ROSA/LSTF Tests and RELAP5 Posttest Analyses for PWR Safety System Using Steam Generator Secondary-Side Depressurization against Effects of Release of Nitrogen Gas Dissolved in Accumulator Water

Table 3

Chronology of major events in LSTF tests with or without release of dissolved nitrogen gas.

Event	Time (s)
	Release of dissolved nitrogen gas	No release of dissolved nitrogen gas
Break valve open	0	0
Generation of scram signal	120	118
Generation of safety injection signal	148	149
Start of primary coolant pumps coastdown	158	155
Start of SG secondary-side depressurization	159	160
Start of auxiliary feedwater injection	285	287
Liquid level formation at cold leg	365	365
Stop of primary coolant pumps	409	407
Actuation of ACC system	768	761
Isolation of ACC system	3162	2749
Actuation of LPI system	3651	2632
Core power off	4237	3225
Break valve closure	4250	3234