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Study of two-phase flow under low velocity in PWR-LOCA

Technical Report:

Abstract

In this research, when the hydrothermal behavior at the time of LOCA in PWRs is forecast with high accuracy by the optimal forecast code based on a two-fluid model, there are some problems in the accuracy of forecast of low velocity two-phase flow, therefore, the subjects related to it were studied. The subjects are the forecast using the multi-dimensional optimal forecast code of the heat transfer acceleration phenomena in high power output fuel assemblies originating in the radial power distribution in a core in the reflooding period at the time of LOCA, the evaluation of the applicability of the hydrothermal model in a core in reflooding period which was developed for 15 x 15 type fuel assemblies to 17 x 17 type fuel assemblies, the grasping of the mechanism of opposite flow limiting phenomena in hot leg, the elucidation of the scale effect of channels and the development of a model which is applicable up to actual reactor scale. The studies carried out on these subjects and the conclusions of respective studies are reported. (K.I.) 79 refs.
Authors:
Ohnuki, Akira [1] 
  1. Japan Atomic Energy Research Inst., Tokai, Ibaraki (Japan). Tokai Research Establishment
Publication Date:
Oct 01, 1992
Product Type:
Technical Report
Report Number:
JAERI-M-92-150
Reference Number:
SCA: 220900; 210200; PA: JPN-92:012232; SN: 93000919934
Resource Relation:
Other Information: PBD: Oct 1992
Subject:
22 GENERAL STUDIES OF NUCLEAR REACTORS; 21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS; PWR TYPE REACTORS; REACTOR SAFETY; LOSS OF COOLANT; TWO-PHASE FLOW; VELOCITY; ACCURACY; FLOW MODELS; COMPUTER CODES; POWER DISTRIBUTION; FUEL ASSEMBLIES; HEAT TRANSFER; SCALE MODELS; VOID FRACTION; COUNTER CURRENT; FILM BOILING; FUEL RODS; FUEL CANS; FORECASTING; 220900; 210200; POWER REACTORS, NONBREEDING, LIGHT-WATER MODERATED, NONBOILING WATER COOLED
OSTI ID:
10112643
Research Organizations:
Japan Atomic Energy Research Inst., Tokyo (Japan)
Country of Origin:
Japan
Language:
Japanese
Other Identifying Numbers:
Other: ON: DE93754367; TRN: JP9212232
Availability:
OSTI; NTIS; INIS
Submitting Site:
JPN
Size:
146 p.
Announcement Date:
Jun 30, 2005

Technical Report:

Citation Formats

Ohnuki, Akira. Study of two-phase flow under low velocity in PWR-LOCA. Japan: N. p., 1992. Web.
Ohnuki, Akira. Study of two-phase flow under low velocity in PWR-LOCA. Japan.
Ohnuki, Akira. 1992. "Study of two-phase flow under low velocity in PWR-LOCA." Japan.
@misc{etde_10112643,
title = {Study of two-phase flow under low velocity in PWR-LOCA}
author = {Ohnuki, Akira}
abstractNote = {In this research, when the hydrothermal behavior at the time of LOCA in PWRs is forecast with high accuracy by the optimal forecast code based on a two-fluid model, there are some problems in the accuracy of forecast of low velocity two-phase flow, therefore, the subjects related to it were studied. The subjects are the forecast using the multi-dimensional optimal forecast code of the heat transfer acceleration phenomena in high power output fuel assemblies originating in the radial power distribution in a core in the reflooding period at the time of LOCA, the evaluation of the applicability of the hydrothermal model in a core in reflooding period which was developed for 15 x 15 type fuel assemblies to 17 x 17 type fuel assemblies, the grasping of the mechanism of opposite flow limiting phenomena in hot leg, the elucidation of the scale effect of channels and the development of a model which is applicable up to actual reactor scale. The studies carried out on these subjects and the conclusions of respective studies are reported. (K.I.) 79 refs.}
place = {Japan}
year = {1992}
month = {Oct}
}