Maarg Manthan · Topic 13.10

Radioactive Waste and Nuclear Waste Management

Science & Technology › Nuclear Technology and Energy · Topic 13.10

Radioactive waste is waste that contains radioactive material, produced by nuclear power plants, fuel reprocessing, research reactors, hospitals, industry and the mining of uranium. It is classed by activity and half-life as exempt, very low, low, intermediate and high level waste. High level waste, mainly the fission products left after reprocessing spent fuel, is very hot and radioactive for a long time and is the main concern. The usual management steps are to reduce the volume, to concentrate and immobilise the waste by turning it into a solid such as glass in a process called vitrification, to store it in shielded containers, and finally to dispose of it deep underground in a geological repository. India follows a closed fuel cycle that reprocesses spent fuel to recover plutonium and reduce waste, and the Department of Atomic Energy runs waste immobilisation plants at Tarapur, Trombay and Kalpakkam.

5 min read · UPSC Prelims · Science & Technology · Nuclear Technology and Energy

At a Glance

Waste classes Exempt to high level
Main treatment Vitrification
Final disposal Geological repository
India’s approach Closed fuel cycle, reprocessing
Regulator AERB
Exam link UPSC Prelims, Science & Technology: Nuclear Technology and Energy

Where Does It Fit?

This topic follows the account of radiation technologies. It deals with the by-products of nuclear activities, which is one of the main objections to nuclear power and a key part of the fuel cycle. Previous topic: Radiation Technologies and Their Applications. Next topic: Nuclear and Radiological Disasters.

How Is Radioactive Waste Classified and Treated?

Class	Features and treatment
Exempt waste	So low in radioactivity that it needs no control and may be released
Very low level waste	Soil and building rubble with slight contamination, disposed in near-surface landfills
Low level waste	Gloves, filters, tools and resins. Compacted or burned and placed in near-surface engineered trenches
Intermediate level waste	Reactor components, sludges and resins that need shielding. Immobilised in cement or bitumen
High level waste	Liquid waste from reprocessing with fission products, and spent fuel if not reprocessed. Generates heat. Turned into borosilicate glass by vitrification and stored in steel canisters
Spent fuel	First cooled in water pools for years, then stored dry or reprocessed
Decommissioning waste	Material from dismantling old reactors

What Are the Indian Practices and Challenges?

Closed fuel cycle: reprocessing recovers plutonium and uranium and reduces the amount and lifetime of the waste
Waste Immobilisation Plants: at Tarapur, Trombay and Kalpakkam vitrify high level liquid waste
Interim storage: solid storage surveillance facilities keep vitrified waste in air-cooled vaults for decades
Near-surface disposal: engineered facilities at nuclear sites for low and intermediate waste
Away from reactor storage: for spent fuel
Deep geological repository: India has research on a repository in stable rock for final disposal, still at a study stage
Radioactive Waste rules: the Atomic Energy (Safe Disposal of Radioactive Wastes) Rules, 1987 regulate disposal, with AERB oversight
Waste from hospitals: small amounts of short-lived isotopes decay in storage before release

What Else Should You Remember?

Half-life matters: short-lived waste decays in months or years, while some fission products and actinides stay radioactive for tens of thousands of years
Multi-barrier concept: a repository uses the waste form, the container, a buffer such as clay and the surrounding rock as barriers
Finland: built the first deep repository for spent fuel, Onkalo, which began trial operation around 2024 to 2025
United States: Yucca Mountain repository was stopped, and spent fuel remains at plant sites
France: reprocesses spent fuel and plans a deep repository named Cigeo
India’s challenge: finding a site and gaining public trust, along with ensuring long-term care
Fast reactors and burning waste: fast reactors and accelerator driven systems could consume long-lived actinides, as in India’s Three-Stage Civil Nuclear Programme
Uranium mill tailings: residue from uranium mining with low activity that needs stable ponds and covers
Transport: shipping casks are tested for fire, impact and immersion
Public information: open reports on waste inventory increase trust
Cost: waste management costs are included in nuclear power tariffs
Link: reprocessing is explained in Stages of India’s Nuclear Fuel Cycle
Decay heat: spent fuel keeps producing heat after the reactor stops, so it must be cooled in pools for years before moving
Dry cask storage: after cooling, spent fuel is placed in sealed steel and concrete casks that cool by air
Waste volumes: nuclear power produces a very small volume of waste compared with coal ash, though it is more hazardous per unit
Orphan sources: lost or abandoned radioactive sources from hospitals and industry need to be found and secured by regulators
Decommissioning: old reactors are shut and dismantled in stages, and their waste is sorted by activity, with funds set aside in advance
Public acceptance: people accept disposal sites more readily when they take part in decisions and see independent monitoring

Why Does It Matter for the Exam?

Classes: levels of waste
Treatment: vitrification and repository
India: closed cycle and immobilisation plants
Current affairs link: repository progress abroad
Common errors: saying that India directly buries spent fuel or that vitrification means burning waste

As an analytical point, waste is a solvable technical problem but a hard social one. Recycling through a closed fuel cycle, secure interim storage and a transparent plan for final disposal can build trust.

Why Is This Topic Important?

Classes Waste levels
Treatment Vitrification
India Reprocessing

What Came Next?

The last topic of the macro covers nuclear and radiological disasters. Next topic: Nuclear and Radiological Disasters.

Key People and Terms

Vitrification Turning waste into glass
Repository Deep disposal facility
Actinides Long-lived heavy elements
Decay storage Letting short-lived waste decay
Cladding Fuel tube
Borosilicate glass Glass used for waste

Exam Corner

Points to Remember

High level waste is vitrified in glass.
India follows a closed fuel cycle.
Disposal rules: 1987.
Immobilisation plants at Tarapur, Trombay, Kalpakkam.
Onkalo is in Finland.

Do Not Confuse With

Reprocessing and disposal Recovering material versus final storage
Interim storage and repository Temporary versus permanent
Low and high level waste Short-lived and weak versus hot and long-lived

Memory Hook

Classify, condense, vitrify, store; the glass goes in steel, and finally deep in the rock.

Mains Angle

Questions ask for classes, methods and the Indian approach. These points help.

Problem Long-lived waste
Methods Vitrify, store
India Closed cycle

A Question You May Face

An original practice question, not a past paper question.

“Discuss the methods of managing radioactive waste and the Indian approach to the back end of the nuclear fuel cycle.”

How to Answer

Classes Waste levels.
Methods Immobilise, store, dispose.
India Reprocessing, plants.
Way Repository, trust.

GS Relevance

Prelims: waste classes, vitrification, repository, Indian practice. GS Paper 3: science and technology, nuclear waste, environment.

Frequently Asked Questions

What is radioactive waste?

Radioactive waste is waste that contains radioactive material, produced by nuclear power plants, fuel reprocessing, research, hospitals, industry and uranium mining. It is classified as exempt, very low, low, intermediate or high level on the basis of how radioactive it is and how long it stays dangerous, and each class has its own method of handling.

What is vitrification?

Vitrification is the process of mixing high level liquid radioactive waste with glass-forming material, such as borosilicate, and melting it to form a solid glass block, which is poured into steel canisters. The glass locks the radioactive elements in a stable, durable form that resists leaching and is suitable for long term storage.

How does India manage high level waste?

India reprocesses spent fuel in a closed fuel cycle, then vitrifies the high level liquid waste in waste immobilisation plants at Tarapur, Trombay and Kalpakkam. The glass is stored in air cooled vaults under surveillance, and research is under way on a deep geological repository for final disposal.

What is a deep geological repository?

A deep geological repository is an underground facility built hundreds of metres deep in stable rock for the final disposal of high level waste and spent fuel. It uses several barriers, including the waste form, a metal canister, a clay buffer and the rock itself, to keep radioactivity away from people and the environment for thousands of years.

Which country has built the first deep repository for spent fuel?

Finland has built the first deep geological repository for spent nuclear fuel, called Onkalo, at Olkiluoto, and it began trial operations in the mid 2020s. Sweden and France are preparing their own repositories, while the United States has not completed one after the Yucca Mountain project was halted.

PYQ Practice — Statement Analysis

1 Vitrification converts high level waste into a glass form.

True

Borosilicate glass in steel canisters.

2 India follows an open fuel cycle in which spent fuel is not reprocessed.

False

It follows a closed cycle.

3 Waste immobilisation plants exist at Tarapur and Kalpakkam.