Download Aging study of boiling water reactor high pressure injection by D A Conley; Jerald L Edson; C F Fineman; Idaho National PDF

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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The signal is sealed in and prevents restart of the system until the isolation circuits are manually reset. Failure of the turbine exhaust inboard rupture diaphragm is detected by pressure switches at 70 kpa (10 psig) and also results in a sealed-in isolation signal. 7 MPa (100 psig), will generate an isolation signal, but this signal is not sealed in and will allow automatic system initiation if the vessel pressure rises. 1 Initiation and Shutdown. Initiation of the system occurs if a low-low reactor vessel water level signal or a high pressure in the containment drywell signal is received.

The following sections describe each of these methods of automatic operation of the HPI system. the reactor, the HPI system is isolated because of low steam line pressure. 7 MPa (100 psig), the system configures for normal operation standby mode. If a rupture or a major leak occurs in the steam line, pressure or temperature switches energize relays to isolate the system. An automatic-isolation signal closes the steam line and suppression pool isolation valves and trips the turbine. The signal is sealed in and prevents restart of the system until the isolation circuits are manually reset.

Failure-to-operate is the most significant failure mode that affects the system’s ability to function and, therefore, affects plant safety. A valve’s failure to indicate its 27 NUREG/CR-5462 Aging Degradation and Stressors hydraulic and pneumatic lines all contribute to failures of valves and valve operators. is subject to wear caused by the steam, water in the steam, and from improper lubrication problems. The control system is affected by the stressors that degrade electronic and electrical systems.

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