ML20199B723

Addresses TS 3.8.1,Action B.2 for San Onofre Nuclear Generating Station,Units 2 & 3.Licensee Preparing Change to Bases for Action 3.8.1.B.2,to Specify Critical Components & Associated TSs

ML20199B723
Person / Time
Site:	San Onofre
Issue date:	11/12/1997
From:	Rainsberry J SOUTHERN CALIFORNIA EDISON CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
NUDOCS 9711190066
Download: ML20199B723 (2)

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EDISON 0%"Le, AA l'lWOW l.%TERWf0M1* Gunpanv November 12, 1997-4 U. S. Nuclear Regulatory Commission Attention: Document Control Desk

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~ Washington, D.C. 20555 Gentlemen:

Subject:

' Docket Nos. 50-361 and 50-362 Technical Specification 3.8.1 San Onofre Nuclear Generating Station Units 2 and 3

~ This letter addresses Technical Specification 3.8.1, Action B.2 for San Onofre Nuclear Generating Station, Units 2 and 3.

For one required diesel generator

-(06) inoperable, Action 3.8.1.B.2 states:

Declare required feature (s) supported by the inoperfle DG inope:able when its redundant required feature (s) is inoperable.

The first sentence of the Basis for Action 3.8.1.B.2 states:

Requircd Action.B.2 is intended to provide assurance-that a loss of l

offsite power, during the period that a DG is inoperable, does not result in a complete loss of safety function of critical systems.

Southern California Edison (SCE) has historically interpreted this Action L

statement to apply to critical accident mitigation equipment which relies on j_

either offsite power or a DG for motive power; e.g., pumps and valves. The specific components are listed in San Onofre procedures.

SCE does not apply this action to instrumentation which is connected to a tattery backed source.

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'It is.our understanding that this is consistent with the general industry interpretation of this Action statement.

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,In order to clearly define the required actions, SCE is prepa ing a change to the Bases'for Action 3.8.1.B.2, which will specify the critical components and L

their associated Technical Specifications. This change will be provided to l/

the NRC by November 21, 1997, for information or approval, as appropriate, in accordance with the provisions of the Bases control program in Technical

[0CI Specification 5.4.

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If_yoe have any. questions regarding'this information, please let us know.

Ve-y truly yours, A,-

cc:

E._W. Merschoff, 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 l

M. B. Fields. NRC Project Manager, San Onofre Units 2 and 3

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