I did a vacuum leak check on all ITE primary vacuum vessel and secondary vessel.I also did a helium pressure test(80psi ) on all TM4 water lines. There is no leak has been found.ITE and TM4 are both leak tight now.

ITE primary vacuum vessel and TM4 waterlines:

Hooked leak detector after TP1 between BV1. leak detector base pressure :0.0xe-4 torr. base leak rate:1.8x e-8 atm.cc/sec.sprayed helium around all TM4 and exit 1 ,2 module primary vessel including all flanges,  gauges, bellows,turbos,blank offs,etcThere is no  any response  on leak detector. All water lines  had been pressurized with 80 psi helium  for 5 minutes. The leak rate always stayed at 1.8xe-8 atm.cc/sec which is the base leak rate  on ITE this time, and no vacuum pressure change also.The TM4  water lines and ITE primary vacuum vessel are leak tight.

ITE secondary vacuum vessel:

Hooked leak detector after TP1S between BV1S. Leak detector base pressure :0.0xe-4 torr.Base leak rate:0.0xe-9 atm.cc/sec. Sprayed helium around all TM4,EXIt 1,2  module secondary vessel including alll flanges,gauges, air cylinders , valves, and blank-offs.There is no any response on leak detector . tThe late rate  kept at 0.0XE-9 ATM.CC/SEC, and no pressure change either.The ITE secondary vacuum vessel is leak tight.

ITE and ITW water system paddle wheels and coils on all flow sensors in pits have been replaced. It's a SAS job.

ITE TP4S was broken down last night . I stopped the ITE pumps and vented station with Argon this morning. Edi and I replaced the broken pump with a new pump. The ITE is under roughing now.

Tony and I replaced the ITE TP4 turbo pump today. The pumping time on controller has been reset to 0. The replaced broken  pump is bagged and stored at west end of TH.

ITE TP3 is replaced. ITE is under vacuum again. All turbo pumps are started successfully. Current draw on pumps are normal so far.

ITE TM3, entrance module, and 2A3 window flange seals have been leak checked this morning after 2 new seals replacement.The LD base leak rate was 0.0xE-9 atm.cc/sec,  base pressure was 0.0 XE-4 Torr. I sprayed lots helium around the TM3, entrance module and 2A3 flange seals. No any response had been found on LD during the  spraying. All three flanges are sealed perfectly now.

ITE MSP water circuit flow wheel was replaced yesterday due to poor performance.

By retrieving data further, It has been found no directly relationship between IG1S surging and dump plug water opening. Vacuum surging is 10minutes ahead dump water supply to circuit. SEE attachment 1. Also, The ITE IG1S start to behavior unusual in middle of Feburary. See attachment 2. Today,  ITE IG1S is still slowly climbing up. I decide to leak check ITE vacuum vessel. Before  leak check, for more information and trouble shooting. I closed water supply to ITE to see if vacuum has response on it. I will return water supply to ITE  tomorrow morning.

Water supply to ITE is returned this afternoon at 2: 10 PM.  Everything works fine so far

I leak checked ITE secondary vessel vacuum. A leak have been found in March 09th noon which is located between entrance module and TM2 top tank flange o-ring seal( on tank flange). It could not be confirm on which side of the o-ring the leak is from.

During last night, ITE IG1S reading went back to normal low E-7 range and stays in this range now. So I leak checked same area again this morning. The leak disappeared now. The o-ring works sometime , but not all the time. The plan for this issue: Change ITE target module side o-ring when TM2 is move out., and watch on the ITE IG1s when TM4 is moved back to ITE and pumped down.

ITE IG1S cable end connector replacement has been finished by Roy Huang.

The blocks above the pre-separator section of the ISAC beam lines were removed today in the Target Hall by Bevan Moss and Chad Fisher with Lynne LeMessurier present from RPG.

The two blocks in the layer below the top layer above the pre-separator were damaged on removal (see attached photos).  This was due to an attempt to lift them in the incorrect sequence caused by misinterpretation of the labeling / numbering system drawn on the top of the blocks.  The blocks are labelled for the replacement sequence, but not for the removal sequence.  An attempt was made to lift a block that had an overlap with an adjacent block that was not visible, causing damage to two blocks.  A note was added in black marker to the critical block to indicate that it should be removed last (shown in attached photo).  The block replacement sequence will be photographed and a procedure document will be written by Bevan, with a bound copy of the procedure provided in the Target Hall, in order to prevent such an incident from occurring again.  Broken pieces of the blocks were collected and placed in a 5-gallon pail.

The removal of all of the blocks caused the depression in the target station to fluctuate around the trip point (17 inches of water column), which caused the ventilation alarm to trip on and off constantly.  Operations contacted me to ask if this could be remedied.  Bevan closed the damper to ITW, which brought the depression to a low enough value so that the alarm could be defeated properly.  This was around 2pm.

Preliminary co-ordination of the ITE Harp 9 removal job was discussed by Scott Kellogg and Ron Kuramoto around lunch time.  Keith Ng (RH) and Scott searched for the blank-off that was used during the last Harp 9 repair (removed from B/L in March 2013) but they could not locate it.  I was later able to find the blank-off bagged in a grey rubbermaid bin at the bottom of the stairs in the target storage vault pit (under the SHC / NHC ventilation and filters).  The blank-off was found bagged and tagged as surveyed at 100 counts @ 0.5m on March 27, 2013.  I gathered Scott, Ron Kuramoto, and Danka Krsmanovic to co-ordinate the Harp 9 removal and blank-off installation, starting at around 2:30 pm.

For the Target Hall Harp work, Ron Kuramoto and Scott prepared the required tools and plastic coverings / bags.  I acted as crane operator.  Danka was the surveyor present.  Anders Mjos joined the group for photos and moral support.

Scott disconnected services from the Harp device, and prepared it for lift.  I called operations to confirm that the section of B/L had been vented.  Ron and Scott used the RH tools to disconnect the 2 vacuum flange bullet bolts.  Ron directed the crane with signals and I lowered the chain rigging to the Harp, it was connected and removed from the BL with the main hoist.  (I made the mistake of directing the rigging of the harp to the main 20T hoist, when in fact the 3T Aux hoist should have been used, as the main hoist can't reach to the vacuum / storage pit on the west side of the hall.)

Danka performed several swipes and measurements of the Harp after removal.  Alpha contamination was discovered on the bottom of the Harp flange.

Ron and Scott installed the blank-off flange, then I called operations to indicate that pumping should start.

Ron and Scott retrieved the vacuum test flask jig / support structure from the West storage pit and brought it down to the pre-separator pit.  I lowered the Harp into this flask jig, and Scott used the side-wall location bolts from the top of the harp assembly to fasten the flanges of the Harp and the jig.

I had trouble at first activating the Aux hoist but soon realized that it's necessary to press the Aux pendant "ON" button down for several seconds before the power actually turns on to this hoist.

We then removed the main hoist hook and attached the Aux hoist to the Harp / flask.  The assembly was transported to the West storage pit.

Some of the handrails had to be removed to facilitate initial movements of the Harp assembly.  These handrails should be replaced tomorrow morning.

Scott also submitted a Work Order for a back-up blank-off today, job number 40303.

The pre-separator blocks have NOT been replaced yet, we will do this tomorrow morning.

It was a busy day, thanks to all for their efforts and for staying a bit late to get the blank-off installed.

Best regards,

Grant

ITE annual HV test is done. No module in station. The bias power supply has been ramped up to 49KV on control page. We still have voltage limit issue on this PS at 48KV so it only can go to 47.7 KV on PS panel. No major spark during test.. The test result is same as last year test which was did in March 2020. 

Carla did the test. That is what she wrote in Feb 04th:  "I am done with the HV testing at ITE - the results were the same as at ITW. It stayed at 59kV for 30 mins with no issues. Trying to go above 59.5kV is probably possible but a bit more risky. ITE also has a band, from 54-56kV, where the current jumps around like crazy".

ITE bias test is done to 48KV. No spark. We can not raise bias above 48KV. It looks like we have a current limit issue on control system when testing above 48KV.  John Cow checked current limit on PS locally. It is set to 8mA which is much higher than the test current. Isac operator issued an e-fault to control group.  

 John Chow did a local test on PS. Everything works fine.The problem is on control system. We have a 48KV voltage limit problem on control system. We decide to end the test now. 48KV is good enough before this year mini-shut down. 

Wednesday, February 05, 2025, 12:20

• Ed has the voltage already up to 1000 V. Starting further ramp up in 250 V increments.

Wednesday, February 05, 2025, 12:45

• Current was quite stable with basically no noise, and increasing with voltage until 57.5 kV, when the current spiked from 180 uA to a peak of 308 uA and the voltage dropped a little bit for a single data point. Kept it here for a few second and then dropped it back down a couple steps. Currently at 57 kV and the average current is about the same as before (181 uA), but the noise is significantly higher (+/- 10 uA).
• Been at 57 kV for about 5 minutes and no change in the noise. Will try continuing ramp.
• 57.25 kV: Current is ~193 uA with +/- 20 uA noise.
• Gonna go with 250 V step every 5 minutes from here on until 60 kV.

Wednesday, February 05, 2025, 13:17

• Seemed like it was having some trouble at 58 kV, and then at 58.25 kV it was fine for about a minute and just starting sparking constantly, and would not calm down after a minute. Some sparks caused a positive voltage swing up to 65 kV, and with currents as high as ~4000 uA.
• Ramped voltage down in steps back to 56.75 kV. It's still getting about 10-11 sparks per 5 minutes.
• Trying 56.5 kV. 8 sparks in 5 minutes, one positive.
• Trying 56.25 kV. 3 very small voltage drops in 5 minutes.
• Trying 56 kV. No voltage drops in 5 minutes. Current is on average ~204 uA, with +/- 20 uA of noise.

Wednesday, February 05, 2025, 15:02

• 1.5 hours at 56 kV. 2 small sparks over this time. Current was about 195 uA on average with about +/- 20 uA of noise. A spark will usually result in a change of the average current following the spark until the next.
• Ramping down voltage now. The amount of noise decreases quickly with voltage and is basically gone at 53 kV.
• Power supply off.
• Dumped data to https://isacwserv.triumf.ca/onlylocal/isacdata/ITE_HV_test_shutdown2025.txt

Conclusion: ITE seems good up to 56 kV.

ITE TP3,4, 1S,and 4S were started successfully this afternoon. All pump current draws  were below 1.5A . IG1S was switched on. I have no local controller so TP1 and TP2 on TM4 at  MSP can not be checked.  IG1S was hard to switch on at first. It timed out and showed error 09 code. I removed the connector back cap, and it could be switched on after. I will look on this issue. 

Turbo -pumps were stopped  last night at  6 pm. All four pumps worked good during check. For IG1S switching on issue, the problem either caused by over pressure(No TP1, 2 in ITE)   or because coaxial cable was pinched by connector cap and caused bad contact on pin to cable.   I modified the connector cap inside by opening more space for cable passing through the cap. The cap is installed back.   The gauge will be switched on next week again. We keep watch on it

A fully built steerer sub assembly ITA2826 revision E was boxed and sealed and put on rack storage in ISAC B2 South Hot Cell area. It is contained in a blue bin and green tag. 

It is advised if this assembly is used, it should be inspected for damage before using in a source tray.

The 4" PVC drain line in the ISAC-1 active sump was modified so that the drain pipe terminates below the low level water line of the automatic pump-out system.  This will prevent backflow of sump gasses into the SHC, NHC, or TCS space if the air pressure in any of those rooms are lower than the sump air pressure.  The details of the modification were specified by Mechanical Services Group, and the work was done by Paul Jensen.  This system is defined in drawing IAM19183.

Below is a report on the ISAC Target Hall crane brake issue observed yesterday and addressed today:

- On April 13^th, both the East and West hoist brake assemblies were replaced by Gordon Crane & Hoist, after David observed a burning smell

- The East assembly was replaced with a completely new brake assembly from Kone crane

- The West assembly was replaced with a refurbished assembly, which used the East assembly housing fitted with a rebuild kit by Gordon Crane

- Yesterday while preparing TM3 for a lift, David noticed a vibration / rattle sound coming from the West hoist brake

- This issue was only observed when starting the hoist from a complete stop, at the slowest possible upwards hoist speed

- Once the hoist speed increased, the sound went away, even after returning to a slower speed

- Tom from Gordon Crane & Hoist came in this morning at 7am and replaced the new West assembly with the original West assembly, which had at that point also been fitted with a rebuild kit at Gordon Crane’s shop

- Tom also inspected the East brake assembly again

- Tom commented that he had issues setting the right gap between the friction plates and the brake rotor – too close and the brake would not release properly, too far and the brake rattle issue would be observed

- He also commented that during this most recent repair of the West brake, he applied never seize to the shaft and spline to ensure that this friction point was not an issue

- After Tom finished his repair and inspection of the brakes, David attempted a test lift of an SEG block (10 ton) at the slowest lift speed

- The rattle noise coming from the West brake was still observed

- Travis also tested the slowest speed in Remote Test mode from the control room, with David and Grant present in the Target Hall, the rattle was also still observed

- Tom advised that the rattle would not affect the safety of the hoist, and no damage would be done to the brake assemblies by running the hoist normally with the rattle noise

- Tom ensured that he would consult with Aiden and they would likely order a brand new West brake assembly from Kone

- Tom called Aiden Gordon to confirm that it was ok to proceed

- Aiden called me around 1:30pm and left a message that the slow speed rattle sound was benign and that we could proceed with normal operations, but he would definitely address the problem moving forward, and we should standby for his report

Photos and video have been uploaded to Docushare.  The hoist noise before the repair and after the repair during the test lifts can be heard in the videos.

https://documents.triumf.ca/docushare/dsweb/View/Collection-19812

Thanks and regards,

Grant

--

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

The ISAC Target Hall Crane was load tested and re-certified in January 2011 prior to doing a near-capacity lift for the North Hot Cell roof structure (IRH1112E).

Photos and documentation from Norelco is attached.

- Grant