Code Manual for CONTAIN 2.0 - Federation of American Scientists

NFPCHN
nfpchn
FPNAME
fpname
HFLIFE
hflife
FGPPWR
= ndpcon
POWER
fpq
the keyword for specifying the number of fission product elements in a chain.
It also marks the beginning of the input sub-block for that chain. All other
keywords and values for that chain must be given before NFPCHN is
specified again for the next chain. A total of unchain” NFPCHN sub-blocks
should be defined in the FISSION block, where unchain” is specified in the
global CONTROL block.
the number of fission chain elements in a chain. The sum of “nfpchn” over
all chains must add up to the value of “nfce” given in the global CONTROL
block.
the keyword for initiating the specification of the names of each element of
a chain.
the fission product name for the chain element. Speci@ “nfpchn” names,
each taken from the ones declared after FP-NAMES in the MATERIAL input
block.
the keyword for initiating the input of fission product half-lives for all
elements in a chain.
the half-life of a chain element (s). Exactly “nfpchn” values must be entered.
The last element in a chain maybe specified as stable with a zero value of
“hflife.” (Since there is no such thing as a zero half-life, zero is assumed to
represent an infkite half-life or a zero decay constant). Jf a negative value is
given, then its absolute value will be interpreted as the decay constant, k,
where “hflife” = in(2)/1. (s-l)
the number of coefficients in the decay power expression for each element in
a chain. These coefficients are specified after the POWER keyword
discussed below and are used to define a general time-dependent specific
decay power according to Equation (8-5). Note that each chain may have its
own number “ndpcon” of such coefficients. The minimum value of “ndpcon”
is 1 and the maximum is 4. LfFGPPWR is omitted, the value of “ndpcon” is
taken to be 1, and the decay power reduces to a constant. If specified,
FGPPWR should be specified before POWER. Note that a time-dependent
decay power is usefid when fission product groups are modeled (see Section
8.5).
the keyword for initiating input of the power coefficients.
the value of a power coefficient. Specify “ndpcon” values for the first
element in a chain, then “ndpcon” values for the second, and so on, for a total
of “nfpchn” x “ndpcon” values. For each element, the first value is al, the
second, ~, and so forth, where these coefficients are defined in Equation
Rev O 14 41 6/30/97