ML19274E124
| ML19274E124 | |
| Person / Time | |
|---|---|
| Site: | Yankee Rowe |
| Issue date: | 02/12/1979 |
| From: | Denise R Office of Nuclear Reactor Regulation |
| To: | Desiree Davis Office of Nuclear Reactor Regulation |
| References | |
| TASK-02-04, TASK-02-04.A, TASK-02-04.B, TASK-02-04.C, TASK-02-04.D, TASK-02-04.E, TASK-02-04.F, TASK-2-4, TASK-RR NUDOCS 7903090337 | |
| Download: ML19274E124 (2) | |
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MEMORANDUM FOR: Don Davir.. Chief Systematic Evaluation Program Branch, D0R FROM:
Richard P. Denise. Assistant Director, for Site Technology, DSE
SUBJECT:
ADDITIONAL INFORMATION - YANXEE R0WE SEP REVIEW (TAC No. 07352)
TM following are our requests for additional information and analyses in the field of Geology and-Geotechnical Engineering. These questions and a status of review report were prepared by A. T. Cardone.
Responses to the questions are necessary to complete our review.
I 1.
The stability analysis described in the report " Yankee Nuclear i
Station Probable Maxircum Flood Analysis" made for the
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Sherman and Harriman dam embankments are inadequate. The reasons are that the engineering properties and unit weights of the embankment and supporting materials were assumed, the downstream phreatic surface through the dam embankment'was estimated, and a minimal pseudo-static earthquake force was used in'the analysis.to represent the dynamic ground motion effects on the embankment.
In order to provide adequate assurance that the dams do not present a hazard'to the nuclear plant in the event of their failure, additional stability analyses must be performed for the dam embankments, or it must be shown that the plant can continue to operate safely or can be shut down in a safe,
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controlled manner in the event of failure of either or both dams. If this cannot be shcwn, the stability analyses are to i
be performed and the engineering properties and phreatic surface e
are to be obtained for the embankments according to the procedures described in Department of the Army, Office of the Chief of Engineers Regulation No. 1110-2-1806 " Earthquake Design and Analysis for Corps of Engineers Dams." The foundation materials 8
supporting the dams are to be tested and analyzed according to 3
the procedures described in NRC Reg. Guide 1.132.
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2.
Because of the presence of up to 100 feet thick deposits of glacial material on the slopes flanking the Sheman and Harriman.
reservoirs, an inspection should be made for evidence of creep or tension cracks to provide assurance that the slope deposits will not slide into the reservoirs and cause overtopping of.the
- dras, original Signed By Richard P. Denise Richard P. Denise,' Assistant Director for Site Technology Division of Site. Safety and E ~ironmental Analysis cc:
R. DeYoung V. Ste'io O Ziemann A. Burger f
L. Heller R.' Jackson T. Cardone I
H. Levin DISTRIBUTION:
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