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Figure 5 PCS Temperature vs. Hydrotest Pressure | Up
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HEATUP AND COOLDOWN RATE LIMITS |
DOE-HDBK-1017/2-93
MINIMUM PRESSURIZATION-TEMPERATURE CURVES
Brittle Fracture
Summary
The important information in this chapter is summarized below.
Minimum Pressurization-Temperature Curves Summary
MPT curves are based on reactor vessel and head stress limitations, and the need
to prevent reactor vessel and head brittle fracture.
MPT curve safe operating region is to the right of the curve.
MPT curve will shift to the right due to irradiation.
Normal actions if MPT curves are exceeded during critical operation are:
Scram reactor
Cool down and depressurize
Conduct engineering evaluation prior to further plant operation
The precaution to be observed when performing a hydrostatic test is to make sure
the pressure is consistent with plant temperatures.
MS-04
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