ML13324A784

Forwards List of Open Items Resulting from NRC 851210-13 Audit of Seismic Reevaluation Program.Audit Review Will Be Conducted During Wk of 860106

ML13324A784
Person / Time
Site:	San Onofre
Issue date:	01/02/1986
From:	Lear G Office of Nuclear Reactor Regulation
To:	Baskin K SOUTHERN CALIFORNIA EDISON CO.
References
NUDOCS 8601080199
Download: ML13324A784 (4)

Text

January 2, 1986 Docket No.:

50-206 Mr. Kenneth P. Baskin, Vice President Nuclear Engineering Safety and Licensing Department Southern California Edison Company 2244 Walnut Grove Avenue Post Office Box 800 Rosemead, California 91770

SUBJECT:

SAN ONOFRE NUCLEAR GENERATING STATION UNIT 1 - OPEN ITEMS FROM DECEMBER 1985 AUDIT REVIEW OF SEISMIC REEVALUATION PROGRAM On December 10 through 13, 1985, the NRC conducted an audit of seismic analyses performed for Southern California Edison Company (SCE), for San Onofre Unit 1, by SCE consultants. As a result of this review, the enclosed list of open items was developed. You should be prepared to respond to these questions during the audit review to be conducted during the week of January 6, 1986.

Original signed by:

George Lear George Lear, Director PWR Project Directorate #1 Division of PWR Licensing - A

Enclosure:

DISTRIBUTION As Stated Docket File ACRS (10)

ISAP Reading JPartlow cc w/enclosure:

NRC PDR EJordan See Next Page Local PDR BGrimes NSIC GLear OELD RDudley PD#1 Reading CGrimes FMiraglia TCheng HThompson EMcKenna PAnderson ISA '~'1~W-B ISA ISAP:PWR PD

-A PD#1:PWA EMcKenna:lt TChen CGrimes RDudley GLe r

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8601060199 860102 /

PDR ADOCK 05000201 P

PDR

Mr. Kenneth P. Baskin San Onofre Nuclear Generating Station Southern California Edison Company 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 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 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

OPEN ITEMS RESULTING FROM 12/10-13/85 AUDIT Structures (Impell)

1. RWST:

a) Justification for the use of 2-D model for the SASSI analysis b) Information to explain why the response (acceleration) at top of the tank is lower than that of the slashing water mass.

2. Secondary Steel Members - Inelastic Behavior/Secant Stiffness:

a) Applicability of allowable ductility factor of "3" to the primary steel structural members, e.g. structural support beams and columns.

NOTE: The allowable ductility factor for primary structural members is in the range of 1.3 - 2 (NUREG/CR-0098).

b) Calculation of Secant Stiffness for the case of multiple pipes supported by a single beam.

Piping (Impell)

1. Strain Criteria for Piping:

a) Adequacy of allowing the pipe stress at several adjacent areas beyond SEP limits, e.g. FW-05.

b) Application of strain criteria to small bore piping.

(i) Applicability of strain criteria to small bore pipes for which strains were computed by hand calculation.

(ii)

Increase sample size of audit.

(iii)

Justification for calculation No. "SPAN-1" as compared to Project Instruction

2. Penetrations:

a) Combination of seismic loads induced from small bore pipe nozzles located inside and outside of containment b) Adequacy of stress calculation done in the calculation No. LTS-PEN-3.

c) Increase sample size of penetration audit.

3. Decoupling Criteria.

Cases of piping stress calculations in which the decoupling criteria have not been met (ref., 9/19/85 SER).

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4. Items not yet audited:

a) Catalog items b) Weld allowable stresses c) Near - Proximity Snubbers Electrical Cable Tray/Conduit Supports (Impell)

Adequacy of anchor bolts attached to the masonry walls to support electrical raceway, especially for the case of cracked masonry walls induced by a seismic event, and concern of replacing these anchor bolts by through-bolts.

Electrical Equipment Anchorages (Bechtel)

1. Documentation demonstrating electrical equipment anchor embedments have been evaluated for seismic loading.

2. No evaluation for the load associated with top mounted cables; e.g. Calculation No. S-A-01, item #4 (MCC-1&1A).

3. Adequacy of Calculated frequencies for equipment:

a) Consideration of cabinet door in structural rigidity.

b) Consideration of the flexibility of either the equipment itself or anchorage and supports, but not the combination of the two.

4. Consideration of base flats flexibility in the evaluation of anchorage.

5. No evaluation for the pressurizer instrument rack.

6. Documentation of the base plate weld for the pressurizer instrument cabinet.