ML20003C518
| ML20003C518 | |
| Person / Time | |
|---|---|
| Site: | Beaver Valley |
| Issue date: | 01/02/1981 |
| From: | Woolever E DUQUESNE LIGHT CO. |
| To: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| Shared Package | |
| ML20003C515 | List: |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, 2DLC-3874, NUDOCS 8103060331 | |
| Download: ML20003C518 (2) | |
Text
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Pestegn, Ps um January 2, 1981
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United States Nuclear Regulatory CodT.ission i
Region I 631 Park Avenue King of Prussia, PA 19405 ATTENTION:
MR. BOYCE H. GRIER, DIR3CTOR
SUBJECT:
Beaver Valley Power Station-Unit No. 2 Docket No. 50-412 Seismic Calculations for Category I Structures Significant Deficiency Report 80-07 Gentlemen:
Enclosed is the " Initial Interim Report" on the above subject.
If you have any questions concerning this report, we are available to meet with Nuclear Regulatory Commission personnel at their convenience.
DUQUESNE LIGHT COMPANY j
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~M M J5 Woolever VICE PRESIDENT cc:
Dr. V. Stello (15)
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Initial Interim Report On Seismic Calculations for Category T. Structures at
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Beaver Valley Power Station - Unit No. 2 1
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A review of seismic calculations for the Auxiliary Building
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(Category I) of Millstone Unit No. 3 has shown that the analysis used to design' the portions of the structure transferr,ing horizontal seismic forces down through the structure to the mat was incomplete.
Beaver Valley Powe.r, Station-Unit 2 has used similar design methods for analysis of the following Category I structures:
Auxiliary. Building, Control Room Extension and Valve Pit, Service Building, Ma'in Steam and Cable Vault Area, Fuel and Decontamination Building, Safeguards Building, and the Diesel Generator Building.
2.'O Immediate Action Taken An initial review of the calculations of the above structures was performed and indicates that there is no structural deficiency in the design of the structures. The detailed review and completion of Auxiliary Building seismic calculations is finished and the structure has been found adequate.
The completion of such
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calculations for the other. structures listed above has been initiated and is scheduled for completion by December 1981.
'. " 3.0 Description of Deficiency l
The analysis used to design the portions of the structure transferring horizontal seismic forces down through the structure to the mat was incomplete to the extent that the cumulative effect of the vertical force couple resisting flexure was not carried down through the structure to the mat, although the analysis used to design the mat did consider this cumulative effect.
4.0 Analysis of Safety Implications Analysis of safety implications will be provided in the final report.
5.0 Corrective Action to Remedy Deficiency Pending the outcome of the detailed review of the seismic calculations of the Category I structures listed above, the calculations, drawings and any other design considerations will be corrected as required.
6.0' Additional Reports.
An interim report will be, issued on June 22, 1981.
The date for the submittal of the dinal report will be indicated at that time.
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