ML111040272
| ML111040272 | |
| Person / Time | |
|---|---|
| Site: | Watts Bar  |
| Issue date: | 04/22/2011 |
| From: | John Lamb Watts Bar Special Projects Branch |
| To: | Krich R Tennessee Valley Authority |
| Lamb J, NRR/DORL, 415-1727 | |
| References | |
| TAC ME2532 | |
| Download: ML111040272 (3) | |
Text
UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555*0001 April 22, 2011 Mr. R. M. Krich Vice President, Nuclear licensing Tennessee Valley Authority 3R Lookout Place 1101 Market Street Chattanooga, TN 37402-2801
SUBJECT:
WATTS BAR NUCLEAR PLANT, UNIT 1 - REQUEST FOR ADDITIONAL INFORMATION REGARDING LICENSE AMENDMENT REQUEST FOR CARBON DIOXIDE FIRE SUPPRESSION SYSTEM INSTALLED IN AUXILIARY INSTRUMENT ROOM (TAC NO. ME2S32)
Dear Mr. Krich:
By letter dated October 30, 2009 (Agencywide Documents Access and Management System Accession No. ML093080377), Tennessee Valley Authority (TVA) requested a license amendment concerning a change to the Watts Bar Nuclear Plant, Unit 1 fire protection program requirements. Specifically, this involves changing the design basis of the total flooding automatic carbon dioxide (C02) fire suppression system in the Auxiliary Instrument Room from a SO-percent CO2 concentration to a 4S-percent concentration, retaining the currently required 1S-minute hold time to suppression a fire.
In order to complete its review, the U.S. Nuclear Regulatory Commission (NRC) requires additional information. Enclosed is the NRC staff's request for additional information (RAI).
Based on discussions with your staff on April 22, 2011, we understand that you plan to respond to the enclosed RAI by May 24, 2011.
If you have any questions regarding this issue, please feel free to contact me at (301) 41S-31 00.
Sincerely, John G. Lamb, Senior Project Manager Watts Bar Special Projects Branch Division of Operating Reactor licensing Office of Nuclear Reactor Regulation Docket No. SO-390
Enclosure:
RAI cc: Distribution via listserv
REQUEST FOR ADDITIONAL INFORMATION REGARDING THE LICENSE AMENDMENT REQUEST FOR THE CARBON DIOXIDE FIRE SUPPRESSION SYSTEM INSTALLED IN THE AUXILIARY INSTRUMENT ROOM WATTS BAR NUCLEAR PLANT. UNIT 1 TENNESSEE VALLEY AUTHORITY DOCKET NO. SO-390 By letter dated October 30, 2009 (Agencywide Documents Access and Management System Accession No. ML093080377), Tennessee Valley Authority requested a license amendment concerning a change to the Watts Bar Nuclear Plant (WBN), Unit 1 fire protection program requirements. Specifically, this involves changing the design basis of the total flooding automatic carbon dioxide (C02) fire suppression system in the Auxiliary Instrument Room from a SO-percent CO2concentration to a 4S-percent concentration, retaining the currently required 1S-minute hold time to suppression a fire.
In order to complete its review, the U.S. Nuclear Regulatory Commission (NRC) requires additional information. Below is the NRC staffs request for additional information (RAI).
The National Fire Protection Association 12, 1973 Edition, Section 2421 (Code of Record) for WBN Unit 1 installation, Table 6, "Flooding Factors for Specific Hazards," specifies flooding factors for specific hazards. Confirm the flooding factor (12 cubic feet per pound (ft3I1b) CO2or 0.0831b C02/fe) used to calculate the quantity of the C02to protect the Auxiliary Instrument Room. Provide the calculated quantity in pounds of CO2to be injected into WBN Unit 1 Auxiliary Instrument Room.
Enclosure
April 22, 2011 Mr. R. M. Krich Vice President, Nuclear Licensing Tennessee Valley Authority 3R Lookout Place 1101 Market Street Chattanooga, TN 37402-2801
SUBJECT:
WATTS BAR NUCLEAR PLANT, UNIT 1 - REQUEST FOR ADDITIONAL INFORMATION REGARDING LICENSE AMENDMENT REQUEST FOR CARBON DIOXIDE FIRE SUPPRESSION SYSTEM INSTALLED IN AUXILIARY INSTRUMENT ROOM (TAC NO. ME2532)
Dear Mr. Krich:
By letter dated October 30,2009 (Agencywide Documents Access and Management System Accession No. ML093080377), Tennessee Valley Authority (TVA) requested a license amendment concerning a change to the Watts Bar Nuclear Plant, Unit 1 fire protection program requirements. Specifically, this involves changing the design basis of the total flooding automatic carbon dioxide (C02) fire suppression system in the Auxiliary Instrument Room from a 50-percent CO2 concentration to a 45-percent concentration, retaining the currently required 15-minute hold time to suppression a fire.
In order to complete its review, the U.S. Nuclear Regulatory Commission (NRC) requires additional information. Enclosed is the NRC staff's request for additional information (RAI).
Based on discussions with your staff on April 22, 2011, we understand that you plan to respond to the enclosed RAI by May 24, 2011.
If you have any questions regarding this issue, please feel free to contact me at (301) 415-3100.
Sincerely, IRA by PMilano fori John G. Lamb. Senior Project Manager Watts Bar Special Projects Branch Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-390
Enclosure:
RAI cc: Distribution via Listserv DISTRIBUTION:
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04/22/11 04/12/11 OFFICIAL RECORD COPY