Just how dangerous are nuclear power plants? Part 2

This article is the second part of a Freeing Energy series looking at nuclear power. In part 1, I explored the scope of nuclear power across the world. I examined costs and explained nuclear’s role as “baseload” power. In this article, I will dive into the safety of nuclear power plants. 

China syndrome movie posterNuclear power has a unique challenge. While it’s much safer than most people realize, it easily conjures up thoughts of meltdowns, sickness, and bombs. Decades of movies and the occasional nuclear disasters have kept these fears at the forefront of people’s minds. Up until recently, the future of nuclear power looked grim. However, the growing concern over greenhouse gases has put nuclear back in the spotlight as a possible source of carbon-free electricity.

For nuclear power plants to be more widely adopted in the U.S. and Europe, a more objective assessment of their risks is required. Let’s take a closer look at four of the most common disaster scenarios and try to understand the underlying risks.

#1 – Can fuel from a nuclear power plant be used for a bomb?

The most terrifying scenario is all too common in modern action movies. Terrorists break into a well-guarded facility, steal some nuclear material, and use it to create a thermonuclear weapon. But is this really possible to do this with the nuclear fuel used in power plants? Depending on who you ask, this is either extremely difficult or outright impossible. Thermonuclear bombs require incredibly pure uranium or plutonium, 90% or higher. Power plant fuel is less than 10% pure. A 1997 U.S. government report determined it was technically possible to use power plant fuel to make a thermonuclear weapon, but it also found there were far simpler ways to create bomb-grade material.

A more feasible scenario is a “dirty bomb” which combines nuclear fuel with a traditional explosive. Such a device has the potential to disperse radioactive material across a wide geographic area. The actual impact of a dirty bomb varies widely depending on weather patterns, geography, size of the bomb and the fuel being used. But, overall, it’s likely that resulting public panic would be far worse than any direct damage from the radioactive fallout.

#2 – How dangerous are the materials or gases that might escape during a nuclear meltdown?

Like a dirty bomb, the impacts of a meltdown-triggered radiation cloud vary widely. Not surprisingly, the one major incident, the 1986 Chernobyl meltdown, has been extensively studied. The U.S. National Cancer Institute followed 12,500 people exposed at Chernobyl. Since the human thyroid gland readily absorbs radioactive iodine, thyroid cancer is the most common health impact from fallout. Over the following 30 years, about 30 of these people came down with thyroid cancer attributable to the accident. Since the half-life of radioactive iodine is only eight days, scientists believe that quick distribution of iodine pills could block the body’s ability to absorb this radioactive material in the early weeks, thus reducing long-term cancers. Other studies show a more significant but still surprisingly small long-term impact. For example, one group found up to a 3% increase in the incidents of lifelong cancers attributable to Chernobyl’s radioactive fallout.

#3 – What are the other, non-radiation impacts from nuclear accidents?

Nuclear advocates proudly point out that there are virtually no deaths directly attributable to nuclear accidents, at least since Chernobyl. And while uranium miners die from accidents and long-term health issues every year, the nuclear fuel supply chain is hands down safer than fossil fuels.

Death rates from energy proudction
Source: Our World in Data

Even though the direct loss of life is relatively small, the number of people indirectly impacted by nuclear accidents is large. For example, 130,000 people were evacuated after Fukushima. And, an estimated 1,600 of them died in the relocation process (notably, most of the deaths occurred with people over 65). Nuclear advocates respond to this saying that much of that relocation was an overreaction by disaster response officials unfamiliar with the real health risks of radiation. Either way, the tragedy of lost lives is dwarfed by the 15,000 deaths directly attributable to the earthquake and subsequent tsunami that set off the Fukushima disaster in the first place.

#4 – How likely are nuclear accidents?

There have been several close calls, but only three nuclear accidents have warranted global headlines: the Three Mile Island accident in 1970, the Chernobyl disaster in 1986, and the Fukushima disaster in 2011. Nuclear advocates like to point out the number of incidents is small. Nuclear critics respond by pointing out that if three, or even one, out of every 440 commercial jets catastrophically failed during their lifetimes, airlines would surely be out of business.

The probability of another major nuclear accident is low. And, even if one occurs, the odds are that it will be contained as it was at Three Mile Island. But as long as catastrophic disasters are possible, people and politicians will continue to have reservations.

For me, the risk of nuclear power is like the risk of walking across a busy highway. While the odds are pretty good that you’ll make it safely across, the question is whether you really need to do it at all.


In my upcoming, third article, I will dive into environmental impacts like waste storage and water usage. Stay tuned.

If you want to be sure and receive the final updates in this series, please share your email address below. 

6 thoughts on “Just how dangerous are nuclear power plants? Part 2

  1. I think that Amory Lovins’ argument that present nuclear designs are not economically sound, has merit, But the conclusion that nuclear should be abandoned is not warranted. More research into fission and especially fusion may well result in designs that are economically sound, and sufficiently safe.

    I hope that, in a decade or so, some new, smaller, reactors can augment the Freeing Energy goals of distributed energy production.

    1. Newt, small, modular reactors (SMRs) are touted as the future of nuclear. That being said. my nuclear expert friends are not optimistic that SMRs will be a whole lot cheaper because so much of the cost is from regulations and safety requirements. While the idea is really appealing from a local energy perspective, I’m concerned that going from 60 nuclear plants to hundreds means there will be a lot more land transportation of fuels/waste and more sources of accidents or terrorist targets. Given that radiation seems to be the largest driver of public concern, it’s not clear that building 10x more reactors won’t aggravate public opinion even further. Do you think the industry can turn around public concerns?

    2. Bill,

      Your expert friends raise a good point about how all the (excessive) regulations and requirements may make SMR’s cost too high, especially given the lack of economy of scale. On the other hand, these reactors’ inherent lack of hazard *should* make most of those requirements unnecessary. In fact, the *main* reason to hope that SMRs will be more economical is that their inherent lack of hazard will finally provide sufficiently obvious justification for reducing these nuclear requirements to a sane level, more in line with those applied to other industries and competing energy sources. The fact that NRC is considering allowing SMRs (e.g., NuScale) to have no Emergency Planning Zone (beyond the plant site boundary) is a promising sign.

      Developers are saying that all components could fail and a meltdown would still not result. Also, due to the small size and geometry, even if a meltdown were to somehow occur, radiation levels above the range of natural background would not occur anywhere outside the plant site (as the EPZ decision suggests).

      Given that these reactors are essentially incapable of hurting anyone, one has to ask why such strict requirements are necessary.

      The amount of spent fuel, and number of shipments, would scale with the overall amount of power generated. So, SMRs would not cause the number of shipments to increase. Also, they may decide to cluster larger numbers of SMRs on a given plant site (perhaps even our existing sites). Finally, the risks associated with nuclear waste transportation are utterly negligible, especially compared to shipments of other hazardous materials. There has literally never been a significant release.

      As for turning around public concerns, one thing is clear. Trying to allay public concerns by treating small issues/hazards as though they were large ones is counter-productive.

  2. Jim,

    You make a lot of great points here. From where I sit, it seems that two big things have to occur for nuclear (SMR or conventional Gen III, or Gen IV) to become viable in the U.S. First, regulations would have to be relaxed to make the plants more cost competitive with natural gas and solar/wind. Second, public opinion would have be more balanced. Unfortunately, if we relax the first one, we’ll likely only make the second one worse.

    Frankly, I’m skeptical we’ll see any relaxing of regulations. While it’s true that the plants are far safer, skeptics would point out that earlier generation plants were widely proclaimed to be entirely safe. That turned out to be optimistic. I fear it’ll likely take a decade or more of operating history for any new generation plant to be able to ask for relaxed oversight.

    All eyes should be on China and India. Their decisions about nuclear power will do more to affect greenhouse gases than anything we do in the U.S.

  3. It may seem a bit cynical, but I think that any new technology should be tried in a foreign country first, simply for regulatory reasons. When successful, economic energy production, can be demonstrated there, it will be harder to argue against an installation here.

Leave a Reply