A third lid down operation took place over May 6-7, 2024.

The system was energized a few minutes ahead of time.

Starting master synchro value: 47387 (after it was jogged up slightly prior to starting).

Upon startup on May 6 at 14:42, the system worked fine and lowered the lid. The lowering was paused at 15:28 (master synchro value of 17593).

Jack 6 exhibited issues similar to previous lid up (see e-log 166). It was likely due to an issue with a motor contactor. Electricians were contacted but could not work on the issue until the following day so the lowering was paused.

At 07:30 on May 7, electrician Randy Boehm determined that a cable connector on the motor contactor was loosened. After tightening the cable, jogging motor 6 was tested - OK.

Lid down commenced again at 08:10. Master synchro: 1915.

The lowering was stopped at approximately 1" gap as per standard procedure for Operations to perform checks. The lowering was stopped again multiple times to check resonator latching - OK.

End time: 08:37

Ending master synchro value: 59

Jogged master synchro value to 2, adjusted station 12 to match.

Notes: It was observed that at lid down Jack 12 did not have any gap. Jack 12 was jogged to match synchro values with the master synchro but still exhibited a 0.125” gap instead of the ideal 0.25” gap. It is recommended to keep an eye on Jack #12 during the next operation and check the motor contactors for loose fittings. In the before and after photos of the motor contactor it looks like the fitting on the bottom right corner of the motor contactor could have either come loose from the vibrations or the screw was sheared off. Further investigation is required.

See attached summary.