ML20210H049
| ML20210H049 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 07/28/1999 |
| From: | Campbell G CENTERIOR ENERGY |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| Shared Package | |
| ML20210H053 | List: |
| References | |
| 2397, TAC-MA6092, NUDOCS 9908030264 | |
| Download: ML20210H049 (3) | |
Text
$h Davis-Besse Nudent Power Station 5501 North State Route 2 m
Oak Harbor. Ohio 43449-9760 Quy G. CampbeH 419-321-8580 Hoe President-Nudear fax: 419-a21El37 Docket Number 50-346 License Number NPF-3 Serial Number 2397 July 28, 1999 United States Nuclear Regulatory Commission Document Control Desk Washington, DC 20555-0001
Subject:
License Amendment Application to Revise Technical Specification 3/4.7.5.1, Ultimate Heat Sink (License Amendment Request No. 96-0008; TAC No. MA6092)
Ladies and Gentlemen:
Enclosed is an application for an amendment to the Davis-Besse Nuclear Power Station (DBNPS), Unit 1 Operating License Number NPF-3, Appendix A, Technical Specifications (TS). The proposed change involves TS 3/4.7.5.1, " Ultimate Heat Sink," which presently requires that the ultimate heat sink (UHS) average water temperature be s 85 F during plant Operating Modes I through 4. The proposed change would allow plant operation in these Modes with a water temperature s 90 *F. As described in the application, plant operation with this increased water temperature will have no adverse effect on plant systems and components important to safety. In addition, the post-accident containment pressure and temperature response due to the increased water temperature will remain within design parameters.
Lake Erie is the source of cooling water for the Service Water System. Lake water flows through an intake water system consisting of buried conduit to the intake canal. The intake canal flows to the UHS forebay, where the intake structure containing the service water pumps is located. Drawings showing the configuration of the intake canal and conduit are included in the enclosure.
During August,1995, due to an extended period of unusually hot weather, the average UHS temperature approached the TS limit of 85 'F. The DBNPS submitted a Request for Enforcement Discretion on August 17,1995 (DBNPS letter Serial Number 2318) to allow continued plant operation, in the event the UHS temperature continued to increase and the TS limit was exceeded, while an emergency license amendment request, subsequently submitted on August 18,1995 (DBNPS letter Serial Number 2319), was processed to change the UHS TS temperature limit to 90 F on a temporary basis.
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Docket Number 50-346 License Number NPF-3 Serial Number 2397 Page 2 j
i However, the UliS temperature did not exceed 85 'F, and following a gradual decline in the UliS temperature, the DBNPS withdrew the above requests by letter dated September 12,1995
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(DBNPS letter Serial Number 2326). The September 12,1995 letter noted that the DBNPS would be determining the feasibility of submitting a license amendment request for a permanent TS change for the UllS temperature limit.
The submittal of the follow-up license amendment request also involved resolution of an issue raised by the NRC during its review of the August 18,1995 submittal. In a letter dated
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October 12,1995 (DBNPS Log Number 4628), the NRC requested that the DBNPS provide j
information regarding the UHS maximum calculated water temperature and the Service Water System's maximum assumed constant inlet temperature used in the containment performance analysis for the DBNPS. The DBNPS provided a detailed response on January 31,1996 (DBNPS letter Serial Number 2347), in support ofits position that the design and licensing basis for the DBNPS containment performance analysis did not require consideration of the loss
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of either the UHS intake canal or connection to Lake Erie, concurrent with a Loss of Coolant Accident. The letter also presented the results of a seismic evaluation which demonstrated that the non-seismic Class I portions of the intake system were capable of :sisting the effects of a Safe Shutdown Earthquake with no loss of function.
On November 13,1997, the DBNPS staff met with the NRC staff to further discuss the DBNPS UHS licensing and design basis. The NRC staffindicated at the meeting that they would continue their review of the issues regarding the UHS. Subsequent to this meeting, the DBNPS staff advised the NRC staff ofits plans to perform a containment performance analysis that considered a loss of the connection to Lake Erie, in support of the license amendment application for an increase in the UHS temperature limit. This reanalysis was recently completed, and supports the enclosed license amendment application.
An UHS temperature approaching 85 F at the DBNPS is an extremely rare phenomenon.
Based on historical trends, the UHS temperature is unlikely to exceed the current TS limit of 85 F, however, this cannot be assured with a high degree of certainty. Should the UHS temperature approach 85 F later this year, the DBNPS would request that the enclosed license amendment application be approved and issued as an emergency or exigent license amendment, in the manner allowed by 10 CFR 50.91(a). Should this situation not develop, the DBNPS requests that this license amendment application be approved by February 1,2000.
Docket Number 50-346 License Number NPF-3 Serial Number 2397 Page 3 Should you have any questions or require additional information, please contact Mr. James L. Freels, Manager - Regulatory Affairs, at (419) 321-8466.
Very truly yours, MKUlaj Enclosures cc:
S. N. Bailey, NRC/NRR Project Manager J. E. Dyer, Regional Administrator, NRC Region III J. R. Williams, Executive Director, Ohio Emergency Management Agency, State of Ohio (NRC Liaison)
K. S. Zellers, NRC Region 111, DB-1 Senior Resident Inspector Utility Radiological Safety Board O