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Definition

Probabilistic Risk Assessment

PRA

Systematic methodology for evaluating nuclear plant risk. Level 1 (core damage frequency), Level 2 (containment performance + source term), Level 3 (offsite consequences).

Related terms

Payload

The instrument or system that performs the mission's primary function. For Earth observation: cameras or sensors. For co...

Perigee

The point in an orbit closest to the central body. For Earth orbits, the lowest altitude above Earth's surface....

Phase Gate

A review milestone where a program's readiness to proceed to the next development phase is evaluated. Standard gates inc...

Power Budget

An accounting of electrical power generation (solar panels, batteries) and consumption (subsystems, payload, heaters) ac...

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