05000245/LER-1996-031, Forwards LER 96-031-01.Util Commits That All DC Circuits within Fuse Control Program Will Have Fuses W/Properly Certified DC Rating Prior to Startup for Operating Cycle 16

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Forwards LER 96-031-01.Util Commits That All DC Circuits within Fuse Control Program Will Have Fuses W/Properly Certified DC Rating Prior to Startup for Operating Cycle 16
ML20132C673
Person / Time
Site: Millstone Dominion icon.png
Issue date: 12/16/1996
From: Hinnenkamp P
NORTHEAST NUCLEAR ENERGY CO., NORTHEAST UTILITIES SERVICE CO.
To:
NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML20132C678 List:
References
B16038, NUDOCS 9612180437
Download: ML20132C673 (1)


LER-2096-031, Forwards LER 96-031-01.Util Commits That All DC Circuits within Fuse Control Program Will Have Fuses W/Properly Certified DC Rating Prior to Startup for Operating Cycle 16
Event date:
Report date:
2452096031R00 - NRC Website

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. Northeast Male- omm . % rerry na, nern,ra, er 1 . Utilities System r.o. % i28

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(203) 447 1791 December 16,1996 Docket No.' 50-245 i B16038 Re
10CFR50.73 U.S. Nuclear Regulatory Commission e Document Control Desk Washington, DC 20555 4

This letter' forwards supplementti Licensee Event Report (LER) 96-031-01, documenting an

! event that occurred at Millstone Nuclear Power Station, Unit No.1 on April 25,1996. This LER l

!- was originally submitted pursuant to' 10CFR50.73(a)(2)(i), 10CFR50.73(a)(2)(ii),

10CFR50.73(a)(2)(v), and 10CFR50.73(a)(2)(vii).

1 Upon' further investigations, it has been determined that this event is not reportable. This supplement documents the additional findings from testing that was performed. While the actual fuse breakdown voltage was not achieved during the testing, the ability of the fuses to operate at DC voltages above the maximum possible bus voltage provides assurance that overcurrent protection was always present. There is no additional testing planned and the Commitment B15714-2 is closed. There are no revision bars on the LER since there are extensive changes.

i The Commitments section has been moved from the LER form to this letter. The following is

Northeast Nuclear Energy Company's (NNECO's) commitment contained within this letter. All
j. other statements made within this letter are for information only.

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B15714-1 NNECO commits that all DC circuits within the Fuse Control Program will have F fuses with properly certified DC ratings prior to startup for operating cycle 16.

I j Very tmly yours, NORTHEAST NUCLEAR ENERGY COMPANY f

. . NL ~nm o J Q P. DIHinnenkamp V l 9612190437 961216 ,

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PDR ADOCK 05000245 Director, Unit Operations 8 -PDR-

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Attachment:

LER 96-031-01 {s )')

cc: Dr. W. D. Travers, Director, Special Projects 4

H. J. Miller, Region I Administrator

S. Dembek, NRC Project Manager, Millstone Unit No.1 T. A. Eastick, Senior Resident Inspector, Millstone Unit No.1 083422 9 REY.1 %

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