About contol rods used in boiling water reactor

[kumar1405]

why Cross shaped contol rods used in boiling water reactor?
thanks in adavance for answer .

 

[drvrm]

why Cross shaped contol rods used in boiling water reactor?
thanks in adavance for answer .

The control rods are composed of blades in a shape of cruciform in order to move through the gaps formed between channels of fuel assemblies.
A velocity damper is also provided at the lower portion
of the control rod
to slow down the dropping velocity in case of a accident.
for details one can visit: http://atominfo.ru/files/fukus/npp2.pdf

 

[kumar1405]

thank you for your valuable answer .