ML13333A652
| ML13333A652 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 12/23/1987 |
| From: | Medford M SOUTHERN CALIFORNIA EDISON CO. |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| GL-87-12, NUDOCS 8712290355 | |
| Download: ML13333A652 (3) | |
Text
Southern California Edison Company P. 0.
BOX 800 2244 WALNUT GROVE AVENUE ROSEMEAD, CALIFORNIA 91770 M. 0. MEDFORD TELEPHONE MANAGER OF NUCLEAR ENGINEERING (818) 302-1749 AND LICENSING December 23, 1987 U. S. Nuclear Regulatory Commission Attention:
Document Control Desk Washington, D.C.
20555 Gentlemen:
Subject:
Docket No. 50-206 Generic Letter 87-12 San Onofre Nuclear Generating Station Unit 1 By letter dated September 24, 1987, Southern California Edison provided the response to Generic Letter 87-12 for San Onofre Unit 1. The response to Question 4 of the Generic Letter addressed various plant conditions and procedural controls associated with operations while the reactor coolant system (RCS) is partially filled. In that response, it was stated that interferences (hoses, cables, etc.) were not allowed to be routed through the personnel hatches of the containment any time the RCS is partially filled (in order to effect the prompt securing of the containment in case of loss of decay heat removal capability).
Further analysis of this matter has led to the conclusion that such interferences can and should be permitted in the same manner as they are for the equipment hatch, provided that the capability to secure the containment 8712290355 O71223 D50206 PDR ADOCK PDR P
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Document Control Desk December 23, 1987 within four hours is maintained. Accordingly, enclosed is a revised response to Question 4 of the Generic Letter. Associated implementing procedures will be in place prior to operation with the RCS partially filled.
If you have any questions, please let me know.
Subscribed on this fife day of a l
1987.
Respectfully submitted, SOUTHERN CALIFORNIA EDISON COMPANY By:A.Z Lz1 M. 0. Medford Manager of Nucl r Engineering and Licensing Subscribed and sworn tp before me this ef J day of ///
Los Angeles, State of California NotaryPublic-California LOS ANGELES COUNTY My Comm. Exp. Sep. 14. 1990 My Commission Expires:
'10,1Z1V9,704 Enclosure cc:
D. Hickman, NRR Project Manager, San Onofre Unit I J. B. Martin, Regional Administrator, NRC Region V F. R. Huey, NRC Senior Resident Inspector, San Onofre Units 1, 2 and 3
OUESTION 4:
"A description of the containment closure condition you require for the conduct of operations while the RCS is partially filled. Examples of areas of consideration are the equipment hatch, personnel hatches, containment purge valves, SG secondary-side condition upstream of the isolation valves (including the valves), piping penetrations, and electrical penetrations."
RESPONSE
Containment closure capability within four hours is required by the procedures any time the RCS is partially filled.
For this purpose, points of quick disconnect are required adjacent to the personnel hatch, the emergency (escape) hatch and the equipment hatch, and piping and electrical penetrations are maintained intact (capable of closure).
Since an adequate RCS make up supply is required during periods when the RCS is partially filled, containment closure within four hours will provide added assurance that the health and safety of the public is not endangered if the emergency makeup/core cooling water supply were to subsequently fail.
Further assurance is provided by:
- 1) the redundant level monitoring equipment which will help to ensure an early response to a change in RCS inventory; 2) training and procedural guidance to ensure rapid and proper identification of abnormal plant conditions during partially filled RCS operations, and to ensure appropriate actions are taken to correct the abnormal conditions as necessary; 3) administrative controls to ensure the RCS inventory and inventory control system are not challenged by maintenance and testing activities.