ML13322A756

Forwards Request for Addl Info Re Containment Purge & Venting Sys for SEP Topic VI-4 Re Containment Isolation Sys

ML13322A756
Person / Time
Site:	San Onofre
Issue date:	04/17/1980
From:	Ziemann D Office of Nuclear Reactor Regulation
To:	Dietch R Southern California Edison Co
References
TASK-06-04, TASK-6-4, TASK-RR NUDOCS 8005080087
Download: ML13322A756 (3)

Text

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~Docket NRC PDR Local PDR ORB Reading NRR Reading Docket No. 50-206 D. Eisenhut RVolliner OEL 0 OI&E (3) 086L. Z I HdV Mr. R. Dietch DLziemann Vice President HSrith Nuclear Engineering and Operations ABurger Southern California Edison Company NSIC 2244 Walnut Grove Avenue TERA Post Office Box 800 ACRS (16)

Rosemead, CAlifornia 91770 DCrotchfield CHofmayer

Dear MrD Dietch:

WShapaker

SUBJECT:

SEP TOPIC VI-4, Containment Isolation System We are continuing our review of SEP Topic TI-4 and have found that additional information related to the containment purge and venting system for San Onofre as described in the enclosure to this letter is needed.

We request your response within 30 days of your receipt of this letter.

Sincerely, original signD by Dennis L.. Zleinann, Chief Operating Reactors Branch 2 Division of Operating Reactors

Enclosure:

Request for Additional Informatizon OFFICENSIC DOR: ORB #2 1DOR: ORB #2 SURNAME

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SEP TOPIC VI-4 REQUEST FOR ADDITIONAL INFORMATION FOR CONTAINMENT PURGE AND VENTING SYSTEM FOR SAN ONOFRE UNIT 1 (DOCKET NO. 50-206)

The docketed information as to the design of the containment purging and venting system includes SCEC letters dated 1/9/79, 12/14/79 and 1/15/80 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 containment 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 qualifications 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 +e 4r.det 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.