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 : 51 / 295Document ID.No.UKEPR-0002-162 Issue 04SECTION 16.2.2.1 - TABLE 6Decay heat – Assumptions for severe accident studiesTime after Shutdown Decay heat assumption used for severe accidentanalyses (% of nominal power) [Ref]0.1 s 6.0081 s 5.6125 s 4.82810 s 4.39150 s 3.402100 s 2.9961800 s 1.6121 h 1.3075 h 0.84610 h 0.71824 h 0.57536 h 0.514111 h 0.3598 d 0.29211 d 0.25813 d 0.24215 d 0.22920 d 0.20932 d 0.170
SUB-CHAPTER : 16.2PRE-CONSTRUCTION SAFETY REPORTCHAPTER 16: RISK REDUCTION AND SEVEREACCIDENT ANALYSESPAGE : 52 / 295Document ID.No.UKEPR-0002-162 Issue 04SECTION 16.2.2.1 - TABLE 7Event chronology for core melt scenarios without in-vessel reflooding (MAAP 4 Code)- SG partial and fast secondary cooldown [Ref]One PDS lineopeningCore uncoveryAccumulatordepletionCore melt onsetStart of corerelocation intolower headFirst vesselfailureLOCAcold leg 5 cm(20 cm²)24h19min20h37min35 min25h28h31min30h07minLOCAcold leg 7.5cm(46 cm²)LOCAhot leg 5 cm(20 cm²)Full power, 1 SG feed9h45min12h52min8h12min9h30min35 min3h17min9h58min13h03min12h35min15h55min13h54min18h37minLOCAhot leg 7.5cm(46 cm²)4h58min3h36min35 min5h10min7h40min8h41minLOCAcold leg 5 cm(20 cm²)Full power, 4SG fed40h18min38h46min33 min40h21min43h23min46h18minLOCAhot leg 7.5 cmpressuriserbreakFull power, 1SG fed14h27min11h56min34min14h39min17h33min17h45minSGTR onedouble endedtube48h45min47h59min4h47min49h36min56h56min58h31min
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16.2 - Severe Accident Analysis (RRC-B) - EDF Hinkley Point

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