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8 bar). 8 bar). 8 bar). 8 bar). 8 bar). 8 bar). 8 bar). 8 bar). 8 bar). 5 Boiling Curves at 500 psi Boiling tests were conducted at a higher pressure of 500 psi. The boiling curves for pure deionized water at 500 psi are presented below in Figure 5-36. For lower heat fluxes, the boiling curves match well indicating that natural convection heat transfer is dominate. 1 Tests with Boric Acid Solution Figure 5-37 shows the results with 500 ppm boric acid. The variation in heat transfer coefficient is observed in Figure 5-38.

This certain limiting lithium coolant concentration is 2000 ppm - beyond this concentration, the nucleation pattern is unchanged. 5 bar). 5 bar). 5 psi). 5 psi). 5 bar). 5 bar). 5 bar). 5 bar). 5 bar). 6 Boiling Curves at 1000 psi Boiling tests done at 1000 psi are very significant as it approaches the pressure typical of PWR conditions. Figure 5-55 shows the boiling curves for deionized water at 1000 psi for tests numbered 951 through 954. The boiling curves show a similar trend for all the subcooled conditions and saturated conditions as those of lower pressures.

8% in heat transfer coefficient case of 500 ppm lithium metaborate (test #666) at 30 o C subcooling. 72 kW/m2oC at a similar heat flux value and 30 oC subcooling. 00 40 41 42 43 44 Superheat (oC) 45 Linear (500 ppm LiBO2, 30 Subcooling, #666) Figure 5-5 Comparison of deionized water and 500 ppm concentrated lithium metaborate test results. 9 bar). 9 bar). 9 bar). 9 bar). 33 Test results with 2000 ppm boric acid solution are presented in Figure 5-6 where considerable change in pool boiling heat transfer coefficients with 2000 ppm boric acid solution occurs.

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