The country has significant environmental problems, especially those resulting from the Chernobyl nuclear power plant disaster in 1986 and from industrial pollution. In accordance with its previously announced plans, Ukraine permanently closed the Chernobyl Atomic Energy Station in December 2000. In November 2001, Ukraine withdrew an application it had made to the EBRD for funding to complete two new reactor units to compensate for the energy once produced by Chernobyl. Ukrainian concern over reform conditions attached to the loan - particularly tariff increases needed to ensure loan repayment—led the Ukrainian government to withdraw the application on the day the EBRD Board was to have considered final approval. Work on the so-called "object shelter" to permanently entomb the reactor where the world's worst nuclear accident occurred has been slower than anticipated but continues. Design work as well as structural improvements to the "sarcophagus" erected by the Soviet Union are largely complete, and construction on the new shelter was scheduled to begin in 2004.