EJ/T 1108-2001 Design principles for containment enclosures
1 Scope
This standard specifies the use, design principles, and some standard dimensions of glove boxes, shielded glove boxes, shielded boxes with tongs, and hot cells.
This standard is applicable to containment enclosures or containment enclosure lines intended to be used for the handling or processing of radioactive and/or toxic products, as well as to enclosures requiring a clean or sterile atmosphere.
Provided that the design principles stipulated in this standard, as well as other relevant safety standards and regulations, are met, constructions and dimensions other than those specified herein may also be adopted according to special requirements.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, subsequent amendments to or revisions of any of these publications do not apply. However parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document applies.
EJ/T 1096-1999 Containment enclosures: Classification according to leak tightness and associated checking method
3 Definitions
For the purposes of this standard, the following definitions apply.
3.1
enclosure
containment device which ensures effective separation between a specified operational space and its surrounding environmental space, typically with operators and maintenance personnel enter, exit, or remain in the surrounding environment
3.2
containment enclosure
enclosure that meets specific containment requirements, with its construction and system configuration designed to prevent the leakage of the products contained in the internal concerned environment into the external environment, or the penetration of materials of the external environment into the internal environment, or both simultaneously
3.3
glove box
containment enclosure that permits handling of materials or products inside the enclosure using gloves mounted on the enclosure walls, typically mounted on the glove tray or sealing ring, with reliable seals applied to ensure separation between the internal environment of the glove box and the operator's environment. The glove boxes protected by inert gases or supplied with high-purity air are sometimes also referred to as ultra-clean glove boxes
3.4
shielded glove box
glove box equipped with additional biological shielding on the exterior of the enclosure body, used for handling products or materials with relatively high gamma radioactivity or neutron radiation inside, necessitating glove-based operation. The thickness of the external shielding layer on the working face is generally below 75mm (for Fe), and may be up to 100mm (for Fe) under special conditions, but this necessitates the use of lead-containing gloves and strict limitations on the duration of hand entry into the glove box. When neutron radiation is present inside the glove box, a boronated polyethylene sheet up to 25mm thick may be installed on the inner side of the cast iron sheet
3.5
shielded box with tongs
containment enclosure where the thickness of the shielding layer on the working face exceeds 75mm (for Fe) or direct operation using gloves is not permitted, equipped with sword-type manipulator as the operating tool
3.6
hot cell
containment enclosure with heavy biological shielding on its outer layer, used for handling or storing products or materials with high gamma radioactivity or neutron radiation inside. Shielding materials commonly used include concrete, cast iron, or lead bricks. Operations are typically performed using master-slave manipulators
A hot cell used for handling materials with lower specific alpha activity and lower risk of alpha contamination is generally referred to as a γ hot cell.
A hot cell used for handling materials with high specific alpha activity, whose leakage could cause severe spread of alpha contamination, is referred to as an α-γ hot cell. In addition to biological shielding, an α-γ hot cell also requires strict and effective alpha containment measures.
4 Choice of materials and their characteristics
The choice of constituent materials for the containment enclosure requires a consideration of various factors, such as the location, function, expected service life, ambient atmosphere, decontamination performance, market availability, and price. The choice and characteristics of enclosure body materials, seals, and shielding materials are detailed in Annex A.
5 Plastic glove boxes
The enclosure body materials of these glove boxes are primarily made of plastic, with various construction dimensions and assembly methods available.
5.1 Characteristics and applications
Contents
Foreword II
1 Scope
2 Normative references
3 Definitions
4 Choice of materials and their characteristics
5 Plastic glove boxes
6 Modular glove boxes
7 Hot-worked metal glove boxes
8 Shielded glove boxes
9 Shielded boxes with tongs
10 Hot cells
11 Design elements for various types of containment enclosures
Annex A (Informative) Commonly used materials for containment enclosures
Annex B (Informative) Seals for containment enclosures
Annex C (Informative) Example of a fully equipped glove box
Annex D (Informative) Dimensions of enclosure bodies in hot cells and models of related manipulators
