In-vessel Steam Explosion Simulation

 

Introduction:

 

This is a numerical simulation of the In-vessel steam explosion with the computer codes PM-ALPHA.L and ESPROSE.m

 

The premixing transient is the simulation of the mixing of molten fuel with water at the bottom of the reactor vessel

(generated by PM-ALPHA.L)

 

The explosion is the simulation of the pressure wave in the vessel when the premixture is triggered at a specific location as shown

(generated by ESPROSE.m)


 

1.    C2-case, d = 2cm, breakup parameter = 30, Saturated Pool

Premixing Transient

2.    C2-case, d = 2cm, breakup parameter = 30, 10 C subcooling

Premixing Transient

2a.    Explosion of case 2 premixture at 0.49 seconds

        Triggering location and initial premixture

              af = minimum void fraction required for fragmentation to occur
              Xc = Condensation factor (higher Xc, faster the condensation rate)

               Maximum pressure for different af with Xc = 0.25 (norminal value)
            Maximum pressure for different Xc with af = 0.05 (norminal value)
 

3.    C2-case, d = 2cm, breakup parameter = 30, 20 C subcooling

Premixing Transient
 
4a.    C2-case, d = 2cm, breakup parameter = 30, 30 C subcooling

Premixing Transient
 
4b.    C2-case, d = 2cm, breakup parameter = 30, 30 C subcooling (boiling/condensation turned off)

Premixing Transient