COMPONENT LIFE EXTENSION
The effects of radiation on vessel materials impact heatup/cooldown limits for PWRs, and increase hydrostatic test temperatures for BWRs, significantly limiting plant operation.
Structural Integrity manages reactor vessel integrity, with technical support including pressure-temperature curve development; reviews of RPV materials surveillance programs; setpoint evaluations; pressurized thermal shock evaluations; vessel fluence evaluations; and evaluations of projected vessel properties.
Service water systems, especially those that are safety related, are required to be redundant; they are subjected to a wide variety of operating conditions (e.g., intermittent flows, extended periods of stagnation) such that many systems spend most of their lives in wet lay-up that make water treatments difficult and corrosion problematic.
Structural Integrity is highly adept at characterizing and evaluating degradation and damage to justify continued operation until mitigative measures or planned repairs can be implemented.