SYMPOSIA PAPER Published: 01 January 1994

“Concrete Benchmark” Experiment as Support to Ex-Vessel LWR Surveillance Dosimetry


The analysis of DOEL-1 in-vessel and ex-vessel neutron dosimetry, using the DOT 3.5 Sn code coupled with the VITAMIN-C cross-section library, showed the same C/E values for different detectors at the surveillance capsule and the ex-vessel cavity positions. These results seem to be in contradiction with those obtained in several benchmark experiments (PCA, PSF, VENUS ...) that used the same computational tools. Indeed a strong decreasing radial trend of the C/E was observed, partly explained by the overestimation of the iron inelastic scattering. The flat trend seen in DOEL-1 could be explained by compensating errors in the calculation such as the backscattering due to the concrete walls outside the cavity. The “Concrete Benchmark” experiment has been designed to judge the ability of this calculational method to treat the backscattering.

This paper describes the “Concrete Benchmark” experiment, the measured and computed neutron dosimetry results and their comparison. This preliminary analysis seems to indicate an overestimation of the backscattering effect in the calculations.

Author Information

Abderrahim, HA
SCK/CEN, MOL, Belgium
D‘hondt, PJ
SCK/CEN, MOL, Belgium
Risch, P
EDF, Clamart Cedex, France
Oeyen, JB
SCK/CEN, MOL, Belgium
Bioux, P
EDF, Clamart Cedex, France
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Developed by Committee: E10
Pages: 392–400
DOI: 10.1520/STP15133S
ISBN-EB: 978-0-8031-5281-6
ISBN-13: 978-0-8031-1899-7