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An event sequence diagram, with timing, is particularly helpful. REFERENCES [1] INTERNATIONAL ATOMIC ENERGY AGENCY, Safety of Nuclear Power Plants: Design, Safety Standards Series No. NS-R-1, IAEA, Vienna (2000). [2] INTERNATIONAL ATOMIC ENERGY AGENCY, Safety Assessment and Verification for Nuclear Power Plants, Safety Standards Series No. 2, IAEA, Vienna (2001). [3] INTERNATIONAL ATOMIC ENERGY AGENCY, Accident Analysis for Nuclear Power Plants, Safety Reports Series No. 23, IAEA, Vienna (2002).

ASME Level C (emergency) both with and without the LRVs being credited. The first trip parameter may be credited in the case where this trip parameter is high pressure. Systematic fuel failures are prevented. It is sufficient to prevent prolonged periods in dryout or in stratified flow before reactor trip. Relevant event combinations Since there is no fuel damage for these events, there are no relevant event combinations with impairments of ECC or containment. 9. 1. Initiating events This event class includes rupture of the steam piping inside or outside the reactor building, up to the complete guillotine rupture of the steam balance header.

Reactivity mechanisms. General term for in-core devices that can change reactivity, specifically: adjuster rods, absorber rods, liquid zone controllers, shut-off rods and poison injection nozzles. ROP system. Regional overpower protection system: two spatially distributed networks of flux detectors within the core, each connected to one shutdown system, which will trip the reactor if regional or bulk reactor power is excessive. RRS. Reactor regulating system. Digital system that controls reactivity devices and the major process systems.

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