ML13037A326
| ML13037A326 | |
| Person / Time | |
|---|---|
| Site: | Watts Bar  |
| Issue date: | 01/31/2013 |
| From: | James Shea Tennessee Valley Authority |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| TAC ME8200, WBN-UFSAR-12-01 | |
| Download: ML13037A326 (3) | |
Text
Tennessee Valley Authority, 1101 Market Street, Chattanooga, Tennessee 37402 January 31, 2013 10 CFR 50.90 ATTN: Document Control Desk U.S. Nuclear Regulatory Commission Washington, D.C. 20555-0001 Watts Bar Nuclear Plant Unit 1 Facility Operating License No. NPF-90 NRC Docket No. 50-390
Subject:
Submittal Date for Supplement to Application to Revise Watts Bar Nuclear Plant Unit I Updated Final Safety Analysis Report Regarding Changes to Hydrologic Analysis (WBN-UFSAR-12-01)
References:
- 1. Tennessee Valley Authority (TVA) Submittal to NRC Document Control Desk, "Application to Revise Watts Bar Nuclear Plant Unit 1 Updated Final Safety Analysis Report Regarding Changes to Hydrologic Analysis, TAC No. ME8200 (WBN-UFSAR-12-01)," dated July 19, 2012 (ADAMS Accession No. ML12236A167)
- 2. NRC Meeting Summary, "Summary of December 13, 2012, Management Meeting with Tennessee Valley Authority on the Status of Hydrology,"
dated January 11, 2013 (Accession No. ML13010A137)
In the Reference 1 letter, Tennessee Valley Authority (TVA) submitted a request for an amendment to Facility Operating License No. NPF-90 for Watts Bar Nuclear Plant (WBN)
Unit 1. This license amendment request seeks approval to revise the WBN Unit 1 Updated Final Safety Analysis Report (UFSAR) to adopt a revised hydrologic analysis for the WBN Unit 1 site.
In the submittal, TVA identified the WBN Unit 1 Thermal Barrier Booster (TBB) Pump Motors as the most limiting components affected by the updated design basis flood (DBF) level of elevation 739.7 ft in the Auxiliary Building.
Recently TVA has identified that the chilled water circulating pump motors for the Main Control Room (MCR) Chillers and the 6.9kV Shutdown Board Room (SDBR) Chillers located on Auxiliary Building floor elevation 737.0 ft. and ancillary equipment may also be affected (partially submerged) during a DBF event. As discussed in the December 13, 2012 meeting with the NRC (Reference 2), TVA presented plans to update the license amendment request Printed on recycled paper
U.S. Nuclear Regulatory Commission Page 2 January 31, 2013 by January 31, 2013 to add information addressing the impact of the updated hydrologic analysis for WBN Unit 1 on these components required for flood mode operation. In this letter, TVA is providing a new date of March 1, 2013 to provide this supplemental information. This time is necessary to allow for completion and required internal TVA reviews of the supplemental information to be provided.
TVA has determined that this additional information will not affect the technical changes proposed to the WBN Unit 1 UFSAR and should not alter the NRC findings regarding the technical adequacy, regulatory compliance, and impact on the health and safety of the public of the proposed changes.
In accordance with 10 CFR 50.91 (b)(1), TVA is sending a copy of this letter and the enclosure to the Tennessee Department of Environment and Conservation. contains a list of new regulatory commitments in this letter. Please address any questions regarding this request to Terry Cribbe at 423-751-3850.
- .w
.Shea Vic President, Nuclear Licensing
Enclosure:
- 1. List of New Regulatory Commitments cc (Enclosure):
NRC Regional Administrator - Region II NRC Senior Resident Inspector-Watts Bar Nuclear Plant, Unit 1 Director, Division of Radiological Health - Tennessee State Department of Environment and Conservation
ENCLOSURE1I LIST OF COMMITMENTS
- 1. By March 1, 2013, TVA will submit supplemental information to the WBN Unit 1 license amendment request submitted July 19, 2012, addressing the effect of the updated hydrologic analysis for WBN Unit 1 on the Main Control Room (MCR) Chillers and the 6.9kV Shutdown Board Room (SDBR) Chillers.
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