick, Esq. New York, New York 10016 David A. Repka, Esq.

U.S. Nuclear Regulatory Commission -

i Washington, D.C. 20555 Matthew J. Kelly, Esq.

State of New York Department of Public Service Three Empire State Plaza Albany, New York 12223

(

-_,