Reactor Coolant System Flashcards
Describe the purpose/function of the RCP’s?
The RCPs circulate water through the reactor core in a closed piping system at a sufficient rate to insure proper heat transfer and prevent excessive fuel temperatures.
What is the design/function of the Reactor Coolant System?
The pressure and fission product boundary between the reactor coolant and the containment.
A heat transfer path to bring the reactor to a safe shutdown state and maintain it there.
Transfers heat to the feedwater which is transformed to steam to drive the turbine generator for electrical power production.
What is the purpose/function of the RCP’s?
The RCPs circulate water through the reactor core in a closed piping system at a sufficient rate to insure proper heat transfer and prevent excessive fuel temperatures.
What is the purpose/function of the Pressurizer including heaters and spray?
Pressurizer heaters in the liquid space are used to form steam to raise and maintain pressure.
The pressurizer spray valves inject water into the pressurizer vapor space to condense steam in the vessel and to prevent the pressurizer pressure from reaching the setpoint of the PORV
What is the purpose/function of the Pressurizer PORV’s?
The power-operated relief valves are designed to limit the pressurizer pressure to a value below the high pressure reactor trip set point for all design transients. During normal operating conditions, these valves are set to open at 2335 psig
How does the Reactor Coolant System ensure decay heat removal is available following a loss of offsite power?
the RCS maintains cooling flow through the core by, first, the RCP coast-down and, afterwards, by natural circulation through the core.
If you lost CCW what how is the RCS affected?
Lose Cooling to RCP Seals,
Lose Cooling to Letdown Heat Exchanger,
Lose Cooling to Reactor vessel support coolers,
Lose Cooling to RCP Thermal barrier
If you lost NESW how is the RCS affected?
RCP Motors would over heat.
If you lost CVCS how is the RCS affected?
Lose cooling for Regen Heat Exchanger, Lose Seal Injection, Pressurizer level lowers
State the Modes of operation and their set points.
Mode. TITLE. Reactivity % TH PWR. TEMP.
- Power operation >.99 >5% >=350
- Startup. >.99 =350
- Hot shutdown 200 200
- Cold shutdown
- Refueling. 1st head bolt detentioned
What is required for natural circulation?
Heat Source - Core
Heat Sink – Steam Generator
Heat Sink above Heat Source
Flow path
List the consequences if Seal Injection is not restored in a timely manner after removing the RCPs from its backseat.
Dirty seals
List the inspections that should be made on the RCPs while on its backseat.
Less than 10gpm gross leakage from RCP’s when on backseat
