A report on the performance of the seismic isolation subsystem during ER7 at both sites has been compiled on the DCC: G1500811

Summary: 

• High wind adversely affected uptime at LHO during ER7
• SEI watchdogs still trip without any apparent ground motion cause at both sites, but less frequently than one year ago 
• Noted SEI watchdog trip trends (sensors that trip semi-regularly with no apparent cause):
  • BS ST2 GS13 at LLO 
  • HAM 6 ISI CPS at LLO
  • EMTX HEPI actuator and ST1 T240 (within ~10 minutes) at LHO
• No sign of upconversion from trains at LLO, but not many instances of elevated ground motion in 1-3Hz range

ER7-driven requests from DetChar for the SEI team: 

• Work to improve uptime via mitigation of earthquakes and wind-driven ground motion and addressing WD trips uncorrelated with ground motion