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(The licensee declared an Unusual Event at … (The licensee declared an Unusual Event at 1607 PDT due to a) small hydrogen burn when opening the stator cooling water system for maintenance. There were no injuries or equipment damage.</br>The licensee entered EAL 93U3 'Toxic Gases inside the Protected Area Boundary.'</br>The licensee notified state/local agencies and will inform the NRC Resident Inspector. The licensee plans to issue a press release.</br>* * * UPDATE FROM MATT HUMMER TO DONG PARK AT 0003 EDT ON 04/08/11 * * *</br>(At 2053 PDT,) Columbia has terminated the Unusual Event declared at 1607 (PDT) on 04/07/11. Conditions throughout the plant have remained stable. Columbia has confirmed there is no hazard to personnel safety nor a challenge to safe plant operation.</br>The licensee will notify the NRC Resident Inspector.</br>Notified R4DO (OKeefe), NRR EO (Blount), IRD (Grant), DHS (Jenkins), and FEMA (O'Connell).</br>* * * UPDATE FROM MATT HUMMER TO JOE O'HARA AT 2318 ON 4/8/11 * * * </br>At 1922 EDT on April 7, 2011, NRC was notified of an Unusual Event at Columbia Generating Station (EN#46739), The NRC was notified the event was terminated at 2353 EDT on April 7, 2011. </br>Based on further investigation, this event is being retracted.</br>The stator cooling water system contains a mixture of water and hydrogen when in operation. The system had been removed from service, drained and blanketed with nitrogen prior to commencing maintenance. There was no active source of hydrogen in the system. Although the system had been tested for hydrogen and none was detected, the event occurred when workers cut into a section of the system piping where a small amount of residual hydrogen remained.</br>Immediately following the event, tape was placed over the cut to prevent any debris from entering the pipe. Hydrogen measurements were taken in the vicinity of the cut section of pipe and in the general area and concentrations were below hazardous levels. The only elevated reading occurred directly at the cut location when the tape was removed, This indicated that hydrogen, residual in nature, was confined to the inside of the pipe. Since the system was not in use and the residual hydrogen was confined, plant operations were not affected,</br>As a result of this event, no personnel were injured, no equipment was damaged, and there was no impact to structures needed for plant operation.</br>The licensee will notify the NRC Resident Inspector, the media, and local, state, and other government agencies of this update.</br>Notified R4DO(O'Keefe)ies of this update.
Notified R4DO(O'Keefe)
23:07:00, 7 April 2011 +
46,739 +
19:22:00, 7 April 2011 +
23:07:00, 7 April 2011 +
(The licensee declared an Unusual Event at … (The licensee declared an Unusual Event at 1607 PDT due to a) small hydrogen burn when opening the stator cooling water system for maintenance. There were no injuries or equipment damage.</br>The licensee entered EAL 93U3 'Toxic Gases inside the Protected Area Boundary.'</br>The licensee notified state/local agencies and will inform the NRC Resident Inspector. The licensee plans to issue a press release.</br>* * * UPDATE FROM MATT HUMMER TO DONG PARK AT 0003 EDT ON 04/08/11 * * *</br>(At 2053 PDT,) Columbia has terminated the Unusual Event declared at 1607 (PDT) on 04/07/11. Conditions throughout the plant have remained stable. Columbia has confirmed there is no hazard to personnel safety nor a challenge to safe plant operation.</br>The licensee will notify the NRC Resident Inspector.</br>Notified R4DO (OKeefe), NRR EO (Blount), IRD (Grant), DHS (Jenkins), and FEMA (O'Connell).</br>* * * UPDATE FROM MATT HUMMER TO JOE O'HARA AT 2318 ON 4/8/11 * * * </br>At 1922 EDT on April 7, 2011, NRC was notified of an Unusual Event at Columbia Generating Station (EN#46739), The NRC was notified the event was terminated at 2353 EDT on April 7, 2011. </br>Based on further investigation, this event is being retracted.</br>The stator cooling water system contains a mixture of water and hydrogen when in operation. The system had been removed from service, drained and blanketed with nitrogen prior to commencing maintenance. There was no active source of hydrogen in the system. Although the system had been tested for hydrogen and none was detected, the event occurred when workers cut into a section of the system piping where a small amount of residual hydrogen remained.</br>Immediately following the event, tape was placed over the cut to prevent any debris from entering the pipe. Hydrogen measurements were taken in the vicinity of the cut section of pipe and in the general area and concentrations were below hazardous levels. The only elevated reading occurred directly at the cut location when the tape was removed, This indicated that hydrogen, residual in nature, was confined to the inside of the pipe. Since the system was not in use and the residual hydrogen was confined, plant operations were not affected,</br>As a result of this event, no personnel were injured, no equipment was damaged, and there was no impact to structures needed for plant operation.</br>The licensee will notify the NRC Resident Inspector, the media, and local, state, and other government agencies of this update.</br>Notified R4DO(O'Keefe)ies of this update.
Notified R4DO(O'Keefe)
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00:00:00, 8 April 2011 +
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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