INES-event
INES 1

SHORT VIOLATION OF LIMITS AND CONDITIONS DUE TO ONE AND A HALF HOUR UNAVAILABILITY OF 2 OUT OF 3 SAFETY SYSTEMS

On May, 2, 1995 the operational limits and conditions (L&C) were violated for one and a half hours because of a human error. The first safety system (diesel generator) was not put in the stand-by state after testing and the third safety system was prepared for a test. Only one of three safety systems (one system is enough to fulfill a safety function) was fully available. The L&C require full availability (two out of three systems). The staff found out this violation later and reported it to the regulatory body.
Basis for rating:
The event involved operation outside opeational limits and conditions for a short time and hence it is rated as level 1 as per clause III.2.4.1 (box C1 of Table 1) of INES user's manual.

Location: DUKOVANY-1
Event date: Tue, 02-05-1995
Nuclear event report
Legenda & explanation