ML101650199
| ML101650199 | |
| Person / Time | |
|---|---|
| Site: | Watts Bar  |
| Issue date: | 06/11/2010 |
| From: | Office of Nuclear Reactor Regulation |
| To: | Division of Operating Reactor Licensing |
| References | |
| Download: ML101650199 (4) | |
Text
1 WBN2Public Resource From:
Lamb, John Sent:
Friday, June 11, 2010 8:32 AM To:
Arent, Gordon; wdcrouch@tva.gov Cc:
WBN2HearingFile Resource; Wiebe, Joel; Raghavan, Rags; Haag, Robert; Milano, Patrick; Campbell, Stephen
Subject:
For Your Review - Watts Bar Unit 2 - Preliminary RAIs - SBPB - FSAR 9.1 Attachments:
Preliminary SBPB RAIs - Watts Bar 2 Sect 9_1 Amend 97 RAIs (2).doc Gordon & Bill, Attached, for your review, is preliminary Request for Additional Information (RAI) questions regarding Watts Bar Nuclear Plant (WBN), Unit 2. Please review to ensure that the RAI questions are understandable, the regulatory basis is clear, there is no proprietary information contained in the RAI, and to determine if the information was previously docketed. Please also let me know how much time Tennessee Valley Authority (TVA) needs to respond to the RAI questions.
Thanks.
John
Hearing Identifier:
Watts_Bar_2_Operating_LA_Public Email Number:
34 Mail Envelope Properties (BE1CC4A72435624D84F8699734202B3E1FAC07F9F1)
Subject:
For Your Review - Watts Bar Unit 2 - Preliminary RAIs - SBPB - FSAR 9.1 Sent Date:
6/11/2010 8:32:05 AM Received Date:
6/11/2010 8:32:10 AM From:
Lamb, John Created By:
John.Lamb@nrc.gov Recipients:
"WBN2HearingFile Resource" <WBN2HearingFile.Resource@nrc.gov>
Tracking Status: None "Wiebe, Joel" <Joel.Wiebe@nrc.gov>
Tracking Status: None "Raghavan, Rags" <Rags.Raghavan@nrc.gov>
Tracking Status: None "Haag, Robert" <Robert.Haag@nrc.gov>
Tracking Status: None "Milano, Patrick" <Patrick.Milano@nrc.gov>
Tracking Status: None "Campbell, Stephen" <Stephen.Campbell@nrc.gov>
Tracking Status: None "Arent, Gordon" <garent@tva.gov>
Tracking Status: None "wdcrouch@tva.gov" <wdcrouch@tva.gov>
Tracking Status: None Post Office:
HQCLSTR01.nrc.gov Files Size Date & Time MESSAGE 524 6/11/2010 8:32:10 AM Preliminary SBPB RAIs - Watts Bar 2 Sect 9_1 Amend 97 RAIs (2).doc 33786 Options Priority:
Standard Return Notification:
No Reply Requested:
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Recipients Received:
PRELIMINARY REQUEST FOR ADDITIONAL INFORMATION FINAL SAFETY ANALYSIS REPORT SECTION 9.1, FUEL STORAGE AND HANDLING UPDATES THROUGH AMENDMENT 97 TENNESSEE VALLEY AUTHORITY WATTS BAR NUCLEAR PLANT, UNIT 2 DOCKET NO.05-391 Below, for your review, is preliminary Request for Additional Information (RAI) questions regarding Watts Bar Nuclear Plant (WBN), Unit 2. Please review to ensure that the RAI questions are understandable, the regulatory basis is clear, there is no proprietary information contained in the RAI, and to determine if the information was previously docketed. Please also let me know how much time Tennessee Valley Authority (TVA) needs to respond to the RAI questions.
By letter dated January 11, 2010 (Agencywide Documents Access and Management System Accession No. ML100191686), TVA submitted Final Safety Analysis Report (FSAR)
Amendment No. 97 for WBN Unit 2. The U.S. Nuclear Regulatory Commission (NRC) staff has reviewed the information provided by the TVA in FSAR Amendment No. 97.
Background:
Many of the fuel storage and handling related structures, systems, and components within the WBN Auxiliary Building are shared between the two units, including the spent fuel pool, the spent fuel cooling and cleanup system, and the spent fuel handling equipment. The WBN Unit 2 FSAR describes the degree of conformance with the NRC General Design Criteria (GDC) of 10 CFR Part 50, Appendix A. The ability of shared systems to perform their safety functions for credible combinations of normal and accident states is addressed in GDC 5.
Pursuant to the requirements of 10 CFR 50.34(b), applicants for operating licenses must include in the FSAR a description and analysis of the structures, systems, and components of the facility, and the evaluations required to show that safety functions will be accomplished.
RAI 1
The NRC issued Amendment Nos. 40, 48, 67, and 77 to WBN Unit 1 operating license on September 23, 2002 (ML022540925), October 8, 2003 (ML032880062), January 18, 2008 (ML073520546), and May 4, 2009 (ML090920506). These amendments authorized irradiation of tritium production burnable absorber rods (TPBARs) within WBN Unit 1 core and transfer of these irradiated TPBARs through the shared WBN spent fuel pool. In granting these amendments, the NRC staff considered evaluations of the effect of storage of these TPBARs within the shared WBN spent fuel pool on heat generation and criticality prevention. However, the WBN Unit 2 FSAR through Amendment No.
97 does not address the presence of the TPBARs within the shared spent fuel pit and the effect of these TPBARs on safety functions related to fuel storage.
Update the FSAR to provide appropriate information demonstrating that safety
functions would be accomplished considering the effects of TPBAR storage in the shared spent fuel pool.
RAI 2
Section 9.1.3.3.3, Pool and Fuel Temperatures, of the WBN Unit 2 FSAR describes that, with a 12 day decay time, the maximum heat load associated with a full core discharge is 28.1E+06 Btu/hr while the maximum heat load for a full core discharge following a normal refueling outage case is 32.6E+06 Btu/hr. This statement is essentially identical to the corresponding Section of the WBN 1 Updated Safety Analysis Report, which was potentially based solely on operation of WBN Unit 1. Since the operation of a second unit would increase the frequency of fuel discharges to the spent fuel pool, the heat load values may not be representative of dual-unit operating conditions. Confirm the expected heat loads for representative dual-unit scenarios and describe the methodology, including decay heat models, used to determine the heat load.
RAI 3
Address intentions with regard to implementation of the guidelines in NEI 08-05, Industry Initiative for Control of Heavy Loads, for WBN Unit 2.