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Regional Basic Professional Training Course in Korea

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❙ 997 ❙<br />

19. Decommission<strong>in</strong>g<br />

cutt<strong>in</strong>g methods have the advantage of enhanced radiation protection, because of reduced<br />

generation of aerosols and the shield<strong>in</strong>g effect of the water. These methods require,<br />

however, special tools and control mechanisms which can operate safely underwater, but<br />

usually generate secondary wastes <strong>in</strong> the form of liquid slurry.<br />

<strong>Basic</strong> cutt<strong>in</strong>g, dismantl<strong>in</strong>g and remote operat<strong>in</strong>g capabilities have been developed and<br />

used. International <strong>in</strong>formation exchanges should be encouraged to improve the<br />

knowledge of practices. Special tools and devices may be needed dur<strong>in</strong>g the dismantl<strong>in</strong>g.<br />

In such cases, these tools and devices should be tested <strong>in</strong> mock-up trials before their use.<br />

The applicability of these techniques to the particular decommission<strong>in</strong>g project should be<br />

thoroughly assessed before selection. Where necessary, ma<strong>in</strong>tenance and periodic test<strong>in</strong>g<br />

of these tools and devices should be factored <strong>in</strong>to their deployment strategy.<br />

Selection of methods and techniques to be used <strong>in</strong> safe dismantl<strong>in</strong>g should take<br />

<strong>in</strong>to account such aspects as:<br />

(a) the types and characteristics (e.g. size, shape and accessibility) of materials,<br />

equipment and systems to be dismantled;<br />

(b) the availability of proven equipment;<br />

(c) the radiation hazards to the worker and the general public, e.g. level of<br />

activation and surface contam<strong>in</strong>ation, production of aerosols and dose rates;<br />

(d) the environmental conditions of the workplace, e.g. temperature, humidity and<br />

atmosphere;<br />

(e) the radioactive waste produced;<br />

(f) the non-radioactive waste produced; and<br />

(g) the requirement for development work.

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