Enthelpy rise hot channel factor and Radial form factor

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Discussion Overview

The discussion revolves around the concepts of "Enthalpy rise hot channel factor (FdH)" and "Radial form factor (RFF)" in the context of designing a whole-core for small pressurized water reactors (PWR). Participants are exploring the differences between these factors and their implications for core life calculations.

Discussion Character

  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant seeks clarification on the difference between FdH and RFF, noting that they have calculated "CHANNEL FDH" and are questioning whether "CHANNEL PIN FDH" is necessary for accurate results.
  • Another participant expresses uncertainty about RFF, suggesting it may refer to radial power density and distinguishes between FdH as a maximum pin value and RPF as an assembly average quantity.
  • A later reply proposes that RFF is actually the radial peaking factor, asserting that FdH should always be higher than RFF due to the nature of their definitions.
  • Multiple participants inquire about the coding tools being used, with PANTHER code mentioned as the tool of choice by some.

Areas of Agreement / Disagreement

Participants exhibit uncertainty regarding the exact definition of RFF, with differing interpretations presented. There is no consensus on the relationship between FdH and RFF, and the discussion remains unresolved.

Contextual Notes

Participants have not fully clarified the definitions of RFF and its relationship to radial power density, leading to potential misunderstandings. The discussion also reflects varying levels of familiarity with the concepts and tools involved.

Syed Alam
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I am currently designing a whole-core for small PWR.
I am calculating core life (years) vs. FdH and RFF.

What is the difference between "Enthalpy rise hot channel factor (FdH)" and "Radial form factor (RFF)"?

I have calculated "CHANNEL FDH" which is same as "RFF". Do I have to try "CHANNEL PIN FDH" for getting the correct result for "Enthalpy rise hot channel factor (FdH)"?
 
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Syed Alam said:
I am currently designing a whole-core for small PWR.
I am calculating core life (years) vs. FdH and RFF.

What is the difference between "Enthalpy rise hot channel factor (FdH)" and "Radial form factor (RFF)"?

I have calculated "CHANNEL FDH" which is same as "RFF". Do I have to try "CHANNEL PIN FDH" for getting the correct result for "Enthalpy rise hot channel factor (FdH)"?
What code(s) is one using?
 
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I'm not sure what RFF is, but if it's the same thing as radial power density, the difference between FdH and RPD is that FdH is the max pin, on a pin by pin basis, while RPF is an assembly average quantity.
 
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Astronuc said:
What code(s) is one using?
I am using PANTHER code.
 
Astronuc said:
What code(s) is one using?
PANTHER code.

Thanks!
 
QuantumPion said:
I'm not sure what RFF is, but if it's the same thing as radial power density, the difference between FdH and RPD is that FdH is the max pin, on a pin by pin basis, while RPF is an assembly average quantity.
Thanks!
 
Based on your other thread I believe RFF is actually the radial peaking factor, not a radial power density, but result is the same. FdH should always be higher than RFF since FdH is highest pin while RFF is highest average assembly.
 

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