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 : 217 / 295Document ID.No.UKEPR-0002-162 Issue 04SUB-SECTION 16.2.2.5 - TABLE 12LOOP sequence of events for in-vessel phase(Data inferred from the information given in section 2.1)KEY EVENTSTIMEReactor Coolant Pump run down 0 h 00 min 0 sReactor scram 0 h 00 min 0 sAffected SG dry 2 h 06 min 7560 sQuench tank disk rupture 2 h 12 min 7920 sCore uncovery 2 h 55 min 10500 sAccumulator injection start 3 h 19 min 11940 sAccumulator depletion 3 h 31 min 12660 sSA dedicated PZR valve opening 3 h 10 min 11400 sOnset of oxidation 4 h 33 min 16380 sStart of core melting 4 h 41 min 16860 sStart of core relocation to lowerhead7 h 23 min 26580 sRPV failure 8 h 26 min 30360 s
SUB-CHAPTER : 16.2PRE-CONSTRUCTION SAFETY REPORTCHAPTER 16: RISK REDUCTION AND SEVEREACCIDENT ANALYSESPAGE : 218 / 295Document ID.No.UKEPR-0002-162 Issue 04SUB-SECTION 16.2.2.5 - TABLE 13LOOP sequence of events for ex-vessel phase [Ref]CONCERNEDLOCATIONKEY EVENTSTIMEReactor pitCore catcherStart of MCCI in the reactor pit afterinitial vessel failureEnd of MCCI in reactor pitArrival of the melt in the corecatcherInitiation of flooding of bottomcooling systemStart of core melt quenching in thecore catcher (time delay 300 s) withsteam production of 100 kg/sEnd of MCCI in core catcher(sacrificial concrete is consumed)End of steam production due tocore melt quenchingStart of filling of the core catcherwith sub-cooled water from theIRWSTEnd of fill–up phase (waterinventory of 450 x 10 3 kg reached)Start of boiling and steamproduction due to decay heat8 h 26 min 30360 s10 h 40 min 38400 s10 h 45 min 38700 s12 h 18 min 44300 s11 h 08 min 40100 s12 h 30 min 45000 s15 h 16 min 55000 s
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16.2 - Severe Accident Analysis (RRC-B) - EDF Hinkley Point

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