On May 30 Aaron, Chad and I removed the empty LP FEBIAD target from the SHC into the anteroom to attempt to find out the source of the cathode short observed online. The behaviour online was that a connection of several hundred ohms was preventing the cathode from being biased. The resistance was still enough to allow us to run in anode mode, which is what we did. I am not sure where the cathode short came from but there was significant sparking on this module when ops conditioned it (destroyed the gmov of the COIL power supply and the electronics for anode/cathode switching) and we have seen this cause cathode shorts before. The shorted behaviour did not go away when the target was cooled down, so I assume it was permanent damage to one of the insulators. This would be either the support insulator, the trident insulator, the gas line insulator or one of the tube retainer insulators.

Since the target didn't see protons, we decided to take it out of the hot cell and disassemble it to find which insulator was broken. Unfortunately, it appeared totally fine outside of the hot cell, no shorts could be found. We disassembled it anyway to look for issues but all we saw was a heat mark on the copper plates covering the coil, underneat the target (see attachment). We even shook the target quite a bit, and didn't produce a short.

Maybe there was a trace created on one insulator by the sparking, which oxidized when exposed to air and became insulating again? We didn't see anything obvious on the insulators, but I'm not sure if we would expect to.

No conclusions from this work.

refilled TCS:TK2 to 27.4 inches to compensate water lost during THC filters change.

TCS water system  five filters were changed yesterday by plant group Dan.T. Service labels on filters are updated.  No water leak after job.

IG1S elbow o ring seal and a blank off cap o-ring seal beside the elbow were replaced on ITE entrance module top last Friday. IG1s has a higher than normal reading so i leak checked entrance module top last Thursday and found leaks to 5x E-8 atm.cc/sec leak on one of (or both of )these two o-rings seals. they are too close to identify exactly on which one was leaking so both o rings were replaced.  other air to vacuum seal on entrance module are leak free. 

The annual inspection of the main storage vault will be skipped this year since extensive inspection and testing was performed during the re-alignment job in May (see this e-log for details: e-log 2584). This included successful testing of the emergency close mechanism.

The mini storage vault was informally inspected by Adam Newsome on 2024-06-18. The following was checked:

• Cabling and cable management
• Connectors (note: the strain relief for the remote control input cable was loose - it was tightened)
• Controls box - external connectors and wiring
• Limit switches - wiring, mounting
• Motor visual check
• Drive wheels visual check
• Drive track visual check (note: the track had small pieces of metal shavings on it which were wiped off)
• Bearings visual check
• Miscellaneous fasteners visual check

Photos can be found in G:\remote handling\Facilities and Projects\ISAC\Mini Storage Vault\Inspections

The inspection was generally successful. No areas of concern. Regular inspection will resume next year.

The pail handling tool which is used to move 5 gallon pails around the target hall was inspected by A. Newsome. The main tool was checked, but not the spare as it is currently in a disassembled and unusable state. The tool appears to be in good, working condition. The following items were checked.

• Inspect structural integrity of long tube - check for bending, warpage, dents, cracks, rust/corrosion
• Inspect structural integrity of hook assembly - check for bending, warpage, dents, cracks, rust/corrosion
• Inspect fasteners - check all fasteners installed as per drawings, fasteners are tight (note: one fastener on crane interface subassembly was loose - all fasteners in these subassembly were tightened as a precautionary measure)
• Inspect crane interface assembly - check for damage and wear where the tool connects to the crane
• Check alignment - verify the tool connects to the crane and hangs vertically with no major misalignment (this step was not done - alignment is regularly checked during operations, and there was no concern as the tube was straight)

 Note: these tools are being inspected monthly by D. Wang and F. Song.

Photos can be found in G:\remote handling\Facilities and Projects\ISAC\Pail Handling Tool\Inspections\June 2024

IMPORTANT: the maximum load capacity and lifter tag for the tool are not present. There is a plan in place to affix these two labels in the very near future.

 5 gallon spent target pail, lifting long pole and hook assembly load test was done by Rupan, Keyur ,and David.  Load in pail 101 lbs, test time 10 minutes. No deform on pail( pail OD 29.8mm is not changed before and after test.  The test passed. Also 50 lbs load test on empty tray transit frame was done. The frame is good on test.  Rupan will have a test report on this job.

Nb#10target has been remotely  transferred from NHC to SHC. 

 5 shielding blocks have been moved from ITW to ITE, MAA area has been secured.

Today (2024-07-05), five flasks were loaded in preparation for shipment with the following targets: SiC#43 (Pail 272), SiC#44 (Pail 275), Ta#63 (Pail 266), UC#40 (Pail 278), UC#38 (Pail 274).

The crimped lifting loop has been applied to each pail. The locks have not yet been applied to the flasks at the time of writing this log, but will be done next week.

The mini-storage vault is now EMPTY. Because some of the pails had contamination (200 - 1500 CPM), it is highly recommended that the mini-storage vault be cleaned or at least swiped for contamination.

The target index spreadsheet has been updated (attached).

ITE:EL has been tripping off due to HV sparks. Usually this also trips ITE:Q1/2. These are sitting in side-by-side racks.

The working theory is that HV sparks are returning to ground through the EL and quads, tripping them off. Possibly this is the result of a changed low impedance ground path. How this change happened could be either something we did during shutdown or the changes we made in TM3, no clear evidence yet.

The goal of these changes is to stop the EL and quads from tripping, assuming the sparks are travelling through the ground.

Possible routes through ground to the EL power supply:

1. Through controls. EL is controlled by a canbus card. Preliminary investigations by Mike Rowe make it look like the canbus reads the PSU max voltage (60kV), then the staton bit trips, then after a while of trying to talk to the power supply, the statdrv is turned off. It is not clear why the power supply is turning itself off, since it doesn't seem to have a trip or protection circuit inside. To be further investigated.
2. Through the AC ground.
3. Through the shield on the output voltage conductor that runs to the pit.
4. Through the EL wire and conductor itself.

Current attempts to mitigate the tripping:

• Add an isolation step to the AC power, in case it is coming through AC ground (option #2).
• Add ferrites on the controls lines (option #1, this was done earlier and no effect has been seen).
• Add transient voltage suppresors on the Vmon, Imon, Vprog and Iprog control cables (option #1).
• Replace grounding cable with a grounding strip where the grounding wire used to be on ITE:EL. The ground wire was a braid, so probably not too bad, so not sure if this will help.
• Improve the connection between the two grounding bars in the racks. The grounding bar for th EL supply is well connected to the copper ground strip from ITE, but only connected through a small cable to the grounding bar for the quads. A copper foil sheet was added between them and the previously used wire was disconnected on the quad side bar..

An annual electrical and mechanical inspection was performed on the SMP today by Adam Newsome, Travis Cave, Riley Sykes, Maico Dalla Valle, and Jason Zhang as per Work Permit  I2024-07-10-1. The following items were checked:

• Check condition of wiring for physical/radiation/UV damage
  • OK, no signs of significant damage
• Check for cable tray debris or damage
  • There were multiple items in the cable tray which do not belong there - misc. pieces of wood and metal... these items were not disposed of but should be in the near future
• Check inside control panel: components and wiring, labeling
  • Labeling intact, components in good condition
  • Misc. random wires pulled to check... OK
• Verify camera views
  • This was not inspected in detail as it is something that would be done prior to remote operation
• Check connectors for damage
  • All connectors OK
• Check pendant for damage and verify labeling intact
  • Pendant OK
• Lid open/close test
  • Lid was opened and close multiple times - smooth operation, no concern
  • Lid close logic was checked - OK
• Vessel rotation and limit switch check
  • Both CW and CCW limits were checked, functioning
  • No concern on rotation - chain drive, rotary limit switch, and cable reel all functioning normally
• Lubricate chains
  • Not done - should be done next year
• Inspect tensioners
  • Done - OK
• Tighten fasteners
  • Not all fasteners were checked - washers will be replaced soon so this was not deemed necessary
  • Approximately 50 washers are missing for socket head screws in slotted parts. Not safety critical but they should be replaced soon.
• Visual inspection
  • All OK

Overall the inspection was successful.

 New spring idlers were installed onto rotational chain drive for SHC roof. Operation ran smoothly in both directions to full limit. Chain was noted to have adequate slack when not on driven side. Periodic checks to confirm operation will continue in the following months to guarantee proper operation.

 SS washers were added to all slotted holes on SMP chainguard cover plate

A safety walkaround for July 2024 was completed for the B2 level by A. Newsome. No deficiencies to report.

Results can be found in the master spreadsheet

 The UC#45 target was moved from the south hot cell to the spent target vault. It was place in Pail#292 spot 1A of the vault, was 19.5mSv/hr. Also this pail contains the target material of UC#44. See attached PDF for more details.

 5 shielding blocks have been transferred from ITE to ITW. MAA is secured again after moving.

 SiC#46 loaded into pail 293 successfully along with other hotcell waste 

Upon visual inspection of the target, a spark-sign was spotted on the perimeter of the extraction electrode. Metallic looking material also found built up between the extraction electrode and the backing plate of the target 

Photo attached 

 SiC#46 (pail 293) was placed in the vault (spot 3B) on Wednesday the 14^th of August. It was 111 mSv/hr when removed from the south hot cell. See attached PDF for details.

TiC#7 failed after two weeks of operations - measurements in the electrical room indicated that the negative side of the CHT was broken (35kOhms to the rest of the target). This was likely due to a large number of proton trips during this target run. At every trip I could see the CHT voltage getting higher and more unstable. This cahnge in voltage was reflected in the unstable anode current and fluctuating RIB beam intensity, as a direct result of the fluctuating power on the CHT. The break was confirmed in PIE, loosening the screws caused the target container to come off without the cathode. Otherwise nothing unusual was seen. The anode wire connections seem very robust, dragging the target around with the multipin disconnected, flipping it up and down, etc and the anode wire stayed attached. Though we saw lots of outgassing on this target, things looked the normal level of dirty. There was no buildup between PE and EE.