Current through Register Vol. 24-18, September 15, 2024
(1) Shielding and
safety design. The installation must include:
(a) Primary and secondary radiation barriers
to comply with the radiation protection standards of WAC
246-221-010 and
246-221-060.
(b) If necessary, a ventilation system
designed to limit exposure to airborne radioactive materials as follows:
(i) For restricted areas, limits are
specified in WAC
246-221-040;
(ii) For unrestricted areas, limits are
specified in WAC
246-221-070; and/or
(iii) For unrestricted areas, the facility
must prohibit releases, venting, or otherwise discharging airborne radioactive
material which exceeds the limits of WAC
246-247-040 or
246-221-290 Appendix A - Table
II, unless authorized in WAC
246-221-180 or
246-221-070(2).
To calculate, concentrations may be averaged over a period not greater than one
year. Every reasonable effort should be made to prohibit releases of
radioactive material to unrestricted areas.
(2) Controls, instrumentation, and readouts.
All controls, instrumentation, and readouts must be clearly identified and
functional on the particle accelerator control console.
(3) Safety interlocks. All entrances into a
target room or other high radiation area must have interlocks that shut down
the machine if a door is opened (e.g., barrier penetrated) during irradiation.
(a) Manual reset. If the interlock engages
(shuts the machine off), the machine must stay off until manually reset at the
console.
(b) Independent function.
Each safety interlock must function independently of any other safety
interlocks.
(c) Failsafe. All
safety interlocks must ensure that any defect or component failure in the
interlock system prevents operation of the accelerator.
(4) Emergency power cutoff switch system. An
identifiable "scram" button or emergency power cutoff switch which stops
irradiation must exist in all high radiation areas. If the switch is engaged
(shuts off the machine), the system must prohibit the accelerator from
restarting until the switch in the room is reset and the main console restarted
manually. Use of this system is limited to emergency situations.
(5) High radiation area warning devices. For
areas designated as high radiation areas, the registrant must:
(a) Identify barriers (including temporary)
for and pathways to high radiation areas according to WAC
246-221-120, Caution signs and
labels.
(b) Except inside treatment
rooms in facilities designed for human exposure, install easily observable
warning lights at area entrances that activate when radiation is being
produced.
(c) Except in facilities
designed for human exposure, install an audible warning device which activates
for fifteen seconds prior to accelerator use in all high radiation areas.
Instruct all personnel in the area as to the signal's meaning.
(d) Except in facilities designed for human
exposure, install continuous radiation detection monitoring equipment. The
equipment must be electrically independent of the accelerator control and
interlock systems and be calibrated every six months at a minimum. The
equipment must provide:
(i) A remote and
local readout; and
(ii) Visual
and/or audible alarms at the control panel, entrances to high radiation areas,
and other appropriate locations.
Statutory Authority:
RCW
70.98.050 and [70.98.]080. 02-14-050, §
246-229-0060, filed 6/27/02, effective
7/28/02.
