05000336/LER-1996-031, Forwards LER 96-031-00 Which Documents Event That Occurred at Mnps,Unit 2 on 961003.Commitments,listed

Forwards LER 96-031-00 Which Documents Event That Occurred at Mnps,Unit 2 on 961003.Commitments,listed

ML20134H080
Person / Time
Site:	Millstone
Issue date:	11/04/1996
From:	Richardson P NORTHEAST NUCLEAR ENERGY CO., NORTHEAST UTILITIES SERVICE CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML20134H082	List: 05000336/LER-1996-031, Forwards LER 96-031-00 Which Documents Event That Occurred at Mnps,Unit 2 on 961003.Commitments,listed 05000336/LER-1996-031-02, :on 961003,potentially non-conservative Assumptions Were Identified in Analysis for Single MSIV Closure.Caused by Analysis of Secondary Side Peak Pressures. Review & Analysis of Event Is Continuing
References
B15975, NUDOCS 9611130521
Download: ML20134H080 (2)

LER-1996-031, Forwards LER 96-031-00 Which Documents Event That Occurred at Mnps,Unit 2 on 961003.Commitments,listed

Event date:
Report date:
Reporting criterion:	10 CFR 50.73(a)(2)(ii)(B), Unanalyzed Condition
3361996031R00 - NRC Website

text

"*g. gggg 107 Selden Street, Berlin, CT %037 Utilities $ystem Northeast Utilities Sede Company P.o. Box 270 l

Ilartford, CT 06141-0270 (203) 665-5000 November 4,1996 Docket No. 50-336 B15975 l

Re: 10 CFR 50.73(a)(2)(ii)(B)

U.S. Nuclear Regulatory Commission Document Control Desk Washington, DC 20555 This letter fonuards Licensee Event Report (LER) 96-031-00, documenting an event that i

occurred at Millstone Nuclear Power Station, Unit No. 2 on October 3,1996. This LER is being l

submitted pursuant to 10 CFR 50.73(a)(2)(ii)(B).

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The following are NNECO's commitments made within this letter. All other statements made within this letter are for information only.

B15975-01:

The review and analysis of this event is continuing. Efforts are ongoing to reanalyze the peak secondary side pressure for a Single MSIV Closure Event. The reanalysis of the design basis event will resolve the conditions described in this LER. The consequences of these potentially non-conservative assumptions on other design basis events will also be reviewed. As a result of the reanalyses, l

appropriate corrective actions will be implemented prior to restart to ensure that the plant response to these events is adequate.

l' B15975-02:

A supplemental LER will be issued to provide the results of the reanalyses and the resultant corrective actions before March 1, 1997.

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Very truly yours, l

NORTHEAST NUCLEAR ENERGY COMPANY l

bb P. M'. Richardson

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mna gQ,[,

9611130521 961104 Director-Millstone Unit No. 2 PDR ADOCK 05000336 S

PDR 4.5*e page 2 l

U. S. Nucipar Reguistory Commission B15975/Paga 2

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Attachment: LER 96-031-00 cc:

H. J. Miller, Region I Administrator D. P. Beaulieu, Resident Inspector, Millstone Unit No. 2 D. G. Mcdonald, Jr., NRC Project Manager, Millstone Unit No. 2 i

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