Search - Number 4 - ACCIDENT ON THE CHERNOBYL NUCLEAR POWER PLANT, OCTOBER 1991: FACTS AND CAUSES

ACCIDENT ON THE CHERNOBYL NUCLEAR POWER PLANT, OCTOBER 1991: FACTS AND CAUSES
Cover not present ACCIDENT ON THE CHERNOBYL NUCLEAR POWER PLANT, OCTOBER 1991: FACTS AND CAUSES
Category: Number 4
Publication: 4
Summary

An account is given of the unique accident caused by a spontaneous switching of a 330 kV breaker and a full voltage energizing of the practically stand-still non-excited 500 MW turbine generator № 4 at Chernobyl NPP. The subsequent asynchronous mode of operation resulted in a severe non-reparable damage, hydrogen explosion, fault at the terminals and a fire-induced collapse of a machine-hall roof. The analysis has shown that, although the accident was aggravated by a number of casual factors, the main cause of its gravity stems from the ignorance of the probability of a non-sanctioned regime of the asynchronous run of the generator, a mistake committed at the stage of the conceptual development of the typical projects of relay and protection systems of large power blocs.