 NT-01: Developed internal water leak after a few weeks of operation (may have been related to a beam incident). Managed internal water leak using helium.

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Presentation transcript:

 NT-01: Developed internal water leak after a few weeks of operation (may have been related to a beam incident). Managed internal water leak using helium backpressure > water pressure in target canister from 4/2005 through 8/2006  NT-02: Operated 6E20 POT with no indication of internal or external water leak (9/2006 through 7/2009)  NT-03: Operated 9/2009 through 5/2010; canister backpressure lowered from 23.5 psig to 12 psig 12/2/2009; experienced internal event May 2010 (internal water leak)  NT-04: Operated 8/2009 with 5 psig helium backpressure to align with pressure vessel code requirements and expected ANU operating parameters; operated for < 1 week with internal pressure event 9/9/2010 related to internal water leak  NT-05: Operation 11/1/2010 with 23.5 psig helium backpressure; developed internal helium leak into water system after 10 days operation on 11/11/2010; operated until appearance of a large external water leak 2/24/2011 NuMI Low Energy Target Brief Operational History Special Report NuMI Target Updates Special Report NuMI Target Updates Kris Anderson 07-Mar-2011 Kris Anderson 07-Mar-2011

 Of the 5 targets thus far, 3 quickly developed internal water leaks and only NT-02 has operated with a significant amount of POT and functioned without evidence of an internal water circuit leak  NT-02 exhibited loss of ν yield (~15% at peak) which may be due to radiation damage in the graphite fin structure  NT-02 currently has a frozen target z-drive mechanism  NT-02 currently resides at CO/RHF NuMI Low Energy Target Operational Summary Special Report NuMI Target Updates Special Report NuMI Target Updates

Special Report NuMI Target Updates Special Report NuMI Target Updates NuMI Low Energy Target General Assembly Layout Downstream Water Turnaround Weldments

Special Report NuMI Target Updates Special Report NuMI Target Updates

Special Report NuMI Target Updates Special Report NuMI Target Updates Current Activities- The Work I.Target Hall Activities Have moved used targets NT-03 and NT-04 to TSB (empty TH morgue) Prepare for installing next target on module and resuming operations II.Autopsy of NT-05 in Target Hall Workcell- Necessary to confirm NT-06 rework approach and procurement of NT-07 and NT-08 spare targets from IHEP Document as is condition with photographs and smoke leak test Cut off DS target snout (~6”) to expose water turnaround circuit and smoke leak test; cutting tool tests successful and ALARA plan in review Determine if other internal leaks are present III.Reclaim NT-02 as a contingency spare Still leak tight? Install target z-drive input shaft Unstick z-drive (we think DS bearing block is frozen) IV.NT-06 Retrofit

Special Report NuMI Target Updates Special Report NuMI Target Updates Current Activities- Timeframe I.Target Hall Activities Not on the critical path for resuming operation Morgue is empty and module will be ready to accept next target by 3/18 II.Autopsy of NT-05 in Target Hall Workcell Final cutter tests and approved ALARA plan expected by 3/9 Module with NT-05 will move to workcell 3/9 Document as is condition, cut snout, and smoke test 3/10 to check DS end as possible leak location Additional autopsy contingency thru 3/14 to check for other US leaks NT-05 to morgue 3/15 III.Reclaim NT-02 as a contingency spare- ALARA Plan Under Review Start leak check of NT-02 on 3/8 pending approval of procedure and ALARA plan If leak tight, install US z-drive coupling and recover z-drive motion IV.NT-06 Retrofit If autopsy of NT-05 shows leak at downstream end, start removal of target core from NT-06 casing on Friday 3/11 Schedule Estimate Schedule Estimate

Special Report NuMI Target Updates Special Report NuMI Target Updates Estimated Key Dates-Nominal Scenario with No Major Problems I. NT-02 Path (Contingency Target) NT-02 (if reclaimed) could be ready to move to Target Hall: Friday 3/18 (decision date) Complete installation of NT-02 into chase, beam scan, ready for normal beam operation: Monday 3/28/2011 II. NT-06 Path NT-06 rework complete 3/31 Install NT-06 in carrier, survey and final QA complete 4/8 Complete installation of NT-06 into chase, beam scan, ready for normal beam operation: Monday 4/18/2011 Key Dates

Contingency Slide for NT- 06 Retrofit Proposed Retrofit