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Opening PCV to avoid Master Fuel Trip

Opening PCV to avoid Master Fuel Trip

Opening PCV to avoid Master Fuel Trip

(OP)
In my power plant there are some safety valves installed in the Boiler. The SV located on the Drum has the highset setting.We also have solenoid operated safety valve (PCV = Pressure Control Valve) installed in the main steam line. One day, there was an accident causing main steam pressure increased rapidly. This was also followed by rapid decreasing drum level. We were so panic. To avoid Master Fuel Trip caused by drum level very low, we opened the PCV manually. We opened it manually because the main steam pressure was still below PCV setting but the drum level was slightly above the Trip Setting. Finally our unit was saved from Forced Outage. Our Question is:
1. Was our action (opening the PCV) in that accident correct?
2. If our action is incorrect, could you give us another solution in overcoming that accident?
Thanks for your attention.  

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