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NRC Recommendation and KEPCO’s Improvements

The U.S. based Nuclear Regulatory Committee (NRC) published results of the review which was conducted for 90 days and 12 subsequent recommendations as part of follow-up efforts after the Fukushima nuclear accident.

Establishment of Regulations

Establishment of Regulations
NRC Recommendation KEPCO’s Improvements
The Task Force recommends establishing a logical, systematic, and coherent regulatory framework for adequate protection that appropriately balances defense-in-depth and risk considerations.
Improvements following regulations

Protective Measures

Protective Measures
NRC Recommendation KEPCO’s Improvements
The Task Force recommends that the NRC require licensees to reevaluate and upgrade as necessary the design-basis seismic and flooding protection of Safe Shutdown Conditions (SSC)s for each operating reactor.
  • Inspection and study on the extreme seismic events
  • Inspection and study on design-basis sea level
  • Improvements in fire fighting plan and stronger cooperative system
The Task Force recommends, as part of the longer term review, that the NRC evaluate potential enhancements to the capability to prevent or mitigate seismically induced fires and floods.

Improvement of Neutralizing Measures

Improvement of Neutralizing Measures
NRC Recommendation KEPCO’s Improvements
The Task Force recommends that the NRC strengthen Station Black Out (SBO) mitigation capability at all operating and new reactors for design-basis and beyond-design-basis external events.
  • Movable generator and storage battery secured
  • Alternative emergency generator design basis improved
  • External injection flow path for reactor emergency cooling water installed
The Task Force recommends requiring reliable hardened vent designs in BWR facilities with Mark Ⅰ and Mark II containments.
  • BWR related improvements
  • Containment vent/depressurization facility installed
The Task Force recommends, as part of the longer term review, that the NRC identify insights about hydrogen control and mitigation inside containment or in other buildings as additional information is revealed through further study of the Fukushima Dai-ichi accident.
  • Passive hydrogen removal facility installed
The Task Force recommends enhancing spent fuel pool makeup capability and instrumentation for the spent fuel pool.
  • Countermeasures are in place in the event that spent fuel pool cooling function is lost
  • Preparing measures to secure required information when long-term power is lost
The Task Force recommends strengthening and integrating onsite emergency response capabilities such as Emergency Operation Procedures (EOP)s, Severe Accident Management Guidelines (SAMG)s and Extensive Damage Mitigation Guidelines (EDMG)s.
  • Strengthening education and training on severe accidents
  • Severe Accident Management Manual revised to strengthen effectiveness of accident management strategy

Improvements of Capability to Deal with Emergencies

Improvements of Capability to Deal with Emergencies
NRC Recommendation KEPCO’s Improvements
The Task Force recommends that the NRC require that facility emergency plans address prolonged SBO and multiunit events.
  • Upgraded system for emergency response and medical preparedness for radiation-related emergency
The Task Force recommends, as part of the longer term review, that the NRC should pursue additional Emergency Power (EP) topics related to multiunit events and prolonged SBO.
The Task Force recommends, as part of the longer term review, that the NRC should pursue EP topics related to decisionmaking, radiation monitoring, and public education.

Improvement of NRC Efficiency

Improvement of NRC Efficiency
NRC Recommendation KEPCO’s Improvements
The Task Force recommends that the NRC strengthen regulatory oversight of licensee safety performance (i.e. the Reactor Oversight Process (ROP)) by focusing more attention on defense-in-depth requirements consistent with the recommended defense-in-depth framework.
  • Improvements following regulations