ML20004F862
| ML20004F862 | |
| Person / Time | |
|---|---|
| Site: | Haddam Neck File:Connecticut Yankee Atomic Power Co icon.png |
| Issue date: | 06/22/1981 |
| From: | Counsil W CONNECTICUT YANKEE ATOMIC POWER CO. |
| To: | Crutchfield D Office of Nuclear Reactor Regulation |
| References | |
| TASK-02-04.F, TASK-2-4.F, TASK-RR A01452, A1452, NUDOCS 8106260035 | |
| Download: ML20004F862 (4) | |
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CONNECTICUT YANKEE ATOMIC POWER COMPANY DERLIN. CO N N ECTIC U T P. o. sox 2 70 HARTFORD. CONNECTICUT 00108
'stspwoor 203-656-8999 June 22, 1981 fp g
Docket No. 50-213 F
A01452
/
g JU.9 2 51981*
Director of Nuclear Reactor Regulation 1
umm 77 Attn:
Mr. Dennis M. Crutchfield, Chief Operating Reactors Branch #5 U. S. Nuclear Regulatory Commission
~
P Washington, D.C.
20555
- b 12
References:
(1)
D. G. Eisenhut letter to SEP Plant Licensees, dated January 14, 1981.
(2)
W. G. Counsil letter to D. G. Eisenhut, dated February 27, 1981.
Gentlemen:
Haddam Neck Plant SEP Topic II-4.F, Settlement of Foundations and Buried Equipment As part of the redirection of the Systematic Evaluation Program, Reference (1), Connecticut Yankee Atomic Power Company (CYAPCO) committed to develop Safety Assessment Reports (SAR's) for certain SEP topics which would be suhnitted for Staff review.
CYAPCO de* ailed this commitment and provided a schedu.1e for submittal of SAR's in Reference (2).
In acccrdance with this commitment, CYAPCO hereby provides the Safety Assessmer t Report for SEP Topic II-4.F, Settlement of Foundations and Buried E.Iuipment, which is included as Attachment 1.
We trust the Staff will appropriately use this information to develop a Safety Evaluation Report for this SEP topic.
Very truly yours, CONNECTICUT YANKEE ATOMIC POWER COMPAt'Y y
f.,.
l(jV W. G. Counsil Senior Vice President 8106260035
Docket No. 50-213 Safety Assessment Report SEP Topic II-4.F, Settlement of Foundations and Buried Equipment June, 1981
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Haddam Neck Plant SEP Safety Assessment Report 7bpic ll-4.F Settlement of Foundations and Buried Equipment
1.0 INTRODUCTION
This topic reviews the protection of safety-related structures, systems, and components against excessive settlement.
2.0 CRITERIA Appendix A to 10 CPR Part 100 states:
The geologic, seismic, and engineering characteristics of a site and its environs shall be investigated in. sufficient scope and detail to provide reasonable assurance that they are sufficiently well understood to permit an adequate evaluation of the proposed site,'and to provide sufficient information to support the determinations. required by these criteria and to permit adequate engineering solutions to actual or potential geologic and seismic effects at the proposed site.
3.0 DISCUSSION The major structures are founded directly on bedrock. Minor structures are founded either on rock, on piles driven into the rock, or in a few places on spread footings on compacted granular fill.
The bedrock is l
a strong granite gneiss.
During construction, the overburden was excavated to permit a thorough examination, and removal of weathered or excess rock material to assure a sound foundation for each of the conditions noted above. The bedrock extends from ground level to about 10 to 20 feet below ground level over most of the plant area. At the most northerly end and at the river's edge, the rock is 30 to 50 feet below ground surface.
l Specifications of the backfill used during construction were not
{
available during-this review.
Careful inspection of all structures cnd major equipment has revealed no observable settlement to date.
'CYAPCO concludes, based on these inspectic.is in conjunction with the underlying competent bedrock, that excessive settlement has been satisfactorily precluded for all structures and all buried equipment.
3.1 ASSOCIATED SEP TOPICS o
ll-4.D Stability of Slopes o
111-1 Classification of Structures, Components, and Systems o
' lll-7.B Design Codes, Criteria, and Load Combinations n
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.....' 3.4.0 CONCwSIONS Based on this review, with particular emphasis to the fact that no observable settlement problems have been noted to date, CYAPCO con-cludes that safety-related structures, systems, and components are adequately protected against excessive settlement.
5.0 REFERENCES
1.
Standard Review Plan Section:
2.5.4 Stability of Subsurface Materials and Foundations 2.
Appendix A to 10 CFR Part 100 t
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