ENS Event | |
|---|---|
02:55 Aug 19, 2007 | |
| Title | Emergency Diesel Generator Work Platforms Not Properly Restrained |
| Event Description | On August 18, 2007, at about 1955 PDT, both of SONGS Unit 3 Emergency Diesel Generators (EDG) were found in a condition that was not seismically analyzed. At about 2015 PDT on August 18, 2007, both of SONGS Unit 2 EDGs were found to be in the same unanalyzed condition. The condition involved EDG maintenance work platforms that had not been properly restrained, and, in the position found, could potentially render the EDGs inoperable during a seismic event.
SCE is reporting this occurrence as a potential loss of safety function in accordance with 10CFR50.72(b)(3)(v). SCE took immediate actions to properly restrain the EDG work platforms, and an evaluation will be conducted to determine the cause of this event. At the time of this occurrence, Unit 2 was operating at about 99% power and Unit 3 was operating at about 100% power. SCE has notified the NRC Senior Resident Inspector about this occurrence and will provide them with a copy of this report.
The licensee is retracting this report based on the following: On August 18, 2007, SCE reported that Emergency Diesel Generator (EDG) work platforms on both Units 2 and 3 had not been properly restrained. This resulted in a condition unanalyzed for seismic events. Consequently, both trains of EDGs on both Units 2 and 3 were declared inoperable. SCE evaluated configuration of the platforms for vulnerabilities to a design bases event. SCE concluded that the DGs were operable as-found. Consequently, SCE is retracting the phone report to the NRC (Event Log No. 43579)." The licensee will inform the NRC Resident Inspector. Notified R4DO (Jones). |
| Where | |
|---|---|
San Onofre  California (NRC Region 4) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(v)(A), Loss of Safety Function - Shutdown the Reactor | |
| Time - Person (Reporting Time:+-0.53 h-0.0221 days <br />-0.00315 weeks <br />-7.25994e-4 months <br />) | |
| Opened: | Michael Mcbrearty 02:23 Aug 19, 2007 |
| NRC Officer: | John Mackinnon |
| Last Updated: | Sep 14, 2007 |
| 43579 - NRC Website
Loading map... | |
Unit 2 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (99 %) |
| After | Power Operation (99 %) |
Unit 3 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
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 435792007-08-19T02:55:00019 August 2007 02:55:00 10 CFR 50.72(b)(3)(v)(A), Loss of Safety Function - Shutdown the Reactor Emergency Diesel Generator Work Platforms Not Properly Restrained 2009-12-12T09:26:00 | |