B2104 - Flow Instrumentation Flashcards
What flow is indicated with no recirc pumps running?
why?
30-32 mlbm/hr
approx 1.6 mlbm/hr is no flow.
1.6 * 24 jet pumps = 30-32 mlbm/hr
When should you manually add total flow indication?
indicated < 38 mlbm/hr
If one loop is tripped, what happens?
The logic subtracts the flow from the loop that is < 270 rpms
Total flow is where?
total of all jet pumps
Drive flow is where?
flow through the elbows
What’s the purpose of RPV flow instrumentation?
monitor core flow and DP during normal ops, start up, shutdown, and post accident conditions
How many jet pumps are there?
24
How many calibrated jet pumps
4
How many un-calibrated jet pumps?
20
What jet pumps are calibrated and what loops do they come off of?
6 and 12 are the “A” loop
18 and 24 are the “B” loop
Where is core plate DP taken from?
below plate and above the plate
where is core DP taken from?
below plate and narrow range level tap
Where is DP sensed from a non-calibrated jet pump?
between the jet pump throat (low pressure) and core plate (inlet plenum)(high pressure)
Where is DP sensed on a calibrated jet pump?
between the throat (low pressure) and diffuser (high pressure)
