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Nuclear Power won’t work in Global Warming World


August7, 2009
David Kraft, Director, NEIS

An oft-repeated jibe against renewable energy sources like wind and solar power by (usually) smug nuclear power proponents is, “What are you going to do when the sun don’t shine and the wind don’t blow?”

For the ump-teenth time since 1988, our organization has been forced to meet this mindless taunt with the starkly real rejoinder: “And what are YOU going to do when the rivers don’t flow?” For, just like in Illinois in 1988, 2005, and 2006; and throughout Europe several years this century, France -- the much heralded nuclear exemplar – is again facing a river water crisis that is forcing the shutdown of one-third of its entire nuclear power fleet.

Due to the current serious drought (think: “transient global warming conditions”), maintenance issues, and a worker strike, 80% nuclear-reliant France is now importing electricity from England to meet power demand. One report indicates that “20GW (gigawatts) of France’s total nuclear generating capacity of 63GW was out of service,” exactly when needed the most.

The reasons are easily understood. Fourteen of France’s 19 nuclear generating stations are sited on rivers. Reactors discharge heated water into these confined water systems, relying on that age-old deficient axiom that “the solution to (thermal) pollution is dilution.” Unfortunately for the French, during severe droughts, the rivers possess neither sufficient water volumes nor flow-rates to sufficiently dissipate the ever-growing heat build-up. Continuing operation would result in cooking the river biosystems locally and downstream.

Regulations exist in France (and elsewhere) preventing this. Powerplants are required to curtail operation or shut down completely when discharge water exceeds such a heat threshold – inconveniently, when demand for electricity is peaking.

The power output of reactors continuing to operate is also lessened during periods of drought due to higher river water temperatures. A Union of Concerned Scientists paper notes that, with higher ambient water temperatures in rivers and lakes, “…the effectiveness of the condenser in converting steam back into water decreases. As a result, steam is not “pulled” through the turbine as swiftly and less electricity is “cranked” out.”

To be fair this condition applies to any steam-cycle electricity generator, whether powered by coal, nuclear or gas. But to be equally fair, this point should be held pointblank in mind when considering new sources of electricity in a difficult to model but seemingly immanent climate-disrupted world. Wherever drought becomes the norm, the steam-cycle for power generation will compete head on with more basic human needs and uses for water. And in an agricultural state like Illinois – which already uses over 80% of its surface waters for power generation – expanding reliance on the steam-cycle becomes a liability. ( See “Drought may give a taste of the future,” Kelly Kennedy, Chicago Tribune, July 7, 2005; also from a private phone conversation with Dr. Derek Winstanley, (then) Illinois State Water Survey, on July 8, 2005.)

Before Illinoisans indulge in too much smirking and schadenfreude over France’s predicament, it’s worth noting that 1.) reactor shutdowns already happened in Illinois in 1988, and almost again in 2005-06; and 2.) 100% of Exelon’s Illinois reactors are river-dependent.

So -- what lessons can be learned from these unfortunate experiences? Well, some in the Illinois legislature think – this is a great time to build more nuclear reactors! The last two Illinois legislative sessions saw proposals to repeal what is known as the “Illinois nuclear construction moratorium.” (Or more accurately, Sec. 8-406.c of the Public Utilities Act, preventing the construction of new reactors in Illinois until such time as the federal government has a demonstrated and operating facility for the permanent disposal of high-level radioactive wastes (spent-fuel) by the reactors. )

The legendary American conscience and humorist Will Rogers once quipped that some people learn by reading; others by being told. And some – just have to pee on the electric fence for themselves. It seems to us that those advocating construction of new nuclear reactors in a climate unstable world -- where water will be THE ultimate constraining resource, and where we have ample historic evidence that reactors are less-efficient, vulnerable, or outright inoperable under expected severe drought conditions, and finally, where viable energy alternatives exist -- would fall in that third category. Which would not necessarily be such a bad thing – if they didn’t require that we all hold hands with them.

Some heat related shutdown history

Illinois, USA June 1-Aug. 31, 1988

Severe drought, exceedingly high temperatures, low river volumes and flow rates force (then) Commonwealth Edison’s Dresden and Quad Cities reactors to reduce power to 30% or shut completely in some cases. USEPA thermal discharge standards had been reached and exceeded by the reactor discharge water. Nearly 100 reactor-days of operation were thusly curtailed – precisely at a time when ComEd needed the power to meet repeated peak demands.
Source: NRC daily reactor reports, 1988

Western Europe, Summer of 2003

France, Spain, Germany and other European nations are hit with extraordinary heat wave and drought – ultimately killing over 30,000. France, Germany and Spain are confronted with the dilemma of allowing reactors to exceed design standards and thermal discharge regulations to maintain power for cooling – or shutting the reactors. Spain shuts theirs down; France and Germany allow some of theirs to exceed standards and thermal discharge regulations, while shutting others. In France local firefighters are actually called out to hose down overheating reactor containments (at Fessenheim). In the course of the summer the French nuclear reactors at Blayais on the Gironda River estuary are alone allowed to exceed thermal discharge limits 50 times.
Source: Inter Press Service, July 11, 2005

Illinois, summer of 2005-2006

During serious drought USEPA and state officials consider closing several Illinois reactors coming close to exceeding thermal discharge standards. A break in the weather and needed rains prevent EPA intervention.
Source: NEIS phone conversations with IL State Water Survey personnel

Donald C. Cook reactors, Bridgeman, MI July 30, 2006

Donald C. Cook reactors were manually shut down during severe heat wave; internal containment building temperatures exceeded regulatory limit of 120° F. for over 8 hours, and the temperature could not be reduced.
Source: NRC Event Number: 42739, 2006

Tennessee, Alabama, Georgia, SE United States Aug. 5-12, 2008

Tennessee Valley Authority lost one-third of its nuclear capacity due to the serious SE drought conditions. All 3 Browns Ferry reactors were idled to prevent overheating of the Tennessee River. Source: Chattanooga Times/Free PressFranceJuly, 2009“20GW (gigawatts) of France’s total nuclear generating capacity of 63GW was out of service” due to reaching thermal discharge limits for French rivers.
Source: The Times, July 3, 2009

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