Reserve water pool

The secondary side of the containment steam heat exchangers are connected to the reserve water pool, with circulation established through gravity-driven flow. With this, heat from an LOCA event will be deposited into the reserve water pool through the containment steam condensers. 

The primary function of the isolation condensers (ICs) is to passively remove sensible and core decay heat from the reactor, preventing reactor overpressure, and to serve as a long-term cooling system under station blackout conditions. The IC heat exchangers connect with the reactor coolant piping and remove heat from the reactor by depositing this into the reserve water pool. 

The IC system is divided into two independent trains, with each train consisting of a piping loop running from the reactor outlet, to heat exchangers located in the reserve water pool, and returning to the reactor inlet. The system is pressurized and on hot standby under normal reactor operations. A connection valve is located on the system s low point near the reactor inlet and is closed under normal reactor operations. The closed valve disrupts the flow through the system to minimize heat loss. 

The IC relies on the difference of densities between the IC hot leg and cold leg fluid to initiate and maintain a gravity-driven circulalion. Under station blackout conditions the reactor can be depressurized and cooled by first closing the main steam and feed-water isolation valves, followed by opening the IC coimection valve. The liquid column normally trapped by the coimection valve is allowed to flow into the reactor inlet. As fliis drains into the reactor, the IC heat exchanger tubing will be exposed to steam from the reactor outlet, allowing heat transfer to the reserve water pool. Further steam produced by the reactor due to the decay heat will sustain the circulation. 

The primary function of the reserve water pool is to serve as a buffer between the passive safety systems and the ultimate heat sink. The large mass of water available in the... 

The PMCS serves as an additional barrier to core damage. In an accident scenario, decay heat generated in the fuel within the fuel channel is transferred through radiation from the cladding to the inner liner of the insulator, flows through the channel insulator and pressure tube, and is deposited into the moderator. The PMCS uses a flashing-driven natural circulation loop to remove heat from the moderator, and it deposits the heat into the reserve water pool. 

A wide range of substances that are toxic to the cornea may produce epithelial insult known as toxic keratitis. This terminology is generally reserved for mild superficial corneal irritation after contact with a harmful substance. Solutions foreign to the eye that commonly cause toxic keratitis include shampoos, lotions, and chlorinated pool water. Toxic corneal reactions have been reported from tonometer tips contaminated with 70% isopropyl alcohol or hydrogen peroxide that was not fully removed after disinfection of the probe. Irreversible corneal scarring has resulted from inadvertent ocular contamination with chlorhexidine gluconate, a skin cleanser used preop-eratively. The mistaken use of nonophthalmic products for eyedrops may result in various forms of corneal trauma. 

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The hot water procedure will extract free monosaccharides and soluble polysaccharides, such as starches and reserve cell material. Hydrolysis of more labile a-1,4 linked polysaccharides may occur during the extraction procedure at near-neutral pH and add to the pool of monosaccharides. Estimations of the monosaccharide contents of aqueous extracts follow the method earlier described after suitable dilution to attain the analytical range, which depends on the amount of extracted particulate matter. In regions of high productivity dilution up to 10-fold with distilled water may be necessary. Oligo- and polysaccharide contents of aqueous extracts may be determined after hydrol3rsis as outlined earlier. 

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