ML20195E498

Forwards Application for Amends 188 & 173 to Licenses NPF-10 & NPF-15 for SONGS Units 2 & 3,respectively.Amends Would Revise TS 3.5.2,3.1.9,3.7.1 & 5.1.7.5 Re Small Break LOCA Charging Flow & Main Steam Safety Valve Setpoints

ML20195E498
Person / Time
Site:	San Onofre
Issue date:	06/08/1999
From:	Nunn D SOUTHERN CALIFORNIA EDISON CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML20195E504	List: ML20195E498 ML20195E506 ML20195E517
References
TAC-M85945, TAC-M85946, NUDOCS 9906110171
Download: ML20195E498 (3)

Text

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f% . SOUTHERN CAuf ORNM

1. EDISON 0%""""

An EDISONINTERNATIONAL'" Company i

June 8,1999 U. S. Nuclear Regulatory Commission l Attention: Document Control Desk Washington, D.C. 20555 l Gentlemen: i

Subject:

Docket Nos. 50-361 and 50-362 Proposed Technical Specification Change NPF-10/15-495 Small Break LOCA Charging Flow and Main Steam Safety Valve Setpoints San Onofre Nuclear Generating Station Units 2 and 3

Reference:

Letter from Mel B. Fields NRC to Harold B. Ray SCE dated November 23, 1994, subject: Issuance of Amendment for San Onofre Nuclear Generating Station, Unit 2 (TAC No. M85945) and Unit 3 (TAC No. M85946).

Enclosed are Amendment Application Numbers 188 and 173 to Facility Operating Licenses NPF-10 and NPF-15 for San Onofre Nuclear Generating Station (SONGS)

Units 2 and 3, respectively. The Amendment Applications consist of Proposed Change Number NPF-10/15-495 (PCN 495). PCN-495 is provided as an Enclosure to this letter.

- The Small Break Loss of Coolant Accident (SBLOCA) has been re-evaluated using the NRC approved ABB Combustion Engineering (ABB-CE) S2M evaluation model. Based on this re-evaluation:

a Charging flow is not required to mitigate the effects of the SBLOCA

. The maximum as-found lift pressure positive tolerance of Main Steam Safety Valves (MSSVs) Pressure Safety Valve (PSV)-8401 and PSV-8410 i l

can be increased from +1% to +2% of the lift setting.

The evaluation of the SBLOCA for SONGS Units 2 and 3 was performed in accordance with the NRC criteria for use of the ABB-CE S2M model.  !

k kD 0 1 U P. O. Box 128  :

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San Clemente. CA 92674-0128 949-368-1480 l'ax 949-3681490

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n Document Control Desk June 8, 1999-The amendment requests are to:

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Delete the TS 3.5.2 "ECCS - Operating" requirement for charging pump

. operability. .SR 3.5.2.6 currently requires verifying that each charging pump develops a flow of greater than or equal to 40 gpm. This requirement is based upon the credit for charging flow that was taken in j the original SBLOCA analysis. This amendment request is to delete all s credit for the charging system as an Emergency Core Cooling System.

- (ECCS) component. The Bases of TS 3.5.2, "ECCS - Operating" would  ;

also be revised to delete all references to the charging system being a requirement for the ECCS.

Ensure the operability of the charging pumps by adding Surveillance Requirement (SR) 3.1.9.5 to Technical Specification (TS) 3.1.9 "Boration Systems - Operating." SR 3.1.9.5 verifies each charging pump is operable in accordance with the Inservice Testing Program.

Revise Technical Specification 3.7.1 " Main Steam Safety Valves (MSSVs)"

Table 3.7.1-2 to change the as-found tolerance on MSSVs 2(3)PSV-8401-and 2(3)PSV-8410 from +1%/-3% to 42%/-3% of the lift setting. _ Technical Specification Table 3.7.1-2 spr. ss rif Main Steam Safety Valves (MSSVs) other than 2(3)-PSV-84Ci one. 2(3)-PSV-8410 have an as-found lift tolerance of +2%/-3%. As discussed in Amendments 114 (Unit 2) and 103 (Unit 3) (Reference) the as-found tolerance on 2(3)-PSV-8401 and 2(3)-PSV-8410 was specified to be +1%/-3% because the SBLOCA event was not reanalyzed to support changing the tolerance on these valves to

+2%/-3%. The current SBLOCA reanalysis supports an as-found lift tolerance of +2%/-3% on 2(3)-PSV-8401 and 2(3)-PSV-8410. Therefore, these amendment requests propose removal of footnote " "" to TS Table 3.7.1-2, which imposes the +1%/-3% as-found tolerance on 2(3)-PSV-8401 -

and 2(3)-PSV-8410.

. Revise Technical Specification 5.7.1.5 " Core Operating Limits Report (COLR)" to list the ABB-CE S2M t DLOCA evaluation model as an acceptable method for determining linear heat rate.

Document Control Desk June 8, 1999 Also included for information are the following associated Bases and Updated Final Safety Analysis Report (UFSAR) changes:

i Draft of changes to the Bases of TS 3.5.2 "ECCS - Operating" to delete all references to the charging system being a part of the ECCS.

Draft of changes to the Bases of TS 3.1.9 "Boration Systems - Operating" to discuss the new SR 3.1.9.5.

. Draft of proposed changes to the UFSAR Sections 6.3.3, "ECCS Small Break Analysis" and 15.6.3.3.3.2, "Small Break LOCA."

if you have any questions regarding this amendment application, please contact me or Mr. Jack l_. Rainsberry (949) 368-7420.

Sincerely, l

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j Enclosure cc: E. W. Merschoff, Regional Administrator, NRC Region IV J. A. Sloan, NRC Senior Resident inspector, San Onofre Units 2 and 3 i L. Raghavan, NRC Project Manager, San Onofre Units 2 and 3 l S. Y. Hsu, Department of Health Services, Radiological Health Branch  !

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