ML20062B718
| ML20062B718 | |
| Person / Time | |
|---|---|
| Site: | Seabrook  |
| Issue date: | 10/19/1990 |
| From: | Feigenbaum T PUBLIC SERVICE CO. OF NEW HAMPSHIRE |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| Shared Package | |
| ML20062B723 | List: |
| References | |
| NYN-90187, NUDOCS 9010260094 | |
| Download: ML20062B718 (3) | |
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New Hampshire Yh Tesi C. Feigenbaum President and Chief becutive Officer -
NYN 90187 October 19, 1990 United States Nuclear Regulatory Commission Washington, D.C.
20555 Attention:
Document Control Desk
References:
Facility Operating License No. NPF 86, Docket No. 50 443
Subject:
Request for License Amendment; Battery Surveillance Requirements Gentlemen:
t Pursuant to 10 CFR 50.90, New Hampshire Yankee (NHY) hereby proposes to amend the Seabrook Station Operating License (Facility Operating License NPF 86) by incorporating the proposed changes, provided herein as Enclosure 1, into the Seabrook Station Technical Specifications. These proposed changes will delete the requirement that certain surveillance tests be performed during shutdown.
The basis for this proposed change is provided in Enclosure 2, which includes a safety evaluation of the proposed changes. Based upon the information contained in Enclosure 2, NHY has concluded that the proposed change does not involve an Unreviewed Safety Question pursuant to 10 CFR 50.59, nor does it involve a Significant Hazards Consideration pursuant to 10 CFR 50.92, i
New Hampshire Yankee has reviewed the proposed change in accordance with the criteria specified in 10 CFR 50.92 and has determined that the proposed change would not 1.
Involve a significant increase in the probability or consequences of any accident previously evaluated. The proposed change deletes the requirement that certain surveillances be performed 'during shutdown". The Seabrook design for vital
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DC systems incorporates two 100% capacity battery banks for each train, i
Technical Specifications currently allow one battery bank in one train to be inoperable for up to 30 days. Removal of one battery bank in one train from service for the performance of surveillance testing does not decrease.the functional capability of the DC system below the level currently allowed by the Technical Specifications.
Additionally, in accordance with Technical Specification requirements, both battery banks and chargers in the opposite
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P.O. Box 300
- Seabrook, NH 03874
- Telephone (603) 474 9521 F,lI l
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United States Nuclear Regulatory Commission October 19, 1990 Attention: Document Control Desk Page two train will be OPERABLE during the performance of this testing. Performance j
of the surveillance testing at power with the battery removed from service will not affect any other system, structure or componentt therefore, the proposed i
change does not increase the probability of an accident previously evaluated.
Assuming an additional single failure (eg, failure of the opposite DC train),
a minimum of one 100% capacity battery bank will remain available during any j
postulated accident. With this minimum capability, sufficient instrumentation and control capability exists for monitoring and maintaining the unit status following an accident. Therefore, the consequences of an accident previously evaluated will not be increased, t
2.
Create the possibility of a new or different kind of accident from any previously evaluated. During the performance of this testing, the battery will be isolated from the vital DC system. No other system will be affected by this testing.
Additionally, in accordance with the Technicci Specifications, the alternate battery of the same train and both opposite train batteries will remain OPERABLE during this testing.
Therefore, the possibility of an accident of a different type than any previously evaluated is not created by this change.
3.
Involve a significant reduction in a margin of safety. The Seabrook design incorporates two 100% capacity battery banks for each train; removing a battery bank from service while operating will not decrease the functional or safety capabilities of the DC system below the level currently specified by the Technical Specifications. The allowed outage time for the battery banks is based upon the guidance of Regulatory NJe 1.93. Though the Regulatory Guide indicates that a battery should only be removed from service for the performance of corrective maintenance, the recommendations of this Regulatory Guide are based upon a system design encompassing only 100% capacity per train. With a battery bank removed from service, the affected train continues to meet assumed 100% capacity. Therefore, the proposed change does not reduce the margin of safety for any Technical Specification.
New Hampshire Yankee respectfully reques's approval of these proposed changes by December 7,1990 to afford continued uninterrupttd plant operation without compromising our ability to perform the surveillance testing of the batteries prior to expiration of the allowed surveillance intervals. New Hampshire Yankee believes that this schedule provides sufficient time for both NHY and NRC to preclude exceedance of the surveillance interval and to perform the testing without need for regulatory relief.
Should you have any questions regarding this request, please contact Mr. Terry L.
Harpster, Director of Licensing Services, at (603) 474 9521, extension 2765.
Very truly yours,,
WW A Af Ted C. Feigenbaum t
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United States Nuclear Regulatory Commission October 19, 1990 Attention: Document Control Desk Page three i
cc:
Mr. Thomas T. Martin Regional Administrator United States Nuclear Regulatory Commission Region 1 475 Allendale Road King of Prussia, PA 19406 Mr. George L. Iverson, Director Office of Emergency Management State Office Park South 107 Pleasant Street Concord, NH 03301 Mr. Victor Nerses, Sr. Project Mgr.
Project Directorate I 3 Division of Reactor Projects U. S. Nuclear Regulatory Commission Washington, DC 20555 Mr. Noel Dudley NRC Senior Resident Inspector I
P.O. Box 1149 Seabrook, Nil 03874 i
i Enclosure (s)
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