On Friday, September 6, 2024 Model 'N' remote arm #9352 was removed from the NHC right side installed position to investigate  an ongoing issue with the tong motion circuit (no motion on the remote side when handle on operator side operated).

Inspection revealed that the tong cable on this arm have hopped its cable drum and rapped around the shaft of the cable drum. As well, the tong cable had hopped a lower pulley and was jammed between the pulley and casting of the pulley housing. These issues were corrected and arm#9352 was reinstalled onto the right hand position. This repair resolved an ongoing tong motion system stemming from November 2023 described below.

initial tong motion problem from November 2023 when the tong system jammed, operator side arm #9763, remote arm #9342.

Remote arm #9342 was removed and replaced with arm #9352 as it was suspected there was a hopped cable on #9342. Upon removal it was confirmed the tong cable on remote arm #9342 had indeed hopped the pulley. After installation of the "spare" remote arm #9352 that hAd not been installed since previous servicing and should have been completely operational, it was found the tong system still did not work properly.

Upon thorough inspection of operator arm # 9763 it was found that the tong cable was prematurely reaching the end of its travel on its drum causing the inability to activate the circuit. The tong cable was reset on its drum as per manufacture's specs with one full cable rap on the drum and one full pretension wrap of the tong drum spring.

Although this resolved part of the problem and allowed a full squeeze of the operator handle it did not result in transfer of motion through the system to the remote end.

Further investigation continued, separating the operator side arm from the seal tube and testing the seal tube and operator side arm independently. Both systems worked fine independently, pointing to a potential problem between the seal tube and spring loaded coupler on the remote arm.

Remote arm #9352 was removed and couplers visually inspected and end of seal tube on the hot side was inspected and found that the pin in the end of the shaft on the tong circuit was not installed symmetrically which could cause uneven pressure on the spring loaded coupler of the remote arm. This pin was adjusted and all pins on the hot side of the seal tube were dimpled and loctite applied as a precautionary measure.

This still did not remedy the tong motion problem. These led to the September 6, 2024 removal and repair of remote arm #9352. This arm had previously been serviced by a CRL technician in December of 2017 and had not been installed or used since and should have been in operational status. It is still not clear why it was not.

Over the course of September 9th - September 13, 2024 a CRL manipulator technician carried out the following manipulator maintenance:

NHC operator side arm #9763 (right side installed position) - Inspection and re-tensioning of tong cable prior to re-installation (was a little too tight). Operational.

E-HD clean spare #8015 - repaired stuck manual 'Z' motion - removed one rouge 5-40 screw that had been dropped inside remote end during 'Z' motion cable run through in 2017, found that related 5-40 screws from the cable end clamp were not tight and therefore proud and also jamming. Complete tape replacement and tensioning. This manipulator is fully back to operational status other then needing some screw for the air restriction on the remote end.

E-HD "dirty" spare #7985 - inspection and evaluation of parts on the operator side require to return to operational status. Wrist and handle reassembled (all parts of wrist and handle accounted for) Ball and socket joint at and of motion lock replaced (parts were on hand already) as well as tape motion lock assembly (parts on hand already). This arm may be missing a relay or two. Remote side still bagged with unrecorded issue (suspect it is only a broken tong cable) this will be put in the maintenance schedule for earl 2025.

NHC operator side "spare" arm #9351 - Damaged 'Z' motion tape replaced. Tensioning. Operational once 'Y' motion linear actuator re-installed.

Meson hall warm cell manipulators evaluated/inspected - No issue found

TM3 window line has been leak checked after containment box removal and installation for insulator installation on water cup C.   No leak.

10 pins lectrical check result after insulator is installed on water cap C.

pin 14 to 60kv bias has 20 Kohm @250V Megga check. The rest check on ohmmeter and megga @250 are either OLor over 25Mohm which are good.

 September 23, 2024 - C. Fisher 

• Containment box removed
• Insulator installed
• New window line VCR seals installed
• Dropped bolt from TiC#8 removed
• Containment box reinstalled

September 23, 2024 - A. Tam

• Containment box cover reinstalled 

Photos attached 

 5 shielding blocks have been moved from ITE to ITW.

HALCW O2 level sensor annual maintenance is done. sensor membrane has been changed and electrolyte has been refilled. gauge is calibrated. It works normal after the job.

Tm3 has been moved  from SHC to silo. the move is smooth.

TCS water system resistivity analyzer has been repaired. Two diodes and one capacitor on PS board were broken. They were replaced. Installed analyzer back and tested it in system. it works fine. Operator closed e-fault, removed force on TS5, and enabled alarm on TS5 and TC1.

TM2 has been moved from ITE to SHC. Peter did the move with Travis on help.  The move is smooth.

ABCD was dead shorted to 60kv bias during the first time measurement after target installation. Target was removed and reinstalled again with new VCR seals by Ferran.  during target removal process, short disappeared when Aaron remove bolts on CD tube heaters terminal.  leak check and electrical check result are good after second time target installation. 

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:
  • Phone not working at North hot cell operator station
• Target Hall:
  • Uncertain if NHC and SHC ventilation pressure gauges have recently been inspected

Action has been taken on all deficiencies.

 Resolution comment / Commentaire de résolution:

     Fixed issue by changing patch cord that was connected to the switch from patch panel.

Emile V

 5 shielding blocks are transferred from ITW to ITE, Target Area is secured again after moving.

TCS water system has been started for functional test. System parameters including  pressure, all temperature sensors, flow rate sensors, resistivity are ok. I will watch on chiller CP1/2/3 in rest of the week and make sure chiller CP1/2/ 3 auto stage in/out work fine.

 November 14, 2024 - Aaron Tam w/ Chad Fisher 

Following ID: 2716   
"Nov. 8, 2024 - Aaron Tam 
Tong cable snapped when attempting to remove multipin connector bracket"

Repair went as follows:

• weighted clip attached to tong return side to tension/keep tapes on pulleys
• Manipulator was pinned from both sides (Pinning from master side first makes it easier to position slave side)
• clamps were used to suspend all tapes and cables near the relay bracket 
• extension tube limit clamps were moved to the top to stop it from dropping when Z motion tapes disconnected
• Z motion tapes/tension adjusting screws taken off master carriage and suspended with equalizing weight ~10+ lbs)
• Extension tube limit clamps and extension tube lowered give space to expose multiplier later 
• Wrist joint and handle removed as a unit 
• extension tube to multiplier screws taken out
• Extension tube raised to expose multiplier - using extension tube to wrist joint positioning clamp to keep it in place 
• Old cable removed
• new cable installed

installation in reverse with spare master handle 

Notes:

Spare master wrist joint was missing gears that connect wrist drums 

• this had to be disassembled and installed with gears from old wrist joint

Handle ratcheting pawl spring was not oriented properly, so this had to be disassembled and reinstalled properly (in the process one spring was lost Part#: A-5800)
 

TM3 was moved from silo to SHC with no target. Move successful.

TM3 was moved from SHC to TCS with UCx#47. The move was smooth.

TM2 was moved from ITE to SHC with Ta#68 target. During the move, a railing was lightly bumped by the corner of the module - no obvious damage or issues have been observed. Otherwise, the move was smooth.

TM3 was moved with UCx#47 from TCS to ITE. The move was smooth.