 Thursday, September 06, 2018, 13:49, Isaac Earle, Repair, Target 1, Cooling, T1 cooling package secondary side solenoid failed
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On Friday Aug 31 at approximately 3am T1CS:FGSEC dropped to 0gpm flow. This was confirmed to be a real reading when T1CS temperatures continued
to rise steadily. Beam was turned off, and T1CS later turned off by operators (temps continued to rise due to heat from pump). The cooling
package was uncovered in the morning, and the T1CS:SVSEC solenoid was replaced by Doug Preddy and Keith Ng. This solved the problem and the package |
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Tuesday, August 28, 2018, 11:16, Isaac Earle, Standard Operation, Other, Other, South TNF Holding Tank water released
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The water in the South TNF Holding Tank was released today under work permit #C2018-08-28-3. The tank contained approximately 100L from the
T1 cooling package (drained Aug 16, 2018) and 350L from the 500MeV system (drained April 23, 2018 by Steve Sapriken). |
Thursday, August 23, 2018, 11:52, Isaac Earle, Repair, Target 1, Cooling, T1 cooling package pump failure and replacement 
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On Wednesday August 15th the T1 cooling package tripped off, and could not be restarted. On the EPICS screen the pump device went into an immediate
time-out each time we attempted to turn it on. An electrician was involved in the debugging, and issues were found with the 480V supply. The
breaker switch in the 480V supply panel was found to be damaged, and was replaced. The relay in the contactor box for the pump motor thermal protection |
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Monday, July 23, 2018, 09:39, Isaac Earle, Repair, Target 1, Cooling, T1 collimator solenoid valve failed - Solenoid replaced
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On Saturday July 21st the T1 Collimator solenoid valve would not re-open after tripping closed due to a (planned) loss of vacuum. Shielding was
removed and the valve solenoid was replaced which fixed the problem. The original valve body was left in place.
This is the second time the solenoid at this location failed (See E-Log #239), and the latest of several failures of these new 24VDC solenoids |
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Tuesday, July 03, 2018, 11:09, Isaac Earle, Repair, Target 1, Cooling, T1 cooling package outlet water pressure sensor replaced
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The T1 cooling package outlet water pressure sensor (B1A:T1CS:PGOUT) was replaced this morning with a new unit. Over the last few months
the sensor readout had been steadily decreasing (from around 20psi to 4psi) with no corresponding decrease in inlet pressure, and no change in the circuit
flowrate (this is how these pressure sensors typically fail). |
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Friday, June 01, 2018, 17:50, Isaac Earle, Repair, Target 1, Cooling, T1 collimator solenoid valve coil replaced
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Flow stopped through the T1 collimator cooling loop around the same time as a power bump this afternoon. The problem was narrowed down to failed
solenoid valve B1A:T1:SVCOL by comparing coil resistance to other units without issue (~1.0ohm vs 3.6ohm for working units), measured at the T1/T2 PLC
cabinet. Shielding above the T1 package was removed and the solenoid coil was replaced with a new unit. After replacement the valve works as |
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Thursday, May 10, 2018, 15:23, Isaac Earle, Repair, Target 1, Target, T1-MK2 protect monitor and profile monitor replaced
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During first injection of beam down 1A problems were encountered with the T1 protect monitor. Testing was done by Probes Group from the mezzanine
leading to the following investigation and repair work.
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Friday, April 13, 2018, 14:21, Isaac Earle, Maintenance, Other, Other, M20 beam blocker MRO and T1/T2 final checks
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The M20 beam blocker main shaft seals were replaced as per the T1/T2 target device maintenance schedule. Both air cylinders were found to be leaking
past the seals, and the blocker would not actuate in the hot cell even with 100psi (max site air) so they were also replaced. With the new cylinders
the blocker actuated smoothly at about 45psi. It is recommended that the air cylinders be replaced every second service (once per 10 years). |
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Tuesday, April 10, 2018, 11:20, Isaac Earle, Maintenance, Other, Cooling, T1 and T2 cooling package shutdown MRO work
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The following work was performed on the T1 and T2 cooling packages during the 2018 shutdown:
- T1 and T2 cooling packages both sampled and drained to South TNF holding tank
- Water released after testing and approval from RPG |
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Friday, April 06, 2018, 15:05, Isaac Earle, Standard Operation, Target 2, Target, T2-MK2 target MRO
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The following is a summary of MRO work done on the T2-MK2 target during the 2018 shutdown:
Jan 8: |
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Wednesday, March 28, 2018, 10:12, Isaac Earle, Standard Operation, Other, Other, Five waste pails moved to East Vault Tunnel for storage
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Five 5 gallon metal pails with active waste were moved from the Warm Cell to the Cyclotron East Vault Tunnel today for long term storage.
The pails were labeled with radioactive item tags and storage item numbers (1442 through 1446). The pails contain used resin from T1, T2, and STF,
as well as one pail with active metal parts. |
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Thursday, March 22, 2018, 17:24, Isaac Earle, Standard Operation, Other, Active Sump, RH Lab active sump released
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The RH Lab active sump level reached the high limit yesterday due to an overflow of the ultrasonic cleaner in the Rad Waste Area. The sump
was sampled by RPG, and after analysis the water was approved for release. The water was pumped out today. Local and MCR alarms functioned
as expected. |
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Wednesday, January 10, 2018, 17:45, Isaac Earle, Standard Operation, Target 2, Target, T2-MK2 beam spot photos, M20BB moved to storage pit
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The T2-MK2 target was moved from the beamline to the hot cell on January 8th. The field at 0.5m was 130mSv/hr. Photographs of the beam
spot of the Position 4 target are attached below. This is a 12mm beryllium target (ID: "JUL.06#4). This is the only target on the T2 ladder
that has seen beam since it was installed on October 10, 2017. A shielding plug was installed on the T2 flange. A new 5cm target will be installed |
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Thursday, December 07, 2017, 13:54, Isaac Earle, Development, Other, Other, Waste pails transferred from warm cell storage bunker to rad waste pit
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Six 5 gallon pails were transferred this morning from a temporary storage bunker in the Warm Cell to the Rad Waste Pit for long term storage. The
pails contain various BL1A active waste from the East Hot Cell including dozens of irradiated beryllium and graphite targets. The field from the
pails ranged from 0.1 to 9mSv/hr at 0.5m. The work was performed according to the clean-out procedure (Document-142965). |
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Thursday, October 26, 2017, 16:12, Isaac Earle, Repair, Target 1, Cooling, T1 collimator solenoid valve replaced
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Around 10pm on Sunday Oct 22 beam was tripped multiple times due to low flow for the T1 collimator cooling circuit (B1A:T1:FGCOL). Temperature
of the collimator (TC7COL, TC8COL) was monitored with reduced beam current and no increase was observed leading to the conclusion that flow was OK and
the flow gauge was faulty. Normal operation continued until around 1:30am on Oct 26 when the collimator thermocouples both rose quickly, causing |
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Tuesday, October 10, 2017, 12:09, Isaac Earle, Standard Operation, Target 2, Target, T2-MK2 position 4 target changed
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The following work was performed on the T2-MK2 target assembly during the 2017 fall shutdown:
Oct 4, 2017: |
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Tuesday, August 29, 2017, 12:17, Isaac Earle, Maintenance, Target 1, Target, T1-MK1 and T2-MK1 Hansen water fittings replaced
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The #6 male Hansen fittings for the T1-MK1 and T2-MK1 targets (both currently stored in the target storage pit) were replaced today with new units.
Some of the target assembly Hansen fittings had shown signs of leaking and the internal seals are not easily replaced.
"120V" warning labels were put on the micro-switch IN and OUT limit sensors for the profile monitors on both targets. These are |
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Thursday, July 27, 2017, 09:34, Keith C Ng, Development, Other, Other, test 2
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| test 2 |
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Thursday, July 27, 2017, 08:57, Isaac Earle, Other, Target 2, Cooling, Failed T2CS:SVSEC valves investigation
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The three failed T2 cooling system secondary side solenoid valves were tested yesterday to try to determine the problem. The test steps are
detailed below:
New spare valve (NSV) produced audible "click" and valve was seen to physically open when 24V DC driving voltage was applied
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Tuesday, July 25, 2017, 19:23, Isaac Earle, Repair, Target 2, Cooling, T2 Heat Exchanger Secondary Side Solenoid Valve Failure (again)
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At approximately 13:50 today the T2 cooling system secondary side solenoid valve (T2CS:SVSEC) failed to a closed position. This was the same
location where the valve failed on July 10th (E-Log #224), and also in Nov 2016 (E-Log #211). This repeated failure does not seem like a coincidence,
so instead of replacing the valve with a new unit, it was bypassed temporarily until we can determine the cause of the failures. A 3/4" FNPT |
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