Assessment of Two Wall Film Condensation Models of RELAP5/MOD3.2 in the Presence of Noncondensable Gas in a Vertical Tube

  • Published : 1999.10.01


The objective of the present work is to assess the analysis capability of two wall film condensation models, the default and the alternative models, of RELAP5/MOD3.2 on condensation experiments in the presence of noncondensable gas in a vertical tube of PCCS of CP-1300. In the calculation of a base case the default model of RELAP5/MOD3.2 under-predicts the heat transfer coefficients, and Its alternative model over-predicts them throughout the condensing tube, Also, both models over-predict the void fractions. The nodalization study shows that the variation of the node number does not change both modeling results of RELAP5/MOD3.2 Sensitivity study for varying input parameters shows that the inlet steam-air mixture flow rate, the inlet air mass fraction, and the inlet saturated steam temperature give significant changes of their heat transfer coefficients Run statistics show that the grind time of the default model is always higher than that of the alternative model by about 23%.


  1. Nuclear Engineering International v.12 Korea Looks Beyond the Next Generation S.H.Chang;H.C.NO;W.P.Baek;S.I.Lee;S.W.Lee
  2. Annals of Nuclear Energy v.24 no.6 Assessment of Passive Containment Cooling Concepts for Advanced Pressurized Water Reactors S.W.Lee;W.P.Baek;S.H.Chang
  3. Nuclear Technology v.124 no.2 Assessment and Improvement of Condensation Models in RELAP5/MOD3.2 K.Y.Choi;H.S.Park;S.J.Kim;H.C.NO;Y.S.Bang
  4. NUREG/CR-5535, INEL-95/0174 RELAP5/MOD3.2 Code Manual, Volume Ⅳ: Models and Correlations V.H.Ransom;J.A.Trapp;R.J.Wagner
  5. Nuclear Technology v.102 Local Heat Transfer Coefficients for Forced-Convection Condensation of Steam in a Vertical Tube in the Presence of a Noncondensable Gas M.Siddique;M.W.Golay;M.S.Kazimi
  6. PhD Thesis, Nuclear Engineering, University of California-Berkeley Investigation of Heat Transfer from Condensing Steam-Gas Mixtures and Trubulent Films Flowing Downward Inside a Vertical Tube S.Z.Kuhn
  7. NUREG/IA-0147 Assessment of RELAP5/MOD3.2 for Steam Condensation Experiments in the Presence of Noncondensables in a Vertical Tube of PCCS H.S.Park;H.C.NO;Y.S.Bang;K.W.Seul;H.J.Kim
  8. Z. Ver. Deutsch. Ing. v.60 The Surface Condensation of Water Vapor W.A.Nusselt
  9. Int. J. Heat Mass Transfer v.22 A General Correlation for Heat Transfer During Film Condensation Inside Tubes M.M.Shah
  10. Industrial and Engineering Chemistry v.26 no.11 Design of Cooler Condensers for Mixtures of Vapors with Non-Condensing Gases A.P.Colburn;O.A.Hougen
  11. Heat Mass and Momentum Transfer W.M.Rohsenow;Y.H.Choi
  12. Nuclear Technology v.119 Modification of Condensation Heat Transfer Model of RELAP5/MOD3.1 for the Simulation of Secondary Condensers H.T.Kim;H.C.NO
  13. Annals of Nuclear Energy v.24 no.7 Assessment of RELAP5/MOD3.1 for Direct-Contact Condensation in the Core Makeup Tank of the CARR Passive Reactor S.I.Lee;H.C.NO