Fasteners for nuclear reactor systems

A nuclear reactor system, comprising:

• a support plate that includes a flange that extends beyond a perimeter of the support plate, wherein the flange includes an aperture with a longitudinal aperture axis;
• and
• a latch assembly that includes a latch housing with a longitudinal latch axis and is disposed above the flange, wherein the latch housing is configured and arranged for at least a first and a second rotational orientation;
• and
• a core barrel that includes a support block that extends beyond a perimeter of the core barrel, wherein the flange of the support plate is disposed vertically intermediate the support block and the latch housing, and the support block is configured to restrain a downward displacement of the support plate such that when the latch housing is in the first rotational orientation, the support plate is locked to the core barrel,
• wherein when the latch housing is in the first rotational orientation, the longitudinal latch axis is substantially aligned with the longitudinal aperture axis of the flange and the latch housing is receivable through the aperture of the flange such that the latch housing does not restrain an upward displacement of the support plate, and
• when the latch housing is in the second rotational orientation, the longitudinal latch axis is substantially transverse to the longitudinal aperture axis and the latch housing is not receivable through the flange such that the latch housing restrains the upward displacement of the support plate.