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SHAKTI SURABHI BIO strength PLANT on your again backyard

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The nature of the solutions of Eqs. If =10"* SEC" . org/access_use#pd-google n—rm FIG. 3-1. Chart for response of reactors to a step change in reactivity, positive step only. single differential equation of the seventh order in n. For a step input in Sk the solution will take the form n(0 = (3-3) where the first exponent PI has the same sign as Sk, the input disturbance, and where the other six exponents are negative. 30 Equations (3-1) and (3-2) are a family of linear differential equations with constant coefficients, and there is a definite relationship among the values of Aj, Pji and Sk.

10, no. 8, p. 32, 1952. 2. , and M. C. Edlund: "The Elements of Nuclear Reactor Theory," D. , New York, 1952. 3. , and E. C. , New York, 1950. 4. : "The Science and Engineering of Nuclear Power," vol. , 1947. REACTOR KINETICS 47 5. Isbin, H. , and J. W. Gorman: Applications of Pile-kinetic Equations, Nucleonics, vol. 10, no. 11, p. 68, November, 1952. 6. : Derivation and Integration of the Pile-kinetic Equations, Nucleonics, vol. 5, no. 1, p. 61, July, 1949. 7. , 1953. 8. Schultz, M. : "Automatic Control of Power Reactors," AECD-3163, 1950.

2-15. Inventory of Items Affecting Reactivity. org/access_use#pd-google and poisoning. If these effects are defined in reactivity worth, control rods may also be so rated. Sufficient extra reactivity must be designed into the control rods to hold the reactor safely shut down when all rods are inserted. The amount of negative reactivity needed to keep a reactor safely shut down differs from reactor to reactor. Approximately — 2 per- cent in reactivity is probably the minimum value used. A range of 5 to 10 percent in negative reactivity is more usual for reactor shutdown.

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