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It was reported to EH&S (Environmental … It was reported to EH&S (Environmental Health & Safety) Management that on May 13, 2010 that the XV-202-I valve actuator was showing open when the valve was closed. This valve is the Uranium Hexafluoride (UF6) eduction back-up emergency shut off valve and is credited as a protective feature for a high level condition in the hydrolysis column. This valve is a key component of an Item Relied On for Safety (IROFS) and is identified in the Integrated Safety Analysis (ISA) Summary for the conversion area of the Columbia Fuel Fabrication Facility. This IROFS designation is ADUVAP-110. No process upset occurred and the condition was discovered by the production staff during normal operation.</br>This notification is made based on 10CFR70 Appendix A (b) (2), 'Loss or degradation of items relied on for safety that results in failure to meet the performance requirements of 10CFR70.61.' The performance requirements for this accident sequence require the Overall Likelihood Index (OLI) be a -4, which corresponds to Highly Unlikely. With this control failure the sequence OLI is a -3 which corresponds to Unlikely.</br>Immediate Corrective Actions: </br>- Upon identification of the issue on May 13, production shut down conversion line 2 and generated a 'red book' to inform EH&S.</br>- Maintenance determined the valve actuator had been installed incorrectly.</br>- Maintenance properly installed the actuator on the valve and demonstrated proper performance.</br>- The event has been entered into the Corrective Action Process IR# 10-134-C001.</br>- Conversion line 2 remains shutdown pending staff management authorization for restart.</br>- For all modifications/maintenance activity on IROFS in safety significant systems, staff management approval is required for restart of the system.</br>The licensee believes that the valve mis-position and indication issues occurred during maintenance on the valve approximately one week prior to discovery of the condition.ximately one week prior to discovery of the condition. +
16:33:00, 13 May 2010 +
45,926 +
10:54:00, 14 May 2010 +
16:33:00, 13 May 2010 +
It was reported to EH&S (Environmental … It was reported to EH&S (Environmental Health & Safety) Management that on May 13, 2010 that the XV-202-I valve actuator was showing open when the valve was closed. This valve is the Uranium Hexafluoride (UF6) eduction back-up emergency shut off valve and is credited as a protective feature for a high level condition in the hydrolysis column. This valve is a key component of an Item Relied On for Safety (IROFS) and is identified in the Integrated Safety Analysis (ISA) Summary for the conversion area of the Columbia Fuel Fabrication Facility. This IROFS designation is ADUVAP-110. No process upset occurred and the condition was discovered by the production staff during normal operation.</br>This notification is made based on 10CFR70 Appendix A (b) (2), 'Loss or degradation of items relied on for safety that results in failure to meet the performance requirements of 10CFR70.61.' The performance requirements for this accident sequence require the Overall Likelihood Index (OLI) be a -4, which corresponds to Highly Unlikely. With this control failure the sequence OLI is a -3 which corresponds to Unlikely.</br>Immediate Corrective Actions: </br>- Upon identification of the issue on May 13, production shut down conversion line 2 and generated a 'red book' to inform EH&S.</br>- Maintenance determined the valve actuator had been installed incorrectly.</br>- Maintenance properly installed the actuator on the valve and demonstrated proper performance.</br>- The event has been entered into the Corrective Action Process IR# 10-134-C001.</br>- Conversion line 2 remains shutdown pending staff management authorization for restart.</br>- For all modifications/maintenance activity on IROFS in safety significant systems, staff management approval is required for restart of the system.</br>The licensee believes that the valve mis-position and indication issues occurred during maintenance on the valve approximately one week prior to discovery of the condition.ximately one week prior to discovery of the condition. +
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00:00:00, 14 May 2010 +
SNM-1107 +
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>.
23:23:30, 24 November 2018 +
10:54:00, 14 May 2010 +
0.765 d (18.35 hours, 0.109 weeks, 0.0251 months) +
16:33:00, 13 May 2010 +
a Valve Classified as an Item Relied on for Safety Found Closed While Position Indicator Showed Open +
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