The faulty air pressure supply check valve for M9BB, M20BB, and T2 Profile Monitor was replaced.

The rotor, shaft, and o-ring were replaced on the Q4 flow transducer to address erroneous readout that began last week.
The attached plot shows the flow readout before failure, during the failed state, and after repair.

 The following work was performed on the T1 cooling package:

- New filter housing installed for Col. A filter.  The new housing has a drain valve to prevent water spills during future filter changes.
- Ball valve installed upstream of Col. A filter to allow proper isolation of filter during filter changes.

The following work was performed on the T2 cooling package:

- After further investigation it was confirmed that the air-line noise discovered last week was being caused by a fault check valve.  A new valve will be ordered and installed.
- The M20BB air supply Asco valve was rebuilt to fix an air leak.
- The backing plate, paddle-wheel, shaft, and o-ring for Q2 Proteus meter were replaced.  (fixed fluctuating read-out)
- Replaced 90 micron Nupro filter on the demin. line to address low flow issue (flow increased from 1.15gpm to 2.50gpm)
- Replaced Inlet Pressure Transducer (P1) in BL1A tunnel  (fixed fluctuating read-out)

 

The following work was performed at the T2 monolith:

- Signals were checked to confirm proper micro-switch actuation for M9 and M20 beam blockers (all ok)
* When M20BB is actuated a slight creaking or squeaking noise is heard during one part of the travel.  The main shaft and air cylinder shafts were lubricated, but there was no change.   (this is not thought to be a serious issue, and won't be addressed at this time)
- Replaced o-rings on the upper 1-way metering valve for the profile monitor air supply (fixed air leak)
- Replaced all sections of pneumatic hose for top and bottom supply lines to the profile monitor (old line was cracking)
- Checked actuation of profile monitor by powering 4-way Asco valve at cooling package (traveled smoothly)
* Control room was unable actuate the profile monitor remotely, Brian Minato will be notified of this issue
* The "monitor out" display does not show in the control room when the profile monitor is in the out position.  The micro switches were checked and seem fine.

While checking operation of the M9 and M20 beam blockers earlier this week, a strange noise was noticed coming from the T2 cooling package area.  It is a squealing sound that starts when M9BB, M20BB, or T2 profile monitor are actuated and continues for approximately 30 seconds, then stops.  The source was eventually narrowed down to somewhere on the air supply line coming from the air amplifiers on the south mezanine.  When the air amplifiers are adjusted below ~95psi, the noise stops (the standard setting is 110psi).  A 20psi Nupro check valve on the line was suspected to be causing the noise.  It was removed, rebuilt, and reinstalled, but there was no improvement.

A few of the blocks directly east of the T2 cooling package must be removed so we can have access to the lines in that area.  We will continue our investigation next week.

Replaced all o-rings and filters on the T1 cooling package.  Replaced resin can.  Refilled package and restarted. 
Can inlet resistivity at 9.8MΩ *cm, outlet at 11.5MΩ*cm after approximately 3.5 hours.

(Collimator A filter and modified filter housing to be installed at a later date)

M9 beam blocker returned to beam line.

T2 target disconnected, picked up using flask, and returned to beam line as training exercise.
Field @ 50cm from T2 target during removal:  ~90,000μSv/hr

Resin can flask with new resin moved from hot cell lab to T1 cooling package area.

M20 beam blocker was transferred from the hot cell to the beam line.
M9 beam blocker was transferred from the beam line to the hot cell.

Field at 50cm from M9 beam blocker during removal: 5000μSv/hr
Field above M9BB hole on monolith after removal: 3500μSv/hr

Unlike M20BB, M9BB has an unmodified lower shielding plate, and no plastic bushing.

The replacement shaft bearing was machined by Maico Dalla Valle and installed in the beam blocker.  Smooth operation of the beam blocker air cylinders was confirmed, and the beam blocker is scheduled to be re-installed in the T2 monolith on Monday morning (Jan 23).

 The broken M20 beam blocker plastic shaft bearing was removed.  Measurements of the bearing as well as the shielding disc (for which drawings can't be found) were taken inside the hot cell and a brass replacement bearing has been designed based on these measurements.

Photos of the removed bearing, measured dimensions of bearing and shielding disc, and a PDF drawing of the new design are attached.

 While wrapping up vacuum seal bearing replacement on the M20 beam blocker I found a piece of hard black material approximately 3x1x1cm on top of the hot cell turntable.   Checked for contamination and found 480,000cpm on the Ludlum 44-2 probe, and off scale on the pancake monitor.  This piece fell from the transport flask when it was opened above the hot cell after picking up the M20 beam blocker.  Upon further inspection, more pieces were found inside the hot cell on the table.  RPG was notified and currently has the sample for further testing.

 Replaced M20 beam blocker vacuum seal o-rings.  Old o-rings were noticeably harder, but not brittle or cracked.  Applied "Haskel Dry Air Seal" lubricant to air cylinder shafts and "Apiezon M Grease" to vacuum seal o-rings and main shaft.  Took approximately 1 full days work.  Total dose: 0.08mSv.

Uncovered T2 monolith and transferred M20BB to hot cell using flask.

Field at 0.5m from beam blocker while being lifted with flask: 21,700μSv/hr (using pole monitor) 

Field above hole after removing M20BB: 9000μSv/hr

 Defeated T1 and T2 cooling package vacuum interlocks at 1-C panel on South mezzanine in Meson Hall to allow cooling packages to continue running after beamlines are vented.

Notified operations.

Drained T2 cooling package water, collected sample and delivered to RPG.  Swapped resin can, refilled, and restarted cooling package.

After 6 hours can inlet at 10.3MΩ *cm, can outlet at 10.5MΩ*cm electrical resistivity.

 T1-MK1 target transferred from hot cell to storage pit position #3 to free up the hot cell in preparation for shut-down activities.

Current device locations in storage pit:

Pos 1: TNF Resin Can
Pos 2:    empty
Pos 3:  T1-MK1 Target
Pos 4:  T2-MK1 Target
Pos 5:     empty 
Pos 6:     empty 
Pos 7:     empty 
Pos 8:     empty 
Pos 9:     empty 
Pos 10:   empty 
Pos 11:   empty 
Pos 12:  Liquid Deuterium Target
Pos 13:  Kaon Target
 

Replaced T1-MK1 target ladder with the new ladder design which has an integrated upper slide plate (2 less sealing locations) and no c-seal grooves.  C-seals replaced with aliuminum delta seals.Transfered all target cassettes to new ladder in the same positions.  Performed helium leak check at interface with bellows flanges and all cassette locations.  No leaks detected.

Target still requires installation of new protect monitor.  Beam-spot and elevations procedure must still be performed.

  Moved Kaon Target from storage pit to remote handling hot cell using flask as training exercise.  Safety surveyor scanned storage pit area (wide flanges: clean,  pit floor: 50cpm).  Returned flask to hot cell lab floor and covered storage pit.

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