DOE-HDBK-1017/2-93Brittle FractureMINIMUM PRESSURIZATION-TEMPERATURE CURVESIf the limit of the MPT curve is exceeded during critical operation, the usual action is to scramthe reactor, cool down and depressurize the PCS, and conduct an engineering evaluation priorto further plant operation.During hydrostatic testing, minimum pressurization temperature precautions include making surethat desired hydrostatic pressure is consistent with plant temperatures so that excessive stress doesnot occur. Figure 5 shows MPT curves for hydrostatic testing of a PWR PCS. The safeoperating region is to the right of the MPT curves. Other special hydrostatic limits may alsoapply during testing.Figure 5 PCS Temperature vs. Hydrotest PressureRev. 0Page 9MS-04
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