ML070590557
| ML070590557 | |
| Person / Time | |
|---|---|
| Site: | Palo Verde  |
| Issue date: | 03/06/2007 |
| From: | Fields B NRC/NRR/ADRO/DORL/LPLIV |
| To: | Edington R Arizona Public Service Co |
| Markley, M T, NRR/DORL/LP4, 301-415-5723 | |
| References | |
| TAC MD2650, TAC MD2651, TAC MD2652 | |
| Download: ML070590557 (3) | |
Text
March 6, 2007 Mr. Randall K. Edington Senior Vice President, Nuclear Mail Station 7602 Arizona Public Service Company P. O. Box 52034 Phoenix, AZ 85072-2034
SUBJECT:
PALO VERDE NUCLEAR GENERATING STATION, UNITS 1, 2, AND 3 -
REQUEST FOR ADDITIONAL INFORMATION REGARDING TECHNICAL SPECIFICATION 3.1.6, SHUTDOWN CONTROL ELEMENT ASSEMBLY (CEA)
INSERTION LIMITS, AMENDMENT SUBMITTAL (TAC NOS. MD2650, MD2651, AND MD2652)
Dear Mr. Edington:
By letter dated July 20, 2006, Arizona Public Service Company, submitted a license amendment request for the Palo Verde Nuclear Generating Station, Units 1, 2, and 3. The request is to revise Technical Specification 3.1.6, AShutdown Control Element Assembly (CEA) Insertion Limits,@ and associated Limiting Condition for Operation 3.6.1 and Surveillance Requirement 3.1.6.1. The proposed new limit would require CEAs to be withdrawn to
$147.75 inches, instead of the current limit of $144.75 inches.
The Nuclear Regulatory Commission (NRC) staff has reviewed the information provided and determined that additional information is required in order to complete the evaluation. The enclosed request for additional information was discussed with Glenn Michael of your staff on January 25, 2007. As agreed upon, the NRC staff is expecting a response within 60 days of the date of this letter.
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
Enclosure:
Request for Additional Information cc: See next page
ML070590557 NRR-088 OFFICE NRR/LPL4/PM NRR/LPL4/PM NRR/LPL4/LA NRR/LPL4/BC NAME MMarkley:sp MFields LFeizollahi DTerao DATE 3/5/07 3-5-07 3/5/07 3/6/07
REQUEST FOR ADDITIONAL INFORMATION PALO VERDE NUCLEAR GENERATING STATION, UNITS 1, 2, AND 3 DOCKET NOS. STN 50-528, STN 50-529, AND STN 50-530 By letter dated July 20, 2006, Arizona Public Service Company, submitted a license amendment request for the Palo Verde Nuclear Generating Station, Units 1, 2, and 3. The request is to revise Technical Specification (TS) 3.1.6, AShutdown Control Element Assembly (CEA) Insertion Limits,@ and associated Limiting Condition for Operation 3.6.1 and Surveillance Requirement 3.1.6.1. The proposed new limit would require CEAs to be withdrawn to $147.75 inches, instead of the current limit of $144.75 inches.
The staff has reviewed the information provided and determined that the following additional information is required in order to complete the evaluation.
- 1.
Section 4.0, TECHNICAL ANALYSIS, Safety Analysis: (Paragraph 1)
Please identify the ASpecific parameters@ that were analyzed to determine if, with the rods positioned at the new limit, the power distribution in the core was still within the assumptions made in the safety analyses. Paragraph 1 states that, A[t]o assess the effect control rod position would have on the parameters with the rods positioned at the new limit, several events and specific parameters were analyzed. The events were chosen because of their sensitivity to rod position.@ What transients/accidents, if any, other than steam line break and control rod ejection were analyzed? Identify the specific parameters, and the assumptions made in the safety analyses.
- 2.
Section 4.0, TECHNICAL ANALYSIS, Safety Analyses: (Paragraph 2)
Paragraph 2 states that, A[t]he checklist has three limiting parameters for rod worth. Each of the three parameters applies to a different power level and cycle length.@ Please explain these points and the subsequent statements that are made in Paragraph 2.
- 3.
Section 4.0, TECHNICAL ANALYSIS: (Paragraph 3)
The second sentence states that, A[t]he case having the smallest difference between the calculated value and the limiting value was selected.@ Also, the fourth sentence states that, A[t]he results of the simulation found a reduction in the margin to be less than one half of 1%.@
Please identify the parameters that are being referred to in each of these statements.
- 4.
TS Bases, Page B 3.1.6-4 Please provide clarifying information (e.g., title, etc.) for proposed Reference Number 4, Calculation 13-JC-SF-0202.
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. Scott Bauer, Acting 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