Known Problems
Duane Arnold's primary containment shell was undersized in the original design.. The "torus direct vent bypass system" retrofit was installed in all 18 Mark I reactors in the late 1980s and is operated by a butterfly valve at the operators' control, after a zero leakage rupture diaphragm breaks prior to reaching the primary containment max design pressure. Operators now have the controls necessary to protect against a rupture of primary containment, however remote..
The reactor has been shut down in unplanned scrams eleven times since the year 2000, as indicated in NRC performance indicator reports.
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