By D A Conley; Jerald L Edson; C F Fineman; Idaho National Engineering Laboratory.; U.S. Nuclear Regulatory Commission. Office of Nuclear Regulatory Research. Division of Engineering
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Extra resources for Aging study of boiling water reactor high pressure injection systems
In addition, some of these mechanisms have only recently been identified to be acting in nuclear plants and, therefore, are not completely understood. If these mechanisms are not monitored and mitigated where possible, they can limit the life of components and systems and decrease plant safety. Some typical aging degradation mechanisms are fatigue, wear, corrosion, erosion, and embrittlement; some typical stressors include water hammer, testing, maintenance, and operation. Each aging mechanism and stressor affects different materials and components to varying degrees.
3 Turbine Lubrication. Figure 6 shows a lube oil layout and the components that are supplied with lubrication from this system. During HPCI startup and shutdown, lube oil is circulated by a 30-kW (40-hp) 250-V dc auxiliary oil pump until the main oil pump, which is driven by the HPCI turbine shaft, develops adequate discharge pressure. When the main oil pump has reached operating discharge pressure during startup, a pressure switch stops the auxiliary oil pump. The auxiliary oil pump is started again during shutdown when the main oil pump can no longer supply the required operating pressure.
If an initiation signal is received during manual operation, the system will automatically realign itself for injection. The HPI system can also be manually shut down from the control room by tripping the turbine and positioning all the valves and switches to normal standby status. 1 Main Steam. The main steam system provides the HPCI turbine steam through a branch line from a main steam line. This branch is on the upstream side of the inboard main steam isolation valve. If this supply steam pressure is low, the HPCI system will isolate because the pressure is not enough to operate the turbine.