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EN Revision Text: MANUAL REACTOR TRIP DURI … EN Revision Text: MANUAL REACTOR TRIP DURING LOW POWER PHYSICS TESTING</br>At 0544 EDT on October 4, 2018, with Unit 1 in Mode 2 with reactor power in the intermediate range performing low power physics testing, the reactor was manually tripped due to a rod control urgent failure alarm. The trip was not complex, with all systems responding normally. Operations stabilized the plant in Mode 3. Decay heat is being removed through the main steam system.</br>Unit 2 was not affected.</br>There was no impact to the health and safety of the public or plant personnel.</br>The NRC Resident Inspectors have been notified.</br>All control rods inserted as expected. The cause of the rod control urgent failure is being investigated.</br>* * * UPDATE FROM KEVIN LOWE TO DONALD NORWOOD AT 1408 EDT ON 10/19/2018 * * *</br>This Event Notification is being updated to clarify that the reactor was not critical when this event occurred. Therefore, the reporting requirement is changed from 10 CFR 50.72(b)(2)(iv)(B) to 10 CFR 50.72 (b)(3)(iv)(A).</br>During Dynamic Rod Worth Measurement testing, Control Bank Charlie was inserted approximately 153 steps when the urgent failure occurred (CBC positioned at 75 steps out). Following the scram, additional analysis concluded that the reactor was subcritical when the Reactor Protection System was actuated." </br>The licensee notified the NRC Resident Inspector.</br>Notified the R2DO (McCoy).dent Inspector.
Notified the R2DO (McCoy). +
04:00:00, 4 October 2018 +
53,643 +
07:57:00, 4 October 2018 +
04:00:00, 4 October 2018 +
EN Revision Text: MANUAL REACTOR TRIP DURI … EN Revision Text: MANUAL REACTOR TRIP DURING LOW POWER PHYSICS TESTING</br>At 0544 EDT on October 4, 2018, with Unit 1 in Mode 2 with reactor power in the intermediate range performing low power physics testing, the reactor was manually tripped due to a rod control urgent failure alarm. The trip was not complex, with all systems responding normally. Operations stabilized the plant in Mode 3. Decay heat is being removed through the main steam system.</br>Unit 2 was not affected.</br>There was no impact to the health and safety of the public or plant personnel.</br>The NRC Resident Inspectors have been notified.</br>All control rods inserted as expected. The cause of the rod control urgent failure is being investigated.</br>* * * UPDATE FROM KEVIN LOWE TO DONALD NORWOOD AT 1408 EDT ON 10/19/2018 * * *</br>This Event Notification is being updated to clarify that the reactor was not critical when this event occurred. Therefore, the reporting requirement is changed from 10 CFR 50.72(b)(2)(iv)(B) to 10 CFR 50.72 (b)(3)(iv)(A).</br>During Dynamic Rod Worth Measurement testing, Control Bank Charlie was inserted approximately 153 steps when the urgent failure occurred (CBC positioned at 75 steps out). Following the scram, additional analysis concluded that the reactor was subcritical when the Reactor Protection System was actuated." </br>The licensee notified the NRC Resident Inspector.</br>Notified the R2DO (McCoy).dent Inspector.
Notified the R2DO (McCoy). +
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00:00:00, 19 October 2018 +
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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