NAC459.746. Safety requirements: Expert assistance; shielding; controls; interlock systems.

     1. A qualified expert, specifically accepted by the Division, must be consulted in the design of a particle accelerator installation and called upon to perform a radiation survey when the accelerator is first capable of producing radiation.

     2. Each installation of a particle accelerator must be provided with such primary and secondary barriers as are necessary for compliance with NAC 459.325 and 459.335.

     3. Instrumentation, readouts and controls on the particle accelerator control console must be clearly identified and easily discernible.

     4. All entrances into a target room or other area of high radiation must be provided with interlocks that shut down the machine when any entrance is penetrated.

     5. After an interlock system has been tripped, it must be possible to resume operation of the accelerator only by manually resetting controls first at the position where the interlock has been tripped and last at the main control console.

     6. Each safety interlock must be on a circuit which allows its operation independently of all other safety interlocks.

     7. All safety interlocks must be fail safe, that is, designed so that any defect or component failure in the interlock system prevents operation of the accelerator.

     8. A scram button or other emergency power cutoff switch must be located and easily identifiable in all designated areas of high radiation. Such a cutoff switch must include a manual reset so that the accelerator cannot be restarted from the accelerator control console without resetting the cutoff switch.

     [Bd. of Health, Radiation Control Reg. §§ 9.3.3-9.3.4.6, eff. 2-28-80]—(NAC A 1-18-94)