KIEV (Reuters) - Ukraine held memorial services on Tuesday to mark the 30th anniversary of the Chernobyl nuclear disaster which permanently poisoned swathes of eastern Europe and highlighted the shortcomings of the secretive Soviet system.
In the early hours of April 26, 1986, a botched test at the nuclear plant in then-Soviet Ukraine triggered a meltdown that spewed deadly clouds of atomic material into the atmosphere, forcing tens of thousands of people from their homes.
President Petro Poroshenko attended a ceremony at the Chernobyl plant, which sits in the middle of an uninhabitable 'exclusion zone' the size of Luxembourg.
"The issue of the consequences of the catastrophe is not resolved. They have been a heavy burden on the shoulders of the Ukrainian people and we are still a long way off from overcoming them," he said.
More than half a million civilian and military personnel were drafted in from across the former Soviet Union as so-called liquidators to clean-up and contain the nuclear fallout, according to the World Health Organization.
Thirty-one plant workers and firemen died in the immediate aftermath of the accident, most from acute radiation sickness.
Over the past three decades, thousands more have succumbed to radiation-related illnesses such as cancer, although the total death toll and long-term health effects remain a subject of intense debate.
Nikolay Chernyavskiy, 65, who worked at Chernobyl and later volunteered as a liquidator, recalls climbing to the roof of his apartment block in the nearby town of Prypyat to get a look at the plant after the accident.
"My son said 'Papa, Papa, I want to look too'. He's got to wear glasses now and I feel like it's my fault for letting him look," Chernyavskiy said.
The anniversary has garnered extra attention due to the imminent completion of a giant 1.5 billion euros ($1.7 billion) steel-clad arch that will enclose the stricken reactor site and prevent further leaks for the next 100 years.
The project was funded with donations from more than 40 governments and the European Bank for Reconstruction and Development.
Even with the new structure, the surrounding zone - 2,600 square km (1,000 square miles) of forest and marshland on the border of Ukraine and Belarus - will remain uninhabitable and closed to unsanctioned visitors.
The disaster and the government's reaction highlighted the flaws of the Soviet system with its unaccountable bureaucrats and entrenched culture of secrecy. For example, the evacuation order only came 36 hours after the accident.
Former Soviet leader Mikhail Gorbachev has said he considers Chernobyl one of the main nails in the coffin of the Soviet Union, which eventually collapsed in 1991.
(Additional reporting by Margaryta Chornokondratenko, Sergei Karazy and Andriy Perun; Editing by Robert Birsel and Richard Balmforth)
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