ML20030D372
| ML20030D372 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 08/06/1981 |
| From: | Haynes J SOUTHERN CALIFORNIA EDISON CO. |
| To: | Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| References | |
| IEB-80-06, IEB-80-6, NUDOCS 8109010314 | |
| Download: ML20030D372 (2) | |
Text
.,. y Docket No. 50-206 Bulletin No. 80-06 Southern California Edison Company
$5 P O BOK 800 2 2 44 W ALNUT GROVE AVENUE ROSEMEAD C ALIFORNI A 91770 J. G. H AY N E S August 6, 1981
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C jf Attention: Mr. R. H. Engelken, Director y
DOCKET No. 50-206 o
SAN ON0FRE - UNIT 1 R
Dear Sir:
IE BULLETIN 80-06 ENGINEERED SAFETY FEATURE (ESF)
RESET CONTROLS Reference is made to your correspondence of March 13, 1980, forwarding IE Bulletin 80-06, and to our initial response dated June 9,1980.
In that response, we stated that a test demonstrating the validity cf the Engineered Safety Features (ESF) Reset Controls drawing review would be performed prior to return to power. This test was performed on May 9, 1981.
This letter transmits the results of that test.
All components remained in their safety conditions following reset of the safety injection sequencers, with the exception of FCV 1112, the SI annunciator, the event recorder, and M0V 1100 B, C, and D.
These components returneo to their normal conditions. The behavior of FCV 1112, the SI annurciator, and the event recorder were in accordance with our drawing re vi ew.
As discussed in our June 9,1980 letter, no corrective action is re(uired for these components. The failure of M0V 1100 B, C, and D to remain in the Emergency Mode on ESF reset was not predicted by the original drawing review. A subsequent review has revealed that these valves should have been expected to behave as they did.
The valves in question operate during safety injection to switch charging pump suction from the Volume Control Tank (VCT) to the Refueling Water Tank (RWT).
ESF reset would cause these valves to return to normal.
This would cause the charging pumps to be drawing from a potentially unborated source of water. Upon low level in the VCT, the valves would again operate to switch suction to the RWT.
$1p 0109010314 810806" PDR ADOCK 05000206 0
O Ms. R. H. Engelken, Director The temporary corrective action for this situation was, prior to return ta power operation, to revise the loss of coolant Emergency Operating Instreetion to require placing MOV 1100 B, C, and D controls in the emergency lineup manually prior to resetting the Safety Injection sequencers. This will prevent their return to normal upon ESF reset and wili preserve positive operator control of the system. This temporary corrective action is acceptable since (1) it involves only subsequent operator action and can be readily performed from the control room and (2) ESF reset requires manual action and cannot occur automatically. Therefore, no credit for immediate operator action need be taken.
This temporary corrective action was completed prior to return to power.
The permanent corrective action will be to modify the control circuitry for MOV 1100 B, C, and D to incorporate a seal in/ reset function on ESF actuation.
This action is scheduled to be completed during the next refueling outage.
Should you have any questions regarding this matter, please contact me.
Subscribed on this d
day of x.q
, 1981.
V Very truly yours, SOUTHERN CALIFORNIA EDIS0N COMPANY By
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J.G.Hdyneg Manager of Nuclear Operation Subscribed and sworry to before me this 4# day of /% m /
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My Comassen Esp. Aug.27,1982 l
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Nota /osAngeles,StateofCalifornia of L WGR:RN:0031 cc:
U. S. Nuclear Regulatory Commission Division of Reactor Operations Inspection L. F. Miller - USNRC Resident Inspector D. M. Crutchfield