Project background

The key energy constructing project during the period∏ of the 11th Five-Year Plan

Hongyanhe Nuclear power plant is the first nuclear power p±lant in Northeast of China

Ningde Nuclear power plant is the first island nuclear power plant in Chin&a and the first nuclear power plant on the west coast of the Strait

Scale: both plants use 4x1000MWe pwr nuclear power €unit

Technique approach: CPR1000

EPC: China Nuclear Power Engineering Co., Ltd.

System structure

System involves equipment as follows: main control cabinet (PLC and drive cabσinet), console, manual alarming button, signal switching box, small &alarms all over the plant and big alarms installed outσside the room.

System object

The audible alarm system is used to alarm audibly within the accident plant or all ✘over the plant and guide people withdrawing or taking the emergency duty →when accident occurs.

The system is controlled by PLC and produce alarm according to the start-up signal sen♥t from the console, the manual alarm button or externa l system. PLC receives the signal and make a logic•al judgment and relevant process to make alarm at specific region pr£oducing specific sound to alarm, meanwhile, the relevant indicat≤or at the console is lighten up.

Network topology