FAQ Archive - Energia nucleare

Is it true that a nuclear power plant can explode like an atomic bomb?

Scarniglia Francesco — Thu, 16 Jul 2026 13:43:17 +0000

A civilian reactor does not have the geometry, enrichment level, or assembly speed required for a nuclear detonation. In an accident, steam or hydrogen explosions can occur, as at Fukushima, or chemical/thermal explosions, but not an atomic detonation. This distinction is made explicit by the NRC and MIT: the fuel in a reactor is not […]

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If the power goes out, does a nuclear power plant automatically go out of control?

Scarniglia Francesco — Thu, 16 Jul 2026 13:43:17 +0000

Loss of external power supply is accounted for in safety analyses: plants have emergency systems, batteries, generators, and procedures to maintain cooling. Fukushima showed that a prolonged loss of power and cooling can become serious; this is precisely why post-Fukushima requirements and countermeasures were strengthened. So it is not ‘automatic’, but it is not a […]

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Are modern nuclear power plants really safe?

Scarniglia Francesco — Thu, 16 Jul 2026 13:43:18 +0000

Modern standards apply the principle of defence in depth: accident prevention, control of abnormal events, redundant and independent systems, containment, and emergency management. The IAEA requires that events with large early releases be prevented or practically eliminated at the design stage. A residual risk remains, as with any large industrial infrastructure, but it is not […]

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Can a single human error trigger a new Chernobyl?

Scarniglia Francesco — Thu, 16 Jul 2026 13:43:18 +0000

Chernobyl was not the simple result of a single human error: it involved a test conducted unsafely, serious shortcomings in safety culture, and characteristics of the RBMK reactor, including instability under certain operating conditions and the absence of a Western-style containment structure. Modern plants have different physical characteristics, automated systems, procedures, and containment structures. Human […]

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What happens if a plane crashes into a nuclear power plant?

Scarniglia Francesco — Thu, 16 Jul 2026 13:43:18 +0000

For new reactors in the United States, the NRC requires an explicit assessment of the impact of a large commercial aircraft, with the goal of maintaining essential functions such as core cooling, containment, and spent fuel cooling. IAEA standards also address extreme external events. No structure is absolutely invulnerable, but the idea that a plane […]

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Could a terrorist attack cause a nuclear catastrophe?

Scarniglia Francesco — Thu, 16 Jul 2026 13:43:19 +0000

Nuclear plants are sensitive infrastructures and are therefore subject to physical security requirements, cybersecurity, access control, response plans, and analysis of external events. An attack can increase risk, especially if it compromises power, cooling, or personnel. However, not every act of sabotage implies core meltdown or radiological release. The Ukrainian case shows that armed conflict […]

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Are nuclear power plants the most dangerous industrial facilities?

Scarniglia Francesco — Thu, 16 Jul 2026 13:43:19 +0000

When comparing deaths per unit of electricity produced, including accidents and air pollution, coal and oil are far more harmful than nuclear. Nuclear has rare but highly perceived risks, because accidents are memorable and linked to radiation. Quantitative comparisons from Our World in Data place nuclear among the sources with the lowest deaths per TWh.

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In the event of an accident, should an entire city be evacuated?

Scarniglia Francesco — Thu, 16 Jul 2026 13:43:19 +0000

Evacuation decisions are based on predicted dose, release direction, distance, weather, and the possibility of indoor shelter. Modern standards aim to prevent large early releases and to limit off-site consequences. Fukushima involved extensive evacuations, but UNSCEAR has not attributed observable health effects to the doses received by the resident population. Not every accident can be […]

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Are nuclear power plants more dangerous than dams?

Scarniglia Francesco — Thu, 16 Jul 2026 09:37:47 +0000

Dams can cause rare but very severe disasters, while nuclear concentrates risk in the management of radioactivity and severe accidents. In terms of deaths per TWh, available comparative estimates place both hydroelectric and nuclear among the low-mortality sources, with nuclear generally very low. Saying that one technology is always ‘more dangerous’ than the other without […]

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Does a major earthquake cause a nuclear power plant to explode?

Scarniglia Francesco — Thu, 16 Jul 2026 14:07:00 +0000

An earthquake can pose a serious stress on a plant and may trigger automatic shutdown, but it does not produce a ‘nuclear explosion’. Nuclear plants are designed based on seismic assessments of the site and criteria for external events. After Fukushima, attention to combined events such as earthquake, tsunami, and loss of power has increased. […]

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