International Standard Problems and Small Break Loss-of-Coolant Accident (SBLOCA)

Table 4

Main characteristics of the considered transient.

ISP	Facility/plant	Test	Type	Secondary side	Emergency systems	Recovery	End of test
ident.				significant conditions	in primary side^(*)	procedure	(s)
ISP 18	LOBI	A2-81	SBLOCA Ab = 1%Amax in cold leg	Imposed 100K/hr	HPIS in cold leg	Secondary system feed and bleed	4500
ISP 20	DOEL	SGTR 1979	SGTR Ab = 0.5^(+)% of Amax	EFW and steam Relief valves active	HPIS in cold leg: pressurizer sprays and heaters	—	3000
ISP 22	SPES	SP-FW-02	LOFW-loss of feed water	Boildown of secondary side and EFW active in one loop	Pressurizer PORV and heaters	EFW in one loop	8000
ISP 26	LSTF	SB-CL-18	SBLOCA Ab = 5% of Amax	Steam relief valves active	Accumulators and LPIS in cold leg	RHR actuation	1000
ISP 27	BETHSY	9.1.b	SBLOCA Ab = 0.4% of Amax	EFW and pressure control active	Accumulators and LPIS in cold leg	Depressurizarion of secondary side	8000

^(*)scram is assumed in all cases following a low pressure signal.
⁽⁺⁾rough evaluation