ML20055C039

Final Deficiency Rept Re Defective Agastat E-7000 Series Time Delay Relays,Per IE Info Notice 82-04.Initially Reported on 820407.Affected Relays Corrected by Manufacturer & Returned to Ge.Also Reported Per Part 21

ML20055C039
Person / Time
Site:	Nine Mile Point
Issue date:	07/30/1982
From:	Rhode G NIAGARA MOHAWK POWER CORP.
To:	Starostecki R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
REF-PT21-82 10CFR-050.55E, 10CFR-50.55E, IEIN-82-04, IEIN-82-4, NUDOCS 8208100060
Download: ML20055C039 (2)

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'o M Y NIAGARA RuMOHAWK NIAGARA MOHAWK POWER CORPORATION /300 ERIE BOULEVARD WEST. SYRACUSE N Y.13202/ TELEPHONE (315) 474-1511 July 30, 1982 U.S. Nuclear Regulatory Commission Region I Attention: Mr. R. W. Starostecki, Director Division of Project and Resident Programs 631 Park Avenue King of Prussia, Pennsylvania 19406 Re: Nine Mile Point Unit 2 Docket No. 50-410

Dear Mr. Starostecki:

Enclosea is a final report in accordance with 10CFR50.55(e) for the deficiency regaroing AGASTAT E-7000 Series time-delay relays. This condition was reported by telephone to Mr. H. Kister of your staff on April 7, 1982.

Very truly yours, NIAGARA M0 HAW POWER CORPORATION

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W/ V -

erald K. Rhoae Senior Vice President PEF /kmb .

cc: Director of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, D.C. 20555 Mr. R. D. Schulz, Resident Inspector

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8208100060 820730

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PDR ADOCK 05000410 lg S S PDR 1

NIAGARA M0 HAWK POWER CORPORATION Nine Mile Point Unit 2 t

Docket No. 50-410 Final Report for a Reportable Deficiency Under 10CFR50.55(e)

Regarding AGASTAT E-7000 Series Time-Delay Relays Description of the Deficiency On February 2, 1982, the Control Products Division of Amerace Corporation notified the U.S. Nuclear Regulatory Commission of a deficiency regarding its AGASTAT E-7000 Series time-delay relays in accordance with 10CFR21. This problem is also identified in NRC IE Information Notice 82-04. According to the Information Notice, aooroximately 20 percent of these relays manufactured between July 15, 1981, and January 12, 1982, may not operate properly due to a time- and temperature-based deterioration of the oneumatic timing diaphragm.

This can result in a shorter time delay tha' indicated on the relay dial.

Since AGASTAT E-7000 series time-delay relays were specified for the Nine Mile Point Unit 2 design, information was requested from our nuclear steam system

! supplier, General Electric, and the affected vendors to determine if any of-

! the suspected relays had been received for use at Unit 2. This review '

revealed that, of the prime suocliers, only General Electric, Switchgear Division in Burlington, Iowa, had received relays manufactured during the time period in question. The affected relays were scheduled for use in safety-related switchgear for the Unit 2 emergency standby diesel generators.

Analysis of Safety'Imolication,s l As stated in the above-mentioned information notice, the problem in the affected relays, under certain conditions, could result in shorter time delays than those set on the relay dial. As a result of shorter time delays, the

! safe operation of the emergency standby diesel generators could-be adversely

, affected due to an overload condition.

Corrective Action GE Switchgear Division, Burlington, Iowa, has returned the affected relays to i the manufacturer. The manufacturer has corrected the problem and returned the I relays to GE.

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