III. REACTOR-OPERATING EXPERIENCE 13 IV. ANALYSIS OF POTENTIAL MODES OF FAILURE PROPAGATION 17 A. Fission-gas Release. V. OPERATION WITH DEFECTED FUEL 45 A. Fission Products Released from Failed Pins to Coolant 45 B. Sodium-Fuel Chemical Reaction 46 VI. SUMMARY AND CONCLUSIONS 50 9. Lower and Upper Gas-Liquid Interface inside an FFTF Fuel Subassembly vs Time after Simultaneous Rupture of 10 or More Fuel Pins at the Outlet Region of the Core, Assuming Zero Gas-flow Resistance 29 10. The Effects of Support Length L and Peak Pressure p Q on Moment M max 31 11. The Effects of Fuel-pin Radius and Temperature on Moment: t = 0.014 in 31 12. The Effects of Fuel-pin Radius and Temperature on Moment: t = 0.010 in 32 13. Flow Passing through a Porous Bed 36 14. Maximum Porous-bed Thickness to Produce Coolant Boiling for Various Bed Porosities and Particle Sizes 37 15. UO 2 Particle Sizes from Interactions with Sodium 38 16. Model of Coolant-channel Blockage 38 17. Coolant-temperature Increase Downstream of a Blockage 39 18. Detection of an Inlet Blockage 40 19. Flow-blockage Model 40 20. Bubble Growth and Collapse for Local Boiling behind a 50% Flowarea Blockage in an FFTF Subassembly 41 21. Velocity of Coolant Stream Required to Sweep Out Fuel Debris. . 44 22. Fuel-element Swelling vs Time after Failure 47
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