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.

Bevan Moss wrote:

In the AM today David and I used the crane to raise the ground plate sheet metal into place. This afternoon when I attempted to return the crane to its usual place I discovered that the crane no longer worked. Upon further inspection it appears that the PLC has lost power. I will follow up on this Monday morning. The crane is not supporting any load at this point.

 Turns out I am just not very observant. David had turned the main break to the crane off as a result when he turned it back on this morning the crane magically started working again.

In the AM today David and I used the crane to raise the ground plate sheet metal into place. This afternoon when I attempted to return the crane to its usual place I discovered that the crane no longer worked. Upon further inspection it appears that the PLC has lost power. I will follow up on this Monday morning. The crane is not supporting any load at this point.

 TM4 has been moved to ITE and connected there today. I started six turbo pumps this afternoon. One of TP4 back valve (one in pairs) didn’t open .It caused the TP4 difficult to start. I disconnected that control cable that plug to solenoid valve and reconnected it. Then it works fine. After this, TP4 started to normal speed easily. The vacuum readings are OK so far. Tomorrow morning they all should be around 6-7 X E-6 torr range. Water interlock checks related to TM4 have been finished. NO water supply to ITE dump and entrance to keep the system pressure over 90psi. All TM4 water signals are good and strong by watching them from electrical panel. Gas line connected and valves opened. Control page set to fibiad .

TM#4 with UO#3 from the conditioning station to the east target station. Move went well.

Connected leak detector to TM4 and CS vacuum system. The vacuum readings on TM4 and CS:PNG4 3.6 xE-6 Torr, IG1 2.3xE-6torr, IG4(diagnostic box) 3.9xE-6 Torr. Leak detector base pressure:6.0xE-3 torr, base leak rate: 1.0xE-9 atm.cc/sec. Applied 80 psi helium to heat shield circuit for 5 mins . There is no response on leak detector. The heat shield circuit is leak tight.

SiC#27 has been moved from the south hot cell to the spent target vault. Target was placed in pail #96, placed in slot 3A, the fields at the hot cell were 178mSv/hr. For the latest on the vault see attached document.

Electrical check of the target was done at the conditioning station under vacuum, see attached file for details.

TM#4 with UO#3 moved from the south hot cell to the conditioning station. The fields of the module at the hot cell was 74.4 mSv/hr.

Chad and I leak checked the heat shield circuit after uc#3target installed. It took 5minutes to pump down the circuit to the leak detector bottom scales.   All the vacuum lines and connections are leak checked by spraying helium. Chad sprayed helium to each vcr fittings for 2 seconds. There is no any response on leak detector . The test repeated one time and the result is same. The heat shield circuit is leak tight at this stage . We will move TM4 to conditioning station and pressure helium test the circuit.

Electrical check of TM#4 with  UO#3 attached at the south hot cell see attached PDF for full results. It has been noted that the Anode to 60kV common is of a low value after consulting with Friedhelm Ames it was determined will will run with what we have.

TM#4 with SiC#27 moved from the east station to the south hot cell. Fields at East MAA were 127mSv/hr and the fields at the south hot cell was 77.5 mSv/hr.

I disconnected TM4 in ITE this morning. The window circuit and heat shield circuit had been purged. The general field inside ITE is about 200usv/h.

Chad and i did a leak check on TM3 heat shield and window circuits.Both circuits are pumped easily down to the bottom leak rate and base pressure on the leak detector. There are two VCR caps on heat shield circuit. Chad sprayed helium on both of them   ( tested individually,2 seconds every time ) . There is no response on leakdetecor during 45 seconds waiting time. On window circuit there are 2 VCR joints. Chad sprayed helim on these joints(2seconds for each), and no response on leak detector. All joints  are double checked(sprayed twice on each of them). The result is they are leak tight.

and set up ventilation for ITW. ITW is ready for taking proton beam now. All water interlock checks for ITW are done. The ITW water signals strength and frequency had been checked from electrical room, and everything is good.

On Friday, June 22 the following work was carried out.

• Further inspection of the source tray.
• Testing of existing tray removal and installation tool...it works fine, there was just a specific method for proper coupling to the target module. There was no documentation for this tool, so it took a little bit of insight with the drawings and a little trial and error. A document should be written for this tool so its proper use is documented...I will do this.
• Blank-offs installed on heat shield water lines.
• New gaskets installed on window water lines.
• Containment box re-installed.

Pictures can be found at: http://documents.triumf.ca/docushare/dsweb/View/Collection-8639

Here are the pictures from today...there is video too but it is not uploaded yet.

Started refurb of TM3.

Planned activities:

Inspection

Water line blank off

Started 1:00pm

• Video inspection before containment box removed - noticed discoloration on top right (if looking from h/c window) 4" insulator
• Containment box cover removed
• Containment box removed

As I am much older, wiser and handsomer then last time I removed this style of box, I realised there was a better, safer procedure for the removal...I will be updating the doc. accordingly.

End 2:25 pm

TM#3 has been moved from the south west silo to the south hot cell for the start of its second refurb/repair. The fields of the module when it was lowed in was 2msv/hr.

(Copy of e-mail correspondence sent June 20th 2012)

After some discussions this morning I’ve decided on the following best path forward for TM3 at the Hot Cell leading up to the Canada Day long weekend.

General Goals:

-          Blank-off TM3 water line terminations (coil, heat shield, water-cooled window)

-          Test sliding tray removal tool to determine fit on TM3 chassis

We will skip the Conditioning Station leak tests and return TM3 directly to a silo for the following reasons:

-          We will have a visitor next week and this will impact Chad’s time available to do Hot Cell work

-          Helium pressure leak checks on the blanked-off circuits are only one small portion of a large set of diagnostic tests (leak, electrical, HV, etc.) that must ultimately be performed on TM3 to determine its fitness. This full set of tests must be carefully documented in a procedure and executed systematically when there is adequate time at the CS to do all of them, with results recorded.  There is currently not adequate time for this work between now and Canada Day.

-          If we were to detect a leak from one of these tests, it would not tell us anything about where the leak is in that given circuit (there are multiple possible points).  The service cap would have to be opened regardless, which we don’t have time for.

-          The aforementioned bullets above lead me to conclude that the extra work required for two module moves for one set of partial leak checks is not a value-added exercise: In other words, the module will have to go back to the CS, regardless of what we do over the next week for more tests.  The time savings of trying to squeeze it in next week are really negligible and it makes for a tight schedule for not much benefit.

Chad:  Please prepare a detailed work plan for your hot cell jobs including a list of the tools required and what leak checks you will do specifically after you have installed the blank-offs.  You may refer to existing procedures if you already have these written.  I would like to review this plan and I am expecting that an e-log will be filed daily and this work plan should be referred to as an attachment.

Proposed Schedule Jun 20 to 29

Wednesday Jun 20 (1 working day)

-          Setup for TM3 move from Silo to HC (Travis, David)

Thursday Jun 21 (1 working day)

-          TM3 moved from silo to HC (Travis, Don Dale, David)

Friday Jun 22 to Wednesday Jun 27 (4 working days)

-          Chad performs the following HC work on TM3:

·         Removes containment box

·         Installs water-line blank-offs

·         Checks Sliding Tray Removal Tool Fit

-          Vacuum leak checks of blanked-off lines at the HC (Chad, David, VG)

-          Chad buttons up TM3

-          In parallel - David performs block moves as required

Thursday Jun 28 (1 working day)

-          TM3 moved from HC to Silo (Travis, Don Dale, David)

Friday Jun 29 (1 working day)

-          Contingency

RH Group: Please move ahead with the work as outlined above.  Please comment if you have any concerns or proposed changes to this plan.  Thanks very much to all for your assistance,

Grant

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Grant Minor, M.A.Sc., P.Eng.

TRIUMF Remote Handling Group Leader

Nuclear Engineer

4004 Wesbrook Mall, Vancouver

BC, Canada, V6T2A3

gminor@triumf.ca

(604) 222-7359

http://www.triumf.ca/profiles/4557

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