 Wednesday, June 06, 2012, 16:58, John Wong, UO2/C, UCx-heatboat#2, , Done, UC2 flakes for UCx#4: batch#01-04062012 7x
|
 Monday, June 11, 2012, 10:48, John Wong, UO2/C, UCx-heatboat#2, , Problems, UC2 flakes - batch#01-04062012: broken seal & TGHT power supply
| |
Tuesday, June 12, 2012, 11:38, John Wong, UO2/C, UCx-heatboat#2, , Problems resolved, UC2 flakes - batch#01-04062012: broken seal & TGHT power supply
| |
Sunday, June 24, 2012, 22:52, John Wong, UO2/C, UCx-heatboat#2, , Problems, UC2 flakes - batch#01-04062012: IOC problems
| |
Monday, June 25, 2012, 16:00, John Wong, UO2/C, UCx-heatboat#2, , Problems resolved, UC2 flakes - batch#01-04062012: Fiber converters failed
|
|
| John Wong wrote: |
|
Wednesday, June 06, 2012, 16:55
The UO2/C green was prepared on June 04, 2012.
UO2 powder used = 50.26g
C-grv used = 10.14g.
Dry UO2/C green mass = 61.71g.
The green was rolled and wrapped in a piece of graphite sheet.
The target boat was wrapped with 3 Ta-heat shield and installed in the Evap#1.
The chamber is currently being pumped down.
|
Monday, June 11, 2012, 10:31
Last week during the pump down of the chamber (vacuum got down to low 10e-5 Torr), the cooling was open in preparation of turning on the target heater. A vacuum excursion was triggered (pressure went up to 300mTorr), and the system was tripped off. It was suspected that there was some leaks.
A leak test was performed - all the water connecters & joints are fine. The seal for the chamber lid was found leaky (5e-8 atm cc/sec). The seal was replaced and the vacuum was improved but no perfect.
The chamber has been pumped down over the weekend, pressure currently at 2.3e-6 Torr.
Coincidentally, the TGHT power supply is broken. The initial action was to turn on the power supply at 0A when the chamber vacuum had gone down to 10-6 Torr. But the power supply did not regular and shot up to 1000A and caused a vacuum excursion. Ray Dube will replaced it.
|