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

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SUB-CHAPTER : 16.2PRE-CONSTRUCTION SAFETY REPORTCHAPTER 16: RISK REDUCTION AND SEVEREACCIDENT ANALYSESPAGE : 53 / 295Document ID.No.UKEPR-0002-162 Issue 04SECTION 16.2.2.1 - TABLE 8Event chronology for core melt scenarios without in-vessel reflooding (MAAP 4 Code)- SG partial cooldown only [Ref]One PDS lineopeningCore uncoveryAccumulatordepletionCore melt onsetStart of corerelocation intolower headFirst vesselfailureLOCAcold leg 3.8cm(11.4 cm²)3h33min3h01min3h40min4h50min6h58min8h19minLOCAhot leg 3.8cm(11.4 cm²)3h02min2h19min3h10min4h12min6h17min6h58minLOCAcold leg 5cm(20 cm²)LOCAhot leg 5 cm(20 cm²)LOCAhot leg 7.5cm(46 cm²)Full power, 4 SG fed2h01min1h43min47min1h41min1h23min35min2h07min1h50min53min3h09min2h44min1h38min4h52min4h43min3h14min6h30min4h58min4h26minLOCAcold leg 7.5cm(46 cm²)57 min44min1h02min1h52min4h16min5h05minLOCA surgeline 35.6 cm(993 cm²)23 min11min17min28min1h54min2h45min
SUB-CHAPTER : 16.2PRE-CONSTRUCTION SAFETY REPORTCHAPTER 16: RISK REDUCTION AND SEVEREACCIDENT ANALYSESPAGE : 54 / 295Document ID.No.UKEPR-0002-162 Issue 04SECTION 16.2.2.1 - TABLE 9Event chronology for core melt scenarios without in-vessel reflooding (MAAP 4 Code)- Scenarios without RCS break and with SG dry-out [Ref]SG dryoutOne PDS line openingCore uncoveryAccumulator depletionMHSI injection [3h05mn-6h]LHSI injection [3h14mn-6h]Core melt onsetStart of core relocation into lowerheadFirst vessel failureLOOP 24 HFULLPOWER2h13min3h20min3h3h39min4h49min6h36min7h54minLOOP 24 HNORMALFEED ANDBLEEDDURING 3 H2h13min7h28min3h6 h7h35min9h31min11h21minLOOPSHUTDOWNCONDITIONCA (6H AFTERSCRAM)7h10h12min9h43min-10h33min13h04min14h34minLOOPSHUTDOWNCONDITIONSCb (23H AFTERSCRAM)9h37min12h34min11h51min-13h03min10h16min18h19minLOOPSHUTDOWNCONDITIONSCb (35H AFTERSCRAM)1h18min2h15min7h09min8h45min
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16.2 - Severe Accident Analysis (RRC-B) - EDF Hinkley Point

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