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Title: Breakup of metal jets penetrating a volatile liquid. Final report, October 1, 1991--February 28, 1993

Abstract

In a loss of coolant accident, the core may become uncovered, causing the fuel pins to melt. The molten fuel would pour onto the plenum and collect on the reactor pressure vessel (RPV) lower head. The RPV internal structure includes one or more perforated plates in the lower plenum which would divide the molten fuel into small diameter streams or jets, which would break up as they penetrate the coolant in the lower plenum. The breakup of these jets would occur in two phases, each dominated by a distinct fragmentation mechanism. As a fuel jet first penetrates the coolant, a stagnation flow develops at its leading edge, causing the column to spread radially and eject molten fuel into the coolant. The jet fluid in the column is fragmented by pressure fluctuations due to the jet/ambient fluid relative motion, so that a steady jet is reduced to a field of falling drops below a critical depth called the breakup length. The present work includes analyses yielding simple correlations for jet breakup length and jet leading edge penetration.

Authors:
Publication Date:
Research Org.:
Illinois Univ., Urbana, IL (United States). Dept. of Nuclear Engineering
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
79023
Report Number(s):
DOE/ER/12900-T1
ON: DE95014740; TRN: 95:005090
DOE Contract Number:  
FG02-89ER12900
Resource Type:
Technical Report
Resource Relation:
Other Information: TH: Thesis (Ph.D.); PBD: [1995]
Country of Publication:
United States
Language:
English
Subject:
22 NUCLEAR REACTOR TECHNOLOGY; 99 MATHEMATICS, COMPUTERS, INFORMATION SCIENCE, MANAGEMENT, LAW, MISCELLANEOUS; MELTDOWN; MOLTEN METAL-WATER REACTIONS; PROGRESS REPORT; JETS; FUEL-COOLANT INTERACTIONS; CORIUM; VELOCITY; MATHEMATICAL MODELS; NOZZLES; REYNOLDS NUMBER

Citation Formats

Schneider, J P. Breakup of metal jets penetrating a volatile liquid. Final report, October 1, 1991--February 28, 1993. United States: N. p., 1995. Web. doi:10.2172/79023.
Schneider, J P. Breakup of metal jets penetrating a volatile liquid. Final report, October 1, 1991--February 28, 1993. United States. doi:10.2172/79023.
Schneider, J P. Sat . "Breakup of metal jets penetrating a volatile liquid. Final report, October 1, 1991--February 28, 1993". United States. doi:10.2172/79023. https://www.osti.gov/servlets/purl/79023.
@article{osti_79023,
title = {Breakup of metal jets penetrating a volatile liquid. Final report, October 1, 1991--February 28, 1993},
author = {Schneider, J P},
abstractNote = {In a loss of coolant accident, the core may become uncovered, causing the fuel pins to melt. The molten fuel would pour onto the plenum and collect on the reactor pressure vessel (RPV) lower head. The RPV internal structure includes one or more perforated plates in the lower plenum which would divide the molten fuel into small diameter streams or jets, which would break up as they penetrate the coolant in the lower plenum. The breakup of these jets would occur in two phases, each dominated by a distinct fragmentation mechanism. As a fuel jet first penetrates the coolant, a stagnation flow develops at its leading edge, causing the column to spread radially and eject molten fuel into the coolant. The jet fluid in the column is fragmented by pressure fluctuations due to the jet/ambient fluid relative motion, so that a steady jet is reduced to a field of falling drops below a critical depth called the breakup length. The present work includes analyses yielding simple correlations for jet breakup length and jet leading edge penetration.},
doi = {10.2172/79023},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1995},
month = {7}
}