Jan 10, 2024:

The cooling packages for T1/T2 was drained this morning. ~150 L from each of the cooling package reservoirs + expansion tank was drained to the active sump holding tank. The active sump holding tank held ~400 L initially and is therefore now filled to ~700 L (out of a 800 L capacity). We will likely drain the holding tank in the following morning at which point this ELOG will be updated.

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UPDATE (Feb 01, 2024): After recieving instruction from RPG to drain the holding tank to the active sump (due to delays in completing Tritium sample tests), we mistakenly drained ~50L of the 1A holding tank water to the city sewage system (initially it held ~610L and after the draining it read ~580L). This error was caused by misinterpretation of the 1A tank draining systems/procedure. In fact, it is uncommon for RH to pump active water from the 1A holding tank into the sump. It is also unclrear whether a valve configuration to do so exists (if it does, no flow reading can be taken). 

However, because of this error, we learned that the plumbing to the city water drain is slightly blocked (see image).

Our plan of action moving forward will be to wait for the Tritium results and coordinate with RPG to determine the appropriate next steps.

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UPDATE (May 02, 2024): The active sump level was inspected visually on April 29 and it was noticed that it was close to full. 1x 1L and 2x 20mL samples were then collected and passed to RPG for testing. When RPG completes their Tritium analysis, we will drain both the holding tank and the active sump. See this link.

T1-MK1 was moved from the target station to the hot cell roof. 

Radiation surveys report 140 mSv/hr at 0.5m for the bare T1-MK1 target ladder.

On the hot cell roof, fields are 220uSv/h at 0.5m.

T1-MK2 was subsequently transported from the storage pit to the target station. 

After the transport operation, the 1A vacuum volume was then pumped down, and reached approximatley 1/10 of the vacuum level prior to venting.

Update: a few hours after the vacuum volume started pumping down, vacuum levels stabilized to the level observed prior to venting (see image) - confirming that the o-ring seal on the target is good and that the transfer operation was a success. 

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During the transport operation we noticed that the chain drive on the target transfer flask was slipping considerably more when powered through the power bar on the camera stand. 

This issue was remedied by powering the transfer flask through a dedicated plug, and will be noted in procedures for future transport operations.

The resin flask on the T2 cooling package was exchanged today (new resin can prepped in the morning). 

The newly installed resin flask was placed slightly off-set from the marking on the platform to ensure that the braided hose will clear the blocks when replaced at the end of shutdown.

The spent resin can was dropped off in the hot cell, ready to be prepped for drying. 

See attached image for illustration of the rigging solution used, ~20 ft was covered by two sligs and a shackle to clear the MH mezzanine.

 The following tasks were completed in preparation of re-filling the T1 and T2 cooling packages:

1. All valves were returned to the 'open' configuration (note, compressed air to collimators at T1 is to remain closed - rotating collimator no longer in use || also note, odd handle configuration at T1 panel when all valves are open - see attached).
2. Leaks from valves were checked, two leakly valves found at T2 (Swagelok SS-44S6 and SS-45S12), the stem of these valves were re-tightened and leaks were remedied (see picures).
3. Spent CUNO filters in buckets were dealt with: water drained to MH HC active sink, and filters organized into a single 'dry' bucket.

The cooling packages will be filled to 38 cm at the expansion tank tomorrow, and the pumps turned on to check for leaks at pressure, at which point this ELOG will be updated.

UPDATE:

The cooling packages were filled on Jan 16 to ~38 cm, after which both pumps were turned on and a few more leaky valves were identified at the T2 station (none at T1).

We remedied the leaks by tightening their stems and will continue to monitor both systems for a few days.

Besides the leak, we found that the TGT:OUT pressure gage was incorrectly reading 0 psi. We will be entering the 1A tunnels to drain the 1A holding tank soon, at which point we will look to remedy this issue (either a valve was left closed, or an air column is trapped at the gage port).

UPDATE (30 Jan, 2024): TGT:OUT pressure transducer at T1 was successfully replaced and is now reading the correct pressure (see image, ~20 psi is about the same as readings from 2021 when the sensor was working properly).

 The following tasks were completed:

1. Yesterday (Jan 18), the T1/T2 cooling packages were inspected for leaks and some moisture was found underneath the CUNO filters behind the resin cans on both T1/T2. It was determined that the source of the leak was a loose fitting on the drain valves of the CUNO filter housing (see photo). Today we confirmed that no more moisture is found underneath the CUNO filter after these fittings were tightened. A note will be made to keep this in mind for future shutdown operations.
2. The shaft couplings on the T1/T2 target ladder drive system were inspected: no cracks were identified on the rubber couplings.
3. Actuation of the T1/T2 profile monitors were tested. Vacuum levels at T1/T2 remained stable throughout (see picture).
4. The pneumatic connections/hose/fittings for the T1/T2 profile monitors, and M9/M20 BB were inspected - therere were some air leaks out from the ASCO valve + pneumatic flow control valve on the T2 profile monitor when it was in the down/out position. The same leak out of the pneumatic valve by the profile monitor connection was found at T1. Given that both profile monitors actuated properly however, these leaks were determined to not be an issue.

Next week, we will continue work by actuating the M9/M20 BB at T2, at which point this ELOG will be updated.

UPDATE Jan 30, 2024: The M9 and M20 beam blockers were tested, no leaks through the tubing were observed, actuation was quick, ops confirmed no perceptible change in 1A vacuum levels during actuation and EPICS reads correct blocker position signals.

Note: the M20 blocker was actuated by ops, while the M9/T2 blocker was actuated using the ASU on the B2 level of the Meson Hall. The ASU did not require the area to be blocked off to actuate the T2 blocker.

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Note: Ops noted that the profile monitor interlock status has to be reset if a timeout is encountered (such as if the pump were to be turned off or a trip was encountered) before the profile monitor can be actuated (see picture).

Note: When inspecting the system, we tried to open the rotary collimator air supply and the handle on the pannel mounted valve broke off (like it did for the T2 valve last shutdown - see picture). 

UPDATE Jan 30, 2024: The handle to the rotary collimator air supply valve was replaced (see image).

Note: There was also some small leaks at the hose clamps at the T2 profile monitor, in the out position. This leak was however smaller than the leak through the valve. 

The recently removed T1-MK1 target ladder was flushed with city water for ~30s at all target positions. It was then purged with compressed air at ~5 psi for ~1 minute at all target positions. We then left the target ladder in pos5 to fully extend the bellows and allow it to dry overnight.

This ELOG will be updated as we progress with work done to dry the target ladder and eventually exchange the spent targets.

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UPDATE (Feb 02, 2024): in the morning, the target ladder was moved to pos4, and air was allowed to run through the morning, in the afternoon the ladder was moved to pos2 and air was ran. At the end of the day, the ladder was moved to pos 0 and air was ran through over the weekend.

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UPDATE (Feb 05, 2024): the following procedures were completed.

1. the air connections on the target ladder was replaced with the leak test/vacuum connections as per instructions.
2. LN2 was taken from the ISAC-I facility and used to perform two pump-down cycles with the Agilent He leak detector + cold trap.
3. First pumpdown cycle: 3min45sec to go from roughing to fine pumping, left for a total pumpdown time of1hr20mins, a relatively small amount of ice formed on the cold trap cylinder (see image).
4. Second pumpdown cycle: 2min30sec to go from roughing to fine pumping, 4min30sec to reach 1e-3 Torr, 5min to reach < 1e-3 Torr. 
5. Due to good pumpdown in the second cycle, we proceeded with leak testing: Baseling 1.0e-10 Torr-L/sec | ~1 sec He applications at 3.5 Psi directed at fittings/welds/bellows. Worse case measured leak was 0.9e-7 Torr-l/sec in pos 13 of fig 12 of Document 46600 (see taken image for detailed measurements at various locations).

We will prepare an update to the procedure to better log the leak rate measurements and update this ELOG/the procedure. Note that ice removed from second pumpdown was actually comparable to the first (see image, ice knocked off during cold trap removal), but total pumpdown duration (including leak testing) was ~4 hours for the second pumpdown. 

 UPDATE (Feb 13, 2024): see attached record with new template.

 The recently removed resin can from the T2 target station was rinsed with city water and flushed with compressed air for 1 cycle. 

We will run it through a few more cycles before proceeding with drying under the fume extractor, at which point this ELOG will be updated. 

UPDATE (Feb 08, 2024): The T2 resin can underwent 3 more air cycles. Today it was moved under the fume extractor with the lid cracked open and will be left to dry till next shutdown. It is worth noting that some clumps of old resin was found in the secondary resin can which was previously under the fume extractor. This resin should be disposed of alongside the T2 can's resin once dried.