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 : 211 / 295Document ID.No.UKEPR-0002-162 Issue 04SUB-SECTION 16.2.2.5 - TABLE 6LB(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 x 10 3 kg reached)Start of boiling and steamproduction due to decay heat2 h 58 min 10680 s4 h 51 min 40 s 17500 s4 h 56 min 40 s 17800 s6 h 16 min 40 s 22600 s5 h 21 min 40 s 19300 s6 h 56 min 40 s 25000 s8 h 53 min 20 s 33000 s
SUB-CHAPTER : 16.2PRE-CONSTRUCTION SAFETY REPORTCHAPTER 16: RISK REDUCTION AND SEVEREACCIDENT ANALYSESPAGE : 212 / 295Document ID.No.UKEPR-0002-162 Issue 04SUB-SECTION 16.2.2.5 - TABLE 7LB(LOCA) pressure of selected times(Data derived from the analysis results presented inSub-section 16.2.2.5 – Figures 2, 7 and 12)Blowdown pressurepeakPressure at end ofin-vessel phaseQuench peak(flooding of coremelt in corecatcher)Pressure decreaseuntil boiling starts inthe core catcherPressure at start ofEVU [CHRS]operationPressure after22.2 hoursPressure increaserate at 22.2 hoursTime[s]Pressure withEVU [CHRS](2 trains)[bar]Pressure withoutEVU [CHRS][bar]100 3.5 3.510680 2.2 2.219300 4.8 4.833000 2.6 2.644700 3.4 3.480000 2.0 4.780000 -0.02 [bar/h] 0.12 [bar/h]
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16.2 - Severe Accident Analysis (RRC-B) - EDF Hinkley Point

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