Abstract

This work aims to characterize the neutron spectrum in the beam going out of the university research reactor (VR-1) using tubular-type of the nuclear fuel, version 4M (IRT-4M) fuel. Thanks to its variability, the core is often rearranged to fulfill different research tasks. Measurements with new core configuration have been carried out to confirm the spectrum shape in the neutron beam of the radial channel remains unchanged even though the core has been rearranged. Based on this finding, the VR-1 can be considered as a mockup for other IRT-4M fueled reactors, even with higher power. The neutron spectrum stability has been proven by measurement and by comparison of measurements done on the C12 and C13 cores. Fast neutron spectrum in the channel has been evaluated by means of neutron spectrometry by scintillation detector and activation materials (Au, Co, Ni, Al, Fe, and NaI). If the neutron field stability is proven, the radial channel beam can be used for evaluation of spectrum weighted cross section disregarding changes in the core configuration. Assuming reactions with higher threshold, their rates can be compared with rates obtained in the pure prompt fission neutron spectrum (PFNS), since earlier measurements have shown that the neutron spectrum in the light water reactor cavity is equal to the PFNS above 6 MeV threshold. Result 1.1831 mb for 127I(n,2n) reaction evaluated from the VR-1 activation measurement demonstrates good agreement of the measured reaction rate with tabulated rate averaged in 235U PFNS, confirming the neutron spectrum stability and equality to the PFNS.

References

References
1.
Rataj
,
J.
,
Huml
,
O.
,
Heraltova
,
L.
, and
Bily
,
T.
,
2014
, “
Benchmark Experiments for Validation of Reaction Rates Determination in Reactor Dosimetry
,”
Radiat. Phys. Chem.
,
104
, pp.
363
367
.10.1016/j.radphyschem.2014.02.004
2.
Košťál
,
M.
,
Cvachovec
,
F.
,
Ošmera
,
B.
,
Hansen
,
W.
, and
Juříček
,
V.
,
2010
, “
Thermal Scatter Treatment of Iron in Transport of Photons and Neutrons
,”
Ann. Nucl. En
g.,
37
(
10
), pp.
1290
1304
.10.1016/j.anucene.2010.05.020
3.
Košťál
,
M.
,
Matěj
,
Z.
,
Losa
,
E.
,
Huml
,
O.
,
Štefánik
,
M.
,
Cvachovec
,
F.
,
Schulc
,
M.
,
Jánský
,
B.
,
Novák
,
E.
,
Harutyunyan
,
D.
, and
Rypar
,
V.
,
2018
, “
On Similarity of Various Reactor Spectra and 235U Prompt Fission Neutron Spectrum
,”
Appl. Radiat. Isotopes
,
135
, pp.
83
91
.10.1016/j.apradiso.2018.01.028
4.
Košťál
,
M.
,
Losa
,
E.
,
Matěj
,
Z.
,
Juříček
,
V.
,
Harutyunyan
,
D.
,
Huml
,
O.
,
Štefánik
,
M.
,
Cvachovec
,
F.
,
Mravec
,
F.
,
Schulc
,
M.
,
Czakoj
,
T.
, and
Rypar
,
V.
,
2018
, “
Characterization of Mixed N/G Beam of VR-1 Reactor
,”
Ann. Nucl. Energy
,
122
, pp.
69
78
.10.1016/j.anucene.2018.08.028
5.
Kropik
,
M.
,
Matějka
,
K.
, and
Juříčková
,
M.
,
2009
,
New Digital I&C for VR-1 Training Reactor, 6th American Nuclear Society International Topical Meeting on Nuclear Plant Instrumentation, Control, and Human-Machine Interface Technologies 2009
, Vol.
1
,
Knoxville, TN
, pp.
521
532
.
6.
Kropik
,
M.
, and
Jurickova
,
M.
,
2011
, “
Calibration of New I&C at VR-1 Training Reactor
,”
Nucl. Eng. Des.
,
241
(
4
), pp.
1090
1096
.10.1016/j.nucengdes.2010.05.049
7.
Kropik
,
M.
,
Rataj
,
J.
, and
Sunka
,
M.
,
2012
, “
I&C Improvements at VR-1 Training Reactor, (2012) 8th International Topical Meeting on Nuclear Plant Instrumentation, Control, and Human-Machine Interface Technologies 2012
,”
NPIC HMIT 2012: Enabling Future Nuclear Energy
, Vol.
1
,
San Diego, CA
, pp.
1
12
.
8.
Stefanik
,
M.
,
Rataj
,
J.
,
Huml
,
O.
, and
Sklenka
,
L.
,
2017
, “
Study of Dietary Supplements Compositions by Neutron Activation Analysis at the VR-1 Training Reactor
,”
Radiat. Phys. Chem.
,
140
, pp.
471
474
.10.1016/j.radphyschem.2017.03.017
9.
Michálek
,
S.
,
Števo
,
S.
,
Farkas
,
G.
,
Haščík
,
J.
,
Slugeň
,
V.
,
Rataj
,
J.
, and
Kolros
,
A.
,
2010
, “
Determination of the Effective Delayed Neutron Fraction for Training Reactor VR-1
,”
Prog. Nucl. Energy
,
52
(
8
), pp.
735
742
.10.1016/j.pnucene.2010.05.002
10.
Košťál
,
M.
,
Losa
,
E.
,
Baroň
,
P.
,
Šolc
,
J.
,
Švadlenková
,
M.
,
Koleška
,
M.
,
Mareček
,
M.
, and
Uhlíř
,
J.
,
2017
, “
Measurement of 89Y(n,2n) Spectral Averaged Cross Section in LR-0 Special Core Reactor Spectrum
,”
Rad. Phys. Chem.
,
141
, pp.
22
28
.10.1016/j.radphyschem.2017.05.027
11.
Košt'ál
,
M.
,
Schulc
,
M.
,
Šimon
,
J.
,
Burianová
,
N.
,
Harutyunyan
,
D.
,
Losa
,
E.
, and
Rypar
,
V.
,
2018
, “
Measurement of Various Monitors Reaction Rate in a Special Core at LR-0 Reactor
,”
Ann. Nucl. Energy
,
112
, pp.
759
768
.10.1016/j.anucene.2017.10.036
12.
Chadwick
,
M. B.
,
Herman
,
M. B.
,
Obložinský
,
P.
,
Dunn
,
M. E.
,
Danon
,
Y.
,
Kahler
,
A. C.
,
Smith
,
D. L.
,
Pritychenko
,
B.
,
Arbanas
,
G.
,
Arcilla
,
R.
,
Brewer
,
R.
,
Brown
,
D. A.
,
Capote
,
R.
,
Carlson
,
A. D.
,
Cho
,
Y. S.
,
Derrien
,
H.
,
Guber
,
K.
,
Hale
,
G. M.
,
Hoblit
,
S.
,
Holloway
,
S.
,
Johnson
,
T. D.
,
Kawano
,
T.
,
Kiedrowski
,
B. C.
,
Kim
,
H.
,
Kunieda
,
S.
,
Larson
,
N. M.
,
Leal
,
L.
,
Lestone
,
J. P.
,
Little
,
R. C.
,
McCutchan
,
E. A.
,
MacFarlane
,
R. E.
,
MacInnes
,
M.
,
Mattoon
,
C. M.
,
McKnight
,
R. D.
,
Mughabghab
,
S. F.
,
Nobre
,
G. P. A.
,
Palmiotti
,
G.
,
Palumbo
,
A.
,
Pigni
,
M. T.
,
Pronyaev
,
V. G.
,
Sayer
,
R. O.
,
Sonzogni
,
A. A.
,
Summers
,
N. C.
,
Talou
,
P.
,
Thompson
,
I. J.
,
Trkov
,
A.
,
Vogt
,
R. L.
,
van der Marck
,
S. C.
,
Wallner
,
A.
,
White
,
M. C.
,
Wiarda
,
D.
, and
Young
,
P. G.
,
2011
, “
ENDF/B-VII.1 Nuclear Data for Science and Technology: Cross Sections, Covariances, Fission Product Yields and Decay Data
,”
Nucl. Data Sheets
,
112
(
12
), pp.
2887
2996
.10.1016/j.nds.2011.11.002
13.
Mirion Technologies,
2000
, “
GENIE™ Gamma Analysis Software
,” Mirion Technologies, accessed May 19, 2020, https://www.mirion.com/products/genie-2000-gamma-analysis-software
14.
Cvachovec
,
J.
, and
Cvachovec
,
F.
,
2008
, “
Maximum Likelihood Estimation of a Neutron Spectrum and Associated Uncertainties
,”
Adv. Mil. Technol.
,
3
(
2
), pp.
67
79
.http://aimt.unob.cz/vol3is2.htm
15.
Košťál
,
M.
,
Šoltés
,
J.
,
Viererbl
,
L.
,
Matěj
,
Z.
,
Cvachovec
,
F.
,
Rypar
,
V.
, and
Losa
,
E.
,
2017
, “
Measurement of Neutron Spectra in a Silicon Filtered Neutron Beam Using Stilbene Detectors at the LVR-15 Research Reactor
,”
Appl. Radiat. Isotopes
,
128
, pp.
41
48
.10.1016/j.apradiso.2017.06.026
16.
Veškrna
,
M.
,
Matěj
,
Z.
,
Mravec
,
F.
, and
Přenosil
,
V.
,
2014
, “
Digitalized Two Parametric System for Gamma/Neutron Spectrometry
,”
18th Topical Meeting of the Radiation Protection & Shielding Division of ANS (ANS RPSD 14)
,
Knoxville, TN
, Sept.
14
18
.https://is.muni.cz/publication/1210637/RPSD2014_-_Digitalized_two_parametric_system_for_gammaneutron_spectrometry.pdf
17.
Goorley
,
T.
,
James
,
M.
,
Booth
,
T.
,
Brown
,
F.
,
Bull
,
J.
,
Cox
,
L. J.
,
Durkee
,
J.
,
Elson
,
J.
,
Fensin
,
M.
,
Forster
,
R. A.
,
Hendricks
,
J.
,
Hughes
,
H. G.
,
Johns
,
R.
,
Kiedrowski
,
B.
,
Martz
,
R.
,
Mashnik
,
S.
,
McKinney
,
G.
,
Pelowitz
,
D.
,
Prael
,
R.
,
Sweezy
,
J.
,
Waters
,
L.
,
Wilcox
,
T.
, and
Zukaitis
,
T.
,
2012
, “
Initial MCNP6 Release Overview
,”
Nucl. Technol.
,
180
(
3
), pp.
298
315
.10.13182/NT11-135
18.
Schulc
,
M.
,
Košťál
,
M.
,
Capote
,
R.
,
Novák
,
E.
,
Šimon
,
J.
,
Burianová
,
N.
, and
Wallner
,
A.
,
2019
, “
Validation of Selected (n,2n) Dosimetry Reactions in IRDFF-1.05 Library
,”
Appl. Radiat. Isotopes
,
143
, pp.
132
140
.10.1016/j.apradiso.2018.10.027
19.
Dryák
,
P.
,
Šolc
,
J.
, and
Kovář
,
P.
,
2012
, “
Correction of the True Summations in Volume Sources
,”
Appl. Radiat. Isotopes
,
70
(
9
), pp.
2130
2132
..10.1016/j.apradiso.2012.02.073
20.
Dryak
,
P.
, and
Kovar
,
P.
,
2009
, “
Table for True Summation Effect in Gamma-Ray Spectrometry
,”
J. Radioanal. Nucl. Chem.
,
279
, pp.
385
–3
94
.10.1007/s10967-007-7208-x
21.
Boson
,
J.
,
Ågren
,
G.
, and
Johansson
,
L.
,
2008
, “
A Detailed Investigation of HPGe Detector Response for Improved Monte Carlo Efficiency Calculations
,”
Nucl. Instrum. Methods Phys. Res., Sect. A
,
587
(
2–3
), pp.
304
314
.10.1016/j.nima.2008.01.062
22.
Košťál
,
M.
,
Schulc
,
M.
,
Rypar
,
V.
,
Losa
,
E.
,
Burianová
,
N.
,
Šimon
,
J.
,
Mareček
,
M.
, and
Uhlíř
,
J.
,
2017
, “
Validation of Zirconium Isotopes (n,g) and (n,2n) Cross Sections in a Comprehensive LR-0 Reactor Operative Parameters Set
,”
Appl. Radiat. Isotopes
,
128
, pp.
92
100
.10.1016/j.apradiso.2017.06.023
23.
Brown
,
D. A.
,
Chadwick
,
M. B.
,
Capote
,
R.
,
Kahler
,
A. C.
,
Trkov
,
A.
,
Herman
,
M. W.
,
Sonzogni
,
A. A.
,
Danon
,
Y.
,
Carlson
,
A. D.
,
Dunn
,
M.
,
Smith
,
D. L.
,
Hale
,
G. M.
,
Arbanas
,
G.
,
Arcilla
,
R.
,
Bates
,
C. R.
,
Beck
,
B.
,
Becker
,
B.
,
Brown
,
F.
,
Casperson
,
R. J.
,
Conlin
,
J.
,
Cullen
,
D. E.
,
Descalle
,
M.-A.
,
Firestone
,
R.
,
Gaines
,
T.
,
Guber
,
K. H.
,
Hawari
,
A. I.
,
Holmes
,
J.
,
Johnson
,
T. D.
,
Kawano
,
T.
,
Kiedrowski
,
B. C.
,
Koning
,
A. J.
,
Kopecky
,
S.
,
Leal
,
L.
,
Lestone
,
J. P.
,
Lubitz
,
C.
,
Márquez Damián
,
J. I.
,
Mattoon
,
C. M.
,
McCutchan
,
E. A.
,
Mughabghab
,
S.
,
Navratil
,
P.
,
Neudecker
,
D.
,
Nobre
,
G. P. A.
,
Noguere
,
G.
,
Paris
,
M.
,
Pigni
,
M. T.
,
Plompen
,
A. J.
,
Pritychenko
,
B.
,
Pronyaev
,
V. G.
,
Roubtsov
,
D.
,
Rochman
,
D.
,
Romano
,
P.
,
Schillebeeckx
,
P.
,
Simakov
,
S.
,
Sin
,
M.
,
Sirakov
,
I.
,
Sleaford
,
B.
,
Sobes
,
V.
,
Soukhovitskii
,
E. S.
,
Stetcu
,
I.
,
Talou
,
P.
,
Thompson
,
I.
,
van der Marck
,
S.
,
Welser-Sherrill
,
L.
,
Wiarda
,
D.
,
White
,
M.
,
Wormald
,
J. L.
,
Wright
,
R. Q.
,
Zerkle
,
M.
,
Žerovnik
,
G.
, and
Zhu
,
Y.
,
2018
, “
ENDF/B-VIII.0: The 8 th Major Release of the Nuclear Reaction Data Library With CIELO-Project Cross Sections, New Standards and Thermal Scattering Data
,”
Nucl. Data Sheets
,
148
, pp.
1
142
.10.1016/j.nds.2018.02.001
24.
Žerovnik
,
G.
,
Podvratnik
,
M.
, and
Snoj
,
L.
,
2014
, “
On Normalization of Fluxes and Reaction Rates in MCNP Criticality Calculations
,”
Ann. Nucl. Energy
,
63
, pp.
126
128
.10.1016/j.anucene.2013.07.045
25.
Košťál
,
M.
,
Schulc
,
M.
,
Losa
,
E.
,
Šimon
,
J.
,
Burianová
,
N.
,
Novák
,
E.
,
Mareček
,
M.
,
Uhlíř
,
J.
,
Czakoj
,
T.
,
Rypar
,
V.
,
Juříček
,
V.
,
Capote
,
R.
, and
Trkov
,
A.
,
2020
, “
A Reference Neutron Field for Measurement of Spectrum Averaged Cross Sections
,”
Ann. Nucl. Energy
,
140
, p.
107119
.10.1016/j.anucene.2019.107119
26.
Trkov
,
A.
,
2020
, “
RR_UNC—Calculate Uncertainties in Reaction Rates
,”
NDS IAEA
,
Vienna, Austria
, accessed June 11, 2020, https://www-nds.iaea.org/IRDFF/listings/rr_unc_9278-B71.pdf
You do not currently have access to this content.