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FP5

The MUSE experiments for sub critical neutronics validation, Final report

Project ID: FIKW-CT-2000-00063
Funded under: FP5-EAECTP C

Abstract

Neutronic experiments and studies have largely been carried out in the past for fast critical reactors. The associated calculation tools developed for the predictions of such systems have been mainly based on integral experiments in critical reactor facilities. Experimental techniques have also been developed that are directly applied to power producing critical operating systems.
The same approach for studying neutronics of sub-critical systems driven by an external source is based on the decoupling of the validation of the sub-critical multiplying medium behaviour from that of the validation of the external source characteristics. Following this scheme, two major programmes have been carried out in the MUSE project from 2000 to 2004: the MUSE-4 programme (Cadarache, F) and the PRE-SAD experiments (Dubna, RF).
The objectives of the MUSE-4 programme [1] were (1) to operate a fast subcritical core coupled to an external neutron source simulating the spallation source of an ADS without feedback effects, (2) to characterize such a system providing experimental input data for calculation tool validation and (3) to investigate techniques and analysis methods for sub-critical measurement and monitoring. With regard to the PRE-SAD experiments [2], the main objectives were (1) to determine experimentally the characteristics of hadron field around a bare spallation target bombarded by a high energy proton beam, (2) to measure the nuclides produced in the target and simulate these experiments using various codes and model option and (3) to examine the influence of core, reflector and shielding parameters of the SAD [3] core versions on its experimental properties and the possibilities to infer accurately the reactivity level.

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