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4" indium flanges at the 2C rad hard valve were cleaned of the remaining indium by C. Ballard. Both upstream and down stream flanges were done, ready for installation of new valve.

Assisted vacuum group with removing 1AVA8:

- uncovered valve area and set up remote handling bridge over valve.

- shut off pneumatic supply to valve to render valve in mid position (shut off valve in 1A tunnel). disconnected electrical services and air supply for valve.

- undid the two captive RH bolts holding top half of valve body. valve body was then removed and bagged. note that gate assembly is free of valve body, body is light enough to lift out by hand.

- valve swiped, 300 to 700 CPM found on removed portion of valve. level inside valve at beam line was 6 mSv. fields at bridge not higher than 400 uSv, see survey map.

work will be continued by vacuum group.

continued with o ring replacement, replaced all relevant o ring seals on valve (valve body seal and actuator arm dynamic seals).

- valve re installed and services reconnected.

- valve cycled and checked; valve, limit switches ok.

- started T1 roughing pump at 15:25, will pump over night.

- RH setup and tools still on beam line, valve area not yet covered.

Job completed today and shielding block over valve restored.

- He leak checked valve and accessible up stream joints, no leaks found.

- J McKinnon checked power supplies for nearby steering magnets before and after covering valve. supplies working ok.

Moved 18' blocks away from triplet area in preparation for uncovering triplet. Plastic laid down up stream of t2 target station for short term storage of 6' layered blocks.

Completed uncovering shielding and RH setup over 1A Q14 triplet area, see photo for RH setup.

- D. Preddy disconnected coil #1 thermocouple on Q14 in an attempt to clear ground fault, fault still present.

- Moved three asymmetric steering magnet cables to see if ground fault cleared, no effect.

- D. Preddy will contact D. Louie for power supply issues, will contact RH when job complete.

Radiation survey map here: Jan 18 1A Triplet Area

1.5 day work delay due to plant group unavailable on the 21st of January. Gardner air compressor was being moved.

Today:

- Moved bridge off 1AQ14, cleaned and relocated.

- Uncovered 1AQ15, set up bridge over magnets, downstream of 1AQ15. Completed at 14:15.

Radiation survey map here: BL1A Q14 Q15 Uncovered

- Two magnets exposed, fields are higher (1200 uSv/h vs 600 uSv/h). Cover plate still on 1AQ15, see photo.

- Waiting for D. Preddy to complete work.

Continued work on finding ground fault in 1A triplet magnets;

D. Preddy connected ohmeters to 1AQ14 & 15 power supplies with power leads disconnected. Ohmmeters were connected from magnet power leads to ground (pwr supply chassis).

- Q14 read 250 ohm and Q15 read 3 ohm.

- Disconnected power leads on Q14 and Q16 steering magnets. No change to ground faults.

Systematically moved wires off of magnets to find ground fault

- Moved north side asymmetric steering wire on live bus bars, no change

- Moved beam spill monitor (#57) cable, saw fluctuation in resistance on Q15.

- Moved disconnected thermocouple wire (from last year) on Q15, resistance change was observed.

- Moved thermocouple cable on coil #11, resistance change observed. No change on coil # 5.

- Resistance varied from 3 ohm to infinity.

Replaced RH bridge over Q15 shield block to facilitate re-installation of disconnected thermocouple.

- Removed RH bridge over Q15.

- Re-installed Q15 shield block.

- Re-installed 8' bridge over Q14 space.

- J. McKinnon reconnected thermocouple connectors & bound with Ø1/16" aluminum wire before covering. See photo.

Q14 re-covered with shielding.

- Cover plate on Q14 replaced.

- No water was found on beam line floor.

1AQ14 shielding restored and two lead panels replaced to cover T2 monument. See photo.

Tomorrow:

- Uncover Q15 # 16 to find ground fault.

Continued with work on finding ground fault on 1A triplet;

Uncovered Q15 & 16 to 1AS1 area. See photo below for setup.

Disconnected last years thermocouple cable (coil circuit #9) at connector, no effect on ground fault.

- Removed connector cable rad levels: 10 uSv @ 0.5m 100 uSv on contact. No removable contamination.

- Cable stored in hot block storage.

- Will re-connect in future date and left in 1A service chase.

Q15 ground fault appears to be in the cables running into the triplet service chase. Moving beam spill monitor cable (BMS #57) appeared to have most effect on resistance in ground fault.

- Chase and cables shown in photo.

- Wiggled beam monitor cable, resistance varied from 4800 ohm to infinity.

T. Moskven disconnected BMS #57 at control rack.

- No change to ground fault resistance, at 4800 ohm.

- T Moskven reconnected BSM control cables after days work was completed.

Compared Q16 power supply to ground for reference.

- Disconnected asymmetric steering power leads (1ASM 11A & B) to Q16 and disconnected Q16 power supply.

- Resistance measured at 0.470 M ohm from coil power lead to ground.

- Reconnected magnet power supplies after.

Discovered that the aymmetric steering leads (pyrotenax cable) on north side of triplet magnets feeding Q14 and Q16 are disconnected at Q16 power supply.

- D. Preddy recommends leads are unbolted at magnets. Leads appear above the four bus bars in photo.

Q14 resistance was at 250 ohm, Q15 resistance varied between 4800 ohm and infinity.

Today: Uncovered 1A triplet cable chase and reconfigured shielding. D. Preddy will continue with diagnosing ground fault on Monday.

Photo of uncovered cable chase shown below. Note that steel blocks with rust (in middle far left of photo) are contaminated.

Rad survey map from last Friday (25 January) here.

Found exposed thermal switch cable in triplet service chase.

- Fibre glass outer sheath was damaged leaving 5" of exposed cable. See photo below.

- Cable found under corner of shielding block.

- Fixed with black electrical tape, each wire individually taped, 9 wires in total. See photo.

Found Q15 thermocouples were touching water lines near yellow connector was exposed and contacting waterlines.

- Insulated with nomex paper to isolate wire/connector. See photo.

Reconnected thermocouple from 2012 and jammed thermocouple head between water lines. See photo.

Wires were moved again to see if the resistance had changed after applying fixes. Resistance to ground stayed at 4.8 kOhm.

Triplet booster pump turned back on by R. Kuramoto and D. Preddy. No problems.

Q15 power supply was reconnected and tested to 800 A. Regulator voltage at 9 A, load voltage at 60 V.

- Ground fault interlock re-enabled by C. Yee in Q15 power supply.

- Ground current measured at 20 mV (through power supply ground shunt).

D. Preddy feels power supply is okay to operate. Power supply currently off and locked out, booster pump left on. Will prepare to restore service chase shielding and uncover triplet magnets to remove asymmetric steering wires.

Restored shielding over 1A triplet chase.

Uncovered Q16 and set up RH bridge with lead blankets over Q16. 

Cut Q14 and 16 asymmetric steering leads off north side pyrotenax connector block.

C. Ballard unbolted Q16 asymmetric steering lead from Q16 working through RH bridge floor opening.

- Rad levels through RH bridge were 2 mSv/h.

- Vacuumed tops of 1A triplet blocks and T2 area.

- Total time for jobs: 1.5 min, accumulated dose 0.04 mSv.

Cut and removed asymmetric steering cables from Q14 and 16, cables are no longer resting on magnet power bus bars.

Cut short sections left on magnet and connector block. North connector block left in place. Short cable section on magnet insulated with fiber glass insulation, see photo.

- J. Mckinnon severed cables and removed unused sections. Accumulated dose for job: 0.27 mSv.

- Respirator cartridge dropped into beam line trench, see photo (on top right corner of Q14 magnet photo).

- Rad fields were the same as before. See previous survey maps for levels. Q14 rad levels, Q15 rad levels, Q16 rad levels.

Photos of Q15 before and after cable removed, note bus bars at top of photo.

D. Preddy performed power test, ground fault persists at same resistance (magnets now at 250 Ohm Q14, 3.5 kOhm Q15). Doug deems it okay to run triplet in this state.

No water was found on magnets during final inspection. All three magnets were uncovered and visually checked for water before replacing dust covers.

- Booster pump was running.

- Q15 & 16 shield blocks back in place.

- Q14 left uncovered at this time, remote handling bridge still present in area. Shielding still needs to be fully restored.

Uncovered radioactive waste storage pit to see contents. Assessing viability of moving contents inside to facilitate storage of M9 Q1 Q2 magnet. See below for some photos.

Additional photos are on the remote handling group drive.

Restored 1A triplet shielding and removed RH shielding.

1. Moved severed asymmetric steering cable on Q14 so as not to touch the coils underneath and the cover plate above it.

- Job done through RH bridge through floor tile and 6' tongs.

- Cable end pictured in center of photo toward left of magnet.

- Replaced cover plate, checked for water leaks, none found.

2. Restored Q14 shield block.

- J. McKinnon performed power test on triplet (Q14, 15, 16). Tested okay.

3. Restored triplet shielding. See photos.

- 1st layer restored.

- 2nd layer restored.

- Photo of temporary bunker for triplet shielding. Bunker was located East of T2.

Today: D. Preddy completed another power test on 1A Q14, 15, 16 after all iron/steel shielding was restored. Magnet power and steering supplies were checked and O.K.ed. R. Kuramoto deems triplet repair job completed.

Tomorrow: B. Gasbarri and J. McKinnon want to take measurements of the T2 monolith to verify its position and compare with past data, no crane activities are to occur while this is being done.

Beam lines took measurements of top of T2 using Leica Total Station. Required no crane activities over 1A blocks.

Yesterday:

Did vacuum testing on MK2 8" indium blank off; installed w/indium on test stand and put under vacuum.

- After 1 turn on spring eye nuts, a soft vacuum seal was achieved but the throttle valve (old leak detector) could not be opened. Spring eye nuts were turned in half turn increments.

- A dial indicator placed on the left of the test jig showed 0.010" movement of the blank off plate within 2 minutes after vacuum was started, after 1 one turn was applied on each spring eye nut. Under vacuum this increased to 0.015" after 5 minutes.

- It was noted that the KF40 flange on the test jig contained a pinhole leak therefore threw off the results. The indium seal appeared to be vacuum leak tight (due to no or low response) when He was applied in close proximity to the flange. The KF side had an immediate response to He.

T2 M9 volume was pumped out by E. Dalla Valle.

- Done in place of actual He leak testing of rubber blank off plate.

- E. D. V. noted that the vacuum level achieved was better than the indium seal used at T2 M9. He feels there is nothing wrong with the flange due to the vacuum level.

Removed "suck tube" filled with active/contaminated water from top of 1A beam line blocks to meson extension hall warm cell lab. Highest activity recorded was measured at 22mSv on contact, 2000µSv @ 1/2 m. Tube was bagged and craned over to warm cell lab for temporary storage and will be dealt with at a later date. See work permit 2013-12-12-2 for more details.