"Emergency shutdown" means turning off or stopping something immediately in a critical or urgent situation to prevent further harm or damage. Full definition
As evidenced by the reliability of the electric grid during Indian Point's many unplanned emergency shutdowns, the grid would remain intact even if the plant shut down permanently tomorrow. (riverkeeper.org)
In the present case, the reactor behaved as designed to scram (= emergency shutdown) during an earthquake. (dotearth.blogs.nytimes.com)
Troubleshooting and repair of fast paced manufacturing lines during emergency shutdowns saving the loss of product and time. (jobhero.com)