Target Entrance System Mechanical Interlock

Shield door controls, and Target Entrance System Mechanical Interlock. 

Target Entrance System Mechanical Interlock Protection of HCF personnel from potentially lethal radiation exposures. The TES mechanical interlock must prevent a STB operator from removing the TES shield cover when the lid has been removed from a shield cask inside the TES. Administrative controls are in place to ensure periodic testing of the TES mechanical interlock that prevents removal of the TES shield cover when the shield cask lid has been removed. 

Target Entrance System (TES) mechanical interlock Worker safety Prevent removal of shield cask from STB with improperly installed cask lid Interlock is operable... 

The Target Entrance System (TES) mechanical interlock provides a worker safety function by preventing the removal from the TES of a shield cask containing an irradiated target without the shield cask lid properly installed. This interlock is relevant to both of the operational modes, since target transfer operations could be accomplished in either of these modes. 

A shield cover in the Target Entrance System (TES) is designed to remove the shield cask lid so that the cask and target can be translated after the lid is removed. A mechanical interlock (a metal pin) is physically pushed by the shield cask lid when it is removed from the cask. This pin extends into the shielding wall to prevent the removal of the TES shield cover with the cask lid removed. This assures that workers cannot be exposed to an unshielded irradiated target when the cask is removed from the TES. 

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