Intercomparison test of various aerosol measurement techniques for sodium fire aerosols

The objective of the aerosol measurement workshop was to assess to applicability and reliability of specific aerosol measuring instruments for sodium fire studies. The aerosol experts participating in the exercise agreed to concentrate on the techniques of measuring aerosol particle size distributions. The tests were performed using the aerosol loop at the FAUNA test facility KFK. A sodium spray fire was produced under open-loop conditions to give a continuous aerosol source of variable concentration. Measurements performed with equipment from the participating laboratories were evaluated using a standard procedure, enabling an estimate to be made of the accuracy of the experimental data. These results can be used as input data for the mathematical modelling of aerosol behaviour in computer codes, and the work reported here is a contribution to the definition of the radioactive source term for severe accidents in LMFBRs. (orig./HP)