An Incredible Thorium Repository
- Nilormi Das
Do you have a wanderlust for exploring incredible India!? Traversing a land as vast and diverse as India can be both exhilarating and overwhelming. It is a land of striking geographic and cultural contrasts, stretching from the mighty Himalayas in the north to the Indian Ocean in the south, where Sri Lanka lies across the Palk Strait. Its eastern and western coastlines are fringed with spectacular beaches. This article explores the tropical beaches of India’s west coast and their remarkable contribution to the Indian Nuclear Power Programme.
The beach sands of Kerala harbor rich reserves of Monazite, a mineral ore containing 9–10% ThO2 (thorium oxide). The large abundance of thorium forms the long-term basis of India’s nuclear power programme Being fertile but non-fissile, Th-232 cannot undergo fission directly and, hence, cannot be utilized to produce energy without prior conversion. It must be transmuted to fissile U-233 upon absorbing a neutron within a reactor, through the following decay chain:
Th-232 + n → Th-233 → Pa-233 → U-233 (via successive beta decay steps)
Thorium is chemically extracted from monazite, typically in the form of thorium oxide (ThO₂), also known as Thoria. Additionally, monazite typically contains a high proportion of rare earth oxides, along with small amounts of uranium and other minerals. Monazite forms the primary source of the world’s thorium production. It is also an important ore for lanthanum, and cerium.
The three-stage Nuclear Power Programme was conceived by the father of the Indian Nuclear Programme, Dr. Homi Jehangir Bhabha. In the first stage, Pressurized Heavy Water Reactors (PHWRs) operate on natural uranium (UO₂), where the small fraction of fissile U-235 sustains fission, and a portion of the abundant U-238 is transmuted into Pu-239. The second stage employs Fast Breeder Reactors (FBRs), which utilize Pu-239 recovered from reprocessed spent fuel, blended with depleted uranium as mixed oxide (MOX) fuel; these reactors not only generate power but also breed additional fissile material by converting U-238 into more Pu-239. As plutonium inventories grow, thorium will be introduced into the reactor blanket, where it would absorb neutrons to form U-233. The third stage envisions advanced reactors fueled primarily by U-233, aiming to establish a long-term, self-sustaining nuclear energy cycle anchored in India’s abundant thorium resources.
The west coast beaches of India are among the most notable destinations for mineral wealth and tourism alike. Their characteristic jet-black sands owe their color to heavy mineral assemblages that include ilmenite, magnetite, rutile, zircon, sillimanite, and monazite; the last of which carries the thorium deposits described above. The black sands of Kerala, thus, represent both a scenic treasure and a strategic national resource. In addition to Kerala, thorium deposits are found in the Indian states of Odisha, Andhra Pradesh, Tamil Nadu.
So, what’s stopping you?!! Make your summer more happening and plan a sea-weekend to spend quality time on the black and beautiful beaches of Kerala enjoying the region’s famed backwaters and coastal scenery.
References:
https://en.wikipedia.org/wiki/India%27s_three-stage_nuclear_power_programme
https://medium.com/@nivedha./black-sand-beaches-of-india-an-inside-story-1b2a319c1970
https://www.pmfias.com/indias-three-stage-nuclear-power-programme/
https://images.app.goo.gl/gYcGrfXU2xxG64as9
https://www.pib.gov.in/newsite/PrintRelease.aspx?relid=112034®=3&lang=2