This allows, in the event of an emergency, the control rods
to move faster through the channel.
A reactor has more than 50 control rods
that are designed to drop into nuclear fuel in case of a power failure or other problems, preventing a meltdown of the reactor.
Soon after the reactor was powered down, the plant's managers discovered that a number of the control rods
had failed to drop into the proper position to slow or stop the nuclear reaction.
Incidents, including power failures, spilled radioactive material and dropped reactor control rods
, were branded a "disgrace".
Employees safely completed the work that will reduce the friction between the control rods
and fuel assemblies and will improve the operation of plant equipment," said Neil Gannon, vice president of Nuclear Operations for PPL Susquehanna.
Nitruvid was founded in 1985 and has patented a number of plasma assisted nitriding processes especially for stainless steel applications, one technique being a process which dramatically enhances the life expectancy of control rods
used in nuclear reactors.
Boeing's long-running problems with the 737 rudder, thought to have been finally settled six years ago with the redesign of the power control units (PCU), have resurfaced with the discovery of fractures in the input control rods
to the units, and a subsequent call for wide-ranging corrective action by the US Federal Aviation Administration.
The primary servos, the control rods
and the swashplate are all connected.
They enable control of thermal output from the reactor by precisely inserting the control rods
into the reactor core during regular operation.
These errors range from minor (the control rods
in Fermi's CP-1 reactor were made of cadmium, which absorbs neutrons, not of graphite, which slows them down) to fundamental conceptual errors (U-235 does not decay during a chain reaction, it fissions).
The metaphor is apt, mostly because you don't really need control rods
unless you're also in the business of creating nuclear reactions.
From the summer of 1915 to the fall of 1918--think how many aviation accidents there were just because of reliability of the machines or reliability of the engines or struts or wires or tires or control rods
, push rods, hinges, and so for him to survive from the summer of 1915 until 1918 in these early machines is a tribute to his skill and to his mechanics' ability because it's widely known in the Lafayette Escadrille that his airplane was the most expertly maintained.
This AD requires inspection of the small jam nut on the elevator tab control rods
to detect inspection putty and to determine its condition; a torque check of the small and large jam nuts on the tab control rod
, if necessary; and corrective actions as applicable.
Enriched boron is used in control rods
in nuclear reactors and for containing used nuclear fuel due to its high neutron absorbability.
For the flight tests, special electronic actuators driven by Gilyard's system were installed in place of standard control rods
in the ailerons' control linkage.