ML20056E081

Forwards SE Accepting Licensee 890308,910301 & 911217 Responses to NRC Bulletin 88-011, Pressurizer Surge Line Thermal Stratification Evaluation. Utils Should Verify Applicability of Bounding Analysis in CEN-387-P,Rev 1

ML20056E081
Person / Time
Site:	San Onofre
Issue date:	08/02/1993
From:	Fields M Office of Nuclear Reactor Regulation
To:	Guiles E, Ray H SAN DIEGO GAS & ELECTRIC CO., SOUTHERN CALIFORNIA EDISON CO.
Shared Package
ML20056E082	List: ML20056E081 ML20056E085
References
IEB-88-011, IEB-88-11, TAC-M72164, TAC-M72165, NUDOCS 9308190309
Download: ML20056E081 (3)

Text

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o UNITED STATES g

NUCLEAR REGULATORY COMMISSION n

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E WASHINGTON, D. C. 20555 g

August 2, 1993 I

Docket Nos. 50-361 and 50-362 Mr. Harold B. Ray Mr. Edwin A. Guiles Senior Vice President Vice President i

Southern California Edison Co.

Engineering and Operations Irvine Operations Center San Diego Gas & Electric Co.

23 Parker. Street 101 Ash Street Irvine, California 92718 San Diego, California 92112 Gentlemen:

SUBJECT:

SAFETY EVALUATION FOR COMBUSTION ENGINEERING OWNERS GROUP REPORT CEN-387-P, REVISI.ON 1, " PRESSURIZER SURGE LINE THERMAL STRATIFICATION EVALUATION" (BULLETIN 88-11) (TAC NOS. M72164 AND M72165)

By letters dated March 8, 1989, March 1, 1991, and December 17, 1991, you responded to NRC Bulletin 88-11 and indicated that you were participating in the Combustion Engineering Owners Group (CE0G) effort to evaluate pressurizer surge -line thermal stratification. The staff and its consultant, Brookhaven National Laboratory, have completed their review of the CEOG Report CEN-387-P,

" Pressurizer Surge Line Flow Stratification." The staff concludes that the CE0G analysis adequately demonstrates that the bounding surge line and nozzles meet ASME Code stress and fatigue requirements for the 40-year design life of the facility considering the phenomenon of thermal stratification and thermal striping. The staff's safety evaluation of CEN-387-P, Revision 1, is enclosed.

Action 1.d of Bulletin 88-11 required licensees to up'date their stress and fatigue analyses to ensure compliance with applicable Code requirements.

The

'CE0G Report can be used to update plant-specific Code stress reports as required by Item 1.d.

Please verify the applicability of the CEOG bounding analysis in CEN-387-P, Revision I to San Onofre Units 2 and 3.

In addition, please confirm that all actions required by Bulletin 88-11, including the updating of the plant-specific stress and fatigue analyses required by Action 1.d, have been completed. Your response is' requested within 90 days of receipt of this letter.

Please note that the staff's safety evaluation states that due to the fact that.the elastic-plastic analysis was necessary in performing the pressurizer -

surge line stress evaluation, the staff concurs with BNL's recommendation for performing enhanced inservice inspections to provide additional confidence in the structural integrity of the surge lines. Therefore, the staff recommends

.that licensees perform volumetric examination of critical elbow components as part of future ASME Section XI inservice examinations.

Examinations of elbow I'

bodies, as well as elbow welds, should-be performed to ensure that the most highly-stressed areas have not sustained damage.

These additional 1

9308190309 930802 DR ADOCK'0500 1

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e August 2, 1993 t

Messrs. Ray and Guiles 1 i

examinations are a staff recommendation only. As such, you may implement the recommendation on a voluntary basis.

It is requested that in your 90-day response noted above, that you inform the NRC whether you intend to implement the recommendation.

This request is covered by Office of Management and Budget Clearance Number 3150-0011, which expires June 30, 1994. The estimated average number of burden hours was already accounted for in the original bulletin, NRC Bulletin 88-11, " Pressurizer Surge Line Thermal Stratification", dated March 29, 1989.

The issuance of the enclosed safety evaluation completes all licensing actions related to the subject TAC numbers.

Your response to the information requested in this letter confirming that all the actions required by Bulletin 88-11 have been completed will be used to establish the implementation date for this Multiplant Action (MPA X-811).

Sincerely, Original signed by:

1 Mel B. Fields, Project Manager Project Directorate V Division of Reactor Projects III/IV/V Office of' Nuclear Reactor Regulation

Enclosure:

Safety Evaluation cc w/ enclosure:

See next page DJSTRIBUTION:

' Docket File NRC & Local PDRs PDV Reading File JRoe EAdensam TQuay MFields DFoster-Curseen JShea, 14E21 i

OGC, 15B18 ACRS, P315 (10) i KPerkins, RV J

OFFICE PDV/LA m fu PDV/PM PDV/D _..

DFosterkurseen MFi d [

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KAME DATE' X /?] /93

[/ R/93 I / F /93 0FFICIAL RECORD COPY DOCUMENT NAME: S072164.LTR 4

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Messrs. Ray and Guiles -

examinations are a staff recommendation only. As such, yoy may implement the recommendation on a voluntary basis.

It is requested that in your 90-day response noted above, that you inform the NRC whether you intend to implement the recommendation.

This request is covered by Office of Management and Budget Clearance Number 3150-0011, which expires June 30, 1994. The estimated average number of burden hours was already accounted for in the original bulletin, NRC Bulletin 88-11, " Pressurizer Surge Line Thermal Stratification", dated March 29, 1989.

The issuance of the enclosed safety evaluation completes all licensing actions related to the subject TAC numbers.

Your response to the information requested in this letter confirming that all the actions required by Bulletin 88-11 have been completed will be used to establish the implementation date for this Multiplant Action (MPA X-811).

Sincerely, g;cdf FAA Mel B. Fields, Project Manager Project Directorate V Division of Reactor Projects III/IV/V Office of Nuclear Reactor Regulation

Enclosure:

Safety Evaluation cc w/ enclosure:

See next page

Messrs. Ray and Guiles San Onofre Nuclear Generating

-Southern California Edison Company Station, Unit Nos. 2 and 3 cc:

James A. Beoletto, Esq.

Mr. Richard J.

Kosiba, Project Manager Southern California Edison Company Bechtel Power Corporation Irvine Operations Center 12440 E. Imperial Highway 23 Parker Street Norwalk, California 90650 Irvine, California 92718 Mr. Robert G. Lacy Chairman, Board of Supervisors Manager, Nuclear Department County of San Diego San Diego Gas & Electric Company 1600 Pacific Highway, Room 335 P. O. Box 1831 San Diego, California 92101 San Diego, California 92112 Alan R. Watts, Esq.

Mr. Steve Hsu Rourke & Woodruff Radiologic Health Branch 701 S. Parker St. No. 7000 State Department of Health Services Orange, California 92668-4702 Post Office Box 942732 Sacremento, California 94234 Mr. Sherwin Harris Resource Project Manager Public Utilities Department City of Riverside Resident Inspector / San Onofre NPS 3900 Main Street c/o U.S.

Nuclear Regulatory Commission Riverside, California 92522 Post Office Box 4329 San Clemente, California 92674 Mr-. Charles B. Brinkman, Manager Washington Nuclear Operations ABB Combustion Engineering Nuclear Power Mayor 12300 Twinbrook Parkway, Suite 330 City of San Clemente Rockville, Maryland 20852 100 Avenida Presidio San Clemente, California 92672 Mr. R. W. Krieger, Station Manager Regional Administrator, Region V Southern California Edison Company U.S. Nuclear Regulatory Commission San Onofre Nuclear Generating Station 1450 Maria Lane, Suite 210 P. O. Box 128 Walnut Creek, California 94596 San Clemente, California 92674-0128 Mr. Don J. Womeldorf Chief, Environmental Management Branch California Department of Health Services 714 P Street, Room 616

-Sacramento, California 95814