ML091270692
| ML091270692 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 05/12/2009 |
| From: | David Wright Plant Licensing Branch II |
| To: | Christian D Virginia Electric & Power Co (VEPCO) |
| Wright D, NRR/DORL, 301-415 -1864 | |
| References | |
| TAC ME0264, TAC ME0265, TSTF-490 | |
| Download: ML091270692 (3) | |
Text
UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 l"1ay 12, 2009 Mr. David A. Christian President and Chief Nuclear Officer Virginia Electric and Power Company Innsbrook Technical Center 5000 Dominion Boulevard Glen Allen, VA 23060-6711
SUBJECT:
NORTH ANNA POWER STATION, UNIT NOS. 1 AND 2, REQUEST FOR ADDITIONAL INFORMATION (RAI) REGARDING PROPOSED LICENSE AMENDMENT REQUEST TO ADOPT TSTF-490, "DELETION OF E BAR DEFINITION AND REVISION TO RCS [REACTOR COOLANT SYSTEM]
SPECIFIC ACTIVITY" (TAC NOS. ME0264 AND ME0265)
Dear Mr. Christian:
By letter dated December 17, 2008, Virginia Electric and Power Company submitted a license amendment request to adopt TSTF-490, "Deletion of E Bar Definition and Revision to RCS Specific Activity," for North Anna Power Station, Unit Nos. 1 and 2. The proposed changes would replace the current Technical Specification 3.4.16 limit on RCS gross specific activity with a new limit on RCS noble gas specific activity. The noble gas specific activity limit would be based on a new dose equivalent XE-133 definition that would replace the current E Bar average disintegration energy definition.
The Nuclear Regulatory Commission staff discussed the draft RAI with your staff on April 30, 2009.
Enclosed is the final RAI. Please provide a response within 30 days of the date of this letter.
Please contact me at (301) 415-1864 if you have any questions.
Sincerely, P~.WM:A-Donna N. Wrig~, P~ct Manager Plant Licensing Branch 11-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket l\\Ios. 50-338 and 50-339
Enclosure:
RAJ cc w/encl: Distribution via Listserv
REQUEST FOR ADDITIONAL INFORMATION REGARDING PROPOSED LICENSE AMENDMENT REQUEST APPLICATION TO ADOPT TSTF-490 VIRGINIA ELECTRIC AND POWER COMPANY NORTH ANNA POWER STATION, UNIT NOS. 1 AND 2 DOCKET NOS. 50-338 AND 50-339 By letter dated December 17,2008, (Agencywide Documents Access and Management System Accession No. ML083530982) Virginia Electric and Power Company, (the licensee) submitted a license amendment request to adopt TSTF-490, "Deletion of E Bar definition and revision to RCS
[Reactor Coolant System] specific activity," for North Anna Power Station, Unit l\\Ios. 1 and 2 (North Anna 1 and 2). The Nuclear Regulatory Commission (NRC) staff has reviewed the information the licensee submitted and determined that the following additional information is required to complete the evaluation.
Proposed inserts 1 and 2 contained in the letter dated December 17, 2008, provide definitions for "dose equivalent 1-131" (DEI) and "dose equivalent Xe-133" (DEX). These definitions indicate that DEI and DEX may be determined using several references for dose conversion factors (DCFs).
However, the purpose of the limiting condition for operation (LCO) for DEI and DEX is to satisfy Title 10 of the Code of Federal Regulations (10 CFR), Part 50, Section 50.36, Criterion 2, which establishes an operating restriction that is an initial condition of a design basis accident (DBA).
When surveillance of the RCS radionuclides is performed, each acceptable set of DCFs will yield a different DEI and DEX. As approved by the NRC staff, the intent of TSTF-490 was to allow the licensee to select, from the acceptable list, one DCF reference for the calculation of DEI, and one DCF reference for the calculation of DEX. Consistent with 10 CFR 50.36 and TSTF-490, the licensee should specify one DCF reference for each definition, which will be consistent with the specified LCO and DBA analysis, or justify why a list of several DCFs is consistent with the specified LCO and DBA analysis.
Therefore, please justify how the use of multiple DCFs maintains consistency with the specified LCO values and DBA analyses, or provide a revised definition that incorporates the DCFs appropriate for the North Anna 1 and 2 technical specifications.
Enclosure
May 12, 2009 Mr. David A. Christian President and Chief Nuclear Officer Virginia Electric and Power Company Innsbrook Technical Center 5000 Dominion Boulevard Glen Allen, VA 23060-6711
SUBJECT:
NORTH ANNA POWER STATION, UNIT NOS. 1 AND 2, REQUEST FOR ADDITIONAL INFORMATION (RAI) REGARDING PROPOSED LICENSE AMENDMENT REQUEST TO ADOPT TSTF-490, "DELETION OF E BAR DEFINITION AND REVISION TO RCS [REACTOR COOLANT SYSTEM]
SPECIFIC ACTIVITY" (TAC NOS. ME0264 AND ME0265)
Dear Mr. Christian:
By letter dated December 17, 2008, Virginia Electric and Power Company submitted a license amendment request to adopt TSTF-490, "Deletion of E Bar Definition and Revision to RCS Specific Activity," for North Anna Power Station, Unit Nos. 1 and 2. The proposed changes would replace the current Technical Specification 3.4.16 limit on RCS gross specific activity with a new limit on RCS noble gas specific activity. The noble gas specific activity limit would be based on a new dose equivalent XE-133 definition that would replace the current E Bar average disintegration energy definition.
The Nuclear Regulatory Commission staff discussed the draft RAI with your staff on April 30, 2009.
Enclosed is the final RAI. Please provide a response within 30 days of the date of this letter.
Please contact me at (301) 415-1864 if you have any questions.
Sincerely, IRA!
Donna N. Wright, Project Manager Plant Licensing Branch 11-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket Nos. 50-338 and 50-339
Enclosure:
RAI cc w/encl: Distribution via Listserv DISTRIBUTION:
PUBLIC RidsAcrsAcnw_MailCTR Resource JParillo, NRR LPL2-1 RlF RidsOgcRp Resource ABoatright, NRR RidsNrrDorlLpl2-1 Resource RidsRgn2MailCenter Resource LBenton, NRR RidsNrrLAMO'Brien Resource RidsNrrPMNorthAnna Resource RidsNrrDraAadb Resource RidsNrrDorlDpr Resource ADAMS Accesslon No. ML091270692
- transml'ttedb>v memo d t d a e OFFICE NRRlLPL2-1 NRRlLPL2-1/LA NRRlMDB/BC NRRlLPL2-1 /BC NAME DWright SRohrer RTaylor MWong (JThompson for)
DATE 5/12/09 5/12/09 4/30/09*
5/12/09 OFFICIAL RECORD COpy