ML13333A454
| ML13333A454 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 12/10/1979 |
| From: | Baskin K Southern California Edison Co |
| To: | Harold Denton, Ziemann D Office of Nuclear Reactor Regulation |
| References | |
| TASK-15-12, TASK-RR NUDOCS 7912180515 | |
| Download: ML13333A454 (2) | |
Text
Southern California Edison Company P. 0. BOX 800 2244 WALNUT GROVE AVENUE ROSEMEAD, CALIFORNIA 91770 K. P. BASKIN TELEPHONE
- MANAGER, GENERATION ENGINEERING 213-572-1401 December 10, 1979 Director, Office of Nuclear Reactor Regulation Attention:
D. L. Ziemann, Chief Operating Reactors Branch #2 Division of Operating Reactors U. S. Nuclear Regulatory Commission Washington, D. C.
20555 Gentlemen:
SUBJECT:
Docket No. 50-206 Monitoring of Control Rod Position San Onofre Nuclear Generating Station Unit 1 By letter dated November 5, 1979, you indicated that you have completed your review of Licensee Event Reports and Technical Specification requirements related to the Control Rod Position Indication Systems at Westinghouse Pressurized Water Reactors.
As a result of this review, you stated that you have decided to clarify potentially ambiguous specifica tions related to control rod misalignment for Westinghouse designed reactors.
Specifically, you requested that we review our present technical specifications to ensure that the control rods are required to be maintained within +/-12 steps indicated position and the rod position indication system is verified to be accurate to within 12 steps.
In addition, you requested that we inform you if this is not the case, together with our plans to correct the deficiencies.
The purpose of this letter is to advise you that we have completed our review of the San Onofre Unit 1 Technical Specifications in the areas discussed above.
Our review indicates that control rod misalignment limitations are not presently included in the technical specifications. Accordingly, we are evaluating, in conjunction with Westinghouse, corrective actions required to assure that control rod misalignment and instrument inaccuracy are accounted for when monitoring control rod position.
79121 So 515
Mr. D.
December 10, 1979 As suggested by your November 5, 1979 letter, corrective actions being considered include 1) revising our technical specifications to limit control rod misalignment to no more than that assumed in the safety analysis, 2) seeking relief by performing analysis justifying (with penalties, if needed) greater misalignment, or
- 3) proposing alternate or supplemental monitoring specifications to demonstrate compliance with the control rod misalignment limit.
With the cooperation of Westinghouse, a meeting has been scheduled during the week of December 17, 1979 to discuss this matter.
Subsequently, we plan to advise you by December 28, 1979 of any corrective actions, if necessary, we intend to implement to ensure that control rod misalignment and instrument inaccuracy are accounted for when monitoring control rod position.
If you have any questions or desire further information concerning this matter, please contact me.
Very truly yours, "G L