Damping of Xenon Oscillations in the Maine Yankee Reactor

Corcoran, W.R.; Humphries, J.R.; Litke, H.J.; LeBlanc, Justin D.

doi:10.13182/nt74-a31407

Cited by 18 publications

(10 citation statements)

References 2 publications

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“…After the spatial xenon oscillations were identified, the nuclear industry experi mentally studied the stability of reactors and the effectiveness of the proposed control strategies [10,17,18,19,20,21,22]. At the same time, there were several occurrences reported to the Nuclear Regulatory Commission [23], regarding controlled xenon os cillations in PWRs.…”

Section: Chapter 2 Control Of Spatial Xenon Oscillationsmentioning

confidence: 99%

See 1 more Smart Citation

Knowledge base expert system control of spatial xenon oscillations in pressurized water reactors

Alten

Danofsky

1993

Annals of Nuclear Energy

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Section: Chapter 2 Control Of Spatial Xenon Oscillationsmentioning

confidence: 99%

“…The First Overtone Control strategy was also used during the xenon oscillation experiments in the Maine Yankee Plant proving its effectiveness [22]. The timing of the control is the main problem of these strategies.…”

Section: Early Control Strategiesmentioning

confidence: 99%

Knowledge base expert system control of spatial xenon oscillations in pressurized water reactors

Alten

Danofsky

1993

Annals of Nuclear Energy

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“…It is also known that the latter is convergent and the former can be divergent. 2,5) However, when the reactor size becomes larger than the current design, then the radial oscillation may be also divergent. Even if the radial oscillation is convergent, when some control rod malfunction occurs, it is necessary to suppress the oscillation in as short a time as possible.…”

Section: Introductionmentioning

confidence: 98%

“…This issue has been studied in both numerical simulations and experiments since the introduction of large PWRs. [1][2][3][4][5][6][7] The characteristics of the oscillation have been well understood and the control procedures are also established, thus xenon oscillations cause no operational difficulties. 6,[8][9][10][11] There are mainly two modes of oscillation; one is axial oscillation and the other one is radial oscillation.…”

Section: Introductionmentioning

confidence: 99%

Xenon Oscillation Control in Large PWRs Using a Characteristic Ellipse Trajectory Drawn by Three Axial Offsets

Shimazu

2008

J. Nucl. Sci. Technol.

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We have proposed a very simple xenon oscillation control procedure for axial xenon oscillation control based on a characteristic trajectory. The trajectory is drawn by three offsets of power distributions, namely, AOp, AOi, and AOx, which are defined as the axial offset (AO) of power distribution, AO of power distribution under which the current iodine distribution is obtained as the equilibrium, and that for xenon distribution, respectively. When these offsets are plotted on the X-Y plane for (AOp À AOx, AOi À AOx) the trajectory shows a quite characteristic ellipse (or an elliptic spiral). When the plot is at the origin of the X-Y plane, no xenon oscillation exists. Using the characteristics of the ellipse, the xenon oscillation can be eliminated by guiding the plot to the origin with control rod operation. In this paper, we will present an innovative and very simple procedure to generate the trajectory for the prediction of the oscillation behavior. Using the prediction capability of the xenon oscillation, the optimal control search calculation can be done. Since it is calculated by simple trigonometric functions and an exponential function, the prediction takes less than 1 s with a PC. It is especially effective for radial xenon oscillation control when the control rod motion is not flexible as for axial xenon oscillation control.

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“…This issue has been studied both in numerical simulations and experiments since the introduction of large PWRs. [1][2][3][4][5][6][7] The characteristics of the oscillation have been well understood and control procedures have been established; hence, such xenon oscillations do not cause operational difficulties. 6,[8][9][10][11][12] In other words, xenon oscillations in divergent mode can be terminated by control procedures before the amplitude of the oscillation becomes too large to continue full-power operation.…”

Section: Introductionmentioning

confidence: 99%

Optimal Control Timing Search of Xenon Oscillations in Large PWRs Using a Characteristic Ellipse Trajectory Based on Three Axial Offsets

Shimazu

2009

Journal of Nuclear Science and Technology

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We have proposed a simplified control procedure for axial xenon oscillations in large PWRs based on a characteristic ellipse trajectory method. However, this procedure cannot guarantee that the desired control rod position can be achieved when the xenon oscillation is terminated. In a previous paper, we proposed an innovative and very simple procedure to generate the trajectory for the predicted oscillation behavior, which can be expressed by trigonometric functions multiplied by an exponential function. By using this prediction capability, it is shown that the optimal control timing can be easily determined to terminate the xenon oscillation at the desired control rod position. The optimal timing is obtained at the intersection or, cross point, of two predicted trajectories, the forward trajectory beginning from the current position and the backward trajectory that is generated based on the desired control rod position. Since the trajectories are calculated by simple trigonometric functions and an exponential function, the prediction takes only a few seconds using a PC.

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Damping of Xenon Oscillations in the Maine Yankee Reactor

Cited by 18 publications

References 2 publications

Knowledge base expert system control of spatial xenon oscillations in pressurized water reactors

Knowledge base expert system control of spatial xenon oscillations in pressurized water reactors

Xenon Oscillation Control in Large PWRs Using a Characteristic Ellipse Trajectory Drawn by Three Axial Offsets

Optimal Control Timing Search of Xenon Oscillations in Large PWRs Using a Characteristic Ellipse Trajectory Based on Three Axial Offsets

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