ML20155E001

Forwards RAI Re 980616 Request for Amends to TSs to Allow Operation with Reduce Cold Leg Temp & Change RCS Flow Measurment from Mass to Volumetric Indication

ML20155E001
Person / Time
Site:	San Onofre
Issue date:	10/30/1998
From:	Clifford J NRC (Affiliation Not Assigned)
To:	Ray H SOUTHERN CALIFORNIA EDISON CO.
References
TAC-MA2238, TAC-MA2239, NUDOCS 9811040118
Download: ML20155E001 (3)

Text

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October 30, 1998 l Mr. Harold B. Ray Executive Vice President

, Southem Califomia Edison Company San Onofre Nuclear Generating Station  :

7 P. O. Box 128 San Clemente, Califomia 92674-0128

SUBJECT:

REQUEST FOR ADDITIONAL INFORMATION ON CHANGE TO TCOLD REDUCTION AND RCS FLOW MEASUREMENT TECHNICAL SPECIFICATION (TAC NOS. MA2238 AND MA2239)

Dear Mr. Ray:

In a letter dated June 16,1998, Southem Califomia Edison (SCE) submitted a request for amendment to the San Onofre Nuclear Generating Station (SONGS) Units 2 and 3 technical specifications to (1) allow operation with a reduce cold leg temperature, and (2) change reactor coolant system (RCS) flow measurement from mass to volumetric indication.

To complete our review, we request that you provide the additional information identified in the enclosure within 30 days of receipt of this letter. Your timely response to the request for additional information will assist us in completing our review. This information and the schedule have been discussed with your licensing manager.

} Please call me at 301-415-1352 if you have any questions.

Sincerely, Original Signed By 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 DISTRIBUTION:

and 50-362 Docket File PUBLIC

Enclosure:

Request for Additional Information PDIV-2 R/F I EAdensam

/

WBateman cc w/ encl: See next page JClifford EPeyton OGC {- TCollins MShuaibi [ DOCUMENT NAME: SOA2238.RAI To receive a copy of this document. Indicate in the box: "C" = Copy without enclosures "E" = Copy with enclosures "N" = No copy OFFICE PDIV,2/PfA PDIV-2/LAm NAME JCliffSt' EPe"yfoPl' DATE 10)/98 104Y98 OFFICIAL RECORD COPY 9811040118 981030

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, ,. . - . - .- _ ._ . . - - - . . - . - ~~.-.--.--- l ! s i I Mr. Harold B. Ray October 30, 1998 cc w/ encl: Mr. R. W. Krieger, Vice President 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 l San Clemente, Califomia 92674-0128 Mayor  !

Chairman, Board of Supervisors City of San Clemente County of San Diego 100 Avenida Presidio l 1600 Pacific Highway, Room 335 San Clemente, Califomia 92672 San Diego, Califomia 92101 Mr. Dwight E. Nu in, Vice President Alan R. Watts, Esq. Southem Califomie cdison 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 Utilities Department Cit;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. Michael Olson San Onofre Liaison San Diego Gas & Electric Company P.O. Box 1831 San Diego, Califomia 92112-4150 Mr. Steve Hsu Radiologic Health Bre- '.

State Department of Health Services Post Office Box 942732 l Sacramento, Califomia 94234 l

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ENCLOSURE REQUEST FOR ADDITIONAL INFORMATION TECHNICAL SPECIFICATION CHANGE FOR TCOLD AND RCS FLOW MEASUREMENT SOUTHERN CALIFORNIA EDISON COMPANY SAN ONOFRE UNITS 2 AND 3 DOCKET NOS. 50-361 AND 50-361 l

1. Unlike mass flow rate which is constant in a given loop, the volumetric flow rate is a function of temperature and will therefore be different for a cold leg than for the corresponding hot leg. The Bases for Surveillance Requirement 3.4.1.3 allows the use of a heat balance betwsan the primary and secondary to calculate the flow rate.

However, neither the TS nor the Bases for the surveillance requirement state that the flow rate limit applies strictly to the cold leg. Please modify your submittal to include such a statement orjustify your proposed wording. J

2. On page 3, you stated, 'for accident analyses that can be affected by elevated flow rates, a flow rate which is conservatively large compared to baseline measured flow is used." Please provide and justify the flow rate used. In yourjustification, be sure to provide supporting data regarding the maximum flow that can be provided by the pumps.

3. Please provide the following information regarding the high pressurizer pressure trip value and the main steam safety valve open setpoint used in your analysis of the loss of condenser vacuum event with concurrent single failure. Discuss instrument uncertainties, tolerance, and/or accumulation as applicable. For the main steam safety valves, the TS lift setpoi,nt vary from 1085 psig to 1140 psig. Discuss how this was modeled in the analyses.}}