ENS 49152
ENS Event | |
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00:58 Jun 28, 2013 | |
Title | High Pressure Core Spray and Division 3 Diesel Generator Inoperable for 20 Minutes |
Event Description | At 1758 [PDT] on June 27, 2013, an alarm signaling heating, ventilation and air conditioning (HVAC) trouble in the Division 3 diesel and high pressure core spray (HPCS) room was received in the main control room. Follow-up investigation determined that the switch for the normal room supply fan (DMA-FN-32) was off. It is believed that the switch may have been inadvertently mispositioned during ongoing work in the vicinity. A worker was moving a vacuum nearby and stopped when he heard the local alarm. Columbia Generating Station is performing further investigation to determine if there are other possibilities for DMA-FN-32 control switch being mispositioned.
The fan was returned to service at 1819 [PDT]. An Operation's supervisor was present when returning the switch to ON and verified the switch operated as expected. Loss of DMA-FN-32 results in both the HPCS diesel (DG-3) and the HPCS system being inoperable due to inadequate cooling of those systems. Offsite power for Division 3 was verified to be operable while DG-3 was inoperable. The loss of the HPCS system results in the loss of safety function for a single train system and thus is reportable under the 10 CFR 50.72 sections noted above. Appropriate Technical Specification actions were entered and exited for DG-3 and HPCS inoperability times. There was no radiological release associated with this event. No safety system actuations or isolations occurred. The licensee notified the NRC Resident Inspector. |
Where | |
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Columbia Generating Station ![]() Washington (NRC Region 4) | |
Reporting | |
10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |
LER: | 05000397/LER-2013-006 |
Time - Person (Reporting Time:+3.15 h0.131 days <br />0.0187 weeks <br />0.00431 months <br />) | |
Opened: | Rick Kerrone 04:07 Jun 28, 2013 |
NRC Officer: | Mark Abramovitz |
Last Updated: | Jun 28, 2013 |
49152 - NRC Website
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Unit 2 | |
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Reactor critical | Critical |
Scram | No |
Before | Power Operation (65 %) |
After | Power Operation (65 %) |