ML20023D482
| ML20023D482 | |
| Person / Time | |
|---|---|
| Site: | Zimmer |
| Issue date: | 05/13/1983 |
| 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, LOZ-83-0031, LOZ-83-31, NUDOCS 8305200536 | |
| Download: ML20023D482 (2) | |
Text
r JE tn THE CINCINNATI GAS & ELECTRIC COMPANY inf^ si
'~
CINCINN ATI, OHIO 45201 s..m.u w s.sn May 13, 1983 LOZ-83-0031
.ra.Ca v.cc rac.ior~r NUCLEAR OPERATIONS 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. 55 (e), ITEM M SEISMIC QUALIFICATION OF THIRTEEN ESSENTIAL DAMPER OPERATOR MOUNTING BRACKETS W.O.
57300, JOB E-5590, FILE NO. 956C, M-24 This letter constitutes an interim report concerning the subject condition initially reported to the Commirsion on October 14, 1980 as a reportable deficiency under the requ.rements of 10CFR50.5 5 (e).
Sargent & Lundy Engineers (S&L) has approved the American Warming and Ventilating Company (AWV) reports covering the analysis to substantiate the design modifications to the mounting brackets for eleven (11) of the thirteen (13) damper assemblies.
AWV has been asked to reanalyze the remaining two (2) assemblies.
It is anticipated that AWV will submit their reanalysis by June 17, 1983.
These analyses and modifications would enable the assemblies to accommodate the seismic loading known at the time for the Purchase Specification.
Additional analysis and modifications will be required to accommodate MK II Containment dynamic loading cases which were identified after the Purchase Order was issued to AWV.
S&L has completed an evaluation of the subject dampers using the revised MK II Containment dynamic loadings and has found that nine (9) of the thirteen (13) dampers would be overstressed even with AWV proposed modifications.
Additional modifications will be implemented to assure the assemblies will accommodate both the original seismic requirement and the MK II Containment loadings.
The remaining four dampers will withstand both the original seismic and the additional MK II dynamic loadings after AWV modifications have been completed.
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8305200536 830513 DR ADOCK 05000358 Mgy 181983 PDR
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Mr. J.G. Keppler Regional Administrator May 13, 1983 LOZ-83-0031 Page 2 The Cincinnati Gas & Electric Company (CG&E) is currently reviewing options for modifications of the nine (9) damper assemblies.
A follow-up report will be submitted to you by August 10, 1983.
We trust the above will be found acceptable as an interim report under 10CFR50.55 (e).
Very truly yours, THE CINCINNATI GAS & ELECTRIC COMPANY By a _7 _
ILLIAMS, J SENIOR VICE PRESIDENT DJS/KRK/sfr cc:
NRC Office of Inspection & Enforcement Washington, D.C.
20555 NRC Senior Resident Inspector ATTN:
W.F. Christianson NRC Zimmer Project Inspector, Region III ATTN:
E. R. Schweibenz i
l 1
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