Piping Containing Radioactive Materials cont'd

DOE-HDBK-1132-99

Isolation valves should be provided where radioactive material passes

through compartments or rooms.

Piping that contains radioactive material should be routed so that no

direct lines-of-sight exist through doorways or labyrinths.

In occupied areas, wall, ceiling, and floor penetrations should be provided

shielding from piping containing radioactive materials.

Valves requiring frequent operation may be fitted with remote mechanical

reach rods.

Remote valve operators should be located externally to the compartment

housing the valve.

Stagnant or low-point pockets should be avoided in any radioactive piping

system.

Restricting orifices or metering plates in piping systems containing

radioactive materials should be located in vertical runs. They can be

located in horizontal runs if drains are provided on both sides of the

instrument.

The piping system should be designed to preclude solids from settling in

the piping.

Process lines should be free-draining to prevent fluid accumulation in

traps. In cases where low points or traps cannot be prevented by design,

a drain and collection system should be provided at each low point.

Encasement piping should drain into the process pit in which it

terminates.

II-15