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At 1758 (PDT) on June 27, 2013, an alarm s … 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.</br>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.</br>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.</br>The licensee notified the NRC Resident Inspector.ensee notified the NRC Resident Inspector. +
00:58:00, 28 June 2013 +
49,152 +
04:07:00, 28 June 2013 +
00:58:00, 28 June 2013 +
At 1758 (PDT) on June 27, 2013, an alarm s … 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.</br>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.</br>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.</br>The licensee notified the NRC Resident Inspector.ensee notified the NRC Resident Inspector. +
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65 +
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Modification date"Modification date" is a predefined property that corresponds to the date of the last modification of a subject and is provided by <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Help:Special_properties">Semantic MediaWiki</a>.
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00:58:00, 28 June 2013 +
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