Press Esc to close
Thursday 31 July 2014
News updated at 2:43 AM IST
Weather
Max: 28.4°C
Min : 20°C
In Bangalore
Generally cloudy

Scientists succeed in making N-waste less toxic

Kalyan Ray, Kolkata, Jan 6, 2013, DHNS:

Step includes reducing life of nuke waste from 20,000 to 300 years

In what may be a pathbreaking step in disposing of radioactive wastes generated by nuclear power plants, Indian scientists and engineers have successfully separated actinides—the most toxic component in nuclear waste—from the bulk waste material, reducing its life from close to 20,000 years to about 300 years.

“This means wastes will not be left for future generation for thousands of years to deal with,” Srikumar Banerjee, former chairman of Atomic Energy Commission, said on the sidelines of centenary session of the Indian Science Congress. “Tarapur Nuclear Power Plant has set up a large-scale unit to chemically filter out toxic minor actinides.”

The initial success, if replicated on a large scale in all the existing and upcoming nuclear power plants, would make handling of nuclear waste safer. A deep geological repository, however, will still be needed for safe keeping the nuclear waste inside vitrified glass matrix. But those wastes will be thousands of times less toxic.


Actinides are a bunch of 15 metallic chemical elements, which impart toxicity to radio-active wastes. They are some of the most dangerous radioactive poisons. If the minor actinides are “partitioned” or removed, the rest of the waste is dominated by materials having a half-life of about 30 years. So, in 10 half-lives, (300 years) they will have negligible activity. The partitioned minor actinides can then be “transmuted” or burned in Fast Breeder Reactors (FBR) or in Accelerator Driven Systems (ADS), the Department of Atomic Energy had stated in an affidavit in the Supreme Court.

“At some point of time, we will have to burn minor actinides in one of our fast reactors. The first FBR will be operational in an year or so. A number of such reactors are in the pipeline,” Banerjee said.

Disposing of radio-active waste has been a major issue raised by the anti-nuclear activists in India as the country has a different strategy in this regard compared with the US. Since all the spent fuel contain materials suitable for recycling, India reprocesses almost 97 per cent of spent fuel.

Each nuclear power plant has an underwater storage pool for storage of spent fuel named “spent fuel storage bay.” The 97 per cent is made re-usable through a chemical “reprocessing”. Since almost the entire spent fuel is recycled, Indian nuclear scientists—bereft of any large domestic uranium source—consider spent fuel as a resource rather than waste.

But the remaining 3 per cent spent fuel is not reusable and consists of various fission products and minor actinides, which have a long half-life of lakhs of years and make nuclear wastes poisonous.

The separation of actinides is a major problem even for the developed countries because of the  long-term hazard of many actinides, but is also due to the regulatory requirements associated with actinides waste disposal, which are different from those associated with other radioactive wastes.

Go to Top

Photo Gallery
Villagers console each other as they watch a rescue operation at the site of a landslide in Malin...

Villagers console each other as they watch a rescue operation at the site of a landslide in Malin...

Barack Obama smiles as he talks about the economy at the Uptown Theater in Kansas City...

Barack Obama smiles as he talks about the economy at the Uptown Theater in Kansas City...

Rescue workers clear the debris at the site of a landslide in Malin village...

Rescue workers clear the debris at the site of a landslide in Malin village...

Palestinian man reacts next to the body of his relative...

Palestinian man reacts next to the body of his relative...

Palestinian boy comforts his father, whom medics said was wounded by Israeli shelling in Shejaia...

Palestinian boy comforts his father, whom medics said was wounded by Israeli shelling in Shejaia...

England's Whitlock competes in men's All-Around Artistic Gymnastics at 2014 Commonwealth Games...

England's Whitlock competes in men's All-Around Artistic Gymnastics at 2014 Commonwealth Games...

England's Stuart Broad celebrates with his teammates after running out India's Murali Vijay...

England's Stuart Broad celebrates with his teammates after running out India's Murali Vijay...

The debris of a hillock after a landslide triggered by heavy rains at Malin village in Pune ...

The debris of a hillock after a landslide triggered by heavy rains at Malin village in Pune ...

Siddaramaiah at the launch of a drinking water unit in Vidhan Soudha premises in Bengaluru ...

Siddaramaiah at the launch of a drinking water unit in Vidhan Soudha premises in Bengaluru ...

Over forty houses were buried in a landslide triggered by heavy rains at Malin village in Pune ...

Over forty houses were buried in a landslide triggered by heavy rains at Malin village in Pune ...

Copyright 2014, The Printers (Mysore) Private Ltd., 75, M.G Road, Post Box 5331, Bangalore - 560001
Tel: +91 (80) 25880000 Fax No. +91 (80) 25880523