Indian Nuclear Programme | General Awareness for SSC CGL PDF Download

Atomic Energy

Atomic energy, also known as nuclear energy, is derived from the reactions of atomic nuclei. It is produced during nuclear reactions, which can occur through either nuclear fission or fusion.

Nuclear Fission

Nuclear fission is a process where a heavy nucleus splits into two or more lighter nuclei, along with the release of energy. This process is utilized in nuclear reactors and atomic bombs.

Nuclear Fusion

Nuclear fusion involves the combining of two or more lighter nuclei to form a heavier nucleus. This reaction only occurs at extremely high temperatures (greater than 10⁶ K) and is thus referred to as thermonuclear. In hydrogen bombs, a mixture of Deuterium Oxide (DO) and Tritium Oxide (TO) surrounds an ordinary atom bomb.

Nuclear Reactor/Atomic Reactor

Nuclear reactors are devices designed to maintain a chain reaction that produces a steady flow of neutrons from the fission of heavy nuclei. They are categorized as either research reactors or power reactors.

• Research Reactors: These reactors, operated at universities and research centers, serve multiple purposes including producing radio pharmaceuticals for medical use, testing materials, and conducting research. Examples in India include Cirus, Dhruva, and Kamini.
• Nuclear Chain Reactions: In a chain reaction, neutrons released from fission trigger additional fissions in other nuclei, perpetuating the reaction. This can be controlled (as in nuclear power) or uncontrolled (as in nuclear weapons). For example, a Uranium-235 atom absorbs a neutron and splits into two new neutrons and significant energy. Some of these neutrons continue the reaction by fissioning more Uranium-235 atoms.

Mechanism of Nuclear Power Generation

In nuclear power plants, uranium fuel undergoes fission, generating immense heat. This heat produces high-pressure steam that drives turbines to generate electricity. Light Water Reactors (LWRs) use normal water as both a coolant and a moderator. The coolant removes the heat from the reactor core, while the moderator slows down the neutrons to sustain the chain reaction. Control rods manage the reactor's power by limiting excessive fission. The reactor containment vessel, made of steel, houses the reactor pressure vessel, and the primary water loop transfers heat to the secondary cooling system, which generates steam to drive turbines.

Parts of Nuclear Reactor

Development of Nuclear Energy in India

The Atomic Energy Bill of 1948 led to the establishment of the Atomic Energy Commission on August 10, 1948, with Dr. Homi J. Bhabha as its first Chairman. This commission was responsible for formulating and implementing atomic energy policies. The Department of Atomic Energy (DAE) was created on August 3, 1954, under the Prime Minister's direct oversight. On January 3, 1954, the Atomic Energy Establishment, Trombay (AEET), was founded and renamed Bhabha Atomic Research Centre (BARC) in 1967. BARC oversees nuclear reactor research and technology development in India.

India’s Three Stages Nuclear Power Programme

Dr. Homi J. Bhabha outlined a three-stage nuclear power program aimed at utilizing domestic resources:

• Stage I - Pressurised Heavy Water Reactor (PHWR): This stage uses natural uranium-fueled PHWRs to generate electricity and produce plutonium-239 as a by-product.
• Stage II - Fast Breeder Reactor (FBR): FBRs produce more fissile material than they consume. This stage uses a mixed oxide fuel made from plutonium-239 and natural uranium. Plutonium-239 undergoes fission to produce energy, while uranium-238 is converted into additional plutonium-239.
• Stage III - Thorium-based Reactor: This advanced reactor system uses thorium-232 and uranium-233 fuel to sustain a chain reaction.

Nuclear Research Reactors in India

• Apsara: India’s oldest reactor, designed by BARC with UK assistance, was shut down in 2010.
• Cirus: Located in Trombay and built with Canadian help, it was also shut down in 2010.
• Zerlina: An experimental zero-energy reactor built indigenously, decommissioned in 1983.
• Kamini: A research reactor at IGCAR in Kalpakkam, designed to use U-233 as fuel.
• Dhruva: India’s largest research reactor, a key source of weapons-grade plutonium.
• Fast Breeder Test Reactor (FBTR): A liquid metal fast breeder reactor designed jointly by BARC and IGCAR, based on the French Rapsodie design.

Advanced Heavy Water Reactor (AHWR)

This reactor will use thorium-based mixed oxide fuel with a small amount of plutonium. It involves developing indigenous equipment for producing thorium dioxide powder and conducting trials with uranium dioxide, relevant for future 500 MW PHWRs.

Development of Higher Technology Accelerator

Atomic accelerators increase the speed of atomic particles, enabling their use in radioisotopy and isotope formation.

• Pulse Electron Accelerator: Used for X-ray and high-frequency microwave applications, such as the KALI-500.
• Radio Telescopy: The National Centre for Radio Astrophysics in Pune, under Tata Institute of Fundamental Research (TIFR), focuses on this research.
• Agricultural Nuclear Technology: Nuclear isotopes are present in soil, plants, animals, and air, and are used in agriculture to improve crop varieties through radiation-induced genetic changes.

Radio Isotopes

In unstable atoms, the nucleus releases a neutron to regain stability, emitting radiation in the process. Such isotopes are known as radioisotopes. All elements with atomic numbers greater than 83 are inherently radioactive, possessing unstable nuclei. Elements with atomic numbers 83 and below have stable isotopes but may also have at least one radioactive isotope. As radioisotopes seek stability, they may undergo transmutation, transforming into new elements. Radioisotopes, by definition, are unstable and emit radiation, while not all isotopes are radioactive.

Applications of Radioisotopes

• Medicine: Used in diagnosing and treating diseases, sterilizing medical products, and other clinical applications.
• Industry and Technology: Applied in material inspection, welding processes, production control, and research.
• Agriculture: Utilized for pest control and food preservation.
• Art: Helps in art restoration and verifying the authenticity of historical or artistic objects.
• Archaeology: Assists in dating geological events and researching historical contexts.
• Pharmacology: Facilitates the study of drug metabolism prior to public release.

Radiocarbon Dating

Radiocarbon dating estimates the age of organic materials such as wood, charcoal, shells, bone, and sediments. Age determination is based on comparing the amount of carbon-14 to carbon-12 in a sample. Radiation counters detect the electrons emitted by decaying carbon-14, which helps in dating artifacts.

Tokamak

A tokamak is a device that uses a magnetic field to confine plasma in a torus shape. Achieving a stable plasma requires magnetic fields in a helical configuration, produced by combining toroidal and poloidal fields. Invented in the 1950s by Soviet physicists Igor Tamm and Andrei Sakharov, the term "tokamak" is short for "Toroidal Chamber Magnetic" in Russian.

ITER

ITER (International Thermonuclear Experimental Reactor) is an international project constructing the largest experimental tokamak nuclear fusion reactor in France. Its goal is to demonstrate the feasibility of nuclear fusion as a viable power source without adverse effects.

Nuclear Waste Management

Managing radioactive waste involves complex procedures due to its hazardous nature and strict regulatory requirements. India has developed self-reliant methods for managing radioactive waste. Following the Fukushima disaster in 2011, there has been local opposition to nuclear projects in India, such as the Jaitapur Nuclear Power Project and the Kudankulam Nuclear Power Plant.

Stages in Nuclear Waste Management

• Partitioning: Separates short-lived nuclides from long-lived ones using chemical or electrochemical methods.
• Transmutation: Converts long-lived nuclides into shorter-lived ones through radioactive bombardment.
• Conditioning: Prepares waste for handling, transport, storage, and disposal, often by converting it into a solid form and encasing it in containers.

Types of Radioactive Wastes

• Exempt and Very Low Level Waste (VLLW): Contains minimal radioactivity and is not considered harmful.
• Low-Level Waste (LLW): Includes items like paper, clothing, and filters from hospitals, industries, and the nuclear fuel cycle with low, mostly short-lived radioactivity.
• Intermediate-Level Waste (ILW): Has higher radioactivity and may require shielding.
• High-Level Waste (HLW): Results from the use of uranium fuel in reactors and has high radioactivity.

Nuclear Tests of India

India, as the sixth nuclear power, conducted its first test on May 18, 1974, in Pokhran, Rajasthan, named "Smiling Buddha." On May 11 and 13, 1998, India conducted five tests under Operation "Shakti," including fission, low-yield, and thermonuclear devices.

Regulation and Safety

• International Atomic Energy Agency (IAEA): Promotes peaceful nuclear energy use. India contributes to the IAEA’s Nuclear Security Fund. The current Director General is Yukiya Amano, and the IAEA has 162 member states.
• Atomic Energy Regulatory Board (AERB): Established in 1983 under the Atomic Energy Commission, it promotes safety research in nuclear facilities and has a dedicated institute at Kalapakkam.
• Nuclear Supplier Group (NSG): Formed in 1974, this group of 48 countries seeks to prevent nuclear weapon proliferation through export guidelines. India is exempt from the NSG’s restrictions without signing the Non-Proliferation Treaty.

Non-Proliferation Treaty (NPT)

The NPT aims to prevent the spread of nuclear weapons, encourage peaceful nuclear cooperation, and advance disarmament. Effective since 1970 and extended indefinitely in 1995, it includes the US, Russia, the UK, France, and China as nuclear weapon states. India, Pakistan, Israel, and South Sudan have not signed the treaty.

India’s Nuclear Doctrine

• No First Use: India commits to not using nuclear weapons first.
• Credible Minimum Deterrent: Ensures a sufficient, survivable, and operationally ready nuclear force with robust command, control, intelligence, and planning.

Nuclear Command Authority

India’s Nuclear Command Authority (NCA), established on January 4, 2003, consists of three tiers: the Political Council (headed by the Prime Minister, authorizing nuclear use), the Executive Council (headed by the National Security Advisor, providing inputs for decisions), and the Strategic Forces Command (responsible for nuclear force administration and operations).

CTBT and India

The Comprehensive Nuclear Test Ban Treaty (CTBT) bans all nuclear explosions and was adopted by the UN General Assembly on September 10, 1996. It has not yet entered into force due to the lack of ratification by eight specific states. India, Pakistan, and North Korea have not signed it, and six other states have signed but not ratified it.

India’s Points of Objections on CTBT

India argues that the CTBT should prevent both horizontal and vertical proliferation, avoid dividing nations into nuclear haves and have-nots, and address concerns about intrusive verification methods and the use of satellite technology.

Kudankulam Nuclear Power Plant Controversy

The Kudankulam Nuclear Power Plant, a joint Russia-India project in Tamil Nadu, faces local opposition due to concerns over the environmental impact of hot water discharge on marine life.

Treaty on the Prohibition of Nuclear Weapons (2017)

Known as the Nuclear Ban Treaty, it is the first legally binding agreement to comprehensively ban nuclear weapons. Adopted on July 7, 2017, it required ratification by at least 50 countries to take effect. As of June 2020, 38 states had ratified it. The treaty was established under the UN General Assembly on December 23, 2016.

India-Signed Action Plan with Russia

On October 5, 2018, during President Vladimir Putin’s visit, India and Russia signed an Action Plan for cooperation in the nuclear sector, planning the development of six nuclear plants in India.