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At 1400 (CDT) on September 9, 2013, plant … At 1400 (CDT) on September 9, 2013, plant personnel found HELB barrier HATCH-1/TB blocked. The hatch is diamond plate steel located on the turbine floor. Pallets, a fan and a gantry were positioned on top of the hatch possibly preventing pressure relief during a HELB event. This issue is being reported as an unanalyzed condition per 10CFR50.72(b)(3)(ii)(B). All items were removed from the hatch by 1800 on September 9, 2013.</br>The licensee notified the NRC Resident Inspector.</br>* * * RETRACTION FROM JEREMY TANNER TO JOHN SHOEMAKER AT 1118 EDT ON 10/04/13 * * *</br>The licensee reviewed the design basis calculations and analyses for HELB events in the area where Hatch-1/TB is located. The review determined that it is acceptable to block or hold Hatch-1/TB down and that the painted markings on the hatch are overly restrictive. </br>In looking at HELB calculation of record, feed water break at the feed water pumps, there is no flow path modeled between the HELB volumes. Therefore, if Hatch-1/TB is blocked, the physical flow path is in accordance with the Gothic model of the HELB volume. Further, the analyses also indicated that no credit is taken for the hatch to relieve as no HELBs are postulated in the room under the hatch. Finally, Hatch 1/TB structural integrity was verified assuming a HELB occurred with the hatch blocked as described in notification 49335 (pallets, fan and gantry) the barrier would function as designed.</br>Licensee initiated a Work Request to remove any markings on Hatch-l/TB that indicate do not block or hold down.</br>The licensee will notify the NRC Resident Inspector.</br>The Region 3 Duty Officer (Valos) was notified.egion 3 Duty Officer (Valos) was notified. +
19:00:00, 9 September 2013 +
49,335 +
22:39:00, 9 September 2013 +
19:00:00, 9 September 2013 +
At 1400 (CDT) on September 9, 2013, plant … At 1400 (CDT) on September 9, 2013, plant personnel found HELB barrier HATCH-1/TB blocked. The hatch is diamond plate steel located on the turbine floor. Pallets, a fan and a gantry were positioned on top of the hatch possibly preventing pressure relief during a HELB event. This issue is being reported as an unanalyzed condition per 10CFR50.72(b)(3)(ii)(B). All items were removed from the hatch by 1800 on September 9, 2013.</br>The licensee notified the NRC Resident Inspector.</br>* * * RETRACTION FROM JEREMY TANNER TO JOHN SHOEMAKER AT 1118 EDT ON 10/04/13 * * *</br>The licensee reviewed the design basis calculations and analyses for HELB events in the area where Hatch-1/TB is located. The review determined that it is acceptable to block or hold Hatch-1/TB down and that the painted markings on the hatch are overly restrictive. </br>In looking at HELB calculation of record, feed water break at the feed water pumps, there is no flow path modeled between the HELB volumes. Therefore, if Hatch-1/TB is blocked, the physical flow path is in accordance with the Gothic model of the HELB volume. Further, the analyses also indicated that no credit is taken for the hatch to relieve as no HELBs are postulated in the room under the hatch. Finally, Hatch 1/TB structural integrity was verified assuming a HELB occurred with the hatch blocked as described in notification 49335 (pallets, fan and gantry) the barrier would function as designed.</br>Licensee initiated a Work Request to remove any markings on Hatch-l/TB that indicate do not block or hold down.</br>The licensee will notify the NRC Resident Inspector.</br>The Region 3 Duty Officer (Valos) was notified.egion 3 Duty Officer (Valos) was notified. +
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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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