Upon attempting to lower Pail 211 into their tile hole, CNL encountered issues with the pail getting stuck. They shipped the pail back to TRIUMF and requested we perform an investigation. The investigation report is attached.

The pail contents must be re-packaged into a new pail.

Note: the F-308 is currently sitting in the Meson Hall warm cell at approximately 250 uSv/h at 0.5 m.

Dose for primary worker (Chad Fisher) who inspected the cable, unbolted the flask lid, and handled the pail briefly: approx. 104 uSv

Dose for secondary worker (Danka Krsmanovic) who swiped the pail and flask to check for contamination: approx. 70 uSv

More photos available upon request from Adam Newsome.

 The spent Nb#11 target was removed from the south hot cell and place in the spent target vault. It was placed in pail #283 and place in spot 7B is was 65.7mSv/hr upon removal. see pdf for further vault details.

HALCW system O2 sensor service and calibration were done in Sep 26th. electrolyte and membrane on rose mount sensor 499ADO were refilled and replaced. Sensor was zero and full scale calibrated. The sensor works fine after the job.

ITH:MP1 is replaced this morning due to its poor performance started yesterday afternoon. The general field in pit is about 260usv/hr. the contact field on pump is 2.0 msv/hr. New pump works good. Lubricant in pump will be drained next week. then motor will be removed. The pump body will be bagged and stored in silo area.

 All 20 targets in the vault were measured. The target spread sheet updated. See attached PDF for details.

The following four pails were moved from the main storage vault to the mini storage vault, to stage for shipping in Jan. 2024:

1. Pail 260 (SiC#41), Tray 5B
2. Pail 271 (SiC#42), Tray 2B
3. Pail 246 (Nb#10), Tray 6C
4. Pail 265 (UCx#36), Tray 2A

There is current one open slot in the mini storage vault which is planned for the Ta#58 target (formerly in Pail 211, to be repacked in Dec. 2023).

Target Index spreadsheet updated.

See attached printout with mini storage status.

During operation today, it was observed that the main vault door had issues opening.. typically when the door was around 80-90% opened, it would stop motion. Note that this issue has allegedly been present since early 2023. It appeared that the motor was still spinning but the clutch was slipping. This issue was consistent and observed multiple times when trays 2, 5, and 6 were engaged (note these are all on the same side of the vault). It was overcome by backing the door up slightly then trying again. The door close function worked with no issue.

It is suspected that there is a problem with the clutch or potentially a piece of debris on the track. [no longer true after 2023-11-17 inspection]

Edit [2023-11-17]: Maico Dalla Valle and Adam Newsome inspected the vault on 2023-11-17. It was very clear that the door, when opening, is rubbing up against the rails. Specifically, the side rollers located on each side of the vault (red housing). There are clear wear marks on each side. The skew is obvious because on one side, the wear marks begin immediately and stop halfway through travel, whereas the other side shows the reverse wear pattern. It is therefore suspected that the skew has become so significant that the friction is too high towards the end of travel which causes the clutch to slip. The travel rails were cleaned (significant grime buildup) and the offending side was filed down slightly (a sharp burr was present from the wear). It is not advised to adjust the clutch. Next steps: open and close the vault with no trays engaged to see if the issue persists (perhaps weight distribution was the issue), and then try different combinations of weight distribution to try to replicate the issue. After this, measure separation distance between guide rails at different points and try to identify the source of the skew issue and rectify it.
 

Edit [2023-11-20]: Maico and Adam performed further investigation by opening and closing the vault door under 3 different configurations: no trays engaged, 2 trays engaged on West side, 2 trays engaged on East side. The previously observed stopping issue was not observed this time under multiple cycles with each configuration. It is noted that the door appears to slow down slightly and experience a bit of a "chugging along" motion towards the end of travel when opening. Based on these observations, it is concluded that the cleaning and filing helped enough to allow the door to fully travel open/close without getting stuck. The root cause of the issue still remains to be fixed, but for now there is no major concern. Before end of 2023, measurements and planning will be performed to develop a proper repair for the root cause. It is expected that either late 2023 or early 2024, the repair will be attempted.

Edit [2023-11-22]: during a routine spent target exchange, the issue was not observed when opening tray number 2. 

Edit [2023-11-24]: a dial indicator was set up on the vault on the right side (looking down from above), mounted on the traveling part with the tip touching the black structural member where the wear is observed. The purpose is to determine how much out of alignment the door is with respect to the structural assembly. The following was observed: approximately halfway through the travel, the indicator read approximately 185 thou of travel. This corresponds to when the wear marks start to occur and where the small red enclosure around the roller wheel interferes with the structural member (causing the wear strip). At this point, as expected, the indicator no longer changes because the roller wheel has bumped up against the structural member. This implies the gap between the structural member and the roller wheel, when the door is closed, is approx. 185 thou on the right side (and 0 on the left side). These values reverse around the midpoint of travel. It is suspected that because of this, and because there is a small observable gap between the door and the vault when it is fully close, the right and left side of the door are not parallel with respect to each other. In other words, adjusting the angle so that the starting gap is roughly 92.5 thou on each side should resolve the issue. Measurements to confirm parallel-ness between each side will be performed, and then an adjustment will be made to create even gaps between each side at the starting point. After this, a dial indicator will be set up again to confirm that, when opening the door, the gap is maintained throughout the duration of travel. Small deviations are acceptable, but in general what should be observed is a roughly constant gap, and no interference (i.e. if the gap begins at 92.5 thou, it should not drop to 0 or not exceed 185 thou, but should hover somewhere on the order of 20 to 140 thou, for example).

 

Edit [2023-11-24, 2]: a dial indicator was set up on the left side of the vault in a similar manner as described above. In this case, the indicator's reading remained roughly constant during the start of travel (starting with the door closed and opening it up), with only up to around 10-20 thou variation at first slowly, followed by a slow increase to up to approximately 135 thou. This is similar to the 185 thou observed on the other side. One suggested means of resolving the issue is: raise the entire door slightly with overhead crane, translate it sideways approximately half of door's lateral travel distance (i.e. around 90 thou) and then lowering it back down. This should, in theory, be acceptable. It may not resolve the issue of whether the door is rotated, but should give enough clearance on both sides throughout the entire range of motion to be deemed an acceptable fix. Other opinions will be gathered on the subject to determine if this could work. 

 3 light bulbs replaced in the ISAC South Hot Cell - North West light, South west light, and South East light bulbs. Northeast light currently still working.

The South East light is not working after bulb replacement. This bulb was tested using the wires from the Northeast light station and the bulb is working properly. Electrical services is being contacted to troubleshoot the cable issues. 

The spent Ta#65 target was removed from the south hot cell and placed in the spent target vault. It was placed in pail #284 and placed in spot 2B. It was 41 mSv/hr at 1 m upon removal. Target index spreadsheet updated.

It is reported that the crane's hook rotation is not working currently. It was working yesterday (Nov 22). Investigation to follow, and this e-log will be updated.

Edit [2023-11-23]: the issue was a result of a tripped circuit breaker. Perhaps the motor became overloaded. It is advised to monitor the rotation mechanism over the new few operations, and rotate the hook CW and CCW prior to performing any critical operation to confirm it is working.

Broken tong cable on SW manipulator (serial #8106) of SHC was replaced today.

Following ISAC Hot Cell entry procedure, Document 157554, SHC was entered and wrist and tong cable were replaced with a pre-run/assembled wrist, cable and tong. It is standard to try and pre-make/load a new cable into a spare tong assembly to reduce time spent in the HC. This marks the first time a wrist has been replaced. Rationale for replacing the wrist at this time is that internal spacer A-14118 which the ting cable rides over has had grooves worn into it. This is a result of regular wear and tear but could be causing premature wear on the tong cable. Replacement is a preventative measure. This is the original wrist and spacer from the original install in 1998. The wrist that was removed will be rebuilt and swapped out with the original one on the SE manipulator (serial #7986) at a later date.

Parts replaced today are: New - Bottom half of wrist joint (CRL-13950), New - Tong cable (CRL-14230) and used tong assembly (CRL-18062)

Procedure took about 40 minutes. Dose received was ~0.046 uSv

Pumped down the gas lines in ITE on Tuesday Nov. 28 2023 and opened the CF4 bottle valves. Missed the small section between the regulator and SV2 though, so will probably redo it.

Pumped down again on Dec. 12 2023. Was taking a long time so might not be as good as earlier. Maybe there is a leak in there...

Pail 211 which contained Ta#58 spent target was repackaged into Pail 286 in the South Hot Cell.

The dose rate at approx. 1 m was 4.16 mSv/h.

Pail 286 was transferred to the mini-storage vault and placed in the outermost location. The mini-storage vault is full at this time, in preparation for the next shipment.

 The spent Ta#66 was moved from the south hot cell to the spent target vault, it was placed in pail#285 and placed in spot 5B of the vault. The target was 46.2mSv/hr when removed from the south hot cell. See the attached PDF for vault details.

ITW entrance module has been disconnected per document190510. It will be moved to SHC for diagnostic group tomorrow.

ITW entrance module has been moved from ITW to SHC. The move is smooth.  I cleaned entrance module tank flange and o r-ing slot.  entrance module tank flange o ring  is replaced .

On Jan. 9 we did the PIE on Ta#66. Opened the heat shield and removed the EE. The inside of the heat shield was very black with lots of flakes falling off. The target itself looked overheated, and the container looked pretty bad for a Ta target. The outside of the EE looked perfect but after removing it there was a lot of black stuff on the side and we saw that the Re foil was curled up. Jens said during the runtime that he saw something that looked like a wire in the beam path, so maybe this was it.

ITW entrance module has been moved from SHC to ITW. A slightly bump on module shielding block bottom side corner to tank vessel side when lowed module into tank. No big concern on this slight  bumping. Otherwise the move is perfect.

Entrance module has been connected in ITW pit per document 190510 " entrance module disconnection and removal procedure".