gt – mhr reactor cavity cooling system
DESCRIPTION
GT – MHR Reactor Cavity Cooling System. RCCS. RCCS-SNU: water-pool type RCCS -- water natural convection -- air force convection. Seoul National University. Conduction – radiation – convection . - PowerPoint PPT PresentationTRANSCRIPT
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GT – MHRReactor Cavity Cooling System
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RCCS
Conduction – radiation – convection
RCCS-SNU: water-pool type RCCS-- water natural convection-- air force convection
“Heat Transport and Afterheat Removal for Gas Cooled Reactors Under Accident Conditions”, IAEA-TECDOC-1163, 2000.
Seoul National University
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Y.J. Cho, M. O. Kim, G. C. Park, "Measuring Characteristics on Emissivity Using Infrared Thermometer for RCCS," NTHAS4: Fourth Japan-Korea Symposium on Nuclear Thermal Hydraulics and Safety, Sapporo, Japan, November 28-December 1, 2004
Heat removal mechanisms from RPV to cavity: – Thermal radiation (~80%)– Convection (~20%)
RCCS heat removal mechanisms:Active cooling: air forced-convectionPassive cooling: water boiling heat transfer &
air natural convection
1. Accident fuel temperatures are insensitive to RCCS performance2. Vessel temperatures are more sensitive to RCCS performance but still not a strong function3. Reactor cavity concrete temperatures are a strong function of RCCS performance
Conclusion from Idaho Nation Laboratory May 24 – 27, 2010
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Pool type RCCS Example
Side tank & 12 pipes with one loop meshed
12 Bended pipe vs. straight pipes ?
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Experiment
(a) Upper tank of the test facility (b) Side water tank
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Schematic diagram of the test facility
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Detail dimensions
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(80% radiation 20% conduction)
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• 1/10 linear scaled 1/1000 volume.• 1/100 power scale.• Heat flux is preserved in the proto and model • Time scale is reduced to 1/10.• Axial distribution of temperature in water pool
is not considered.• Scaling analysis is carried out to derive the
similarity criteria of RPV temperature.
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1. Constant heat flux2. Heat flux distribution3. Cavity natural circulation(20%, 50%, 80%
Helium)4. Boiling heat transfer of water pool5. Air natural convection (chimney height)