ML18037A318
| ML18037A318 | |
| Person / Time | |
|---|---|
| Site: | Nine Mile Point  |
| Issue date: | 02/02/1981 |
| From: | Rhode G NIAGARA MOHAWK POWER CORP. |
| To: | Robert Carlson NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| Shared Package | |
| ML17053C288 | List: |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, NUDOCS 8102090243 | |
| Download: ML18037A318 (6) | |
Text
REGULATORY NFORMATION DISTRIBUTION SYSTEM (RIDS)
ACCE'SSION NBR:8102090243 DOC,DATEs 81/02/02 NOTAR ED:
NO DOCKET ¹ FACILs50 410 Nine Mile Point Nuclear Station, Unit 2r. Niagara Moha 05000410 AUTH,NAME AUTHOR AFFILIATION RHODE're K'iagara Mohawk Power Corp.
RECIP ~ NAME-RECIPIENT AFFILIATION CARLSONgR AT ~
Region ir Philadelphiar Office of the Director
SUBJECT:
Interim deficiency rept re possible future movement of radwaste bldg geologic feature. Corrections to 791204 initial rept encl, Forwards "Geologic Investigation:Radwaste Thrust Structure
" Rept available in Central Files only, DISTRIBUTION CODE:
B019S COPIES RECEIVED:LTR l ENCL SIZE: P
, ~~$ 75i9 TITLE,: Construction Deficiency Report: (10CFR50.55E)
NOTES:
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4 hl 1 NIAGAR H U MOHAW NIAGARAMOHAWKPOWER CORPORATION/300 ERIE BOULEVARDWEST, SYRACUSE, N.Y. 13202/TELEPHONE (315) 474-1511 February 2,
1981 Office of Inspection and Enforcement Region I Attention:
Mr. R. T. Carlson, Chief Reactor Construction and Engineering Support Branch U.S. Nuclear Regulatory Commission 631 Park Avenue King of Prussia, PA 19406
Dear Mr. Carlson:
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e I geg CSI Re:
Nine Mile Point Unit 2 Docket No. 50-410 A potential 50.55(e) deficiency involving the possible future movement of the Nine Mile Point Unit 2 Radwaste Building geologic feature was initially reported to the Nuclear Regulatory Commission on December 4, 1979.
Enclosed is a report regarding the geologic investigation of the Nine Mile Point Unit 2 Radwaste Thrust Structure.
Also enclosed are corrections to this report and to Niagara Mohawk's response to geologic information Request f361. 1.
This report provides the data and analyses to confirm the conclusions made in response to Nuclear Regulatory Commission's Office of Nuclear Reactor Regulation's geologic information Request
(}361.1, which was transmitted to you in our interim 50.55(e) report dated July 24, 1980.
Since the geologic investigation of the Radwaste Thrust Structure is not completed, this report serves as an interim report.
Another interim 10CFR50.55(e) report will be submitted by June 30, 1981.
Very truly yours, GA A MOH K
POW RPORATION Enclosure xc: Director of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, D.C.
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4.
Post-Pleistocene (Holocene) movements have been small if they have occurred at all. It cannot be demonstrated that no Holocene movements have occurred, as no reference features (e.g.
dated infilling sediments) extend entirely across the zones of disturbance.
5.
Future movements along the structure are not likely to occur.
Further relief of the limited amounts of strain now in the rocks will be distributed in the affected ground as dilation and small movements along fractures and bedding surfaces.
The Radwaste Structure is so nearly dead at present levels of exposure that its participation in such future movements would amount to no more than a small fraction of an inch (~1/4 inch). It is still the judgmental opinion of Dames and Moore that the movement on the Radwaste Thrust structure would be very slight amounting to either a negligible movement or at the most a small fraction of an inch.
- However, Dames and Moore has recently pointed out that the state of the art for predicting future movement of. the Radwaste structure does not enable them to give,specific assurance that the above judgment does indeed represent a maximum credible movement.
Consequently, additional mathematical model studies have been conducted which lead Dames and Moore to conclude that one inch is a conservative allowance for future maximum credible movement.
Therefore, an allowance of one inch will be used for design purposes.
6.
The Radwaste Structure is not seismotectonic."
Based on these conclusions it was judged that movements of the Radwaste Structure (if any) would be of no consequence to the operation of the plant.
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