Steam-water critical flow from high pressure systems. Interim report

Abstract

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Pressure and coolant mass changes diagrams for vessel blowdown.

“…1 (c)) except for the early stage of the lower break blowdown for the saturated system and the discharge coolant enthalpy is assumed to be'•> ( 4) where complete mixing of vapor and liquid in the vessel is assumed. For the subcooled water system and for the early stage of saturated water blowdown through the lower break, the liquid phase coolant discharges and the enthalpy of the flowing-out fluid is given by ( 5) As reported in Ref. (3), the changes of pressure and specific volume during blowdown are given by the following from the conservation laws of energy and mass:…”

Pressure and Coolant Mass Changes Diagrams for Vessel Blowdown

“…where complete mixing of vapor and liquid in the vessel is assumed. For the subcooled water system and for the early stage of saturated water blowdown through the lower break, the liquid phase coolant discharges and the enthalpy of the flowing-out fluid is given by ( 5) As reported in Ref. 3, the changes of pressure and specific volume during blowdown are given by the following from the conservation laws of energy and mass:…”

“…The simulated decay heat curve is 20% higher than that of the ANS standard <•>, The phase of discharging coolant is assumed to be a two-phase mixture for the saturated and liquid phase for the subcooled water system as shown in Eqs. (3) and (5), respectively. tion rate is large and the pressure falls almost instantaneously to the saturated one corresponding to the initial temperature of the subcooled water.…”