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On June 12, 2001, a Condition Report was g … On June 12, 2001, a Condition Report was generated to document a concern expressed by the NRC Resident Inspector relating to a work activity conducted on May 11, 2001 at Millstone Unit No. 2 (MP2). On May 11, 2001, with the unit operating in Mode 1 at 100% reactor power, welding was performed on the MP2 Turbine Driven Auxiliary Feedwater (BA) Pump (P) (TDAFWP) enclosure door (DR). This door is designated as a High Energy Line Break (HELB) barrier due to the four inch steam supply line feeding the TDAFWP. The nature of the work required the door to be open for approximately 45 minutes. During this time, although operators remained cognizant of the work activity, no compensatory measures were taken to protect equipment credited for safe shutdown in the event of a HELB originating from within the enclosure and no Technical Specification ACTION statements were acknowledged during the work evolution.</br></br>The cause of this event is under investigation and will be reported in a supplement to this report. Corrective actions to date include the revision of existing plant procedures governing work on hazard boundary doors to require entry into applicable Technical Specification ACTION Statements. The safety significance of this event is judged to be low on the basis of the short exposure time and low probability of the initiating event.d low probability of the initiating event. +
June 12, 2001 +
On June 12, 2001, a Condition Report was g … On June 12, 2001, a Condition Report was generated to document a concern expressed by the NRC Resident Inspector relating to a work activity conducted on May 11, 2001 at Millstone Unit No. 2 (MP2). On May 11, 2001, with the unit operating in Mode 1 at 100% reactor power, welding was performed on the MP2 Turbine Driven Auxiliary Feedwater (BA) Pump (P) (TDAFWP) enclosure door (DR). This door is designated as a High Energy Line Break (HELB) barrier due to the four inch steam supply line feeding the TDAFWP. The nature of the work required the door to be open for approximately 45 minutes. During this time, although operators remained cognizant of the work activity, no compensatory measures were taken to protect equipment credited for safe shutdown in the event of a HELB originating from within the enclosure and no Technical Specification ACTION statements were acknowledged during the work evolution.</br></br>The cause of this event is under investigation and will be reported in a supplement to this report. Corrective actions to date include the revision of existing plant procedures governing work on hazard boundary doors to require entry into applicable Technical Specification ACTION Statements. The safety significance of this event is judged to be low on the basis of the short exposure time and low probability of the initiating event.d low probability of the initiating event. +
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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>.
05:13:41, 1 December 2017 +
August 13, 2001 +
June 12, 2001 +
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