Career Path > Nuclear Operator

Switching between PWR and BWR

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Bonds 25:
3: BWR have better fuel economy and actually around 60% of the fissions at EOC are from Pu 235.

You sure?

hamsamich:
probably...all the U is gettin gone....while PU is still being produced...I don't know why it would be different in BWRs though.

TVA:

--- Quote from: Bonds 25 on Nov 10, 2018, 05:48 ---3: BWR have better fuel economy and actually around 60% of the fissions at EOC are from Pu 235.

You sure?

--- End quote ---


Given I worked with Reactor Engineering on EOC start ups yes I am sure.
Its why BWR have EOC RPT/ARI

Bonds 25:
I was under the impression it was Pu-239.....

TVA:

--- Quote from: hamsamich on Nov 10, 2018, 08:05 ---probably...all the U is gettin gone....while PU is still being produced...I don't know why it would be different in BWRs though.

--- End quote ---


Voids keep neutrons at various energy states for longer. The core is a lot bigger. U238 absorbs the neutrons and ends up as PU239 and 240 ( a resonant absorber) . Transients at EOC are faster and nastier. It’s also why so many BWRs are on 2 year cycles. Bigger core, more PU239. Moderator coefficent can be slightly positive at certain times. PWR does the exact opposite.

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