ML063070139
| ML063070139 | |
| Person / Time | |
|---|---|
| Site: | Watts Bar  |
| Issue date: | 12/04/2006 |
| From: | Pickett D NRC/NRR/ADRO/DORL/LPLII-2 |
| To: | Singer K Tennessee Valley Authority |
| J. Paige, JCP4, 415-5888 | |
| References | |
| GL-03-001, TAC MB9872 | |
| Download: ML063070139 (4) | |
Text
December 4, 2006 Mr. Karl Singer Chief Nuclear Officer and Executive Vice President Tennessee Valley Authority 6A Lookout Place 1101 Market Street Chattanooga, TN 37402-2801
SUBJECT:
WATTS BAR NUCLEAR PLANT, UNIT 1 - NRC RECEIPT OF RESPONSE TO GENERIC LETTER 2003-01, CONTROL ROOM HABITABILITY (TAC NO. MB9872)
Dear Mr. Singer:
The Nuclear Regulatory Commission (NRC) acknowledges the receipt of your responses to Generic Letter (GL) 2003-01, Control Room Habitability, dated August 8, 2003 (ML032230507
[Agencywide Documents Access and Management System Accession Number]) and August 4, 2004 (ML042230173). This letter provides the status of your response and describes any additional information that may be necessary to consider your response to GL 2003-01 complete.
GL 2003-01 requested that you confirm that your control rooms meet their design bases (e.g. General Design Criterion (GDC) 1, 3, 4, 5, &19, draft GDC, or principal design criteria),
with special attention to: (1) Determination of the most limiting unfiltered and/or filtered inleakage into the control room and comparison to values used in your design bases for meeting control room operator dose limits from accidents (Item 1(a)); (2) Determination that the most limiting unfiltered inleakage is incorporated into your hazardous chemical assessments (Item 1(b)); and, (3) Determination that reactor control capability is maintained in the control room or at the alternate shutdown location in the event of smoke (Item 1(b)). The GL further requested information on any compensatory measures in use to demonstrate control room habitability (CRH), and plans to retire them (Item 2).
You reported the results of ASTM E741 [American Society for Testing and Materials, Standard Test Method for Determining Air Change in a Single Zone by Means of a Tracer Gas Dilution]
tracer gas tests for the Watts Barr Nuclear Plant, Unit 1 control room:
You determined that the maximum tested value for inleakage into the Control Room Envelope (CRE) was 6 cubic feet per minute (cfm), which is less than the value of 51 cfm assumed in the design basis radiological dose analyses for CRH.
You indicated that your evaluation, in accordance with Regulatory Guide 1.78, supported a conclusion that unfiltered inleakage into the CRE is not specifically incorporated into the hazardous chemical assessment because toxic gases are not considered to be a threat based on hazard screening performed on chemicals stored onsite or transported nearby. You also indicated that reactor control capability is maintained from either the control room or the alternate shutdown locations in the event of smoke.
K. Singer The GL further requested that you assess your Technical Specifications (TS) to determine if they verify the integrity of the CRE, including ongoing verification of the inleakage assumed in the design basis analysis for CRH, and in light of concerns regarding the use of a delta () P measurement to alone provide such verification (Item 1(c)). As permitted by the GL, you provided a schedule for revising the surveillance requirement in the TS to reference an acceptable surveillance methodology. In your August 4, 2004 response, you committed to submit a license amendment request (LAR) to adopt TS Surveillance Requirements (SRs) that verify CRH per Technical Specification Task Force (TSTF)-448, within 9 months following NRC approval of TSTF-448.
The information you provided also supported the fact that there are no compensatory measures needed to be in place to demonstrate CRH.
The information you provided also supported the conclusion that you are committed to meet the GDC regarding CRH.
Your commitment to submit an LAR based on TSTF-448, following our formal review and approval, is acceptable for purposes of closing out your response to GL 2003-01. The staff will monitor submission of the LAR and interact with you as necessary during the amendment process.
If you have any questions regarding this correspondence, please contact me at 301-415-1364.
Sincerely,
/RA/
Douglas V. Pickett, Senior Project Manager Plant Licensing Branch II-2 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-390 cc: See next page
K. Singer December 4, 2006 The GL further requested that you assess your Technical Specifications (TS) to determine if they verify the integrity of the CRE, including ongoing verification of the inleakage assumed in the design basis analysis for CRH, and in light of concerns regarding the use of a delta () P measurement to alone provide such verification (Item 1(c)). As permitted by the GL, you provided a schedule for revising the surveillance requirement in the TS to reference an acceptable surveillance methodology. In your August 4, 2004 response, you committed to submit a license amendment request (LAR) to adopt TS Surveillance Requirements (SRs) that verify CRH per Technical Specification Task Force (TSTF)-448, within 9 months following NRC approval of TSTF-448.
The information you provided also supported the fact that there are no compensatory measures needed to be in place to demonstrate CRH.
The information you provided also supported the conclusion that you are committed to meet the GDC regarding CRH.
Your commitment to submit an LAR based on TSTF-448, following our formal review and approval, is acceptable for purposes of closing out your response to GL 2003-01. The staff will monitor submission of the LAR and interact with you as necessary during the amendment process.
If you have any questions regarding this correspondence, please contact me at 301-415-1364.
Sincerely,
/RA/
Douglas V. Pickett, Senior Project Manager Plant Licensing Branch II-2 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-390 cc: See next page DISTRIBUTION:
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NAME JPaige DPickett RSola CJackson RDennig DPickett DATE 11/20/06 11/28/06 11/20/06 12 /1/06 12/4/06 12 /4/06 OFFICIAL RECORD COPY
Mr. Karl W. Singer Tennessee Valley Authority WATTS BAR NUCLEAR PLANT cc:
Mr. Ashok S. Bhatnagar, Senior Vice President Nuclear Operations Tennessee Valley Authority 6A Lookout Place 1101 Market Street Chattanooga, TN 37402-2801 Mr. Preston D. Swafford, Senior Vice President Nuclear Support Tennessee Valley Authority 6A Lookout Place 1101 Market Street Chattanooga, TN 37402-2801 Mr. Larry S. Bryant, Vice President Nuclear Engineering & Technical Services Tennessee Valley Authority 6A Lookout Place 1101 Market Street Chattanooga, TN 37402-2801 Mr. Michael D. Skaggs, Site Vice President Watts Bar Nuclear Plant Tennessee Valley Authority P.O. Box 2000 Spring City, TN 37381 General Counsel Tennessee Valley Authority 6A West Tower 400 West Summit Hill Drive Knoxville, TN 37902 Mr. John C. Fornicola, Manager Nuclear Assurance Tennessee Valley Authority 6A Lookout Place 1101 Market Street Chattanooga, TN 37402-2801 Mr. Robert H. Bryan, Jr., General Manager Licensing and Industry Affairs Tennessee Valley Authority 4X Blue Ridge 1101 Market Street Chattanooga, TN 37402-2801 Ms. Beth A. Wetzel, Manager Corporate Nuclear Licensing and Industry Affairs Tennessee Valley Authority 4X Blue Ridge 1101 Market Street Chattanooga, TN 37402-2801 Mr. James D. Smith, Acting Manager Licensing and Industry Affairs Watts Bar Nuclear Plant Tennessee Valley Authority P.O. Box 2000 Spring City, TN 37381 Mr. Jay Laughlin, Plant Manager Watts Bar Nuclear Plant Tennessee Valley Authority P.O. Box 2000 Spring City, TN 37381 Senior Resident Inspector Watts Bar Nuclear Plant U.S. Nuclear Regulatory Commission 1260 Nuclear Plant Road Spring City, TN 37381 County Executive 375 Church Street Suite 215 Dayton, TN 37321 County Mayor P. O. Box 156 Decatur, TN 37322 Mr. Lawrence E. Nanney, Director Division of Radiological Health Dept. of Environment & Conservation Third Floor, L and C Annex 401 Church Street Nashville, TN 37243-1532 Ms. Ann P. Harris 341 Swing Loop Road Rockwood, TN 37854