ML13310A775

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Advises of Westinghouse Owners Group Schedule for Response to TMI Item II.K.3.5, Automatic Trip of Reactor Coolant Pumps. Two-part Program Will Be Undertaken.Parts 1 & 2 Scheduled for Completion by 830731 & 831231,respectively
ML13310A775
Person / Time
Site: San Onofre 
Issue date: 05/10/1983
From: Krieger R
Southern California Edison Co
To: Crutchfield D
Office of Nuclear Reactor Regulation
References
TAC 44128, TASK-2.K.3.05, TASK-TM NUDOCS 8305120166
Download: ML13310A775 (2)


Text

Southern California Edison Company P. 0. BOX 800 2244 WALNUT GROVE AVENUE ROSEMEAD. CALIFORNIA 91770 May 10, 1983 Director, Office of Nuclear Reactor Regulation Attention: D. M. Crutchfield, Chief Operating Reactors Branch No. 5 Division of Licensing U. S. Nuclear Regulatory Commission Washington, D.C. 20555 Gentlemen:

Subject:

Docket No. 50-206 TMI Action Item II.K.3.5, "Automatic Trip of Reactor Coolant Pumps" San Onofre Nuclear Generating Station Unit 1

Reference:

Letter, K. P. Baskin, SCE, to D. G. Eisenhut, NRC, TMI Action Item II.K.3.5, "Automatic Trip of Reactor Coolant Pumps,"

April 8, 1983 The referenced letter provided you with our preliminary assessment of the actions necessary to respond to the subject post-TMI requirement.

Since our schedule is dependent upon the Westinghouse Owner's Group (WOG) schedule, it is the purpose of this correspondence to inform you of the WOG schedule.

Westinghouse and WOG will undertake a two part program to address the requirements of NRC letters 83-10 c and d based on the aforementioned positions for the purpose of providing more uniform RCP trip criteria and methods of determining those criteria. In the first part of the program, revised RCP trip criteria will be developed which provides an indication to the operator to trip the RCP's for small break LOCA's requiring such action, but will allow continued RCP operation for steam generator tube ruptures, less than or equal to a double-ended tube rupture. The revised RCP trip criteria will also be evaluated against other non-LOCA transients and accidents,.where continued RCP operation is desirable, in order to demonstrate that a need to trip the RCP's will not be indicated to the operator. Since this study is to be utilized for emergency response guideline development, better estimate assumptions will be applied in the consideration of the more likely scenarios.

The first part of the program will be completed and incorporated into Revision 1 of the Emergency Response Guidelines developed by Westinghouse for WOG. The scheduled date for completion of Revision 1 is July 31, 1983.

8305120166 830510 1I PDR ADOCK 05000206 P

PDR

Mr. D.

May 10, 1983 The second part of the program is intended to provide the required justification for manual RCP trip. This part of the program must necessarily be done after the completion of the first part of the program.

The schedule for completion of the second part of the program is the end of 1983.

As stated in the referenced letter, the ultimate resolution of this issue for San Onofre Unit 1 will most likely require some plant specific work to be performed by Westinghouse. It is anticipated that we will be able to provide a schedule for the completion of items 1 and 2 of the referenced letter within 30 days of completion of the WOG generic work. We will attempt to provide you with schedular information on a phased schedule along with completion of the WOG generic work. If the completion of the first part of the program does not yield any substantive conclusions then we will not be able to provide you with a final schedule for resolution of the RCP trip issue for San Onofre Unit 1 until January 31, 1984.

If you have any questions regarding this schedule, please let me know.

Very truly yours, R. W. Krieger Supervising Engineer San Onofre Unit 1 Licensing