Hye to all our blog readers, thanks to all because can spend some time to read and focus on our blog. Off course we will give you again information about nuclear.. hope that the readers can give some comments and criticism… thank you for your support…
Now, we will share some information about “NEUTRON POISONS”.
Have you ever know about the neutron poisons? Off course some of you know and for who do not about it, let me explain.
NEUTRON POISONS = RACUN NEUTRON???
Yes. Off course, it is also can call NEUTRON ABSORBER or NUCLEAR POISON which is a substance with a large neutron absorption cross-section in applications, such as nuclear reactors, when absorbing neutrons is an undesirable effect.
If you still blur and don’t know about it, let me give you an example. For example, other materials in the reactor decay to materials that acts as neutron poisons.
DECAY OF TRITIUM TO HELIUM-3
Since tritium has a half-life of 12.3 years, normally this decay does not significantly affect reactor operations because the rate of decay of tritium is so slow. However, if tritium is produced in a reactor and then allowed to remain in the reactor during a prolonged shutdown of several months, a sufficient amount of tritium may decay to He-3 to add a significant amount of negative reactivity. Any He-3 produced in the reactor during a shutdown period will be removed during subsequent operation by a neutron-proton reaction.
To our readers, let me explain about this more.
Neutron poisons can be divided into 3:-
a) Burnable poison - materials that have a high neutron absorption cross section that are converted into materials of relatively low absorption cross section as the result of neutron absorption.
b) Soluble poison – also called chemical shim is a soluble neutron poison that is circulated in the coolant during normal operation.
c) Non-burnable poison – material that has relatively constant neutron absorption characteristics over life cycle.
FIXED BURNABLE POISON VS SOLUBLE POISON
So, from our point of view, every neutron poisons have their own advantages.
Therefore, let we finish this part as we can conclude that neutron poison have 3 categories as we know. So, we will continue searching about nuclear as far as we can and we will share the information to all steady readers. Thank you again for your support and we will meet again in the next column. Thank you.
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4 comments:
Good. Please continue producing this kind of articles. Now the challenge is to make them interesting.
tq sir...we'll try to make better and better next time...=)
hallow to nusantaraberangan.........
after reading your article, i have some confusions .u never mention relationship between chemical shim and fixed burnable poisons.so i want to ask several question..
1)what are the advantages of chemical shim over fixed burnable poisons?
2)how about also the advantages of fixed burnable poisons against chemical shim? It's possible?
i hope that u can give the nice answer...tq..:)
khuzaimi bin kamaruddin
acai_otai@yahoo.com
tq to khuzaimi,
assalamualaikum...
below are the answer that i can share with you..
1)chemical shim has a spatially uniform effect and possible to increase or decrease amount of poison in the core during reactor operation.
2)fixed burnable poison also has advantages against chemical shim which are can better shape or control core flux profile and do not make the moderator temperature coefficient less negative.
i hope that you satisfy with my answer..
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