Category Archives: NUCLEAR ELECTRIC POWER

GRID DISCONNECTION FOR A NUCLEAR STATION WITH FUNCTIONING "SCRAM&quot

The previous examples illustrate the practical value of linearized models in solving operational problems in both fossil and nuclear power stations. However, the large rapid power variations in accident situations invalidate linear models, and comprehensive non-linear simulations are crucial in order to provide confirmation that internal plant constraint boundaries are never breached (e. g., boiler and turbine temperature profiles). Statistics […]

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ЁSome Aspects of Nuclear Accidents and Their Mitigation

4.1 REACTOR ACCIDENT CLASSIFICATION BY PROBABILITIES The robustness of an engineering system is limited by economic factors in the sense that expenditure is only justified in making the plant adequate for its intended purpose. Failure to recognize this principle results in the equipment losing its market or not being built, through either excessive price, or on the other hand lack […]

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A PROLOGUE

Though esoteric control engineering theory might be outside some reader’s interest, a brief overview of Nyquist’s [131] and Rosenbrock’s [123,134] theorems is necessary in order to appreciate the practical problems described in Chapters 2 and 3. Here the stabilities of neutron reactor kinetics, flow in boiling channels and a national electricity Grid are analyzed. At first sight it appears surprising […]

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HAZARDS FROM AN ATMOSPHERIC RELEASE OF FISSION PRODUCTS

Catastrophic breaches of a reactor vessel and its reinforced concrete containment by an MFCI, a disintegrating plant fragment or a hydrogen explosion are circumspectly engineered to be highly improbable. From all precursors the aggregate probability is typically no greater than 10“7 per operating year, or assuming a Poissonian distribution there is an expectation of one such rare event in 10 […]

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FEATURES OF THE BUBEX CODE AND AN MFTF SIMULATION

An abrupt release of pressurized Argon from the MFTF charge con­tainer and a record of the cover gas pressure transient were made as part of rig commissioning. Various one-dimensional fluid dynamics models proved unsuccessful in calculating this transient despite their use in other MFCI simulations.27 A spatially higher dimensional model is therefore necessary for authenticity. In fact a sufficiently accurate […]

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Adequacy of Linear Models and Nuclear Reactor Dynamics

2.1 LINEAR MODELS, STABILITY, AND NYQUIST THEOREMS All forms of commercial power generation involve the controlled manipulation of plant variables to achieve a prescribed contribution to national demand. In fossil and nuclear plants the heat source, boiler feed pumps and turbine control valves are the pertinent items. For wind turbines the rotor-blade angle and generator excitation are the relevant quantities. […]

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