ML20203E706

Forwards SER Accepting 980105 Request to Use Mechanical Nozzle Seal Assembly as Alternative Repair Method Per 10CFR50.55a(a)(3)(i) for Plant,Units 2 & 3

ML20203E706
Person / Time
Site:	San Onofre
Issue date:	02/17/1998
From:	Bateman W NRC (Affiliation Not Assigned)
To:	Ray H SOUTHERN CALIFORNIA EDISON CO.
Shared Package
ML20203E711	List: ML20203E706 ML20203E730
References
TAC-M99558, TAC-M99559, NUDOCS 9802270113
Download: ML20203E706 (3)

Text

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fa wAsHiwotoN, D.C. 30666-0001 February 17, 1998

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Mr. Harold B. Ray Executive Vice President Southern Califomia Edison Company San Onofre Nuclear Generating Station P. O. Box 128 San Clemente, Ca!ifomia 92674-0128

SUBJECT:

USE OF THE MECHANICAL NOZZLE SEAL ASSEMBLY FOR THE SAN ONOFRE NUCLEAR GENERATING STATION, UNITS 2 AND 3 (TAC NOS.

M99558 AND M99559)

Dear Mr. Ray:

In a letter dated January 5,1998, Southem Califomia Edison (SCE) submitted a request to use the mechanicai nonle seal assembly (MNSA) as an attemate repair method pursuant to 10 CFR 50.55a(a)(3)(i) for the San Onofre Nuclear Generating station (SONGS), Units 2 and 3.

This letter revised SCE's original relief request contsined in its letter dated July 11,1997, to use the MNSA as an alternate ASME Code replacement pursuant to 10 CFR 50.55a(g)(5)(iii).

SCE's letter dateo December 12,1997, also revised the original relief request by requesting NRC approval to:

1. Use the MNSAs as an interim repair on the inconel alloy 600 lower hot leg nonles should leakage from any of these non ae identified during the SONGS Units 2 and 31998 mid-cycle outages. The MNSAs will be removed at the next refueling outages for the SONGS units, and ali Inconel alloy 600 nonles will be replaced with Inconel alloy 690 aoules. ,

2. Use the MNSAs as an interim repair on the inconel alloy 600 steam generator channelinstrument nonles should leakage from any of these noules be identified during the SONGS Units 2 and 3 mid-cycle outages

3. Install the MNSAs on a interim basis on the inconel alloy 600 pressurizer nonles regardless of whether any leakage is identified during the SONGS Units 2 and 3 mid-cycle outages.

4. Finally, approvalis requested to use on a permanent basis the MNSAs installed on the steam generator channel and pressurizer instrument nonles.

The s2ff has completed its review of the licensee's request tc use the MNSAs, and our findings are contained in the enclosed safety evaluation. The staff concludes that, pursuant to 10 CFR 50.55a(a)(3)(i), the use of MNSAs as an attemate to an ASME Section XI Code repair is I permissible for the interim period (from the Unit 2 and 31998 mid-cycle outages until the next refueling outages for the SONGS units) requested by the licensee, since it is found to provide , / eq an acceptable level of quality and safety. Di U I e

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9902270113 980217 PDR ADOCK 05000361 e eoa 11 !! lIl!I,Ill,I,1ll

Mr. Harold B. Ray 2 February 17, 1998 The staff's review of the licensee's request to use the MNSAs on a permanent basis in the locations identified above w.!! be evaluated separately. Our review of the proposed permanent use of the MNSAs is contingent on resolution of the long term effects of the degradation mechanisms identified in the enclosed safety evaluation. Within 45 days of the date o' ~

letter the licensee should provide detailed information regarding the augmented ir x program and address the potential for long term degradation and corrosion of the MN:sAs.

Sincerely, Original Signed By William H. Bateman, Project Director Project Directorate IV-2 Division of Reactor Projects lil/IV

, Office of Nuclear Reactor Regulation Docket Nos. 50-361 QlSTRIBUTION:

and 50-362 Docket File PUBLIC

Enclosure:

Safety Evaluation PDIV-2 R/F EAdensam WBateman cc w/ encl: See next page MFields EPeyton OGC ACRS KPerkins, RIV WCFO PGwynn, RIV TSullivan DWessman DOCUMENT NAME: SO99558.LTR To receive a copy of thle document, Indicete in the box: "C" = Copy without enclosures "E" = Copy with enclosures *N" = No copy OFFICE PDIV-2/PE._, PDIV-2/LA OGQ8&f M"1 4 PDIV-2/PD .

,n NAME MFiegsff EPeyton.a.,ap jf7/R4,44 WBateman /it)/(\6 D, ATE 02PJS8 024/98 ~02/)ys8 / l 02/f/98 OFFICIAL RECORD COPY

Mr. Harold B. Ray - -3 February 17, 1998-cc w/ encl:

Mr. R. W : rieger, Vice President - Resident inspector / San Onofre NPS

-Southem California Edison Company clo U.S. Nuclear Regulatory Commission San Onofre Nuclear Generating Station Post Of0ce Box 4329 P. O. Box 128 San Clemente, Califomia 92674 San Clemente, Califomia 92674-0128 Mayor -

Chairman, Board of Supervisors City of San Clemente County of San Diego 100 Avenida Presidio 1600 Pacific Highway, Room 335 San Clemente, Califomia 92672 San Diego, Califomia 92101 Mr. Dwight E. Nunn, Vice President Alan R. Watts, Esq. Southem Califomia Edison Company Woodruff, Spradlin & Smart San Onofre Nuclear Generating Station 701 S. Parker St. No. 7000 P.O. Box 128 Orange, California 92668-4702 San Clemente, California 92674-C128 Mr. Sherwin Harris .

- Resource Project Manager Public Utilities Department City'of Riverside 3900 Main Street Riverside, Califomia 92522 Regional Administrator, Region IV U.S. Nuclear Regulatory Commission Harris Tower & Pavilion 611 Ryan Plaza Drive, Suite 400 Arlington, Texas 76011-8064-Mr. Terry Winter Manager, Power Operations San Diego Ces & Electric Company P.O. Box 1831 T San Diego, Califomia 92112-4150 Mr. Steve Hsu .

Radiologic Health Branch State Department of Health Services Post Office Box 942732

~ Sacramento, Califomia 94234

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