ML20005A332

Final Deficiency Rept Re Possible Future Movement of Radwaste Bldg Geologic Feature,Initially Reported on 791204. All Affected safety-related Structures Will Be Designed to Conservatively Allow for One Inch Max Horizontal Movement

ML20005A332
Person / Time
Site:	Nine Mile Point
Issue date:	06/25/1981
From:	Rhode G NIAGARA MOHAWK POWER CORP.
To:	Brunner E NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
10CFR-050.55E, 10CFR-50.55E, NUDOCS 8106300199
Download: ML20005A332 (2)

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) ? 0 A .N llk NIAGARA A4oHAWK POWER CORPORATION /300 ER!E BCULEVARo WEST. SYRACUSE. N Y.13202/ TELEPHONE 018) 4741511 June 25,1981 Office of Inspection and Enforcenent Region I Attention: Mr. Elden J. Brunner, Acting Director g  ?> i I . ..

Division of P.esident and Project Inspection S O! ' e ,' s U. S. iluclear Regulatory Connission Y ,

g. C)l J F) 'fD 631 Park Avenue Q?

King of Prussia, PA 19406 h JUN 2 91981* ._.3g if

Dear ifr. Brunner:

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Re: !!ine fille Point Unit 2 Docket No. 50-410 N If)'

Attached is the final repcrt of the 10 CFR 50.55(e) deficiency regarding the possible future novement of the Radwaste Building geologic feature. This deficiency as initially reported to the Region I Office of Inspection and Enforcement on December 4,1979.

Very truly yours, NIAGARA f10HAllK P0llER CORPORATION

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Y . i.

y /Ki G-fW Getald K. ,hode Vice Presi nt Systen Project ifanagement

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PEF:ja xc: Director Office of Inspection and Enforcement U. S. Nuclear Regulatory Connission Washington, D. C. 20555 -

Mr. B. J. Youngblood, Chief 1.icensing Branch Ho.1 ggg7 Division of Licensing 5 j

Office of Nuclear Reactor Regulation /

t U. S. Iluclear Regulatory Commission //f llashington, D. C. 20555 sman m S P00R ORIGINAL

4 . .

NIAGARA f10HAUX POUER CORPORATION

. Nine lifle Point Unit 2 Docket No. 50-410 Final 50.55(e) Report for Potential Deficiency Including Movement of the Radwaste Building Geologic Feature Description of Deficiency In December,1979, the geologic investigation of the Radwaste geologic feature (thrust structure) concluded that although it was not believed that the feature was capable of generating earthquake type movement, some small rock adjustments may occur over the forty-year plant life. This could result in redesign of certain Unit 2 structures and systems.

Conclusion The geologic investigation of the Radwaste geologic feature has concluded that possible future novements of the feature would amount to no more than a sna11 fraction of an inch ( 11/4 inch). However, a conservative allouance of one inch horizontal novement will be used for design purposes.

In addition, the possible settlenent of the brecciated naterial in the Radwaste geologic feature has been investigated. It is our judgnent, based on this investigation, that differential settlement resulting fron cocpression of the breccia zone under the loading inposed by the Radwaste Buf1 ding will be less than 1/10 of an inch. The Radwaste Building has been designed for this potential settlement.

Analysis of the Safety Implications _

The potential cover,ent of the Radwaste geologic feature was not included in the original design criteria for safety related structures. Therefore, this condition is determined to be reportable under 10 CFR 50.55(e) since it could have adversely affected the safety of operations of plant had it remained uncorrected.

Corrective Action All affected safety related structures will be designed to conservatively allow for a maxinun horizontal novement of one inch. The Radwaste Building has been designed for the potential settlement of the brecciateo caterial in the Raduaste geologic feature.

P00R ORIGINAL