ML062790336
| ML062790336 | |
| Person / Time | |
|---|---|
| Site: | Palo Verde  |
| Issue date: | 01/09/2007 |
| From: | Fields M NRC/NRR/ADRO/DORL/LPLIV |
| To: | James M. Levine Arizona Public Service Co |
| Fields M, NRR/DORL/LP4, 415-3062 | |
| References | |
| GL-03-001, TAC MB9834, TAC MB9835, TAC MB9836 | |
| Download: ML062790336 (4) | |
Text
January 9, 2007 Mr. James M. Levine Executive Vice President, Generation Arizona Public Service Company P.O. Box 52034 Phoenix, AZ 85072-2034
SUBJECT:
PALO VERDE NUCLEAR GENERATING STATION, UNITS 1, 2, AND 3 -
CLOSEOUT OF GENERIC LETTER 2003-01 CONTROL ROOM HABITABILITY (TAC NOS. MB9834, MB9835, MB9836)
Dear Mr. Levine:
By letters dated December 5, 2003, July 19, 2005, August 28, 2006, and December 8, 2006 (Agencywide Documents Access and Management System (ADAMS) Accession Nos. ML033500344, ML052070713, ML062490502 and ML063530482 respectively), Arizona Public Service Company (the licensee), responded to Generic Letter (GL) 2003-01, Control Room Habitability, for the Palo Verde Nuclear Generating Station (Palo Verde), Units 1, 2, and 3.
The GL 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 (GL 2003-01, Item 1a); (2) Determination that the most limiting unfiltered inleakage is incorporated into your hazardous chemical assessments (GL 2003-01, Item 1b); and, (3) Determination that reactor control capability is maintained in the control room or at the alternate shutdown location in the event of smoke (GL 2003-01, Item 1b).
The GL further requested information on any compensatory measures in use to demonstrate control room habitability, and plans to retire them (GL 2003-01, Item 2).
The Palo Verde control rooms are all separate control rooms pressurized for accident mitigation and are designed in accordance with the design criteria contained in GDCs regarding control room habitability, as documented in your Updated Final Safety Analysis Report.
You reported the results of tracer gas tests for the control rooms conducted using the guidance of American Society for Testing Materials E741, Standard Test Method for Determining Air Change in a Single Zone by Means of a Tracer Gas Dilution.
For the Unit 1 control room, you determined that the maximum tested value for unfiltered inleakage into the control room envelope (CRE) was 14 standard cubic feet per minute (scfm), which included 10 scfm for ingress and egress. This test result is less than the value of 61 scfm assumed in the design basis radiological analyses for control room habitability (CRH).
For the Unit 2 control room, you determined that the maximum tested value for unfiltered inleakage into the CRE was 10 scfm, which included 10 scfm for ingress and egress.
J. M. Levine This test result is less than the value of 61 scfm assumed in the design basis radiological analyses for CRH.
For the Unit 3 control room, you determined that the maximum tested value for unfiltered inleakage into the CRE was 10 scfm, which included 10 scfm for ingress and egress.
This test result is less than the value of 61 scfm assumed in the design basis radiological analyses for CRH.
You indicated that the most limiting unfiltered airflow is the normal control room ventilation system flow of 1,200 scfm, and this normal airflow is used for the evaluation of hazardous chemicals to the control room staff. You also indicated that reactor control capability is maintained from either the control room or the remote shutdown room in the event of smoke.
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 control room habitability in light of the demonstrated inadequacy of a delta pressure measurement to alone provide such verification (GL 2003-01, Item 1c). In your December 8, 2006, response you committed to submit a TS amendment request to modify the requirements related to control room envelope habitability in accordance with Technical Specification Task Force Traveler 448 (TSTF-448) within 1 year after the final approved Consolidated Line Item Improvement Process for TSTF-448 is published in the Federal Register.
Based on the licensees letters responding to the GL and its commitment to submit a TS amendment request adopting TSTF-448, the Nuclear Regulatory Commission staff concludes that GL 2003-01 is considered closed for the Palo Verde units. If you have any questions, please contact me at (301) 415-3062.
Sincerely,
/RA/
Mel B. Fields, Senior Project Manager Plant Licensing Branch IV Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket Nos. STN 50-528, STN 50-529, and STN 50-530 cc: See next page
J. M. Levine This test result is less than the value of 61 scfm assumed in the design basis radiological analyses for CRH.
For the Unit 3 control room, you determined that the maximum tested value for unfiltered inleakage into the CRE was 10 scfm, which included 10 scfm for ingress and egress.
This test result is less than the value of 61 scfm assumed in the design basis radiological analyses for CRH.
You indicated that the most limiting unfiltered airflow is the normal control room ventilation system flow of 1,200 scfm, and this normal airflow is used for the evaluation of hazardous chemicals to the control room staff. You also indicated that reactor control capability is maintained from either the control room or the remote shutdown room in the event of smoke.
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 control room habitability in light of the demonstrated inadequacy of a delta pressure measurement to alone provide such verification (GL 2003-01, Item 1c). In your December 8, 2006, response you committed to submit a TS amendment request to modify the requirements related to control room envelope habitability in accordance with Technical Specification Task Force Traveler 448 (TSTF-448) within 1 year after the final approved Consolidated Line Item Improvement Process for TSTF-448 is published in the Federal Register.
Based on the licensees letters responding to the GL and its commitment to submit a TS amendment request adopting TSTF-448, the Nuclear Regulatory Commission staff concludes that GL 2003-01 is considered closed for the Palo Verde units. If you have any questions, please contact me at (301) 415-3062.
Sincerely,
/RA/
Mel B. Fields, Senior Project Manager Plant Licensing Branch IV Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket Nos. STN 50-528, STN 50-529, and STN 50-530 cc: See next page DISTRIBUTION:
PUBLIC LPLIV r/f RidsAcrsAcnwMailCenter RidsNrrDprPgcb RidsNrrDorlLpl4 RidsNrrLAJBurkhardt RidsNrrPMMFields RidsNrrDorl (CHaney/JLubinski)
RidsRgn4MailCenter RidsOgcRp JRobinson, NRR ADAMS Accession No.: ML062790336 OFFICE NRR/LPL4/PM NRR/LPL4/LA NRR/SCVB/BC NRR/PGCB/BC NRR/LPL4/BC NAME MFields LFeizollahi RDennig CJackson DTerao DATE 1/9/07 1/9/07 1/9/07 1/9/07 1/9/07 OFFICIAL AGENCY RECORD
May 2006 Palo Verde Nuclear Generating Station cc:
Mr. Steve Olea Arizona Corporation Commission 1200 W. Washington Street Phoenix, AZ 85007 Mr. Douglas Kent Porter Senior Counsel Southern California Edison Company Law Department, Generation Resources P.O. Box 800 Rosemead, CA 91770 Senior Resident Inspector U.S. Nuclear Regulatory Commission P.O. Box 40 Buckeye, AZ 85326 Regional Administrator, Region IV U.S. Nuclear Regulatory Commission Harris Tower & Pavillion 611 Ryan Plaza Drive, Suite 400 Arlington, TX 76011-8064 Chairman Maricopa County Board of Supervisors 301 W. Jefferson, 10th Floor Phoenix, AZ 85003 Mr. Aubrey V. Godwin, Director Arizona Radiation Regulatory Agency 4814 South 40 Street Phoenix, AZ 85040 Mr. Craig K. Seaman, General Manager Regulatory Affairs and Performance Improvement Palo Verde Nuclear Generating Station Mail Station 7636 P.O. Box 52034 Phoenix, AZ 85072-2034 Mr. Matthew Benac Assistant Vice President Nuclear & Generation Services El Paso Electric Company 340 East Palm Lane, Suite 310 Phoenix, AZ 85004 Mr. John Taylor Public Service Company of New Mexico 2401 Aztec NE, MS Z110 Albuquerque, NM 87107-4224 Mr. Geoffrey M. Cook Southern California Edison Company 5000 Pacific Coast Hwy Bldg N50 San Clemente, CA 92672 Mr. Robert Henry Salt River Project 6504 East Thomas Road Scottsdale, AZ 85251 Mr. Jeffrey T. Weikert Assistant General Counsel El Paso Electric Company Mail Location 167 123 W. Mills El Paso, TX 79901 Mr. John Schumann Los Angeles Department of Water & Power Southern California Public Power Authority P.O. Box 51111, Room 1255-C Los Angeles, CA 90051-0100 Mr. Brian Almon Public Utility Commission William B. Travis Building P.O. Box 13326 1701 North Congress Avenue Austin, TX 78701-3326 Ms. Karen O'Regan Environmental Program Manager City of Phoenix Office of Environmental Programs 200 West Washington Street Phoenix AZ 85003