TH crane main hoist B starting delay issue appears again this Thursday. It is about 1 minute waiting time after power on the crane. this is an old problem we spent so much time in investigation and tried solve during last summer and fall. During this period, the delay time became shorter and the problem disappeared completely in November. It worked fine since then  until this this day. TH crane still works fine other than it. I will watch in this issue closely. 

Broken tong cable on West manipulator (serial #8106) replaced.

Wrist joint with broken cable was replaced with the spare wrist joint, pre-strung with a new tong cable. Tong cable is routed the "new" way (as described in April 3, 2024 wrist replacement), over the interior spacer.

Both East and West manipulators now have wrists with cables routed in this fashion which, in theory should result in longer cable life.

Tong cable in East manipulator #7986 was visually checked and looks in good shape.

Handle cable on #7986 is still routed under the spacer in the wrist and should be replaced with a new cable routed above the spacer next time it needs service.

 TM2 with UC#49 Febiad is connected in ITW. Form attached.

 5 shielding blocks have been transferred to ITE from storage area, the WP#I2025-05-14-2.

AlphaCAM has been replaced and tested by RPG in MAA target hall. (per Document-154779)

WorkPermit # I2025-05-13-3

MCR Travis Curucz , Frank, and I finished BL2A MAA ASU test per document 154779. everything works fine. Travis kept  the test document.

May 7th, 2025 - Aaron Schmidt, Aaron Tam 

UC#49 Handover - good

• April 30th - Initial fit check was performed
  
  • This is a new procedure that allows time for any potential modifications to be made. 
• May 7th ~9:00am Target taken out of glovebox and tested for fit
• Target legs and mounting bolts all thread in nicely. Bottom 2 conductor leg mounting holes have slightest misalignment.
• Target bagged, and brought to ISAC Hot-cells anteroom

Target inserted into NHC - successful

•  Target loaded onto cart without issue

Target Install - Complicated 

• Gas line gasket dislodged upon fully inserting target onto source-tray guide-pins
• During the attempt to remove target from source-tray, East manipulator tong cable hopped off a pully
  • This is the same slave manip that was recently replaced ID: 2799 
• Attempts to reinstall the gasket proved unsuccessful, and gasket was ultimately lost under the source-tray
• 3 more gaskets were inserted into the Hot cells, with the same unsuccessful outcome
  • gaskets lost underneath source-tray
• One attempt to install a side loading gasket was tried
  
  • stopped after the first try as the tool is liable to fling the gasket to a critical area 
• Aaron Schmidt made a new tool to install a male-side gasket
  • This proved to be successful (photo shown)
• The rest of the install procedure was successful 
  
  • without the East manipulator functional, west manipulator was used
  • west manipulator has a smaller tong opening to avoid cable hopping 
  • Finishing at 3:00pm UC target exposed to air for ~6 hours

 TM2 with new target UC#49 installed is E/L checked on the flange of NHC in TH. see attachment for detail.

 TM4 with first target UC#48 of this year has been connected in ITE. see attachment please.

Remote end 9352 replaced with end 9764 due to signs of an issue with the tong cable (tong opening excessively large and slack in cable on one side). Upon replacement tong opening on 9764 also opened larger then the remote end was set to. Everything is operational but this phenomenon indicates the handle cable system on operator side must be where the excess is coming for. This is further indicted but the position of the locking screw on the handle cable drum on the operator side, typically ccw of the hole location but now cw of the locking hole location. When there is a two week period between target changes in the NHC I would suggest swapping this operator arm with the spare.

Findings

• During April 2025 safety walk ID: 2796 , it was noted that the oil level in NHC window oil expansion tank was below the indicator range.
• previous safety walks from July, October, Jan 2024 did not show any issues, but this was not a recorded item, only to check for leaks 
• No visible leaks from the exterior can be seen. 
• No air gap can be seen inside the window, so it is completely filled
• Last fill date September 28, 2022, no notes of finding a leak prior to, or after the fill
  •  ID: 2369 Entry time: Wednesday, September 28, 2022, 13:15

NHC Window Oil Filling

• Oil used was from a separate pail labeled Hot Cell Window Oil, believed to have come from the 55gal mother pail containing Penreco Drakeol 10 B LT Mineral Oil NF
• Nitrogen supply needle valve was closed to prevent oil from blocking this line
• Oil was filled from the removed pressure relief valve position which deviates from the procedure previously used ( ID: 2369 )
  
  • This was done to avoid oil from entering nitrogen supply line and limit oil from entering pressure gauge 
  • Valve from previous fill location (alleged old accumulator location) was also open to encourage better breathing
• ~1,775mL added via squeeze bottle before oil was seen in the indicator tube. Another ~1100mL was added via squeeze bottle to bring oil fill indicator to the previous 2022 fill mark that is about halfway up the tube. 2,875mL Total
  • This is considerably more oil added than in 2022 (1.5L)
  • Location of oil level and fill date marked on indicator tube and on reservoir  with blue Sharpie 
• Accumulator valve closed, Pressure relieve valve re-installed, nitrogen supply line valve opened 
  • 1.8 inH2O reached in ~10 minutes. 2.2inH2O was indicated the next morning 

Notes

• Oil level check on quarterly safety walks will be added
• Increased checking interval during the first quarter will be performed 
• Unrelated NHC entries in 2024 did not note any oil leaks, so not sure where 2.5L+ of oil has gone in 2.5 years
• SHC window oil level has remained about halfway up the indicator tube. 

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May 12, 2025 - Aaron Tam 

Oil fill check 

• Two observations were made on the oil level. Once on May 6th with ~0.5cm below mark and may 12th ~1cm below mark
  • Photos uploaded 
• Nitrogen pressure is higher than last recorded at 3.1 inH2O
• I have a suspicion that a large gas bubble exists above the window in a separate holding tank. More observations to come 

 TM#4 with UC#48 went from the conditioning station  to the east target station.

A safety walkaround was completed for the ISAC Hot Cells and Target Hall Areas.

The resulting spreadsheet can be found on DocuShare as Document-242733.

Main deficiencies identified:

• Hot Cells:
  • Overdue fire extinguisher inspection
  • NHC oil level depleted - to be filled
  • SHC breathable air certification expired (may have been checked but just not updated - to follow up)
  • SHC left manipulator tong cable snapped (planned May 22 repair)
• Target Hall:
  • NHC depression indicator calibration expired and reading is 0 (requested mech services to check this in Oct 2024)

Action has been, or will be, taken on all deficiencies.

Refilled TCS:TK2 from 11" to 28.8 ".

C. Fisher, A. Schmidt, A. Tam

UC#48 Handover satisfactory

• Target taken out of glovebox and tested for fit
• The left most triplet conductor leg was seen to be slightly misaligned, but the test fit showed that the bolt still threads on with some flexing from the suspect target leg.

Target inserted into NHC successfully

•  tight fit with IGLIS means some rubbing of the two conductor legs did occur with the tool port tunnel
• NHC target tray used, so tray from transportation was left in anteroom 
• HVAC vacuum pressure dropped below threshold for a minute while toolport door was open.
  • Operations chained off SHC doors and RPG got involved to ensure the safety of everyone in the area

Target Install successful

• A moment of rough handling of the target occurred when tilting the target towards operator in preparation for install
• The suspected misaligned conductor leg did not initially accept a screw, but the use of a T-handled allen key and using a different screw from the package worked
• Leak checks successful
• Electrical checks successful

Replacements of NHC tool cart has been built, but some modifications may be made before it is inserted into the hotcell

 TM4 with UC48 went on a long trip from the north hot cell to the conditioning station.

 TM4 with new target UCx#48 installed was E/L checked on the top of NHC, see attachment uploaded with pls.

TM4 was moved from Safe Module Parking to the North Hot Cell today.

Tong cable on remote arm 9**4 has be relocated onto its pulleys and tong opening adjusted at the tong cable drum by changing the position of the tong cable screws by two positions (tightened/closed) such that the air tool will fit in the tong and some of the slack in the tong system has been taking up.

An attempt was made to also adjust the elevation twist pulley block which would also aid in taking up slack in the tong system however, the elevation twist pulley block was already and the end of its adjustment. Elevation twist cables are measuring 10 in lbs, the nominal value that they should be at is 15.

Tong system has been cycled multiple times and the tong cable itself looks good. This arm should be good for service however, I recommend a new pulley block be ordered and the new one dimensional compared to the existing. If they are the same we may consider shortening the new pulley block to achieve a window for tensioning, after which I would recommend the pulley blocks be swapped...swapping should only take place after 9342 has had the tong cable replaced and we can be more confident in its operational state, or in the 2026 shutdown in allowed.