The main steam safety valve setpoints are:
1185, 1195, 1205, 1215, 1225 psig
The combined capacity of all four atmospheric relief valves is _______ of rated main steam flow.
15%
What is the maximum differential pressure allowed for opening a MSIV?
25 psid
Describe the order in which mass enters and exits the secondary side of the steam generators.
3, 5, 1, 2, 6,4
Sub cooled feed water via feed ring
Mix with recirculating flow near saturation
Down inside the shell
Up tube bundle region
First stage separator
Second stage separator flow
Besides MSIVs, bypass valves, and atmospheric dump valves, which valves receive a CLOSE signal on a main steam isolation signal?
all MSS upstream drain automatic isolation valves
all TDAFW steam supply line upstream drain automatic isolation valves
What valves receive a CLOSE signal upon receipt of a MSI signal?
atmospheric relief valve
Rx trip due to loss of DC bus. MSIVs are open. Which DC was lost?
battery 6
Which of the following is a function of the steam generator steam outlet nozzle assembly?
chokes flow on a steam line break
Which of the following will cause a main steam isolation signal?
HI-2 containment pressure greater than 18 psia on 2 of 3 channels
During startup at least two MSIVs are opened simultaneously to minimize:
level swell
The ____ are designed to prevent overpressurization of the S/Gs.
main steam safety valves
Which of the following describes the operation of the main steam line isolation valves when the plant is operating?
MSIVs are held open by steam pressure. they automatically close by steam pressure when a MSI signal is generated
What is the function of the MSIV bypass valves?
preheating piping downstream of the MSIVs. sized to provide enough steam to the turbine gland sealing steam and condenser air ejectors
Which is a true statement about the steam generator j-tubes?
prevent water hammer during no/low feed water flow conditions
Which of the following will result in a MSI signal?
streamline pressure from one SG falls below 660 psig
