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 : 215 / 295Document ID.No.UKEPR-0002-162 Issue 04SUB-SECTION 16.2.2.5 - TABLE 10SB(LOCA) sequence of events for ex-vessel phase [Ref]LOCATION KEY EVENTS TIMEReactor 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·x10 3 kg reached)Start of boiling and steamproduction due to decay heat46 h 51 min 168700 s50 h 03 min 180200 s50 h 08 min 180500 s52 h 23 min 188600 s50 h 30 min 181800 s51 h 23 min 185000 s56 h 06 min 202000 s
SUB-CHAPTER : 16.2PRE-CONSTRUCTION SAFETY REPORTCHAPTER 16: RISK REDUCTION AND SEVEREACCIDENT ANALYSESPAGE : 216 / 295Document ID.No.UKEPR-0002-162 Issue 04SUB-SECTION 16.2.2.5 - TABLE 11SB(LOCA) pressure of selected times(Data derived from the analysis results presented inSub-section 16.2.2.5 - Figures 2, 7 and 12)Time[s]Pressure withEVU [CHRS](2 trains)[bar]Break pressure peak 1800 1.45Maximum pressureuntil end of in-vesselphase< 168700 1.5Quench peak(flooding of core meltin core catcher)Pressure at start ofEVU [CHRS]operationPressure decreaseuntil boiling starts inthe core catcherPressure after3.5 daysPressure increaserate at 3.5 days181800 3.6188400 2.2202000 1.1300000 1.4300000 -0.002 [bar/h]
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16.2 - Severe Accident Analysis (RRC-B) - EDF Hinkley Point

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