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Extra resources for Accid. Anal. - Nuclear Powerplants with PWRs

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1. 1. Initiating events and safety aspects An MCP trip due to an interruption of the power supply or failure of the control system is the most typical cause for a reduction of primary coolant flow. Reduction of the primary flow leads to an imbalance between the heat produced by the fuel and the heat removed from the core, potentially exceeding core thermal limits, which means a DNBR. Thermal imbalance also leads to an overall pressureā€“temperature transient, typically resulting in a short term pressurization of both the primary and the secondary circuit.

INITIATING EVENTS AND SAFETY ASPECTS A LOCA is caused by loss of integrity of the primary circuit or its associated pipes and devices. The direct cause of such an accident is a material defect, material fatigue, an external impact (internal missiles or heavy loads) or a device failure during the operation of the plant. Inadvertent opening of the pressurizer valves or any other isolation valve on the primary system boundary 31 can also be analysed as a LOCA. The spectrum of postulated leakage sizes within the reactor coolant pressure boundary has been divided in various ways depending on the selection of the acceptance criteria.

The presence of non-condensable gases influences the physical process during shutdown modes, particularly when the primary circuit is open through the venting lines. Nitrogen can accumulate in some parts of the primary circuit and leads to unexpected re-pressurization.

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Accid. Anal. - Nuclear Powerplants with PWRs

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