ML20059J862
| ML20059J862 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 09/12/1990 |
| From: | Wessman R Office of Nuclear Reactor Regulation |
| To: | Mroczka E CONNECTICUT YANKEE ATOMIC POWER CO. |
| References | |
| TAC-77556, NUDOCS 9009210006 | |
| Download: ML20059J862 (5) | |
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NUCLEAR REGULATORY COMMISSION UNITED STATES l
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September 12, 1990 Docket No. 50-245
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Mr. Edward J. Mroczka l
Senior Vice President i
Nucl ea r; Engi nee ri ng : and. 0pe rati ons.
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Connecticut Yankee Atomic Power Company i.
i Northeast Nuclear Energy Company' P. O. Box 270 Hartford, Connecticut 06141-0270
Dear Mr. Mroczka:
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SUBJECT:
TEMPORARY WAIVER OF COMPLIANCE RELATED.TO CONTAINMENT SPRAY-INTERLOCK - MILLSTONE NUCLEAR POWER STATION, UNIT NO..1 (TAC NO. 77556)
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c This responds to your September II,1990, letter requesting a temporary waiver of compliance from the Millstone Nuclear Power Station, Unit No. 1. Technical Specification Table 3.2.2.
The waiver was requested to permit a return to.
reactor operation while-the NRC staff processed'an emergency change to Table t
3.2.2 of the Technical' Specifications.
The proposed change would modify the-containment spray interlock trip level setting from between'4.5'and 5.5 psig i
to between 9 and 10 psig to assure adequate not positive suction head (NPSH) for a single low pressure coolant injection pump P]CI).in the containment-e cooling mode.
This change is necessitated by' flow limitations of the LPCI l
heat exchangers--which require that one,of-the two pumps in the LPCI train, that is placed in the containment spray modo, to be tripped..-To meet contain-ment cooling requirements, the LPCI pump must operate at a higher'flowrate, 1
requiring a higher NPSH.
The minimum NPSH required for successful pump-operation will be assured by the proposed change in the Technical'$pecification
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containment spray interlock trip level setting.. This' change ~has no effect on the injection mode of LPCI.
After a careful consideration of your request,.the NRC has ' concluded that allowing Millstone Unit 1 to return to power operations while the emergency.
l Technical Specification change is being processed, will have a negligible effect on reactor safety.
The'11censee will operate Millstone Unit 1 with i
the new containment spray interlock trip level setting and the associated procedures in place.
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Mr,. Edward J. Hroczka
-2 September 12, 1990 i
A temporary waiver of compliance was granted allowing restart of Millstone Unit 1, as discussed by Messrs. W. Butler and J. Stolz of this office and by Messrs. E. Wenzinger and D. Haverkamp of the NRC's Region I office on Septe.nber 11, 1990. The waiver was granted for the period of time necessary to process the emergency Technical Specification change.
Sincerely, Richard Wessman, Acting Assistant Director for Region I Reactors Division of Reactor Projects - I/II Office of Nuclear Reactor Regulation l
cc: See next page t
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i Mr. Edward J. Mroczke. September 12, 1990 i
A temporary waiver of compliance was granted allowing restart of Millstone Unit 1, as dircussed by Messrs. W. Butler and J. Stolz of this office and by Messrs. E. Wenzinger and D. Haverkamp of the NRC's Region I office on September 11, 1990. The waiver was granted for the period of time necessary to process the emergency Technical Specification change.
Sincerely, j
original signed by Walter Butler for Richard Wessman Richard Wessman, Acting Assistant Director for Region I Reactors Division of Reactor Projects - 1/II Office of Nuclear Reactor Regulation cc: See next page i
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e Mr. Edward J. Mroczka Millstone Nuclear Power Station Northeast Nuclear Energy Company Unit No. 1 CC:
Gerald Garfield, F, squire R. M. Kacich, Manager Day. Berry and Howard Generation Facilities Licensing Counselors et Law Northeast Utilities Service Company City Place
- Post Office Box 270 i
Hartford, Connecticut 06'03-3499 Hartford, Connecticut 06141-0270 W. D. Ronterg, Vice President.
D. O. Nordquist Nuclear Operations Director of Quality Services Northeast Utilities Service Company Northeast Utilities Service Company Post Office Box 270 Post Office Box 270 Hartford, Connectiev'. 06141-0270 Hartford, Connecticut 06141-0270 Kevin McCarthy, Director Regional Administrator Radiation Control Unit Region I Department of Environmental Protection U. S. Nuclear Regulatory Comission State Office Building 475 Allendale Road Hartford, Connecticut 06106 King o. Prussia Pennsylvania 19406 Bradford S. Chase, Under Secretary First Selectmen Energy Division Town of Waterford Office of Policy and Management Hall of Records 80 Washington Street 200 Boston Post Road i
Hartford, Connecticut 06106 Waterford, Connecticut 06385 S. E. Scace, Nuclear Station Director W. J. Raymond, Resident Inspector Millstone Nuclear Power Station Millstone Nuclear Power Station Northeast Nuclear Energy Company c/o U. S. Muclear Regulatory Comission Post Office Box 128 Post Office Box Bil Waterford, Connecticut 06385 Niantic, Connecticut 06357 l
J. P. Stetz, Nuclear Unit Director Millstone Unit No. 1 Northeast Nuclear Energy Company Post Office Box 128 Waterford, Connecticut 06385 I
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