The explosion of reactor number four on April 26, 1986, spewed poisonous radiation over large parts of Europe, particularly Ukraine, Belarus and Russia.
At 1:23 am (local time), the exact time of the explosion, hundreds of people placed flowers and candles in the dark yesterday, at the foot of a monument in Slavutych, a town 50 kilometres from the plant.
Slavutych was built to rehouse Chernobyl workers who had lived near the plant and were forced to move further away after the disaster.
The human toll of the disaster is still disputed.
United Nations experts officially recognised 31 deaths among plant workers and firefighters directly linked to the blast.
But environmental group Greenpeace has suggested there would be around 100,000 additional cancer deaths caused by the disaster.
The Soviet authorities of the time dispatched hundreds of thousands of people to put out the fire and clean the site, without proper protection.
They hastily laid over the reactor site a concrete cover dubbed "the sarcophagus", which is now cracking and must be replaced.
The UN Action Plan on Chernobyl will come to an end on December 31 and so UN officials have initiated a series of consultations "to define the vision for post-2016 international cooperation", it added.
Ban called for "a forward-looking strategy designed to further help the recovery of the affected areas and to work together for greater nuclear safety worldwide."
Poroshenko yesterday inspected ongoing work on a new 20,000-tonne steel cover -- a project estimated to cost more than two billion euros (USD 2.2 billion).
The structure will contain technology that will act beneath the cover to decontaminate the area once the steel layer is in place. Officials say the new cover will last for 100 years.
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