Analytical measurements of fission products during a severe nuclear accident
Den-Service d’Etude du Comportement des Radionucléides (SECR), CEA, Université Paris-Saclay, F-91191, Gif-sur-Yvette, France.
2 Société Civile Synchrotron SOLEIL, L’Orme des Merisiers, St-Aubin BP48, 91192 Gif-sur-Yvette Cedex, France.
3 MONARIS, UMR 8233, Université Pierre et Marie Curie, 4 Place Jussieu, case 49, F-75252 Paris Cedex 05, France.
4 LMD UMR 8539, ARA/ABC(t)/LMD/IPSL Ecole Polytechnique RD 36, 91128 Palaiseau Cedex, France.
5 Laboratoire Interdisciplinaire Carnot de Bourgogne, UMR 6303 CNRS-Université de Bourgogne, 9 avenue Alain Savary, BP 47870, F-21078 Dijon Cedex, France.
6 Service de Chimie Quantique et Photophysique C.P. 160/09 Université Libre de Bruxelles, 50 avenue F.D. Roosevelt - 1050 Bruxelles - Belgique
7 Laboratoire Inter-Universitaire des Systèmes Atmosphériques (LISA), UMR 7583, CNRS et Universités Paris Est et Paris Diderot, Institut Paul Simon Laplace, 61 Av. du Général de Gaulle, 94010 Créteil, France.
Published online: 10 January 2018
The Fukushima accident emphasized the fact that ways to monitor in real time the evolution of a nuclear reactor during a severe accident remain to be developed. No fission products were monitored during twelve days; only dose rates were measured, which is not sufficient to carry out an online diagnosis of the event. The first measurements were announced with little reliability for low volatile fission products. In order to improve the safety of nuclear plants and minimize the industrial, ecological and health consequences of a severe accident, it is necessary to develop new reliable measurement systems, operating at the earliest and closest to the emission source of fission products. Through the French program ANR « Projet d’Investissement d’Avenir », the aim of the DECA-PF project (diagnosis of core degradation from fission products measurements) is to monitor in real time the release of the major fission products (krypton, xenon, gaseous forms of iodine and ruthenium) outside the nuclear reactor containment. These products are released at different times during a nuclear accident and at different states of the nuclear core degradation. Thus, monitoring these fission products gives information on the situation inside the containment and helps to apply the Severe Accident Management procedures. Analytical techniques have been proposed and evaluated. The results are discussed here.
Key words: severe accident / fission products / xenon / krypton / iodine / ruthenium / molecular spectroscopy
© The Authors, published by EDP Sciences, 2018