WIMS Library Update Project

Burnup benchmarks

1) NPD. 19-rod Fuel Clusters

D2O-moderated uranium oxide lattices.

Analysis of Isotopic Composition as function of burnup

Laboratory: AECL Atomic Energy of Canada Limited (Canada)

Facility: NPD Nuclear Power Demonstration reactor

NPD is a Canadian demonstration PHWR (25 MW electrical power) shut
down on 1987. The moderator and coolant were heavy water. The fuel
was in the form of 19 natural UO2 rod CANDU type clusters.

Isotopic measurements of irradiated 19 element fuel bundles have been done
in 1971 at the CEA in France. The measurements included a series of eight
bundles with irradiation in the range 1000-10000 MWd/TU which were analysed
by mass-spectroscopy.

2) NEA Burnup Credit Criticality Benchmark

LWR-Burnup credit criticality benchmark. Isotopic composition prediction

Laboratory: Pacific Northwest Laboratory, Richland, Washington (USA)

This benchmark compares the computed nuclide inventories for a simple pin cell
calculation. The fuel and operating specifications are based on data given
in the references for the Combustion Engineering (CE) 14 x 14 assembly designated
as Approved Testing Material ATM-104, for a series of experiments designed to
characterize spent fuel for light water reactors. The chemical assay data measured
in these experiments are of particular value in validating the isotopic predictions used
in burnup credit.

Data

Operating history data for isotopic calculation

BURN is the fuel irradiation time

DOWN is the downtime between cycles except for cycle 4 where it
includes the decay time from reactor to measurement (cooling time)

BORON is the cycle-average boron concentration as a percent of
the cycle 1 concentration

Specific power

Initial fuel number densities

Cycle 1 coolant number densities

3) LWR-Pu recycling benchmarks

LWR-Pu recycling benchmarks

These numerical benchmarks compare the computed nuclide inventories for simple pin
cell calculations, for two cases:

A) highly degraded plutonium, and
B) normal recycled plutonium.

Reference results Isotopic concentrations (mg/g fuel) on the fuel pin for:

U-234, U-235,U-236, U-238, Np-237, Pu-238, Pu-239, Pu-240, Pu-241,Pu-242, Am-241,
Am-242m,Am-243, Cm-242, Cm-243, Cm-244, Cm-245, Mo-95, Tc-99, Ru-101, Rh-103,
Pd-105, Pd-107,Pd-108, Ag-109, Xe-131, Xe-135, Cs-133, Cs-135, Nd-143, Nd-145, Pm-147,
Pm-148m,Sm-149, Sm-150, Sm-151, Sm-152, Eu-153, Eu-154, Eu-155,
for cases A and B, at 50 GWd/MTU burnup.

Calculated ParametersIsotopic concentrations (mg/g fuel) on the fuel pin for:

U-234, U-235, U-236, U-238, Np-237, Pu-238, Pu-239, Pu-240, Pu-241,Pu-242, Am-241,
Am-242m, Am-243, Cm-242, Cm-243, Cm-244, Mo-95, Tc-99, Ru-101, Rh-103, Pd-105,
Pd-107, Pd-108, Ag-109, Xe-131, Xe-135, Cs-133, Cs-135, Nd-143, Nd-145, Pm-147,
Pm-148m, Sm-149, Sm-150, Sm-151, Sm-152, Eu-153,Eu-154, Eu-155
for cases A and B, at 50 GWd/MTU burnup.

Data