ML062840713
| ML062840713 | |
| Person / Time | |
|---|---|
| Site: | Turkey Point  |
| Issue date: | 10/17/2006 |
| From: | Raghavan L NRC/NRR/ADRO/DORL/LPLII-2 |
| To: | Stall J Florida Power & Light Co |
| Moroney B, NRR/DORL, 415-3974 | |
| References | |
| TAC MD2927, TAC MD2928 | |
| Download: ML062840713 (6) | |
Text
October 17, 2006 Mr. J. A. Stall Senior Vice President, Nuclear and Chief Nuclear Officer Florida Power and Light Company P.O. Box 14000 Juno Beach, Florida 33408-0420
SUBJECT:
TURKEY POINT NUCLEAR PLANT, UNIT NOS. 3 AND 4 - APPROVAL OF PROPOSED REACTOR VESSEL MATERIAL SURVEILLANCE CAPSULE WITHDRAWAL SCHEDULE (TAC NOS. MD2927 AND MD2928)
Dear Mr. Stall:
By letter dated April 1, 2006, Florida Power and Light Company submitted a proposed change to the reactor pressure vessel material surveillance capsule withdrawal schedule for Turkey Point, Units 3 and 4, pursuant to Title 10 of the Code of Federal Regulations (10 CFR), Part 50, Appendix H, Reactor Vessel Material Surveillance Program Requirements. The proposed revision to the capsule withdrawal schedule was developed to accommodate the 60-year renewed operating licensing period, using the guidance of the American Society for Testing and Materials (ASTM), E-185-82, Standard Practice for Conducting Surveillance Tests for Light-Water Cooled Nuclear Power Reactor Vessels.
Our review is contained in the enclosed safety evaluation. The NRC staff found that the revised surveillance capsule withdrawal schedule for Turkey Point, Units 3 and 4, is acceptable for implementation and satisfies the requirements of Appendix H to 10 CFR Part 50 and the recommendations of ASTM E-185.
Sincerely,
/RA/
L. Raghavan, Chief Plant Licensing Branch II-2 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket Nos. 50-250 and 50-251
Enclosure:
Safety Evaluation cc w/encl: See next page
ML062840713 NRR-106 OFFICE NRR/LPL2-2/PM NRR/LPD2-2/LA NRR/CVIB/BC NRR/LPL2-2/BC NAME BMoroney BClayton MMitchell by memo dated LRaghavan DATE 10/17/06 10/17/06 10/03/06 10/17/06
Enclosure SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION SURVEILLANCE CAPSULE WITHDRAWAL SCHEDULE TURKEY POINT, UNITS 3 AND 4 FLORIDA POWER & LIGHT COMPANY DOCKET NOS. 50-250 AND 50-251
1.0 INTRODUCTION
By letter dated April 1, 2006, Florida Power and Light Company (FPL) submitted a proposed change to the reactor pressure vessel (RPV) material surveillance capsule withdrawal schedule for Turkey Point, Units 3 and 4. Pursuant to Title 10 of the Code of Federal Regulations (10 CFR), Part 50, Appendix H, Reactor Vessel Material Surveillance Program Requirements, such changes require Nuclear Regulatory Commission (NRC) staff review and approval. The NRC staff previously approved the withdrawal schedule in a letter dated April 22, 1985. At that time, Turkey Point, Units 3 and 4, were licensed to operate for 40 years. Subsequently, on June 6, 2002, the licenses were extended for an additional 20 years. The proposed revision to the capsule withdrawal schedule was developed to accommodate the 60-year licensing period.
2.0 REGULATORY EVALUATION
The surveillance program requirements in Appendix H to 10 CFR Part 50 were established to monitor the radiation-induced changes in the mechanical and impact properties of the RPV materials. Appendix H to 10 CFR Part 50 requires licensees to monitor changes in the fracture toughness properties of ferritic materials in the RPV beltline region of light-water nuclear power reactors. Appendix H to 10 CFR Part 50 states that the design of the surveillance program and the withdrawal schedule must meet the requirements of the edition of the American Society for Testing and Materials (ASTM) E-185, Standard Practice for Conducting Surveillance Tests for Light-Water Cooled Nuclear Power Reactor Vessels, that is current on the issue date of the American Society of Mechanical Engineers Boiler and Pressure Vessel Code (ASME Code) to which the RPV was purchased. Later editions of ASTM E-185 may be used, but including only those editions through 1982 (ASTM E-185-82). NUREG-1801, Generic Aging Lessons Learned (GALL) Report, provides additional guidance for the surveillance program for the 60-year extended period of operation.
3.0 TECHNICAL EVALUATION
3.1 Evaluation Criteria of ASTM E-185-82 For Turkey Point, Units 3 and 4, FPL is using the requirements of ASTM E-185-82 as its basis for meeting the RPV surveillance capsule withdrawal requirements of Appendix H to 10 CFR Part 50. Table 1 of ASTM E-185-82 requires that certain minimum numbers of surveillance capsules be removed from each of the vessels, based on the projected nilductility reference temperature shift (RTNDT) of the limiting material at the clad-vessel interface location of the RPV at the end-of-licensed plant life (EOL). ASTM E-185-82 establishes the following criteria for determining the minimum number of capsules that are to be removed in accordance with a withdrawal schedule and the number of capsules that are to be tested:
For plants with projected RTNDT less than 100 EF (56 EC), three capsules are required to be removed from the RPV and the first two capsules are required to be tested (for dosimetry, tensile-ductility, Charpy-V impact toughness, and alloying chemistry).
For plants with projected RTNDT between 100 EF (56 EC) and 200 EF (111 EC), four surveillance capsules are to be removed from the RPV and the first three capsules are required to be tested.
For plants with projected RTNDT above 200 EF (111 EC), five surveillance capsules are required to be removed from the RPV and the first four capsules are required to be tested.
For any of these withdrawal schedules, ASTM E-185-82 specifies that the final surveillance capsule should be withdrawn after accumulating a neutron fluence (E > 1.0 MeV) of between one and two times the peak EOL RPV fluence.
For Turkey Point, Units 3 and 4, a minimum of five capsules are required because the limiting weld material has a predicted RTNDT of greater than 200 EF. FPL has already withdrawn four of the five capsules and has proposed a change in a withdrawal schedule for the fifth capsule.
3.2 Changes Proposed to the Withdrawal Schedule for Turkey Point, Units 3 and 4 In accordance with ASTM E-185-82, Table 1, the recommended withdrawal schedule for the fifth capsule (capsule X from Turkey Point, Unit 4, hereafter referred to as capsule 4-X) is such that the surveillance capsule fluence will be between one and two times the peak EOL vessel fluence. EOL for Turkey Point, Units 3 and 4, is equivalent to 48 effective full-power years (EFPY) of operation, based on the renewed license expiration dates of 2032 and 2033, respectively. A change to the surveillance capsule withdrawal schedule is required to meet the EOL fluence requirements for the fifth capsule with the renewed license expiration dates.
The Turkey Point RPVs have experienced two major fuel management changes in their lifetime: the implementation of low-leakage cores and the insertion of part-length hafnium absorbers in peripheral assemblies. In addition, the V capsules in both units were moved to higher lead positions in 1990/1991. The licensees letter of April 1, 2006, provides the updated RPV surveillance capsule withdrawal schedule for Turkey Point, Units 3 and 4. The measured fluence for Turkey Point, Unit 3, capsule X (capsule 3-X) was used as an approximation of the capsule 4-X fluence, since they both had approximately the same EFPY at the time capsule 3-X was withdrawn on September 21, 2001. The revised EOL vessel fluence at the limiting weld is projected to be 3.93E19 neutrons per square centimeter (n/cm2). FPL proposed to revise the withdrawal schedule for the fifth capsule (capsule 4-X) from 24.0 EFPY to 33.2 EFPY (from 2006 to 2015). The revised schedule will change the surveillance capsule target fluence from 3.85E19 n/cm2 to 5.89E19 n/cm2. This revised target fluence is 1.5 times the projected EOL vessel fluence.
The following table summarizes the capsules that have already been removed from Turkey Point, Units 3 and 4, and the proposed withdrawal of the fifth capsule.
Capsule (Unit shown as subscript)
Removal Effective Full-Power Years (EFPY)
Capsule Fluence (n/cm2)
Notes T3 1.15 7.39 X1018 Capsule 1 T4 1.17 7.08 X 1018 S3 3.46 1.72 X 1019 Capsule 2 S4 3.41 1.43 X 1019 V3 8.06 1.53 X 1019 Capsule 3 X3 19.85 2.93 X 1019 Capsule 4 X4 33.2 5.89 X 1019 Proposed withdrawal of the fifth capsule Since capsule 4-X will have a fluence of about 1.5 times the peak vessel EOL fluence at the time of its removal, the staff has determined that the removal of this capsule is consistent with the criterion in ASTM E-185-82 and the recommendations of NUREG-1801 for the final required capsule to be withdrawn and tested.
4.0 CONCLUSION
Based on the NRCs staffs review of the FPL submittal, the NRC staff found that the revised surveillance capsule withdrawal schedule for Turkey Point, Units 3 and 4, RPVs satisfies the requirements of ASTM E-185-82 and the recommendations of NUREG-1801. Therefore, the NRC staff concludes that the licensees modified surveillance capsule withdrawal schedule for Turkey Point, Units 3 and 4, as provided in the April 1, 2006, letter is acceptable for implementation and satisfies the requirements of Appendix H to 10 CFR Part 50 for the 60-year extended license period.
Principal Contributor: Nihar Ray Date:
Mr. J. A. Stall TURKEY POINT PLANT Florida Power and Light Company cc:
Mr. William E. Webster Vice President, Nuclear Operations Florida Power & Light Company P.O. Box 14000 Juno Beach, FL 33408-0420 M. S. Ross, Managing Attorney Florida Power & Light Company P.O. Box 14000 Juno Beach, FL 33408-0420 Marjan Mashhadi, Senior Attorney Florida Power & Light Company 801 Pennsylvania Avenue, NW.
Suite 220 Washington, DC 20004 T. O. Jones, Site Vice President Turkey Point Nuclear Plant Florida Power and Light Company 9760 SW. 344th Street Florida City, FL 33035 County Manager Miami-Dade County 111 Northwest 1 Street, 29th Floor Miami, Florida 33128 Senior Resident Inspector Turkey Point Nuclear Plant U.S. Nuclear Regulatory Commission 9762 SW. 344th Street Florida City, Florida 33035 Mr. William A. Passetti, Chief Department of Health Bureau of Radiation Control 2020 Capital Circle, SE, Bin #C21 Tallahassee, Florida 32399-1741 Mr. Craig Fugate, Director Division of Emergency Preparedness Department of Community Affairs 2740 Centerview Drive Tallahassee, Florida 32399-2100 Attorney General Department of Legal Affairs The Capitol Tallahassee, Florida 32304 Michael O. Pearce Plant General Manager Turkey Point Nuclear Plant Florida Power and Light Company 9760 SW. 344th Street Florida City, FL 33035 James Connolly Licensing Manager Turkey Point Nuclear Plant 9760 SW 344th Street Florida City, FL 33035 Mark Warner, Vice President Nuclear Operations Support Florida Power and Light Company P.O. Box 14000 Juno Beach, FL 33408-0420 Mr. Rajiv S. Kundalkar Vice President - Nuclear Engineering Florida Power & Light Company P.O. Box 14000 Juno Beach, FL 33408-0420 Becky Ferrare Licensing Department Administrator Turkey Point Nuclear Plant 9760 SW 344th Street Florida City, FL 33035