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 2

Major test conditions in each LSTF test.

Item	Condition
Initial core power	10 MW
Initial pressurizer pressure	15.7 MPa
Initial hot leg fluid temperature	600 K
Initial cold leg fluid temperature	563 K
Initial SG secondary-side pressure	7.3 MPa
Initial SG secondary-side collapsed liquid level	About 10 m
Generation of scram signal	Pressurizer pressure = 12.8 MPa
Generation of safety injection signal	Pressurizer pressure = 12.1 MPa
Start of SG secondary-side depressurization	10 s after safety injection signal
Start of auxiliary feedwater injection	About 2 min after safety injection signal
Actuation of ACC system	Primary pressure = about 4 MPa
Actuation of LPI system	Primary pressure = 1.0 MPa