ML20117C833
| ML20117C833 | |
| Person / Time | |
|---|---|
| Site: | Perry  |
| Issue date: | 04/30/1985 |
| From: | Edelman M CLEVELAND ELECTRIC ILLUMINATING CO., COMMONWEALTH EDISON CO. |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| (RDC-132(85)), PY-CEI-OIE-0039, PY-CEI-OIE-39, NUDOCS 8505090563 | |
| Download: ML20117C833 (2) | |
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hm 0 THE CLEVELAND ELECTRIC ILLUMIN ATING COMPANY P O. BOX 5000 - CLEVELAND, OHIO 44101 - TELEPHONE (216) 622-9800 - lLLUMINATING BLDG - $5 PUBLICSQUARE Serving The Best Location in the Nation MURRAY R. EDELMAN VICE PRESIDENT NUCUAR April 30, 1985 PY-CEI/OIE-0039LQ 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 Class lE Power System During A Loss of Coolant Accident With Degraded Offsite Power
[RDC 132(85)]
Dear Mr. Keppler:
This letter is an interim report pursuant to 10CFR50.55(e) on the potentially significant deficiency concerning the starting voltages to some motors in the Class lE power system during the simultaneous conditions of degraded offsite power and a loss of coolant accident (LOCA).
Mr. James McCormick-Barger of your office was notified on April 1, 1985 by Mr. E. Riley of The Cleveland Electric Illuminating Company that this problem was being evaluated per Deviation Analysis Report 230.
Description of Deficiency The Class 1E A.C. power system provides power to safety-related equipment and controls in the plant.
The system is divided into three independent divisions:
Division 1, Division 2, and Division 3.
Each division distributes power at 4.16kV, 480V and 120V.
Load flow studies of the Class 1E power system have indicated that the starting voltages to some 480V motors may be less than the specified minimum (75 percent of nominal as stated in FSAR Section 8.3.1.1.4.lb) during the simultaneous conditions of degraded offsite power and a LOCA.
8505090563 850430 PDR ADOCK 05000440 MAY 2 1985 S
PDR DJ
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Mr. Jn Oc G. KGppler April 30, 1985 CEI is evaluating the effect of allowing the affected Class 1E motor voltages to fall below the specified minimum during motor starting following a LOCA.
The safety implications of this deficiency will be determined based upon this evaluation.
Corrective Action Not withstanding the results of the above analysis, we are currently pursuing design changes to modify the sequential loading of the Class IE loads which are connected following a LOCA with offsite power available.
These changes will result in 75 percent or greater starting voltage being supplied to all 480V motors during the simultaneous conditions of degraded offsite power and a LOCA as stated in FSAR Section 8.3.1.1.4.lb.
Another report, either interim or final will be provided when additional information is available.
If you have any questions, please call.
Sincerely, 4t td__.
Murra R. Edelman Vice President Nuclear Group MRE:pab cc:
Mr. J. A Grobe USNRC, Site Office (SBB50)
Mr. D. E. Keating USNRC, Site Office (SBB50)
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 1100 Circle 75 Parkway, Suite 1500 Atlanta, Georgia 30339 f