Maico removed the containment box today allow Travis and I to further test the wiring harness. I disconnected the junction block and Travis and I repeated the test from yesterday. The all lines except the PNG tested OL. The module was then lowered and the twisted pair connected to the pin that corresponds to the steerer labeled BTM (it is likely this is not labeled correctly). This testing showed showed that the source of the short found yesterday is in the wiring harness or the source tray. The PNG gauge was then tested again. When beeping out the harness to find the location of the pin it was found that the short had gone away. This circuit was then tested with the megger at 500V and showed OL. Don Jackson has suggested looking at the SHV feed through. It is difficult to determine where the source of the problem is as it is intermittent. The source tray side wiring harness for the steerers was then disconnected from the steerers and tested to OL. Finally the connections on the source tray were tested. It was determined that the third socket down (see attached picture) has a short somewhere to ground. When Chad returns on Friday I will have him complete a visual inspection and if the source can be found we may be able to deflect the line. Failing that to repair this connection a new steerer cone assembly will need to be installed.

Using in cell camera and transit the suspect line on the steerers was inspected as best as possible. An existing photo of the complete steerers before installation was used for comparison. The wiring and beading inspected today showed no obvious problems, breaks or spots where there may be a short. In comparison to the photo from construction, what we could see of the steerers looked identical to the original installation.

chad fisher wrote:

Using in cell camera and transit the suspect line on the steerers was inspected as best as possible. An existing photo of the complete steerers before installation was used for comparison. The wiring and beading inspected today showed no obvious problems, breaks or spots where there may be a short. In comparison to the photo from construction, what we could see of the steerers looked identical to the original installation.

 The test was repeated to confirm that there was a short.

TM#3 with no target has been moved from the south hot cell to the northeast silo.

TM#4 with Ta#41 has moved to the south hot cell, the move it self was uneventful but, the fields on the module are extremely high when lowering it down into the south hot cell the module had a maximum field of about 392mSv/hr. The shield plug was also installed remotely as well due to the 12mSv/hr field at the top of the west target station due to shine from the dump.

Ta #47 has been removed from TM4.

One containment box cover bolt would not come out. Upon attempted removal with the stud remover the bolt sheared...which is not uncommon...just hasn't happened in many years...CBB being stuck or shearing.

Nine pin connector shows the typical "arcing" mark.

Electrical check of TM#4 with Ta#41 post beam at the south hot cell. See PDF for details

Electrical check was done on TM#4 without a target and with the UC#8 target on see attached PDF for results.

Chad and I leak checked TM4 heat shied water circuit at SHC. The pumping down was very good.Base leak rate 0.0xe-9 atm.cc/sec. BP 0.0xe-4torr. Sprayed helum twice on both VCR fittings.There is no response on leak detector.  The circuit is leak tight.

I have managed to reduce the field at the broken manipulator from 12 mSv/h to 400 uSv/h.

The repair/cable replacement on the east manipulator is now complete.

Yesterday's initail cable replacement went very well however, due to a minor glich, we were unable to test the tong movement until I was out of the hot cell. Tong did not fully close and felt like there was a "hard stop" at a repeatable spot in the  closing of the tong. Upon further investagation, I determined that the problem was definelty on the slave side.

I conducted a troublshooting exercise this morning to narrow down the problem. I quickly found that the new tong came from the manufacture with two incorrect fasteners (socket head cap screws) instead of set screws. As a result the tong was being kept from closing as the head of the socket head cap screws was interfering.

I replaced the SHCS was the set screws from the old tong. The tong now functions with full range of motion.

Jan. 15, 37 minutes in cell .26 mSv

Jan. 16, 16 minutes in cell (as I did some clean up of compressable waste) .05 mSv

Also, the inital repair utilized a prototype tool I designed (and with assistance from Maico, built). This tool made the repair much easier. I will be making small improvements to the design and issuing drawings to the vault and shop.

TM#4 has been moved from the south hot cell to the north west silo.

The Target Assembly was inspected with Chad, Jens Henning and Anders today.

• The Target Container was broken.
• Material was deposited on the Heat Shield around the Target Center Block
• Material was deposited on the IG-LIS source.
• Electrical checks to ground (HS)
  • The Extraction Electrode passed the electrical check at 1000V
  • The Exit Electrode (c) held only 40V at 22 kOhm
  • The IG Electrode 1 (f) held 250V at 390 MOhm
  • The IG Electrode 2 (g) held only 40V at 22 kOhm
• IG 1 and IG 2 both held 250V at 450 MOhm to Exit Electorde (c)
• No spark marks were observed on the 9-pin connector

See photos of the inspection on DocuShare

Chad and I leak checked TM2 tube heater(+) water line yesterday afternoon. The water line was difficult to pump down on base leak rate, but LD  base pressure was fine . The base pressure on leak detector was pumped to 0.0XE-4 torr quickly. The base leak rate only could be pumped  to  4.5 xE-8 atm.cc/sec after 1 hour waiting time. All vacuum connections to leak detector  in the target hall were leak checked and they were good. Chad checked helium flow in SHC. He sprayed helium twice on tube heater(+) water block soldering joints. I did not see any response on leak detector in TH.The base Leak rate and base pressure did not move up during the test.  See attachment pictures.

Chad and I did a pressure test on TM2 tube Heater+(D) water line.I pressurized the D line with shop air from quick connectors(both ends) on service cap.chad applied bubble soap onto the D water block in SHC. The test started from 5psi,and increased 5psi each time to 40 psi. From 5 to 35 psi, no bubble has been found on water block. At 40 psi , bubble appeared from blind blank off seal , but not from soldering joints. Since the o-ring seal for the blank off is  vacuum seal , but not for pressurizing, It is understandable the seal could not hold 40 psi pressure air. No bubble had been found on the D water block soldering joints .See attachment pictures.

Bevan and I did a leak check on TM2 tube heater+ from inside service cap in TH. The leak detector base leak rate 0.0xE-9 atm.cc/sec, base  pressure 0.0xE-4totrr. One of side panel on service cap was opened. Bevan sprayed the helium to the "D" line inside the blue insulator.The helium flow was checked , and he sprayed twice. No response has been found on leak detector.  See attachment pictures

Containment box has been removed and the blank off from circuit D has been removed for inspection of both the blank off and water block sealing surface.

New cleaning and polishing pads have been inserted onto the hot cell as well as rubber bungs and a new blank off.

The inital waterblock cleaning with the "scotch bright" pads has been completed. See attached pictures...the first picture being before and the second after.

Tommorow the water block will have bungs put in and a leak check to check the block will take place. After that, the new blank off will be installed and tested.

Chad and I  did the Leak checked TM2 tube heater (+) water line  with rubber insert plugged water block on " D"  in SHC. The Leak detector was very easy to pump down to the bottom leak rate and pressure. Chad checked the helium flow in SHC, and sprayed 10 second helium on  the block. There is no response had been found during the test. The test was repeated again and no leak has been found. See attachment pictures.

Chad and I did the pressure test on TM2tube heater+(D) water  line at SHC with shop air.We tested from 30psi to 80psi on both side of D line. The bubbles were found at 50-55psi on blank off seal in SHC.