ML20052E455
| ML20052E455 | |
| Person / Time | |
|---|---|
| Site: | Zimmer |
| Issue date: | 04/29/1982 |
| From: | Borgmann E CINCINNATI GAS & ELECTRIC CO. |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, QA-1727, NUDOCS 8205110124 | |
| Download: ML20052E455 (2) | |
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THE CINCINNATI GAS & ELECTRIC COMPANY C
CINCIN N ATI. OHIO 4 5201 April 29, 1982
- c. A. eono tANN QA-1727 5(NIOR VIC E PRE SIDE N T Y
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9 RECElygg Q U.S. Nuclear Pegulatory Comtission Region III l-MAY I O 19825-1
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799 Poosevelt Ibad I'2 kWrn cm
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Glen Ellyn, Illinois 60137 g
Attention:
Mr. J. G. Keppler g
g Regional Administrator b
RE:
NM. H. ZIMMER NUCLEAR POWER STATION - UNIT I 10CFR50.55(e) - ITEM M-32, INCOMPIETE HYDRAULIC ANALYSIS OF CRD PIPING - DOCKET NO. 50-358, CONSTRUCTION PERMIT NO. CPPR-88, W.O. #57300 JOB E-5590, FILE NO. NBC-8, M-32 Gentlemen:
This letter constitutes a final report for the subject design deficiency initially reported to the Camtission under the requirements of 10CFR50.55(e).
The previous interim report, QA-1644, dated February 25, 1982, stated that piping support modifications, based on prelinunary loads have been issued for construction.
The final load analysis is now canplete. 'Ihe CRD Hydraulic Systs is designed to accatmodate all Zimner design basis seismic and dynamic loads plus the hydraulic transient loads induced by scram valve actuation. Although no pipe routing changes are required, various support nodifications will be necessary in both the drywell and at the 546' elevation in the Pcactor Building.
'Ihese modifications include:
A) Iowering the pedestal clamp attachment on the CRD housing in the pedestal area.
B) Adding additional expansion anchors to the structural frame at the pedestal opening.
C) Adding sixteen (16) snubbers to the horizontal CRD piping at tl'e 538' elevation.
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Mr. J. G. Keppler Regional Administrator U. S. Nuclear Begulatory Camlission Ibgion III April 29, 1982 - CA-1727 Page 2 D) Replacing the tubular restraints on the vertical portion of the CRD lines with high strength, heavier wall tubing. The unistrut mmibers will be replaced with tube sections and the clamps replaced.
E) Replacing the tubular restraints on the horizontal portion of the CRD lines at elevation 560 ft, with high strength heavier wall tubing.
h unistrut nenbers will be replaced with tube sections and the clamps replaced. The two supports will be braced together and restraint struts will be attached to the sacrificial shield wall at two elevations.
F) Vertical steel posts will be added to brace the HCU tubular supports.
Approxunately 160 posts are required (80 on each side).
G) A horizontal truss system will be added to support the tops of the tubular posts.
H) The CRD tubing above the HCU units will be seismically restrained.
The supports will consist of new structural members supported fran the existing steel.
I) A longitudinal plate with clamps on the vertical HCU tubular racks will be added to restrain the HCU units in the North-South direction.
'Ihe above listed actions are expected to be canplete by December 31, 1982.
We trust the atave will be found acceptable as a final report under 10CFR50.
55(e).
Very truly yours,
'IEE CINCINNATI GAS & ELECTRIC ODMPANY P
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E. A. BOBQ%NN l
SENIOR VICE PRESIDENI' FKP:ec cc: NBC Resident Inspector l
Attn:
W. F. Christianson l'
NBC Office of Inspection & Enforcanent Washington, D.C. 20555