CONCLUSIONS

Advanced reactors create new challenges in TH codes development & validation

Strong coupling between PS & containment due to passive ESFs operation
makes unsuitable usual sequential calculations

 

Neither right boundary conditions are available to study PS behaviour nor correct energy sources to the containment are obtained

Integrated FUMO is the result of efforts aimed at investigating advanced reactor TH
basing on a realistic "plant approach"

Mainly intended for prediction of containment phenomena but results show
that indications on overall plant behaviour can be obtained

 

Integrated code assessment on experimental data is presently not feasible ò Separate validation appears the only possible choice at the moment

Some aspects involving an effect of AP600 & SBWR containment phenomena on the PS accident evolution highlighted:

	Gravity & Containment pressure driven coolant injection
	passive residual heat removal systems
	long term cooling features

 

Intrinsic limit in pressure reduction linked to the absence of active systems

High temperature, and in consequence high pressure, is the only driving forces
for carrying the decay heat outside the plant