Monday, August 12, 2024, 15:55, Aaron Tam, South Hot-Cell, Standard Operation, TM2, Ta#67 LP-SIS, Target Loading
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Ta#67 Target loaded onto TM2
Leak check passed
Electrical test passed after loosening off target electrode conductor screws, and torqueing by feel
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Sunday, August 11, 2024, 11:25, Carla Babcock, South Hot-Cell, Repair, TM3, TiC#8, short on multipin wires to TBHT discovered
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With the new TiC#8 target installed on TM3, there was a ~7kOhm connection between TGHT/TBHT (A/B/C/D) and HV common. The standard electrical check on the module showed standard values, so it was assumed the problem was inside the target.
Started removing bolts/water connections one by one to see if any of them had an effect on the measurement. Found that disconnecting the multipin on the target from the mating connector on the source tray resolved the issue. Determined that the only way this could happen is if a spark cut through the insulation covering the multipin wires. Because of the way they are routed, they can touch the water lines and they are definitely touching waterline C, TBHT-. We do not typically check continuity of multipins to all water lines, just to HVC, so did not see this in the standard electrical check. Measurements verified that pin 2-4 was touching water line C, creating a short from TGHT/TBHT to HV common when the multipin connector is attached, since the pins are shorted to HVC inside the connector when they are not used.
Issue was solved by removing the target into the ante room, removing connector 1 all together since it was not used, and removing the grounding on the other pins, leaving only pin 2-2 connected for the anode.
In future we will change the IGLIS wiring so pin 2-4 is not used, and redesign the cable routing so it cannot touch the blocks. For the immediate term, we will add to the electrical check a check of each pin to TBHT/TGHT/COIL. |
Friday, August 09, 2024, 19:01, David Wang, ITW, Standard Operation, TM3, TiC#8., TM3 has been connected in ITW.
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TM3 has been connected in ITW. See attachment for checklist. |
Friday, August 09, 2024, 18:20, David Wang, ITW, Standard Operation, TM3, TiC#8, TM3 has been moved from SHC to ITW.
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With TiC # 8 installed, TM3 has been moved from SHc to ITW. The move is smooth. |
Friday, August 09, 2024, 18:18, David Wang, ITW, Standard Operation, TM4, TiC#7, Tm4 has been moved from ITW to SMP.
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Tm4 has been moved from ITW to SMP. the move is successful. |
Friday, August 09, 2024, 16:15, Frank Song, South Hot-Cell, Repair, TM3, TiC#8, electrical check/leak check
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TM3 with replaced target TiC#8 has been checked on SHC before moving to ITW. Pls see attachment |
Friday, August 09, 2024, 08:11, Frank Song, ITW, Standard Operation, TM4, TiC#7, module disconnection
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TM4 with spent target TiC#7 (dead) was disconnected in ITW and ready to move to TCS. |
Thursday, August 08, 2024, 13:58, David Wang, South Hot-Cell, Standard Operation, TM3, SiC #46, TM3 SiC#46 electrical check at SHC with target on (After operation)
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ABCD is short to 60KV bias. Othjer are ok. see attachment.
Found afterwards that this short was due to sparking through the multipin wire insulation where the wires pass behind the TBHT block "C". See fault 17265. |
Thursday, August 08, 2024, 11:41, David Wang, South Hot-Cell, Standard Operation, TM3, SiC #46, Tm3 was moved from ITE to TCS this Tuesaday, then to SHC this morning.
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Tm3 was moved from ITE to TCS this Tuesday, then to SHC this morning. Both moves are successful. |
Tuesday, August 06, 2024, 09:16, Frank Song, ITE, Standard Operation, TM3, SiC#46, module disconnection
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TM3 with spent target SiC#46 was disconnected in ITE and ready to move to TCS soon. |
Wednesday, July 24, 2024, 10:10, Frank Song, ITE/ITW/Storage Area, Standard Operation, , , shielding blocks transfer
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5 shielding blocks have been transferred from ITE to ITW. MAA is secured again after moving. |
Thursday, July 18, 2024, 11:22, Travis Cave, Spent Target Vault, Standard Operation, , UC#45, Spent Target Move
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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. |
Wednesday, July 17, 2024, 15:06, Adam Newsome, Facilities, Standard Operation, , , Safety Walkaround Complete - SHC/NHC Area
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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 |
Tuesday, July 16, 2024, 13:14, Frank Song, ITW, Standard Operation, TM4, TiC#7, Module Connection
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TM4 with TiC#7 was connected in ITW, all TPs are running at full speed. |
Tuesday, July 16, 2024, 11:15, David Wang, ITW, Standard Operation, TM4, TiC #7 febiad. , TM4 has been moved from TCS to ITW.
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TM4 has been moved from TCS to ITW. the move is smooth. |
Tuesday, July 16, 2024, 11:15, David Wang, ITW, Standard Operation, TM4, TiC #7 febiad. , TM4 has been moved from TCS to ITW.
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TM4 has been moved from TCS to ITW. the move is smooth. |
Friday, July 12, 2024, 08:51, Riley Sykes, Safe Module Parking, Maintenance, , , SMP chain guard
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SS washers were added to all slotted holes on SMP chainguard cover plate |
Wednesday, July 10, 2024, 10:44, Riley Sykes, South Hot-Cell, Maintenance, , , Spring idler install
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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. |
Wednesday, July 10, 2024, 09:55, Adam Newsome, Safe Module Parking, Maintenance, , , Annual electrical and mechanical inspection of Safe Module Parking
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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
- Check pendant for damage and verify labeling intact
- 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
- 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
Overall the inspection was successful. |
Tuesday, July 09, 2024, 16:14, Carla Babcock, ITE, Repair, , , Attempts to reduce ITE:EL trips from HV sparks 8x
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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:
- 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.
- Through the AC ground.
- Through the shield on the output voltage conductor that runs to the pit.
- 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..
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