TCS:TK2 , Water has been refilled to 28.5" level. It was 15.1". Fall protection equipment  are used during the job.

HALCW resin tank has been replaced. The old tank is stored in middle-west silo now. The field on old resin tank bottom is about 3.5 msv/ hr(on contact). By shielding it into silo and putting two lead blankets on the top cover of the silo,The general field 1 feet above this silo is 25usv/hr. And, The field around the silo area are less affected. This old tank will stay there as long as possible.  For the new resin tank during preparation, It was found that on return line side, the 1.25" pipe thread plug with return line tube  was very difficult to be installed onto the female thread adapter which is welded onto to tank body. It was jammed in half way of threading onto tank at manufacturer. This plug was removed out first and inspected. The first and second male threads were galled.  Maico repaired the thread on a lathe. The female thread on the tank was tapped. A tight spot was found during the tap. After that, the return line plug could be installed onto the tank properly.  The new tank was installed into the vessel and connected back to HALCW system. Water are refilled into new tank. During refill air were trapped into the system. This caused  pump restarting problem. By Several times of starting up the pump, stopping the pump and venting,  Most air were breathed out of  system. Finally,The system was restarted by supply water to ITW( without module) only. ITE and resin can circuits were brought back to system after that without problem.

 Before removing the old tank, We drained water out of old tank to decay tank. Since the resin tank is largely filled with  resin, and water are soaked into resin, we only can drain out less than 10 liters water out of tank. Also, The drain caused some part of return line on pumps have to been drained. This is the main reason air was trapped in system during the new resin tank water refilling. For the future replacement, we should not drain water in old tank. It does not worth to do it. 

Attach TH HALCW resin tank replacement procedure here.

2022-02-17 reload replacement procedure and draining schematic.

Leaking seals on ITW HALCW 2" return line ball valve have been replaced. 8 liter waters are drained out for this job. Water are drained into a thick plastic bag.  The bag is tie strapped , labeled, and put into a yellow garbage bin in MAA. Water sample is given to RPG. After analyzing, RPG will give instruction on how to deal with it. Since we just refilled NALCW to system before this job, the active level on sample is very low. We may dump them into active sump.  After seals change, The system is refilled . I started pump and set everything back to normal configuration. NO leak has been found on new seals. The HALCW system is operating good so far.

It is closed @ 2:35PM by closing supply side valve first , the return side valve of ITE dump plug .

Opened ITE dump plug circuit valves @4:28PM. ITE IG1S still at 1XE-6. No change before and after of circuit closing and reopeneing.

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.

I watched rust on TM4 and its silo. Most of rust are on est side of module and silo. See attachments

Yasmine and I did a rust inpsection on TM4 service cap inide surface and shielding plug surface. No rust has been found. Also, all steel bolts on this surface look fine. The inside of silo held this module are rust free as well.  See attachments

TM4 service cap rust are cleaned out at TCS. All top surface of TM4 are wiped and cleaned . The module looks good now. see attachments

ITE clean up is done.  HV cage inside is wiped.

Rust on S/W silo and cover plate stored at silo area are cleaned up.

A small leak has been found on TM4 Ta(-) which is marked as "B" on terminal blocks. The LD base Leak rate is 1.2XE-8 atm.cc/sec. 70psi helium has been applied to Ta(-) water line for 3minutes. The leak rate went up to 2.5xE-6 atm.cc/sec and stabilized there. Anders found a helium response on RGA helium reading during the same time. This confirms the leak is real. Other lines are leak checked today also. They are good still. All TM4 water lines were leak checked in ITE in 2017 January. They  were all good at 0.0 X E-9 atm.cc/sec. See attachment e-log.

Leak check on TM4 Ta(-) water lines in service cap is done. LD base LR after 50minutes pumping down:0.0xE-9 atm.cc/sec. base pressure: 0.0XE-4 torr. I sprayed lots helium on welding stems on Ta(-) line in service cap including stems in blue nylon insulator and stems to service tray.  no any response has been foun on LD. The Ta(-) line in service cap is leak free.

 Totally panel open and leak check time is about 12minutes. Argon vented TCS before leak check this morning. 

This morning, The helium pressure leak check on TM4 Ta(-) is done after TM4 finished conditioning yesterday.  LD base LR:8.0XE-9 atm.cc/sec, base pressure: 0.0XE-4 torr. Applied 70 psi helium to TM4 TA(-) water line. The LR slowly climbed to 2.2XE-7 atm.cc/sec, and stopped there. Waited for 5 minutes and change at 2.2 X E-7 atm.cc/sec.

 Argon vented TCS and TM4 after pumps are stopped.

Today, I checked TH crane main hoist  when shielding plug is installed into ITE pit. I did  some jogging actions on main hoist during the operation. Everything looks fine. No burning smell, no strange noise. An outside crane expert suggest that jogging is the worst working situation for crane. We have to use jogging actions during our crane operation. But, we could try to use less jogging when operate the crane.

all turbo-pumps are started. Everything looks fine so far.

ITE target module tank flange o-ring was replaced yesterday before TM4 moving. ITE: IG1S reading looks fine so far. 

I started two turbo-pumps on TM1 and one small TP on TCS. They are work fine. 

TM1 inside service cap surface and shielding plug surface are visually inspected yesterday. No rust has been found. I cleaned all rust on top of TM1  today.  Rust on TM1 silo  top plate are cleaned as well.

Chad and I did leak check on TM1 HS line at SHC. 0.0XE-9 atm.cc/sec.  No leak.