Use of miniature and standard specimens to evaluate effects of irradiation temperature on pressure vessel steels Page: 3 of 7
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Table 2. MHTGR flux spectrum and weighting factors
for calculating the effective fast fluence)
Neutron energies spectrum f r
E > 1.0 MeV 4 1.0
0.1 MeV>E> 1.0MeV 21 0.5
0.4 eV > E > 0.1 MeV 65 0.0025
E < 0.4 eV 10 0.07
specimens from A 212 grade B, A 350 grade LF3, nozzle
weld, seam weld (all from the HFIR archive material), and
high-copper weld [weld 73W from the U.S. Nuclear
Regulatory Commission (NRC) sponsored Fifth Irradiation
Series of the Heavy-Section Steel Irradiation Program,
containing 0.31% Cu] were included in each capsule. The
first four capsules were designed and irradiated by Materials
Engineering Associates in the University of Buffalo Reactor
to an effective fast fluence of I x 107 neutrons/cm2
10.68 x 1018 neutrons/cmn (>1 MeV)] at temperatures of 288,
204, 163, and 121*C (550, 400, 325. and 250"F), respectively.
The irradiation temperature was controlled to within 8"C
( 15*F). The MHTGR flux spectrum is also shown in
Table 2. The effect of neutron spectrum on mechanical
property degradation will be investigated later in specially
designed capsules where the spectrum will be tailored to
match that shown in Table 2. These capsules will be
irradiated in the Ford Nuclear Reactor at the University of
RESULTS AND DISCUSSION
The chemical analysis of the two heats of the A 533
grade B class 1 plates is shown in Table 3. The drop-weight
and CVN impact tests were conducted according to ASTM
Standards E 208-87 and E 23-88, respectively. Values of the
reference temperature (RTNDT), the CVN 41-J temperature,
and the CVN upper-shelf energy are shown in Table 4. The
room temperature tensile test results from regular size test
specimens are shown in Fig. 1(a) and (b). The yield and
ultimate strengths of both steel plate materials increased with
decreasing irradiation temperature.
The 41-J CVN transition temperature shift increased
with decreasing irradiation temperature (in agreement with
the increase in yield strength). The CVN impact energy and
fracture appearance test results from the two heats are
shown in Figs. 2 through 5, respectively. Sample test results
of the CVN impact energy curves with the individual data
points are shown in Figs. 6 and 7 (one curve in the
unirradiated condition and a curve at one irradiation
temperature are shown for each heat of the material). The
CVN test results (41-J, 68-J, and 50% shear shifts) are also
summarized in Table 5. Furthermore, the measured 41-J
transition temperature shifts (AT,,) were compared to those
Table 3. Chemical analysis of MHTGR pressure
vessel steel plates (A 533 grade B class 1)
Element (WI %)
C 0.22 0.20
Mn 1.35 1.47
P 0.007 0.005
S 0.016 0.004
Table 4. Unirradiated properties of A 533 grade B
class 1 pressure vessel steel plates
Plate G Plate H
(0.07% Cu) (0.14% Cu)
RTu = -20-C (-4F) RTNrr = -45*C (-49*F)
Tt = -25*C (-13 F) T41 = -54 C (-66F)
114 J (84 ft-lb) 162 J (119 ft-lb)
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Haggag, F.M.; Nanstad, R.K. (Oak Ridge National Lab., TN (United States)) & Byrne, S.T. (ABB/Combustion Engineering, Inc., Windsor, CT (United States)). Use of miniature and standard specimens to evaluate effects of irradiation temperature on pressure vessel steels, article, January 1, 1991; Tennessee. (https://digital.library.unt.edu/ark:/67531/metadc1057430/m1/3/: accessed March 25, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.