<p>This paper first introduces the background, purpose and implementation process of SDP, and then analyzes the SDP based on the disabled fault of the switch port of DCS layer 1 in nuclear power plant.This DCS failure caused 14 ports between the room level switch and the unit level switch on the first floor of DCS to be disabled, resulting in partial interruption of communication between the room level switch and the unit level switch, resulting in abnormal connection between KIC / BUP and the first floor, and all KIC control functions and Some control functions of BUP are no longer available.In order to prevent the fluctuation of working conditions from introducing new disturbance to the control system, the unit has been maintaining stable operation.During the whole event, the reactor was in a safe state, the reactor protection system was available, the three barriers were complete, and no radioactive material was released.The influence of DCS failure on core safety is analyzed by SDP, and the conclusion is given.SDP is based on Probabilistic Safety Assessment (PSA),PSA technology is an important application tool in the risk guided nuclear power plant regulatory system to evaluate the importance of safety issues found in the power plant and give risk opinions. It is used to assist analysts to identify issues that have an impact on the safety of the nuclear power plant, and to evaluate and grade these issues, so that regulators can timely judge the impact of relevant issues on the risk of the nuclear power plantThe degree of influence.</p>

Psa Analysis of Switch Port Disabled on Dcs Layer 1

Paper Proceedings: https://asmedigitalcollection.asme.org/ICONE/ICONE28/volume/85246

2021 28th International Conference on Nuclear Engineering (ICONE28)

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