R 325.5454 Ventilation systems.

Rule 454. (1) An accessible airborne radioactivity area shall be provided with ventilation adequate to reduce airborne radioactivity to concentrations that do not exceed the limits specified in column 1, table I of Rules 261 to 269. (2) A licensee or registrant shall not vent, release, or otherwise discharge concentrations of radioactive material from an airborne radioactivity area to an uncontrolled area that exceed the limits specified in table II of Rules 261 to 269 except as authorized pursuant to subrule (2) of Rule 238(2) of part 5. For purposes of this subrule, concentrations may be averaged over a period not greater than 1 year.