Areva EPR
Areva EPR
Areva EPR
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■ <strong>EPR</strong> NUCLEAR ISLAND<br />
SYSTEMS<br />
CHEMICAL AND VOLUME CONTROL<br />
The Chemical and Volume Control System (CVCS) performs several<br />
operational functions.<br />
• Continuous controls the water inventory of the Reactor Coolant<br />
System (RCS) during all normal plant operating conditions, using<br />
the charging and letdown flow.<br />
• Adjusts the RCS Boron concentration as required for control of<br />
power variations and for plant start-up or shutdown, or to<br />
compensate for core burnup, using demineralized water and<br />
borated water.<br />
• Ensures permanent monitoring of the Boron concentration of all<br />
fluids injected into the RCS, control of the concentration and the<br />
nature of dissolved gases in the RCS by providing the means of<br />
injecting the required Hydrogen content into the charging flow and<br />
allowing degassing of the letdown flow.<br />
• Enables the adjustment of the RCS water chemical characteristics<br />
by allowing injection of chemical conditioning agents into the<br />
charging flow.<br />
•Ensures a high flow rate capability for primary coolant chemical<br />
control with coolant purification, treatment, degassing and storage.<br />
•Injects cooled, purified water into the Reactor Coolant Pump (RCP)<br />
seals system to ensure cooling and leaktightness and collection of<br />
the seal leakage flow.<br />
• Supplies borated water to the RCS up to the concentration<br />
required for a cold shutdown condition and for any initial condition.<br />
•Allows a reduction in pressure by condensing steam in the<br />
pressurizer by diverting the charging flow to the auxiliary pressurizer<br />
spray nozzle in order to reach Residual Heat Removal System<br />
(SIS/RHRS) operating conditions.<br />
• Allows filling and draining of the RCS during shutdown.<br />
• Provides a pressurizer auxiliary spray, if the normal system cannot<br />
perform its function, and make-up of the RCS in the event of loss<br />
of inventory due to a small leak.<br />
• Ensures the feed and bleed function.<br />
Chemical and Volume Control System<br />
Letdown<br />
Regenerative<br />
heat exchanger<br />
Auxiliary spray<br />
CCWS<br />
HP<br />
coolers<br />
CCWS<br />
Low pressure<br />
reducing<br />
LOOP 1<br />
PRT<br />
LOOP 2<br />
Reactor<br />
vessel<br />
Charging line<br />
M<br />
M<br />
Sampling<br />
system<br />
Coolant<br />
purification<br />
M<br />
LOOP 4<br />
LOOP 3<br />
Seal injection<br />
Coolant<br />
degasification<br />
IRWST<br />
IRWST<br />
Gas<br />
treatment<br />
Gas waste<br />
processing system<br />
Volume<br />
control<br />
tank<br />
Coolant<br />
storage<br />
Boric acid<br />
make-up<br />
Water<br />
make-up<br />
34 I<br />
N2<br />
H2