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MMOSS-I: a CANDU multiple-channel thermosyphoning flow stability model

Abstract

This paper presents a multiple-channel flow stability model, dubbed MMOSS, developed to predict the conditions for the onset of flow oscillations in a CANDU-type multiple-channel heat transport system under thermosyphoning conditions. The model generalizes that developed previously to account for the effects of any channel flow reversal. Two-phase thermosyphoning conditions are predicted by thermalhydraulic codes for some postulated accident scenarios in CANDU. Two-phase thermosyphoning experiments in the multiple-channel RD-14M facility have indicated that pass-to-pass out-of-phase oscillations in the loop conditions caused the flow in some of the heated channels to undergo sustained reversal in direction. This channel flow reversal had significant effects on the channel and loop conditions. It is, therefore, important to understand the nature of the oscillations and be able to predict the conditions for the onset of the oscillations or for stable flow in RD-14M and the reactor. For stable flow conditions, oscillation-induced channel flow reversal is not expected. MMOSS was developed for a figure-of-eight system with any number of channels. The system characteristic equation was derived from a linearization of the conservation equations. In this paper, the MMOSS characteristic equation is solved for a system of N identical channel assemblies. The resulting model is called MMOSS-I.  More>>
Authors:
Gulshani, P; [1]  Huynh, H [2] 
  1. Atomic Energy of Canada Ltd., Mississauga, ON (Canada)
  2. Hydro-Quebec, Montreal, PQ (Canada)
Publication Date:
Dec 31, 1995
Product Type:
Conference
Report Number:
INIS-CA-0053; CONF-950623-
Reference Number:
SCA: 210400; PA: AIX-28:076146; EDB-97:143822; SN: 97001880552
Resource Relation:
Conference: 35. annual conference of the Canadian Nuclear Association and 16th annual conference of the Canadian Nuclear Society, Saskatoon (Canada), 4-7 Jun 1995; Other Information: PBD: 1995; Related Information: Is Part Of CNS proceedings of the 16. annual conference, volume I and II; Wight, A.L.; Loewer, R. [eds.]; PB: [2 v. ] p.
Subject:
21 NUCLEAR POWER REACTORS AND ASSOCIATED PLANTS; CANDU TYPE REACTORS; LOSS OF COOLANT; THERMOSYPHONS; COMPUTERIZED SIMULATION; AFTER-HEAT REMOVAL; FLOW MODELS; FLOW RATE; GENTILLY-2 REACTOR; M CODES; NATURAL CONVECTION; PRIMARY COOLANT CIRCUITS; REACTOR SAFETY EXPERIMENTS; STABILITY; TEST FACILITIES; TWO-PHASE FLOW
OSTI ID:
545973
Research Organizations:
Canadian Nuclear Society, Toronto, ON (Canada)
Country of Origin:
Canada
Language:
English
Other Identifying Numbers:
Other: ON: DE98603788; TRN: CA9700748076146
Availability:
INIS; OSTI as DE98603788
Submitting Site:
INIS
Size:
pp. [23]
Announcement Date:

Citation Formats

Gulshani, P, and Huynh, H. MMOSS-I: a CANDU multiple-channel thermosyphoning flow stability model. Canada: N. p., 1995. Web.
Gulshani, P, & Huynh, H. MMOSS-I: a CANDU multiple-channel thermosyphoning flow stability model. Canada.
Gulshani, P, and Huynh, H. 1995. "MMOSS-I: a CANDU multiple-channel thermosyphoning flow stability model." Canada.
@misc{etde_545973,
title = {MMOSS-I: a CANDU multiple-channel thermosyphoning flow stability model}
author = {Gulshani, P, and Huynh, H}
abstractNote = {This paper presents a multiple-channel flow stability model, dubbed MMOSS, developed to predict the conditions for the onset of flow oscillations in a CANDU-type multiple-channel heat transport system under thermosyphoning conditions. The model generalizes that developed previously to account for the effects of any channel flow reversal. Two-phase thermosyphoning conditions are predicted by thermalhydraulic codes for some postulated accident scenarios in CANDU. Two-phase thermosyphoning experiments in the multiple-channel RD-14M facility have indicated that pass-to-pass out-of-phase oscillations in the loop conditions caused the flow in some of the heated channels to undergo sustained reversal in direction. This channel flow reversal had significant effects on the channel and loop conditions. It is, therefore, important to understand the nature of the oscillations and be able to predict the conditions for the onset of the oscillations or for stable flow in RD-14M and the reactor. For stable flow conditions, oscillation-induced channel flow reversal is not expected. MMOSS was developed for a figure-of-eight system with any number of channels. The system characteristic equation was derived from a linearization of the conservation equations. In this paper, the MMOSS characteristic equation is solved for a system of N identical channel assemblies. The resulting model is called MMOSS-I. This simplification provides valuable physical insight and reasonably accurate results. MMOSS-I and a previously-developed steady-state model THERMOSYPHON are used to predict thermosyphoning flow stability maps for RD-14M and the Gentilly 2 reactor. (author). 11 refs., 7 figs.}
place = {Canada}
year = {1995}
month = {Dec}
}