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The following was received via email:
The … The following was received via email:</br>The exhaust plenum monitor (EPM) was sent out for calibration a couple of weeks ago. It was received back on September 17, 2017, and returned to service. (On 9/20/17,) one of the senior reactor operators noticed that the noble gas detector was not responding properly. It was turned off. A relay on the EPM controls reactor bay ventilation, which is required to be operable per Technical Specifications. If the EPM alarms, ventilation is turned off. This relay was rewired to use only the two operating EPM detectors. Despite this, the reactor bay ventilation was observed to not operate as expected. The problem was traced back to a separate faulty relay, which was subsequently bypassed. The senior reactor operator had access to a control room breaker, and planned to manually cut power to the ventilation system if the EPM or continuous air monitor alarmed. An experiment was installed that has the potential to release radioactive gases; the reactor was started up at 1449 CDT and shut down at 1743 CDT. No increases in radiation levels were observed during or after operations. The ventilation system was operating during reactor operations.</br>As previously mentioned, reactor bay ventilation is required to be operable per Technical Specifications. Operable is defined as being capable of performing it's intended function in a normal manner. Manually cutting power to the ventilation system via control room breaker is not considered normal operation for the ventilation system. According to Technical Specifications, the reactor may be operated with the ventilation system inoperable, but reactor experiment operations with the potential to release radioactive gases or aerosols must be secured. While the apparatus was secured according to the definition in Section 1 of the Technical Specifications, the experiment was still performed, and so experiment operations were not secured in accordance with the Limiting Condition of Operation. with the Limiting Condition of Operation. +
19:49:00, 19 September 2017 +
52,980 +
13:13:00, 20 September 2017 +
19:49:00, 19 September 2017 +
The following was received via email:
The … The following was received via email:</br>The exhaust plenum monitor (EPM) was sent out for calibration a couple of weeks ago. It was received back on September 17, 2017, and returned to service. (On 9/20/17,) one of the senior reactor operators noticed that the noble gas detector was not responding properly. It was turned off. A relay on the EPM controls reactor bay ventilation, which is required to be operable per Technical Specifications. If the EPM alarms, ventilation is turned off. This relay was rewired to use only the two operating EPM detectors. Despite this, the reactor bay ventilation was observed to not operate as expected. The problem was traced back to a separate faulty relay, which was subsequently bypassed. The senior reactor operator had access to a control room breaker, and planned to manually cut power to the ventilation system if the EPM or continuous air monitor alarmed. An experiment was installed that has the potential to release radioactive gases; the reactor was started up at 1449 CDT and shut down at 1743 CDT. No increases in radiation levels were observed during or after operations. The ventilation system was operating during reactor operations.</br>As previously mentioned, reactor bay ventilation is required to be operable per Technical Specifications. Operable is defined as being capable of performing it's intended function in a normal manner. Manually cutting power to the ventilation system via control room breaker is not considered normal operation for the ventilation system. According to Technical Specifications, the reactor may be operated with the ventilation system inoperable, but reactor experiment operations with the potential to release radioactive gases or aerosols must be secured. While the apparatus was secured according to the definition in Section 1 of the Technical Specifications, the experiment was still performed, and so experiment operations were not secured in accordance with the Limiting Condition of Operation. with the Limiting Condition of Operation.
Has query"Has query" is a predefined property that represents meta information (in form of a <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Subobject">subobject</a>) about individual queries and is provided by <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Help:Special_properties">Semantic MediaWiki</a>.
00:00:00, 20 September 2017 +
R-88 +
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>.
00:32:29, 1 October 2017 +
13:13:00, 20 September 2017 +
0.725 d (17.4 hours, 0.104 weeks, 0.0238 months) +
19:49:00, 19 September 2017 +
URL"URL" is a <a href="/Special:Types/URL" title="Special:Types/URL">type</a> and predefined property provided by <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Help:Special_properties">Semantic MediaWiki</a> to represent URI/URL values.