The dirty history of ‘Nukey Poo’, the reactor that soiled the Antarctic

The rekindled nuclear debate in Australia has stirred old memories in some of a little-known chapter of our region’s history, when the US Navy quietly installed what today we might call a small modular reactor at the US Antarctic base on Ross Island.

The machine, nicknamed “Nukey Poo” by the technicians who looked after it, was installed at McMurdo base in 1961, when Antarctic exploration was expanding and nuclear energy had developed a bright futuristic sheen.

Components of the PM-3A nuclear reactor, later given the nickname “Nukey Poo”, arrive in Antarctica in 1961.

Things did not end well.

Back then, as now, Antarctic missions relied upon lifelines with distant homes. Supplies had to be carried long and sometimes dangerous distances. The US kept its Antarctic sites supplied via an ongoing supply mission called Operation Deep Freeze, which was based at the McMurdo Naval Air Facility.

According to an article on the Nukey Poo incident published in 1978 by the Bulletin of the Atomic Scientists – a journal concerned with the potential danger of nuclear technology, founded by Albert Einstein and veterans of the Manhattan Project – while a gallon of diesel cost the US Navy US12¢ back then, by the time the Americans shipped supplies to McMurdo, diesel cost 40¢ a gallon. At South Pole station, diesel was worth $12 a gallon.

Howard Dengate as a field assistant in the Antarctic in 1973.Credit: Colin Monteath

But the then US Atomic Energy Commission had a solution to save costs on transporting supplies. What if McMurdo, and other distant US bases, were supplied by small transportable nuclear reactors? Congress agreed and soon the Martin Marietta Corporation won a contract to build them.

In an advertisement in Scientific American, the company boasted in language reminiscent of today’s debate over modular reactors that “because nuclear energy packs great power in little space, it’s extremely useful when you need electricity in remotes spots. It’s portable and gives you power that last for years ...” Soon, the company said, nuclear power might be carrying us to outer space and frying our eggs.

A reactor named PM-3A (PM stood for “portable, medium powered”) was shipped out in sea crates and installed at McMurdo – which is within New Zealand-claimed Antarctic territory – over the summer of 1961 and became known on the base as Nukey Poo. Because cement would not cure in the frigid climate, the reactor was not encased in concrete, rather its four major components sat in steel tanks embedded in gravel and wrapped in a lead shield.

Admiral George Dufek described the moment as “a dramatic new era in man’s conquest of the remotest continent”. The US administration was certain the reactor did not violate the Antarctic Treaty’s declaration that “any nuclear explosions in Antarctica and the disposal there of radioactive waste material shall be prohibited”.

Within a year, Nukey Poo caused its first fuss, a hydrogen fire in a containment tank that led to a shutdown and energy shortages. Icebreakers fought to break through and fuel for generators was delivered by helicopter, which burned as much as they delivered over the course of a flight. Over the following years, Nukey Poo proved so unreliable and expensive to maintain that the military gave up hopes of using the technology to displace diesel at other remote locations.

McMurdo Station in 1965, with the buildings housing the reactor in the foreground.

In 1972, the navy began the three-year task of decommissioning the reactor and decontaminating the site. During that process, they discovered corrosion that technicians feared may have caused leaks of irradiated material. No detailed investigation was done. The secretary of the US National Academy of Sciences said the program was ended due to a series of malfunctions and the possibility of leaks, the Bulletin of the Atomic Scientists reported. The New Zealand government declared the decision was economic.

Either way, it was decided not only to remove the reactor, but half the hillside it was built into. Eventually 12,000 tonnes of irradiated gravel and soil was removed on supply ships to be buried in concrete lined pits in the United States.

The young Australian scientist, Dr Howard Dengate, who had run one of the NZ bases, hitched a lift on one those ships, the Schuyler Otis Bland, in 1977. Dengate recalls a grumpy captain who once swore at him for inviting bad luck on the ship by whistling on deck. The captain, Dengate recalled this week, blamed him for “whistling up” the storm that struck the vessel before the Australian disembarked in New Zealand and the ship sailed on to the US.

Though the reactor was little discussed in the wider world, no secret was made on the base of the reactor or its impact. Indeed, Dengate recalled finding an operating manual for the reactor in the American rubbish pits that New Zealanders had developed the habit of fossicking in.

But the story did not end there.

In 2011, an investigation by journalists of News 5 Cleveland found evidence that McMurdo personnel were exposed to long-term radiation, and in 2017 compensation was paid to some American veterans of the base. A year later, New Zealand officials announced that it was possible that New Zealand staff were also affected.

It has since been reported that four New Zealanders had raised claims about their ill health since their time in the Antarctic.

In 2020, the Waitangi Tribunal, a permanent commission in New Zealand to investigate cases against the Crown, launched inquiries. They are not yet complete.

Asked if he was concerned about travelling with the irradiated material, Dengate said he was not. “We were young and dumb and adventurous,” he told this masthead of his time in the Antarctic.

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