ML20028E757
| ML20028E757 | |
| Person / Time | |
|---|---|
| Site: | Perry  |
| Issue date: | 01/21/1983 |
| From: | Edelman M CLEVELAND ELECTRIC ILLUMINATING CO. |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, RDC-33(81), NUDOCS 8301280178 | |
| Download: ML20028E757 (2) | |
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TELEPHONE (216) 622-9800 - ILLUMINATING SLOG. - $5 PUBLICSQUARE CLEVELAND, oHlo 44101 P.o. box 5000 Serving The Best Location in the Nation WfRAY R. EDELMAN January 21, 1983 WCE MESloENT NUCt1AR Mr. James G. Keppler Regional Administrator, Region III Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, Illinois 60137 RE:
Perry Nuclear Power Plant Docket Nos. 50-440; 50-441 Final Report on General Electric CR2490 Tandem Block Switches
[RDC 33(81)]
Dear Mr. Keppler:
This letter serves as the final report pursuant to 10CFR50.55(e) on the potential significant deficiency concerning CR2940 tandem block switch assemblies supplied by General Electric (CE) for use in the Power Generation Control Complex (PGCC).
On June 26, 1981, Mr. W. J. Kacer of The Cleveland Electric Illuminating Company notified Mr. L. McGregor of your of fice that this problem was being investigated.
Our interim report on this subject was filed July 24, 1981.
This report contains a description of the deficiency, the corrective action taken, and an analysis of safety implication.
Description of Deficiency The General Electric CR2940 tandem block switch assemblies may contain contact blocks in which the attaching screws have shaken loose during shipment.
Vibration during a seismic event could cause the contact block to loosen suf ficiently further to inhibit proper operation of the switch.
This condi-tion was identified by General Electric to The Cleveland Electric Illuminating Company on May 20, 1981.
An inspection of the switches contained in the Unit 1 PGCC paaels revealed ten loose block assemblies. Four loose block assemblies were found during inspec-tion of the Unit 2 panels.
Analysis of Safety Implications The GE CR2940 switch assemblies are utilized for safety-related manual control functions. The loss of the integrity of these switch assemblies could delay manual operation during an analyzed plant event such that technical specifica-tion limits could be exceeded.
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63'01280178 830121 PDR ADOCK 05000440 JAN 2 4 g S
Mr. James G. K:pplcr J;nuary 21 -1983 e
e Corrective Action CE issued Field Deviation Disposition Requests (FDDR) KL1-572 and KL2-586 detailing the corrective action to be taken for Units 1 and 2 respectively.
The corrective action consisted of retightening any loose screws to a torque value of 8-9 inch pounds. Although our interim report on this subject stated that Loc-Tite would be applied prior to tightening of the screws, this measure was not implemented. After our interim report was filed, CE provided notifi-cation by revision to FDDR KL1-571 that Loc-Tite should not be used as excess Loc-Tite could migrate into the switch.
Corrective action for the ten Unit 1 blocks identified in FDDR KL1-572 Revision 1, was completed February 16, 1982. FDDR KL2-586 was completed December 6, 1982, implementing corrective action for the Unit 2 tandem blocks.
All corrective action concerning the CR2940 switch assemblies is now complete.
Very truly yours, Murray R. Edelman Vice President Nuclear Group MRE:pab cc:
Mr. M. L. Cildner NRC Site Office Director Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, D.C.
20555 U.S. Nuclear Regulatory Commission c/o Document Management Branch Washington, D.C.
20555 I
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