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

SUB-CHAPTER : 16.2PRE-CONSTRUCTION SAFETY REPORTCHAPTER 16: RISK REDUCTION AND SEVEREACCIDENT ANALYSESPAGE : 46 / 295Document ID.No.UKEPR-0002-162 Issue 04SECTION 16.2.2.1 - TABLE 1MAAP4 data – Assumptions for severe accident studiesOverpressure protection system, depressurisation system [Ref]PORV opening pressures174, 178, 178 barAssumption of total RCP [RCS] severe accident discharge through 250 kg/s at 176 barone PDS-lineSecondary side relief valves opening pressure95.5 barSecondary side safety valves opening pressure104 barPump head table: 1 MHSI pumpHeight (m) Volumetric flow rate (m 3 /s) Mass flow rate (kg/s)800 0 0700 1.417 10 -2 14.16600 2.278 10 -2 22.8400 3.444 10 -2 34.440 5.111 10 -2 51.1Pump head table: 1 LHSI pumpHeight (m) Volumetric flow rate (m 3 /s) Mass flow rate (kg/s)200 0 0160 4.028 10 -2 40.3120 6.611 10 -2 66.160 9.528 10 -2 95.30 1.156 10 -1 115.5Accumulators:– Number(all injecting into downcomer, MAAP 4 assumption): 4– Total volume: 47 m³ for each accumulator– Initial water mass: 31700 kg– Initial pressure: 45 bar