FY2021 Number of assessment from Domestic Operating Experience

（2021.3.21～2022.3.19）

NUCIA Classification Number Significance
A+ A B++ B+ B! B a+ a b++ b+ b! b C D
Trouble Information 1       --   1           -- -- --
Maintenance Quality Information 54       2   35           17 -- --
Other Information 126 -- -- -- -- -- 4 -- -- -- -- -- 3 41 78
total 181       2   40           20 41 78
1. Event needs extent of condition
Significance Information sharing
(Significant event)		 Information sharing
(Event)
A+ A B++ B+ B! B
Category Significant event occurring repeatedly
(Recurrent significant event)		 Event having significant influence on nuclear safety
（Significant Event）		 Recurrent
event occurring repeatedly
(Event recurring significant recurrent )		 Recurrent monitoring
Event having possibility
to recur
(Recurrent event)		 Alerted
event having
possibility to recur
similar events
(Alerted recurrent event）		 Other of A+ ~ B! event although it needs extent
of condition
NUCIA Classification In principle, Trouble information (T-information), Maintenance quality information (M-information)
2. Event does not need extent of condition
Significance Information sharing (Significant event) Information sharing (Event) Reference information -
a+ a b++ b+ b! b C D
Category Significant event occurring repeatedly
(Recurrent significant event)		 Event having significant influence on nuclear safety
(Significant Event)		 Recurrent event occurring repeatedly
(Event recurring significant recurrent )		 Recurrent monitoring Event having possibility to recur
(Recurrent event)		 Alerted event having possibility to recur similar events
(Alerted recurrent event)		 Other of a+ ~ b! event although it needs extent of condition Reference information　although it does not need extent of condition Event having no lesson
NUCIA Classification In principle, Trouble information (T-information), Maintenance quality information (M-information) Other information
(S-information)