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The evaluation of validity of the RELAP5/Mod3 flow regime map for horizontal small diameter tubes at low pressure

Abstract

RELAP5/MOD3 code was developed for Western type power water reactors with vertical steam generators. Thus, this code should be validated also for WWER design with horizontal steam generators. In application for horizontal steam generators the situation with two-phase flow inside small diameter tubes is possible when the first circuit pressure drops in accident below the pressure level in the boiling water. It is known that computer codes have not always modelled correctly the two-phase flow inside horizontal tubes at low pressures (less than 4-6 MPa). It may be the result of erroneous prediction of the flow regime. Correct prediction of the flow regime is especially important for the fully or partly stratified flow in horizontal tubes. The aim of this study is the attempt of verification of the flow regime map, which is used in the RELAP5/MOD3 computer code for two-phase flow in horizontal small diameter tubes. `Small diameter tube` means according RELAP5/MOD3 that the inner diameter of the tube is less (or equal) than 0.018 m. The inner tube diameter in horizontal steam generators is equal 0.013 m. (orig.). 19 refs.
Authors:
Agafonova, N; [1]  Banati, J [2] 
  1. St. Petersburg State Technical Univ. (Russian Federation)
  2. Lappeenranta Univ. of Technology (Finland)
Publication Date:
Dec 31, 1997
Product Type:
Conference
Report Number:
LTKK-TJ-67; CONF-9703151-
Reference Number:
SCA: 210200; PA: AIX-29:024680; EDB-98:048765; SN: 98001958621
Resource Relation:
Conference: 4. international seminar on horizontal steam generators, Lappeenranta (Finland), 11-13 Mar 1997; Other Information: DN: 19 refs.; PBD: 1997; Related Information: Is Part Of Fourth international seminar on horizontal steam generators; Tuomisto, H. [ed.] [IVO Group, Vantaa (Finland)]; Purhonen, H. [ed.] [VTT, Espoo (Finland)]; Kouhia, V. [ed.] [Lappeenranta Univ. of Technology (Finland)]; PB: 305 p.
Subject:
21 NUCLEAR POWER REACTORS AND ASSOCIATED PLANTS; COMPUTERIZED SIMULATION; PRESSURE DEPENDENCE; R CODES; STEAM GENERATORS; TUBES; TWO-PHASE FLOW; VERIFICATION; WWER TYPE REACTORS
OSTI ID:
605575
Research Organizations:
Lappeenranta Univ. of Technology (Finland).
Country of Origin:
Finland
Language:
English
Other Identifying Numbers:
Other: ON: DE98621567; ISBN 951-764-189-3; TRN: FI9800029024680
Availability:
INIS; OSTI as DE98621567
Submitting Site:
FIN
Size:
pp. 111-121
Announcement Date:
Jun 10, 1998

Citation Formats

Agafonova, N, and Banati, J. The evaluation of validity of the RELAP5/Mod3 flow regime map for horizontal small diameter tubes at low pressure. Finland: N. p., 1997. Web.
Agafonova, N, & Banati, J. The evaluation of validity of the RELAP5/Mod3 flow regime map for horizontal small diameter tubes at low pressure. Finland.
Agafonova, N, and Banati, J. 1997. "The evaluation of validity of the RELAP5/Mod3 flow regime map for horizontal small diameter tubes at low pressure." Finland.
@misc{etde_605575,
title = {The evaluation of validity of the RELAP5/Mod3 flow regime map for horizontal small diameter tubes at low pressure}
author = {Agafonova, N, and Banati, J}
abstractNote = {RELAP5/MOD3 code was developed for Western type power water reactors with vertical steam generators. Thus, this code should be validated also for WWER design with horizontal steam generators. In application for horizontal steam generators the situation with two-phase flow inside small diameter tubes is possible when the first circuit pressure drops in accident below the pressure level in the boiling water. It is known that computer codes have not always modelled correctly the two-phase flow inside horizontal tubes at low pressures (less than 4-6 MPa). It may be the result of erroneous prediction of the flow regime. Correct prediction of the flow regime is especially important for the fully or partly stratified flow in horizontal tubes. The aim of this study is the attempt of verification of the flow regime map, which is used in the RELAP5/MOD3 computer code for two-phase flow in horizontal small diameter tubes. `Small diameter tube` means according RELAP5/MOD3 that the inner diameter of the tube is less (or equal) than 0.018 m. The inner tube diameter in horizontal steam generators is equal 0.013 m. (orig.). 19 refs.}
place = {Finland}
year = {1997}
month = {Dec}
}