# Difference between revisions of "Infinite homogeneous LWR-like reactor transient example"

From Serpent Wiki

(→Generating the steady state source distributions) |
(→Time dependent simulation (no reactivity insertion)) |
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== Time dependent simulation (no reactivity insertion) == | == Time dependent simulation (no reactivity insertion) == | ||

+ | |||

+ | <nowiki> | ||

+ | set title "Time dependent simulation, zero reactivity insertion" | ||

+ | |||

+ | % --- Geometry is just a cube | ||

+ | |||

+ | surf 2 cuboid -100.0 100.0 -100.0 100.0 -100.0 100.0 | ||

+ | |||

+ | % --- Cell definitions: | ||

+ | |||

+ | cell 3 0 fuel -2 | ||

+ | cell 99 0 outside 2 % Outside world | ||

+ | |||

+ | % --- Fuel material is a homogenized LWR material: | ||

+ | |||

+ | mat fuel sum vol 8.0000E+06 moder lwtr 1001 | ||

+ | 8016.03c 0.316667 | ||

+ | 1001.03c 0.633333 | ||

+ | 92235.03c 0.0015 | ||

+ | 92238.03c 0.0485 | ||

+ | 5010.03c 0.000115793 % 0$ reactivity insertion | ||

+ | |||

+ | % --- Thermal scattering data for hydrogen in light water (294 K) | ||

+ | |||

+ | therm lwtr lwj3.00t | ||

+ | |||

+ | % --- Reflective boundary condition: | ||

+ | |||

+ | set bc 2 2 2 | ||

+ | |||

+ | % --- Set up time structures for simulation and detectors: | ||

+ | |||

+ | % --- 30 time bins for detector | ||

+ | |||

+ | tme dettime 2 30 0 3e-3 | ||

+ | |||

+ | % --- 1 time interval for simulation (no population control) | ||

+ | |||

+ | tme simutime 2 1 0 3e-3 | ||

+ | |||

+ | % --- Increase the size of neutron buffer since there is no pop. control | ||

+ | |||

+ | set nbuf 10 | ||

+ | |||

+ | % --- Neutron population: | ||

+ | |||

+ | % --- 300k neutrons in 300 batches (1000 neutrons per batch) | ||

+ | |||

+ | set nps 60000000 6000 simutime | ||

+ | |||

+ | % --- Link source | ||

+ | |||

+ | set dynsrc "../crit/source" 1 | ||

+ | |||

+ | % --- Set up detectors: | ||

+ | |||

+ | % --- Tally neutron population as a function of time | ||

+ | |||

+ | det 1 dr -15 void di dettime | ||

+ | |||

+ | % --- Tally fission energy deposition as a function of time | ||

+ | |||

+ | det 2 dr -8 void di dettime | ||

+ | |||

+ | % --- Save neutron and precursor source to "./source_end"-files | ||

+ | |||

+ | set savesrc "./source_end" | ||

+ | |||

+ | % --- Do not generate group constants | ||

+ | |||

+ | set gcu -1 | ||

+ | |||

+ | % --- Do not use implicit capture, nxn, or fission | ||

+ | |||

+ | set impl 0 0 0 | ||

+ | </nowiki> | ||

== Time dependent simulation (0.85$ reactivity insertion) == | == Time dependent simulation (0.85$ reactivity insertion) == |

## Revision as of 17:25, 15 March 2016

## Generating the steady state source distributions

set title "Creating source for a time dependent simulation" % --- Geometry is just a cube surf 2 cuboid -100.0 100.0 -100.0 100.0 -100.0 100.0 % --- Cell definitions: cell 3 0 fuel -2 cell 99 0 outside 2 % Outside world % --- Fuel material is a homogenized LWR material: mat fuel sum vol 8.0000E+06 moder lwtr 1001 8016.03c 0.316667 1001.03c 0.633333 92235.03c 0.0015 92238.03c 0.0485 5010.03c 0.000115793 % --- Thermal scattering data for hydrogen in light water (294 K) therm lwtr lwj3.00t % --- Reflective boundary condition: set bc 2 2 2 % --- Set power level set power 1.0 % --- Neutron population: % --- Large population size: (produced approx. 60M neutron and 40M precursor source points) set pop 80000 80000 200 1.0 100 % --- Save neutron and precursor source to "./source"-files set savesrc "./source" % --- Do not generate group constants set gcu -1 % --- Do not use implicit capture, nxn, or fission set impl 0 0 0

## Time dependent simulation (no reactivity insertion)

set title "Time dependent simulation, zero reactivity insertion" % --- Geometry is just a cube surf 2 cuboid -100.0 100.0 -100.0 100.0 -100.0 100.0 % --- Cell definitions: cell 3 0 fuel -2 cell 99 0 outside 2 % Outside world % --- Fuel material is a homogenized LWR material: mat fuel sum vol 8.0000E+06 moder lwtr 1001 8016.03c 0.316667 1001.03c 0.633333 92235.03c 0.0015 92238.03c 0.0485 5010.03c 0.000115793 % 0$ reactivity insertion % --- Thermal scattering data for hydrogen in light water (294 K) therm lwtr lwj3.00t % --- Reflective boundary condition: set bc 2 2 2 % --- Set up time structures for simulation and detectors: % --- 30 time bins for detector tme dettime 2 30 0 3e-3 % --- 1 time interval for simulation (no population control) tme simutime 2 1 0 3e-3 % --- Increase the size of neutron buffer since there is no pop. control set nbuf 10 % --- Neutron population: % --- 300k neutrons in 300 batches (1000 neutrons per batch) set nps 60000000 6000 simutime % --- Link source set dynsrc "../crit/source" 1 % --- Set up detectors: % --- Tally neutron population as a function of time det 1 dr -15 void di dettime % --- Tally fission energy deposition as a function of time det 2 dr -8 void di dettime % --- Save neutron and precursor source to "./source_end"-files set savesrc "./source_end" % --- Do not generate group constants set gcu -1 % --- Do not use implicit capture, nxn, or fission set impl 0 0 0