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Example text

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.

As with large LOCAs, differences are usually matters of degree: the most important safety aspect is ensuring sufficient buoyancy driven flow in both loops to maintain channel integrity. 3 as follows: (a) (b) Acceptance criterion (1) becomes: Dose to the most exposed individual in the critical group is below the Event Class 4 limit in Fig. 1. Acceptance criterion (2) becomes: There should be no systematic fuel failures before or immediately after reactor trip. However, some fuel failures may occur during the ECC phase.

RRS. Reactor regulating system. Digital system that controls reactivity devices and the major process systems. set-back. Controlled power reduction through the RRS in response to an abnormal event. sheath. Clad; cladding. shield tank. Low pressure vessel (concrete or steel) containing light water shielding. Supports and contains the calandria. shield tank cooling system. 3% of full thermal power. shutdown cooling system. System to remove decay heat when the reactor is shut down. It can be used at full temperature and pressure conditions in an accident.

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