Our Arklahoma Heritage: “Nobody told us until days later...we live six miles from the plant, and that’s too close for comfort.”

A routine maintenance error at Arkansas Nuclear One (ANO) in Russellville, Arkansas, brought the region to the brink of a nuclear disaster, exposing safety flaws and raising questions about the potential devastation of a meltdown or explosion at the plant.

The incident, while contained, underscored the risks to Pope County and beyond, prompting urgent calls for improved oversight at the nation’s nuclear facilities.

On March 26, 1978, during a refueling outage at ANO’s Unit 1, a worker accidentally dropped a 600-pound steel socket while servicing the reactor’s steam generator.

The socket fell 30 feet, striking and damaging an instrument line critical to the reactor coolant system. The breach caused a loss of coolant pressure, triggering an automatic reactor shutdown.

Radioactive gases were released into the containment building, with Arkansas Power & Light (AP&L) reporting that a small amount escaped into the environment, though within regulatory limits. The Nuclear Regulatory Commission (NRC) later confirmed no immediate public health risk, but the incident revealed how a single human error could spiral toward catastrophe.

The damaged line disrupted the plant’s ability to monitor coolant levels, a safeguard against a core meltdown. Backup systems activated, averting disaster, but the event exposed inadequate maintenance protocols and worker training at ANO, a Babcock & Wilcox pressurized water reactor (PWR) operational since 1974.

The NRC fined AP&L $10,000 and mandated a safety review, keeping Unit 1 offline for weeks at a cost of millions. “It was a close call,” said Russellville Mayor Bill Eaton in a 1978 Arkansas Gazette interview. “We’re lucky it didn’t escalate.”

Had the incident led to a meltdown—where the reactor core overheats and potentially breaches containment—the impact could have been severe. Within a 10-mile radius, encompassing Russellville, London, and Lake Dardanelle, approximately 44,000 residents would have faced evacuation.

Radioactive isotopes like iodine-131 and cesium-137 could have contaminated air, water, and soil, posing long-term health risks such as thyroid cancer. Lake Dardanelle, vital for cooling and local fishing, would have been heavily polluted, disrupting water supplies and ecosystems.

Beyond 10 miles, up to 50 miles, including Conway and Morrilton, low-level fallout could have affected 308,000 people, damaging agriculture and causing economic losses.

While less severe than Chernobyl’s 30-mile exclusion zone, a meltdown could have rendered parts of Pope County uninhabitable for years, with national repercussions for nuclear policy, as seen after Three Mile Island in 1979.

An explosion, though less likely, was also a concern. A hydrogen or steam explosion from core damage could have damaged the containment building, releasing radioactive gases.

The immediate 2-mile radius, including the ANO site and nearby lakefront, would have seen structural damage and acute radiation risks to workers and ~1,000 residents. Within 10 miles, Russellville’s 44,000 residents might have required sheltering or evacuation, with Lake Dardanelle facing contamination. Unlike a meltdown, an explosion’s impact would likely be confined to 1–10 miles, with cleanup feasible within months if containment held.

The 2013 ANO crane collapse, which caused a small explosion in an electrical cabinet, illustrates the risk of secondary blasts, though it was far less severe.

Local reaction was swift and fearful.

“Nobody told us until days later,” said Russellville resident Martha Hayes in a 1978 interview. “We live six miles from the plant, and that’s too close for comfort.”

The incident strained trust in ANO, a major employer contributing ~$190 million annually to Pope County’s economy but a source of unease for its 20,000 residents. AP&L implemented stricter maintenance procedures, and the NRC’s review led to nationwide safety improvements.

The Arkansas Department of Health’s Nuclear Planning and Response program, later established, now designates evacuation routes to Hector and Morrilton schools for the 10-mile zone, a direct response to such risks.

The 1978 incident, while contained, highlighted ANO’s vulnerabilities in the 1970s, when safety standards lagged behind modern protocols. The NRC’s 2010 risk assessment estimated a 1-in-243,902 annual chance of earthquake-induced core damage, suggesting low but real risks.

A meltdown or explosion would have transformed Russellville from a quiet town into a cautionary tale, with impacts rippling across Arkansas’ ~308,000 residents within 50 miles and beyond.