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[Aschenauer Elke-Caroline <elke AT bnl.gov>]

Dear Xu,

concerning the HV / ISEG HV module trip.

We have currently radiation problems in STAR quite some modules behave strangely due due to single bupsets.

Can you remind me where this module sits physically. Is this a new module we bought for the FST or is it one we recycled from the IST.

Thanks elke

On Jan 5, 2022, at 11:48, Xu Sun <sunxuhit AT gmail.com> wrote:

Hi All,

We refilled the coolant tank for FST this morning during the access.

The tank level now is 78% after stabilized, which is the same level as last refill.

The coolant should be good for another two months.

Since yesterday, multiple FST HV trips have happened during the day shifts.

I watched the evening shift to try to diagnose.

Two HV trips since the start of yesterday's evening shift.

1st at 17:57: module 5, 6, 7, 8 on RDO 5 and RDO 6 tripped at the same time. Since all 4 modules belong to the same ISEG module, it seems like the whole ISEG module HV tripped.
2nd at 20:!2: module 9, 10, 11, 12 on RDO 4 tripped at the same time. And those 4 modules are also on the same ISEG HV module.

No trip happened since then.

It seems like to me the trip is from the ISEG HV module, not the FST module.

We will keep monitoring the status and keep you updated.

Best,

Xu

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