LOBI experimental program results and plans: status September 1982

The LOBI Project is being executed in the framework of an R and D contract between the Bundesminister fuer Forschung und Technologie, Bonn/FRG, and the Commission of the European Communities. The LOBI test facility was built and is operated by the EURATOM Joint Research Centre in Ispra, Italy; it is at present the only high-pressure integral system test facility in Europe for the investigation of pressurized water reactor loss-of-coolant accidents. The paper aims at highlighting the analysis results obtained until now from the LOBI Program by: (10 considering the influence of three important test parameters on blowdown, (2) showing the test predicting capability of the RELAP4/MOD6 code and (3) illustrating the importance of pump behavior simulation. The three test parameters investigated are: (1) the ECC water injection mode which was varied between cold leg injection, combined coal and hot leg injection and no injection at all, (2) the break size which ranged from 2 x 1A down to 1 x 0.25A, and (3) the downcomer gap width of 50 and 12 mm. A short outline of the presented status of the LOBI Project and of the plans for the forthcoming experimental program concludes the paper