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On June 11, 2008, as a result of a review … On June 11, 2008, as a result of a review of the Reactor Building crane structure by the original Reactor Building cranes did not ensure the crane structural integrity during a design basis seismic event.</br></br>Specifically, the allowable design stresses for the design basis seismic event are exceeded in the end connector plates and bolted connections connecting the crane girders. This condition has existed since operation of the plants began.</br></br>The direct cause of this event is that the crane girder end connection design was not adequately evaluated during the initial design of the crane by Whiting Corporation (i.e., the OEM). The crane design was performed by Whiting Corporation in the 1970's. Due to the historical nature of this condition, determining a plausible cause is not practical or feasible.</br></br>Modifications have been implemented for the Unit 1 and Unit 2 Reactor Building cranes to allow continued restricted use of the cranes for loads of up to 40 tons. Engineering Changes will be developed and implemented to restore the cranes to their original seismic design requirements.heir original seismic design requirements. +
June 11, 2008 +
On June 11, 2008, as a result of a review … On June 11, 2008, as a result of a review of the Reactor Building crane structure by the original Reactor Building cranes did not ensure the crane structural integrity during a design basis seismic event.</br></br>Specifically, the allowable design stresses for the design basis seismic event are exceeded in the end connector plates and bolted connections connecting the crane girders. This condition has existed since operation of the plants began.</br></br>The direct cause of this event is that the crane girder end connection design was not adequately evaluated during the initial design of the crane by Whiting Corporation (i.e., the OEM). The crane design was performed by Whiting Corporation in the 1970's. Due to the historical nature of this condition, determining a plausible cause is not practical or feasible.</br></br>Modifications have been implemented for the Unit 1 and Unit 2 Reactor Building cranes to allow continued restricted use of the cranes for loads of up to 40 tons. Engineering Changes will be developed and implemented to restore the cranes to their original seismic design requirements.heir original seismic design requirements. +
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05:20:25, 1 December 2017 +
August 11, 2008 +
June 11, 2008 +
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