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WT = turbine control valve flow rate
WD = steam dump valve flow rate
WB = steam line break flow rate
The specific volume and specific internal energy are given by :
The main steam pressure is determined from the equation of state (i.e. steam table look-up) :
The flow between the steam generators and the main steam system has the following form:
Where
PSG = steam generator pressure
Ph = main steam pressure
KV = main steam isolating valve loss coefficient
KNZ = flow restrictor loss coefficients
W = steam flow rate
AV = total isolation valve flow area
ANZ = flow restriction throat area
h = steam density
The steam flow rate determined by equation (5.11-6) should not exceed choke flow
conditions. Steam flow rates through the turbine valves and steam dump valves and the steam
line break flow, are all assumed to be choked flow.
5.12.
Control and protection systems
The control systems available in this simulator include those systems as described in
Section 2.2 “PWR control loops”. In this section, brief model descriptions are provided for
the following systems:
(1)
(2)
(3)
(4)
Pressurizer pressure control system
Pressurizer level control system
Steam generator three element level control system
Steam generator pressure control system
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