ML13317A276
| ML13317A276 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 08/11/1982 |
| From: | Harold Denton Office of Nuclear Reactor Regulation |
| To: | AFFILIATION NOT ASSIGNED |
| References | |
| TASK-03-06, TASK-3-6, TASK-RR LSO5-82-08-025, LSO5-82-8-25, NUDOCS 8208170167 | |
| Download: ML13317A276 (11) | |
Text
August 11, 1982 Docket No. 50-206 LS05-82-08-025 LETTER TO CALIFORNIA RESIDENTS RE: SOUTHERN CALIFORNIA EDISON COMPANY AND SAN DIEGO GAS AND ELECTRIC COMPANY (San Onofre Nuclear Generating Station, Unit No. 1)
Petitions received by the Nuclear Regulatory Commission between November 1979 and November 1981 from approximately 1560 residents of California requested that the NRC suspend or revoke the operating license for the San Onofre Nuclear Generating Station, Unit No. 1. These petitions, which were treated as petitions under 10 CFR 2.206, identified a number of issues related to safe operation of the plant, including its seismic design capability. By letter dated November 16, 1981, I informed you that this office had decided not to issue an order suspending or revoking License No. DPR-13, which authorizes operation of San Onofre Nuclear Generating Station, Unit No. 1. My letter enclosed "Director's Decision Under 10 CFR Section 2.206" prepared in response to the petitions filed by California residents. It also included an interim NRC staff report regarding the seismic capability of San Onofre Nuclear Generating Station, Unit 1. In the decision, I concluded that continued operation of the plant was acceptable until further seismic analyses were completed and submitted to the NRC and any necessary modifications resulting from such analyses were completed in a timely manner.
I also indicated that staff review of the seismic design issue was continuing.
Subsequent to the denial, the licensees continued to analyze the facility and submit the results to the NRC staff for review. At a meeting with the NRC staff on May 3, 1982, the licensees presented additional results of their seismic reevaluation of plant equipment and piping. These results showed unexpectedly high stress values for certain safety equipment, piping and their supports.
These high stress values caused the NRC staff to raise a concern as to whether the original licensing basis for San Onofre Unit 1 was satisfied. This concern oI was the subject of a meeting between the licensees and the NRC staff on May 20, 1982. Representatives of the petitioners were invited to attend this meeting and were present during the discussions. At the end of the meeting, the NRC
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staff concluded that the licensees needed to provide further information that demonstrated that the facility,met its licensed design basis before the plant would be permitted to restart from the current outage.
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California Residents August 11, 1982 By letter dated June 15, 1982, as supplemented by letter dated June 24, 1982, the licensees stated that they intended to complete the analyses and make modifications to the facility to meet a more conservative 0.67g Housner Spectra ground motion, rather than to demonstrate that the facility meets its original 0.5g Housner Spectra design basis. The licensees committed to extend the pre sent outage until the modifications are completed to upgrade San Onofre Unit No. 1 to the 0.67g Housner Spectra ground motion. Because of the importance of this commitment to public health and safety, the enclosed confirmatory order has been issued by the NRC, which requires that San Onofre Unit 1 be maintained in a shutdown condition until modifications described in the licensees submittals of June 15 and June 24, 1982 are completed.and NRC approval is obtained for restart.
Sincerely, Harold R. Denton, Director Office of Nuclear Reactor Regulation
Enclosure:
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DISTRIBUTION Docket OELD (Chandler/Burns)
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SOUTHERN CALIFORNIA EDISON COMPANY WPaulson TMurley (San Onofre Nuclear Generating Station, Unit No. 1)
RVollmer BSynder By.letter dated November 16, 1981, in response to petitions received by the Nuclear Regulatory Commission, I informed you that this office determined not to issue an order suspending or revoking License No. DPR-13, which authorizes Southern California Edison Company to operate San Onofre Nuclear Generating Station, Unit No. 1. My letter enclosed the "Director's Decision.
Under 10 CFR Section 2.206" that included an interim NRC staff report regard ing the seismic capability of San Onofre Nuclear Generating Station, Unit 1.
After additional evaluation by the NRC staff and the licensee, the licensee informed the staff by letter dated June 15, 1982, that the licensee would extend its current outage pending completion of necessary modifications to upgrade the seismic capability of the facility. Because of the importance of this commitment to public health and safety the enclosed confirmatory order has been issued, which requires that San Onofre Unit I be maintained in the shutdown condition until modificationsdecribed in Soutbern California Edison's submittal dated June 15, 1982 as.supplemented by letter dated June 24, 19820are completed an'dNRC approval is obtained for restart.
Sincerely, Harold R. Denton, Director Office of Nuclear Reactor Regulation
Enclosure:
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DISTRIBUTION Docket CMiles NRC PDR SCavanaugh Local PDR OI&E ORB Reading JMurray Docket No. 50-206 EDO Reading i
HDenton ACRS (10)
ECase NSIC DEisenhut SEPB TNovak LBickwit JHeltemes SChilk LETTER TO CALIFORNIA RESIDENTS DCrutchfield TRehm HSmith KCornell WPaulson SHanauer RE: SOUTHERN CALIFORNIA EDISON COMPANY 0ELD(Gonadl TMurley (San O'nofre Nuclear Generating Station, Unit No.
1 s'vs) RVollmer BSnyder By letter dated November 16, 1981, in response to petitions received by the Nuclear Regulatory Commission, I informed you that this office determined not to issue an order suspending or revoking License No. DPR-13, which authorizes Southern California Edison Company to operate San Onofre Nuclear Generating Station, Unit No. 1. My letter enclosed the "Director's Decision Under 10 CFR Section 2.206" that included an interim NRC staff report regard ing the seismic capability of Sari Onofre Nuclear Generating Station, Unit 1.
After additional evaluation by the NRC staff and the licensee, the licensee informed the staff by letter dated June 15, 1982, that the licensee would extendW its current outage pending completion of necessary modifications to.upgrade the seismic capability of the facility. Because of the importance of this commitment to public health and safety the enclosed confirmatory order has been issued, which requires that San Onofre Unit 1 be maintained in the shutdown condition until modifications are completed and approved by the NRC staff to upgrade the facility to 0.67g Housner Spectra ground motion as described in Southern California Edison's submittal dated June 15, 1982 as supplemented by letter dated June 24, 1982. At the completion of our review and prior to startup the NRC staff will issue a report on the seismic capability of San Onofre Unit 1. A copy of this report will be publicly avail able when it is completed.
Sincerely, Harold R. Denton, Director Office of Nuclear Reactor Regulation
Enclosure:
Order NRR: D/DIR NRR: DIR ECase HDenton
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California.Residents August 11, 1982 cc Charles R. Kocher, Assistant Mr. R. Dietch, Vice President General Counsel Nuclear Engineering and Operations James Beoletto, Esquire Southern California Edison Company Southern California Edison Company 2244 Walnut Grove Avenue Post Office Box 800 Post Offke Box 800 Rosemead, California 91770 Rosemead, California 91770 David-R. Pigott The Honorable Jerry Brown Orrick, Herrington & Sutcliffe Governor of the State of California 600 Montgomery Street State Capitol San Francisco, California 94111 Sacramento, California 95814 Harry B. Stoehr San Diego Gas & Electric Company P. 0. Box 1831 San Diego, California 92112 Resident Inspector/San Onofre NPS c/o U. S. NRC P. 0. Box 4329 San Clemente, California 92672 Mayor City of San Clemente San Clemente, California 92672 Chairman Board of Supervisors County of San Diego San Diego, California 92101 California Department of Health ATTN:
Chief, Environmental Radiation Control Unit Radiological Health Section 714 P Street, Room 498 Sacramento, California 95814 U. S. Environmental Protection Agency Region IX Office ATTN:
Regional Radiation Representative 215 Freemont Street San Francisco, California 94111 Robert H. Engelken, Regional Administrator Nuclear Regulatory Commission, Region V 1450 Maria Lane Walnut Creek, California 94596
7590-01 UNITED STATES OF AMERICA NUCLEAR.REGULATORY COMMISSION In the Matter of
)
SOUTHERN CALIFORNIA EDISON COMPANY
)
AND SAN DIEGO GAS AND ELECTRIC
)
Docket No. 50-206 COMPANY
)
(San Onofre Nuclear Generating Station, Unit No. 1)
ORDER CONFIRMING LICENSEE COMMITMENTS ON SEISMIC UPGRADING I.
The Southern California Edison Company (SCE) and the San Diego Gas and Electric Company (the licensees) hold Provisional Operating License No.
DPR-13, which authorizes Southern California Edison Company to operate the San Onofre Nuclear Generating Station, Unit No. 1 (the facility) at power levels not in excess of 1347 megawatts (thermal) rated power. The facility, which is located at the licensees' site in San Diego County, California, is a pressurized water reactor (PWR) used for the commercial generation of electri city.
II.
The San Onofre Nuclear Generating Station, Unit No.1, is one of eleven older operating plants that are part of the Systematic Evaluation Program (SEP).
The purpose of the SEP is to evaluate these plants against current licensing criteria to provide an integrated and balanced decision on backfitting. One of the SEP topics is the reevaluation of the capability of San Onofre Unit I to withstand seismic events.
7590-01 The San Onofre Unit 1 was licensed by the Atomic Energy Commission on March 27, 1967. In the original seismic design, components, systems and structures which were designated as important to the nuclear safety of the plant were designated Seismic Category A. Specifically, structures, systems and components associated with the reactor coolant system, boron injection, safety injection system, and residual heat removal were designed as Seismic Category A. The design basis used for Seismic Category A was what in today's terminology would be consistent with the 0.25g Housner Spectra Operating Basis Earthquake (OBE) and the 0.5g Housner Spectra Safe Shutdown Earthquake (SSE). The Turbine Building extensions, which contain Seismic Category A systems and components, were designated Seismic Category B and designed to a maximum ground acceleration of 0.2g (static force criteria). Seismic Category B is a classification specified by the licensees for components, systems, and structures that are important to the continuity of power generation or whose contained activity is such that release would not constitute a hazard.
Since the original plant was constructed, various structures and systems have been added to the plant. The licensees designed these new items to higher seismic levels to be consistent with the criteria being applied in the design of Units 2 and 3. Specifically, the sphere enclosure building and the diesel gener ator and its associated structures, system and components were designed to a 0.67g modified Newmark response spectra (more conservative than the Housner Spectra).
In 1973, the licensees initiated a program to reevaluate and modify as..
necessary the capability of San Onofre Unit 1 to withstand seismic events.
The criteria for this program were the 0.67g Housner Spectra. The first phase of this program consisted of reevaluating (1) systems and components to prevent
7590-01
-3 a design basis loss of coolant accident, including the main reactor coolant loop and Nuclear Steam Supply System (NSSS) components, and (2) the reactor building and the containment sphere. Based upon their reanalyses, the licensees concluded that the containment sphere, the reactor building and structural steel framing have resistance capacities in excess of those required to meet 0.67g Housner Spectra. As a result, the licensees concluded that modifications to these structures were not necessary. However, support modifications in the form of additional seismic restraints were required to meet allowable stresses for several of the larger NSSS components which were base supported. These modifications were implemented during an outage in 1976-1977.
Following initiation of the SEP in 1978, subsequent phases of the seismic reevaluation program were incorporated into the SEP. This program is proceeding in three phases: (1) reevaluation of balance-of-plant struc tures; (2) reevaluation of piping and mechanical equipment required to shut down the plant; and (3) reevaluation of piping and mechanical equipment required to mitigate the consequences of accidents. The earthquake input being used for this program is the 0.67g Housner response spectra.
The NRC staff issued letters dated August 4, 1980 and April 24, 1981 to the licensees requesting details of the seismic reevaluation program including the scope of review, the evaluation criteria, the schedule for completion and justification for continued operation in the interim until completion of the seismic reevaluation program. The licensees responded by letters dated September 24, 1980, February 23, April 24, July 7, August 11, September 28, October 5, 1981 and October 19, 1981.
The NRC
590-01
-4 Staff evaluated the licensee's responses and issued a Safety Evaluation Report of the Interim Seismic Adequacy for San Onofre Unit 1 dated November 16, 1981.
This report addressed the licensees' conclusion that continued operation is acceptable in the interim until the seismic reevaluation, and any necessary upgrading, is complete. The NRC staff agreed with the licensees' April 28, 1980 basis for continued operation for those systems, structures, and components which were originally designed to meet the 0.5g Housner Spectra as ground motion input; however, the staff concluded that certain modifications were necessary, in the near term, to upgrade the North Turbine Building Extension and the West Feedwater Heater Platform which were originally designed to 0.2g static. The licensees made modifications to upgrade these structures during the current outage which began on February 27, 1982.
At a meeting with the NRC staff on May 3, 1982, the licensees presented the results of their reevaluation, using the 0.67g Housner Spectra, of the balance of plant mechanical equipment and piping required to shutdown the plant. The results of the licensees' evaluation as documented in their April 30, 1982 sub mittal showed high stress values for certain equipment, piping and their supports.
These high stress values caused the NRC staff to raise a concern as to whether existing piping, pipe supports and mechanical equipment including its anchorage meet the original licensing basis for San Onofre Unit 1. This concern was the subject of a meeting between the licensees and the NRC staff on May 20, 1982.
At the end of this meeting, the NRC staff concluded that the licensees needed to provide information that demonstrates that the facility meets its licensed design basis before the plant would be permitted to restart from the current outage.
7590-01
-5 III.
By letter dated June 15, 1982 as supplemented by letter dated June 24, 1982, the licensees stated that they intend to complete the analyses and make modifica tions to the facility to meet the 0.67g Housner Spectra ground motion rather than to demonstrate that the facility meets its original 0.5g Housner Spectra design basis. The licensees committed to extend the present outage until the modifications are completed to upgrade San-Onofre Unit No. 1 to 0.67g Housner Spectra ground motion. In view of the foregoing information regarding the seismic capability of the facility, I have determined that the licensees' commitment is required in the interest of the public health and safety and should, therefore, be confirmed by an immediately effective Order.
IV.
Accordingly, pursuant to Sections 103 and 161i of the Atomic Energy Act of 1954, as amended, and the Commission's regulations.in 10 CFR Parts 2 and 50, IT IS HEREBY ORDERED, EFFECTIVE IMMEDIATELY, THAT the licensees shall:
Maintain San Onofre Unit 1 in the shutdown condition until modifications described in their submittal dated June 15, 1982 as supplemented by letter dated June 24, 1982 are com pleted and NRC approval is obtained for restart.
V.
The licensees may request a hearing on this Order within 20 days of the date of publication of this Order in the Federal Register. A request for a hearing shall be addressed to the Director, Division of Licensing, Office of Nuclear Reactor
@590-01
-6 Regulation, U. S. Nuclear Regulatory Commission, Washington, D. C. 20555. A copy shall also be sent to the Executive Legal Director at the same address.
A REQUEST FOR HEARING SHALL NOT STAY THE IMMEDIATE EFFECTIVENESS OF THIS ORDER.
If a hearing is requested by the licensees, the Commission will issue an Order designating the time and place of any such hearing. Resumption of oper ation on terms consistent with this Order need not be stayed by the pendency of any proceeding on this Order.
If a hearing is held concerning this Order, the issue to be considered at the hearing shall be whether, as set forth in Section IV of this Order, the licensees should maintain San Onofre Unit 1 in the shutdown condition until modifications described in their submittal dated June 15, 1982 as supplemented by letter dated June 24, 1982 are completed and NRC approval is obtained for restart.
This Order is effective upon issuance.
OR THE NUCLEAR REGULATORY COMMISSION Ei enhut, Director Division of Lqcensing Office of Nuclear Reactor Regulation Dated at Bethesda, Maryland this 11th day of August, 1982.