ML20237H897

Notice of Deviation from Insp on 870608-25.Deviation Noted: safety-related Wall in Battery Room Evaluated Per Analysis Procedure for Masonry Block Walls Which Permitted Increase of Allowable Stresses Above That Specified in ACI 531-79

ML20237H897
Person / Time
Site:	Millstone
Issue date:	08/18/1987
From:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
To:
Shared Package
ML20237H889	List: IR 05000423/1987015 ML20237H888 ML20237H893 ML20237H897
References
50-423-87-15, NUDOCS 8708250189
Download: ML20237H897 (1)

Text

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APPENDIX B NOTICE OF DEVIATION Northeast Utilities Company Docket No. 50-423 Millstone Nuclear Power Station License No. NPF-49 Unit No. 2 As a result of the review conducted between June 8 - 25, 1987, in the Regional Office, and in accordance with the " General Statement of Policy and Procedure for NRC Enforcement Actions", 10 CFR2, Appendix C, the following deviation was identified:

The Millstone Station Unit 3 Final Safety Analysis Report (FSAR)' commits to comply with the requirements in Appendix A to the Standard Review Plan (SRP) section 3.8.4 for the evaluation of safety related masonry walls.

The SRP does not permit the use of unreinforced masonry walls in newly constructed plants. It also does not permit the increase of allowable stresses beyond the ACI 531-79 Code limits for the Dead Weight (DW).plus l Operating Basis Earthquake (0BE) design loading condition. The SRP permits an increase of 50% in allowable stress for tension parallel to bed joint, and 30% for tension normal to bed joint and for shear carried by masonry, for the OW plus Safe Shutdown Earthquake (SSE) loading condition.

Contrary to the above, safety related walls in the battery room were evaluated in accordance with " Analysis Procedure for Masonry Block Walls",

SDM 80-14, which permitted the increase of allowable stresses above those specified in the ACI 531-79 Code by 33% for the DW plus OBE design loading condition and by 67% for the DW plus SSE loading condition.

This is a deviation from an FSAR commitment.

Pursuant to the provisions of 10 CFR 2.201, Northeast Utilities Company is hereby requested to submit to this office within thirty days of the date of the letter which transmitted this Notice, a written statement or explanation in reply, including the corrective steps which will be taken to avoid similar deviations in the future. Where good cause is shown, consideration will be given to extending this response time.

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0FFICIAL RECORD COPY MAN 0LY7/16/87 - 0004.0.0 08/14/87

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