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Table 5: Treated process parameters and relation to PIRT.

Process parameter Influenced phenomenon (PIRT subset) Fuel state (burnup and power peaking) Stored energy Core power Stored energy Power peaking, axial shape Stored energy Loop flow rate Flow split, DNB Core inlet temperature DNB Upper head temperature Flow reversal, stagnation Pressurizer pressure, level Early quench, critical flow in surge line Accumulator pressure, temperature, level Accumulator discharge, condensation, noncondensable gases Containment volume, heat transfer, sprays Backpressure, critical flow Steam generator feedwater temperature Core heat transfer Offsite power and diesel start delay Core heat transfer via pumped ECC