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 
1995-01-29HUMAN ERROR INITATED REACTOR TRIPUkraineCHERNOBYL-3
1994-10-17THROUGH WALL CRACK OF THE UPPER PART OF THE FUEL CHANEL TRACT NO. 41-13UkraineCHERNOBYL-3
2015-05-15Eu-152 lightning rods found in metal scrapThe Former Yugoslav Republic of MacedoniaPAVOR DOOEL SKOPJE, Scrap Metal Yard Veles
2015-05-20Orphan source foundThe Former Yugoslav Republic of MacedoniaAS Bosfor DOOEL Skopje-Metal Scrap Yard
2018-12-18Missing Tc-99m GeneratorSwitzerlandSion, nuclear medicine institute
2007-03-06Reactor Scram due to Inadvertent Opening of Multiple SRV’sSwitzerlandLEIBSTADT
1990-09-04REACTOR START UP WITH DEGRADED REACTOR SHUT DOWN SYSTEMSSwitzerlandLEIBSTADT
2004-05-28Violation of heat-up rate during restart of reactorSwitzerlandLEIBSTADT
2004-05-28Violation of Containment ventilation operation modeSwitzerlandLEIBSTADT
1996-08-13Water leak into a hot cell at the Studsvik research establishmentSwedenStudsvik Nuclear AB
1995-11-15DEVIATION FROM TECHNICAL SPECIFICATIONSSwedenRINGHALS-4
1991-09-18ONE FUEL ASSEMBLY TILTED DURING REFUELLINGSwedenRINGHALS-4
1995-02-12NOT FULLY INSERTED CONTROL RODSSwedenRINGHALS-3
1991-05-28FUEL ASSEMBLY TILTED OVER DURING CORE LOADINGSwedenRINGHALS-2
1995-05-28ROUTINE SURVEILLANCE REVEALS: STEAM GENERATOR SAFETY VALVES OPEN AT HIGHER PRESSURE THAN SPECIFIED AT THE RINGHALS 2. 3 AND 4 PWRSSwedenRINGHALS-2
1994-04-18INCORRECT SAFEGUARD REPORTINGSwedenRINGHALS-2
1997-08-17Automatic protection system disconnected during non nuclear heat up after refuellingSwedenRINGHALS-2
1997-07-01Two out of four diesel generators unavailable due to loose connection to the voltage regulatorSwedenRINGHALS-2
1992-12-08INCORRECT CONNECTION OF CABLES TO RELAYS IN SAFETY SYSTEMSSwedenRINGHALS-2
2001-06-20Incorrect calculation of an algorithm in overload protection devices for local power distribution at Ringhals 2 NPP.SwedenRINGHALS-2
1991-08-14DEVIATION FROM OPERATING INSTRUCTIONSSwedenOSKARSHAMN-2
1995-08-26DESIGN DEFICIENCIES IN DIESEL GENERATORS FOUND DURING EXTENDED TESTINGSwedenOSKARSHAMN-1
1996-01-21A PART OF THE RESIDUAL HEAT REMOVAL SYSTEM - THE AUXILIARY CONDENSER - TEMPORARILY NOT AVAILABLESwedenOSKARSHAMN-1
1995-01-01DESIGN DEFICIENCIES IDENTIFIED IN SEPARATION OF ELECTRICAL SYSTEM, AVOIDANCE OF COMMON CAUSE FAILURES IN THE REACTOR PROTECTION SYSTEM AND OVERPRESSURE RELEASE IN THE AUX BUILD.SwedenOSKARSHAMN-1
1996-03-04FAILURE OF A CONTAINMENT ISOLATION VALVE AT A PERIODICAL TESTSwedenOSKARSHAMN-1
1993-02-24CRACKS IN PIPEBENDS (ELBOWS) IN THE RESIDUAL HEAT REMOVAL SYSTEMSwedenOSKARSHAMN-1
1990-10-01FAULTY WELD DETECTED ON PRIMARY CIRCUITSwedenOSKARSHAMN-1
1994-06-15UNINTENTIONAL SLOW INSERTION OF ALL CONTROL RODSSwedenFORSMARK-3
2013-05-30EDG failed to start after unintentional loss of two phases on 400 kV incoming offsite supplySwedenFORSMARK-3
2006-07-25INES-rating due to earlier event at Forsmark 1 - Two emergency DG did not start when the unit was disconnected from the ordinary off-site gridSwedenFORSMARK-2