Regarding the corium stabilization outside reactor vessel
, there are two preferred methods used for the operating Light Water Reactors: pouring water on top of the melt pool which is discharged from the failed vessel into the normally dry cavity and discharging melt into the wet cavity which is flooded with water before the arrival of the melt.
The thermometer was deemed unavailable for use when it showed an abnormally high electrical resistance level following a sudden increase of temperatures to 60 C on Saturday morning, leaving only one temperature measurement device working properly at the bottom of the reactor vessel
, the utility said.
The check assembly of the reactor vessel
internals and the cover of the upper unit is one of the final stages in the manufacturing process of the reactor vessel
prior to delivery to the customer.
(2) A common nuclear power reactor design in which water flows upward through the core, where it is heated by fission and allowed to boil in the reactor vessel
. The resulting steam then drives turbines, which activate generators to produce electrical power.
ARMS consists of a clear Plexiglas reactor vessel
, filled with 115 tubes (dubbed "membranes") that are home to a community of bacteria.
Before the sampling operation, the sample chamber is located inside the reactor vessel
and is continually immersed in the product.
After the Nuclear Regulatory Commission (NRC) allowed Davis-Besse to delay shutting down to inspect its reactor vessel
for cracked tubing, the plant found that leakage from these tubes had caused extensive corrosion on the vessel head--a vital barrier preventing a radioactive release.
Framatome ANP will also replace the unit's reactor vessel
closure head during this outage.
A steel or cast iron and glass lined reactor vessel
weighing several tonnes could cost the best part of pounds 1m to replace if encrusted drug deposits or stains left from the mixing and chemical reaction of components cannot be removed.
1) Wastewater is collected from PMs 1 and 2 in a reactor vessel
where organic contaminants (measured as biological oxygen demand over a 5-day period, or BO[D.sub.5]) are converted to carbon dioxide and methane gas by anaerobic bacteria.
It was not necessary to contain the whole of the reactor vessel
, but rather to contain the actual process of reactor charging which meant that only the reactor opening needed to be within the containment area.
Among the features of the enlarged pilot plant are the installation of a 500-gallon reactor vessel
, new distillation units and flaking roll, and a modern control room computerized to monitor intermediate reactions.