Operational Physics Data from the HWCTR Page: 2
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-2-
Vertical Cross Section of the Reactor Vessel
I «. ** . - «HW -.» H ■■IHllllll I m llW—IWIW If — WIlMiWl
The reactor vessel shown in figure 2, is about }j ft high
and has a maximum inside diameter of 7 ft. The bottom head has U3
nozzles through which pass monitor pins for each fuel assembly and
various instrument leads. The top head is bolted to the reactor and
must be removed for charging fuel. The control and safety rod drive
mechanisms are bolted to the head and lift with it when the head is
removed; the dolatched rods remain in the core.
The design pressure is 1500 psig at 315*C and the maximum
power is 70 HW. Currently the reactor power is U5 MV with an outlet
temperature of 250*C at 1200 psig. The system is pressurized with
helium ami the reactor outlet temperature at every operating pressure
is at least 10*C subcooled. Film boiling is permitted at the hot spots.
Heat is removed from the reactor by circulating D^0 at 10, >00 grm first
through the fuel then through the bulk moderator and then through two
vertical U-tubo steam generators. H-0 steam from the boilers carries
off the energy to the atmosphere.
Core Layout
The core contains a driver ring of 2U fuel tubes, each loaded
with 1 kg of U-235 and a burnable boron-stainless steel target. A layout
of the core is sho n in figure 3- Tue central test region can accom-
modate 12 elements up to 10 ft long. The heat removal capacity is 2 Mkr
per position.
A ring of 12 boron-stainless steel rods containing 1 wt »
natural boron provides reactivity control. The six fast shutdown rods,
called safety rods, decrease reactivity by 6% Ak/k in 1.5 seconds and
9% Ak/k in 3 seconds. A backup system can inject a potassium tetra-
borate solution in the moderator to reduce the reactivity by 2U$ Ak/k
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Rusche, Benard Clements, 1931-. Operational Physics Data from the HWCTR, report, September 20, 1963; Oak Ridge, Tennessee.. (https://digital.library.unt.edu/ark:/67531/metadc1201756/m1/3/: accessed April 24, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.