On April 2, 2024 the wrist on the SE manipulator of the SHC (Serial # 7986) was swapped with a rebuild unit originally from SW position (serial # 8106). The "new" wrist was a wrist + tong assembled unit with the tong cable being routed if-front of the spacer A-14118 rather then behind as in all previous replacements (see attached pictures). This change was a result of a discussion with Central Research's senior repair technician who informed us that the original routing was incorrect from the factory. This can be seen when inspecting unit we have on-site that are still in the original configuration from the factory as about half are routed one way and half the other.

On Wednesday, May 22, 2024 UCx#45 was installed on TM4 in the SHC. Installation was normal other then minor issue with the multipin connector drive screw not engaging and/or driving properly. This was remedied by loosening the left guide bolt slightly (1/2 turn). After loosening the multipin drove in and seated correctly (verified by camera). High current fasteners torqued to 130 in lbs.

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

UCx#46 removed from TM4 and placed into a pail back-filled with argon. Nothing visually unusual; no issues.

The spent target vault door does not open or close. The emergency door closing did have to be used to close the door as it was locked in an open position, the door stopped just off the open override limit. The door was closed and the spent target that was being assayed was placed into the mini storage. The problem with the door appears to be related to the motor itself, as all the controls to the motor appear to be in working order. Also it was noticed on the emergency door closing winch the wire rope has a kink in it from sitting in open position for so long this can cause the wire rope to jump from the pulleys.

6/27/2016  Dan McDonald. Replacement motor was ordered from Beaver Industries Friday the 24th received this morning the 27th. Once received Travis wired the motor to its proper operating orientation. Once the motor was wired  it was  set it up and plugged it in to test rotation and control function, at this point we disconnected the motor and re installed it to the gear box. Ran three open close sequences to ensure all was well. In the case of the emergency cable system a plan is being developed to correct the cable slack and kinking problem. We went ahead and ordered a spare  vault motor which is located in the RH Machine Shop 

Move went well no problems readings at East Target Station were very high at 500mSv/hr.

See attached PDF for the details.

Move completed, move went well.

Ta#35, in pail #88, has been place into spent target storage, in spot 6C. Upon removal from the South Hot Cell it was 411mSv/hr our hottest target to be placed into storage to date. There are 8 free slots for targets left in the vault.

TM#1 has been moved from the Conditioning Station to the South Hot Cell for the installation of Ta#37.

TM#1 has passed the the electrical check.

Tm#1 with Ta#37 moved from the south hot cell to the conditioning station. Move went well.

TM#1 with Ta#37 has been moved from the conditioning station to the the west target station, move went well.

Ta#37 has been moved from the south hot cell into the storage vault. The target is in pail #89 and in spot 6A in the vault. It was 840uSv/hr upon removal from the south hot cell. There are 7 free spots left in the vault.

Move of TM#4 with Ta#36 from East target station to south hot cell, move went well.

TM#4 moved from South Hot Cell to to North East Silo, move went well.

The spent Ta#36 has been moved to the storage vault. It was placed in pail #90, and placed into slot 3B, it was 111mSv/hr upon removal from the south hot cell. There are 6 free slots left in the storage vault.

TM#1 with UCx#2 has been moved from the west station to the south hot cell. Move went well.

TM#1 with TaC#1 installed passed the electrical test. With a value of 882MOhms that was meggered from the heat shield to the chassis, all other measurements are within spec.