Belgian Stress Test Nuclear Power Plants (BEST)
2013-08-26 TM IAEA: Belgian Stress Tests
Stress Test Specifications Technical scope Initiating events Earthquake Flooding Other extreme natural events (extreme weather, bush or forest fire) Terrorist attacks (= aircraft crash) Other man made events» Toxic and explosive gases and blast wave» External attack on computer based controls and systems Loss of safety functions: Loss of electrical power and/or loss of the ultimate heat sink Severe accident management (core damage, containment damage, ) Red = Difference between European and Belgian stress test specifications Green = Accident scenario as seen at Fukushima Daiichi NPP
Time line Belgian stress tests NPPs July 4th, 2011 Belgian Stress Test specifications October 31st, 2011 Electrabel reports submitted to FANC 2012 ENSREG Peer Review Visit Licensee action plan consolidated (06/2012) August 15 th, 2011 Electrabel progress report submitted at FANC September 15th, 2011 Progress report of the Federal Agency (FANC) December 31st, 2011 National report with final assessment by the FANC Bel V Additional demands & requirements
Nuclear power plants (BEST) General Conclusions Belgian plants are robust in design and have particular strengths : Metallic liner Pre-stressed concrete Annulus space Reinforced concrete 5
Nuclear power plants (BEST) Main actions: Review Level Earthquake
Nuclear power plants (BEST) Main actions: Peripheral Flood Wall
Nuclear power plants (BEST) Main actions: dyke reinforcements
Nuclear power plants (BEST) Main actions: New Deep ground water well External events Loss of safety functions Severe accidents Earthquake: Improvement of seismic resistance of several SSC Perform state-of-the-art seismic-hazard reassessment Flooding: Perhiperial protection, reinforcement Weather: Reassessment with longer return periods Explosive gases: Assess need for detection Cyber attack: Perform independent external audit External electrical network: Improve reliability and availability Total loss of electrical power: assess impact on Steam-generator cooling Containment isolation Spent-fuel pools Loss of ultimate heat sink: Set up a water consumption strategy Check / improve availability (eg. new deep ground water well) Assess the risk related to steam explosions when corium falls into a flooded reactor pit Assess the need for new and/or qualified instrumentation for severe-accident management Assess means to control ph inside the containment Filtered containment venting Emergency plan: improve organization, procedures, training (multi-unit, long duration) Rooms for emergency-plan management: guarantee long-term habitability, new OPS center Means to cope with external events: increase capability and / or availability Non Conventional Means
Nuclear power plants (BEST) Main actions External events Loss of safety functions Severe accidents Earthquake: Improvement of seismic resistance of several SSC Perform state-of-the-art seismic-hazard reassessment Flooding: Perhiperial protection, reinforcement Weather: Reassessment with longer return periods Explosive gases: Assess need for detection Cyber attack: Perform independent external audit External electrical network: Improve reliability and availability Total loss of electrical power: assess impact on Steam-generator cooling Containment isolation Spent-fuel pools Loss of ultimate heat sink: Set up a water consumption strategy Check / improve availability (eg. new deep ground water well) Assess the risk related to steam explosions when corium falls into a flooded reactor pit Assess the need for new and/or qualified instrumentation for severe-accident management Assess means to control ph inside the containment Filtered containment venting Emergency plan: improve organization, procedures, training (multi-unit, long duration) Rooms for emergency-plan management: guarantee long-term habitability, new OPS center Means to cope with external events: increase capability and / or availability Non Conventional Means
350 actions identified BEST Action Plan Follow up Very ambitious target dates (2013- ) Action plan follow up by FANC & Bel V Regular update by licensee of action plan progress Periodic progress meetings with FANC & Bel V Steering committee to discuss certain issues with high importance: f.e. seismic level for Ultimate Means on-site inspections to check implementation
BEST Action Plan Inspections 2013 Inspection program FANC includes stress test inspections for Doel & Tihange Follow-up quick wins (non conventional means, ): condition of equipment, training, procedures, maintenance, testing, Unannounced test of deployment of non-conventional means (for example Simulation of total SBO on whole site ) Joint inspections FANC & Bel V
Belgian Stress Test Non-Nuclear Power Plants (BESTA)
Stress test for other nuclear installations in Belgium As requested by Belgian Parliament Scope: Class I facilities in operation SCK CEN, Belgoprocess, FBFC International, IRMM, IRE, WAB Doel Large variety in installations & risks Stress Tests specifications (04/07/2011) have similar structure as specifications for NPPs Timing is different