ML20151V959

Requests That Util Provide Addl Info Concerning License Amend Request for Turbine Missile protection,PCN-494

ML20151V959
Person / Time
Site:	San Onofre
Issue date:	09/10/1998
From:	Clifford J NRC (Affiliation Not Assigned)
To:	Ray H SOUTHERN CALIFORNIA EDISON CO.
References
TAC-MA2186, TAC-MA2187, NUDOCS 9809150116
Download: ML20151V959 (4)

Text

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, September 10, 1998' r

C Mr. Harold B. Ray i Executive Vice President Southern California Edison Company  !

San Onofre Nuclear Generating Station P. O. Dox 128 i San Clenisnte, California 92674-0128  :

SUBJECT:

REQUEST FOR ADDITIONAL INFORMATION RELATED TO LICENSE  ;

AMENDMENT REQUEST FOR TURBINE MISSILE PROTECTION,'

PCN-494 (TAC NOS. MA2186 AND MA2187)

)

Dear Mr. Ray:

in a letter dated June 12,1998, Southern California Edison (SCE) submitted a request for  !

amendment to the licenses for San Onofre Nuclear Generating Station (SONGS) Units 2 and 3,  :

which would revise the turbine missile protection calculation methodology described in the  !

SONGS licensing basis. In order to complete our review, we request that you provide the adduioni:! Information identified in the enclosure.

Your timely response would allow us to expeditiously complete this review. l Please contact me at (301) 415-1352 if you have any questions.

Sincerely, I Original Signed By Mel Gray for '

James W. Clifford, Senior Project Manager Project Directorate IV-2 l Division of Reactor Projects ill/IV Office of Nuclear Reactor Regulation Docket Nos. 50-361 DISTRIBUTION:

and 50-362 Docket File EPeyton PUBLIC OGC

Enclosure:

Request for Additional PDIV-2 R/F . ACRS Informatm EAdensam DKirsch,.RIV WCF0 j WBateman . TPGwynn, RIV  ;

cc w/ encl: See next page - JClifford GGeorgiev, ECGB ,

MGray ~

I DOCUMENT NAME: SOMA 2186.RAI j OFC PDIV-2/PM PDIV-2 PDIV-;! - EkQBh NAME- EPeyGF uGr 'y' V JEiifM/c" fB&hi '

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3 p \',i DATE ~ 9/ lCV98 9/h /98 9/h /98 9/ te /98 OFFICIAL RECORD COPY 9909150116 980910 PDR ADOCK 05000361 gm RE CENTER COPY

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2 j NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20066-0001

% # September 10, 1998 Mr. Harold B. Ray Executive Vice President Southern California Edison Company San Onofre Nuclear Generating Station P. O. Box 128 San Clemente, California 92674-0128

SUBJECT:

REQUEST FOR ADDITIONAL INFORMATION RELATED TO LICENSE AMENDMENT REQUEST FOR TURBINE MISSILE PROTECTION, PCN-494 (TAC NOS. MA2186 AND MA2187)

Dear Mr. Ray:

In a letter dated June 12,1998, Southem California Edison (SCE) submitted a request for Emendment to the licenses for San Onofre Nuclear Generating Station (SONGS) Units 2 and 3, which would revise the turbine missile protection calculation methodology described in the SONGS licensing basis, in order to complete our review, we request that you provide the additionalinformatio'11dentified in the enclosure.

Your t;mely response would allow u= to expeditiously complete t% review.

Please contact me at (301) 415-1352 if you have any questions.

Sincerely, l

f. f EUC-James W. Clifford, Senior Project Manager Project Directorate iV-2 Division of Reactor Projects lil/IV Office of Nuclear Reactor Regulation Docket Nos. 50-361 and 50-362

Enclosure:

Request for Additional Information cc w/ encl: See next page 7

r' Mr. Harold ts. Ray September 10, 1998 cc w/ encl:

Mr. R. W. Krieger, Vice Piesident Resident inspector / San Onofre NPS Southern Califomia Edison Company c/o U.S. Nuclear Regulatory Commission San Onofre Nuclear Generating Station Post Office 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, California 92101 Mr. Dwight E. Nunn, Vice President

, Alan R. Watts, Esq. Southern California Edison Company Woodruff, Spradlin & Smart San Onofre Nuclear Generating Station 701 S. Parker St. No. 7000 P.O. Box 128 Orange, Califomia 92668-4702 San Clemente, Califomia 92674-0128 Mr. Sherwin Harris Resource Project Manager Public Uti!ities 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. Paul Schneringer San Onofre Liaison San Diego Gas & Electric Company P.O. Box 1831 San Diego, Califomia 92112-4150 Mr. Steve Hsu Radiologic Health Branch State Department of Health Services Post Office Box 942732 Sacramento, Califomia 94234

s' 4

i REQUEST FOR ADDITIONAL INFORMATION MISSILE TURBINE PROTECTION CALCULATION METHODOLOGY SOUTHERN CALIFORNIA EDISON COMPMiY SAN ONOFRE NUCLEAR GENERATING STATION. UNITS 2 AND 3 DOCKET NOS. 50-361 AND 50-362

1. Please provide the operating experience with the proposed new welded design turbine rotor. How many of those rotors are currently in service? Where and how long have ,

the rotors been in service? i

2. What is the material specification for the rotor (i.e., ASTM specification)? What is the specified minimum and maximum yield strength for the rotor material? What is the minimum specified fracture toughness of the material?

3. The June 12,1998, submittal indicates that the center of the rotor will not be bored to remove impurities and facilitate future UT examinations. Please provide the basis for this decision.

4. The June 12,1998, submittal is not sufficiently clear as to the scope of the turbine retrofit project. Will the control system be modified? Will the turbine valve testing be modified? The submittal indicates that a ten-year turbine inspection interval and monthly testing of the steam valves supports the total annual probability of failure at any speed of 1 x 10E-5 per unit year. Is SONGS committed to perform these inspections and tests at these intervals?

5. Piease provide a description of the welded turbine rotor design and sketches for staff evaluation of the design. Include information that describes how the blades are attached to the disk. Include information that describes how the riisk is attached to the rotor forging. Also identify the design improvements that are responsible for the 50 percent tangential stress reduction for the welded rotor.

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