ML19211A348
| ML19211A348 | |
| Person / Time | |
|---|---|
| Site: | Yankee Rowe |
| Issue date: | 11/27/1979 |
| From: | Levin H Office of Nuclear Reactor Regulation |
| To: | Crutchfield D Office of Nuclear Reactor Regulation |
| References | |
| TASK-02-03.A, TASK-02-03.B, TASK-02-03.B1, TASK-02-03.C, TASK-02-04.E, TASK-2-3.A, TASK-RR NUDOCS 7912170411 | |
| Download: ML19211A348 (4) | |
Text
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kR RfC UNITED STATES y
NUCLEAR REGULATORY COMMISSION y ) ) s., c ; g WASHINGTON, D. C. 20555
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November 27, 1979
.,y, MEMORANDUM FOR:
D. M. Crutchfield, Chief Systematic Evaluation Program Branch, DOR FROM:
H. A. Levin Systematic Evaluation Program Branch, D0R
SUBJECT:
MEETING
SUMMARY
- YANKEE ATOMIC POWER COMPANY On September 20, 1979, representatives of Yankee Atomic Power Company met with the NRC staff (attendees listed in Enclosure 1) in Bethesda, MD. to discuss details of the following SEP review topics:
II-3.A Hydrologic Description II-3.B Flooding Potential and Protection Requirements II-3.B.1 Capability of Operating Plants to Cope with Design Basis Flooding Conditions II-3.C Safety-Related Water Supply II-4.E Dam Integrity The integrity of the following earth dams under both flood and seismic conditions, was discussed with respect to the potential impact on the plant from flooding or a loss of ultimate heat sink.
1.
Sherman - located at the site.
2.
Harriman - located approximately six miles upstream of the site on the Deerfield River.
3.
Somerset - located approximately 13 miles upstream of Harriman Dam.
The NRC staff presented preliminary findings which indicate a potential breach of both Sherman and Harriman dams for 100% of the Probable Maximum Flood (PMF). This finding is based upon interpretations of the best data available to the staff at the time of the evaluation.
The staff indicated that refinements to the data base may permit a less conservative interpretation of the data wnich may in turn modify the preliminary conclusion. The staffs analysis indicates no breach of Harriman dam at e5% PMF and no break of Somerset dam at 100% PMF. Sheman dam is not predicted to breach for a flood less tnan the Standard Project flood.
The following parameters were identified as requiring further stuay in order to make a more realistic evaluation of the PMF and potential dam failures.
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. 1.
loss rate 2.
unit hydrograph 3.
snape factor reduction of Prooable Maximum Precipitation (PMP) 4.
starting pool level 5.
breach rate The licensee indicated that he is continuing his study of the issue.
His efforts are now directed at providing more definitive data to address the above parameters to further support his July,1977 conclusion that the Yankee Rowe facility can withstand the effects of the PMF. His findings are documented in Report No. YAEC-1139, "Y3nkee Nuclear Station - Probable Maximum Flood Analysis", July 1977.
In a related issue, discussions focused on the seismic capability of Harriman dam. The licensee indicated that he was developing a program including a scope of work and schedule for the seismic evaluation of Harriman dam. Details of this program will be submitted to the staff within a few weeks of this meeting.
t Howard A. Levin Systematic Evaluation Program Branch Division of Operating Reactors
Enclosure:
As stated 1593 138
ENCLOSURE 1 LIST OF ATTENDEES SEP REVIEW 0F YANKEE R0WE SEPTEMBER 20, 1979 YAEco R. B. MacPherson J. W. Stacey J. P. Jacobson G. A. Harper New England Power Service Co.
S. C. Doret KMC, Inc.
R. E. Schaffstall Weston Geophysical R. J. Holt NRC C. H. Hofmayer D. M. Crutchfield P. A. DiBenedetto G. Staley J. T. Greeves D. Segal H. Levin T. Cheng
DISTRIBUTION FOR MEETING S"MMARIES Docket NRC POR Local PDR Central Files TERA SEPB Reading NRR Reading H. Denton E. Case L. Shao D. Eisenhut R. Vollmer W. Russell B. Grimes T. Carter T. Ippolito R. Reid G. Knighton V. Noonan A. Schwencer D. Ziemann D. Crutchfield G. Lainas J. Scinto, OELD OI&E (3)
ACRS (16)
Licensees NRC Participants D. Knuth,fstall, KMC KMC R. Schaf SEP Members R. B. MacPherson, YAECo J. W. Stacey, YAECo J. P. Jacobson, YAECo G. A. Harper, YAECo S. C. Doret, New England Pwr. Service Co.
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