05000245/LER-1996-037, Forwards Supplemental LER 96-037-02 Which Documents an Event That Occurred at Mnps,Unit 1 on 960327,per 10CFR50.73(a)(2)(ii)

Forwards Supplemental LER 96-037-02 Which Documents an Event That Occurred at Mnps,Unit 1 on 960327,per 10CFR50.73(a)(2)(ii)

ML20136F860
Person / Time
Site:	Millstone
Issue date:	03/07/1997
From:	Noll W NORTHEAST NUCLEAR ENERGY CO., NORTHEAST UTILITIES SERVICE CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML20136F866	List: 05000245/LER-1996-037, Forwards Supplemental LER 96-037-02 Which Documents an Event That Occurred at Mnps,Unit 1 on 960327,per 10CFR50.73(a)(2)(ii)
References
B16091, NUDOCS 9703170089
Download: ML20136F860 (2)

LER-2096-037, Forwards Supplemental LER 96-037-02 Which Documents an Event That Occurred at Mnps,Unit 1 on 960327,per 10CFR50.73(a)(2)(ii)

Event date:
Report date:
2452096037R00 - NRC Website

text

4 .- 9 f errf . ooke 9 aI@ t Nuclear Energy shn,ione Noacu Power station Northeut Nudear Energy Company P.O. Box t WaterfordjJr %383 012r (860) 447 1791 Fax (860) 444 4077 The Northeast Utilities System March 7,1997 Docket No. 50-245 i Bl6091 Re: 10CFR50.73(a)(2)(ii)

U.S. Nuclear Regulatory Commission Document Control Desk Washington, DC 20555 This letter forwards supplemental Licensee Event Report (LER) 96-037-02, documenting an event that occurred at Millstone Nuclear Power Station, IJnit No.1 on March 27,1996. This supplemental LER is submitted pursuant to 10CFR50.73(a)(2)(ii). l Th'is supplemental report includes an additional reportable issue that was identified on February 5, 1997, as a result of the on-going investigations. As a result, Comn.? ment No. B15933-1 has been updated to include long-term cooling analysis.

The cause and the corrective actions for this event were not provided previously due to an engineering review of the Automatic Pressure Relief (APR) system that was first required. This supplemental report now documents the cause of the event as a result of the on-going evaluation of the APR system. The corrective actions are still being developed as the design basis review is being conducted. The design basis review program will include development of the single failure criteria document. The Commitment No. B15756-1 has been updated accordingly.

Also, the commitments have been moved from the LER form to this letter. Various other editorial changes made include replacing the use of" Automatic Depressurization System (ADS)"

with "APR, " as well as relocating the EIIS Codes to the end of the LER.

Following are Northeast Nuclear Energy Company's (NNECO's) commitments made within this ~-

letter. All other statements within this letter are for information only.

B15756-1 The on-going engineering review of the APR will be completed as part of the current design basis review program. The identification of required corrective actions will be finalized prior to startup for operating Cycle 16. The applicable corrective actions will be completed prior to startup for operating Cycle 16. The design basis review propm will include development of the single failure criteria document. A supplement to this LER will be submitted prior to startup for operating Cycle 16. ,p Y

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.h h 9703170089 970307 PDR ADOCK 050002453 l 5 PDR i

l . .

U.S. Nuclear Regulatory Commission I B16091\Page 2 of 2 I

I B15933-1 Upon resolution of ADS design issues, the small break loss of coolant accident and j long-term cooling analysis will be revised, if necessary, following the implementation i of the appropriate design changes.

l i

Very truly yours, y l

} NORTHEAST NUCLEAR ENERGY COMPANY For: P. D. Hinnenkamp j Director, Unit Operations i

By: W. G. Noll Manager, Operations a

t ,

f '

Attachment:

LER 96-037-02 cc: Dr. W. D. Travers, Director, Special Projects

}l H. J. Miller, Region 1 Administrator l

S. Dembek, NRC Project Manager, Millstone Unit No. I  !

T. A. Eastick, Senior Resident Inspector, Millstone Unit No.1 l l

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