16.2 - Severe Accident Analysis (RRC-B) - EDF Hinkley Point

SUB-CHAPTER : 16.2PRE-CONSTRUCTION SAFETY REPORTCHAPTER 16: RISK REDUCTION AND SEVEREACCIDENT ANALYSESPAGE : 81 / 295Document ID.No.UKEPR-0002-162 Issue 04SECTION 16.2.2.2 - TABLE 1TLOFW scenario, delayed RCP [RCS] depressurisation [Ref]Onset of core melt without any PDS line openingOnset of core relocation into lower head without any PDS line openingPeriod after the 650°C signal to actuate PDS valves to be below 20 bar attime of vessel breach (without safety injection)1h 40 min3h 29 min2hSECTION 16.2.2.2 - TABLE 2LOOP with unavailability 6 DG, vessel failure pressure for late in-vessel reflooding(4 MHSI + 4 LHSI) time events [Ref]LOOP with 6 DG unavailableLate in-vessel reflooding (4 MHSI + 4 LHSI)Time of eventsOnset of in-vesselrefloodingNo reflooding Relocation Relocation +30 minRelocation +60 minRelocation+90 minVessel failurepressure2 bar 18 bar 18 bar 18 bar 20 bar