T1 Cooling Package MRO began Jan. 16, 2023.

The following maintenance tasks have been completed for T1 (this list will be updated as work progresses):

• Drained water
• Hansen fittings o-rings inspected: OK
• Replaced demineralizing flow metering valve (part number SS-8BK*)... this part was replaced because the equivalent part on T2 exhibited potential signs of wear during 2022 and was replaced in 2022 mini-shutdown (October). There are two things to note about this part: 1) when loosening it, it makes an audible *click* at some point during loosening rather than a smooth continuous feeling like the new replacement part, and 2) it appears to have originally been installed backwards in terms of the flow rate direction arrow. It is now installed correctly.
• Demineralizing resin can - exchanged with fresh resin (2023-01-18... dose rate of old resin which is currently located in the warm cell is approximately 40 uSv/h on contact)
• Replaced filters:
  
  • Target water CUNO filter (it was relatively clean)
  • M15 CUNO filter (it was relatively clean)
  • Demineralizing 90 micron filter (it was very dirty with tiny pieces of debris)
• Replaced leaky valves (see e-log 318 and 320)
• Refilled expansion tank water (see e-log 321)
• Tuned demin flow rate to 1.1 gpm, turned on pump [2023-03-06], confirmed system functionality (all sensors OK, no water leaks observed). See screenshot attached of T1 state at approximately 4:00pm on 2023-03-06 after the system had been running for a significant time.

As of now, the cooling system is ready for beam. Prior to beam-on, actuation tests of key items such as the target ladder and beam blocker need to be performed. It is expected that this will be done within the next 1-2 weeks.