ML13322A766
| ML13322A766 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 06/12/1980 |
| From: | Crutchfield D Office of Nuclear Reactor Regulation |
| To: | Dietch R Southern California Edison Co |
| References | |
| TASK-06-04, TASK-6-4, TASK-RR NUDOCS 8006300230 | |
| Download: ML13322A766 (4) | |
Text
. " JUN 1 2 1980 Docket No. 50-206 Mr. R. Dietch Vice President Nuclear Engineering and Operations Southern California Edison Company 2244 Walnut Grove Avenue Post Office Box 800 Rosemead, California 91770
SUBJECT:
SEP TOPIC VI-4, Containment Isolation System We are continuing our review of SEP Topic VI-4 and have found that additional information related to the containment purge and venting system for San Onofre Unit I described in the enclosure to this letter is needed.
We request your response within 30 days of your receipt of this letter.
Sincerbly, Original signed by:
- (haends iM.LO utchtfits'dtl;nthieifector Opi~ at pt tsB c h #5 Division of Licensing
Enclosure:
Request for Additional DISTRIBUTION:
Information Docket NRC PDR cc w/enclosure:
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- WASHINGTON, D. C. 20555 Id, JUN 12~ 1980 Docket No. 50-206 Mr.
R. Dietch Vice President Nuclear Engineering and Operations Southern California Edison Company 2244 Walnut Grove Avenue Post Office Box 800 Rosemead, California 91770
SUBJECT:
SEP TOPIC VI-4, Containment Isolation System We are continuing our review of SEP Topic VI-4 and have found that additional information related to the containment purge and venting system for San Onofre Unit 1 described in the enclosure to this letter is needed.
We request your response within 30 days of your receipt of this letter.
Sin erely, Dennis M. Crutchfield, Chi Operating Reactors Branch #5 Division of Licensing
Enclosure:
Request for Additional Information cc w/enclosure:
See next page
Mr-R. Dietch 0
cc Charles R. Kocher, Assistant Director, Technical Assessment General Counsel Division Southern California Edison Company Office of Radiation Programs Post Office Box 800 (AW-459)
Rosemead, California 91770 U. S. Environmental Protection Agency David R. Pigott Crystal Mall #2 SSamuel B. Casey Arlington, Virginia 20460 Chickering & Gregory Three Embarcadero Center U. S. Environmental Protection Twenty-Third Floor Agency San Francisco, California 94111 Region IX Office ATTN:
EIS COORDINATOR Jack E. Thomas 215 Freemont Street Harry B. Stoehr San Francisco, California 94111 San Diego Gas & Electric Company P. 0. Box 1831 San Diego, California 92112 Resident Inspector c/o U. S. NRC P. 0. Box AA Oceanside, California 92054 Mission Viejo Branch Library 24851 Chrisanta Drive Mission Viejo, California 92676 Mayor City of San Clemente San Clemente, California 92672 Chairman Board of Supervisors County of San Diego San Diego, California 92101 California Department of Health ATTN: Chief, Environmental Radiation Control Unit Radiological Health Section 714 P Street, Room 498 Sacramento, California 95814
ENCLOSURE San Onofre Unit 1 The docketed information as to the design of the containment purge and venting system includes SCEC letters dated 1/9/79, 12/14/79 and 1/15/80 and does not adequately address the concerns of the NRC generic letter on "Containment Purging during normal plant operation" dated 11/28/78. The following additional information is necessary in order to complete our evaluation of the electrical override/bypass aspects of the containment purge matter:
- 1. Provide the process and instrumentation diagram (P&ID) and schematic diagrams for the purge and vent system.
- 2. SCEC 1/9/79 letter indicates that when a manual override of the safety injection actuation signal is affected, this also overrides the contain ment spray actuation signal and the containment purge isolation valves.
The NRC guidelines require that, for any override, an annuciator be provided for each system impacted when the override is active. Describe how the San Onofre 1 design meets this guideline.
- 3. SCEC 1/9/79 letter describes that manual override of the safety injection actuation signal is accomplished by use of a manual "double-action block switch."
The NRC guideline requires that override controls have sufficient physical features (i.e., keylock switches or covered switches) to facilitate adequate administrative control.
Describe how the "double-action block switch" satisfies the NRC guideline.
- 4.
The NRC guideline requires signals which initiate containment isolation be derived from safety grade equipment. Discuss the qualification of the equipment providing the (a) high containment pressure, (b) high containment radiation and (c) safety injection actuation signals.
- 5. The NRC guideline requires that overriding or resetting of the isolation actuation signal does not cause automatic reopening of any isolation or purge valve. Discuss how the San Onofre Unit 1 design meets this guideline.
Note:
If any of the above specific information has been provided in response to "Lessons Learned" or "Bulletins and Orders" requests, the licensee may respond by identifying the date and title of the letter containing the information.
NOTE:
The following definitions are given for clarity of use in this issue:
Override - The signal is still present, and it is blocked in order to perform a function contrary to the signal.
Reset -
The signal has come and gone, and the circuit is being cleared to return to the normal condition.