ML13330A112
| ML13330A112 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 09/22/1980 |
| From: | Baskin K Southern California Edison Co |
| To: | Crutchfield D Office of Nuclear Reactor Regulation |
| References | |
| TASK-03-10.A, TASK-05-11.A, TASK-06-07.C1, TASK-08-03.B, TASK-3-10.A, TASK-5-11.A, TASK-6-7.C1, TASK-8-3.B, TASK-RR NUDOCS 8009290348 | |
| Download: ML13330A112 (2) | |
Text
Southern California Edison Company P.O. BOX 800 2244 WALNUT GROVE AVENUE ROSEMEAD, CALIFORNIA 91770 September 22, 1980 Director of Nuclear Reactor Regulation Attention: D. M. Crutchfield, Chief Operating Reactors Branch #5 Division of Licensing U.S. Nuclear Regulatory Commission Washington, D.C. 20555 Gentlemen:
Subject:
Docket No. 50-206 Systematic Evaluation Program San Onofre Nuclear Generating Station Unit 1 Your letter of July 3, 1980 forwarded completed topic assessments for four SEP topics. That letter indicated that the topic assessments compared San Onofre Unit 1 as described in the docket to current licensing criteria. You requested that we inform you of differences in the Unit 1 design from that described in the topic assessments. The results of our review of the topic assessments are provided as an enclosure to this letter.
If you have any questions regarding the enclosed please let me know.
Very Truly Yours, K. P. Baskin Manager of Nuclear Engineering, Safety and Licensing Enclosure 8OO929o3Yr
III-10.A Thermal-Overload Protection for Motors of Motor-Operated Valves Based on our review of this topic assessment, the facts upon which this assessment is based are correct.
V-II.A Electrical, Instrumentation and Control Features for Isolation of High and Low Pressure Systems.
On page 4, the second paragraph discusses an SIS subsystem which utilizes the refueling water pumps or the charging pumps to provide borated water from the refueling water storage tank to each RCS leg. It should be clarified that this is not a subsystem or an additional SIS train but an alternate method for providing safety injection which is available in the event the preferred path for safety injection has failed. As indicated in Volume III, Section 4.1.3 of the San Onofre Unit 1 FSAR, the preferred path for safety injection is the safety injection pump and feedwater pump trains.
This path for injection into the RCS is automatically actuated upon a safety injection signal. In addition, one charging pump is automatically aligned to inject borated water into the loop A charging line and the refueling water pumps are automatically aligned to provide borated water to the containment spray system.
VI-7.C.1 Independence of Redundant Onsite Power Systems In paragraph 3.1.1, the last sentence should be clarified to indicate that this condition exists with the 480v switchgear.
In paragraph 3.2.1, the last sentence should be clarified to indicate "One charger of each train..."
VIII-3.B DC Power System Bus Voltage Monitoring and Annunciation Reference 2 should be Regulatory Guide 1.47.
Section 2.0 lists eleven indications and alarms that should be provided in the control room. It is not clear what the basis for the eleven parameters is since the guidance provided in References 1 and 2 are general requirements. Since this basis is apparently provided in Reference 3, an internal NRC memorandum, this document should be made available to SCE for review and comment as part of this topic assessment.