INES Levels
INES N/A
INES 0
INES 1
INES 2
INES 3
INES 4
INES 5
INES 6
INES 7

INES 1: Anomaly

Impact on Defence-in-Depth
  • Overexposure of a member of the public in excess of statutory ­annual limits.
  • Minor problems with safety components with significant defence-in-depth remaining.
  • Low activity lost or stolen radioactive source, device or transport package.
(Arrangements for reporting minor events to the public differ from country to country. Also, it is difficult to ensure precise consistency in rating events between INES Level-1 and Below scale/Level-0)
▸ Legenda & explanation
date title location 
1994-04-18SCRAM DUE TO THE LEVEL DROP IN TANKS OF EMERGENCY REACTOR COOLING SYSTEMUkraineCHERNOBYL-3
1994-05-18RUPTURE OF PRESTRESSED CABLE WIRES CONTAINMENTS DOME PARTUkraineSOUTH UKRAINE-1
1995-05-28ROUTINE SURVEILLANCE REVEALS: STEAM GENERATOR SAFETY VALVES OPEN AT HIGHER PRESSURE THAN SPECIFIED AT THE RINGHALS 2. 3 AND 4 PWRSSwedenRINGHALS-2
2022-04-21Rod type source of a level gauge became openHungaryNitronénművek Co Ltd.
1991-09-10REVEAL OF INADVERTENTLY CLOSED MANUAL SERVICE VALVES AT VERIFICATION TESTS OF THE SCRAM SYSTEM BEFORE PREPARATIONS TO RESTARTSwedenFORSMARK-2
1994-01-03RENDERING AN EMERGENCY FEEDWATER PUMP AND AN AUXILIARY EMERGENCY FEEDWATER PUMP AVAILABLE FOR A SHORT TIME WITHOUT ADHERANCE TO THE REQUIREMENTS OF THE TECSPECSHungaryPAKS-4
1996-08-05Release of iodine-131 from 131 production plant of nuclear chemistry division Pakistan Institute of Nuclear Science and TechnologyPakistanPINSTEC
1992-05-13RECIRCULATION TRANSIENT WITH A SUDDEN INCREASE IN POWER OVER 100%MexicoLAGUNA VERDE-1
1998-06-24Reactor trip and natural circulation cooldown due to loss of offsite powerUnited States of AmericaDAVIS BESSE-1
1990-09-04REACTOR START UP WITH DEGRADED REACTOR SHUT DOWN SYSTEMSSwitzerlandLEIBSTADT
1992-12-13REACTOR SHUTDOWN BY THE ACTUATION OF THE EMERGENCY PROTECTION SYSTEM FOLLOWED BY NON-COMPLIANCE WITH THE SAFE OPERATING LIMITS ON STEAM GENERATOR COOLDOWN RATEUkraineROVNO-2
1992-05-09REACTOR SHUTDOWN BY TECHNICAL SPECIFICATIONS APPLICATION (UNUSUAL EVENT)MexicoLAGUNA VERDE-1
1996-01-31Reactor scram followed by the actuation of safety valve in the reactor primary circuitRussian FederationNIIAR Inst., Dimitrovgrad
2007-03-06Reactor Scram due to Inadvertent Opening of Multiple SRV’sSwitzerlandLEIBSTADT
1994-03-16REACTOR SCRAM CAUSED BY THE CABLE FIRE UNDER THE TURBINE HALL PREMISESUkraineKHMELNITSKI-1
1991-07-18REACTOR SCRAM AND COOLDOWN BECAUSE OF LEAKAGE IN A PRIMARY CIRCUIT MEASURING SYSTEMHungaryPAKS-1
2003-01-20Reactor Protection Actuation and safety injectionBulgariaKOZLODUY-3
1990-12-21REACTOR COOLANT LEAKAGE DUE TO FAILURE OF SEALING OF MAIN REACTOR FLANGEBulgariaKOZLODUY-2
1990-07-07REACTOR COOLANT LEAK ON REACTOR TEMPERATURE DETECTORSpainVANDELLOS-2
1994-12-11REACTOR AUTOMATIC SHUTDOWN BY SIGNAL OF NUCLEAR INSTRUMENTATION SYSTEMSYSTEMJapanONAGAWA-1
2003-07-01Radiological incident occurred in the fuel element auxiliary pool, involving Co-60 withdrawn from an adjuster unitArgentinaEMBALSE
2000-12-28Radioactive source found in scrap recycling facility in GreeceGreeceHELLENIC STEEL PRODUCTION CO.
2007-02-12Radioactive source (Cs-137) found at a scrap yardNetherlandsJewometaal, Rotterdam-Botlek
2004-11-29Radioactive orphan source of Eu-152,154Croatianon-nuclear
2012-10-12Radioactive gauge, lost and foundGreeceAluminium SA
1993-10-07RADIOACTIVE CONTAMINATION OF THE UNIT ROOMS DUE TO REACTOR COOLANT LEAK IN THE AUXILIARY SYSTEMRussian FederationBELOYARSKY-3(BN-600)
1996-04-24Radioactive contamination at the Unit N3UkraineCHERNOBYL-3
2002-01-18Radioactice source found in a scrap recycling facility in GreeceGreeceHalivourgiki / Aspropirgos
2008-08-28Radiation Worker Skin OverexposureNetherlandsCovidien, Mallinckrodt Medical B.V., Petten
2014-02-12Radiation Leakage from Brachytherapy MachinePakistanDr. Ziauddin Hospital, Karachi