Validation of Advanced Computer Codes for VVER Technology: LB-LOCA Transient in PSB-VVER Facility

Table 2

Information on nodalizations and the code options.

Number	Quantity	Unit	EDO-GP pretest KORSAR	EDO-GP posttest KORSAR	EDO-GP pretest TECH-M	EDO-GP posttest TECH-M	NRI posttest ATHLET	UNIPI posttest R5-3D
1	Adopted code resources
1.1	Tot. no. of hydraulic components primary system	—	—	—	—	—	142	482
1.2	Tot. no. of hydraulic components	—	185	193	—	—	164	620
1.3	Tot. no. of hydraulic nodes (meshes) primary system	—	—	—	76+36	76+36	693	—
1.4	Tot. no. of hydraulic nodes (meshes)	—	858	825	81+36	81+36	820	2474
1.5	Tot. no. of heat structures	—	52	65	81+36	81+36	90	2171
1.6	Tot. no. of mesh points in the heat structures	—	509	629	4	4	2108	11263
1.7	Tot. no. of core active structures	—	10	10	30	30	20	20
1.8	Tot. no. of core radial meshes in the active structures	—	—	—	7	7	3	13
2	Nodalization features
2.1	No. of modeled loops	—	4	4	4	4	4	4
2.2	No. of horizontal tubes per SG	—	4	4	1	1	5	17
2.3	Core model (3D or 1D)	—	1D	1D	1D	1D	1D	1D
2.4	No. of hydraulic channels in core region	—	1	1	3	3	2	2
2.5	Cross-flow junctions between parallel channels in the core	—	Yes	Yes	No	No	No	Yes
3	Code options
3.1	Reflood model top-down	—	—	Yes	Yes	Yes	No	Yes
3.2	Reflood model bottom-up	—	—	Yes	Yes	Yes	No	Yes
3.3	CCFL model	—	—	No	Yes	Yes	Wallis	No