ML20057B851
| ML20057B851 | |
| Person / Time | |
|---|---|
| Site: | LaSalle  |
| Issue date: | 09/16/1993 |
| From: | Martin J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Wallace M COMMONWEALTH EDISON CO. |
| References | |
| CAL-RIII-93-14, NUDOCS 9309240066 | |
| Download: ML20057B851 (2) | |
Text
{{#Wiki_filter:, s SEP 161993 CONFIRMATORY ACTION LETTER Docket No. 50-373 CAL-RIII-93-014 Commonwealth Edison Company ATTN: Mr. Michael J. Wallace Vice President Chief Nuclear Officer Executive Towers West III, Suite 500 1400 Opus Place Downers Grove, Illinois 60515
Dear Mr. Wallace:
This confirms the conversation on September 16, 1993, between Mr. Geoffrey Wright of my staff and Mr. Warren Murphy of your staff related to the loss of off-site power (LOOP) event at LaSalle Unit I which occurred on September 14, 1993. With respect to the LaSalle Unit 1 matters discussed, we understand that you will perform the following actions: 1. Conduct an investigation to determine: a. The root cause of the LOOP event and the loss of the IB RPS MG set. b. The adequacy of E0Ps and Abnormal Procedures to handle this event. ] c. The security system's power supply performance during the event. d. The adequacy of the 10CFR50.54(x) reportability determination. e. The reasons for identified equipment and indication failures including the safety relief valves, the failure of one IRM to insert, the failure of the recirculation pump suction valve to close j on the first attempt, and the problems associated with the RCIC and LPCS check valve position indication. f. The sequence of events and adequacy of operator actions. 2. Maintain documentary evidence of your investigation effort and make this available to the Augmented Inspection Team (AIT). i 9309240066 930916 PDR ADOCK 05000373 S PDR;
3 s SEP 161993 i Commonwealth Edison Company 2 CAL-RIII-93-014 3. Provide within 30 days to NRC Region III a documented evaluation of the above issues including corrective actions you have taken or plan to take. We further understand that reactor startup (power operation) will not occur until you have informed the Regicnal Administrator or his designee of the results of your investigation and corrective actions. None of the actions specified herein should be construed to take precedence over actions which you feel necessary to ensure plant and personnel safety. If your understanding differs from that set forth above, please call me immediately. Issuance of this Confirmatory Action Letter does not preclude issuance of an Order formalizing the above commitments or requiring other actions on the part of Commonwealth Edison Company. Nor does it preclude NRC from taking enforcement action for violations of NRC requirements that may have prompted the issuance of this letter. i Sincerely, CM.lUEIU d Sy. 5cgy-{[g g ~ John B. Martin Regional Administrator See Attached Distribution 1 h04I f Ltd)e. 36 3of [# M-gr Rgl,M R } RIII RIII RIII h %W <j x acc - g ue C1ayton nski PfIrriey Greenman A efayette y ag/(/93 09//6/93 09//f /93 09%/93 09/ b/93 09 # /93 09/, f VIA e-M n n j 09//p/93 /p/93 09//4 /9 BY 6C M iwfrhyt-v')A C-rtiet o L ,-}}