Performance characterization of isolation condenser of SBWR Page: 2 of 28


The Isolation Condensers (IC) of a conceptual design of Simplified Boiling Water
Reactor (1,2) (SBWR) have been modeled to study the performance under various operating
conditions. There are two types of ICs ; the system ICs are designed to passively limit the
reactor pressure under accident conditions and the containment ICs are to remove the decay heat
after a LOCA.
A stand-alone computer code has been developed fo, simulating the system IC to be
utilized in the SBWR. This type of IC is used to control the reactor pressure by condensing
incoming steam to return the condensate directly into the reactor pressure vessel preserving the
total liquid inventory in the system. Since the amount of dissolved gases is limited by the
solubility of noncondensibles in the reactor coolant, this type of IC is being modeled without
considering the degradation due to the presence of noncondensibles. The alternate type receives
steam and gas mixture from the containment, which results in higher concentration of
noncondensibles inside the IC.
The variations of the boundary conditions considered here are (a) change in the initial
liquid level in the IC, (b) change in initial line pressure loss, (c) Change in the cooling capacity
of the IC pool , (d) variation of pressure in the steam line.
A consistent set of analyses has been performed utilizing the code for the above
mentioned variations. A set of differential equations arising from the mass and energy balance
of the Isolation Condenser has been solved numerically in order to obtain the transient pressure
and enthalpy variations following the initiation of the IC activation. The boundary conditions are
imposed by specifying the RPV steam line pressure and the condensate return pressure.
However, momentum equations applied to the steam inlet line and condensate return line
determine the rate of steam inflow and liquid outflow from the IC. Adequate control of pressure
has been observed for the different boundary conditions investigated. The passively controlled
flow behaviors are significantly influenced by the gravity induced flow of steam and condensate.


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Khan, H.J. & Rohatgi, U.S. Performance characterization of isolation condenser of SBWR, article, January 1, 1992; Upton, New York. ( accessed May 25, 2019), University of North Texas Libraries, Digital Library,; crediting UNT Libraries Government Documents Department.

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