ML20237H893

Notice of Violation from Insp on 870608-25.Violation Noted: Inadequate Design Verification of Calculation 12179-NS(8)-108 Resulted in Lack of Consideration & Documentation of Several Major Structural Design Aspects

ML20237H893
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 8708250188
Download: ML20237H893 (1)

Text

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APPENDIX A NOTICE OF VIOLATION Northeast Utilities Company Docket ra. 50-423 Millstone Nuclear Power Station License No. NPF-49 Unit No. 3 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 violation was identified:

10 CFR 50, Appendix B, Criterion III requires that design control measures provide means for verifying or checking the adequacy of the design, such as by the performance of design reviews. Northeast Utilities Quality Assurance Program reiterates the cbove requirement in section 3.2.4 of the QA program topical report (NU-QA-1).

Contrary to the above, inadequate design verification of calculation No.

12179-NS(8)-108, for the evaluation and qualification of battery room walls and slabs to seismic category I requirements, resulted in the lack of consideration and documentation of several major structural design aspects.

These included (1) design rationale for the selection of one wall of significantly smaller area than several other walls in the battery rooms as the governing design condition, (2) evaluation of shear stresses along the boundary of governing wall (or walls), (3) evaluation of the battery room slabs for seismic inertia loads in the vertical, north-south and east-west directions, and (4) evaluation of the slab connections and anchoring mechanisms to the outer concrete walls as a result of the dead wei,ht and seismic loads.

This is a Severity Level IV Violation.

Pursuant to the provisions of 10 CFR 2.201, Northeast Utilities Company is hereby required to submit to this of fice within thirty days of the date of the letter which transmitted this Notice a written statement or explanation in reply, including: (1) the corrective steps which have been taken and the results achieved; (2) the corrective steps which will be taken to avoid further violations; and (3) the date when full compliance will be achieved. Where good cause is shown, consideration will be given to extending this response time.

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OFFICIAL RECORD COPY MANOLY7/16/87 - 0003.0.0 08/14/87