WP13346 Retire CP1 Overfill System

Erik, Dave:

As a first step in dismantling the daily CP1 overfill system, I stopped and deleted its systemd service on zotvac0. Erik and I verified that this service was not being managed by puppet, and to further verify this we let the puppet agent run and then rebooted zotvac0.

To keep the EDC green for the rest of this week, I installed a dummy IOC on the container cluster which serves those CP1 channels being acquired by the EDC.

Project History

This might be good time to give a brief history of this project. The CP1 LN2 level sensor failed way back in August 2021. For many months we ran the overfill manually. Chandra suggested an automatic system be installed and the first version of my code was rolled out 17 December 2021 just before the holiday shutdown. It then ran daily through to 01 May 2026 when the CP1 regeneration was started. During this time the code had ran daily for 1595 days (4 years, 4 months, 14 days), skiping just 31 days (1.9%). During this time several improvements were made: ramping the LLCV opening to reduce mechanical noise, using rate-of-change on the thermocouples to indicate LN2 flow, sending text messages at start and completion of each fill.