Proceedings of the 4th MEGAPIE (MEGAwatt PIlot Experiments) technical review meeting

Abstract

The fourth technical review meeting of the MEGAwatt PIlot Experiment (MEGAPIE) took place on 18-19 March, 2003 in Paris, in coincidence with the finalisation of the detailed design and the launching of the manufacturing phase (phase 5) of the project. The present volume contains the proceedings of this technical review meeting. The 36 contributions presented at the meeting, coming from Europe, USA, Japan and Korea, pointed out once more the international frame of the initiative, which is supported by six European research institutions (PSI, CEA, FZK, CNRS, ENEA, SCK), by JAERI (Japan), DOE (USA) and KAERI (Korea). The design of the Ancillary systems (Heat Removal System (HRS)), Cover Gas System (CGS), Liquid Metal Fill and Drain (F and D) System and Insulating Gas System (IGS) is also progressing. In particular the reference solution for the CGS is to periodically drain the gas in a decay tank. Safety and licensing issues were also addressed. Examples are the focused beam transient and the thermal shock transient. For both cases CFD calculations and stress analysis were performed. In the frame of the thermal hydraulic and structural mechanics task, a large amount of CFD calculations and stress analysis have been performed according to the needs expressed by the designers. At the meeting the following topics were presented: (a) RELAP 5 Analysis of the MEGAPIE target thermal hydraulics in steady state and transient conditions; (b) CFD simulation on the heat deposition distribution in the target; (c) Stress analysis of the liquid metal container under normal operating conditions; (d) the HYTAS water experiment, performed to investigate the cooling characteristics of the MEGAPIE beam window and the 3D-CFD simulations associated to the experiment; (e) the LBE KILOPIE and Heated Jet experiments, both under preparation; The Neutronics and Nuclear Assessment task group has performed detailed benchmark exercises and a compilation was produced. During the meeting it was agreed to the use MCNPX and FLUKA codes as reference tools for the project. Materials radiation damage task group has produced data on the mechanical properties of T91 steel at high temperature. These data were used for the safety analysis. In addition, an attempt was made to estimate the window lifetime using DBTT as a criterion. Compatibility tests on bare and welded T91 steel were performed in the frame of the solid - liquid interface task. Tests were performed at the laboratories of different associations, and a comprehensive compilation of the results seems to be mandatory. Progress in the LISOR experiments was shown. In fact a successful assembling and disassembling of the LISOR test section has been shown. In addition, tensile test on T91 exposed for 24 h at 300 C and irradiated for one hour did show ductile fracture mode. (orig.)SIGLEAvailable from TIB Hannover: ZA5141(6876) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman