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International audienceFLUOLE-2 is a benchmark-type experiment dedicated to 900 and 1450MWePWR vessels surveillance dosimetry. This two-year program started in 2014 and will end in2015. It will provide precise experimental data for the validation of the neutron spectrumpropagation calculation from core to vessel. It is composed of a square core surrounded bya stainless steel baffle and internals: PWR barrel is simulated by steel structures leading todifferent steel-water slides; two steel components stand for a surveillance capsule holderand for a part of the pressure vessel. Measurement locations are available on the wholeexperimental structure. The experimental knowledge of core sources will be obtained byintegral gamma scanning measurements directly on fuel pins. Reaction rates measuredby calibrated fission chambers and a large set of dosimeters will give information on theneutron energy and spatial distributions. Due to the low level neutron flux of EOLE ZPRa special, high efficiency, calibrated gamma spectrometry device will be used for somedosimeters, allowing to measure an activity as low as 7. 10−2 Bq per sample. 103mRhactivities will be measured on an absolute calibrated X spectrometry device. FLUOLE-2experiment goal is to usefully complete the current experimental benchmarks database usedfor the validation of neutron calculation codes. This two-year program completes the initialFLUOLE program held in 2006–2007 in a geometry representative of 1300MWe PWR

FLUOLE-2: An Experiment for PWR Pressure Vessel Surveillance