ML20237D460

Forwards RAI Re GL 97-04, Assurance of Net Positive Suction Head for ECC & Containment Heat Removal Pumps. Response Requested within 45 Days from Date of Ltr

ML20237D460
Person / Time
Site:	San Onofre
Issue date:	08/19/1998
From:	Clifford J NRC (Affiliation Not Assigned)
To:	Ray H SOUTHERN CALIFORNIA EDISON CO.
References
GL-97-04, GL-97-4, TAC-MA0040, TAC-MA0041, TAC-MA40, TAC-MA41, NUDOCS 9808260204
Download: ML20237D460 (3)

Text

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{ August 19e 1998

-i Mr. Harold Bi Ray.

Executive Vice President

. Southern California Edison Company 1 San Onofre Nuclear Generating Station P. O. Box 128 I San Clemente, California 92674-0128 )

SUBJECT:

REQUEST FOR ADDITIONAL INFORMATION - SAN ONOFRE NUCLEAR GENERATING STATION UNITS 2 AND 3 (TAC NOS. MA0040 AND MA0041)

Dear Mr. Ray:

' On October 7,1997, the U.S. Nuclear Regulatory Commission (NRC) issued Generic Letter (GL) 97-04, " Assurance of Net Positive Suction Head for Emergency Core Cooling and Containment Heat Removal Pumps," to all holders of operating licenses or construction permits.

The NRC issued GL 97-04 to have licensees provide information necessary to confirm the adequacy of the net positive suction head (NPSH) available for emergency core cooling and

. containment heat removal pumps.

In response to GL 97-04. you provided a letter dated January 2,1998. The staff has reviewed j your response and has determined that additional information is necessary. Please provide the  !

information in the enclosed request within 45 days from the date of this letter, if you have any questions regarding this matter, please contact me at (301) 415-1352.

Sincerely, Original Signed By 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.- JClifford PUBLIC MGray

Enclosure:

Request for Additional Information PDIV-2 Reading DSkay EAdensam EPeyton ,

- cc w/enci: See next page JKudrick, NRR OGC KKavanagh ACRS t

"" ]'$ RCaruso PGwynn, RIV DKirsch, RIV WCFO }

f WBateman  ;

DOCUMENT NAME: MA0040. SNG To receive a copy of this document, indicate in the box: "C" = Copy without enclosures "E* = Copy with enclosures "N" = No copy L OFFICE - PDIV-2/PS PDIV_-2/LA _ l NAME- JCliffdW EPe W l DATE- 08/l9/98 08/R!98 i g-OFFICIAL RECORD COPY < O EC FfE MiE B BCPV 9808260204 980819 '

PDR ADOCK 05000361 P PM * .

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1. A.

h Mr. Harold B. Ray Augus't 19, 1998 cc w/ encl:

Mr. R. W. Krieger, Vice President Resident inspector / San Onofre NPS Southern California Edison Company c/o U.S. Nuclear Regulatory Commission San Onofre Nuclear Generating Station Post Office Box 4329 P. O. Box 128 San Clemente, California 92674 San Clemente, California 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, California 92668-4702 San Clemente, California 92674-0128 Mr. Sherwin Harris Resource Project Manager Public Utilities Department 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. Paul Schneringer 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 Services Post Office Box 942732 Sacramento, Califomia 94234 l

{ .- ]

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'f REQUEST FOR ADDITIONAL INFORMATION GENERIC LETTER 97-04. " ASSURANCE OF ADEQUATE NPSH FOR ECCS AND CONTAINMENT HEAT REMOVAL PUMPS" SOUTHERN CALIFORNIA EDISON COMPANY SAN ONOFRE NUCLEAR GENERATING STATION. UNITS 2 AND 3 DOCKET NOS. 50-361 AND 50-362

1. What is the maximum sump temperature assumed in the net positive suction head (NPSH) analyses?

~

2. Tables 1,3, and 4 in the GL response list the NPSH required for the containment spray pumps as 13 feet. . However, the flowrate provided in Tables 1 and 3 is 2200 gpm whereas the flow ' ate in Table 4 is 2500 gpm. Explain why the NPSH required did not increase with the 300 gpm increase in flow.

3. Have there been any other revisions to the NPSH calculations other than those discussed in response to question 3 of the subject Generic Letter?

i

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