ML20009D398
| ML20009D398 | |
| Person / Time | |
|---|---|
| Site: | Perry  |
| Issue date: | 07/13/1981 |
| From: | Davidson D CLEVELAND ELECTRIC ILLUMINATING CO. |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, RDC-30(81), NUDOCS 8107240030 | |
| Download: ML20009D398 (2) | |
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u s P.o. BOX 5000 m CLEVELANo. OHIO 44101 m TELEPHONE (216) 622-9800 m ILLUMINATING DLDG e
55 PUBLIC SoVARE Dalwyn R. Davidson VICE PRESIDENT SYSTEM ENGINEERING AND CONSTRUCTION July 13, 1981 47' Q) N
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Mr. James G. Keppler k
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Director of Region III b
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U.S. Nuclear Regulatory Commission V / [y
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Glen Ellyn, Illinois 60137 E,
k%ii, Perry Nuclear Power Plant 4-j RE:
Docket Nos. 50-440; 50-441 Final Report - Nonsafety Sensing Lines on Safety-Related Reciever Tanks
[RDC 30(81)]
Dear Mr. Keppler:
This letter serves as a final report as required by 10CFR50.55(e) concerning safety-related receiver tanks for the emergency diesel starting system being connected to nonsafety-related sensing lines through normally open, safety-related valved for both Units I and II.
This was first reported by W. J. Kacer of The Cleveland Electric Illuminating Company to R. Warnick of your office on June 12, 1981.
This report includes a description of the deficiency, an analysis of the safety implication, and the corrective action taken.
Description of Deficiency Gilbert Associates Incorporated, the Architect / Engineer for Perry Nuclear Power Plant, design drawings D302-351 and D352-351 cover the piping system for the R-44 Standby Diesel Generator Starting Air Systems. The present design shows senr _ag lines capping of f the receiver tanks for the emergency diesel startin; system.
The sensing lines [cight (8) in total] go through normally cpen valves. The tank and the portion of the line, up to and Luciuding the valve, are designed as safety-related. The remaining portion of the sensing line is designed as nonsafety-related.
Analysis of the Safety Implications 3
S Since the lines are nonsafety-related, we must assume that they disappear if a seismic event should occur. Therefore, during a seismic event the
/ D tanks would start blowing down through the sensing lines, the compressor would run continuously and the low pressure alarm would come in.
The 8107240030 810713 PDR ADOCK 05000440 S
PDR Dir'f 7 198f
D Mr. James G, Keppler July 13, 1981 compressor, however, is nonsafety-related and would not be considered to operate during a seismic event. The capability of the diesel generator to start would then be lost af ter some time as the 2 independent tanks blow
-down.
Thus, with these assumptions, the failure of the lines would impair the system safety function.
Corrective Action Taken to Date Gilbert Associates Incorporated is currently revising the design to replace the existing valve with an automatically-closing isolation,alve in the sensing line. Therefore, in case of a break in the nonsafety line, the
. valve will automatically close preventing the tank from blowing down through the sensing lines. This new valve will be designed and installed as safety-related. Anticipated completion of this activity is October of 1981.
Very truly yours, A4 hr Mu Dalwy Davidson Vice President System Engineering and Construction DRD:pab cc:
Mr. J. Hughes - NRC Site Mr. Victor Stello, 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.
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