Reactor
Reactor
(OP)
Hello,
I am a mechanical engineer. While my knowledge about archaeology is more than nuclear sciences I appreciate your guidance for solving following problem:
How can I calculate?
1-Mass of fuel UO2 in reactor, kg
2-Total heat release rate in fuel, MW
3-Average fuel power density, kW/kg
4-Average core power density MW/m3
5-Average fuel rod heat flux kW/m2
6-Thermal power output based on coolant flow rate, MW
With below characteristics for a reactor:
Number of fuel assemblies in reactor 157
Number of fuel rods per assembly 264 (17X17 array)
Fuel rod cladding thickness 0.57mm
Fuel rod outside diameter 9.5 mm
Fuel rod lattice pitch 12.6mm
Fuel rod effective length 3.658m
Fuel pellet diameter 8.19mm
Equivalent reactor core diameter 3.040m
Average U-235 enrichment 2.8%
Effective U-235 fission cross section 360 barns
Uranium dioxide density 10400kg/m3
Average neutron flux 4.5x10e13 neutron/cm2s
Energy per fission 32pJ
Reactor coolant inlet temperature 286C
Reactor coolant outlet temperature 325C
Coolant flow rate through reactor core 12600kg/s
Coolant pressure 15.5Mpa
and 1 barn=10e-28 m2
I am a mechanical engineer. While my knowledge about archaeology is more than nuclear sciences I appreciate your guidance for solving following problem:
How can I calculate?
1-Mass of fuel UO2 in reactor, kg
2-Total heat release rate in fuel, MW
3-Average fuel power density, kW/kg
4-Average core power density MW/m3
5-Average fuel rod heat flux kW/m2
6-Thermal power output based on coolant flow rate, MW
With below characteristics for a reactor:
Number of fuel assemblies in reactor 157
Number of fuel rods per assembly 264 (17X17 array)
Fuel rod cladding thickness 0.57mm
Fuel rod outside diameter 9.5 mm
Fuel rod lattice pitch 12.6mm
Fuel rod effective length 3.658m
Fuel pellet diameter 8.19mm
Equivalent reactor core diameter 3.040m
Average U-235 enrichment 2.8%
Effective U-235 fission cross section 360 barns
Uranium dioxide density 10400kg/m3
Average neutron flux 4.5x10e13 neutron/cm2s
Energy per fission 32pJ
Reactor coolant inlet temperature 286C
Reactor coolant outlet temperature 325C
Coolant flow rate through reactor core 12600kg/s
Coolant pressure 15.5Mpa
and 1 barn=10e-28 m2





RE: Reactor
RE: Reactor
RE: Reactor
RE: Reactor
Heat release rate in fuel, MW
Fuel rod heat flux kW/m2
Average fuel power density, kW/kg
Thank you in advance for your comments
RE: Reactor
In that case, you probably need to go buy a nuclear engineering textbook. I'm not sure of the exact title of the one I have (as it's at home) but it was something like "Principles of Nuclear Engineering."
Patricia Lougheed
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RE: Reactor
Now, when you ask for 'heat release in fuel' do you mean, 'exclusive of heat generated in structure or coolant'? You see, some of the fission energy appears as gamma heating outside the fuel itself. If you are aware of this and wish to account for it, see vpl's post above ('get a nuclear engineering book'). If you are simply looking for the 'core power' then the (flow)x(enthalpy rise) above will be OK.
I notice you list 'reactor' inlet/outlet temperature. Do you mean 'vessel' inlet/outlet or 'core' inlet outlet? They are not necessarily identical, as there is usually a 'core bypass' flow that isn't heated by passing through the core. I ask because your flow rate is called 'core' flow. The enthalpy rise calc mentioned above must be done with the vessel temps & the vessel flow; or with the core temps and the core flow - if you mix these up you will get the wrong answer.
Once you have this total power, the other parameters are derived by dividing by total fuel length, surface area, mass etc.
RE: Reactor