PRELIMINARY DESIGN REQUIREMENTS ARGONNE BOILING REACTOR (ARBOR) FACILITY. Revision I Page: 22 of 161
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7. Pressure-Relief System
In the event of malfunction of the normal heat removal
mechanisms and failure of reactor shut-down mechanism and/or emer-
gency shut-down coolers, a system of pressure relief is provided to pro-
tect the primary system. This system consists of two pilot-operated back
pressure regulator valves and four relief valves, located on a manifold
between the two reactor steam outlet lines.
The pilot-operated regulator valves are automatic, fea-
turing adjustable set point and proportional band which may be adjusted
from the control room. These valves will be set to operate, first, at
10 to 20% above the current reactor operating pressure. The relief valves
are preset and only serve to protect the reactor system from exceeding
the design pressure. The settings of the four valves are staggered at 50 psi
intervals, with the first valve operating at 2400 psi and the fourth at 2550 psi.
During light water operation these valves will discharge to
the stack. During heavy water operation an attempt will be made to prevent
excessive loss of heavy water from the relief system. In this case the re-
lief valves will discharge to the discharge-storage tanks where condensa-
tion and fluid recovery may occur in any heavy water which may be stored in -
these tanks. If necessary, an additional heat sink will be provided.
8. Shield Cooling System
Heat is generated in the floors, sidewalls and the shield
walls of the top flange cover of the reactor pit as a consequence of the
shielding process. These components are also heated by the hot reactor
vessel. The removal of this combined heat is accomplished by circulat-
ing cooling water through coils imbedded in the aforementioned areas.
The system is composed of a heat exchanger, filter bank,
two circulating pumps (one operating and one stand-by), and a surge drum
which acts as a system supply. This equipment is located in the Primary
System Water Service Area.
The floor coils are divided into six operating and six spare
loops fed through a header and valve system and monitored for temperature,
flow, and radioactivity. The sidewall coils are buried in the lead shielding
cylinder surrounding the reactor vessel. There are 24 operating and 24 spare
alternate coils fed through a header and valve system, also monitored. The
steel and water shield surrounding the control rod drive thimbles on the top -
cover flange is fed through lines attached by quick disconnects located in floor
boxes. The inner faces of the concrete shield segments surrounding this
shield are cooled by internal coils fed in a similar manner.
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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/m1/22/: accessed March 26, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.