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Monitoring the thermal power of nuclear reactors with a prototype cubic meter antineutrino detector
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10.1063/1.2899178
/content/aip/journal/jap/103/7/10.1063/1.2899178
http://aip.metastore.ingenta.com/content/aip/journal/jap/103/7/10.1063/1.2899178

Figures

Image of FIG. 1.
FIG. 1.

(a) The predicted relative daily antineutrino emission rate vs cycle day. The rate is normalized to its value at the beginning of the cycle. (b) The percent change in the instantaneous antineutrino emission rate over the previous period vs cycle day.

Image of FIG. 2.
FIG. 2.

The SONGS1 detector, deployed at the San Onofre Nuclear Generating Station unit 2 reactor.

Image of FIG. 3.
FIG. 3.

A representative interevent time spectrum of event pairs that passes all selection cuts acquired during of data taking. The fit to the data has four parameters: an exponent and amplitude each for the fast and slow exponentials describing the correlated signal and coincident singles background, respectively.

Image of FIG. 4.
FIG. 4.

A histogram of the number of antineutrinolike events per hour interval before (black) and during (light gray) the reactor outage.

Image of FIG. 5.
FIG. 5.

(a) The hourly number of antineutrinolike events, plotted vs hour, through a reactor outage. (b) The value of the SPRT statistic plotted vs hour over the same time range. The dashed lines in this figure are the 99% confidence level values of the test statistic. In both plots, the vertical line indicates the hour in which the reactor shutdown occurred. Values of the statistics above the upper dashed indicate that the reactor is in the on state. For this data set, these values are obtained only during the reactor on period, meaning that no false positives or negatives occurred.

Image of FIG. 6.
FIG. 6.

(a) The hourly number of antineutrinolike events, plotted vs hour, through a reactor ramp from 0% to 80% power. (b) The value of the SPRT statistic plotted vs hour over the same time range. The dashed lines have significance analogous to those in Fig. 5.

Image of FIG. 7.
FIG. 7.

(a) The hourly number of antineutrinolike events, plotted vs hour, through a reactor ramp from 80% to 100% power. (b) The value of the SPRT statistic plotted vs hour over the same time range. The dashed horizontal lines have significance analogous to those in the lower plot in Fig. 5. The solid vertical line shows the hour in which 100% thermal power was obtained.

Image of FIG. 8.
FIG. 8.

A histogram of events passing all antineutrino selection cuts during a long reactor off period.

Image of FIG. 9.
FIG. 9.

Events per day passing all antineutrino selection cuts during a long reactor off period, plotted vs day.

Image of FIG. 10.
FIG. 10.

The histograms of the ratio of defined as the net daily or weekly average detected antineutrino rate to the net detected antineutrino rate averaged over the prior to the measurement. Both the daily and weekly data sets extend over the same period.

Tables

Generic image for table
Table I.

The antineutrino event selection criteria.

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/content/aip/journal/jap/103/7/10.1063/1.2899178
2008-04-09
2014-04-18
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Monitoring the thermal power of nuclear reactors with a prototype cubic meter antineutrino detector
http://aip.metastore.ingenta.com/content/aip/journal/jap/103/7/10.1063/1.2899178
10.1063/1.2899178
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