# Copyright 2019 TerraPower, LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
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"""Graphite is often used as a moderator in gas-cooled nuclear reactors."""
from armi.materials.material import Material
from armi.utils import units
from armi.nucDirectory import thermalScattering as tsl
from armi.nucDirectory import nuclideBases as nb
[docs]class Graphite(Material):
"""
Graphite.
.. [INL-EXT-16-38241] McEligot, Donald, Swank, W. David, Cottle, David L., and Valentin,
Francisco I. Thermal Properties of G-348 Graphite. United States: N. p., 2016. Web. doi:10.2172/1330693.
https://www.osti.gov/biblio/1330693
"""
thermalScatteringLaws = (tsl.byNbAndCompound[nb.byName["C"], tsl.GRAPHITE_10P],)
[docs] def setDefaultMassFracs(self):
"""
Set graphite to carbon.
Room temperature density from [INL-EXT-16-38241]_, table 2.
"""
self.setMassFrac("C", 1.0)
self.refDens = 1.8888
[docs] def linearExpansionPercent(self, Tk=None, Tc=None):
"""
This is dL/L0 for graphite.
From [INL-EXT-16-38241]_, page 4.
"""
Tc = units.getTc(Tc, Tk)
return 100 * (-1.454e-4 + 4.812e-6 * Tc + 1.145e-9 * Tc**2)