ML13317B069
| ML13317B069 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 03/26/1982 |
| From: | Baskin K Southern California Edison Co |
| To: | Crutchfield D Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8204070467 | |
| Download: ML13317B069 (2) | |
Text
Southern California Edison Company P. 0. BOX 800 2244 WALNUT GROVE AVENUE ROSEMEAD. CALIFORNIA 91770 K. P. BASKIN MANAGER OF NUCLEAR ENGINEERING, March 26, 1982 SAFETY, AND LICENSING 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 Safety Injection System Modification San Onofre Nuclear Generating Station Unit 1 By letter dated February 18, 1982, we submitted a tabulation of the corrected SIS valve opening force data obtained from the November 1, 2, 23 and 24, 1981 hot SIS tests.
On February 27, 1982, we completed the required hot SIS test and advised you by telephone on March 1, 1982 of the results.
This letter provides written notification of the results of that test.
The calculated opening force for HV-851A was 120 pounds force and for HV-851B was 4520 pounds force as indicated in the table below.
As indicated to you by telephone, the small force required to open HV-851A has been attributed to the different times in which the valves started to open.
Valve HV-851B started to open 1.27 seconds before HV-851A. Since the valves discharge into a common header, the pressure around HV-851A appeared to have equalized by the time it started to open.
In fact, pressure indication domnstream of HV-851A was 40 pounds greater than upstream. This could have pushed the downstream disc off its backseat so that the only opening force necessary would be that needed to lift the discs and stem.
Hot SIS Test HV-851 A&B Opening Force Data Discharge Upstream Opening Accumulator Manifold Line Force Valve Pressure (PSI)
Pressure (PSI)
Pressure (PSI)
(Lbf)
HV-851A 2940 2340 266 120 HV-851B 2640 1800 284 4520 204070467 82O032 06 PDR AD OCK 05000206
Mr. D.
Mar 9 26, 1982 If you have any questions or desire further information concerning the test results discussed above, please contact me.
Very truly yours, cc: R. H. Engleken, Director, OIE, Region V