ML20071J309
| ML20071J309 | |
| Person / Time | |
|---|---|
| Site: | Zimmer |
| Issue date: | 05/19/1983 |
| From: | Williams J CINCINNATI GAS & ELECTRIC CO. |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, 956C, LOZ-83-0032, LOZ-83-32, NUDOCS 8305260227 | |
| Download: ML20071J309 (2) | |
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[efg~-l.f THE CINCINNATI GAS & ELECTRIC COMPANY CINCIN N ATt, OHIO 4520t
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May 19, 1983 veu.ao ca.r.o~.
LOZ-83-0032 Docket No. 50-358 U.S. Nuclear Regulatory Commission Region III 799 Roosevelt Road Glen Ellyn, Illinois 60137 Attention:
Mr. J.G. Keppler Regional Administrator Gentlemen:
RE:
WM. H.
ZIMMER NUCLEAR POWER STATION - UNIT 1 10CFR50. 5 5 (e), ITEM-85, ESSENTIAL INSTRUMENTS ATTACHED TO NONESSENTIAL /NONSEISMIC PIPING W.O.
57300, JOB E-5590, FILE NO. 956C, M-85 t
The subject condition was initially reported to the l
Commission as a potentially reportable deficiency on April 20, 1983, pending completion of an engineering evaluation to determine its significance.
During an engineering review of safety related or seismically designed items in non-category I structures, it was found that essential instruments lE22-N001A&B were attached to non-essential, non-seismic piping.
These instruments were the only ones found requiring modification.
l Essential instruments lE22-N001A&B provide an automatic switching function based on condensate storage tank (CST) level.
The high pressure core spray (HPCS) pump is normally lined up to take suction from the CST.
Upon receiving a low CST level signal from these instruments, the pump suction source is switched to the suppression pool.
The safety significance is that should a seismic event rupture the CST it is also possible that the instrument providing the automatic switch-over could become nonfunctional due to its l
nonseismic attachment.
This would result in the loss of the HPCs l
pump suction supply, and without manual action, loss of the HPCS system.
8305260227 830519 Je PDR ADOCK 05000358 Mdf S
PDR 8
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Mr. J.G.
Keppler Regional Administrator May 19, 1983 LOZ-83-0032 Page 2 However, the postulated loss of the HPCS system is designed for by automatic initiation of the Automatic Depressurization System (ADS), Low Pressure Core Spray (LPCS) System, and Low Pressure Core Injection (LPCI) System.
The particular scenario identified does not represent a "new" accident, but rather describes a mechanism that results in the potential loss of the HPCS system.
t Based on the above evaluation, we do not believe the subject condition to be a significant deficiency, and therefore, it is not reportable under the requirements of 10CFR50.55(e).
Very truly yours, THE CINCINNATI GAS & ELECTRIC COMPANY By h
_'n:
ILLIAMS, JR.
/
ENIOR VICE PRESIDENT cc:
NRC Office of Inspection & Enforcement Washington, D.C.
20555 NRC Senior Resident Inspector l
ATTN:
W.F. Christianson NRC Zimmer Project Inspector, Region III i
ATTN:
E.
R. Schweibenz I
l