RELAP5 Code Validation in the Framework of the LACANES OECD/NEA Benchmark for HLM Innovative Nuclear System
The increasing interest for Heavy Liquid Metal innovative nuclear systems has generated the need to develop a Thermo-Hydraulic system codes able to treat such cooling fluids, both for transient and accident analysis. ENEA/ANSALDO have had the idea to adapt the extensively validate and worldwide used T/H code, RELAP5, to this purpose. The code, developed for LWR LOCA analysis, based on a 6-equations -2-fluid model describing mass, momentum and energy balances of separated steam and liquid phases, was modified generating the physical and thermodynamics properties both for Pb, Pb-Bi (soft sphere model) and for diathermic Oil, and updating several original routines in order to implement suitable correlations for heavy liquid metal. In particular specific heat transfer correlations were added: convective heat transfer for heavy liquid metals, evaluated according to Seban-Shimazky (pipe) or Subbotin-Ushakov (tube bundle), and for oil helical path (Gnielinsky).The modifications have been validated against available experimental data. In the framework of LACANES OECD/NEA benchmark the code is being utilized to simulate the thermal-hydraulic behaviour of the Pb-Bi loop HELIOS both in forced and in natural conditions. In the first phase of the benchmark two different forced circulation steady states have been considered in order to assess the distributed and local pressure drops calculated by RELAP5. The calculation results have shown a quite agreement with the experimental data, a further refine of calculation has been obtained with a calibration, on experimental data of the concentrate pressure drop coefficients adopted for the more complex component geometries. Finally, some scope calculations have been performed with the upgraded model to characterize the natural circulation in the loop.
Thermo-hydraulic Liquid Metals Lead-bismuth Relap5 LACANES
Francesco Saverio Nitti Paride Meloni
ENEA Centro Ricerche Brasimone Località Brasimone 40032 Camugnano (Bologna),Italy ENEA Centro Ricerche “Ezio Clementel via Martiri di Monte Sole 40100 Bologna, Italy
国际会议
上海
英文
642-653
2010-10-10（万方平台首次上网日期，不代表论文的发表时间）