ML20024E966
| ML20024E966 | |
| Person / Time | |
|---|---|
| Site: | Yankee Rowe |
| Issue date: | 09/02/1983 |
| From: | Kay J YANKEE ATOMIC ELECTRIC CO. |
| To: | Crutchfield D Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20024E967 | List: |
| References | |
| TASK-03-06, TASK-3-6, TASK-RR FYR-83-83, NUDOCS 8309080043 | |
| Download: ML20024E966 (2) | |
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,n Telephon2 (617) 8724100 TWX 710-380 7619 YANKEE ATOMIC ELECTRIC COMPANY 2.C.2.1 FYR 83-83
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1671 Worcester Road, Framingham, Massachusetts 01701 xus
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September 2, 1983 United States Nuclear Regulatory Commission Washington, D. C. 20555 Attention:
Mr. Dennis M. Crutchfield, Chief Operating Reactors Branch No. 5 Division of Licensing
Reference:
(a)
License No. DPR-3 (Docket No. 50-29)
Subject:
SEP Topic Ill-6:
Seismic Evaluation Reports
Dear Sir:
Enclosed are 5 copies each of the following seismic evaluation reports:
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o Pipe Stress Analysis Report (2 volumes) o An Evaluation of the Seismic Adequacy of the Hot Shutdown Syctem in the Yankee Nuclear Power Station at Rowe, Massachusetts (2 volumes)
The first report provides the results of the piping analysis performed by Cygna Energy Services for Yankee Atomic Electric Company. Detailed piping analyses were performed on selected systems with additional analytical emphasis placed on the proposed Hot Shutdown System (HSS). The objective of this program was to assure plant integrity by demonstrating the capability of the plant to achieve and maintain a safe shutdown condition (hot shutdown) for as long as necessary. This condition would facilitate repairs, as necessary, of remaining non-essential" systems leading to eventual cold shutdown of the plant. Based on the analyses performed, the Hot Shutdown System piping will meet the appropriate code stress allowables and will maintain the plant in a safe condition while allowing for any repairs necessary to achieve cold shutdown. Implementation of the HSS was initiated during the 1982 (Cycle XVI) refueling outage and will be completed during the Cycle XVIII refueling outage.
The second report, performed for Yankee Atomic Electric Company by EQE, Incorporated, provides the results of an evaluation of the seismic strength of 8309080043 830902 DR ADOCK 05000 f*
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, United States Nuclear Regulatory Commission September 2, 1983 Attention:
Mr. Dennis M. Crutchfield Page 2 the, Hot Shutdown System equipment based on a combination of the following engineering procedures:
o-A walkdown by seismic experts of the system and an assessment of the HSS based on the experience of similar equipmsnt in past strong earthquakes, o
In-situ testing and measurements of the response frequencies of selected equipment from the HSS, o
Detailed. seismic analyses of the structural integrity of selected equipment.
l The results from this evaluation indicate'that most of the equipment that makes up the Hot Shutdown System was found to be adequate to withstand the required earthquake motions. A few items required evaluation in greater detail or minor anchorage modifications.- These items will be resclved during the implementation of the Hot Shutdown System.
We trust this information is satisfactory; however, if you have any questions, please contact us.
Very truly yours, YANKEE ATOMIC ELECTRIC COMPANY
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. A. Kay Senior Engineer - Licensing JAK/dsm Enclosures i
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