Browse wiki
Jump to navigation
Jump to search
On March 13, 2015, at 0919 hours, Secondar … On March 13, 2015, at 0919 hours, Secondary Containment became inoperable requiring a Technical Specification (TS) 3.6.4.1, Condition A, entry for failure to meet Surveillance Requirement 3.6.4.1.1 for Susquehanna Steam Electric Station (SSES) Unit 1 and Unit 2. The Reactor Building (RB) Zone 2 differential pressure fell below the TS limit of 0.25 inches water column (wc) vacuum, when an air handling plenum door was open for approximately one minute. The LCO was exited at 0930 hours when the differential pressure returned to 0.34 inches wc vacuum. On March 13, 2015, at 1256 hours, this condition was determined to be reportable as an 8 hour ENS (#50885) in accordance with 10 CFR 50.72(b)(3)(v)(C) for any event or condition that could have prevented the fulfillment of the safety function of structures or systems that are needed to control the release of radioactive material. SSES has no redundant Secondary Containment system.</br></br>The direct cause of the event was due to plant personnel holding the RB plenum door open for approximately one minute while performing radiation surveys.</br></br>Key Completed Actions: 1) Signs were added to the affected Unit 1 and Unit 2 exhaust fan plenum doors warning of the Secondary Containment implications, and 2) Plant personnel were coached regarding the use of the RB plenum doors.</br></br>Key Planned Action: Install signs on all major Reactor Building fan plenum doors to alert plant personnel of the Secondary Containment impacts.</br></br>There were no actual consequences to the health and safety of the public as a result of this event. An Engineering evaluation concluded that Secondary Containment could have performed its safety function of isolating as assumed in the SSES accident analysis and also of re-establishing 0.25 inches wc vacuum (i.e., drawdown time) within the assumed accident analysis time of 10 minutes.umed accident analysis time of 10 minutes. +
On March 13, 2015, at 0919 hours, Secondar … On March 13, 2015, at 0919 hours, Secondary Containment became inoperable requiring a Technical Specification (TS) 3.6.4.1, Condition A, entry for failure to meet Surveillance Requirement 3.6.4.1.1 for Susquehanna Steam Electric Station (SSES) Unit 1 and Unit 2. The Reactor Building (RB) Zone 2 differential pressure fell below the TS limit of 0.25 inches water column (wc) vacuum, when an air handling plenum door was open for approximately one minute. The LCO was exited at 0930 hours when the differential pressure returned to 0.34 inches wc vacuum. On March 13, 2015, at 1256 hours, this condition was determined to be reportable as an 8 hour ENS (#50885) in accordance with 10 CFR 50.72(b)(3)(v)(C) for any event or condition that could have prevented the fulfillment of the safety function of structures or systems that are needed to control the release of radioactive material. SSES has no redundant Secondary Containment system.</br></br>The direct cause of the event was due to plant personnel holding the RB plenum door open for approximately one minute while performing radiation surveys.</br></br>Key Completed Actions: 1) Signs were added to the affected Unit 1 and Unit 2 exhaust fan plenum doors warning of the Secondary Containment implications, and 2) Plant personnel were coached regarding the use of the RB plenum doors.</br></br>Key Planned Action: Install signs on all major Reactor Building fan plenum doors to alert plant personnel of the Secondary Containment impacts.</br></br>There were no actual consequences to the health and safety of the public as a result of this event. An Engineering evaluation concluded that Secondary Containment could have performed its safety function of isolating as assumed in the SSES accident analysis and also of re-establishing 0.25 inches wc vacuum (i.e., drawdown time) within the assumed accident analysis time of 10 minutes.umed accident analysis time of 10 minutes. +
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>.
2 +
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>.
04:54:01, 1 December 2017 +
Secondary Containment Inoperability Due To Failure to Meet Technical Specification Surveillance Requirement 3.6.4.1.1 +
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.