GT – MHR Reactor Cavity Cooling System

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Presentation transcript:

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 “Heat Transport and Afterheat Removal for Gas Cooled Reactors Under Accident Conditions”, IAEA-TECDOC-1163, 2000.

Conclusion from Idaho Nation Laboratory May 24 – 27, 2010 Heat removal mechanisms from RPV to cavity: – Thermal radiation (~80%) – Convection (~20%) RCCS heat removal mechanisms: Active cooling: air forced-convection Passive cooling: water boiling heat transfer & air natural convection 1. Accident fuel temperatures are insensitive to RCCS performance 2. Vessel temperatures are more sensitive to RCCS performance but still not a strong function 3. Reactor cavity concrete temperatures are a strong function of RCCS performance 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

Pool type RCCS Example Side tank & 12 pipes with one loop meshed 12 Bended pipe vs. straight pipes ?

Experiment (a) Upper tank of the test facility (b) Side water tank

Schematic diagram of the test facility

Detail dimensions

(80% radiation 20% conduction)

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.

Constant heat flux Heat flux distribution Cavity natural circulation(20%, 50%, 80% Helium) Boiling heat transfer of water pool 5. Air natural convection (chimney height)