Containment Depressurization Capabilities of Filtered Venting System in 1000 MWe PWR with Large Dry Containment

Table 1

Safety improvement action items in Korea after Fukushima accidents.

Categories	Major action item
(1) Design of structures and equipment against earthquakes	(i) Installing an automatic seismic trip system; (ii) Improving seismic capability of the safe shutdown systems and MCR; (iii) Reassessment of maximum potential earthquakes for nuclear plant sites
(2) Design of structures and equipment against coastal flooding	(i) Extension of the height of sea wall; (ii) Installation of waterproof gates and discharge pump; (iii) Investigation of the design basis sea water level of nuclear plant sites
(3) Integrity of electric power, cooling, and fire protection system upon inundation	(i) Securing availability of portable power generator vehicles and batteries; (ii) Upgrading design basis of alternative AC diesel generators; (iii) Ensuring countermeasure against loss of spent fuel pool cooling function; (iv) Improving fire protection facilities and fire protection plan
(4) Countermeasures against severe accidents	(i) Installation of passive hydrogen removal equipment; (ii) Installation of filtered vent system or backup spray system; (iii) Revision of severe accident management guidelines to enhance effectiveness; (iv) Installation of reactor injection flow path from external cooling source
(5) Emergency response	(i) Amending emergency plans to address concurrent events at multiple units; (ii) Development of extensive damage mitigation guidelines