INES-event
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Fire in the A110/2 cable corridor

On 22/06/2001 at 11:21 fire alarm signal was annunciated on unit 2, from the three reactor building cable rooms A110/2, A018/2 and A019/2. Immediate actions were taken to inspect the rooms. Meanwhile failure signals were received from some affected busses and at 11:34 RCP 6 tripped. At 11:35 fire fighting was commenced with the installed fire water system. At 11:40 unit power reduction was started, at 11:50 the turbines were tripped. Due to failure on temperature measuring circuits of the bearing of RCPs 2 and 4, these pumps were stopped. Since the values of RCP 1 and 4 seal flow parameters became non-real this emergency command signal was blocked. At 11:48 the fire alarm ceased therefore the fire extinguishing system was shut down and the site inspection was commenced. At 12:25 the reactor was at minimum controlled power level, after that boron injection into the primary circuit was started. The site inspection revealed that fire occurred in the vertical cable shaft A110/2, at elevation of 14 m. After having extinguished the fire completely personnel proceeded to take up the list of and inspect the deenergized equipment. The fire led to loss of power of the valves on make-up water header TK52 and on leg TE01 of the reactor water purification system as well as to loss of position indication of some of the Y safety system isolation valves. Several process parameter measuring circuits failed or non-real values were indicated.

Location: PAKS-2
Event date: Fri, 22-06-2001
Nuclear event report
Legenda & explanation