PRELIMINARY DESIGN REQUIREMENTS ARGONNE BOILING REACTOR (ARBOR) FACILITY. Revision I Page: 21 of 161
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The mixture of non-condensable gases and water vapor
leaving the hotwell is throttled to the water-cooled after-condenser, which
removes the major portion of the water vapor. The condensate returns to
the primary water make-up tank. The remaining gases pass either to the
stack during light water operation or to the recombiner during heavy water
operation. The recombiner catalytically recombines the dissociated hydro-
gen and oxygen. This recombined water, probably in the vapor state, to-
gether with the other gases, passes through the dryer in which the remaining
condensables are recovered and returned to the primary water make-up tank.
Remaining gases then pass to the stack.
5. Emergency Shut-Down Cooling System
Since some heat generation from the core continues for a
period of time after reactor shut-down, an emergency shut-down cooling
system is utilized to prevent core or vessel damage resulting from acci-
dental loss of either primary system fluid or primary system heat ex-
Overheating and possible core melting because of the acci-
dental loss of primary system fluid is prevented by the low-pressure core
spray system. This system consists of the low-pressure boric acid tank
located on the reactor operating floor upper level and the core spray ring
located in the upper portion of the reactor vessel. Upon a suitable emer-
gency signal boric acid solution is injected into the vessel through the spray
ring and cools the full core area. Boric acid is added to the water as an
additional safety precaution to maintain reactor subcriticality in the event
of control rod or control system malfunction.
Over-pressurization, resulting in vessel or primary sys-
tem damage, can occur if primary system heat exchanger capacity is acci-
dentally lost. To prevent this damage, evaporative condensers, consisting
of emergency cooling coils, are located in the steam dryers. These coils
are fed with water from the high tank, and the steam generated by decay
heat is condensed by the natural circulation of high tank water. The total
condenser capacity is 24 mw.
6. Chemical Shut-Down System
Normal reactor shut-down is accomplished by means of
neutron-absorbing control rods which can be rapidly injected into the core.
In the event of malfunction of these rods, a chemical shut-down system is
provided. This system consists of two high-pressure boric acid storage
tanks located on the reactor operating floor and an air compressor located
in the Auxiliary Equipment Area. These tanks contain a quantity of concen-
trated boric acid solution held under 3000 psi air pressure by means of the
compressor. The system is properly valved so that the material is always
available for injection, but cannot inadvertently leak into the reactor when not
required. Solenoid valves are operated to inject the solution upon suitable signal.
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Fromm, L.W.; Bernsen, S.A.; Bullinger, C.F. & Matousek, J.F. PRELIMINARY DESIGN REQUIREMENTS ARGONNE BOILING REACTOR (ARBOR) FACILITY. Revision I, report, July 15, 1957; Lemont, Illinois. (https://digital.library.unt.edu/ark:/67531/metadc1023272/m1/21/: accessed March 26, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.