SPES3 Facility RELAP5 Sensitivity Analyses on the Containment System for Design Review

Table 2

Characteristics of the IRIS cases.

IRIS cases	Characteristics	Results
IRIS-HT1	Containment heat structures simulated only for the DW.	Starting point for comparison with SPES3.
IRIS-HT5g	Heat structures added to all containment compartments and secondary sidepiping.; PSS main vent pipe connection to DW rise of 4 m.; PSS sparger set at 0.75 m from PSS bottom.; RWST remodelled with parallel slice approach.	Similar containment pressure response with SPES3.
IRIS-HT6_rwstc	SG tubes inner layer removed which simulated the Fouling.; ADS stage II actuation signal corrected to intervene on low LGMS mass.; RWST remodelling according to PERSEO area ratio and HTC calibration on experimental data. EHRS heat transfer parameters set as in SPES3 (by multiplier fouling factors) [12, 13].; RWST top pipe introduction for connection to atmosphere.; Correction of energy transfer parameters at the GOTHIC and RELAP5 code couplings.	Better matching of EHRS long-term energy transfer to RWST.
IRIS-HT6_rwstc1a	Corrected elevation difference between the RELAP5 and GOTHIC parts of the model: the ADS stage I vent pipe end should be 0.5 m from QT bottom (it was connected to QT top); LGMS tanks rise of 0.75 m.	Results very similar to IRIS-HT6_rwstc; BASE CASE for FSA final application.