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At 1622 (CST) on November 16, 2011, NextEr … At 1622 (CST) on November 16, 2011, NextEra Energy Duane Arnold declared the 'A' River Water Supply inoperable following discovery that the HVAC damper controller was installed in reverse. This would have closed the HVAC intake dampers on high temperature instead of opening them. At this time, the 'B' River Water Supply system was already inoperable for HVAC damper maintenance. This resulted in entering TS 3.7.2 Condition B for both River Water Supply systems inoperable (required action to restore a train or be shutdown in 12 hours). Both trains of River Water Supply inoperability potentially affect the plant capability to remove residual heat. Therefore, this event is being reported pursuant to the requirements of 10CFR 50.72(b)(3)(v)(B).</br>At 1735 (CST) on November 16, 2011 Post Maintenance testing on the 'B' River Water Supply HVAC Dampers was completed and 'B' River Water Supply was declared operable, restoring the capability to remove residual heat.</br>The NRC Resident Inspector has been notified.</br>* * * UPDATE AT 1440 EST ON 01/16/12 FROM BOB MURRELL TO S. SANDIN * * *</br>The licensee is retracting this report based on the following:</br>The purpose of this notification is to retract a previous report made on 11/16/2011 at 19:04 (ET) (EN 47448). Notification of the event to the NRC was initially made as a result of declaring both trains of the River Water Supply (RWS) system inoperable following the discovery that the HVAC damper controller was installed incorrectly. </br>Subsequent to the initial report, NextEra Energy Duane Arnold (NextEra) has determined that the RWS system was capable of performing its safety function and was fully operable during the period that the HVAC controller was incorrectly configured. Specifically, based on the environmental conditions that existed during the period from November 8, 2011 to November 16, 2011, the non-TS RWS Intake HVAC system was Functional, but Degraded.</br>This event is not considered a Safety System Functional Failure or a Condition Prohibited by TS and is not reportable to the NRC as a Licensee Event Report (LER) per 10 CFR 50.73.</br>The NRC Senior Resident Inspector has been notified.</br>Notified R3DO (Orth).r has been notified.
Notified R3DO (Orth).
22:22:00, 16 November 2011 +
47,448 +
19:04:00, 16 November 2011 +
22:22:00, 16 November 2011 +
At 1622 (CST) on November 16, 2011, NextEr … At 1622 (CST) on November 16, 2011, NextEra Energy Duane Arnold declared the 'A' River Water Supply inoperable following discovery that the HVAC damper controller was installed in reverse. This would have closed the HVAC intake dampers on high temperature instead of opening them. At this time, the 'B' River Water Supply system was already inoperable for HVAC damper maintenance. This resulted in entering TS 3.7.2 Condition B for both River Water Supply systems inoperable (required action to restore a train or be shutdown in 12 hours). Both trains of River Water Supply inoperability potentially affect the plant capability to remove residual heat. Therefore, this event is being reported pursuant to the requirements of 10CFR 50.72(b)(3)(v)(B).</br>At 1735 (CST) on November 16, 2011 Post Maintenance testing on the 'B' River Water Supply HVAC Dampers was completed and 'B' River Water Supply was declared operable, restoring the capability to remove residual heat.</br>The NRC Resident Inspector has been notified.</br>* * * UPDATE AT 1440 EST ON 01/16/12 FROM BOB MURRELL TO S. SANDIN * * *</br>The licensee is retracting this report based on the following:</br>The purpose of this notification is to retract a previous report made on 11/16/2011 at 19:04 (ET) (EN 47448). Notification of the event to the NRC was initially made as a result of declaring both trains of the River Water Supply (RWS) system inoperable following the discovery that the HVAC damper controller was installed incorrectly. </br>Subsequent to the initial report, NextEra Energy Duane Arnold (NextEra) has determined that the RWS system was capable of performing its safety function and was fully operable during the period that the HVAC controller was incorrectly configured. Specifically, based on the environmental conditions that existed during the period from November 8, 2011 to November 16, 2011, the non-TS RWS Intake HVAC system was Functional, but Degraded.</br>This event is not considered a Safety System Functional Failure or a Condition Prohibited by TS and is not reportable to the NRC as a Licensee Event Report (LER) per 10 CFR 50.73.</br>The NRC Senior Resident Inspector has been notified.</br>Notified R3DO (Orth).r has been notified.
Notified R3DO (Orth).
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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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