ML13330B154
| ML13330B154 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 02/02/1987 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML13330B153 | List: |
| References | |
| TAC-59980, NUDOCS 8702130432 | |
| Download: ML13330B154 (6) | |
Text
- ,jtREG(,Z UNITED STATES 0
NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555 SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION REGARDING PROJECTED VALUES OF MATERIAL PROPERTIES FOR FRACTURE TOUGHNESS REQUIREMENTS FOR PROTECTION AGAINST PRESSURIZED THERMAL SHOCK EVENTS SOUTHERN CALIFORNIA EDISON COMPANY SAN ONOFRE NUCLEAR GENERATING STATION, UNIT 1 (SONGS-1)
DOCKET NO. 50-206
1.0 INTRODUCTION
As required by 10 CFR 50.61, "Fracture Toughness Requirements for Protection Against Pressurized Thermal Shock" (PTS Rule) which was published in the Federal Register July 23, 1985, the licensee for each operating pressurized water reactor "shall submit projected values of RTPTC (at the inner vessel surface) of reactor vessel beltline materials by gving values from the time of submittal to the expiration date of the operating license. The assessment must specify the bases for the projection including the assumptions regarding core loading patterns.
This assessment must be submitted by January 23, 1986, and must be updated whenever changes in core loadings, surveillance measurements or other information indicate a significant change in projected values."
By letter dated January 23, 1986, Southern California Edison Company (SCE, the licensee) submitted projected values of RT together with material properties and fast neutron fluence of reacM vessel beltline material for SONGS-1. The RTPTC and fluence values were projected to 24.05 effective full power year (EFPY) which is considered to be the end of life of the facility occurring on March 27, 2007.
2.0 EVALUATION 2.1 MATERIALS ASPECTS The controlling beltline material from the standpoint of PTS susceptibility was identified to be intermediate shell plate W7601-9.
The material properties of the controlling material and the associated margin and chemistry factor were reported to be:
8702130432 87o022 PDR ADOCK 05000206 PDR
h0
-2 Utility Submittal Staff Evaluation Cu (copper content, %)
=
0.18 0.18 Ni (nickel content, %)
0.20 0.20 I (Initial RTNDT' OF)
=
55 55 M (Margin, OF) 48 48 CF (Chemistry Factor, OF)=
87.2 The controlling material has been properly identified. The justification given for the copper and nickel contents and the initial RT - are acceptable. The margin has been derived from consideration Ng the bases for these values, following the PTS Rule, Section 50.61 of 10 CFR Part 50.
Assuming that the reported values of fluence are correct, Equation 1 of PTS rule governs, and the chemistry factor is as shown above.
2.2 FLUENCE ASPECTS The SONGS-1 Provisional Operating License (POL) was issued on March 27, 1967. Efforts are currently underway to convert the license to a Full-Term Operating License which would expire 40 years from the issuance date of the Construction Permit (March 2, 1964).
The licensee's submittal used March 27, 2007 (40 years from the issuance of the POL) as the end of life for the plant; a conservative assumption for the purposes of the PTS analyses. The licensee then calculated a fluence based upon a projection of 24.05 effective full-power years (EFPY) as of March 27, 2007. The 24.05 EFPY was calculated using the actual 10.12 EFPY as of the date of the January 23, 1986 submittal and projecting an additional 16.93 EFPY from January 23, 1986 until March 27, 2007 based upon an equilibrium cycle length of 484 effective full-power days and a production factor of 75% with an assumed 90 day refueling outage. However, for the purposes of this analysis, the staff has chosen to apply a more conservative capacity factor of 80% for projecting EFPY at the end of life resulting in an estimated 27.06 EFPY as of March 27, 2007.
-3 2.3 EVALUATION OF THE CALCULATED RT PTS The equation specified in 10 CFR 50.61 as applicable for the San Onofre Unit 1 plant is:
= I + M + (-10+470xCu+35OxCuxNi)xf 0.27 PTS where:
I = Initial RT OF
=
55 M = UncertaintNDargin IF
=
48 Cu= w/o of Copper in int. plate W-7601-9
=
.18 Ni-w/o of Nickel in int. plate W-7601-9
=
.20 F = peak pressure Y5ssel luence in units of 10 n/cm
=
9.98 0.27 then:
RTPTS = 55+48+(-10+470xO.18+350x0.18x0.20)x9.985 RTPTS = 103+87.2x1.86 = 103+162.3 = 265.3 0F 5 270 0 F The resulting estimated RTPTS value of 265.3 0F is acceptable since it is below the 270 0 F screening criterion for plate materials.
3.0 CONCLUSION
The licensee has calculated an RT oTS f 260 0F for the limiting plate material at the end of plant life ime based upon a projection of 24.05 EFPY as of March 27, 2007. The staff has calculated an RT of 265.3 0F based upon a more conservative estimate of 27.06 EFPTSat the end of plant lifetime. Since the results of both calculations are less than the 270oF screening criterion, the staff concludes that this issue is acceptably resolved for SONGS-1. In order to confirm the licensee's projected estimated RT PT throughout the duration of the license, the staff will request the licensee to submit a reevaluation of the RTPTS and comparison to the predicted value with future Pressure-Temperature submittals required by Appendix G to 10 CFR Part 50.
4.0 ACKNOWLEDGEMENT Principal Contributors: P. N. Randall, L. Lois, R. Dudley
FEB 0 2 1987 Distribution Copies:
Docket Files7?
NRC PDR Local PDR PAD#1 r/f PAD#1 p/f TNovak, Actg..DD NThompson, DHFT OGC-Bethesda EJordan BGrimes JPartlow GLear PShuttleworth RDudley CBerl inger ERossi GVissing, DPLB ACRS (10)
LFMB
DISTRIBUTION:
<' Docket File w/o Encl PAD#1 r/f w/o Encl.
PShuttleworth w/Encl.
February 4, 1987 Rudley w/Encl.
DOCKET NO(S). 50-206 Mr. Kenneth P. Baskin, Vice President Nuclear Engineering Safety and Licensing Department Southern California Edison Company 2244 Walnut Grove Avenue PO Box 800 SkERPd, CA 81770 SAN ONOFRE NUCLEAR GENERATING STATION, UNIT NO. 1 The following documents concerning our review of the subject facility are transmitted for your information.
O Notice of Receipt of Application, dated O Draft/Final Environmental Statment, dated__
O Notice of Availability of Draft/Final Environmental Statement, dated_.
O Safety Evaluation Report, or Supplement No.
, dated O Notice of Hearing on Application for Construction Permit, dated_.
O Notice of Consideration of Issuance of Facility Operating License, dated O Monthly Notice; Applications and Amendments to Operating Licenses Involving no Significant Hazards Considerations, dated O
Application and Safety Analysis Report, Volume O
Amendment No.
to Application/SAR dated O Construction Permit No. CPPR-
, Amendment No.
dated.
O Facility Operating License No. _,
Amendment No.
, dated O Order Extending Construction Completion Date, dated__
5 Other (Specify)Biweekly Notice covering period January 28, 1987.
Expiration date for hearing requests and comments February 27, 1987.
Division of PWR Licensing-A Office of Nuclear Reactor Regulation
Enclosures:
As stated cc:
See Next Page OFFICE>11 PAD#1 SURNAME>
PShuttleworth 2..............
DATEO3 NRC FORM 318 (1/84) NRCM 0240
Mr. Kenneth P. Baskin San Onofre Nuclear Generating Southern California Edison Company Station, Unit No. 1 cc Charles R. Kocher, Assistant Joseph 0. Ward, Chief General Counsel Radiological Health Branch James Beoletto, Esquire State Department of Health.
Southern California Edison Company Services Post Office Box 800 714 P Street, Office Bldg. 8 Rosemead, California 91770 Sacramento, California 95814 David R. Pigott Mr. Hans Kaspar, Executive Director Orrick, Herrington & Sutcliffe Marine Review Committee, Inc.
600 Montgomery Street 531 Encinitas Boulevard, Suite 105 San Francisco, California 94111 Encinitas, California 92024 Mr. Stephen B. Allman Ann C. Vasques, Chief San Diego Gas & Electric Company Radiological Programs Division P. 0. Box 1831 Governor's Office of Emergency Svcs.
San Diego, California 92112 State of California 2800 Meadowview Road Sacramento, CA 95832 Resident Inspector/San Onofre NPS d/o U.S. NRC P. 0. Box 4329 San Clemente, California 92672 Mayor City of San Clemente San Clemente, California 92672 Chai rman Board of Supervisors County of San Diego San Diego, California 92101 Director Energy Facilities Siting Division Energy Resources Conservation &
Development Commission 1516 -
9th Street Sacramento, California 95814 Regional Administrator, Region V U.S. Nuclear Regulatory Commission 1450 Maria Lane Walnut Creek, California 94596