 Friday, October 12, 2012, 15:12, Keith C Ng, M9, Repair, M9 T2 Joint Repair cont. 
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Joint repair continues.
Leak Check: |
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Monday, October 15, 2012, 17:03, Keith C Ng, M9, Repair, M9 T2 joint repair cont.
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Today:
- Removed pins and removed indium through ring. Joint fully open at 14.5 to 15 turns of retraction mechanism.
- Did initial video inspection of T2 and Q1 flanges, some residual indium on knife surfaces, did initial scraping of T2 flange. (see videos on |
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Tuesday, October 16, 2012, 19:47, Grant Minor, M9, Repair, Inspection of failed double-indium thru-ring TB22148
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See inspection notes attached for failed M9T2 double-indium thru-ring TB22148, inspected on Oct 15th 2012.
Ring was approximately 3 mSv/hr on contact and 100 uSv/hr at 0.5 m.
Total dose accumulated during inspection on dosimeter 122 was 0.1 mSv |
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Tuesday, October 16, 2012, 19:50, Grant Minor, M9, Repair, M9T2 Joint Repair - Status Update 16 Oct 2012
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| See attached. |
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Thursday, October 18, 2012, 08:26, Keith C Ng, M9, Repair, M9 T2 joint repair cont.
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Yesterday:
Installed indium blank off at M9 T2 joint and pumped down at 15:20 to 15:45 overnight. 1ACG7 (T2 vacuum pressure) reads between 6.0E-3mT and 2.0E-2
mT as of 8:15 today. |
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Thursday, October 18, 2012, 16:28, Keith C Ng, M9, Repair, M9 T2 joint repair cont.
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Today:
Completed leak check of M9 T2 area: joint(s) are He leak tight. Remote He lines checked as well, see attached.
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Friday, October 19, 2012, 16:48, Keith C Ng, M9, Repair, M9 T2 Joint Repair cont.
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Today:
Cleaned up work site and removed extraneous poles and tooling. Radioactive parts stored in lead flask now located on TNF.
- Two pins, an RH bullet bolt and indium ring (tb22148) were put into lead flask for storage, flask now located on TNF. |
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Friday, October 19, 2012, 18:21, Grant Minor, M9, Development, 8" double-ring test samples of EPDM and BUNA-N (Nitrile)
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Today I picked up two 2FT x 4Ft x 0.125" thick strips of stock EPDM and BUNA-N (Nitrile) material from BC Rubber Supply. A copy of the Packing
Slip is attached. Here is the information from the Sample Sheet:
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Monday, October 22, 2012, 15:48, Keith C Ng, M9, Repair, M9 T2 clean up and shield restoration
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Today;
Restoring shielding at M9 T2 area and cleaning up RH setup.
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Wednesday, October 24, 2012, 11:53, Keith C Ng, M9, Repair, M9 T2 blank off complete
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Shielding around m9 t2 restored as of 11:45, vacuum levels still the same since 19 October.
- Work permit returned.
- A dose record of the job is attached as a spread sheet. Total dose for all workers is 1.89 mSv for the job. |
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Thursday, February 07, 2013, 16:02, Keith C Ng, M9, Repair, M9 Q1 Q2 removal, site prepration
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Started work on removing M9 Q1 Q2 magnets; area clean up and preparation, removing shielding above Q1 and Q2 and remote handling setup over magnet (moving
blocks).
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Friday, February 08, 2013, 15:31, Keith C Ng, M9, Repair, M9 Q1 Q2 removal, site prepration
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Completed remote handling/shielding setup over T2 M9, see photos for setup.
- Rad levels at 16' above Q2 were 1.2 mSv/h. Shielding was built up to 20' level, same as the opposite side to minimize exposure.
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Wednesday, February 13, 2013, 15:49, Keith C Ng, M9, Maintenance, M9 Q1 Q2 removal, preparation
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Local and remote leak checks on M9 T2 area were done today to confirm leak; Leak was still present at T2 M9 joint. M9 Q1 and Q2 power supply leads were
disconnected (C. Yee). Next task is to find the ground fault on the Q1 magnet.
Indium one piece blank off plate (TB22267) for blanking off assembly (TB22265) was submitted into shop today. |
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Thursday, February 14, 2013, 15:43, Keith C Ng, M9, Maintenance, M9 Q1 Q2 removal, preparation
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Removed 8" rubber test rings from M9 T2 joint. Rings moved to RH warm cell. Radiation levels were 70 µSv on contact 1.7 µSv @ 1/2 m.
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Friday, February 15, 2013, 14:29, Keith C Ng, M9, Maintenance, M9 Q1 Q2 removal, preparation
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Beam lines group purged M9 Q1 Q2 magnets and water lines in preparation of disconnecting water services to those magnets, done in morning.
- Note: Q15 protueus paddle wheel was replaced after finding it was worn
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Monday, February 18, 2013, 16:24, Keith C Ng, M9, Repair, M9 Q1 Q2 removal, electrical and water disconnected
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Today, re-arranged electrical wiring on Q1 Q2 magnet away from Q2 indium joint. Cable bundles were bundled as neatly as possible.
- One of the klixon thermal switch wires broke off while the cable bundles were being organized. See photo.
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Tuesday, February 19, 2013, 16:46, Keith C Ng, M9, Maintenance, M9 Q1 Q2 removal, preparation
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Determined M9 Q2 service stand supply connector was slowly leaking.
- Ball valve to the supply was leaking through allowing trace amounts of water through.
- System was bled again and pressure relieved, leak appears to have stopped. |
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Thursday, February 21, 2013, 17:02, Keith C Ng, M9, Maintenance, M9 Q1 Q2 removal, joint dissassembly
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CUALCW system water loss was not from 1A triplet. Q15 Q16 held static pressure at 90 psi since 9 am until 17:00. Holding with very minimal change in
pressure. Q14 reading 64 psi as of 17:00. D. Preddy informs all other systems leak tight.
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Friday, February 22, 2013, 17:27, Keith C Ng, M9, Repair, M9 Q1 Q2 removal, Q2 joint dissassembly
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M9 Q2 15" pin drive was removed and disconnected.
- Pin drive retention screw had to be completely removed to be able to remove pin drive completely.
- Had to make tools to remove pin drive and retention screw, see photos. |
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Monday, February 25, 2013, 16:37, Keith C Ng, M9, Maintenance, M9 Q1 Q2 removal, Q2 seal disassembly 7x
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Removed Q2 15" indium seal ring, discovered seal contained rubber on both sides instead of indium.
- Some kind of oil residue seen at the bottom of the sealing ring and inside of the Q2 vacuum box. (Note: Oil residue was from downstream vacuum
roughing pumps. They were connected when T2 M9 joint was leaking. Oil got into the vacuum pump back streamed into the beam line.) |
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