12.0 Impulse Tube Installation Through EPs

In case where tubing/piping are penetrating shielding wall, care should be taken to avoid personnel exposure to radiation streaming from radioactive sources to surrounding areas through instrument sensing lines penetrations in the shielding wall. To take care of the above, sensing lines penetrating the shield wall should be passed through embedded parts and surrounded by a pipe sleeve in the shielding wall. The open space between the pipe sleeve and the sensing lines should be filled with the suitable radiation absorbing material. Sensing lines (tubing/piping) should pass the E.P. through seal plate and suitable sealing arrangement should be provided on the seal plate using suitable fittings/bore through tube fittings etc. 

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