RELAP-7 Progress Report. FY-2015 Optimization Activities Summary

Berry, Ray Alden¹  Zou, Ling¹  Andrs, David¹ 

[1] Idaho National Lab. (INL), Idaho Falls, ID (United States)

关键词: R CODES;    PROGRESS REPORT;    TWO-PHASE FLOW;    ENTROPY;    WATER;    EQUILIBRIUM;    EVALUATION;    OPTIMIZATION;    STABILIZATION;    STEAM;    VISCOSITY;    NUMERICAL SOLUTION Entropy Viscosity Method;    RELAP-7 Closure Relations;    RELAP-7 Equation of State;   

DOI  :  10.2172/1244637
RP-ID  :  INL/EXT--15-36771
PID  :  OSTI ID: 1244637
Others  :  TRN: US1601060

美国|英语

来源: SciTech Connect

【 摘 要 】

This report summarily documents the optimization activities on RELAP-7 for FY-2015. It includes the migration from the analytical stiffened gas equation of state for both the vapor and liquid phases to accurate and efficient property evaluations for both equilibrium and metastable (nonequilibrium) states using the Spline-Based Table Look-up (SBTL) method with the IAPWS-95 properties for steam and water. It also includes the initiation of realistic closure models based, where appropriate, on the U.S. Nuclear Regulatory Commission???s TRACE code. It also describes an improved entropy viscosity numerical stabilization method for the nonequilibrium two-phase flow model of RELAP-7. For ease of presentation to the reader, the nonequilibrium two-phase flow model used in RELAP-7 is briefly presented, though for detailed explanation the reader is referred to RELAP-7 Theory Manual [R.A. Berry, J.W. Peterson, H. Zhang, R.C. Martineau, H. Zhao, L. Zou, D. Andrs, ???RELAP-7 Theory Manual,??? Idaho National Laboratory INL/EXT-14-31366(rev. 1), February 2014].