ML20138K286

Final Deficiency Rept (Rdc 143(85)) Re Failure to Provide Divisional Separation Requirements for Neutron Monitoring Sys,Per Reg Guide 1.75.Initially Reported on 850710. Condition Not Reportable Per 10CFR50.55(e)

ML20138K286
Person / Time
Site:	Perry
Issue date:	10/17/1985
From:	Edelman M CLEVELAND ELECTRIC ILLUMINATING CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
RTR-REGGD-01.075, RTR-REGGD-1.075 (RDC-143(85)), (RDC-143-(85)), PY-CEI-OIE-0127, PY-CEI-OIE-127, NUDOCS 8510300129
Download: ML20138K286 (2)

Text

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e THE CLEVELAND ELECTRIC ILLUMIN ATING COMPANY P.O. BOX 5000 - CLEVELAND, OHIO 44101 - TELEPHONE (216) 622-9800 - lLLUMINATING BLDG. - 55 PUBLICSOUARE Serving The Best L.ocation in the Nation MURRAY R. EDELMAN VICE NtESIDENT October 17, 1985 NUCUAR PY-CEI/OIE 0127 L 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 Divisional Separation Requirements for the Neutron Monitoring System [RDC 143(85)]~

Dear Mr. Keppler:

This letter is the final report pursuant to 10CFR50.55(e) con-cerning divisional separation requirements for the Neutron Monitoring (C51) System. This item was reported by telephone to Mr. J. McCormick-Barger of your office on J 'y 10, 1985, by .

Mr. E. Riley of The Cleveland Electric O les.nating Company (CEI).

This item was evaluated per Deviatior ,i In .s Report 248, and an interim report was submitted on Augub:: 8, -9 5 . It has been determined that this condition is not reportable pursuant to 10CFR50.55(e).

Description of Potential Deficiency The power supply to the Neutron Monitoring (C51) System was changed to the Anticipated Transient Without Scram, Uninterruptable Power Supply (ATWS UPS) using 120V AC vital inverters (Rl4 Systems).

Since the C51 System has four divisions, R14 was split into four divisions. A note was added to the elementary diagram (B-208-038, sh. B01) to maintain separation from the Reactor Protection System (RPS) cables. In some instances this requirement was not carried through to the wire list or in the field. Also, there was no requirement to maintain separation for ATWS UPS power from Engi-neered Safety Features (ESP) Divisional Power. Because of this, Division 3 ATWS UPS (fed from ESF, Division 1) cables are routed with ESF Division 3 cables. This was considered to be a potential violation of the divisional separation requirements of Regulatory Guide 1.75.

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- ' Mr. James G. Koppler October 17, 1985

, PY-CEI/OIE 0127 L Completion of Evaluation The worst case condition that can be postulated is a fault on both an ECCS divisional cable and the divisional Neutron Monitoring System Power Supply. These cables share a common cable raceway.

For every case where this fault can occur, a safety-related circuit breaker in series with a fuse protects the 480V AC and 125V DC busses. Two safety-related means are thus provided to clear the worst postulated condition prior to causing any detrimental effects on.any other Division 1 and 2 Class lE loads. The separation requirements of Regulatory Guide 1.75 have been met pursuant to the implementation described in FSAR Tables 1.8-1 and 8.1-2. In addition, General Electric, our NSSS Supplier, evaluated the conditions which led to the identified problem and found no other similar occurrences of this situation. Therefore, this condition does not represent a significant deficiency as defined in 10CFn50.55(e).

If there are any questions, please call.

Sincerely, A h Murray R. Edelman Vice President Nuclear Group MRE:sab cc: J. A. Grobe

. USNRC Site Office SBB50 J. J. Stefano, Project Manager Licensing Branch, No. 1 U.S. Nuclear Regulatory Commission Washington, D.C. 20555 j Director Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, D.C. 20555 U.S. Nuclear Regulatory Commission Document Control Desk Washington, D.C. 20555 Records Center, SEE-IN Institute of Nuclear Power Operations 1 1100 circle 75 Parkway, Suite 1500 Atlanta, Georgia 30339 i

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