ENS 40396
ENS Event | |
|---|---|
11:15 Dec 17, 2003 | |
| Title | Technical Specification Required Shutdown Due To Loss Of Both Trains Of Safety Injection |
| Event Description | The following information was obtained from the licensee via facsimile:
1. SYSTEMS AFFECTED: High Pressure Safety Injection (HPSI), Low Pressure Safety Injection (LPSI), Recirculation Actuation [System] (RAS), Containment Spray (CS). 2. ACTUATIONS AND THEIR INITIATING SIGNALS: None 3. CAUSES: 400 [volt] Motor Control Center (MCC) 3BE deenergized due to an overcurrent condition on the 'A' train 1E bus. 'B' train equipment is cleared for maintenance causing Technical Specification 3.0.3 entry. 4. EFFECT OF EVENT ON PLANT: Both trains of Safety Injection equipment inoperable with no flow capability requiring plant shutdown. 5. ACTIONS TAKEN OR PLANNED: Shutdown commenced at 0410 [PST]. MCC 3BE is stripped and loads will be checked for faults while attempting to restore the bus. Train 'B' equipment will be restored as soon as possible. Continuation Sheet: Power/Mode will be reduced per T.S. 3.0.3 action until MCC 3BE loads restored or Tr[ain] 'B' equipment returned to service. [Plant required to be in] Mode 3 [within] 7 hrs, Mode 4 [within] 13 hrs. [and] Mode 5 [within] 37 hrs. No abnormal electrical lineups. No effect on Unit 2. LPSI pump/valves will need to be restored to allow Mode 5 entry. Plant personnel suspect a problem with the 1E bus feeder breaker. A new breaker will be installed after testing is completed. Bus loads are in the process of being checked for problems. At the time of the initial call, plant power was at 80% and decreasing at approximately 10% per hour. At 0939 PST, plant power was at 71% and decreasing. The 1E bus have been meggered with no problems found. Battery chargers are currently not operating due to loss of the buses but not expected to be a problem since DC loads are very low during mode 1 operations. The licensee has notified the NRC Resident Inspector. |
| Where | |
|---|---|
San Onofre  California (NRC Region 4) | |
| Reporting | |
| 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown | |
| Time - Person (Reporting Time:+-2.67 h-0.111 days <br />-0.0159 weeks <br />-0.00366 months <br />) | |
| Opened: | John Braisted 08:35 Dec 17, 2003 |
| NRC Officer: | Howie Crouch |
| Last Updated: | Dec 17, 2003 |
| 40396 - NRC Website
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Unit 3 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (80 %) |
WEEKMONTHYEARENS 455642009-12-12T09:26:00012 December 2009 09:26:00
[Table view]10 CFR 50.72(b)(3)(v)(A), Loss of Safety Function - Shutdown the Reactor, 10 CFR 50.72(a)(1)(i), Emergency Class Declaration, 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Unusual Event Declared Due to Both Emergency Diesel Generators Being Inoperable ENS 444562008-09-01T17:35:0001 September 2008 17:35:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Shutdown Due to Emergency Diesel Generator Shorting Ring Cracks ENS 440922008-03-25T15:40:00025 March 2008 15:40:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Plant Shutdown Initiated Due to Degraded Battery Voltage ENS 424512006-03-29T08:01:00029 March 2006 08:01:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Unit 3 Shutdown Due to Potential Safety Injection Tank Gasket Issue ENS 414102005-02-15T05:55:00015 February 2005 05:55:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Tech Spec Required Shutdown ENS 403962003-12-17T11:15:00017 December 2003 11:15:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Technical Specification Required Shutdown Due to Loss of Both Trains of Safety Injection 2009-12-12T09:26:00 | |