ML20092C509
| ML20092C509 | |
| Person / Time | |
|---|---|
| Site: | Perry  |
| Issue date: | 06/08/1984 |
| From: | Edelman M CLEVELAND ELECTRIC ILLUMINATING CO. |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| REF-PT21-84-324-000 (RDC-108(84)), PT21-84-324, PT21-84-324-000, NUDOCS 8406210214 | |
| Download: ML20092C509 (2) | |
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Serving The Best Location m the Nation MURRAY R. EDELMAN VICE PRESIDENT NUCLE AR Mr. James G. Keppler Regional Administrator, Region III Of fice 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 Deficiency in Nine 480 Volt AC Circuit Breakers Supplied by Brown Boveri Electric [RDC 108(84)]
Dear Mr. Keppler:
This letter serves as our interim report pursuant to 10CFR50.55(e) concerning 480 volt circuit breakers furnished by Brown Boveri Electric, having solid state trip devices containing silicon controlled rectifiers (SCRs) which exhibit excessive Icakage current. Our evaluation of this condition per Deviation Analysis Report 186 was first reported by Mr. P. Martin of The Cleveland Electric Illuminating Company to Mr. J. McCormick-Barger of your office on May 8, 1984. This report contains a description of the deficiency and the planned course of action for completion of our evaluation for significance.
Description of Deficiency Brown Boveri Electric (BBE) supplied two hundred sixty-three (263) 480 volt circuit breakers to the Perry Nuclear Power Plant (PNPP), Units 1 and 2.
On April 18, 1984, BBE flied a 10CFR21 Report with the Nuclear Regulatory Commission concerning SCRs in the BBE Solid State Trip Devices of the K-600S through K-2000S, K-3000S and K-4000S series of circuit breakers used in Class 1E application at the Limecick Generating Station. These solid state trip devices were exhibitinr; tipurious tripping of the circuit breakers under testing by BBE.
On April 26, l'184, BBE informed PNPP via a letter that PNPP was one of the f acilities having Solfd State Trip Devices located in the Type K-600S through V-2000S, K-30008 and K 4000S circuit breakers.
As a result of the testing by BBE on the solid state trip devices, they developed an acceptance test of the output circuits for breakers in service, which was an attachment to the 10CFR21 Report.
During late May 1984, the recommended test was performed on-site in accordance with the BBE criteria to determine if the two hundred forty-eight (248) installed solid state trip devices exhibited excessive leakage.
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r Mr.. Jcmes G. Kcppist Juns 8, 1984 Nine circuit breakers (six installed in Unit I and three installed in Unit 2) were found to have leakage values which will warrant their replacement. The solid state trip devices located in the remaining 480 V circuit breakers were found acceptable.
Corrective Action Nonconformance Reports NDS 0045 and NDS 0046 were issued for Unit 1 and Unit 2 respectively, to document our corrective action.
Presently, PNPP is requesting from BBE the procedure and the necessary components for the replacement of the defective SCRs in the solid state trip devices.
Once received, PNPP will replace the defective SCRs.
Brown Boveri Electric has agreed to perform the leakage test on fif teen (15) circuit breakers previously returned to BBE for unrelated nonconforming conditions.
We plan to submit our final report on this subject by September 7,1984.
Please call if there are any additional questions.
Sincerely, k
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Murray R. Edelman Vice President Nuclear Group MRE:pab cc Mr. J. A. Crobe 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 Records Center, SEE-IN Institute of Nuclear Power Operations 1100 Circle 75 Parkway, Suite 1500 Atlanta, Georgia 30339
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