ML20009A480

Significant Deficiency Rept,Previously Reported Under 10CFR21 Re GE Power Generation Control Complex,Loose Tandem Contact Blocks on CR2940 Switches.Deficiency Described in Encl GE 810520 Ltr Determined Reportable Per 10CFR50.55e

ML20009A480
Person / Time
Site:	Limerick
Issue date:	07/02/1981
From:	Kemper J PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
10CFR-050.55E, 10CFR-50.55E, NUDOCS 8107130212
Download: ML20009A480 (2)

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PHILADELPHIA ELECTRIC COMPANY 2301 M ARKET STREET P.O. BOX 8699 1881 -1981 PHILADELPHIA. PA.19101 (215) 841-45o 2 -

JOHN S KEMPER  !

VICE PRESID ENT \, ,s a m(. ems a memc. Amo ma ss a nc >e f =

~l  :. . %Ilj Mr. Boyce Grier, Director E u,, 1U/ b A

United States Nuclear Regulatory Commission 4 cd'y e% C Office of Inspection and Enforcement, Region I 631 Park A;enue

![ . Y4 ./O King of Prussia, PA 19406 Q '7 p p @g\

Subject:

S ig ni f '. c a n t Deficiency Report No. 44 Genert.l Electric Power Generation Contrcl Complex - Loose Tandum Contact Blocks on CR2940 Switches Limerick Generating Station, Units 1 and 2 NRC Construction Permit Nos. CPPR-106, 107 i

Attachment:

Latter H. G. DeVoss (GE) to R. A. Mulford (PECO) dated 5-20-81 File: QUAL 2-10-2 (SDR #44)

Dear Mr. Grier:

The attached letter has brought to our attention a deficiency in the subject General Electric Power Generation Control Complex (PGCC) which has been previously reported to the USNRC by General Electric Company under the provisions of 10CFR, Part 21. The PGCC is being supplied by General Electric for use at Limerick Genera-ting Station.

The deficiency consists of loose contact blocks on CR2940 tandum block control switches which, if loosened sufficiently, could inhibit proper operation of the switch.

l We consider the deficiency described in the attachment to be 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 10CFR, Part 21 provides the information required

! for 10CFR50.55(c) reporting. Therefore, we anticipate that this letter will be our only report to you on the subject.

8107130212 810702 h

PDR ADOCK 0S0003S2 S PDR j( {

- o We will, of course, assure that the subject contact blocks at Limerick are properly cightened in accordance with instructions from General Electric.

Sincerely,

[Wf JPE/gra Attachment Copy to: Director of Inspection and Enforcement United States Nuclear Regulatory Commission Washington, D.C. 20555 J. P. Durr, Resident NRC Inspector

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GEN ER AL h, ELECTRIC NUCLEAR POWER

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a. A. s.y.g.,.,3, . ,. , SYSTEMS DIVISION GENERAL ELECTRIC COMPANY,175 CURTNER AVE., SAN JOSE, CALIFORNIA 95125 MC 391, (408) 925-5159 May 20, 1981 PE- 2505 Mr. R. A. Mulford Project Manager LGS Units 1 & 2 Philadelphia Electric Co.

2301 Market Street Philadelphia, PA 19101

SUBJECT:

LIMERICK GENERATING STATION, UNITS 1 & 2 REPORTABLE DEFICIENCY - CR2940 SWITCHES - LOOSE TANDUM CONTACT BLOCKS h) This is to inform you of a condition concerning CR2940 tandum block control switches supplied on the Grand Gulf PGCC and evaluated as reportable under 10CFR Part 21. These Grand Gulf supplied devices have a defect. The switches have contact blocks that came loose during shipment to the site. Vibration during a seismic event could cause a contact block to loosen sufficiently further to inhibit proper operation of the switch.

General Electric has issued an FDI for correction of this defect at Grand Gulf and is further in the process of issuing similar formalized instruction to other sites, including Limerick, for appropriate inspection and correction. For contact blocks that are found loose, the nues holdir.g the ccr.tzet b!cck are h be locSened cna at a time, Lock-Tite applied, and then retightened.

This corrective program will be an FDDR action at the Limerick site.

Very trul urs,

/ ) ow H. G..DeVc ss Project Manager Limerick Generating Station HGD:rf/887 cc: R. H. Elias R, J. Lees J. B. Roche Files: 3.1, 3.11.3, LB

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