Unit was operating at 170 MWe with the shut down loops isolated from the reactor inlet and outlet headers and communicated to the bleed condenser to maintain the pressure at 20 kg/cm2 in the shut down loops. On the event date, one of the isolation valves for the north shut down loop had overtravelled resulting in passing of heat transport system water from the north reactor outlet header to the shut down loop and further to the bleed condenser. The bleed condenser high level led to reactor set back. The passing of the isolation valve coupled with the initiation of reactor set back (which caused shrinkage of the heat transport system) resulted in the coolant system pressure to drop and cause reactor trip on low pressure in Primary Heat Transport System. The overtravel of the shut down cooling loop valves was due to suspected inadvertent operation of the relay while working on another relay mounted adjacent to it. The event can be rated as level '0' under A-1R of the INES user's manual.
Behnam Raeesian is an internationally recognized visual artist and poster designer from Iran, known for bold political and cultural works. Through exhibitions, workshops, jury roles, and collaborations with cultural institutions worldwide, he has built a strong voice in contemporary political graphic design. His projects confront complex issues such as nuclear risk and technological impact, transforming […]
Everywhere you look, the nuclear industry’s hype machine is in overdrive. Goldman Sachs, Microsoft, and the UK government all tout small modular reactors as the silver bullet for climate change and energy security. Tech billionaires are hiring nuclear veterans. Wall Street is whispering about “round-the-clock power” for artificial intelligence data centers. For those old enough […]
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