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Provides incident information by cause, system and plant.


Recent Nuclear Events

Shows the status of events categorized by unit, date of event and title.
Cause : H(Human), M(Mechanical), E(Electrical), I&C(Instrumentational), eX(External Effect), etc(etc)

Recent Nuclear Events

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Recent Nuclear Events table
providing that No., Unit, Date, Details, Failed System, Cause
No. Unit Date Details Failed System Cause
1 2 Etc H M E I&C eX Etc
1 Kori-2 2022-06-03 1
2 Hanbit-2 2022-04-16 2 E
3 Hanul-1 2022-03-16 2 M
4 Hanul-6 2022-03-04 1 eX
5 Hanbit-6 2022-02-05 2 E
6 Hanul-5 2022-01-13 1 E
7 Shin-Kori-1 2021-11-11 2 E
8 Kori-3 2021-07-12 2 M
9 Shin-Kori-3 and 1 unit 2021-06-22 2 E
10 Shin-Kori-4 2021-05-29 2 E
11 Kori-2 2021-04-23 2 H
12 Hanul-1 2021-04-06 2 eX
13 Hanul-2 2021-04-06 2 eX
14 Hanul-1 2021-03-22 2 eX
15 Hanul-2 2021-03-22 2 eX
16 Wolsong-4 2021-03-12 1 I&C
17 Hanbit-5 2020-10-26 Automatic Reactor Trip due to High Water Level of Steam Generator #2 2 M
18 Hanul-1 and 1 unit 2020-09-07 High Radioactivity Detection in Condensate Receiver Tank for Liquid Waste Evaporator 1 M
19 Kori-4 2020-09-03 Automatic Reactor Trip and Startup of Emergency Diesel Generators due to Effect of Typhoon Maysak 1 eX
20 Kori-2 2020-09-03 Automatic Actuation of Emergency Diesel Generators due to Effect of Typhoon Maysak 1 eX
21 Kori-3 2020-09-03 Automatic Reactor Trip and Startup of Emergency Diesel Generators due to Effect of Typhoon Maysak 1 eX
22 Kori-1 2020-09-03 Automatic Actuation of Emergency Diesel Generators due to Effect of Typhoon Maysak 1 eX
23 Shin-Kori-2 2020-09-03 Automatic Reactor Trip and Actuation of Emergency Diesel Generators due to Effect of Typhoon Maysak 1 eX
24 Shin-Kori-1 2020-09-03 Automatic Reactor Trip and Actuation of Emergency Diesel Generators due to Effect of Typhoon Maysak 1 eX
25 Hanul-6 2020-07-19 Automatic Reactor Trip due to Two Reactor Coolant Pumps Trip 2 H
26 Hanul-2 2020-07-04 Manual Turbine/Generator Trip and Reactor Power Reduction due to Abnormal Chemistry Condition for Secondary System 2 M
27 Shin-Wolsong-2 2019-09-06 Automatic Reactor Trip due to Low Water Level of Steam Generator #1 2 H
28 Hanbit-3 and 1 unit 2019-07-11 Fire at Dryer during Drying Process of Decontamination Papers in Radioactive Waste Building etc etc
29 Hanbit-1 2019-05-10 Auxiliary Feedwater System Actuation and Manual Reactor Trip due to Careless Withdrawal of Control rods 1 H
30 Hanbit-1 2019-03-09 Fire at Thermal Insulator of Reactor Coolant Pipe during Hot Stand-by for Restarting 1 M
31 Hanul-6 2019-03-08 Injury of Reactor Building Worker during O/H etc etc
32 Kori-4 2019-02-20 Power Reduction due to Drop of Control Rod 1 E
33 Hanbit-2 2019-01-24 Automatic Reactor Trip due to Low Level of Steam Generator ‘C’ 2 H
34 Wolsong-3 2019-01-21 Automatic Reactor Trip by Primary Heat Transport Pump #1 Trip due to Surge Capacitor Damage 1 E
35 Hanbit-1 2019-01-03 Smoke at Air Supply Fan in Switchgear Building 2 E
36 Hanbit-3 2018-11-11 Spark at concent during maintenance in containment building 1 E
37 Hanul-1 and 1 unit 2018-10-06 Declaration of an alert according to gale alarm and warning light by typhoon etc eX
38 Hanul-3 and 1 unit 2018-10-06 Declaration of an alert according to gale alarm and warning light by typhoon etc eX
39 Hanbit-2 2018-09-16 Activation of smoke detector by fire extinguisher powder in access control building 2 E
40 Hanul-4 2018-08-31 Manual reactor shutdown for cause analysis and maintenance for the discharge flow decline of main feedwater pump 2 M
41 Shin-Kori-3 2018-08-21 Automatic reactor trip due to drop of control rod during operability test of control element assembly 1 I&C
42 Kori-4 2018-08-05 Reactor coastdown for maintenance of control fluid leakage of main steam isolation valve 2 M
43 Hanul-2 2018-07-12 Automatic reactor trip by manual turbine trip due to the opening of moisture separator reheater’s rupture disk and high water level in steam generator 2 M
44 Wolsong-3 2018-06-11 Reactor coolant leakage by mistake to control pressurizer drain valve 1 H
45 Hanul-6 2018-06-03 Automatic reactor scram by reactor coolant pump trip according to malfunction of a circuit board of plant control system 1 I&C
46 Kori-3 2018-05-11 Automatic startup of motor-driven auxiliary feedwater pump during plant startup 2 I&C
47 Hanbit-2 2018-03-06 Automatic startup of emergency diesel generator ‘B’ by loss of voltage on 4.16 kV safety bus ‘B’ 1 H
48 Wolsong-4 2018-01-24 Opening emergency water supply system isolation valve during plant cooldown after reactor shutdown 2 H
49 Wolsong-4 2018-01-14 Fire at pressure controller of oxygen bottle in moderator cover gas system 2 M
50 Wolsong-1 2017-11-15 Activation of seismic alarm signal by an the earthquake near Pohang etc eX
51 Wolsong-3 2017-10-18 Manual reactor trip for maintenance of freeze plug of emergency core cooling system isolation valve 1 M
52 Shin-Kori-1 2017-08-31 Death case of a worker during maintenance of circulation water bubble removal equipment etc etc
53 Hanul-5 2017-07-05 Reactor trip by reactor coolant pump trips due to malfunction of a circuit board of plant control system 1 I&C
54 Wolsong-1 2017-05-28 Standby diesel generator startup and reactor trip due to failure of power source transfer during power reduction for overhaul 2 E
55 Kori-4 2017-03-28 Reactor coolant leakage at 1ry chamber drain valve of steam generator 1 M
56 Wolsong-4 2017-03-27 Drop of a fuel bundle during handling of new fuel etc H
Total 23 26 7 9 12 12 5 14 3
Rate(%) 41.1 46.4 12.5 16.1 21.4 21.4 8.9 25.0 5.4