We have launched our mobile app, get it now. Call : 9354229384, 9354252518, 9999830584.  

Current Affairs

‘Core catcher’ installed in Kudankulam nuclear power plant

Date: 25 December 2019 Tags: Energy


The Moscow-based Rosatom State Corporation Engineering Division has installed a core melt localisation device (CMLD) or “core catcher” at Unit 3 of Tamil Nadu’s Kudankulam Nuclear Power Plant (KKNPP).



Kudankulam Nuclear Power Plant is the largest nuclear power station in India, situated in Koodankulam in the Tirunelveli district of the southern Indian state of Tamil Nadu. Kudankulam, is India’s first nuclear plant to use imported PWR technology.



  • The device is designed to localise and cool the molten core material in case of a meltdown accident.

Core Catcher

  • The core catcher is a cone shaped metal structure that weighs about 800 tonnes. The structure is double walled, with the gap between the two walls filled with FAOG (ferric and aluminium oxide granules).

  • The core catcher is filled with a ceramic mixture also including ferric oxide and aluminium oxide, called ‘sacrificial material’.

  • The sacrificial material prevents the corium from trickling through and also acts as a cooling mechanism.

  • Molten core material, or corium, is lava-like material that gets formed in the core of a nuclear reactor in the event of a meltdown accident.

  • Such an accident occurs when the nuclear fission reaction taking place inside a reactor is not sufficiently cooled, and the buildup of heat causes fuel rods to melt down.

  • The corium so formed can remain radioactive for several decades, even centuries.

  • The core catcher device is installed at the bottom of the nuclear station’s protective shell, and is designed to save the latter as well as exude radioactive emission in the environment in case of a serious accident.

  • The device has improved seismic resistance, hydro-dynamic and shock strength as well as equipped with flood protection and simplified installation and assembly technology.

‘Core catcher’ installed in Kudankulam nuclear power plant 25 dec 19