Core Thermal Limits Flashcards
State the reason thermal limits are necessary.
Thermal limits are established to maintain fuel-cladding integrity during normal operation and transient events
Describe Radial Peaking Factor (RPF):
It is a ratio of peak heat flux at one core elevation to average heat flux for that same core elevation
Describe Axial Peaking Factor (APF):
It is a ratio of average heat flux for one elevation to average heat flux for entire core.
Describe Local Peaking Factor (LPF):
It is the product of radial and axial peaking factors
Describe Total Peaking Factor (TPF):
It is the product of nuclear and heat flux engineering hot channel factors:
Describe factors that affect peaking and hot channel factors
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Describe the function of the core protection calculator (thermal margin calculator)
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What is the peak cladding temperature?
2200 F. Above this and you get an excessive reaction of zirconium and water.
What is the nuclear heat flux hot channel factor?
It is a measure of relationship between peak linear power density to average linear power density in core at particular elevation, assuming nominal fuel pellet and fuel rod dimensions.
