A filter housing and filter were installed by Dan McDonald on November 14 in the piping section between the Remote Handling Hot Cell Lab active sump and the city sewer drain as shown in the attached picture.  The purpose of the new filter is to prevent pieces of active material from being released to the drain when the sump is pumped out.  If small pieces of active material enter the sump they may sink to the bottom, and not be captured in a water sample which is taken from the top of the sump.

The filter housing is a Waterite HP1034CLUR-KIT, and the installed filter is a 10" Cuno Microwynd 25micron filter.

This modification was approved by Curtis Ballard, Joe Mildenberg, and Grant Minor prior to installation.

While the 1A blocks over the T1 area were removed last week the opportunity was used to investigate an air leak on the amplified air system discovered on August 11, 2014.

The leak was found to be coming from a device related to the septum polarity switch located behind (south of) the septum power supply on the 1A blocks.  This device is not in use, so the amplified air to the device was disconnected by plugging the relevant branch of a brass 3/8" Swagelok T fitting in the area.  This stopped the leak, and the air amplifier is cycling at usual speed after being restarted.

Release of the Remote Handling Hot Cell Lab active sump water was completed today by Hua Yang.  During the procedure fields of up to 0.50 micro Sv/hr were measured around the newly installed filter housing.  After completion the filter was removed and replaced.  The filter measured 450cpm on the RM-14 monitor and ~5000cpm on the 44-2 monitor (both on contact).  RPG has been notified and the filter has been bagged, labeled, and left for pick-up by RPG.

 Between Nov 14 ~ Dec 9 the following activities took place:

- The leaky 10mm Be target at pos'n 3 was removed and plugged
- The loose protect monitor electrical conduit was secured in place using an aluminum shim
- David Cameron performed an electrical check on the protect and profile monitors and got the expected response from both
- The target was flushed with water, then air
- The target was pumped down using a cold trap to capture remaining moisture
- The target reached a minimum pressure of 80mTorr on the leak detector Hastings gauge
- Helium leak check revealed a leak at both of the position 1 Swagelok caps (up to 80 on 50x scale on left side, and 100 on 100x scale on right side when facing ladder with 1s spray of 5psi helium)
- The leak rate did not improve with tightening of the caps
- The caps were removed, ladder side threads inspected (no obvious damage observed), and new caps installed
- Helium leak check repeated: Pos'n 1 left side now leak tight, right side leak rate was worse (could not completely open throttle valve on leak detector)
- Torque was increased on the cap with no improvement in leak rate
- The right side cap was removed and when trying a new cap it would not spin freely
- The ladder side threads were inspected more carefully with the Nikon level:  a small dent across the first thread at approximately 2 o'clock position was seen as well as some material build-up or possible galling seen at the 1st and 2nd threads around the 4 o'clock position.
- The threads were filed to improve their profile which allowed a new cap to be installed with light resistance (still would not spin freely)
- Leak check was performed with a minimum pressure of 70mTorr reached (throttle valve fully open, roughing closed), with large response still at the right side pos'n 1 cap, No change with moderate tightening

It is suspected that the ladder side fitting sealing face is damaged causing a poor seal.  When a cap was installed and torqued this may have caused the galling or material build up observed at the 4 o'clock position (but not the dent on the 1st thread at the 2 o'clock position)

Various experts on-site will be consulted about how to best proceed before doing further work.  One option is to perform a static water test.  If the target is water leak tight then it may be used in the beam line.  If repair efforts are not successful and the target is not water leak tight then the target ladder will have to be replaced which is approximately a 2 week job.

The BL1A amplified air system has been shut off, and will remain off until required for BL1A start-up in Spring 2015 (the lower of the two units was in use, with the upper unit on standby as a spare).

This morning at 5:30am the T2 cooling package expansion tank switched to WARNING LEVEL NOT OK.  There was no change in BL1A vacuum at this time.  The change in level was confirmed by inspecting the water level visually.  Operators suggested it may have happened because the cyclotron was shut off and the temperature of all water systems dropped, however T1 did not experience a noticeable change in level, so I do not think this is the cause.  It is possible there is a leak on the cooling system somewhere, but the evidence does not suggest a leak into the vacuum volume.

At 11:55am the BL1A vacuum spiked tripping off both cooling packages.  Valve 1AV8 is closed.  There is no pumping on the T1 volume, so the pressure is slowly increasing.  T2 is at approximately 50mTorr.  Operators believe it may have been caused by work at M15 or M13.  

This appears to be unrelated to the water loss at T2, but proper diagnosis is not possible because Vacuum Group staff are away for the holidays.  The cooling packages will be left off until proper diagnosis can be performed in the new year.

Pumping was restored to 1A today by Vacuum Group and the beam line returned to normal vacuum levels.  Both cooling packages were started with no change in vacuum (no water leaks inside the vacuum volume).  The T2 package was left on for approximately 1 minute, and then the expansion tank level was checked.  Approximately 1cm of water was lost.  The T2 package was turned off, and will remain off until the package can be inspected later this week after block removal.  The T1 package will be left running until T1 MRO work begins.

The T2 cooling package was visually inspected today after blocks were removed.  With the cooling package off the following leaks were observed:

- Collimator A return line ball valve: ~ 2 drops / second
- Collimator B return line ball valve: ~ 1 drop / 3 seconds

The cooling package was then started and the following leaks were observed:

- T2 heat exchanger secondary side, north end ball valve (CuALCW):  ~ 1 drop / sec
- Target water return line ball valve above reservoir: very slow leak, wet but no drips visible

These leaks explain the water found in the tunnel, and the slow drop in T2 expansion tank level.  However it is a little mysterious why four valves all failed around the same time on two different water systems..

The copper active supply to the T2 area will be valved off to stop the leaks, and the valves will be serviced or replaced during this shutdown.

The following tasks have been performed at T1:

- T1 monolith painted using grey two part epoxy paint
- Video inspection taken while package running. Small leak from both valves on H.E. secondary side (video on Isaac's PC, too large to upload)
- Cooling package sampled and drained, drain valve closed
- All reservoir o-rings changed
- All Hansen fitting o-rings changed (4x #6 size, 2x #4 size)
- All three cuno filters and filter housing o-rings changed (used filters 2mSv/hr on contact, temporarily stored on blocks by T1 package)
- Failed T1 P1 (inlet) pressure transducer replaced
- Supply and return valves for T1 CuALCW closed in tunnel to allow leaking valves to be replaced

- New resin can installed at T1 (this note added oct 15 2015 - was previously undocumented)
 

The following tasks have been performed at T2:

- Video inspection taken while package running. Documented leaks mentioned in E-Log #133 (video on Isaac's PC, too large to upload)
- Cooling package sampled and drained, drain valve closed

RPG has analyzed the water samples and given approval for water from both packages to be released.

The T1-MK2 target was transferred from the beam line to the storage pit in hole #5 using the transfer flask.  A maximum field of 7.2mSv/hr was measured at 0.5 meters from the target.  A video was taken while the target was lifted from the monolith and can be found on Isaac's PC (too large to upload).

The blocks to the west and east side of the T1 monolith (level with the monolith) were swiped by Danka Krsmanovic and no contamination was found.  These blocks will therefore not be painted this shutdown.

The three active filters removed from the T1 cooling package have been labelled and stored in the area north of the BL1A blocks boot box with permission from Danka.  The bag with the filters is 100microSv/hr at 0.5m and 2mSv/hr on contact.

The active item discovered on January 9, 2015 outside the BL1A bootbox has been moved to the Meson Hall east hot cell for storage.  The item was analyzed by RPG and the radiation was found to be coming from activated metal contained by dried paint in the bottom of a plastic container.  The solidified paint puck was removed from the container which is not active.  The item is approximately 20microSv/hr at 0.5m, and 1.3mSv/hr on contact.

Both defeats applied to T2 cooling package thermistors were removed today (Col. B interlock was jumpered, and the target water inlet and outlet signals had been swapped).  It was confirmed that all thermistors are now wired correctly.  The readback of both target water thermistors is currently unstable.  Inspection of the Lemo connectors showed that the internal plastic parts of all connectors were damaged or missing.  If the T1/T2 controls upgrade proceeds this shutdown, then all thermistors will be replaced with thermocouples, so after a decision is made on that project (sometime in Feb 2015) these thermistors will either be repaired or replaced.

- Both 3/4" ball valves on the T1 cooling package target water circuit were rebuilt, leak tested with house air pressure, and reinstalled

- The 3/4" ball valve on the T1 heat exchanger secondary side was replaced with a new unit

- The 3/4" needle valve on the T1 heat exchanger secondary side was rebuilt, leak tested with house air pressure, and reinstalled

- The T1 cooling package was refilled and restarted using a bypass across the inlet/outlet Hansen fittings

- The package was inspected while running and no leaks were visible (video survey taken with file stored on Isaac's PC)

- All T1 Cooling Package MRO activities are now complete

- T2-MK2 target (currently in the T2 monolith) purged with air

- All cooling package reservoir o-rings changed
- Target water line #6 Hansen o-rings changed at both ends
- M8 BB / Col. A supply hose Hansen o-rings changed at both ends

- Target water and demin circuit Cuno filters changed
- Used filters double-bagged, labeled, and stored on 1A blocks north of boot box area

- The following Swagelok ball valves removed for service:  Tgt return (X2), Sec return (X2), Demin supply, Demin return (X2), Col A return, Col B return

*** Four #4 Hansen o-rings on package panel still require changing (size was not available from stores)

 The T1-MK1 target is currently in the hot cell for repair of a leak at position 1.  See E-Log #129 for details on previous work.

- Pos'n 1 right nut removed (a little stiff, but no excessive force required)
- Exterior threads cleaned w/ Scotchbrite disc on Dremel tool
- Inside sealing face inspected w/ Nikon level.  Possible brownish material on sealing face at 10 o'clock and 12/1 o'clock positions
- Threads inspected w/ Nikon level: small dent at 1st thread 2 o'clock position as seen before and small amount of material build-up or galling at 1st & 2nd thread 4 o'clock position.  Otherwise threads looked clean and straight
- Constructed Dremel attachment using ~1/2" thick, ~4" long piece of Scotchbrite folded over a 1/16" diameter steel rod, secured with zap-straps and shaped w/ scissors to fit inside the ladder port (see photo)
- Cleaned and polished the sealing surface w/ new Scotchbrite Dremel tool
- Inspected inside sealing surface: brown coloured material no longer visible.  A clear scratch/dent is visible at 10 o'clock position.
- Blew out hole and new nut with compressed air
- Installed nut (went on much easier than before which indicates that the Scotchbrite disc thread cleaning method is effective)
- Leak check performed:  pumped down to ~70mTorr on Hastings gauge w/ throttle valve fully open and roughing valve closed
- Sizeable leak at Pos'n 1 right side nut, as before.  No improvement with tightening

The next step will be to perform a static water test on the cooling lines to see if the plug is water leak tight.  If it is, no further action is necessary.  If not, either the ladder must be replaced, or other methods to achieve a seal investigated.
 

This is a continuation of work detailed in E-Log #129 and #140.

- Static water test performed on the target cooling lines:
     - Test setup assembled and leak checked by pressurising with house air, submerging in water and checking for bubbles (see photos)
     - System filled, pressurized, and valved off on Friday Feb 13 at 5:30pm,  Gauge read 60psi
     - Checked Monday Feb 16 @ 9:00am.  Gauge read 56psi
     - Checked Monday Feb 16 @ 5:00pm.  Gauge read 56psi
     - Checked Tuesday Feb 17 @ 9:30am.  Gauge read 55.5psi  (0.5psi / 24hrs rate)

- Checked results with Dimo and he requested a helium leak check be performed with a newer model leak detector to quantify leak rate:
     - Using Varian 979 leak detector, pumped ~1.5hrs w/ cold trap to remove water
     - TP press: 0.0*10^-4 torr,  Base leak rate ~7.0*10^-9 atm cc / sec
     - Tested all normal leak check locations and did general helium flood with no response at all  (1.5psi helium pressure)
     - Over ~ 20 minute period the base leak rate gradually rose to 8.8*10^-9 atm cc / sec, at one point spiked to high 10^-9 level, then returned to base line
     - Reviewed results with Dimo, he requested test be repeated after the target sits vented overnight

- Target vented and left overnight, leak check repeated Feb 18 starting 9am:
     - 0.0*10^-4 torr TP pressure after ~5 mins
     - 10^-9 atm cc / sec leak rate level after ~20 mins
     - All locations sprayed with 1.5psi helium, general flood in ladder area --> no response (Dimo and Edi present)
     - Target deemed OK for use in beam line by Dimo, he requested the cooling lines be filled with helium after installation in b/l while leak checking T1 volume

- Target will be transported to the storage pit tomorrow (Feb 19) and is ready for use as the spare T1 target

The target had an obvious helium leak when first tested (E-Log #129 and #140), which could not be found when helium leak checking again after the static water test.  Some possible explanations are:  water remaining in the lines blocked the leak path,  water remaining in the lines froze when vacuum was pulled blocking the leak path, having water in the lines caused some corrosion or other deposit which plugged the leak.

The helium leak at plugged position 1 right side measured before the static water test is the same, or slightly less than the leak rate when the target was first removed from the beam line.  There were no T1 vacuum issues during the running period, therefore no issues are expected when this target is put in service again.

- The T1-MK1 target was moved from the hot cell to storage pit hole #3 (ready as T1 spare)

- The T2-MK2 target was moved from the beam line to the hot cell for inspection and in preparation for T2/M9 work this shutdown
- The target measured up to 90mSv/hr at approximately 1m while being lifted
- Beam spots on the target will be measured and recorded to determine ideal offset (if any) for next running period
- A 10mSv/hr collimated field was measured coming from the T2 monolith hole
- An aluminum blank-off was installed over the hole followed by a stack of circular steel discs for shielding which reduced the max field in the area to 700uSv/hr

 Ron Kuramoto, Keith Ng, John McKinnon, and myself spent some time today investigating water and air lines related to the T1 Rotary Collimator (Col. A).  We discovered the following:

- There is a panel on the back (south) side of the T1 cooling package with 3 air lines for Col. A actuation, Col A cooling water supply & return, and the Col. Shield water cooling supply and return
- The air lines coming from the panel were decomissioned in 2003 by Tom Lyth, and at least 2 out of 3 were replaced with CuALCW water from the M13 header in the BL1A tunnel
- Motion / actuation of the rotary collimator was disabled in Oct 1994 and it is now used only in one position
- The two water lines coming from the M13 header (which connect to the actuation cylinder) will be disconnected, capped, and tagged.  The M13 header can then be completely removed
- It is suspected, but not yet 100% confirmed that Col. A and the Collimator Shield are still cooled by the lines passing through the panel at the back of the cooling package
- A flow test will be performed to confirm this, which will also confirm that the Q4 flow meter at the cooling package measures cooling water flow to Col. A

The following work was done today at the T2 cooling package:

- Remainder of #4 Hansen o-rings replaced  (see E-log from Jan 30, 2015)
- Installed the following ball valves which have been rebuilt & tested with 100psi air: target outlet 3/4" (x2), resin can outlet filter isolation 1/2" (x2), heat exchanger secondary side outlet 3/4" (x2), collimator A outlet 3/4", collimator B outlet 3/8"
- Installed the following ball valve which has been tightened & tested with 100psi air (no rebuild kit available): resin supply side 1/2"
- Disassembled the target water inlet thermistor probe assembly to check compatibility with thermocouple probes purchased for T1/T2 controls upgrade
- Misplaced a fitting that the probe inserts through, plugged thermistor port as a temporary measure (the outlet thermistor still functions as machine protection)
- Filled cooling package and opened CuALCW supply and return valves to T2 area in BL1A tunnel
- Started package, inspected for leaks, tightened various Swagelok fittings to stop minor leaks
- Tightened valve stem packing compression nut on Col.A/M8BB shut-off valve and Col B. shut-off valve on cooling package front panel to stop drip leaks from the valve stems
- Inspected again for leaks while cooling package running:  none observed

The T2 cooling package is ready for a interlock response timing test which will be performed tomorrow (part of T1/T2 controls upgrade).
Before the T2 cooling package is ready for operation, the target water inlet thermistor must be reinstalled, and the thermistor connectors must be replaced (if the thermistors are not replaced with thermocouples as part of the controls upgrade)

Total dose:

Isaac - 0.08mSv
Keith - 0.01mSv
 

Elevation measurements of the T2-MK2 target were taken in the hot cell to confirm previous records in preparation for the T2 Protect Monitor adjustment that will take place later this shutdown.  Potentiometer readings were also checked for ladder position 2mm above and below nominal in case we decide to run the target in an offset position again.

Entrance Side:

Ladder moved until potentiometer at 16.19kΩ (nominal position 4)
- Measurement on tape: 1838.7mm

At elevation 1836.7mm: 16.04kΩ
At elevation 1840.7mm: 16.27kΩ

Exit Side:

Ladder moved until potentiometer at 16.19kΩ
- Measurement on tape: 1837.9mm

At elevation 1835.9mm: 16.04kΩ
At elevation 1839.9mm: 16.29kΩ

The elevation measurements at nominal position agree with those taken in May 2014.
The T2-MK2 target is now ready to be returned to the beam line after completion of the M9-T2 work.

Keith C. Ng and Isaac Earle both received .02mSv dose during this procedure.