ML20084K029

Final Deficiency Rept Re Design of Valve Coordination for HPCS Sys.Initially Reported on 840216.Light Switch Settings on Drawing B208-065 Will Be Revised to Prevent Valve E22-F001 from Closing Until Valve E22-F015 Open

ML20084K029
Person / Time
Site:	Perry
Issue date:	04/30/1984
From:	Edelman M CLEVELAND ELECTRIC ILLUMINATING CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
RDC-96(84), NUDOCS 8405110074
Download: ML20084K029 (2)

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Pr DoX 5000 - CLEVELAND, OHIO 44101 - TELEPHONE (216) 622-9800 - ILLUMINATING BLDG - 55 PUBLIC RE Serving The Best Location in the Nation MURRAY R. EDELMAN VICE PRESIDENT NUCLE A R 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 Design of Valve Coordination for the HPCS System [RDC 96(84)]

Dear Mr. Keppler:

This letter serves as the final report pursuant to 10CFR50.55(e) on the deficiency concerning the design of valve coordination for the High Pressure Core Spray (HPCS) System. Mr. P. R. Pelke of your of fice was notified February 16, 1984, by Mr. B. D. Walrath of The Cleveland Electric Illuminating Company (CEI) that this problem was being evaluated, and an interim report, dated March 16, 1984, was also submitted. This discrepancy was identified during a safety system functional capability review performed for CEI by GDS Associates.

This report contains a description of the deficiency, analysis of safety implications, and corrective action to be impicmented.

Description of Deficiency FSAR Section 7.3.1.1.1.lb states that if the water level in the condensate storage tanks falls below a predetermined level, the suppression pool suction valve MOV E22-F015 automatically opens. When the E22-F015 valve is fully open, the condensate storage tank suction valve MOV E22-F001 automatically closes. Two level transmitters are used to detect low water level in the condensate storage tank. Either transmitter can cause automatic suction transfer. The suppression pool suction valve also automatically opens if high water level is detected in the suppression pool. Two level transmitters monitor suppression pool water level and either transmitter can initiate opening of the suppression pool suction valve. To prevent losing suction to the pump, the suction valves are interlocked so that one suction path must be open before the other closes.

As the system is designed, valve E22-F001 starts closing before valve E22-F015 is fully open.

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• Mr. J1mes G. Kappler April 30, 1984 Analysis of Safety Implications It can be postulated, with valve E22-F001 starting to close before valve E22-F015 is fully open, that system flow to the HPCS pump could be less than design requirements. This could result in a trip of the HPCS pump and the subsequent loss of HPCS operation.

-Corrective Action Limit switch settings on drawing B208-065 will be revised to prevent valve E22-F001 from starting to close until valve E22-F015 is fully open. A design change to effect this revision will be issued by June 8,1984.

Please call if there are any questions.

Sincerely, MN Murray R. Edelman Vice President Nuclear Group

-MRE:pab cc: Mr. M. L. Gildner 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