ML20248L297
| ML20248L297 | |
| Person / Time | |
|---|---|
| Site: | Seabrook  |
| Issue date: | 03/12/1998 |
| From: | Feigenbaum T NORTH ATLANTIC ENERGY SERVICE CORP. (NAESCO) |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| RTR-NUREG-1431 NYN-98034, NUDOCS 9803190287 | |
| Download: ML20248L297 (2) | |
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u, North North Atlantic Energy Service Corporation P.O. Box 300
- d- (Ia ntic Seabrook, Nil 03874 l
(603) 474-952t The Northeast Utilities System March 12,1998 Docket No. 50-443 i
NYN-98034 United States Nuclear Regulatory Commission Attention: Document Control Desk Washington, DC 20555 Seabrook Station License Amendment Request 97-05 Additional Information North Atlantic Energy Service Corporation (North Atlantic) submitted License Amendment Request (LAR) 97-05 on September 26,1997 proposing revisions to Technical Specification 3.7.6 " Control Room Emergency Makeup and Filtration Subsystem". The proposed change separated the requirements for the Control Room HVAC System related to the operation of the Control Room Emergency Makeup Air and Filtration Subsystem from the Control Room Air Conditioning Subsystem. In addition, the proposed change increased the allowed outage time (AOT) for the air conditioning portion of the Control Room Air Conditioning Subsystem from 7 days to 30 days. The proposed changes are consistent with the requirements of NUREG 1431,
. Standard Technical Specifications, Westinghouse Plants.
The purpose of this letter is to provide the NRC Staff with information regarding our revised plans for modification and enhancement of the Control Room Air Conditioning Subsystem. In
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the description of the proposed changes, we stated that the proposed changes would facilitate on-line implementation of design enhancements to the Control Room Air Conditioning Subsystem. A80/
The modifications were described as involving the installation of a third ANS Safety Class 3 refrigeration compressor and modifications to the existing system to provide self-contained head pressure control and hot gas bypass valves, oil mitigation control and a more accurate means of measuring refrigerant charge. Subsequent to submitting LAR 97-05, Seabrook Station was in a-forced outage during December 1997-January 1998. During this outage, extensive modifications were made to the Control Building Air Conditioning Subsystem including installation of the head pressure control and hot gas bypass valves, oil mitigation controls and refrigerant charge measuring equipment. We have subsequently determined that the modifications made to date have greatly enhanced the performance of the system and that the installation of a third compressor is not the. most effective means of improving system operation and 9903190297 900312 PDR ADOCK 05000443
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U.S. Nuclear Regulatory Commission NYN-98034 / Page 2 reliability.'
Therefore, we have revised our plans and will continue to install system enhancements but are no longer pursuing the third compressor option. We are presently evaluating the installation of a non-safety chiller system to provide cooling to the Control Room when required in non-accident conditions.
We have reviewed LAR 97-05 and have concluded that the change in plans regarding the third compressor does not affect the proposed changes nor does it revise the conclusions of the significant hazards consideration.
Should you have any questions regarding this matter please contact Mr. Terry L. Harpster, Director of Licensing Services, at (603) 773-7765.
Very truly yours, NORTH ATLANTIC ENERGY SERVICE CORP.
h6 M/
Ted C. Feigenbaum /
Executive Vice President and Chief Nuclear Officer cc:
- i. J. Miller, NRC Region I Administrator C. V Smith, NRC Project Manager, Project Directorate 1-3 R. K. Locon, NRC Senior Resident Inspector 1