Feasibility Study for an Engineering Concept in a Stainless-Steel Copper Divertor Plate Protected by Tungsten-5% Rhenium Alloy or Graphite

Abstract

THE PRESENT PROPOSAL OF THE NEW DIVERTOR PANEL CONCEPT MAY BE CONSIDERED AS AN EVOLUTION OF THE PREVIOUS STUDIES CARRIED OUT AT JRC-ISPRA, AND IT IS INTENDED TO BE A GLOBAL PROPOSAL ABLE TO SATISFY THE REQUIREMENTS OF THE TECHNOLOGICAL FEASIBILITY, THE ENGINEERING DESIGN, THE RELIABILITY AND THE ACCEPTANCE FROM SAFETY AND LICENSING AUTHORITIES. THE MATERIALS CONSIDERED IN THIS STUDY ARE STAINLESS-STEEL (AISI 316) FOR THE COOLING TUBES, PURE COPPER FOR THE HEAT SINK, TUNGSTEN-5% RHENIUM ALLOY OR GRAPHITE FOR THE PROTECTIVE ARMOUR. THE COOLING OF THE PANEL IS ACHIEVED BY PRESSURIZED WATER CIRCULATING IN U-TUBES. A PRELIMINARY THERMOHYDRAULIC ANALYSIS HAS BEEN CARRIED OUT IN ORDER, TO EVALUATE A SET OF REFERENCE PARAMETERS SUCH AS OPTIMUM COOLANT VELO- CITY, MAXIMUM OUTLET WATER TEMPERATURE, CONVECTIVE HEAT EXCHANGE COEFFICIENT, AND THE EXPECTED PRESSURE DROPS IN THE CHANNELS. THE THERMAL AND THE MECHANI- CAL CALCULATIONS HAVE BEEN PERFORMED BY USING THE FINITE ELEMENT TECHNIQUE AND ASSUMING THE ASME CODE AS A GUIDE FOR THE DESIGN. SEVERAL GEOMETRIC AND MATE-ASRIAL RELATED EFFECTS HAVE BEEN TAKEN INTO ACCOUNT WITH PARTICULAR REFERENCE TO RIAL RELATED EFFECTS HAVE BEEN TAKEN INTO ACCOUNT WITH PARTICULAR REFERENCE TOTHE HEAT TRANSFER PERFORMANCE OF THE COMPONENT AND THE CONSEQUENT TEMPERATURE AND STRESS DISTRIBUTIONS. THE RESULTS OF THESE PRELIMINARY ELASTIC CALCULA- TIONS HAVE SHOWN THE ENGINEERING FEASIBILITY OF THE DIVERTOR FOR LOADING CONDITIONS SIMILAR TO THOSE OF NET DOUBLE NULL ASSUMED AS REFERENCE MAINFRAME.NA-NOT AVAILABL