Confinement Devices cont'd - doe-std-1128-98

DOE-STD-1128-98

Hood design and filtration systems should comply with the criteria

established in ERDA 76-21, Nuclear Air Cleaning Handbook (ERDA,

1976); Industrial Ventilation, A Manual of Recommended Practice by

the American Conference of Governmental Industrial Hygienists

(ACGIH, 1988); and ORNL-NSIC-65, Design, Construction, and Testing

of High Efficiency Air Filtration Systems for Nuclear Applications

(ORNL, 1970).

The hood structure should have a smooth, corrosion-resistant inner

surface that is made of or coated with easily cleaned material.

Glove boxes, conveyors, and other enclosures should be designed to

control and minimize the release of radioactive materials during normal

operations and postulated accidents. Noncombustible or fire- and

corrosion-resistant materials should be used in the construction of the

confinement system, including any shielding employed. Fixed modular

construction should be employed wherever possible, using a standardized

attachment system that will permit replacement or relocation of the

contents within the glove-box system with a minimum spread of

contamination. Fire dampers should be provided between glove boxes to

limit the spread of fire. Fire dampers should be tested frequently to

assure proper operation when needed.

The process design should minimize required hands-on operation in

glove boxes and other primary confinement units.

The glove-box design should include sufficient work space to permit

removal of materials and easy personnel access to all normal work areas,

and it should provide for the collection, packaging, storage, and/or

disposal of waste generated by the operation of the glove box.

Consideration should be given to incorporating transfer systems such as a

double door sealed transfer system for removal of plutonium from a

glove box. Types of removal and transfer systems are given in IAEA

Safety Series No. 30 (IAEA, 1981). These types of removal systems are

designed to permit entry and removal of material without breaching the

integrity of the glove box.

Automatic glove-hanging systems are available and should be considered

in the design or modification of glove box systems.

The ease of visibility for activities, accessibility of necessary in-box

controls, and ease of cleanup and waste removal should be considered in

the design of glove boxes. Glove boxes should be designed and

constructed to reduce points of material accumulation.

Equipment should be designed to preclude sharp corners, barbs or

pointed parts, and pinching points that could puncture glove box gloves

or skin. All corners should be rounded and burrs removed.

C-16