Pressure is maintained by steam in a pressurizer (see diagram). From Wordnik.com. [Nuclear power reactor] Reference
A PIRATE RAID UNAWARE THAT TOM lay helpless inside the jetmarine, Mr. Swift and the rest of the group waited around the massive concrete pressurizer as the test period ended. From Wordnik.com. [Tom Swift Jr And His Jetmarine]
"The pressurizer relief tank remained intact," a statement from the NRC said. From Wordnik.com. [Breaking News - The Post Chronicle] Reference
Added the opposing classes sitting opposite the contestants, this is a very good pressurizer. From Wordnik.com. [Anime Nano!] Reference
The event involved the improper flow of reactor coolant water into the pressurizer relief tank. From Wordnik.com. [post-gazette.com - News] Reference
They thought the pressurizer was becoming dangerously full of water, when it actually was leaking. From Wordnik.com. [post-gazette.com - News] Reference
Mistakenly, they reduced water flow into the pressurizer, thus reducing available water to cool the reactor, which began to overheat. From Wordnik.com. [post-gazette.com - News] Reference
Neil Sheehan, an NRC spokesman, said the pressurizer is filled with a combination of water and air, and is used to balance pressure levels in the primary cooling loop. From Wordnik.com. [post-gazette.com - News] Reference
The TMI accident occurred when a valve in a pressurizer, which regulates pressure inside the reactor system, failed to close, giving technicians inadequate information and leaving them unable to understand what was happening. From Wordnik.com. [post-gazette.com - News] Reference
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