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).

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.

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.

 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.

 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 air hoses for the profile monitor supply line were inspected and no cracking was found (was found on T2).  The quick connect fittings for the bottom air assembly were sticky/corroded and not actuating properly.  Replaced fittings with new parts.

The T1 expansion tank warning level sensor had tripped and the level was approximately 1cm from the base of the tank.  No trip warning was observed when Tom Lyth checked the panels last week.  The T1 cooling package and target monolith were inspected and no water was observed.  Two puddles of water were found in the BL1A tunnel around the T1 package area: one directly below the 1AQ9 Cable Interlock Tray, and another approximately 1.5m to the west.  However, water was observed in the same area when the tunnel was accessed in January.  The T1 volume is currently vented, so there is no indication from the vacuum system as to whether or not water has leaked into the beamline.

The tank was refilled, and the level had not changed after 1 hour.  I will continue to monitor the level.

 The water level in the T1 cooling package expansion tank was checked again today approximately 24 hours after it was refilled.  The level had dropped about 5cm, equating to roughly 3.5L of water lost.

The T1 package was inspected thoroughly and no water was found.  A leak on the target in the beamline is suspected.  The T1 package has been turned off and the water lines were removed from the target.  Tomorrow we will request vacuum group to pump down on the T1 volume which should indicate whether or not there is water in the beam line.

 Vacuum group pumped down on the T1 & T2 volumes (because there is no cold trap on the T1 pump) for approximately 1 hour this morning.  A significant amount of water was found in the base of the cold trap which confirms our suspicions of a water leak on the T1 target.

Tomorrow we will transfer the T1 target from the beam line to the hot cell for inspection, leak checking, and repair.

The T1-MK2 target was transferred from the beam line to the hot cell.  Water was seen in the bottom of the target pipe confirming that the leak is from the target.  The lower cone of the target assembly was submerged in the water and came up dripping wet.  The profile monitor, protect monitor, and two of the target cassettes were also wet.  As it is not possible for those to be submerged, water was likely spraying from either the bellows flanges, or somewhere on the target ladder.  It is estimated that 15L - 20L of water leaked from the target in total.

Inspection, leak checking, and repair on the target will begin next week.  We will suck up as much of the water in the beam line as possible from the top of the monolith using a suction device designed for this purpose.  The remainder will have to be pumped out by vacuum group.

All water was removed from the base of the target hole in the T1 monolith using a suction tube device and wypalls.  Video inspection was performed and revealed standing water in the unused 4" beam line pipe facing south as well as on the bellows on the M13 beam line.  (Photos attached)

Vacuum group is currently pumping down on the T1 volume to remove the remainder of the water.

 The T1-MK1 target was transferred from the storage pit to the beam line.  Services were hooked up and the cooling package was started (operating normally).

Target ladder documentation and elevation values for the new target were delivered to operations.

Vacuum interlock defeat jumpers were removed for T1 and T2.  The interlock was tested by venting the T1 and T2 volumes.  Both packages registered a vacuum trip, however only the T1 package shut off.  A fault report has been filed to investigate this.

Controls group identified that issues with remote actuation of the profile monitor at T2 was due to a short-circuit on limit switch wires on the target assembly.  The relevant wiring assembly was removed from the target and controls group is preparing a replacement.

This morning it was noticed that the warning level indicator for T2 expansion tank displays as tripped on XTPAGE.  The level was checked in the tank and has not moved (is well above the warning level float).  I will investigate further and contact controls group if a solution is not forthcoming.

Controls Group replaced the wiring and wire harness for the profile monitor limit switches on T2.  The monitor was actuated remotely and functioned properly.

The T1 profile monitor was also tested and actuated properly.  The T1 monolith is now ready to be covered so that blocks may be removed from the M20 area.

 The problem with the T2 vacuum interlock was fixed by restarting the "Crate TG1" control panel microprocessor.  The T1 and T2 vacuum interlocks were retested several times and are functioning properly.  Fault report #5907 was returned.

Graham Waters investigated the faulty signal from T2 expansion tank warning level sensor.  The problem was found to be a loose cable at the panels.  The connection was restored and the level sensors are now displaying correctly.

 While working on the leak repair of the T1-MK2 target in the hot cell on Friday April 20th, a cable snapped on the slave end of the right side manipulator.  It is suspected to be the 'Y' shaped cable assembly that actuates the grippers when the lever is pulled on the master end.

The target repair job cannot continue until the manipulator is repaired.  The repair job may take up to a full week, and will require space in the Remote Handling lab as well as use of the house crane, therefore the job will have to be scheduled strategically to avoid interfering with the M20 Q1/Q2 magnet repair which is on critical path and also requires use of the crane.

 Today I noticed a "NOT OK" signal from T2 water expansion tank warning level sensor.  I checked the water level in the tank and confirmed that the water level in the tank had indeed dropped.  The water package is currently not connected to the target so it is not possible for this water to enter the beam line.  

My initial suspicion is that the female Hansen fittings are leaking.  If this is the case, the water will be leaking onto the top of the T2 monolith.  The water lines were disconnected from the target on April 12, 2012 and at that time the expansion tank level was checked and confirmed to be full.   Approximately 7 liters of water has been lost since that time.  If the leak rate is steady this equates to 166mL per day.

I will investigate further on Monday morning.  If the cause of the leak is not obvious, a thorough investigation will have to wait until the M20 front end is covered as radiation levels are high around the T2 monolith and cooling package areas.  The current water level in the expansion tank has been recorded, and will be checked again Monday morning in order to see if the level is still decreasing and at what rate.

 The T2 cooling package, the top of the T2 monolith, and the Hansen water connections which connect the package to the target were inspected and no evidence of a water leak was found.  Kim wipes had been stuffed inside the female Hansen fittings after they were disconnected on April 12th, and these were also completely dry.  I checked with control room and there are no log entries regarding anyone starting the cooling package during the relevant dates.  I also contacted Graham Waters (who sometimes works on the water package controls) and he has not turned on the package since it was shut off on April 12th.

The water level in the expansion tank has not changed since last inspection on May 24th.  I will continue to check the water level daily.

 The west side manipulator was removed from the hot cell using the new manipulator removal frame.  The operation went smoothly and required about one hour with two operators after everything had been prepared.  No contamination was found on the manipulator thru-tube or slave arm.  Only 50cpm were measured on the wrist assembly of the slave end.

 Repair of the west side hot cell manipulator was completed and the manipulator was re-installed into the hot cell.  No contamination was found in the lab, on the manipulator support frame, or on any tools.  A 'y' motion lock was also installed on the east manipulator and all accessible pulleys and rollers were lubricated.