Item

Condition

SB-SG-16

SB-SG-17

SB-SG-18

Break valve open

Time zero

Generation of scram signal

PZR pressure = 12.97 MPa

Generation of SI signal

PZR pressure = 12.27 MPa

Start of HPI system

None

Soon after SI signal generation

None

Start of intact SG depressurization

12 minutes after scram signal generation

Auxiliary feedwater system

Actuation

Total-failure

Start of primary depressurization

Primary pressure = broken SG secondary-side pressure

Hot leg fluid temperature in intact loop = 547 K

Primary pressure = broken SG secondary-side pressure

End of HPI system

None

PZR liquid level = 1 m

None

End of primary depressurization

End of test

Confirmation of effect of primary depressurization

End of test

End of intact SG depressurization

End of test

Primary pressure = broken SG secondary-side pressure

End of test

Start of ACC system

Primary pressure = 4.51 MPa

Total-failure

Start of manual coolant injection from HPI system into cold legs

None

Maximum core exit temperature = 623 K

End of manual coolant injection from HPI system into cold legs

None

End of test