Physics aspects of operation in event of a large reactivity loss Page: 4 of 16
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Distribution
Da Albertson
RD Carter
RA Chitwood
DW Constable
JR Yerguson
ac Farimer
JR Fredsall
LL Grunmme
3W Hagam<
RB Heiple
JF Jakievick
AR Kosmata
DR Nebrough
SL Stewart
AD Vaughn
GF Owsley
300 File
Record CenterJanuary 29, 1962
P'U8ICS ASPECTS OF OPERATION
IN IVENT OF A LARGE REACTIVITY TOSSIN'3OUJCTION
The following information was prepared to assist the physicist who encounters
a large reactivity loss as in a water soaked lattice or a more permanent loss
as in the case of balls remaining in the pile after a ball drop. The dis-
cussion is based on experience gained during F Reactor's severe water leak of
July 27, 1961.
HISTORY
F Reactor scrammed on July 27, 1961, due to a panellit low trip on tube 3063 -
top rod bank near side. Inlet and outlet gas pressure went full-scale immedi-
ately after scram. Inlet and outlet driplegs began dumping five minutes after
the scram. Graphite temperature on stringer 2662 dropped to 30* within 45
minutes. About five hours later, after the flow in the tube was determined,
the column was discharged and the water shut off.
Inspection of the tube showed a large (one square inch) hole nine feet down-
stream from the front Vanstone and on the top of the tube. An estimated 3,000
to 5,000gallons of water entered the graphite resulting in a large reactivity
loss in the lower two-thiri c" the near side of the reactor. The reactivity
oIsTRiBUT)ON OF Tmis DOCU viEN IS UNLIMITEDDECLISSIF E
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Heiple, R. B. Physics aspects of operation in event of a large reactivity loss, report, January 29, 1962; Richland, Washington. (https://digital.library.unt.edu/ark:/67531/metadc1317894/m1/4/: accessed June 10, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.