If the forebay level is below 433m and unit(s) 1 and/or 2 trip to speed-no-load, should the Plant Operator attempt to re-sync?
No. Leave the unit(s) in SNL. Anytime there is a trip with the forebay below 433m, flows should be restored by other means than re-synchronization since the channel stability timer (24 minutes) will be in effect. Depending on the day and time, call the lock-keeper or initiate RGO. In either case, inform Fortis of the occurrence once corrective action has been initiated.