| Reactivity
control system: |
| |
| - one
hight speed emergency Shutdown system |
| (one
neutron absorber tank on each two assemblies). |
| - one
burn up variation system |
| (one
neutron absorber tank on each two assemblies). |
| - one
power variation system |
| (40
tanks needed). |
| - one
axial offset and temperature compensation system |
| (16
tanks needed). |
| |
| Measurement
system: |
| |
| - one
flux measurement device each four assemblies. |
| - one
temperature measurement each assembly. |
| - one
injection control in each tank. |
| - one
operability channel rods control system. |
| |
| Upper
internals built in two parts. |
| The
upper internal (N°1) has conduits inside. |
| The
other one is to maintain the fuel assemblies. |
| |
| |
| Water
comes from fuel rods, through distribution plates, along neutron
absorber tanks, and through the cap. |
| |
| When
water goes out the cap, waterflow is rotated, temperature becomes
homogeneous. |
| |
| All
MP98'devices are upper the fuel. The neutron absorber tanks are under
and inside the Upper Internals. This neutron shield will protect all
the Upper elements from irradiation flux. That means people can work on
all these elements with low dosimetry. Maintenance and storage become
easier. It minimizes the wastes at power plant demolishing. |
| |
| Example
of a 900Mwe PWR reactor design: |
| Liquid
control rods: |
