ML13310B398

Requests Addl Info Re Environ Qualification of Equipment Important to Safety,Including All Applicable Justifications for Continued Operation.Response Requested by 840615

ML13310B398
Person / Time
Site:	San Onofre
Issue date:	05/09/1984
From:	Crutchfield D Office of Nuclear Reactor Regulation
To:	Baskin K SOUTHERN CALIFORNIA EDISON CO.
References
LSO5-84-05-011, LSO5-84-5-11, TAC-42516, NUDOCS 8405110015
Download: ML13310B398 (4)

Text

~R P~REG UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555 May 9, 1984 Docket No. 50-206 LSO5-84-05-011 Mr. Kenneth P. Baskin, Vice President Nuclear Engineering Licensing and Safety Department Southern California Edison Company 2244 Walnut Grove Avenue Post Office Box 800 Rosemead, California 91770

SUBJECT:

ENVIRONMENTAL QUALIFICATION OF EQUIPMENT IMPORTANT TO SAFETY, REQUEST FOR ADDITIONAL INFORMATION - SAN ONOFRE NUCLEAR GENERATING STATION, UNIT NO. 1 The staff has completed its review of the environmental qualification of electrical equipment important to safety for San Onofre. The review identified the need to docket all outstanding justifications for continued operation (JCO's) and the additional information listed below. In order to complete the Safety Evaluation Report on enviromental qualification for San Onofre, the following information is required by June 15, 1984:

1. Submit all applicable JCO's that are currently being relied upon and certify the following for each JCOG'as-sociated with equipment that is assumed to fail:

No significant degradation of any safety function or misleading information to the operator as a result of failure of equipment under the accident environment resulting from a design basis event will occur.

2. The licensee should certify that in performing its review of the methodology to identify equipment within the scope of 10 CFR 50.49(b)(2) that the following steps have been addressed:

a. A list was generated of safety-related electric equipment as defined in paragraph (b)(1) of 10 CFR 50.49 required to remain functional during or following design-basis Loss-of-Coolant Accident (LOCA) or High Energy Line Break (HELB) Accidents.

The LOCA/HELB accidents are the only design-basis accidents which result in significantly adverse environments to electrical equipment which is required for safe shutdown or accident mitigation. The list was based on reviews of the Final Safety Analysis Report (FSAR), Technical Specifications, Emergency Operating Procedures, Piping and Instrumentation Diagrams (P&IDs), and electrical distribution diagrams; 8~

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Mr. Kenneth May 9, 1984

b. The elementary wiring diagrams of the safety-related electrical equipment identified in Step a were reviewed to identify any auxiliary devices electrically connected directly into the control or power circuitry of the safety-related equipment (e.g.,-automatic trips) whose failure due to postulated enviromental conditions could prevent required operation of the -safety-related equipment;

c. The operation of the safety-related systems and equipment were reviewed to identify any directly mechanically connected auxiliary systems with electrical components which are necessary for the required operation of the safety-related equipment (e.g., cooling water or lubricating systems).

This involved the review of P&IDs, component technical manuals, and/or systems descriptions in the FSAR; and

d. Nonsafety-related electrical circuits indirectly associated with the electrical equipment identified in Step a by common power supply or physical proximity were considered by a review of the electrical design including the use of applicable industry standards (e.g., IEEE, NEMA, ANSI, UL, and NEC) and the use of properly coordinated protective relays, circuit breakers, and fuses for electrical fault protection.

3. Provide certification that all design basis events which could potentially result in a harsh environment, including flooding outside containment, were addressed in identifying safety-related electrical equipment within the scope of 10 CFR 50.49(b)(1).

This request for information was approved by OMB under clearance number 3150-0065. Comments on burden and duplication may be directed to the Office of Management and Budget, Reports and Management, Room 3208, New Executive Office Building, Washington, D. C.

Dennis M. Crutchfield, Chief SOperating Reactors Branch #5 Division of Licensing cc: See next page

Mr. Kenneth May 9, 1984

b. The elementary wiring diagrams of the safety-related electrical equipment identified in Step 1 were reviewed to identify any auxiliary devices electrically connected directly into the control or power circuitry of the safety-related equipment (e.g., automatic trips) whose failure due to postulated enviromental conditions could prevent required operation of the safety-related equipment;

c. The operation of the safety-related systems and equipment were reviewed to identify any directly mechanically connected auxiliary systems with electrical components which are necessary for the required operation of the safety-related equipment (e.g., cooling water or lubricating systems).

This involved the review of P&IDs, component technical manuals, and/or systems descriptions in the FSAR; and

d. Nonsafety-related electrical circuits indirectly associated with the electrical equipment identified in Step 1 by common power supply or physical proximity were considered by a review of the electrical design including the use of applicable industry standards (e.g., IEEE, NEMA, ANSI, UL, and NEC) and the use of properly coordinated protective relays, circuit breakers, and fuses for electrical fault protection.

3. Provide certification that all design basis events which could potentially result in a harsh environment, including flooding outside containment, were addressed in identifying safety-related electrical equipment within the scope of 10 CFR 50.49(b)(1).

This request for information was approved by OMB under clearance number 3150-0065. Comments on burden and duplication may be directed to the Office of Management and Budget, Reports and Management, Room 3208, New Executive Office Building, Washington, D. C.

Original signed by Thomas Wambach for Dennis M. Crutchfield, Chief Operating Reactors Branch #5 Division of Licensing cc: See next page CD &ket:FI2 NRC PDR ACRS (10)

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Mr. Kenneth P. Baskin cc Charles R. Kocher, Assistant General Counsel James Beoletto, Esquire Southern California Edison--Company Post Office Box 800 Rosemead, California 91770 David R. Pigott Orrick, Herrington & Sutcliffe 600 Montogmery Street San Francisco, California 94111 Dr. Lou Bernath San Diego Gas & Electric Company P. 0. Box 1831 San Diego, California 92112 Resident Inspector/San Onofre NPS c/o U.S. NRC P. 0. Box 4329 San Clemente, California 92672 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:

Joseph 0. Ward, Chief Radiation Control Unit Radiological Health Section 714 P Street, Room 498 Sacramento, California 95814 U.S. Environmental Protection Agency Region IX Office ATTN:

Regional Radiation Representative 215 Freemont Street San Francisco, California 94105 John B. Martin, Regional Administrator Nuclear Regulatory Commission, Region V 1450 Maria Lane Walnut Creek, California 94596