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.
Read more about this topic: Duane Arnold Energy Center
Famous quotes containing the word problems:
“Our young people are diseased with the theological problems of original sin, origin of evil, predestination, and the like. These never presented a practical difficulty to any man,—never darkened across any man’s road, who did not go out of his way to seek them. These are the soul’s mumps, and measles, and whooping- coughs, and those who have not caught them cannot describe their health or prescribe a cure. A simple mind will not know these enemies.”
—Ralph Waldo Emerson (1803–1882)
“I rarely speak about God. To God, yes. I protest against Him. I shout at Him. But to open a discourse about the qualities of God, about the problems that God imposes, theodicy, no. And yet He is there, in silence, in filigree.”
—Elie Wiesel (b. 1928)