States method axial peaks

The States-TPPI method does not suppress these axial peaks, but moves them to the edge of the spectrum so that they are less likely to obscure wanted peaks. All that is involved is that, each time td is incremented, both the phase of the pulse which precedes q and the receiver phase are advanced by 180° i.e. the... 

The bumup profile of the density reactivity coefficient of the equilibrium core is shown in Fig. 2.61 [9]. Although the calculation methods used in this chapter are not accurate enough to state the precise density coefficient values, the tendency of the density reactivity coefficient to decrease with the cycle bumup exposure can be seen. This decreasing trend is due to the increase in the core average density with the bumup from about 0.50 g/cm at the BOC to about 0.57 g/cm at the EOC. The gradual increase of the core average water density can be explained by the gradual shift of the axial core power distribution from the bottom peak to the top peak towards the EOC. As the axial power distribution shifts to the top peak, the axial... 

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