Attachment 1

BFNPER 155668 Reactor Bldg Crane Main Hoist Brake Study Page 1 of4 Attachment 1 BFNPER 155668 Reactor Bldg Crane Main Hoist Brake Study Introduction   BFNPER155668 During U1C7 outage when the vessel head was raised approximately 4 inches off the vessel flange the lift was stopped to verify a level rig to prevent binding on the guide caps or thread protectors During this level check the head slowly lowered back down to the reactor vessel flange This slow lowering of the head was not observed by any of the riggers associated with the lift After a short discussion between the Person in Charge established per MMTP103 the Flagman and the Crane Operator a decision was made to lift the head again The Refuel Floor Supervisor Task Manager and the Refuel Floor SRO were not informed or consulted It is important to note that the only personnel with the proper vantage point to see that the head had slowly lowered were the Person In Charge and the two craft personnel checking the head level The vessel head was lifted a second time to approximately 4 inches and again the head slowly lowered back to the vessel flange The lift was secured and the Refuel Floor Supervisor Task Manager and the Refuel Floor SRO were informed

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