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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 />

The optimum of moderation concept is clearly illustrated <strong>in</strong> FIG 1.23.<br />

Fission cha<strong>in</strong> reaction with fast neutron spectrum is possible and even more advantageous<br />

from the po<strong>in</strong>t of view of fuel utilization. Note that <strong>in</strong> this case, light elements must be<br />

avoided <strong>in</strong> order to keep neutron spectrum as close as possible to fission spectrum. Table<br />

1.5 summarizes the ma<strong>in</strong> types of fission reactors that gave rise to <strong>in</strong>dustrial applications<br />

<strong>in</strong> western countries.<br />

FIG. 1.23. Variation of multiplication factor with the ratio of hydrogen to uranium number of nuclei.<br />

❙ 40 ❙

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