ML20050B664

Requests Addl Info Re SEP Topic II.4.D, Stability of Slopes. Response Requested within 30 Days of Ltr Receipt

ML20050B664
Person / Time
Site:	Yankee Rowe
Issue date:	03/31/1982
From:	Crutchfield D Office of Nuclear Reactor Regulation
To:	Kay J YANKEE ATOMIC ELECTRIC CO.
References
TASK-02-04.D, TASK-2-4.D, TASK-RR LSO5-82-03-103, LSO5-82-3-103, NUDOCS 8204070103
Download: ML20050B664 (4)

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March 31,1982 Docket No. 50-29 941/

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Mr. James A. Kay g0 Senior Engineer - Licensing

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1671 Worcester Road 9

Framingham, Massachusetts 01701

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SUBJECT:

REQUEST FOR ADDITIONAL INFORMATION FOR SEP TOPIC II-4.D, STABILITY OF SLOPES - YANKEE NUCLEAR POWER STATION

Reference:

Letter from D.M. Crutchfield to J.A. Kay, " Guidance for the Assessment of SEP Topics II-4.D, Stability of Slopes, and II-4.F, Settlement of Foundations and Buried Equipment -

Yankee," dated August 5,1981.

During our review of SEP Topic II-4.D, " Stability of Slopes," we have found that additional information (see enclosure) is needed to complete our review.

t Provide your response within 30 days of the receipt of this letter and in the format requested in the referenced letter,. so that our evaluation can be completed in a timely manner.

The reporting and/or recordkeeping requirements contained in this letter af-fect fewer than ten respondents; therefore, OMB clearance is not required under P.L.96-511.

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Sincerely, if c % i.q -.m y.g p a6hb Dennis M. Crutchfield, Chief ADDI Operating Reactors Branch No. 5 4,$l./G/

Division of Licensing

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Enclosure:

As stated cc w/ enclosure:

See next page 8204070103 820331 PDR ADOCK 05000029 y)fg P

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YANKEE Docket No. 50-29 I

I Mr. James A. Kay j

cc Mr. James E. Tribble, President Yankee Atomic Electric Company 25 Research Drive Westborough, Massachusetts 01581 Greenfield Contwnity College 1 College Drive Greenfield, Massachusetts 01301 h

i Chairman Board of Selectmen Town of Rowe I

Rowe, Massachusetts 01367 i

It' Energy Facilities Siting Council 14th Floor One Ashburton Place Boston, Massachusetts 02108 U. S. Environmental Protection Agency Region I Office ATTN: EIS C0ORDINATOR JFK Federal Building Boston, Massachusetts 02203 Resident Inspector Yankee Rowe Nuclear Power Station c/o U.S. NRC Post Office Box 28 Monroe Bridge, Massachusetts 01350 e

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Additional Information Reeded (SEP Topic II-4D)

Plant Name:

Yankee Docket No.:

50-029 Topic II-40. Stability of Slopes In order for the staff to be able to concur in the licensee's finding that

" Stability of slopes is noc a safety problem at Yankee", the bases for the licensee's conclusion must be presented in the Safety Assessment Repo using the format provided to the licensee by the staff.

Information presented must be sufficient to demonstrate the dynamic and e

static stability of all slopes whose failure could adversely affect, directly or indirectly, safety-related structures of the nuclear plant or pose a hazard to the public.

Completeness of information is determined by the ability to make an independent evaluation on the basis of information provided.

We expect that the following information will meet this need:

1.

General plan with vicinity map.

2.

Large-scale embankment plans for any fill structures where a slope failure could adversely affect safety-related facilities, with boring and instrumentation locations shown.

3. Embankment and cut slope cross sections with instrumentation shown.

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4. Embankment and cut slope details.

5. Graphic sunmaries of embankment and cut slope shear strength test data, with selected design values shown.

6. Embankment and cut slope stability cross sections with design assumptions, critical failure surfaces, and factors of safety shown.

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7. Embankment and cut slope stability evaluation.

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Embankment seepage control design with assumptions, section, and selected design scheme shown, i

9.

Instrumentation installation details.

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Interpretation of instrumentation data.

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(a)

Inclinometer data-profiles of slope movement with time.

J (b) Profiles or contour plans of survey monument displacement.

(c)

Embankment section with embankment and foundation pore pressure l

L, contours.

It may be necessary to plot contour diagrams for various dates and pool elevations, j

(d)

Embankment section showing phreatic surface.

11.

Topographic map showing contours before construction.

12.

Topographic map showing contours af ter construction 13.

Site plan showing and identifying all safety-related structures and appurtenances.

14.

Embankment or cut sections that superimpose the foundations of safety-related structures which could be affected by slope failure.

15.

Embankment or cut sections that superimpose the location and orientation of buried safety-related equipment (e.g., pipelines, electrical conduit, etc.) which could be affected by slope failure.

16.

An assessment of the potential for liquefaction at the site.

17 A summary and description of groundwater, seepage, and high and low groundwater conditions.

18.

An assessment of the ground motion (acceleration) associated with the Safe Shutdown Earthquake (SSE).