ML20090E252

Part 21 & Deficiency Rept SDR-137 Re Potentially Defective GE Type Hma Auxiliary Relays.Defective Equipment Will Be Inspected & Corrected,Per GE Instructions

ML20090E252
Person / Time
Site:	Limerick
Issue date:	07/05/1984
From:	Gallagher J PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	Murley T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
REF-PT21-84-334-000 PT21-84-334, PT21-84-334-000, SDR-137, NUDOCS 8407190366
Download: ML20090E252 (4)

Text

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PHILADELPHIA ELECTRIC COMPANY 2301 MARKET STREET P.O. BOX 8699 PHIL ADELPHI A. PA. 19101 (zi s) a414so4 JOSEPH W. G ALL AGHER

. .. . .. . . ", '":::". . .. ... JUL 51984 Mr. Thomas E. Murley, Director United States Nuclear Regulatory Comission Region I 631 Park Avenue King of Prussia, PA 19406

Subject:

Significant Deficiency Report No.137 Potentially Defective Type HMA Auxiliary Relays Limerick Generating Station, Unit 1

Attachment:

Letter: General Electric notification in accordance with 10CFR21, dated 12/16/82 File: QUAL 2-10-2 (SDR - 137)

Dear Mr. Murley:

The attached letter has brought to our attention a potential deficiency in certain type INA auxiliary relays. This deficiency has been previously reported to the USNRC under the provisions of 10CFR21.

We consider the deficiency described in the Attachment as a significant deficiency per 10CFR50.55(e) and are hereby notifying you as required.

We believe that the General Electric report submitted under the provisions of 10CFR21 provides the information required for 10CFR50.55(e) reporting. Therefore, we anticipate that this letter will be our only report to you on this subject.

We will, of course, assure that the potentially defective equipment is inspected and corrected in accordance with the instructions received f rom General Electric.

. Sincerely,

& B/-

Attachments  ;

JPE/drd Copy to: Director of Inspection and Enforcement I United States Nuclear Regulatory Commission ]

Washington, DC 20555 I C. K. Chaudhary, US NRC Resident Inspector l

8407190366 840705 PDR ADOCK 05000352 PDR S _

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l G EN ER Al. h E LECTRIC MANAGEMENT BUSINESS 19355 0715 DEPARTMENT OCNERAL ELECTAiC COMPANY,205 GREAT VALLEY PARKWAY MALVERN. PA Phone (215) 251.F000 December 16,.1982 9

Mr. Charles A. Cameron Manager-Safety Evaluation Programs Nuclear Energy Business Operations

- 175 Curtner Avenue - M/C 682 s ._.

" San Jose, California 95215 -

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Subject:

10CFR21 '

Notification -

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Dear Sir:

Attached is a copy of a letter addressed to our customers who have ~

purchased HMA relays and designated 10CFR21 on the purchase order.

In accordance with our normal practice, we have also sent a copy of this ,

letter to the NRC.

Yours truly,

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_ L.'L. Mankoff

- ' Manager-Engineering LLM/gs Attachment

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POWER SYSTEMS

. GEN ER Al h ELECTRIC MANAGEMENT 1 '

SUSINESS GENERAL ELECTR8C COMPANY. 205 GREAT VALLEY PARKWAY. WhLVERN. PA 19355-0715 DEPARTMENT Phone (215) 2517000 l

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This letter serves to notify you .of.a potential deficiency

.in typa.fMA auxiliary relays ma'hufacturededuringl1974.

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It has been determined that some'HMA' rela [s' manufactured in 1974 have insufficient clearance between'the armature tail

, piece and the molded posts on either side of the tail piece.

If this condition exists, twisting of the armature may cause '

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binding of the armature tail piece when the armature.is ener-gized and prevcnt opening of the armature when it is de- ,

energized.

A review of our records indicates that the potentia _1 de-ficienc durYo y occurred only in HMA relaxL that were manufartured197T.~0 u r7xv 197 d F. As a result, corrective action.was taken to increase the minimum spacing between the armature tail piece and the molded posts to assure free movement of the armature.

Relays manufactured during 1974 can be identified by the date code on the Q.C. Acceptance sticker. The code consists of two numbers followed by any of the following suffixes:

AK, SK, CH, DK. EK. FK. GK, HK. JK, KK, LK. MK. There are no known instances of the potential deficiency existing prior to 1974. However, if it is desired to check relays manuface tured before 1974, the date code identification is as follows:

., the second 1etter of the date code wil&-4e's ' letter preceding ,

• l4 the letter "K" in the' alphabet.'-For example, AG (1971), ,

AH (1972), AJ (1973). '

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It is recomm?nded that HMA relays with any of the listed date codes be inspected for a minimum of an 0.005 inch clearance between the armature tail piece and the posts.

This can be done by inserting an 0.005 inch feeler gauge into the gap on each side of the Do tail force not piece.theSee gauge, the it sketch on the attached page.

should slide easily into the gap.

CAUTION;_ DE-ENERG12E BOTH THE HMA COIL AND CONTACT CIRCUITS -

TEYORE THE GAP CHECK IS MADE.

If less than 0.005 inch clearance exists. it is recommended that the gaps be increased to a minimum of 0.005 inch or that the relay be replaced. The gaps can be -increased by removing material from the molded posts. This option retains the original relay in the system'and. eliminates the need for '

system re-testing. .To gain access to'the molded posts, remove the No. 4-48thex nut that' clamps'theifootiof the armature stop to the molded base and .lif t .the ,st.op ;and armature tail piece -

. out from between the postis. GlE.~idoesYnotTr.ecommend re-working

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• • the armature tail piece because:this would'r.emove the protec-tive metal finish and could lead to jorrosion. In addition, resultant metal chips or filings could inhibit relay operation.

A new replacement HMA relay can'be purchased at 60 percent of

( 6 E. Handbook price. Request a new relay by comple,te model .

number- 6.E. must have a Nuclear damage

• waiver for any device ordered for installation at any Nuclear site. A century series replacement ll relay must:be used for Class I-E service. This of *f er will remain availab'le until July 2,1984.

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