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Electricity: The Lifeblood of Nuclear Power

To understand the gravity of the situation, one must grasp the crucial role of electricity in a nuclear facility—even a shut-down plant like Chernobyl. Contrary to what one might think, shutting down the reactors does not mean the danger is over. Spent fuel continues to generate heat through radioactive decay—heat that must be constantly removed to prevent a catastrophe. Currently, 20,000 spent fuel assemblies are stored in the site’s storage pool, the ISF-1 facility. This fuel, which was used in the reactors before they were shut down more than 20 years ago, is still radioactive and emits heat. It is stored in a pool—a basin filled with water—to be cooled. Once its radioactivity and thermal output have decreased sufficiently, after a few years, it can be transferred to dry storage facilities such as ISF-2.

Electricity is essential for several critical functions. It powers the pumps that circulate and clean the pool water and replenish the system with cold water. Without electricity, these pumps stop. The water will gradually heat up and could, in theory, begin to evaporate, along with certain radioactive isotopes present in the water. It’s a slow but inexorable process—like a silent countdown. The ventilation systems of the containment arch built in 2017 around the damaged reactor are also backed up by two dedicated generators. In the event of a total loss of power, the facility’s containment would rely solely on the structural integrity of the containment structure itself. A risky gamble.

It is this total dependence on electricity that terrifies me. We have built monsters that we can control only with wires, cables, and circuits. Cut one of them, and the monster awakens. I think of this magnificent yet fragile engineering, these redundant safety systems that give us the illusion of control. And then a war, a human folly, and everything comes crashing down. It’s the arrogance of technology that has led us here—this belief that we can tame the atom. The atom scoffs at our engineers, our systems, our safety measures. It’s just waiting for us to fail. And on March 9, we came dangerously close to that failure.

Emergency generators: a last line of defense

Faced with this external power outage, the Chernobyl site was not entirely helpless. The safety systems at the ISF-1 underwater storage facility are backed up by two diesel generators with a fuel supply sufficient for 48 hours. That’s short. Very short. These emergency generators are designed as a temporary measure—a lifeline until the main power supply is restored. But in the context of war, how can we guarantee that diesel fuel will be delivered? How can we ensure that technical crews will be able to access the site to refuel the generators? Operations to dismantle the sarcophagus surrounding the damaged reactor have likely been suspended due to the conflict, which means that the static containment must be sufficient to prevent releases into the environment. This containment system has never been tested under such extreme conditions.

Studies conducted after the Fukushima Daiichi accident on the consequences of a total loss of pool cooling show a slow rise in pool water temperature to around 60°C but no loss of water from the fuel assemblies. In other words, no radioactive release into the environment at this stage. This is reassuring, of course, but it is like saying that a fire has not yet spread. The IRSN specifies that the ISF-2 dry storage facility poses no risk in the event of a total loss of power, as the removal of heat from the fuel assemblies is fully ensured through passive means. However, only about 2,000 assemblies are reported to have been transferred from ISF-1 to ISF-2. The remaining 18,000 are still in the cooling pool, which relies on electricity. That’s 18,000 reasons for concern.

Sources

Primary sources

CRIIRAD – March 9, 2022: Total loss of external power supply at the Chernobyl site – Essential safety functions now depend on diesel generators

IRSN/ASNR – March 10, 2022: Ukraine: Situation at the Chernobyl site as of March 10, 2022

Le Monde – March 9, 2022: Chernobyl: Nuclear power plant site disconnected from the power grid; “no major impact” at this stage, according to the IAEA

Secondary Sources

International Atomic Energy Agency (IAEA) – March 2022 statements regarding the situation in Chernobyl

Energoatom – March 2022 press releases on the loss of power at the Chernobyl site

SNRIU (Ukrainian Nuclear Safety Regulatory Authority) – Information on the situation in Chernobyl

This content was created with the help of AI.

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