ML13303B184

Forwards Amend Applications 69 & 55 to Licenses NPF-10 & NPF-15,respectively,consisting of Proposed Tech Spec Change NPF-10/15-275 Re Refueling Interval Surveillances

ML13303B184
Person / Time
Site:	San Onofre
Issue date:	01/08/1990
From:	Ray H SOUTHERN CALIFORNIA EDISON CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML13303B186	List: ML13303B184 ML20005G012 ML20005G013
References
NUDOCS 9001170491
Download: ML13303B184 (4)

Text

ACCELERATED DJBUTION DEMONSTkTION SYSTEM REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS)

ACCESSION NBR:9001170491 DOC.DATE: 90/01/08 NOTARIZED: YES DOCKET #

FACIL:50-361 San Onofre Nuclear Station, Unit 2, Southern Californ 05000361 50-362 San Onofre Nuclear Station, Unit 3, Southern Californ 05000362 AUTH.NAME AUTHOR AFFILIATION RAYH.B. Southern California Edison Co..

RECIP.NAME RECIPIENT AFFILIATION R Document Control Branch (Doc ent.Contr'ol Dek)

SUBJECT:

Forwards Amend Applications 69 & 55 to Licenses NPF-10 &

NPF-15,respectively,consisting of PTSC NPF-10/15-275.

DISTRIBUTION CODE: A001D COPIES RECEIVED:LTR / ENCL SIZE:(

TITLE: OR Submittal: General Distribution NOTES:

RECIPIENT COPIES RECIPIENT COPIES ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL PD5 LA 1 PD5 PD 1 1 D KOKAJKO,L. 5 INTERNAL: ACRS 6 NRR/DET/ECMB 9H 1 NRR/DOEA/OTSB11 1 NRR/DST 8E2 1 NRR/DST/SELB 8D 1 NRR/DST/SICB 7E 1 NRR/DST/SRXB 8E 1 NUDOCS-ABSTRACT 1 1i 1 OGC/HDS2 1 0 9

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PLEASE HELP US TO REDUCE WASTE! CONTACT THE.DOCUMENT CONTROL DESK, ROOM Pl-37 (EXT. 20079) TO ELIMINATE YOUR NAME FROM DISTRIBUTION LISTS FOR DOCUMENT'S YOU DON'T NEED!

TOTAL NUMBER OF COPIES REOUIRED: LTTR 27 ENCL m~

1~

4

Southern California Edison Company P.O. BOX 800 2244 WALNUT GROVE AVENUE HAROLD B. RAY TELEPHONE VICE PRESIDENT ROSEMEAD, CALIFORNIA 91770 818-302-2281 January 8, 1990 U. S. Nuclear Regulatory Commission Attention: Document Control Desk Washington D.C. 20555 Gentlemen:

Subject:

Docket Nos. 50-361 and 50-362 Amendment Applications Nos. 69 and 55 San Onofre Nuclear Generating Station Units 2 and 3

Reference:

1. SCE to NRC letter, dated May 15, 1989, regarding Proposed Change NPF-10-290 San Onofre Units 2 and 3 are presently operating on a nominal 24 month fuel cycle. In order to complete these fuel cycles without an unnecessary and burdensome outage to perform "refueling" interval surveillances prior to the end of each fuel cycle, SCE has been involved in a program to extend "refueling" interval surveillances from 18+25% months to 24+25% months. The refueling interval extension was accomplished for the first 24 month fuel cycle for San Onofre Unit 2 cycle 5 through a combination of Technical Specification changes and one time exemptions. San Onofre Unit 3 is expected to complete its first 24 month fuel cycle and start the SONGS 3 cycle V refueling on April 14, 1990.

Technical Specification changes have been previously submitted for all but four of the Technical Specification changes required to allow uninterrupted operation until the presently anticipated refueling date. This letter transmits one of the remaining four requests for Technical Specification changes. Companion letters have been mailed on this date requesting two of the remaining three Technical Specification changes. The fourth, and final Technical Specification change request is forecast to be transmitted to the NRC in approximately six weeks. The refueling interval surveillances associated with these technical specification changes start to come due on April 3rd, 1990. SCE requests approval of this and the associated 3 other changes prior to April 3rd, 1990 in order to avoid an unnecessary shutdown.

The attachments to this letter comprise Amendment Application No. 69 to Facility Operating License NPF-10 and Amendment Application No. 55 to Facility Operating License NPF-15 for San Onofre Nuclear Generating Station, Units 2 and 3, respectively. These Amendment Applications consist of Proposed Technical Specification Change NPF-10/15-275 (PCN-275).

PDC

Document Control Desk January 8, 1990 PCN -275 is a request to revise San Onofre Units 2 and 3 Technical Specification 3/4.3.1, "Reactor Protective Instrumentation," to increase the interval for refueling interval surveillance tests which are currently performed every 18 months, to each refueling, nominally 24 months and maximum 30 months. As the result of modifying the surveillance interval, changes are proposed to the Reactor Protective instrumentation setpoints in Technical Specification 2.2.1, Table 2.2-1; the High Logarithmic Power Level response time in Technical Specification 3/4.3.1, Table 3.3-2; and the Linear Power Level calibration tolerance in Technical Specification 3/4.3.1, Table 4.3-1.

The technical evaluation to justify the surveillance interval extension performed a comprehensive review of all of the Reactor Protective instrumentation. The evaluation consisted of a comparative analysis of all Preventive Maintenance (PM) surveillances, a PM history review for all instruments, a statistical evaluation of instruments impacted by drift and a setpoint analysis. Where necessary to preserve the margin of safety and/or to maintain adequate operating margins, setpoint changes are proposed based on changes to the Safety Analysis and changes to the trip setpoint calculations. This approach augments that which was submitted, by Reference 1, in support of Proposed Change NPF-10-290 (PCN 290) which requested a one-time exemption to the instrumentation calibration surveillance intervals for San Onofre Unit 2. Operating margin to Core Protection Calculator (CPC) generated trips has not been changed.

Based upon our evaluations we have concluded that extending the surveillance interval of Reactor Protective Instrumentation to a nominal 24 months, or maximum 30 months, will not have an adverse affect on Technical Specification operability requirements. The 30 month interval is the maximum 25% extension of the surveillance interval permitted by Technical Specification 4.0.2.

If you have any questions regarding this information, please call me.

Very truly yours, lrold B. Ray Vice Presiden 275LET.LCF Enclosures cc: J. B. Martin, Regional Administrator, NRC Region V C. Caldwell, NRC Senior Resident Inspector, San Onofre Units 1, 2 and 3