352 7.7. Containment problem involving an LOCA (Section 7.2) Upon a loss of primary coolant accident (LOCA), the primary system flashes as it discharges into the containment. At the resulting final equi- librium condition, the containment and primary system are filled with a mixture of steam and liquid. A containment is being designed as shown in Figure 7.17 which directs the liquid portion of this mixture to flood into a reactor cavity in which primary system is located. The conden- sate which passes back into the core through the break can satisfacto- rily cool the core if it can submerge it, that is, if the condensate level is high enough. Find the containment volume which will yield a final equilibrium pressure following primary system rupture sufficient to create the 125 m of liquid required to fill the cavity and submerge the core. Core 125 m of liquid Nuclear Systems FIGURE 7.17 Containment with liquid fraction of discharge from LOCA directed to core cooling. The pressure and volume of the primary system are 15.5 MPa and 354 m, respectively. The containment initial conditions are 300 K and 0.101 MPa. Neglect the initial relative humidity. Neglect and Qc-am Answers: V-2.32 x 10 m V-2.27x10m PT = 0.97 MPa