Verification of the Efficacy of Passive Autocatalytic Recombiners in a Typical Pressurized Water Reactor under a Station Blackout Condition

Table 5

List of MAAP parameters reviewed in the sensitivity study.

Parameter	Range	Default	Description
LMCOL0; LMCOL1; LMCOL2; LMCOL3	48.0∼54.0	53	(i) Collapse criterion parameters for a Larson–Miller-like functional dependence
EPSCUT	0.0∼0.25	0.1	(ii) Cutoff porosity below which the flow area and the hydraulic diameter of a core node are zero
TCLMAX	100∼3000 K	2500 K	(iii) Temperature that will lead to cladding rupture
FAOX	1.0∼2.0	1.0	(iv) Multiplier for the cladding outside surface area
FGBYPA	0∼1	1	(v) Flag to divert gas flows in the core to the bypass channel
TAUTO	750∼1200 K	983 K	(vi)Autoignition temperature for hydrogen and carbon monoxide burns
TJBRN	900∼1900 K	1060 K	(vii) Temperature of a H2 jet entering a noninserted compartment which is sufficient to cause a local burn
DXHIG	−0.04∼1	0.0	(viii) Offset H2 and CO mole fraction for ignition of a flammable mixture
ENT0	0.025∼0.060	0.045	(ix) Jet entrainment coefficient for the Ricou–Spalding correlation
EPSCU2	0.001∼0.35	0.2	(x) Cutoff porosity below which the flow area and the hydraulic diameter of a collapsed core node
FZORUP	0.0∼1.0	0.7	(xi) Minimum fraction of Zr that must be oxidized to keep the cladding intact if the cladding is at TCLMAX