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Regional Basic Professional Training Course in Korea

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<strong>Regional</strong> <strong>Basic</strong> <strong>Professional</strong> <strong>Tra<strong>in</strong><strong>in</strong>g</strong> <strong>Course</strong> (BPTC) on Nuclear Safety<br />

waste, on the basis of the concentration of nuclides with half‐life substantially more than<br />

30 years <strong>in</strong> the waste. In the long‐lived waste, the average concentration of alpha‐emitt<strong>in</strong>g<br />

act<strong>in</strong>ides is typically at least a few 100 Bq/g. As LILW from NPPs conta<strong>in</strong> usually only<br />

trace amounts of act<strong>in</strong>ides and other long‐lived nuclides, it is generally classified as short‐<br />

lived waste.<br />

The radioactive content <strong>in</strong> LILW from NPPs consists of activation products and fission<br />

products; the dom<strong>in</strong>at<strong>in</strong>g nuclides are given <strong>in</strong> Table 20.1. It can be seen that their half‐<br />

lives range from about one month to one hundred years and some trace nuclides are even<br />

more long‐lived. Because of the presence of nuclides with relatively long half‐lives,<br />

age<strong>in</strong>g of waste for more than a few months seldom facilitates its further management.<br />

This may be a practicable way of tak<strong>in</strong>g care of the waste only <strong>in</strong> cases <strong>in</strong> which the<br />

activity concentration is close to the clearance level.<br />

The accumulation of conditioned LILW varies from less than 100 m3 to several 100 m3<br />

per year and NPP unit. The accumulation of waste depends ma<strong>in</strong>ly on the reactor type<br />

and management practice. By means of careful plann<strong>in</strong>g of practices and adoption of<br />

appropriate treatment and condition<strong>in</strong>g techniques, waste generation can be considerably<br />

limited. The overall activity <strong>in</strong> operational LILW, exclud<strong>in</strong>g activated metal waste,<br />

typically varies <strong>in</strong> the range of 0.1‐10 TBq per year and NPP unit, depend<strong>in</strong>g on e.g. the<br />

number and severity of fuel leakages and the extent of repair and ma<strong>in</strong>tenance works.<br />

20.5.2. Treatment of waste<br />

Gaseous radioactive waste management<br />

Any radioactive materials from gaseous radioactive effluent shall be treated through a<br />

filter <strong>in</strong> the ventilation system before its release through the stack to the outside<br />

❙ 1028 ❙

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