Among the speakers was physicist Michio Kaku, who noted that one of the reactor pressure vessels had been installed backwards and called on California governor Jerry Brown ( then considered an environmentalist ) to shut them down.
32.
Preparations were made to inject water into the reactor pressure vessel once external power could be restored to the plant, as water levels in the reactors were considered to be declining . through new cables and transformers.
33.
One scenario consists of the reactor pressure vessel failing all at once, with the entire mass of corium dropping into a pool of water ( for example, coolant or moderator ) and causing extremely rapid generation of steam.
34.
On 27 March, the IAEA reported temperatures at the bottom of the Reactor Pressure Vessel ( RPV ) at Unit 2 fell to 97 �C ( 206.6 �F ) from 100 �C ( 212 �F ) on Saturday.
35.
On May 16, 2013, Shearon Harris Unit 1 initiated an unplanned shutdown when reviews of ultrasonic data from a refueling outage in spring 2012 determined a 1 / 4 " flaw was inside the 6 "-thick Reactor Pressure Vessel Head.
36.
IRIS is a smaller-scale design for a Pressurized water reactor ( PWR ) with an integral reactor coolant system layout, meaning the steam generators, pressurizer, control rod drive mechanisms, and reactor coolant pumps are all located within the reactor pressure vessel.
37.
Long-term integrity of the compact reactor pressure vessel is maintained by providing an internal neutron shield . ( This is in contrast to early Soviet civil PWR designs where embrittlement occurs due to neutron bombardment of a very narrow pressure vessel .)
38.
Feedwater from the feedwater heaters enters the reactor pressure vessel ( RPV ) through nozzles high on the vessel, well above the top of the nuclear fuel assemblies ( these nuclear fuel assemblies constitute the " core " ) but below the water level.
39.
In 2002, the USA had what former NRC Commissioner Victor Gilinsky termed " its closest brush with disaster " since Three Mile Island's 1979 meltdown; a workman at the Davis-Besse reactor found a large rust hole in the top of the reactor pressure vessel.
40.
Marine reactors are designed for long core life, enabled by the relatively high enrichment of the uranium and by incorporating a " burnable reactor pressure vessel is extended by providing an internal neutron shield, which reduces the damage to the steel from constant bombardment by neutrons.
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