Survey of recent applications of reactor noise techniques at Argonne National Laboratory Page: 2 of 43
This article is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided to Digital Library by the UNT Libraries Government Documents Department.
The following text was automatically extracted from the image on this page using optical character recognition software:
Recent applications of reactor noise techniques to the improvement of
subcritical reactivity and aeff measurements in fast critical assemblies and
to fast power reactor surveillance by neutrornacoustic noise cross corre-
lation are reviewed.
The Inverse Kinetics Rod Drop (IKRD) technique has been the primary
subcriticality measurement technique applied at ANL because of its relative
insensitivity to counter efficiency and prompt lifetime changes and the
fact that a near-critical reference is not needed. Estimates of the random
errors in IKRD reactivity measurements resulting from noise effects have
been developed by simulation studies and theoretical analysis. Relative
standard deviations of 1 to 20% are indicated by these methods for initial
Ak from -0.0005 to -0.035, respectively, under conditions typical of the
Fast Test Reactor (FTR) mockup experiments in the ZPR-9 Fast Critical Facility.
Space-dependent kinetics calculations have been applied to the IKRD technique
to study systematic errors that are functions of detector location as well as
changes in kinetics parameters and effective source strength in the course of
a rod drop. In various situations, systematic errors from these causes may
be as low as several parts per hundred for detectors located outside the
axial reflector due to cancellation of errors. For other detector locations,
the principal error components might be in the same direction, thereby ampli-
fying the resultant error.
Noise measurements have been used as cross checks on IKRD results. The
break frequency derived from cross power spectral density or polarity corre-
lation has been found not to be a good reactivity estimator in fast power
reactor critical assemblies presumably because wide disparities between neu-
Here’s what’s next.
This article can be searched. Note: Results may vary based on the legibility of text within the document.
Tools / Downloads
Get a copy of this page or view the extracted text.
Citing and Sharing
Basic information for referencing this web page. We also provide extended guidance on usage rights, references, copying or embedding.
Reference the current page of this Article.
Lewis, R.A.; Bennett, E.F.; Carpenter, S.G.; Cohn, C.E. & Price, C.C. Survey of recent applications of reactor noise techniques at Argonne National Laboratory, article, September 20, 1974; Illinois. (digital.library.unt.edu/ark:/67531/metadc1019413/m1/2/: accessed January 19, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.