In preparation for Edi to vent the BL1A vacuum volume, the T1 and T2 cooling packages were both shut off.  They will remain off until vacuum is restored in BL1A in a few weeks time.  This afternoon, water will be purged from the T1 and T2 targets using compressed air so that stagnant water is not sitting in the targets for an extended period of time.

The air amplifier was also shut off and will remain off for the duration of the shutdown.  The lower of the two amplifiers was operating during the last running period.

The suck tube vessel was drained, rinsed, and transported to the active sink area in the Meson Hall Hot Cell Lab.  There are no longer high fields from the suck tube and it is ready for future use.  The filter, tubing, and flange used for filtering the active water were removed and bagged and are currently stored in the south-east corner of the warm cell.  This bag measured up to 12mSv/hr on contact.  There are small black particles visible inside the bag.  The filtered water was sampled and will be released if approved by RPG.  The bucket with the active water is stored in the active sink boot-box area.

Photos attached.

 An electrical check was performed on the T2-MK2 profile monitor by Bill Rawnsley.  All signals produced the expected response, and Bill approved the monitor for use.  Bill has saved screenshots of the signal profile.

The target ladder position micro-switches and profile monitor in/out limit switches were also tested: all OK.

The T2-MK2 target is now ready to be transported to the beam line.

 The leaking 10cm Be target was removed from position 3 on the T2-MK2 target ladder and the water ports were blanked-off with 3/8" Swagelok plugs.  A 10cm Be target remains in position 4.  The target was pumped down using the cold trap and a helium leak check was performed.  All target locations on the ladder were found to be leak tight.  The delta seal locations and fittings above the vacuum flange were also leak tight, however small leaks were discovered at the weld at the lower end of each bellows, details below.

Using the old leak detector in the Meson Hall HC Lab, at baseline level 18 on 10X scale with the target oriented as when installed in the beamline, using 1/2 second application of helium at ~3psi:
East side bellows: response up to 90 on 10X scale, returned to baseline in ~5s
West side bellows: response up to 30 on 50X scale, returned to baseline in ~5s

Based on previous helium leaks of this size it is expected that the bellows are still water leak tight.  Replacement of the bellows will not be considered unless a water leak is found.

After an electrical check is performed on the profile monitor by Probes Group, this target will be returned to the beam line and pumped down to check for water leaks.  If water leak tight, the T2-MK2 target will be used for operation in 2014.
 

Photos are attached of the failed 10cm Be target, as well as the T2-MK2 target assembly with leak locations indicated.

 The T2-MK2 target in the hot cell was flushed with water and then purged with air so that stagnant water is not left sitting in the target.  Replacement of the failed 10cm Be cassette will take place in January 2014.

- T2-MK1 target transported from the storage area by Isaac and Grant and installed at the T2 monolith.  All services were connected.  Storage pit covered.

- Edi began pumping approximately 10am, and was not able to pump below ~20 Torr.  Dimo came in to assist.

- The vacuum interlock was bypassed and the cooling package started to check for water to vacuum leaks:  No change in vacuum.

- Methanol was sprayed around the flange area to look for leaks, and a leak was found on the north edge.  A piece of black rubber was visible and it appeared that the o-ring was out of position and pinched by the flange.

- The beamline was vented, the target lifted approximately 1" w/o using the flask. The rubber was found to be a pad from the storage pit stand-offs that had become stuck on the underside of the T2-MK1 target flange.  This was removed.  The o-ring was in the proper position and undamaged.

- The target was lowered, and pumping restarted.  Only  around 4 Torr was achieved.

- The beam line was vented once more, and the target lifted approximately 6".  Both flanges and the o-ring were cleaned and inspected.  A small amount of dirt or grease was found on the wypall.

- The target was lowered and pumping restarted.  The beam line pumped down at the normal rate.  At approximately 200 mTorr a helium leak check was performed.  The top of the T2 monolith was flooded with helium and there was no response from the leak detector.

- It was observed that the "MONITOR IN" lamp was illuminated on the T2 control panel.  Isaac confirmed that the monitor was fully out and tested the limit switches, no change in lamp status.  Confirmed with control room that they have no warnings or interlocks from T2 that would prevent them from running beam.  It's possible that this lamp has always been illuminated even with the monitor out.

- Plant group began covering the T2 area at approximately 6pm

- The M20 beam blocker was tested after installing cap block, and actuated properly.

- The T2 target ladder was moved from position 0 to position 3 using the portable control box

- T2 expansion tank was topped up to 1/2" above the nut on the warning level sensor

- At 6:30pm 1ACG4 reads 150 mTorr and dropping slowly

T2 target water leak was identified earlier this morning.

Isaac Earle, Ron Kuramoto and Keith Ng co-ordinated Meson Hall blocks removal and target flask transport.

Target assembly was removed from B/L approximately 5pm.

Vacuum "suck tube" (capacity ~ 10L) for removing water in B/L was prepared by Isaac Earle.

Approximately 5 L of water was seen in the bottom of the T2 target ladder vacuum tube enclosure, referenced by the ladder assembly locating spigot (see attached photo).

Most of the water was removed by Grant Minor, Ron Kuramoto, and Keith Ng using the suck tube, job finishing around 8pm November 22nd.

About 1/8" water remains in the bottom of the vacuum tube enclosure, which will have to be left to evaporation overnight and vacuum pumps (see attached photo).

Full suck tube was tagged and left on the north-east side of the Meson Hall blocks near TNF.

Spare target replacement, pump down and block replacement to happen tomorrow, Isaac Earle and Grant Minor to co-ordinate w/ support from Plant Group and Vacuum Group.

 Complete overhaul of all manipulators in the Remote Handling Hot Cell Lab in the Meson Hall was performed by Peter Dudley from Central Research Laboratories between October 28 - November 8th.  Overhaul included replacing all tapes and cables, disassembling, cleaning, lubricating, and rebuilding the master and slave wrist assemblies, adjusting motion locks, and other repairs/maintenance as required.  All 6 manipulator arms in the lab are now fully functional.  Pete reported that some cables from the manipulators in the west side hot cell were showing heavy wear, and cables from the other arms showed mild to moderate wear.

The highest amount of contamination was 1600cpm from a wet wipe on the inner slave boom on the west manipulator in the west hot cell.  Pete received a total dose of 0.10mSv as measured from DRDs worn during this period.

The temporary boot box area in the lab has been disassembled.  No contamination was found on the lab floor, tools, or manipulator removal cart.

 An end-to-end test was performed on the new T1 and T2 high temperature safety switches yesterday during the maintenance day.  The switch set points were lowered below the current temperature and it was confirmed that all warning messages and XTPAGE status changes occurred as expected.

A notification was received that the RH lab active sump level sensor is due for annual inspection.  The sensor was tested and is working properly.

The water level was observed to be only a few inches below the sensor level.  Ken Buckley was notified and someone from his group will sample and drain the tank according to the procedure in Document-64834

 The T2 cooling package was uncovered this morning and a leak was found coming from the Swagelok ball valve on the 3/4" target water outlet line.  The water was coming from the stem of the valve, indicating that water was leaking through the valve packing, rather than at the fittings for the valve.  The leak rate was approximately 1 drop every 5 seconds and a small puddle was visible on the top of the water reservoir.  The water package was drained (samples were taken and given to RPG).  After draining, the valve was replaced with a spare unit.  The cooling package was refilled and restarted.  The package was inspected while running and no visible water leaks were found.  The flow rate through the resin can was adjusted from approximately 1.7 to 1.5 gallons per minute.

 The BL1A tunnel was accessed today to assess a faulty reading from the T1 cooling package inlet pressure transducer (T1P1).  The line was first bled to remove gas bubbles which did not change the reading.  The transducer was replaced with a new unit (OMEGA PX315-100GI).  The pressure reading returned to the usual value of approximately 74psi (faulty reading had been steadily decreasing over the last few months and was at approximately 36psi).

The supply lines for all T1 and T2 pressure transducers in the BL1A tunnel were bled, and the expansion tanks topped up.

This transducer was last replaced in May 2010.

 On September 9th in the morning Ron Kuramoto noticed that the T2 cooling package expansion tank level was reading NOT OK for the warning level.  Looking at XSTRIP showed that the warning level tripped at approximately 1:50am on September 8th.  The tank was refilled at 4pm on September 9th to the usual level (1/2" above the nut on the trip level float).  The expansion tank level will be checked tomorrow and periodically throughout the week to determine if there is a water leak, and if so what the leak rate is.  Note that there has been no significant change in BL1A vacuum, so a water leak into the vacuum volume is not suspected.

 The T1 cooling package inlet pressure (P1) has been dropping since approximately May 5, 2013 from the regular operating pressure of approximately 75psi to the present value of 47psi.  An increase in the rate of decrease started around August 5th as well as increased noise in the signal.  Plots attached below.  No corresponding change in the outlet pressure, and no change in the water flow rate (also no change in inlet and oulet temperatures) leads to the conclusion that the transducer is failing or gas is trapped in the lines leading to the transducers in the BL1A tunnel.

Jamie Cessford and Ron Kuramoto are aware of the situation.  The issue will be addressed during the September mini-shutdown.

 Replacement of the power supply fans for the T1 Power Supply, T2 Power Supply, as well as an additional power supply in rack 1A was completed this morning.  The boxes were blown out with air to remove dirt and dust.  The inside of all boxes were inspected and no evidence of melting or burning was found. 

After installation the output voltage was measured for each power supply using a multimiter on first the DC setting, then on the AC setting to check for fluctuation (as recommended by Erwin Klassen).  Results below: 

T1 Power Supply:  24.2V DC, 0.001V AC 
T2 Power Supply: 23.6V DC, 0.002V AC 
Other Power Supply: 24.2V DC, 0.004V AC 

The fans are all running properly, the power supplies are cool to the touch, and the T1 and T2 cooling packages are up and running. 

 Today (May 31, 2013) I was contacted regarding a burning smell and high temperatures around the T1/T2 controls racks.  Erwin Klassen, Bill Rawnsley, Graham Waters and myself investigated and found that the cooling fans for two power supplies on the T1/T2 control racks had failed and both units were warm to the touch.  The power supplies are labeled "T1 Power Supply" and "T2 Power Supply" in racks 1-F and 1-A respectively.  Bill Rawnsley measured temperatures as high as 90*C inside the power supply boxes using an infrared thermometer.

Small AC fans, supplied by Operations Group, were attached to each power supply behind the failed fans as a temporary measure (see photos).  Large box fans were also placed in front of the racks.  After setting up the fans the exterior of the power supplies were cool to the touch, and temperatures of about 50*C were measured inside the boxes.

The operators are aware of the situation and will check on the power supplies twice a shift over the weekend.  Repairs will be attempted on the next maintenance day.

The T1 and T2 profile monitors were used during today's development shift.  Target ladder movement for T1 was done at the panel on the mezzanine, for T2 the portable control box was used.  Both monitors actuated properly and the scans did not show any "missing" wires.  The profiles at both targets were found to be too broad and were adjusted to span 2 wires horizontally and 6-7 wires vertically (Yi-Nong Rao).

Yesterday (April 18th) the T1 and T2 cooling package PRV outlet lines were routed to the active drain in the 1A tunnel.  All items for the safety and standards compliance upgrade for T1 and T2 as specified in Document-68861 are now complete.

 The T1-MK1 target was leak checked on April 15th at the T1 monolith by Ron Kuramoto and Edi Dalla Valle.  No leaks were found.

The T2-MK2 target was transferred from the storage pit to the beam line yesterday (April 16th).  The field was measured to be approximately 165mSv/hr at 0.5m from the target ladder (after approximately 5 months of cool down time).  Vacuum was started this morning and has pumped down normally (1ACG4 at 11mTorr after ~5 hours) indicating that the target is leak tight.  

The T2 profile monitor and protect monitor were 'blip' tested by Bill Rawnsley and Mike Russel from the racks on the Meson Hall mezzanine today.  The response from both monitors appeared normal.

T2 profile monitor and M20 beam blocker actuation were tested from the MCR, both devices actuated smoothly and all limit switches registered properly.

The T2 target is now ready for beam and the T2 monolith may be covered.