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On March 23, 2011, a technician was instal … On March 23, 2011, a technician was installing a VariSource High Dose Rate (HDR) Afterloader - Model VariSource IX when the active wire composed of a 10 Ci Ir-192 source failed to extend. After troubleshooting it was discovered that the wire was stuck on the wedge block which is part of the emergency retract mechanism. (See NRC Event Notice 46695)</br>Engineering evaluation by the vendor, Varian Medical Systems, Inc., has identified a very small amount of material in the wedge block which has a small bore that the source wire passes through. Otherwise, nothing remarkable was identified. </br>This machine is a new unit with a very low number of source extensions. There is no history of similar events with new units of this type.</br>The vendor has issued a Tech Tip for all new sites and is investigating a new design for the wedge block with a goal of implementing any new design by April 30, 2012. Additionally, all VariSource HDR customers have received a copy of Customer Technical Bulletin CTB-VS-640A that discusses the potential of source wire path constriction and source wire jamming.path constriction and source wire jamming. +
04:00:00, 23 March 2011 +
46,758 +
15:12:00, 15 April 2011 +
04:00:00, 23 March 2011 +
On March 23, 2011, a technician was instal … On March 23, 2011, a technician was installing a VariSource High Dose Rate (HDR) Afterloader - Model VariSource IX when the active wire composed of a 10 Ci Ir-192 source failed to extend. After troubleshooting it was discovered that the wire was stuck on the wedge block which is part of the emergency retract mechanism. (See NRC Event Notice 46695)</br>Engineering evaluation by the vendor, Varian Medical Systems, Inc., has identified a very small amount of material in the wedge block which has a small bore that the source wire passes through. Otherwise, nothing remarkable was identified. </br>This machine is a new unit with a very low number of source extensions. There is no history of similar events with new units of this type.</br>The vendor has issued a Tech Tip for all new sites and is investigating a new design for the wedge block with a goal of implementing any new design by April 30, 2012. Additionally, all VariSource HDR customers have received a copy of Customer Technical Bulletin CTB-VS-640A that discusses the potential of source wire path constriction and source wire jamming.path constriction and source wire jamming. +
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00:00:00, 15 April 2011 +
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15:12:00, 15 April 2011 +
23.467 d (563.2 hours, 3.352 weeks, 0.771 months) +
04:00:00, 23 March 2011 +
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