Reactor fuel transfer port adapter assembly

Fig. B.ll. Reactor fuel transfer port adapter assembly.

After reactor shutdown, the refueling plug in the reactor vessel lid is removed from the fuel transfer port and an adapter and floor valve are installed on the port. The control rod drive shafts are also discoimected, and the instrument trees are moved to their stored positions. The CLEM then picks up the CCP (with the fresh-fuel assembly) from the interim decay storage vessel, transports it to tiie reactor, and lowers it into the reactor through a fuel transfer port. 

The CLEM then picks up the CCP, containing the SNF assembly, and transfers it to the interim decay storage vessel. The cyclic process of moving fresh fuel to the reactor core and SNF back to the interim decay storage vessel continues until all the refueling operations have been completed. Before reactor startup, the IVHMs are placed in their stored positions in the reactor, the instrument trees and control rod shafts are restored to power-operation status, the adapters and floor valves are removed, and the fuel transfer ports are sealed with their plugs. 

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