Investor Presentaiton

US-ABWR Containment Overpressure Protection ■Containment Overpressure Protection System -Venting provided from suppression pool -Passive System does not require operator action -System valves are normally open and fail open -System can be isolated post disk rupture 1st if desired Rupture disks -1st rupture disk: part of the primary containment boundary setpoint pressure = 2 Pd -2nd rupture disk: PLANT STACK OUTER 2nd rupture AC 3 RUPTURE disk rupture disk D&K TO REACTOR BLDG HVAC EXHAUST HVAC AC 2 SGTS AC 2 * P SGTS P INNER RUPTURE | DISK 2 BLEED LINE VALVE P F P DIVV. DRYWELL S/P SP installed to maintain inerted condition in COPS pipe CONTAINMENT OVERPRESSURE PROTECTION SYSTEM System valves TOSHIBA Copyright © 2012 Toshiba Corporation. All rights reserved. Leading Innovation >>> 25 DIV. IV

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