Traditional serial approach: neither right boundary conditions are available to study PS nor correct source terms are obtained for containment pressurisation & long term cooling

	Informatic coupling of assessed PS codes & proven containment ones
	First approach: PS codes adopted for advanced reactors adapted to represent the containment in a simplified way
	Right approach: development & assessment of tools using the same basic equations & closure laws for both the systems, assuring that all terms that are responsible of coupling are directly considered

A further integration step must be added for ST analysis:
Coupled Evaluation of TH, chemical equilibria & FPs transport

DCMN of Pisa University started the TH integrated approach by upgrading the FUMO code, developed to analyse containment transients, with the introduction of a simplified PS module