3 Steps Approach : KHNP s Implementation of Post Fukushima Actions. ST(Sung-Tae) Yang. General Manager Corporate Safety Department KHNP

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1 3 Steps Approach : KHNP s Implementation of Post Fukushima Actions ST(Sung-Tae) Yang General Manager Corporate Safety Department KHNP

2 Status of Nuclear Power Plants (As of Jan 2016) In Operation Under Construction Planned Seoul 2

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4 3 Steps Approach Post Fukushima Safety Review Stress Test New Accident Management Plan Prompt Remedy to SSC * Securing Coping Capability to Extreme External Hazards * Reviewer : Regulator-University- Institute Collaboration * 6 Area * Short Period Evaluation ( ~ 4.30) Applying International Standard Review Method * Introducing as one of presidential election pledge * Develop our own guideline by Regulator (WENRA reference) * Reviewer : Vendor (KEPCO E&C) * First Application : License Renewal Plant (Kori-1, Wolsong1), to be continued to all NPP Establishing Total Accident Response System * Systematic Approach for Effective Accident Management with MACST strategy (Similar to US FLEX) * 3 phases accident coping strategy Integration of MACST Facilities, Procedures and Emergency Plan * Mandatory Requirement

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6 Safety Review ~ Composed of 73 external experts and regulatory body Inspectors for 21 nuclear units in operation Overall plant status Check ~ Composed of 44 internal & external experts Integrity of 4 critical areas of the plant Composed of 14 member countries and 20 regulatory experts Reviewed the Korean regulatory system (July 10-22, 2011) * IRRS : Integrated Regulatory Review Service

7 Action Items 11 Additional radiation protective equipment for the sake of residents Emergency Response 10 Passive hydrogen removal equipment or ventilation facilities in the CV Reinforcement of the SAMGs Severe Accidents 15 Mobile generator vehicles Injection loop for SFP emergency cooling water Electrical Power and Cooling Ability 20 ASTS height extension of NPP sea wall Earthquakes and Tsunamis * ASTS : Automatic Seismic Trip System, SAMG : Severe Accident Management Guideline, SFP : Spent Fuel Pond

8 Major Improvement CFVS PAR REACTOR Building reactor emergency cooling Sea Wall Water proof door EDG SFP Emergency cooling Mobile generator Steam Generator SEA Diesel driven pump REACTOR 1 Height extension of the seawall at NPP 2 Installation of waterproof doors 3 Installation of waterproof drain pumps (diesel-driven) 4 Securing mobile generator vehicles 5 Installation of external injection loop for emergency cooling water of reactor 6 Installation of injection loop for SFP 7 Installation of passive hydrogen removal equipment 8 Installation of vent or depressurizing facilities in the CV

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10 Stress Tests Conducted in Korea Areas Guideline 1Earthquake 2Tsunami 3Loss of Safety Functions(SBO+LUHS) 4Severe accident Management 5Emergency response Stress Test Specifications of NSSC ( ) Step 1 Step 2 Step 3 Operator Self-Assessment 1 Adequacy Reviews (including plant walk-down) 2 Detailed Reviews (regulator + private experts) NSSC Reviews WOLSONG-1 KORI-1 Step 1 Step 2 Step In progress Step 1 Step 2 License Renewal 11

11 Assessment Area in Stress Test (Area 1) Safety of SSCs against Earthquakes(EU) (Area 2) Safety of SSCs against Tsunami, Storm surge and other natural disasters(eu) (Area 3) Plant Response to loss of electrical power and/or loss of the ultimate heat sink(eu) (Area 4) Severe accident management(eu) (Area 5) Emergency preparedness and response (Common) Assessment of operational aspects 12

12 Wolson #1 Action Items 6 -Installation of On-site Emergency Response Facility - Strengthen of Man-Power and Organization against Extreme Hazards Emergency Response Operational Performance Increasing SAMG Effectiveness from Steam Explosion, etc. -Feasibility Study for Dual Operation of PAR and Igniter Increasing Operability of CFVS, e.g Open Pressure Assessment Severe Accidents Managements Installation of 8-hour Seismic Battery(~ 2017) -Securing Essential Function from Multi-unit Accident Securing Long-term Cooling Capability(2016) Safety Function Failure 3 - Re-ensuring the Site Stability due to Seismic Event ( ~ 2019) - Increasing the Resistivity for Seismic Induced Fire (~ 2017) - Strengthen the Secondary Control Room( ~ 2015) Natural Hazards Fire

13 Kori #1 Action Items Kori #1 is planned to permanently defueling in 2017 for decommissioning 8 - EP enhancement for SFP Accident - Supplement the habitability of ERF Emergency Response Operational Performance 1 Field - Securing On-site Communication measures between MCR and Operators Severe Accidents Managements - Installation of 8-hour Seismic Battery 3 - Securing Essential Function from Multi-unit Accident mobile DG for single Rx, etc. - Maintenance of Mobile DG Safety Function Failure 2 - Re-review Seismic Performance of SFP Cooling Sys - Increasing the Resistivity for Seismic Induced Fire Natural Hazards Fire

14 Stress Test for All Operational Nuclear Power Plants in Korea 1 st Step : Select representative-type reactors, Sequential Evaluation Divided into 4 Reactor Type for a total of 24 nuclear plants under operation Westinghouse 2-loop, PHWR, Westinghouse 3-loop, Framatom, KSNP(Korean Standard Nuclear Power Plant) 2 nd Step : Applying the evaluation result Applying the evaluation result to the other nuclear power plants, taking into account the coverage Stress tests carried out once while operational period (for domestic operating power plants 24 unit)

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16 Nuclear law revision (Jun 2016) all operating NPPs should submit accident management plans Target Plants All operating NPPs and under construction NPPs Schedule : Jan 2017 ~ Jun 2019 Contents of Accident Management Plan - AMP Strategies - Accident Management Implementation Structure - Accident Management Capability Evaluation - Emergency Operating Procedure Guideline - Extreme Disaster Mitigation Guideline - Severe Accident Mitigation Guideline - Accident Management Education and Training Plan

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18 Phase Phase 1 (0 ~ 8hr) Phase 2 ( ~ 72hr) Phase 3 (72hr~ ) Responding Facility Electric Power Coolant Installed Facilities Battery CST Onsite Portable Facilities * SAFE-T Offsite supplemental Resource * SAFE-T + Outside support Portable DG DG + (EDG) 1 CST 2 DWST 3 RST 4 RWF 1 CST 2 DWST 3 RST 4 RWF 19

19 SAFE-T (30) Accident Strategy Support (16) WEC Type (4) OPR1000 (4) CANDU (4) APR1400 (2) Framatone (2) Facilities O&M Support (12) Mechanical (4) Electrical (4) I&C (4)

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24 Thank You!