ML15244A221
| ML15244A221 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 03/27/1987 |
| From: | Stolz J Office of Nuclear Reactor Regulation |
| To: | Tucker H DUKE POWER CO. |
| Shared Package | |
| ML15244A223 | List: |
| References | |
| NUDOCS 8704090089 | |
| Download: ML15244A221 (2) | |
Text
Docket No. 50-269 March 27, 1987 Mr. Hal B. 'Tucker Vice President - Nuclear Production Duke Power Company P.O. Box 33189 Charlotte, North Carolina 28242
Dear Mr. Tucker:
Subject:
Projected Values of Material Properties for Fracture Toughness Requirements for Protection Against Pressurized Thermal Shock Events We have reviewed your letter dated January 23, 1986 which was submitted in response to the Pressurized Thermal Shock (PTS) Rule, 10 CFR 50.61, for the Oconee Nuclear Station, Unit 1. We have found the material properties of reactor vessel beltline materials, the projected fluence at the inner surface of the reactor vessel at the expiration date of the license and the calculated RT at the expiration date of the license, November 6, 2007, to be acP table. The calculated RT is below the screening criterion of 300 0 F for longitudinal weld material the expiration date of the license. This meets the requirements of the PTS Rule.
On January 14, 1986 with later supplements, you applied for an amendment to extend your license for Oconee Unit 1, and you have provided information to support operation of your plant to the proposed expiration date of the license without exceeding the PTS screening criteria. In our January 30, 1987 amend ment approving the extention, we addressed in the evaluation your request to extend the expiration date of your license. We found that for Oconee Unit 1 the staff estimated that for 40 calendar years of operation, the RTPTS will not exceed the PTS screening criterion.
The PTS Rule requires that the projected assessment of the RT must be updated whenever changes in core loadings, surveillance measue ents or other information (including changes in capacity factor) indicate a significant change in the projected values. This ensures that the licensees will track the fluence at the limiting beltline materials throughout the life of the plant to verify their assumptions. In this regard, we request you to submit a reevaluation of the RT and comparison of the predicted value with future Pressure-Temperature s. ittals which are required by 10 CFR 50, Appendix G.
This request is covered under OMB clearance No. 3150-0011.
Our associated Safety Evaluation is enclosed.
Sincerely, 8704090089 870327
/S/
PR'ADOCK 05000269/
PDR0 John F. Stolz, Director PWR Project Directorate #6 Division of PWR Licensing-B Enclosure Office:
PM 06 M/PBD6 PBD6 BC/PBEB PD 6
Concurrees:
's/jm GVissing GEdi n
TMarsh isol Date:
2/ /87
/p / 87 3/2-)/87 3/}i/87 3/27/87
Mr. H. B. Tucker Oconee Nuclear Station Duke Power Company Units Nos. 1, 2 and 3 cc:
Mr. A. V. Carr, Esq.
Duke Power Company Duke Power Company P. 0. Box 33189 Post Office Rox 33189 422 South Church Street 422 South Church Street Charlotte, North Carolina 28242 Charlotte, North Carolina 28242 J. Michael McGarry, III, Esq.
Bishop, Liberman, Cook, Purcell & Reynolds 1200 Seventeenth Street, N.W.
Washington, D.C. 20036 Mr. Robert B. Borsum Babcock & Wilcox Nuclear Power Generation Division Suite 220, 7910 Woodmont Avenue Bethesda, Maryland 20814 Manager, LIS NUS Corporation 2536 Countryside Boulevard Clearwater, Florida 33515 Senior Resident Inspector U.S. Nuclear Regulatory Commission Route 2, Box 610 Seneca, South Carolina 29678 Reaional Administrator U.S. Nuclear Requlatory Commission 101 Marietta Street, N.W.
Suite 3100 Atlanta, Georgia 30303 Mr. Heyward G. Shealy, Chief Bureau of Radiological Health South Carolina Department of Health and Environmental Control 2600 Bull Street Columbia, South Carolina 29201 Office of Intergovernmental Relations 116 West Jones Street Raleigh, North Carolina 27603 Honorable James M. Phinney County Supervisor of Oconee County Walhalla, South Carolina 29621