Program - Brookhaven National Laboratory

viewed by a single 8-inch hemispherical photomultiplier tube without using light guides. Light collection
tests are performed with a 210 Po alpha source on a ZnS(Ag) disk. Neutron detection studies include
neutrons from a PuBe source and from the 7 Li(p,n) reaction at the UMass Lowell 5.5 MV CN van de
Graaff accelerator.
RD 3 11:20 AM
Analysis of Pu Isotope in Melted Fuel by Neutron Resonance Transmission: Examination
by Linear Absorption Model
F. Kitatani, H. Harada, J. Takamine, M. Kureta, M. Seya
Japan Atomic Energy Agency
Feasibility study of neutron resonance transmission analysis (NRTA) has been started to quantify nuclear
materials in particle-like debris of melted fuel formed in severe accidents of nuclear reactor such as
Fukushima Daiich nuclear power plants. The achievable measurement accuracy was examined by NRTA
using a linear absorption model for the sample in which substances other than nuclear fuel materials, such
as boron, were contained. In this study, boron and iron were considered to be contained in spent nuclear
fuel as impurities. The D-T neutrons slowed down by a polyethylene moderator were considered to be used
for NRTA. The neutron spectrum was calculated by Monte Carlo simulations. The neutron flight path is
5 m, that is the length between the neutron source and a neutron detector. Neutron absorption spectra
were calculated using the total neutron absorption cross-section by JENDL-4.0. The absorption spectra
together with their errors were evaluated. The achievable accuracy of Pu isotopic density was deduced as
a function of neutron intensity and impurity density. This research was supported by JSGO/MEXT.
RD 4 11:40 AM
Reactor Monitoring with a Short Baseline Neutrino Detector
Yeongduk Kim, HANARO SBL collaboration
Sejong University, Korea
We plan to build a 500-liter liquid scintillator near to the core of HANARO research reactor in Korea. The
reactor thermal power is 30MW. The purpose of the detector is two-fold: to investigate the postulated
reactor neutrino oscillation at short baseline and to study reactor monitoring with a neutrino detector. The
detector will have little overburden, and will be tested off-site from the reactor. Prior to 500-liter detector,
we will construct a proto-type detector of 50-liter, and Gd and 6Li neutron capture will be compared with
respect to background reduction. The proto-type detector will be used to minimize the background events
with an identical depth of overburden. In this way, we can make sure that we can measure the reactor
neutrinos with a significant signal to background ratio. Simulations on the neutrino energy spectra from
various models on the fission rates will be presented.
Session RE Benchmark and Testing
Friday March 8, 2013
Room: Central Park West at 10:30 AM
RE 1 10:30 AM
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