ML13330B496

Forwards Safety Evaluation Supporting Structures Ability to Meet Safety Function Under Postulated Loadings.Submittal of Surveillance Repts Requested

ML13330B496
Person / Time
Site:	San Onofre
Issue date:	11/24/1991
From:	Kalman G Office of Nuclear Reactor Regulation
To:	Ray H SOUTHERN CALIFORNIA EDISON CO.
Shared Package
ML13330B497	List: ML13330B496 ML13330B498
References
TAC-M74168, NUDOCS 9112110195
Download: ML13330B496 (4)

Text

November 24, 1991 Docket No. 50-206 DISTRIBUTION:

Docket File-PDV r/f PDV p/f Mr. Harold B. Ray NRC/Locals PDRs BBoger MVirgilio Senior Vice President RCesaro GKalman OGC(15B18)

Southern California Edison Company Edordan(MNBB37O1)

ACRS(1O)(P315)

Irvine Operations Center RZimmermanRV 23 Parker Street Irvine, California 92718

SUBJECT:

SAN ONOFRE UNIT 1 INTAKE STRUCTURE DEGRADATION (TAC NO. M74168) (items (1) through (11)) documents the identification, evaluation, and resolution of concerns related to the San Onofre Nuclear Generating Station, Unit 1 intake structure degradation.

Based on a document review, an examination of accessible portions of the structure, an evaluation of corrective actions taken by Southern California Edison and a review of pertinent design calcula tions; the NRC staff concludes that the structure is able to meet its safety function under postulated loadings.

The adequacy of the structure will be reevaluated during each refueling outage.

Staff review of related surveillance procedures concluded that there is adequate assurance that conditions adverse to safety will be identified before the safety function of the intake structure is compromised. Corrective actions for safety significant defects will be completed before start-up following a surveillance.

The staff safety evaluation related to this issue is provided in Enclosure 2.

Note that sections 2.5 and 2.6 of the evaluation list surveillance requirements that were previously agreed upon. Please submit completed surveillance reports for our information. This letter documents completion of the NRC staff review of the intake structure degradation and the associated TAC No. M74168 is now complete.

Sincerely, Original signed by George Kalman, Sr. Project Manager Project Directorate V Division of Reactor Projects III/IV/V Office of Nuclear Reactor Regulation

Enclosures:

1. List of References

2. Safety Evaluation cc w/enclosures:

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UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555 November 24, 1991 Docket No. 50-206 Mr. Harold B. Ray Senior Vice President Southern California Edison Company Irvine Operations Center 23 Parker Street Irvine, California 92718

SUBJECT:

SAN ONOFRE UNIT 1 INTAKE STRUCTURE DEGRADATION (TAC NO. M74168) (items (1) through (11)) documents the identification, evaluation, and resolution of concerns related to the San Onofre Nuclear Generating Station, Unit 1 intake structure degradation. Based on a document review, an examination of accessible portions of the structure, an evaluation of corrective actions taken by Southern California Edison and a review of pertinent design calcula tions; the NRC staff concludes that the structure is able to meet its safety function under postulated loadings.

The adequacy of the structure will be reevaluated during each refueling outage.

Staff review of related surveillance procedures concluded that there is adequate assurance that conditions adverse to safety will be identified before the safety function of the intake structure is compromised. Corrective actions for safety significant defects will be completed before start-up following a surveillance.

The staff safety evaluation related to this issue is provided in Enclosure 2.

Note that sections 2.5 and 2.6 of the evaluation list surveillance requirements that were previously agreed upon. Please submit completed surveillance reports for our information. This letter documents completion of the NRC staff review of the intake structure degradation and the associated TAC No. M74168 is now complete.

Sincerely, George Kalman, Sr. Project Manager Project Directorate V Division of Reactor Projects III/IV/V Office of Nuclear Reactor Regulation

Enclosures:

1. List of References

2. Safety Evaluation cc w/enclosures:

See next page

Mr. Harold B. Ray San Onofre Nuclear Generating Southern California Edison Company Station, Unit No. 1 cc:

Mr. Phil Johnson Mr. Richard J. Kosiba, Project Manager U.S. Nuclear Regulatory Commission Bechtel Power Corporation Region V 12440 E. Imperial Highway 1450 Maria Lane, Suite 210 Norwalk, California 90650 Walnut Creek, California 94596 Mr. Robert G. Lacy Manager, Nuclear Department San Diego Gas & Electric Company P. 0. Box 1831 San Diego, California 92112 Resident Inspector/San Onofre NPS c/o U.S. Nuclear Regulatory Commission P. 0. Box 4329 San Clemente, California 92674 Mayor City of San Clemente 100 Avenida Presidio San Clemente, California 92672 Chairman, Board of Supervisors County of San Diego 1600 Pacific Highway, Room 335 San Diego, California 92101 Regional Administrator, Region V U.S. Nuclear Regulatory Commission 1450 Maria Lane, Suite 210 Walnut Creek, California 94596 Mr. John Hickman Senior Health Physicist Environmental Radioactive Mgmt. Unit Environmental Management Branch State bepartment of Health Services 714 P Street, Room 616 Sacramento, California 95814 Mr. Don J. Womeldorf Chief, Environmental Management Branch California Department of Health Services 714 P Street, Room 616 Sacramento, California 95814

(.9)

REFERENCES (1) LER No.84-009 dated September 5, 1984 (2) SCE Letter dated October 4, 1985,

Subject:

Intake Structure Surveillance Guidelines San Onofre (3) SCE Letter dated October 18, 1984,

Subject:

Intake Structure Degradation and Repair (4) NRC Letter dated April 24, 195,

Subject:

Intake Structure Corrosion and Repair (5) NRC Letter dated July 11, 1986,

Subject:

Long-Term Service Seismic Reevaluation Program (6) Second Surveillance Report for SONGS Unit 1 Intake Structure (Cycle X Refueling Outage) dated March 1989 (7) NRC Letter dated November 6, 1989,

Subject:

Intake Structure Repair, San Onofre Nuclear Generating Station, Unit No. 1 (TAC No. 74168)

(8) SCE Letter dated February 12, 1990,

Subject:

Intake Structure Repair (TAC No. 74168) San Onofre Nuclear Generating Station Unit 1 (9) NRC Letter dated August 13, 1990,

Subject:

Intake Structure Degradation San Onofre Nuclear Generating Station, Unit No. 1 (TAC No. 74168)

(10) SCE Letter dated December 10, 1990,

Subject:

Intake Structure Degradation - NRC Request for Information San Onofre Nuclear Generating Station, Unit 1 (TAC No. 74168)

(11) SCE Letter dated January 15, 1991,

Subject:

Responses to NRC Questions on Intake Structure Degradation San Onofre Nuclear Generating Station, Unit 1 (TAC No. 74168)