control rod drive mechanism मीनिंग इन हिंदी

In PWRs they are inserted from above, with the control rod drive mechanisms mounted on the reactor pressure vessel head.
The flaw was near the nozzle for a control rod drive mechanism and attributed to primary water stress corrosion cracking, though no actual leakage was detected.
Many of the failure modes that caused a stuck rod during tests ( like bearing and clutch wear ) would only apply to a movement performed by the control rod drive mechanism.
IRIS is a smaller-scale design for a Pressurized water reactor ( PWR ) with an integral reactor coolant system layout, meaning the steam generators, pressurizer, control rod drive mechanisms, and reactor coolant pumps are all located within the reactor pressure vessel.