For the week of November 7th 2011, four of a possible ten targets that are in storage were assayed. Targets are as follows:

Target             General average field @ 1 metre from edge of pail

SiC#24           1.99 mSv/hr

Nb#4               3.89 mSv/hr

Ta#25              4.57 mSv/hr

Ta#37              0.47 mSv/hr

These four are all viable spent targets to be shipped. We still need another couple of days of "UNINTERRUPTED" time to assay the remaining six targets, for us to have enough to make a ship of five to Chalk River.

Spent target assay completed. A total of 16 target were looked at, 13 were low enough to be assayed and those 13 are at shippable levels, the other 3 of the 16 looked at were too hot to ship and assay. See attached pdf for complete details.

Ten targets have been assayed or had field measurements(they were too hot to ship but were assayed the last time an assay was done) done on them  over the past two days. Of those that have been assayed we have total of ten shippable targets. See the attached PDF for the latest details of the storage vault.

 The spent target assay was aborted today after the first target was finished due to the very old computer that controls the camera and the vault door effectively died. The vault door had to be closed using the emergency door closing winch which worked so it passed that test.

 All targets in the ISAC Spent Target Vault have been either assayed and had field measurement done on them or just measurement if to hot to assay.

The special tool made for the RFQ target autopsy has been inserted into the hot cell.

4-40 button head screws have been successfully lossened.

The linear actuator used for the Y-motion motor assistance on the spare telemanipulator was replaced and tested. It was observed around September 2021 that the former one which was installed was causing fuses to blow for the main 120 VAC power supply in the control box. After some troubleshooting, it was determined that the linear actuator itself did not operate smoothly - it was suspected that this caused motor overload due to additional friction. This suspicion was confirmed by operating the linear actuator independently with a power supply and measuring current draw. The part has been replaced by Thomson PPA90-58B65-08NXXX. Note: this part took over 1 year to arrive since it was first ordered. The spare telemanipulator is confirmed operational.

Update 2024-09-11: noting that this was for serial number 9351

Adam Newsome wrote:

The linear actuator used for the Y-motion motor assistance on the spare telemanipulator was replaced and tested. It was observed around September 2021 that the former one which was installed was causing fuses to blow for the main 120 VAC power supply in the control box. After some troubleshooting, it was determined that the linear actuator itself did not operate smoothly - it was suspected that this caused motor overload due to additional friction. This suspicion was confirmed by operating the linear actuator independently with a power supply and measuring current draw. The part has been replaced by Thomson PPA90-58B65-08NXXX. Note: this part took over 1 year to arrive since it was first ordered. The spare telemanipulator is confirmed operational.

 During this repair it was noted that the Y-axis electrical translation is locked out when the Z-axis is in the fully retracted position (i.e. the Z-axis limit switch engaged). I have made a note of this in the operator manual (CRLD-1046-B Rev1 ) which can be found in docushare collection 26780

Update 2024-09-12: C. Fisher confirms this is actually normal behaviour. The Y-axis motion is inhibited when X and Z are in a certain configuration, which was true when the manipulator was mounted on the wall in storage position. Non-issue. A note about this has been made in the operator manual.

It was observed today that for the spare manipulator (Model N, Serial 9351), the Y-axis motion was not functioning. X motion and Z motion are functioning as expected. Note that the Y-axis linear actuator was recently replaced and successfully tested and has not been used since the replacement (see e-log 2422).

The following information was determined from troubleshooting:

• X motion functioning correctly
• Z motion functioning correctly
• Y motion selection functioning correctly - the indicator light on the operator control box lights up to confirm Y is selected, and the relay on the main control board which selects the Y axis toggles, as expected
• Y motion motor contactors do not function as expected when toggling in either direction. Note that these contactors are shared in common with the other two motion axes, so they are functioning correctly and presumably the motor controller itself is as well, since the other axes work.
• Most likely, because of the above reasons, there is an issue with the inhibit signal that is specific to the Y axis. The inhibit signal which runs from the main control board to the motor control board is shared in common with all motion axes (same for the two direction select signals). It is suspected (not yet confirmed), that the microcontroller is not outputting the inhibit signal as it should be. This is not due to a limit switch related issue because the Y axis does not have limits. Troubleshooting this has been difficult because the schematics do not show the full extent of the circuitry.

Further troubleshooting steps:

1. Check inhibit signal functionality - is it working for Y axis?
2. Check direction control signal functionality - are they working for Y axis?
3. Swap motor select wires to "trick" the microcontroller into thinking it is running a different motor, to further isolate the issue.
4. If required, swap the entire main control board with another manipulator's, to see if the issue is related to the circuitry which is not described in the schematics.

At the time, this issue is not deemed critical because this is a spare unit.

Today (Wednesday July 18th) at around 4:15 pm I was taking a small tour group from VECC into the Target Hall. In the process of discussing the mechanical design of the Target Modules and South Hot Cell turntable I inadvertently lifted the Aluminum Hatch Cover of the Hot Cell about 2 inches in an effort to explain something. This tripped the ventilation alarm before I realized what I was doing. I evacuated the visitors from the Target Hall, checked booties and gloves at the check station before having the visitors step over the boot box. I called operations and let them know what I had done. The Target Hall was locked out and is awaiting a survey for the morning of July 19th before work can proceed.

Today (Wednesday July 18th) at around 4:15 pm I was taking a small tour group from VECC into the Target Hall. In the process of discussing the mechanical design of the Target Modules and South Hot Cell turntable I inadvertently lifted the Aluminum Hatch Cover of the Hot Cell about 2 inches in an effort to explain something. This tripped the ventilation alarm before I realized what I was doing. I evacuated the visitors from the Target Hall, checked booties and gloves at the check station before having the visitors step over the boot box. I called operations and let them know what I had done. The Target Hall was locked out and is awaiting a survey for the morning of July 19th before work can proceed.

At the end of manipulator repair Thursday the ventilation pre-filter in the hot cell was changed. Old filter remains in the hot cell until such time as it can be removed.

I have moved the suspected "hot" items in the hot cell and placed them under some lead bricks. I have re-measured the fields and it has been reducded to 90 uSv\h at the manipulator repair area and 110 uSv/h at the previous 1.82 mSv\h area.

hot items have been moved and shielded as much as possible. Field at left manipulator has been reduced from 560 uSv/h to 85 uSv/h.

The fields in the hot cell have been measured by means of a pole monitor through the tool port. Field was measured to be 25 uSv/h.

The handle cable on the east manipulator of the south hot cell has been replaced. Old cable showed signs of wear but had no broken strands. Manipulator is back together but still needs to be re-tensioned.

Entered hot cell to preform replacement of slave tong cable. Existing cable shows no signs of wear so it has been re-installed. A spare tong cable has been loaded into a spare tong while in the hot cell in preparation for next time this cable needs to be replaced.

Field readings have been taken at the south hot cell in preparation for entry into the cell to fix manipulator.

Field on contact at aluminum cover is 66 uSv/h, and a pole monitor into the cell through the tool port read 297 uSv/h.

 The old TM#2 source tray and TM#4 optics tray have been removed from the vault and placed into the spent target storage on tray 9 which is meant for source trays.

 Two minor chips in the main 60 kV insulators on the source tray was inspected today by Anders, Tom and Aurelia. The chips are small enough that they should not be a problem. See photos for details.