There was an external water leak in ITW during the last beam running time. The leak started after the shielding blocks transfer(May 22). It cause a constantly water level drop on S-tank(0.5 "/day average). Today , after the blocks are moved , the leak source has been found. Water seeped through a fitting on ITW dump circuit pressure gauge. The leak water slowly flow around the TM1 on the tank flange. most of them are dried out, but left some stain on dump module and tank flange. By closing the supply and return water valves on the ITW dump circuit, the leak is stopped now. We will fix this problem after the module is moved out and the radioactive field is low.  See attachments.

TM#1 with UC#12 has been moved from the west station to the south hot cell.

UCx#12 has been removed from TM1 and placed in a pail with argon.

Right leg (B) of target is clearly broken.

Containment Box cover re-installed and module ready to move.

TM1 was disconnected in ITW  this morning. The ITW was vented with argon last night.

TM#1 has been moved from the south hot cell to the south west silo.

 Thursday, July 09, 2015, 13:17: Water package started.

Thursday, July 09, 2015, 15:20: Water package stopped.

Friday, July 10, 2015, 14:15: Roughing with new pump

TM1 and CS  vacuum system are connected. All turbo-pumps are started. The new TP1S works fine also. The pumping down looks good so far. During the TM1 and CS roughing down time, Joe .M noticed a Rn-220 level surge up in TH . Then,the Rn220  level slowly dropped back. Anders suspected this Rn-220 surging is related to the TM1 roughing down at CS. We decided we will stop the pumps , vent the CS , and roughing  again tomorrow. During the same time Joe will monitor  Rn-220 level in TH to see if the surging is repeatable. We want to learn more on this TH Rn-220 issue.

 The roughing pump was replaced with a more leak tight pump due to the discovery of Rn-220 migration while roughing on TM1 in TCS

TM#1 has been moved back to the south west silo from the conditioning station.

TM#1 has been moved from the south west silo to the south hot cell.

Vacuum leak check on the window line circuit of TM1 took place yesterday and again to confirm this morning. Both days the response to helium is in the area of a soldered reduction fitting at the top of the containment box above and to the shutter side of the extraction column (see attached picture). To verify this morning each joint in the system had a 1 second shot of helium and then timed for 1 minute to wait for a response. This area responded both times tested at about 40 seconds...no response at any of the other locations.

I did a leak check on TM1 window circuit  2 soldering  stems in service cap.The round side panel was opened for the job. I sprayed helium on the stems for 10 seconds. The leak detector got a tiny response(from 0.0xE-9 atm.cc/sec to 2.0xE-9 atm.cc/sec). The test  repeated again. The second time, LD climbed  to 1.2xE-9atm.cc/sec. It looks like there is a very tiny leak on the stems soldering spots. But , this is not the same leak we found from SHC helium spray which LD climbed to 1.4xE-8atm.cc/sec with only one click helium spray by Chad.

 Because of the high air flow at SHC when the round panel is removed, The result is not conclusive. The same test is done at silo without  airflow. We found a big leak on this soldering stems . See later e-log.

Replaced the custom silver gaskets on the entrance window panel of TM1 this morning...this has eliminated an sign of leak at this joint, however there appears to still be a leak somewhere...a good distance from the vcr joints of the window as we are getting a drift response.

Chad sprayed helium to soldering stems in containment box which we suspected with leak last week. With 1second click  on helium, after 80 seconds waiting time , the LD started to show leak up to 3xe-9atm.cc/sec.

Chad sprayed helium close to service tray and vacuum chase. with 1second click on helium , after 30 seconds waiting time, the LD started to show leak up to 2Xe-8 atm.cc/sec.

After this test, we knew the leak is somewhere in service tray or service cap, but not the soldering stems in containment box we suspected before.The further investigation is needed.

TM#1 has been moved from the south hot cell to the north east silo.

 Leak check TM1 window circuit soldering stems inside service cap when module is located at NE silo. LD base LR 0.0xE-9atm.cc/sec.  Only 1 second tiny amount  helium sprayed on stems soldering joints . LD got a quick response to high E-7 atm.cc/sec.Test is repeated again with same result.  See attachments

TM1 and TCS vacuum system have been connected. All turbo-pumps are started. The pumping down is fine.

TM#2 has been moved from the south hot cell to the south west silo and TM#1 was moved from the north east silo to the conditioning station. All done by 10AM.

TM1 water lines helium pressure check at TCS is done. 70 psi helium was applied to water circuits. Leak detector base leak rate 0.0 x E-9 atm.cc/sec, base pressure 0.0 x E-4 torr. The result shows as below:

The results is good so far as we know the window line is leak on stem in service cap. The HS will be tested later with target on.

 The service cap air to vacuum seals also have been checked. The PNG1 panel and side round panel close to shutter are leak. The o-rings on them need to be replaced.

On March 30th -2016, I doubled checked the air to vacuum seal on the TM1 service cap. The side round panel is leak free actually. The PNG1 panel is leak at the bottom side. Confirmed.

On march 31th-2016, The o-ring(1-1/ 2275) on TM1 PNG1 side panel has been replaced today. The o-ring slot and mating surfaces are cleaned, and new  o-ring is installed. The panel is put back to TM1 and all bolts are tightened.

See attachments.

The results of the TM#1 electrical check from the 29th of March 2016

Electrical check of the target on TM#1, target in question is UC#15. See PDF for details.