KIEV, Ukraine — Want a better understanding of the world’s worst nuclear disaster? Come tour the Chernobyl nuclear power plant.

Beginning next year, Ukraine plans to open the sealed zone around the Chernobyl reactor to visitors who wish to learn more about the tragedy that occurred nearly a quarter of a century ago, the Emergency Situations Ministry said Monday.

Additional Photos

The Chernobyl nuclear power plant looms over empty houses in the town of Pripyat, Ukraine. Next year, the government will open the contaminated zone around the reactor to visitors who want to learn more about the nuclear tragedy that occurred there in 1986. The Associated Press

Chernobyl’s reactor No. 4 exploded on April 26, 1986, spewing radiation over a large swath of northern Europe. Hundreds of thousands of people were resettled from areas contaminated with radiation fallout in Ukraine, Belarus and Russia. Related health problems still persist.

The so-called exclusion zone, a highly contaminated area within a 30-mile radius of the reactor, was evacuated and sealed off in the aftermath of the explosion. All visits were prohibited.

Today, about 2,500 employees maintain the remains of the now-closed nuclear plant, working in shifts to minimize their exposure to radiation. Several hundred evacuees have returned to their villages in the area despite a government ban. A few firms now offer tours to the restricted area, but the government says those tours are illegal and their safety is not guaranteed.

Emergency Situations Ministry spokeswoman Yulia Yershova said experts are developing travel routes that will be both medically safe and informative for Ukrainians as well as foreign visitors. She did not give an exact date when the tours were expected to begin.

“There are things to see there if one follows the official route and doesn’t stray away from the group,” Yershova told The Associated Press. “Though it is a very sad story.”

Helen Clark, chief of the United Nations Development Program, toured the plant Sunday and said she supported the plan because it could help raise money and tell an important lesson about nuclear safety.

“Personally I think there is an opportunity to tell a story here and of course the process of telling a story, even a sad story, is something that is positive in economic terms and positive in conveying very important messages,” Clark said.

The ministry also said Monday it hopes to finish building a new safer shell for the exploded reactor by 2015. The new shelter will cover the original iron-and-concrete structure hastily built over the reactor that has been leaking radiation, cracking and threatening to collapse.

The new shell is 345 feet tall, 853 feet wide and 490 feet long. It weighs 20,000 tons and will be slid over the old shelter using rail tracks.

The cost of project, financed by international donors, has risen from $505 million to $1.15 billion because of stricter safety requirements, according to Ukrainian officials.

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