The present paper deals with the post test analysis of PKL III E3.1 experiment by Relap5. This experiment has been executed in the framework of an international cooperation (OECD/SETH Project in the Integral Test Facility (ITF) PKL III which is operated by AREVA NP GmbH in Erlangen, Germany. The main purpose of the project is to investigate PWR safety issues related to boron dilution. In particular this experiment investigates the boron dilution issue during mid-loop operation (shutdown conditions), assessing primary circuit accident management operations to prevent boron dilution as a consequence of loss of heat removal in mid-loop operation conditions. The experiment has been also selected for an international benchmark in the framework of OECD Project. The adopted nodalization, already available at University of Pisa (UNIPI), has been review and applied adopting the standard procedure used for code validation.
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