ML20197C685

Forwards Amend Applications 172 & 158 for Licenses NPF-10 & NPF-15,revising TS 3.4.9, Pressurizer, to Reduce Allowable Pressurizer Water Volume for Pressurizer Operability

ML20197C685
Person / Time
Site:	San Onofre
Issue date:	12/19/1997
From:	Nunn D SOUTHERN CALIFORNIA EDISON CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML20197C687	List: ML20197C685 ML20197C700 ML20197C728
References
NUDOCS 9712240250
Download: ML20197C685 (4)

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EDISOS *=-

Vice President An UVWN lARJtVWOML Compan) -

December 19, 1997 U. S. Nuclear Regulatory Connission Attention: Document Control Desk Washington, D..C. 20555 Gentlemen:

Subject:

Docket Nos. 50-361 and 50-362 Amendment Application Nos. 172 and 158 San Onofre Nuclear Generating Station Units 2 and 3 Enclosed are Amendment Application Nos.172 and 158 to facility Operating Licenses NPF-10 and NPF-15, for the San Onofre Nuclear Generating Station, Units 2 and 3, respectively. These amendment applications consist of Proposed ChangeNumber470(PCN-470).

PCN-470 is a request to revise Technical Specification 3.4.9, Pressurizer, to reduce the allowable pressurizer water volume for pressurizer operability.

The associated Technical Specification Bases changes are included for information. The allowable water volume is also revised to a percent pressurizer level. This change is necessary to be consistent with a revised pressurizer level instrumentation Total Loop Uncertainty (TLU). This revised TLU was calculated as part of a program to evaluate instrument loop uncertainties for instruments used for Technical Specification surveillances.

As a result of this change in pressurizer level instrumentation TLU certain events described in Chapter 15 of the Updated Final- Safety Analysis Report (UFSAR) were reanalyzed. The results of the reanalysis of those events are also provided for information in the form of proposed UFSAR Chapter 15 changes.

To maintain conservative plant operation pressurizer level is administrative 1y controlled to below 57% until the NRC approves this proposed change.

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Document Control Desk If you have any questions regarding this proposed change, please.let me know.

Sincerely.

Enclosures cc: E. W. Merschof f, Regional Administrator, NRC' Region IV K. E. Perkins, Jr., Director, Walnut Creek Field Office, NRC Region IV J. A. Sloan, NRC Senior Resident Inspector, San Onofre Units 2 & 3 M. B. Fields, NRC Project Manager, San Onofre Units 2 and 3 S. Y. Hsu, Department of Health Services, Radiologic Health Branch

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UNITED STATES OF AMERICA-NUCLEAR REGULATORY COMMISSION Application of SOUTHERN CALIFORNIA ) Docket No. 50-361 EDISON COMPANY, El E 'for a Class 103- )-

License.to Acquire, Possess, and Use )

a Utilization Facility as Part of ) Amendment Application Unit No. 2 of the San Onofre Nuclear ) No. 172 Generating Station )

SOUTHERN CALIFORNIA EDIS0N COMPANY, El R. pursuant to 10-CFR 50.90, hereby submit Amendment Application No. 172.

This amendment application consists of Proposed Change Number (PCN) NPF-10-470 to facility Operating License No. NPF-10. PCN NPF-10-470 is a request to revise the Unit 2 Technical Specification 3.4.9, " Pressurizer," to be consistent with certain Updated final Safety Analysis Report Chapter 15 events which "ere recently reanalyzed. The proposed change will reduce the pressurizer water level required for operability.

Subscribed on this day of Offi%b4#,1997 Respectfully submitted, SOUTHERN CALIFORNIA EDIS0h COMPANY By . --

DwightE.Nkn Vice President e -

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State of California County.of San Diego

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On l9 071 efor me,/ kM 00 Sb ,

personally appeared (t h r;hPF;. tJ ttrud , personally known to me to be the person whose name is subscribed to the within instrument and acknowledged to me that he executed the same in his authorized capacity, and that by his signature on the instrument the person, or the entity upon-behalf of which the person acted, executed the instr..a...t.

WITNESS my hand and official seal.

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