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Message Subject *** Fukushima *** and other nuclear-----updates and links
Poster Handle Waterbug
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This sort of issue is where I believe the next catastrophe will begin...
Except.. it won't be in Japan..

Fission Stories #117: Slow Valves at Shearon Harris and Slow Response by NRC
[link to allthingsnuclear.org]


The valves had been installed during construction of the plant more than a quarter of a century earlier. The valves’ manufacturer introduced models having internal parts more resistant to corrosion but had never recommended that customers with older valves upgrade them. Workers at Harris replaced all three main steam isolation valves with the new models. The replacement valves were re-tested successfully.

The NRC dispatched a special inspection team to Harris in 2012. The NRC found that from the plant’s initial startup until 2000, workers had exercised the main steam isolation valves every three months per the manufacturer’s recommendation. These exercises involved closing each valve ten percent to verify proper functioning of the valves, their actuators, and controls. The plant’s owner discontinued this recommended testing in 2000 as a cost-saving measure. The safety evaluation per 10 CFR 5.59 performed in 2000 for discontinuing the quarterly exercising failed to mention that the valve vendor recommended the exercising or to discuss potential new failure modes – like the one that happened – that might be introduced by eliminating the periodic exercises.
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