The Model Room · MR-034
THE INDICATOR READ FULL. HE DRAINED THE CORE. THE GAUGE MEASURED PRESSURE NOT LEVEL.
On March 28, 1979, a pressuriser relief valve at Clearwater Valley Nuclear Station stuck open, leading operator Dennis Halford to misinterpret a key gauge. He ordered the shutdown of vital coolant pumps, mistakenly believing the core was full when it was empty, resulting in half the fuel rods melting.
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