The most commonly cited problem associated with nuclear power facilities is radioactive waste, specifically the challenge of safely storing spent nuclear fuel that remains hazardous for thousands of years. But waste is far from the only concern. Nuclear power plants also raise issues around water consumption, environmental contamination from uranium mining, high decommissioning costs, and ongoing questions about cancer risk in nearby communities.
Radioactive Waste Has No Permanent Home
Every operating nuclear reactor produces spent fuel rods that are intensely radioactive. After removal from the reactor, these rods must cool in water pools for one to two years before they can be transferred to dry storage casks made of steel and concrete. The problem is what happens after that. There is currently no permanent disposal facility for high-level radioactive waste anywhere in the United States. Spent fuel simply stays on-site at commercial reactors and select Department of Energy facilities, accumulating year after year.
The scale of this accumulation is enormous. Globally, nuclear electricity production has generated roughly 390,000 metric tons of spent fuel since the first reactors came online in 1954, according to the International Atomic Energy Agency. That material doesn’t become safe on any human timescale. It requires isolation from the environment for tens of thousands of years, which is why governments have pursued deep geological repositories buried far underground. None are operational yet for commercial high-level waste in the U.S., making interim storage the default solution with no firm end date.
Uranium Mining Contaminates Soil and Water
The problems start well before fuel ever reaches a reactor. Mining and milling uranium ore produces two types of waste: solid tailings and liquid raffinates. Both remain radioactive and contain hazardous chemicals left over from the extraction process. Uranium naturally decays into radium, which in turn produces radon, a radioactive gas that seeps into the air.
When these waste materials aren’t carefully managed, the consequences spread. Wind carries radioactive dust from tailings piles into populated areas. Contaminated runoff reaches surface water used for drinking, and some mining sites have caused considerable groundwater contamination. Historically, structures built with waste rock and mill tailings became radiation hazards for anyone spending time in them, and roads paved with the material exposed travelers to radioactive dust. The Clean Air Act now limits radon releases from tailings impoundments and underground uranium mines, but legacy contamination at older sites persists.
Massive Water Consumption
Nuclear reactors generate electricity by producing steam, and that process requires enormous volumes of cooling water. U.S. nuclear plants consume approximately 400 gallons of water per megawatt-hour of electricity generated. In 2015, that added up to about 320 billion gallons consumed nationwide. Coal plants use roughly the same amount per kilowatt-hour, though individual coal facilities vary widely depending on their age and technology. Natural gas plants with modern cooling systems generally use less.
This water demand means nuclear facilities are almost always sited near large bodies of water: rivers, lakes, or coastlines. Their cooling water intake structures can trap and kill fish, larvae, and other aquatic organisms. Section 316(b) of the Clean Water Act requires the EPA to regulate the location, design, and operation of these intake structures to minimize harm to aquatic life. Compliance adds complexity and cost, and the ecological impact remains a persistent concern for communities near these plants.
Decommissioning Costs Hundreds of Millions
When a nuclear plant reaches the end of its operating life, it doesn’t simply shut down. Decommissioning involves safely removing radioactive materials, decontaminating structures, and restoring the site. The Nuclear Regulatory Commission estimates costs generally range from $300 million to $400 million per reactor, though many factors can push that figure higher. The process can take decades to complete. Plant operators are required to set aside funds during the reactor’s operating years, but shortfalls have occurred, leaving taxpayers or ratepayers to cover the gap.
Cancer Risk Near Nuclear Plants
Whether living near a nuclear power plant increases cancer risk has been debated for decades. Some large studies have found no association, while others have identified statistically significant links between residential proximity to reactors and higher cancer rates. A nationwide analysis published in Nature Communications, using U.S. mortality data from 2000 to 2018, found that counties located closer to operational nuclear power plants had higher cancer mortality rates than those farther away, even after accounting for socioeconomic, demographic, behavioral, environmental, and healthcare factors. The strongest associations appeared in older adults, particularly males aged 65 to 74 and females aged 55 to 64.
The conflicting nature of the broader research makes this a difficult question to settle. Ionizing radiation is a well-established carcinogen, and studies of nuclear disasters provide the clearest evidence. Research on Japanese atomic bomb survivors first identified excess leukemia deaths appearing about two years after exposure, followed by elevated rates of solid cancers (stomach, lung, liver, breast, thyroid, and others) emerging roughly ten years later and persisting throughout the survivors’ lifetimes. Routine reactor operations release far lower radiation levels. The NRC limits public exposure from a licensed nuclear facility to 0.1 rem (1 millisievert) per year, a fraction of the roughly 0.3 rem most Americans receive annually from natural background radiation. Whether these small chronic exposures contribute meaningfully to cancer risk over decades remains an open and actively studied question.
Reactor Safety and Core Damage
A reactor meltdown is the most dramatic risk people associate with nuclear power, though modern plants are engineered to make it extremely unlikely. The NRC uses a benchmark called core damage frequency, which estimates the probability of a serious reactor accident per year of operation. For current large reactors, that benchmark is set below 1 in 10,000 per reactor-year. In practice, most operating plants achieve rates significantly better than this threshold through redundant safety systems, containment structures, and continuous monitoring.
Still, the consequences of the rare failures that do occur are severe and long-lasting. The 1986 Chernobyl disaster and the 2011 Fukushima accident displaced hundreds of thousands of people, contaminated large areas of land, and created radioactive waste challenges that will persist for generations. These events shape public perception of nuclear power more than any statistical safety metric, and they underscore why waste management, environmental protection, and rigorous oversight remain central concerns for every operating facility.