Resonance Self Shielding Correction Definition

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Discussion Overview

The discussion revolves around defining the "resonance self shielding correction," particularly in the context of nuclear reactors. Participants explore its implications in both homogeneous and heterogeneous reactor designs, focusing on neutron flux behavior and resonance absorption characteristics.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • One participant describes the behavior of neutron flux in homogeneous versus heterogeneous reactors, noting that self-shielding occurs due to the resonance absorption cross section of the fuel, leading to a lower neutron flux in fuel pins compared to the moderator.
  • Another participant suggests that the concept of self-shielding involves high cross-section resonances shielding themselves and other resonances, indicating a potential overlap in definitions.
  • A third participant expresses confusion over the definitions, indicating that multiple interpretations exist within the discussion.

Areas of Agreement / Disagreement

Participants do not appear to reach a consensus on a single definition of the resonance self shielding correction, with multiple competing views and some confusion regarding the terminology.

Contextual Notes

There are indications of varying interpretations of the term "self-shielding," and the discussion highlights the dependence on reactor geometry and composition, which may affect the understanding of the correction factor.

terryphi
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Hello,

I was hoping that someone might be able to provide a definition for the "resonance self shielding correction".

-TP
 
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In a homogenous reactor (e.g. liquid fuel mixed with moderator), the neutron flux is relatively constant because there is a equal distribution of fuel and moderator particles. When you have a heterogeneous reactor (e.g. solid fuel pins surrounded by water), neutrons have a higher chance of slowing down without being resonance absorbed because they can bounce around in the moderator without worrying about hitting a fuel atom while in the resonance range. The fuel shields itself from the neutron flux due to its resonance absorption cross section and therefore there is a relatively lower neutron flux in the fuel pins compared to the moderator.

The self-shielding correction factor is the degree of this effect, which mainly depends on the geometry and composition of the reactor.
 
I believe it refers to the high cross-section resonances shielding themselves and other resonances. The self-shielding is the same concept more or less.
 
I've actually heard both definitions, so I'm confused.
 

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