05000423/LER-1996-040, Discusses LER 96-040-00, Potential Component Cooling Water Sys Overcooling Due to Loss of Instrument Air Sys Concurrent W/Low Svc Water Inlet Temp. Revised Commitment Provided in Encl

Discusses LER 96-040-00, Potential Component Cooling Water Sys Overcooling Due to Loss of Instrument Air Sys Concurrent W/Low Svc Water Inlet Temp. Revised Commitment Provided in Encl

ML20203D826
Person / Time
Site:	Millstone
Issue date:	12/08/1997
From:	Hicks G NORTHEAST NUCLEAR ENERGY CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
B16897, NUDOCS 9712160302
Download: ML20203D826 (4)

LER-2096-040, Discusses LER 96-040-00, Potential Component Cooling Water Sys Overcooling Due to Loss of Instrument Air Sys Concurrent W/Low Svc Water Inlet Temp. Revised Commitment Provided in Encl

Event date:
Report date:
4232096040R00 - NRC Website

text

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.. P.o. Pos 128 Taterford. cT 06385-0128 (860) 447 1791 Fan (860) 444 4277 W Northeast Utihties System Docket No. 50-423 B16897 December 8,1997 RE: LER 96-040-00 U.S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, DC 20555 Millstone Nuclear Power Station Unit No. 3 Revision Of Commitment to Install Temporary Modification to Component Coolina Water System Prior to Service Water System inlet Temperatures Fallina Below 45 Dearees Licensee Event Report (LER)96-040 00, " Potential Component Cooling Water System Overcooling Due to Loss of Instrument Air System Concurrent with Low Service Water Inlet Temperature," committed to implementing the followl.19 short inlet temperature decreasing term correctiva action prior to Service to below approximately 45 degrees Fahrenheit Wator "The(Sy( three-way F): CCP heat exchanger outlet temperature control valve actuators will be modified (e.g., stem clamps) so that the valves will not fail in a maximum cooling configuration on loss of instrument air in Modes 5 or 6."

A temporary modification was installed in the CCP System in December 1996.

As the Long Island Sound water temperature increased in the Spring, operation with the temporary modification was no longer required to maintLin operability.

This resulted in a May 17,1997, NRC commitment change letter to remove the temporary modification during the non-Winter months with the intent of reinstalling the temporary modification prior to the SW inlet water temperatures falling below 45 F if the CCP operability issue had not been resolved. This revised commitment stated: "The Reactor Plant Comp'onent Cooling Water 1 (CCP) system will be temporarily modified prior to Service Water (SW) inlet I

temperatures falling below 45 F." .

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. I U.S. Nucle:r R:gulitcry Commission B16897\Page 2  ;

Currgntly, several significant CCP system design modifications and an

• operability determination have been completed which ensure CCP operability down to the minimum (330 F) design SW inlet water temperature. As such, a temporary modification is no longer necessary to compensate for component overcooling effects resulting from low (less than 45 F) SW inlet water '

- temperatures. Tne final design modifications, to be completed prior to entering 4

mode 4, are in progress to qualify the CCP system to the minimum inlet temperature for subsequent operating modes; j Our revised commitment is provided in Attachment 1. Should you have any i questions regarding this matter please contact Mr. David A. Smith at (860) 437-

5840. 1 Very truly yours, .

NORTHEAST NUCLEAR ENERGY l COMPANY

-C s i I

~

. HTks Director - Millstone Unit 3 4 .

Attachment:

1) NNECO's revised commitment in response to LER 96-040-00 cc: H. J. Miller, Region i Administrator W.D. Travers, PhD, Director, Special Proje. cts Oh e ,

J. W. Andersen, NRC Project Manager, hillstone Unit No. 3 A. C. Cerne, Senior Resident inspector, Millstone Unit No. 3 ,

CA Group Files (CR M3-96-0887) e SCN:Sn l

l l'

t Docket No 50-423  !

B16897 l

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Attachment 1  ;

Millstone Nuclear Power Station Unit No. 3 i' Revision of commitment to Install Temocrary Modification to component Coolina Water System Prior to Service Water System Inlet Temperatures Fallina

Below 45 Dearees j t

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December 1997  ;

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• Enclosure  ;

List of Regulatory Commitments  !

l The following table identifies those actions committed to by NNECO in this document. Please notify the Manager . Nuclear Licensing at the Millstone Nuclear Power Station Unit No. 3 of any questions regarding this document or ,

any associated regulatory commitments,

] ,

h Committed Date or Number Commitment Outage _ '

- B15988-01 The Reactor Plant Component Prior to Entry into

]

Cool;ng Water (CCP) system will be Modu 4 operated in accordance with the requirements set forth in the operability determination until the

required supports are released to Operations at which time, the' system l will be fully qualified. -

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