THE INTEGRATED APPROACH TO THE ACCIDENT EVALUATION
FOR ADVANCED LWRs

Foe further informationFrancesco Oriolo, Sandro Paci

Advanced Reactors have challenged code developers with the special characteristics of systems to be analysed, in particular concerning the thermal-hydraulic (TH) simulation

TH can also intrinsically affect fuel degradation as the FPs behaviour
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Integrated Approach (TH, AV & CH) to Source Term
As clear from working principles of passive ESFs, a stronger coupling between Primary System (PS) & containment phenomena respect to present NPPs exists

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An integrated simulation of both the systems is required in order to get a reliable information

 
Experimental evidence of the containment pressure influence on the activation of a PS gravity driven injection system

PIPER-ONE: 1/2200 scaled simulator of BWR-6,
twice modified to account for GDCS injection & IC operation (pool stratification effects) in SBWR

 

PIPER-ONE:  rod surface temperatures vs. GDCS pressure

Three tests differing for GDCS pressure

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delay on core rewetting time

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