ML13308A131

Summary of 820507 Meeting W/Util & Bechtel in Bethesda,Md Re Surveillance of Containment Tendons

ML13308A131
Person / Time
Site:	San Onofre
Issue date:	05/11/1982
From:	Rood H Office of Nuclear Reactor Regulation
To:	Office of Nuclear Reactor Regulation
Shared Package
ML13308A132	List: ML13308A131
References
TAC-45405, TAC-45406, TAC-54864, TAC-54865, TAC-54876, TAC-54877, NUDOCS 8205280571
Download: ML13308A131 (6)

Text

Docket Nos.:

50-361/362 APPLICANTS: Southern California Edison Company (SCE)

San Diego Gas and Electric Company s

City of Anaheim, California City of Riverside, California FACILITY:

San Onofre Nuclear Generating Station, Units

SUMMARY

OF MEETING TO DISCUSS TENDON SURVEILLANCE On May 7, 1982, members of the NRC staff met with SCE and Bechtel (BPC) in Bethesda, Maryland to discuss surveillance of the San Onofre 2 and 3 containment tendons. Attendees at the meeting are given in Enclosure 1.

The meeting agenda is given in Enclosure 2. During the introductory discussion, SCE stated that their objective in requesting the meeting was to present to the staff their approach to meeting condition 2.c.(4) of the San Onofre Unit 2 operating license, which requires SCE to provide for NRC approval and to implement, within 3 years of the date of issuance of the license, a tendon surveillance program which will meet the guidelines of Regulatory Guides 1.35 and 1.35.1.

First Year Tendon Surveillance - Unit 2 SCE summarized the recently completed (February 1982) first year tendon surveillance conducted at San Onofre 2. The slides used in this presentation are given in Enclosure 3. This surveillance was conducted about 3 1/2 years after the initial tendon tensioning and initial tendon liftoff force measurement. Based on the 1st year surveillance results, SCE concluded that the tendons are functioning properly, liftoff forces are slightly greater than expected, the tendons, anchors, and associated hardware look good, there has been no additional corrosion since installation, and the laboratory testing of tendon properties gave positive results.

Overall Tendon Surveillance Bechtel described the approach proposed to meet the San Onofre 2 license condition on tendon surveillance. The slides used in this presentation are given in Enclosure 4. The proposed acceptance criteria for liftoff force are:

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1. The liftoff force for each tendon tested shall be above the lower bound value.

2. The average of the fiftoff forces for all tendons tested shall be above the design prestress value.

These criteria would allow one or more tendons to be above the lower bound value but below the design value, for tendons where the lower bound value falls below the design value during the lifetime of the plant. SCE and Bechtel stated that this meets the requirements of the regulatory guides referenced 'in the license condition. Further, they stated that a tendon falling below the design value does not compromise safety because analyses have shown that if a tendon fails totally, the load-bearing capabilities of the containment would be reduced by only 6%, and the design conservatism of the containment is greater than 6%.

The staff agreed to consider the proposal and it was agreed that there would be a conference call to discuss the issue further in a few weeks.

At this point SCE distributed a draft report summarizing their proposed tendon surveillance program (See Enclosure 5).

Other Agenda Items Also discussed at the meetin were proposed revisions to the tendon surveillance technical specifications, and the Structural Integrity Test/Integrated Leak Rate Test conducted for both Units 2 and 3. The SIT/ILRT results generally showed that the measured containment displacements, at an internal test pressure of 69 psi, were within 5% to 20% of the predicted values.

Harry Rood, Project Manager Licensing Branch No. 3 Division of Licensing

Enclosures:

As stated cc:

See next page.

OFFICE DL:LB#3 DL

.3 SURNAMEO HRood:.jb.Fla EATE 5/1/82 5/

/82 LNRC FORM 318 (10/80) NRCM 0240 OFFICIAL FRC)R)Pn C:C)Pv USGPO: 1980-329-824

Mr. Robert Dietch Vice President Southern California Edison Company 2244 Walnut Grove Avenue P. 0. Box 300 Rose-mead, California 91770 Mr.

Gary D. Cotton Mr. Louis Bernath San Diego Gas & Electric Comoany 101 Ash Street P. 0. Box 1831 San Diego, California 92112 cc: Charles R. Kocher, Esq.

Jamnes A. Seoletto, Esq.

Southern California Edison Coipany 2244 Walnut Grove Avenue P. 0. Box 800 Rosemead, California 91770 Orrick, Herrington & Sutcliffe ATTN:

David R. Pigott, Esq.

600 Montgomery Street San Francisco, California 94111 M'r. George Caravalho City Manager City of San Clemente 100 Avenido Presidio San Clemente, California 92672 Alan R. Watts, Esq.

Rourke & Woodruff Suite 1020 1055 North Main Street Santa Ana, California 92701 Lawrence Q. Garcia, Esq.

California Public Utilities Commission 5066 State Building San Francisco, California 94102 Mr. V. C. Hall Combustion Engineering, Incorporated 1000 Prospect Hill Road Windsor, Connecticut 06095

-2 cc:

Mr. S. McClusky Bechtel Power Corporation P. 0. Box 60860, Terminal Annex Los Angeles, California 90060 Mr. Mark Medford Southeni-California Edison Company 2244 Walnut Grove Avenue P. 0. Box 800 RosemeadL, California 91770 Henry Peters San Diego Gas & Electric Company P. 0. Box 1831 San Diego, California 92112 Ms. Lyn Harris Hicks Advocate for GUARD 3908 Calle Ariana San Clemente, California 92672 Richard J. Wharton, Esq.

.Uriversity of San Diego School of Law Environmental Law Clinic San Diego, California 92110 Phyllis M. Gallagher, Esq.

Suite 222 1695 West Crescent Avenue Anaheid, California 92701 Mr. A. S. Carstens 2071 Caminito Circulo Norte Mt. La Jolla, California 92037 Resident Inspector, San Onofre/NPS c/o U. S. Nuclear Regulatory Commission P. 0. Box 4329 San Clemente, California 92672 Charles E. McClung, Jr., Esq.

Attorney at Law 24012 Calle de la Plata Suite 330 Laguna Hills, California 92653 77:

-77.

ATTENDEES SAN ONOFRE 2/3 TENDON SURVEILLANCE MEETING ON 5-7-82 NAME ORGANIZATION H. Rood NRC - DL R. E. Lipinski NRC -

SEB H. N. Nazarian BPC/Eng.

Supv.

0. Gurbuz BPC D. R. Hoffman NRC/Technical Specifications E. J. Weinkam NRC/STS J. K. Yann SCE Civil/Structural T. d. Mercurio SCE Licensing D. C. Jeng NRC - DE H. Ashar NRC -

RES AGENDA TENDON SURVEILLANCE REQUIREMENTS SAN ONOFRE UNITS 2 & 3 May 7, 1982 I.

Introduction T. 0. Mercurio II. First Year Tendon Surveillance Unit 2 J. K. Yann III. Overall Tendon Surveillance

0. Gurbuz IV.

Technical Specification J. K. Yann V.

Structural Integrity Test/

Integrated Leak Rate Test Unit 3

0.

Gurbuz