Small Modular Reactors

Huffington PostNow that the “nuclear renaissance” is dead following the Fukushima catastrophe, when one sixth of the world’s nuclear reactors closed, the nuclear corporations — Toshiba, Nu-Scale, Babcock and Wilcox, GE Hitachi, General Atomics, and the Tennessee Valley Authority — will not accept defeat.

Their new strategy is to develop small modular reactors (SMRs), allegedly free of the dangers inherent in large reactors: safety issues, high cost, proliferation risks and radioactive waste.

But these claims are fallacious, for the reasons outlined below.

Basically, there are three types of SMRs, which generate less than 300 megawatts of electricity compared with current 1,000-megawatt reactors.

1. Light-water reactors

These will be smaller versions of present-day pressurized water reactors, using water as the moderator and coolant, but with the same attendant problems as Fukushima and Three Mile Island. Built underground, they will be difficult to access in the event of an accident or malfunction.

Because they’re mass-produced (turnkey production), large numbers must be sold yearly to make a profit. This is an unlikely prospect, because major markets — China and India — will not buy U.S. reactors when they can make their own.

If safety problems arise, they all must be shut down, which will interfere substantially with electricity supply.

SMRs will be expensive because the cost per unit capacity increases with a decrease in reactor size. Billions of dollars of government subsidies will be required because Wall Street is allergic to nuclear power. To alleviate costs, it is suggested that safety rules be relaxed, including reducing security requirements, and reducing the 10-mile emergency planning zone to 1,000 feet.

2. Non-light-water designs

These include high-temperature gas-cooled reactors (HTGRs) or pebble-bed reactors. Five billion tiny fuel kernels consisting of high-enriched uranium or plutonium will be encased in tennis-ball-sized graphite spheres that must be made without cracks or imperfections — or they could lead to an accident. A total of 450,000 such spheres will slowly and continuously be released from a fuel silo, passing through the reactor core, and then recirculated 10 times. These reactors will be cooled by helium gas operating at high very temperatures (900 degrees C).

A reactor complex consisting of four HTGR modules will be located underground, to be run by just two operators in a central control room. Claims are that HTGRs will be so safe that a containment building will be unnecessary and operators can even leave the site (“walk-away-safe” reactors).

However, should temperatures unexpectedly exceed 1,600 degrees C, the carbon coating will release dangerous radioactive isotopes into the helium gas, and at 2,000 degrees C the carbon would ignite, creating a fierce, Chernobyl-type graphite fire.

If a crack develops in the piping or building, radioactive helium would escape, and air would rush in, also igniting the graphite.

Although HTGRs produce small amounts of low-level waste, they create larger volumes of high-level waste than conventional reactors.

Despite these obvious safety problems, and despite the fact that South Africa has abandoned plans for HTGRs, the U.S. Department of Energy has unwisely chosen the HTGR as the “next-generation nuclear plant.”

3. Liquid-metal fast reactors (PRISM)

It is claimed by proponents that fast reactors will be safe, economically competitive, proliferation-resistant, and sustainable.

They are fueled by plutonium or highly enriched uranium and cooled by either liquid sodium or a lead-bismuth molten coolant. Liquid sodium burns or explodes when exposed to air or water, and lead-bismuth is extremely corrosive, producing very volatile radioactive elements when irradiated.

Should a crack occur in the reactor complex, liquid sodium would escape, burning or exploding. Without coolant, the plutonium fuel could reach critical mass, triggering a massive nuclear explosion, scattering plutonium to the four winds. One millionth of a gram of plutonium induces cancer, and it lasts for 500,000 years. Extraordinarily, they claim that fast reactors will be so safe that they will require no emergency sirens, and that emergency planning zones can be decreased from 10 miles to 1,300 feet.

There are two types of fast reactors: a simple, plutonium-fueled reactor and a “breeder,” in which the plutonium-reactor core is surrounded by a blanket of uranium 238, which captures neutrons and converts to plutonium.

The plutonium fuel, obtained from spent reactor fuel, will be fissioned and converted to shorter-lived isotopes, cesium and strontium, which last 600 years instead of 500,000. The industry claims that this process, called “transmutation,” is an excellent way to get rid of plutonium waste. But this is fallacious, because only 10 percent fissions, leaving 90 percent of the plutonium for bomb making, etc.

Then there’s construction. Three small plutonium fast reactors will be grouped together to form a module, and three of these modules will be buried underground. All nine reactors will then be connected to a fully automated central control room operated by only three operators. Potentially, then, one operator could face a catastrophic situation triggered by loss of off-site power to one unit at full power, another shut down for refueling and one in startup mode. There are to be no emergency core cooling systems.

Fast reactors require a massive infrastructure, including a reprocessing plant to dissolve radioactive waste fuel rods in nitric acid, chemically removing the plutonium, and a fuel fabrication facility to create new fuel rods. A total of 15 to 25 tons of plutonium are required to operate a fuel cycle at a fast reactor, and just five pounds is fuel for a nuclear weapon.

Thus fast reactors and breeders will provide extraordinary long-term medical dangers and the perfect situation for nuclear-weapons proliferation. Despite this, the industry plans to market them to many countries.

Originally published: http://www.huffingtonpost.com/helen-caldicott/small-modular-reactors_b_5653378.html

3 Responses to Small Modular Reactors

  1. Evelyn Sahaja 21 May 2015 at 7:08 pm #

    Germany is very close to meeting its power needs with solar and wind, and yet it has limited land mass and foggy weather. If they’ve done it, we all are able. They’ve shut down their nuclear.

  2. Daniel Roberts 7 October 2014 at 9:11 pm #

    We need to scale up the use and manufacture of wind and solar energy sources to make them more attractive than nuclear sources. If it’s all about money let’s make more financially attrative to invest in renewables.

  3. Elizabeth Frye 19 August 2014 at 1:34 am #

    I cannot understand whereas South Africa has decided to leave them alone due to safety–why oh why does the U.S. persist. Is there not a group who are working against it? It is no doubt as “the love of money is the root of all evil”, that there are a few who want to make money on it,without a care for the future damages.If even I can see this, surely anyone else reading this would too.
    We just so appreciate those as Dr. Caldicott and Leuren Moret,Kevin Kamps and Fairewinds trying to get information out to the public.
    Thank you.

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