Abstract
The JANUS Phase 7 shielding experiment performed in the NESTOR experimental reactor in 1991 studied deep fast neutron propagation in mild steel, boron carbide and sodium. Several steel plates, followed by boxes containing boron carbide and sodium were used as neutron shielding next to a fission plate. Gold, manganese, rhodium and sulphur detectors were positioned at several depths in order to measure the neutron flux at different energies. This experiment is interpreted using the Monte-Carlo code TRIPOLI-4® and different nuclear data for iron 56 and sodium. C/E results exhibit discrepancies generally smaller than 10% for the gold detector, while larger discrepancies are obtained for the sulphur detector. In order to understand the obtained biases, sensitivity calculations were performed to compute the uncertainties on the detector responses due to nuclear data. We show that the propagated uncertainties may explain a large part of the observed discrepancies.
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