OpenMC MSBR model and data

doc/releasenotes/v0.5.0.rst

@@ -54,6 +54,7 @@ New Features
   Describe any new features to the code.
 
 - ``openmc`` support via `DepcodeOpenMC`
+- OpenMC compatible MSBR model.
 
 
 
@@ -81,7 +82,9 @@ Script Changes
   - Add ``SERPENT_DATA`` and ``SERPENT_ACELIB`` variables to ``.bashrc``
 
 - A new script, ``scripts/ci/openmc-xs.bash``, that downloads the OpenMC HDF5 cross section library.
-
+- A new script, ``download_endfb71.bash``, that downloads the ENDF/B 7.1 cross section library -- including thermal scattering, decay, and fission yield data -- in ACE format.
+- A new script, ``process_endfb71_to_openmc.bash``, that converts the library created by ``download_endfb71.bash`` into an OpenMC-usable HDF5 format. Requires OpenMC to be installed from source to use.
+- A new script ``openmc_msbr_model.py``, that creates an OpenMC-usable MSBR model based on the Serpent MSBR model.
 
 
 Python API Changes

examples/msbr/README.md

@@ -0,0 +1,27 @@
+## MSBR Model
+
+This model is based on the following technical report:
+
+Robertson, R. C. (1971). Conceptual Design Study of a Single-Fluid Molten-Salt Breeder Reactor. (ORNL--4541). ORNL.
+
+For a complete discussion of the model, please see Chapter 4 in:
+
+Yardas, O. (2023). Implementation and validation of OpenMC in SaltProc [MS Thesis, University of Illinois at Urbana-Champaign].
+
+
+## Key features
+- Zone IB 
+- Zone IIA
+- Simplified Zone IIB (graphite slabs are constructed from cylindrical sectors, and so do not have a consistent width; the last gap in the ccw direction in each octant is smaller than the other gaps, which all have the same dimension)
+- Control rod elements (A Guess, as no spec was provided)
+- Radial reflectors.
+- Simplified axial reflectors (flat as opposed to dished in the reference specification)
+
+## Missing from model
+- Zone IA
+- Support structure above the main core
+- Radial reflector axial ribs
+- Radial reflector retaining rings
+- Zone IIB Graphite Dowel pins and Hastelloy N eliptical pins
+- Salt inlets and outlest
+- Zone I eliptical graphite sealing pins

examples/msbr/control_rods.py

@@ -0,0 +1,103 @@
+import openmc
+import numpy as np
+
+def control_rod(gr_sq_neg,
+                gr_extra_regions,
+                inter_elem_channel,
+                fuel_hole,
+                fuel,
+                moder):
+    """Create universe for control rod element with control rod fully inserted.
+    Based on specification in Roberton, 1971.
+
+    Parameters
+    ----------
+    gr_sq_neg : openmc.Intersection
+        The region bounding the outer surface of the 6 in. x 6 in. graphite
+        element.
+    gr_extra_regions : list of (openmc.Region, str)
+        'Add-on' regions and their names for the graphite element.
+        Includes ribs, rib tips, and gap-filling regions.
+    inter_elem_channel : openmc.Region, list of (openmc.Region, str)
+        Inter-element channel region(s).
+    fuel_hole : openmc.ZCylinder
+        Central fuel hole in graphite element.
+    fuel : openmc.Material
+        Fuel salt material
+    moder : openmc.Material
+        Graphite material
+
+    Returns
+    -------
+    cr : openmc.Universe
+        Univerese for control rod element with control rod fully insterted.
+    """
+
+    s1 = openmc.ZCylinder(r=4.7625, name='control_rod')
+
+    c1 = openmc.Cell(fill=moder, region=-s1, name='control_rod')
+    c2 = openmc.Cell(fill=fuel, region=(+s1 & -fuel_hole), name='cr_fuel_inner')
+    c3 = openmc.Cell(fill=moder, region=(+fuel_hole &
+                                         gr_sq_neg &
+                                         inter_elem_channel),
+                     name='cr_moderator')
+    c4 = openmc.Cell(fill=fuel, region= (~gr_sq_neg & inter_elem_channel),
+                     name='cr_fuel_outer')
+    #universe_id=3
+    cr = openmc.Universe(name='control_rod', cells=[c1, c2, c3, c4])
+
+    for (reg, name) in gr_extra_regions:
+            cr.add_cell(openmc.Cell(fill=moder, region=reg,
+                                    name=f'cr_moderator_{name}'))
+
+    return cr
+
+def control_rod_channel(gr_sq_neg,
+                        gr_extra_regions,
+                        inter_elem_channel,
+                        fuel_hole,
+                        fuel,
+                        moder):
+    """Create universe for control rod element with control rod fully withdrawn.
+    Based on specification in Roberton, 1971.
+
+    Parameters
+    ----------
+    gr_sq_neg : openmc.Intersection
+        The region bounding the outer surface of the 6 in. x 6 in. graphite
+        element.
+    gr_extra_regions : list of (openmc.Region, str)
+        'Add-on' regions and their names for the graphite element.
+        Includes ribs, rib tips, and gap-filling regions.
+    inter_elem_channel : openmc.Region, list of (openmc.Region, str)
+        Inter-element channel region(s).
+    fuel_hole : openmc.ZCylinder
+        Central fuel hole in graphite element.
+    fuel : openmc.Material
+        Fuel salt material
+    moder : openmc.Material
+        Graphite material
+
+    Returns
+    -------
+    crc : openmc.Universe
+        Universe for control rod element with control rod fully withdrawn.
+    """
+
+    c1 = openmc.Cell(fill=fuel, region=(-fuel_hole), name='crc_fuel_inner')
+
+    c2 = openmc.Cell(fill=moder, region=(+fuel_hole &
+                                         gr_sq_neg &
+                                         inter_elem_channel),
+                     name='crc_moderator')
+    c3 = openmc.Cell(fill=fuel, region=(~gr_sq_neg & inter_elem_channel),
+                     name='crc_fuel_outer')
+
+    # universe_id=4
+    crc = openmc.Universe(name='control_rod_channel', cells=[c1, c2, c3])
+
+    for (reg, name) in gr_extra_regions:
+        crc.add_cell(openmc.Cell(fill=moder, region=reg,
+                                 name=f'crc_moderator_{name}'))
+
+    return crc