Emergency Access

DOE-HDBK-1132-99

Emergency Access. Consider access by emergency personnel from the

exterior to ensure that access by emergency personnel will not endanger such

personnel or result in a public hazard, while maintaining any required

confinement or containment using air locks or other features.

Controlled Access . Control access to hazardous areas by means of locked

gates, doors, or other physical barriers to ensure both the safety of personnel

and effective administration and control of facilities.

Access and Egress . Locate support areas (e.g., the radiological control office)

near the exit from the process area for normal and emergency access, egress,

and internal traffic flow. A defect of past designs has been inadequate space at

exit areas for personnel circulation, removal of protective clothing and

equipment, monitoring equipment, and proper egress. Space near the exit area

for temporary storage of maintenance tools and equipment is desirable in some

facilities. Standard design practice is to direct normal routes of egress through

exits that contain monitoring stations.

Chemical Toxicity. Evaluate the need for chemical toxicity protection, as well as

radiation protection, since chemical toxicity exposure will often be the controlling

factor in the event of an accident (for example, when compared to an accident

involving UEU).

1.2

Equipment Arrangement .

Tanks.

1.2.1

Shop-fabricated tanks should be a maximum of 12 feet in diameter to

permit rail shipment with a preferred ratio of overall length to diameter of

2D to 4D. The maximum ratio of length to diameter is 6D.

Lube oil storage tanks should be located in a fire-rated room fitted with a

sliding fire door or outside if the tanks are over 5,000 gallons. The door

entrance can be elevated to create a diked area within the room capable

II-6