ML20198H149
| ML20198H149 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 12/18/1998 |
| From: | Clifford J NRC (Affiliation Not Assigned) |
| To: | Ray H SOUTHERN CALIFORNIA EDISON CO. |
| References | |
| TAC-MA3541, TAC-MA3542, NUDOCS 9812290249 | |
| Download: ML20198H149 (4) | |
Text
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4 December'.18,71998 Mr. Harold B. Ray Executive Vice President Southern California Edison Company San Onofre Nuclear Generating Stat:on P. O. Box 128 San Clemente, California 92674-0128
SUBJECT:
REQUEST FOR ADDITIONAL INFORMATION ON CHANGE TO PRESSURIZER SAFETY VALVE GETPOINT TOLERANCE (TAC NOS. MA3541 AND MA3542)
Dear Mr. Ray:
In a letter dated September 4,1998, Southem California Edison (SCE) submitted a request for amendment to the San Onofre Nuclear Generating Station (SONGS) Units 2 and 3 technical specifications to incorporate a modification to the setpoint tolerance for the pressurizer safety valves.
To allow us to complete our review of your proposed amendment, we request that you provide the additional information identified in the enclosure within 60 days of receipt of this letter. This information and the schedule have been discussed with Mr. Jack Rainsberry of your staff.
Please call me at (301) 415-1352 if you have any questions.
Sincerely, Original Signed by Mel Fields for James W. Clifford, Senior Project Manager Project Directorate IV-2
. Division of Reactor Projects Ill/IV Office of Nuclear Reactor Regulation Docket Nos. 50-361 DISTRIBUTION:
and 50-362 Docket File CLiang PUBLIC GHammer
Enclosure:
Request for Additional PDIV-2 R/F EPeyton Information EAdensam OGC WBateman TCollins cc w/enci: See next page JClifford DTerao ACRS PGwynn, Region IV GPick, Region IV DOCUMENT NAME: G:\\SOA3541.RAI To receive a copy of this document, Indicate in the 1:ox: "C" = Copy without enclosures "E" = Copy with enclosures *N" = No copy k
OFFICE PDIV-2/PNL PDIV-2/LA l
NAME JCliffofff72r-EPeyton _9^F DATE 12//P/98 12/17/98 i
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UNITED STATES I
NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 200666 December 18, 1998 Mr. Harold B. Ray Executive Vice President Southem Califomia Edison Company San Onofre Nuclear Generating Station P. O. Box 128 San Clemente, Califomia 92674-0128
SUBJECT:
REQUEST FOR ADDITIONAL INFORMATION ON CHANGE TO PRESSURIZER SAFETY VALVE SETPOINT TOLERANCE (TAC NOS, MA3541 AND MA3542)
Dear Mr. Ray:
l in a letter dated September 4,1998, Southem Califomia Edison (SCE) submitted a request for amendment to the San Onofre Nuclear Generating Station (SONGS) Units 2 and 3 technical specifications to incorporate a modification to th, setpoint tolerance for the pressurizer safety j
valves.
To allow us to complete our review of your proposed amendment, we request that you provide the additional information identified in the enclosure within 60 days of receipt of this letter. This 1
information and the schedule have been discussed with Mr. Jack Rainsberry of your staff.
Please call me at (301) 415-1352 if you have any questions.
Sincerely,
//
v W James W. Clifford, Senior Project Manager Project Directorate IV-2 Division of Reactor Projects Ill/IV Office of Nuclear Reactor Regulation Docket Nos. 50-361 and 50-362
Enclosure:
Request for /.dditional information cc w/ encl: See next page k
4 1
Mr. Harold B. Ray December 18, 1998 cc w/ encl:
Mr. R. W. Krieger, Vice President Resident inspector / San Onofre NPS Southem Califpmia 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, California 92672 San Diego, Califomia 92101 Mr. Dwight E. Nunn, Vice President Alan R. Watts, Esq.
Southem California Edison Company Woodruff, Spradlin & Smart San Onofre Nuclear Generating Station 701 S. Parker St. No. 7000 P.O. Box 128 Oranga, Califomia 92668-4702 San Clemento, Califomia 92674-0128 Mr. Sherwin Harris Resource Project Manager Public Utilities Department 4
City of Riverside 3900 Main Street Riverside, California 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, California 92112-4150 Mr. Steve Hsu Radiologic Health Branch State Department of Health Semices Post Office Box 942732
. Sacramento, Califomia 94234 L
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I REQUEST FOR ADDjTIONAL INFORMATION CHANGE TO PRESSURIZER SAFETY VALVE SETPOINT TOLERANCE SOUTHERN CALIFORNIA EDISON COMPAjiY f
SAN ONOFRE! UNITS 2 AND 3 DOCKET NOS. 50-361 AND 50-362 1.
Uncertainties of analysis parameters should be accounted for in the safety analyses used to justify new limits in the plant technical specification (TS). Provide a discussion of the pressurizer safety valve (PSV) setpoint testing instrument accuracy and how this source of uncertainty is accounted for in the licensee's safety analysis associated with the proposed +3/-2% TS PSV setpoint tolerance.
2.
Provide verification that the functional capability of all safety-related power-operated i
(motor-operated,' air-operated, and hydraulically-operated) valves has been evaluated l
for the larger differential pressure loads resulting from the increased TS PSV setpoint tolerance.
3.
Provide the results of your evaluation of the impact from the proposed change of tolerance to pressurizer safety valve settings on your Small Break LOCA analysis.
4.
The proposed change to TS Bases B 3.4.10 indicates that the allowable peak transient system pressure is 120% of design pressure for all limiting faulted events. This is not l
the staff's understanding. The staff has accepted the results of the main feedwater line l
break analysis with a transient peak pressure not exceeding 120% of its design pressure at San Onofre in its original licensing review. This acceptance was based in part on a consideration that a double ended main feedwater line break at San Onofre Units 2 and 3 is a "very low probability event" as claimed by SCE. Thus, the 120% limu applies only to double-ended main feedwater line breaks at SONGS Units 2 and 3, and not for other limiting fault events as stated on page B.3.4-52 of your proposed change.
The 120% limit was applied using the criteria described in the acceptance criteria section of SRP 15.2.8. Please revise your proposed TS B.3.4.10 to define the pressure i
limit for the generalized description of the acceptance criteria for all limiting faulted l.
events to 110% of design pressure.
5.
Proposed UFSAR Extion 15.5.1.1.3, item C has eliminated the description of the transient minimum DNBR for the event. Please describe the purpose of this change,
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including how you will continue to account for all appropriate fuel performance criteria.
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