Conduct of Radiological Work
Part 8 Design and Control
381 Radiological Design Criteria
The following design objectives are applicable during the design of new facilities and modification of existing facilities.
Additional design criteria are provided in DOE Order 420.1.
For areas of continuous occupancy (2000 hours per year), the design objective shall be to maintain the average
exposure level ALARA and below 0.5 millirem per hour. If occupancy is not continuous, the design objective shall
be to maintain doses ALARA and below 20% of the occupational dose limits provided in Table 2-1 [see
835.1002(b)]. DOE recommends that design criteria be established to limit individual worker doses below 0.25
millirem per hour (500 millirem TEDE per year).
For control of airborne radioactivity, the design objective shall be to avoid releases to the work place atmosphere
under normal conditions and, under any conditions, to control inhalation by workers to levels that are ALARA.
Confinement and ventilation shall normally be used [see 835.1002(c)].
For materials used in facility construction and modification, the design objective shall be to select materials that
facilitate operations, maintenance, decontamination, and decommissioning [see 835.1002(d)]. Components should
be selected to minimize the build up of radioactivity. Control of surface contamination should be achieved by
containment of radioactive material.
In justifying facility design and physical controls, optimization methods shall be used [see 835.1002(a)].
Support facilities should b e provided for donning and removal of protective clothing and for personnel monitoring,
A neutron quality factor of 20 for conditions of unknown spectra (or doubling of the neutron quality factor
associated with known neutron energies) should be used for design purposes only. Design analyses based on
these neutron quality factors are intended to estimate the additional construction cost resulting from neutron
quality factor increases. The results of these analyses should be used to ascertain the economic feasibility of
incorporating such modifications in the final design. This quality factor is not to be used for determination of
individual dose equivalents.
Existing facility designs that have office space and lunchrooms or eating areas within radiological areas, radioactive
material areas, and radiological buffer areas require priority attention. Generally:
Locating lunch rooms or eating areas, restrooms, drinking fountains, showers and similar facilities and devices
is strongly discouraged within these areas
Locating office spaces within these areas is strongly discouraged; to the extent that such space is essential to
support radiological work, steps should be taken to preclude unnecessary occupancy.
Facilities currently under construction should be evaluated and the above criteria applied where practicable.