Thermal-Hydraulic System Codes in Nulcear Reactor Safety and Qualification Procedures

Table 2

		UNIT	EXP	UNIPI 91BN1OLPSI	CEA c2m4_lcea	Judgment UNIPI/CEA
RTA: pressurizer emptying
TSE	Emptying time^*	s	131	46	—	R/-
	Scram time	s	41	38	41	R/E
RTA: steam generators secondary side behaviour
TSE	Main feed water off, turbine bypass	s	59	55	42	E/R
SVP	Difference between PS and SG 1 SS pressure at 100 s	MPa	0.42	0.33	0.37	R/R
SVP	SG 1 mass	Kg/(s)
	at the end of subcooled blowdown		774/(82)	781/(75)	761/(82)	E/E
	when PS pressure equals SG 1 SS pressure		869/(618)	938/(408)	847/(463)	R/R
	when ACC starts		804/(2955)	802/(3019)	788/(3075)	E/R
	when LPIS starts		938/(5176)	1126/(6529)	956/(5474)	R/R
SYP	SG 1 pressure	MPa
	at the end of subcooled blowdown		7.15	7.10	7.05	E/E
	when PS pressure equals SS pressure		6.95	7.04	7.03	R/R
	when ACC starts		4.11	3.95	4.00	R/E
	when LPIS starts		0.88	0.83	0.83	E/E
RTA: subcooled blowdown
TSE	Upper plenum in sat conditions	s	83	100	110	R/R
IPA	Break flow up to 100 s	kg	152	161	162	R/R
RTA: first dryout occurrence
TSE	Time of dryout	s	2237	2299	2444	E/R
	Range of dryout occurrence at various core levels	s	2237÷2471	2299÷2518	2444÷2625	R/R