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Remove self loops from sf decay_mode #3907

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Remove self loops from sf decay_mode #3907

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92c288e
remove self loops from sf decay_mode
eepeterson Mar 28, 2026
e50a0f3
use path_rate guard to not put explicit zeros into matrix
eepeterson Mar 28, 2026
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13 changes: 7 additions & 6 deletions openmc/deplete/chain.py
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Original file line number Diff line number Diff line change
Expand Up @@ -655,7 +655,7 @@ def setval(i, j, val):

# Allow for total annihilation for debug purposes
if branch_val != 0.0:
if target is not None:
if target is not None and 'sf' not in decay_type:
k = self.nuclide_dict[target]
setval(k, i, branch_val)

Expand Down Expand Up @@ -696,11 +696,12 @@ def setval(i, j, val):

# Determine light nuclide production, e.g., (n,d) should
# produce H2
light_nucs = REACTIONS[r_type].secondaries
for light_nuc in light_nucs:
k = self.nuclide_dict.get(light_nuc)
if k is not None:
setval(k, i, path_rate * br)
if path_rate != 0.0:
light_nucs = REACTIONS[r_type].secondaries
for light_nuc in light_nucs:
k = self.nuclide_dict.get(light_nuc)
if k is not None:
setval(k, i, path_rate * br)

else:
for product, y in fission_yields[nuc.name].items():
Expand Down
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