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This notification is being made in accorda … This notification is being made in accordance with 10 CFR 50.73 (a)(2)(iv)(A) to provide information pertaining to an invalid Primary Containment Isolation System (PCIS) Group 3 actuation signal that affected containment valves in more than one system.</br>On 12/15/2013, with the reactor at 100% power, invalid PCIS Group 3 actuation occurred from a momentary spike of the 'B' Refuel Floor radiation monitor which reached the instrument's high radiation trip set point. A radiation protection technician was dispatched to the refuel floor and dose rates in the vicinity of the 'B' radiation monitor detector were verified to be normal and below the alarm set points. The radiation monitor was verified to be indicating normal expected radiation levels. The detector and trip unit were replaced, a functional check and calibration of the radiation monitor was completed satisfactory and the instrument channel was returned to service. The issue has been entered into the station's corrective action program.</br>Both trains of Standby Gas Treatment System started as designed and Reactor Building ventilation isolated as a result of the invalid PCIS actuation.</br>The PCIS functioned successfully providing a complete Group 3 isolation. The PCIS Group 3 isolation involves the following systems:</br>Drywell and Suppression Chamber Air and Vent: V16-19-6, 6A, 6B, 7, 7A, 7B, 8, 9, 10, 23</br>Containment Makeup: V-16-20-20, 22A, 22B</br>Containment Air Sampling: VG-23, 26, V109-76A, 76B</br>Containment Air Compressor Suction: V72-38A, 38B</br>Containment Air Dilution: VG-9A, 9B, 22A, 22B, NG-11A, 11B, 12A, 12B, 13A, 13B</br>Since no actual high radiation condition existed which required the PCIS Group 3 isolation, and the actuation was not in response to actual plant conditions satisfying the requirements for isolation, this event has been classified as an invalid actuation.</br>This event did not result in any adverse impact to the health and safety of the public.</br>In accordance with 10 CFR 50.73(a)(1) a telephone notification is being made instead of submitting a written Licensee Event Report. The licensee has notified the NRC Resident Inspector.e has notified the NRC Resident Inspector.
05:00:00, 15 December 2013 +
49,825 +
10:16:00, 13 February 2014 +
05:00:00, 15 December 2013 +
This notification is being made in accorda … This notification is being made in accordance with 10 CFR 50.73 (a)(2)(iv)(A) to provide information pertaining to an invalid Primary Containment Isolation System (PCIS) Group 3 actuation signal that affected containment valves in more than one system.</br>On 12/15/2013, with the reactor at 100% power, invalid PCIS Group 3 actuation occurred from a momentary spike of the 'B' Refuel Floor radiation monitor which reached the instrument's high radiation trip set point. A radiation protection technician was dispatched to the refuel floor and dose rates in the vicinity of the 'B' radiation monitor detector were verified to be normal and below the alarm set points. The radiation monitor was verified to be indicating normal expected radiation levels. The detector and trip unit were replaced, a functional check and calibration of the radiation monitor was completed satisfactory and the instrument channel was returned to service. The issue has been entered into the station's corrective action program.</br>Both trains of Standby Gas Treatment System started as designed and Reactor Building ventilation isolated as a result of the invalid PCIS actuation.</br>The PCIS functioned successfully providing a complete Group 3 isolation. The PCIS Group 3 isolation involves the following systems:</br>Drywell and Suppression Chamber Air and Vent: V16-19-6, 6A, 6B, 7, 7A, 7B, 8, 9, 10, 23</br>Containment Makeup: V-16-20-20, 22A, 22B</br>Containment Air Sampling: VG-23, 26, V109-76A, 76B</br>Containment Air Compressor Suction: V72-38A, 38B</br>Containment Air Dilution: VG-9A, 9B, 22A, 22B, NG-11A, 11B, 12A, 12B, 13A, 13B</br>Since no actual high radiation condition existed which required the PCIS Group 3 isolation, and the actuation was not in response to actual plant conditions satisfying the requirements for isolation, this event has been classified as an invalid actuation.</br>This event did not result in any adverse impact to the health and safety of the public.</br>In accordance with 10 CFR 50.73(a)(1) a telephone notification is being made instead of submitting a written Licensee Event Report. The licensee has notified the NRC Resident Inspector.e has notified the NRC Resident Inspector.
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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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10:16:00, 13 February 2014 +
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60.22 d (1,445.27 hours, 8.603 weeks, 1.98 months) +
05:00:00, 15 December 2013 +
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