3 Steps Approach :

KHNP’s Implementation of Post Fukushima Actions

ST(Sung-Tae) Yang

General Manager Corporate Safety Department

KHNP

2

Seoul

In Operation

Under Construction

Planned

(As of Jan 2016)

Status of Nuclear Power Plants

3 Steps Approach

Post Fukushima Safety Review Stress Test New Accident Management Plan

* Securing Coping Capability to Extreme External Hazards

* Reviewer : Regulator-University- Institute Collaboration

* 6 Area * Short Period Evaluation (’11.3.21 ~ 4.30)

* 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

* 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

1 2 3

Prompt Remedy to SSC

Applying International Standard Review Method

Establishing Total Accident Response System

Composed of 14 member countries and 20 regulatory experts Reviewed the Korean regulatory system (July 10- 22, 2011)

’11.3.16 ~ ’11.3.18 Composed of 44 internal & external experts Integrity of 4 critical areas of the plant

’11.3.21 ~ ’11.5.3 Composed of 73 external experts and regulatory body Inspectors for 21 nuclear units in operation Overall plant status Check

* IRRS : Integrated Regulatory Review Service

Safety Review

Earthquakes and Tsunamis

Electrical Power and

Cooling Ability

Severe Accidents

Emergency Response

* ASTS : Automatic Seismic Trip System, SAMG : Severe Accident Management Guideline, SFP : Spent Fuel Pond

Additional radiation protective

equipment for the sake of residents 11

ASTS

height extension of NPP sea wall 20

Passive hydrogen removal

equipment or ventilation facilities in

the CV

Reinforcement of the SAMGs 10

Mobile generator vehicles Injection loop for SFP emergency cooling water 15

Action Items

Major Improvement

Sea Wall Water

proof

door

Diesel driven

pump

PAR

CFVS

reactor emergency cooling

SFP Emergency cooling

Mobile

generator

REACTOR

Building

REACTOR

Steam

Generator

EDG

SEA

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

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 (2013.04.30)

Operator Self-Assessment

① Adequacy Reviews (including plant walk-down)

② Detailed Reviews (regulator + private experts)

NSSC

Reviews

Step 1 Step 2 Step 3

‘13.5.1

‘13.9.1

Step 2 Step 1 Step 3

Step 1 Step 2

11

‘13.7.12 ‘14.12.12 ‘15.2.27

‘13.12.20 In progress

WOLSONG-1

KORI-1

License Renewal

(Area 1) Safety of SSCs against Earthquakes(EU)

Assessment Area in Stress Test

(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

Natural Hazards Fire

Safety Function

Failure

Severe Accidents

Managements

Emergency Response Operational Performance

-Installation of On-site Emergency Response Facility

- Strengthen of Man-Power and Organization against

Extreme Hazards 6

- Re-ensuring the Site Stability due to Seismic Event ( ~ 2019)

- Increasing the Resistivity for Seismic Induced Fire (~ 2017)

- Strengthen the Secondary Control Room( ~ 2015) 3

- 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 7

- Installation of 8-hour Seismic Battery(~ 2017) -Securing Essential Function from Multi-unit Accident - Securing Long-term Cooling Capability(2016) 3

Wolson #1 Action Items

Natural Hazards Fire

Safety Function

Failure

Severe Accidents

Managements

Emergency Response Operational Performance

- EP enhancement for SFP Accident

- Supplement the habitability of ERF 8

- Re-review Seismic Performance of SFP Cooling Sys

- Increasing the Resistivity for Seismic Induced Fire 2

- Securing On-site Communication measures between MCR and

Field Operators 1

- Installation of 8-hour Seismic Battery - Securing Essential Function from Multi-unit Accident

• mobile DG for single Rx, etc. - Maintenance of Mobile DG 3

Kori #1 Action Items

Kori #1 is planned to permanently defueling in 2017 for decommissioning

Stress Test

for All Operational Nuclear Power Plants in Korea

1st 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)

2nd 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)

• 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

19

Phase Responding Facility Electric Power Coolant

Phase 1 (0 ~ 8hr) Installed Facilities Battery CST

Phase 2 ( ~ 72hr)

Onsite Portable Facilities

* SAFE-T

Portable DG

① CST ② DWST

③ RST ④ RWF

Phase 3 (72hr~ )

Offsite supplemental Resource

* SAFE-T + Outside support

DG +

(EDG)

① CST ② DWST

③ RST ④ RWF

SAFE-T (30) Accident Strategy

Support (16) Facilities O&M Support (12)

WEC Type (4) OPR1000 (4) CANDU (4)

APR1400 (2) Framatone (2)

Mechanical (4) Electrical (4)

I&C (4)

Thank You!