Question

When is Gadolinium used in some fuel rods? It is used in all burnup cycles, to...

When is Gadolinium used in some fuel rods?

It is used in all burnup cycles, to have negative moderator temperature coefficient

It is used in short burnup cycles, to have less critical boron concentration at the Beginning-Of-Life (BOL)

It is used in long burnup cycles, to have less critical boron concentration at the Beginning-Of-Life (BOL), and have negative moderator temperature coefficient

It is used in any cycle to control slow reactivity changes

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Answer #1

For this reason gadolinium is widely used as a burnable absorber, which is commonly used in fresh fuel to compensate an excess of reactivity of reactor core. In comparison with another burnable absorbers gadolinium behaves like a completely black material.

to use all burnable absorbers to ensure that the beginning of cycle moderator temperature coefficient remains within the design limit

If you have any doubts then ask in comment section otherwise kindly rate the positive this session bye.

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