The reactor safety relief valves are attached to the steam line piping to protect the reactor from over-pressure conditions. The 8 fast acting steam dump valves (SDV-C type) discharge into the turbine condenser during over-pressure conditions. Similar to the MSVs, the high pressure header ring off the steam lines is not modeled. Half (four) the SDV-C valves are connected to the LHS and half are on the RHS of the steam line.
Opening Pressure Set-point 7.063 MPa
Closing Pressure Set-point 6.7689 MPa
630 Is the steam line pressure greater than 7.063 MPa (Open the LHS SDV-Cs)?
CARD 206CCCC0, EXPANDED VARIABLE TRIP CARD
Card 20606300
W1(A) VARIABLE CODE = p
W2(I) PARAMETER = 175030000
W1(A) and W2(I) represent the steam line pressure at the LHS SDV-Cs.
W3(A) RELATIONSHIP = ge
W4(A) VARIABLE CODE = null
W5(I) PARAMETER = 0
No comparison value is entered for the second variable
W6(R) ADDITIVE CONSTANT = 7.063e6 Pa
SDV-C pressure setpoint.
W7(A) LATCH INDICATOR = n
W8(R) TIMEOF QUANTITY (s) = It was set to either true (0.0) or false (-1.0) at the initiation of the transient
631 Is the steam line pressure less than 6.7689 MPa (Close the LHS SDV-Cs)?
CARD 206CCCC0, EXPANDED VARIABLE TRIP CARD
Card 20606310
W1(A) VARIABLE CODE = p
W2(I) PARAMETER = 175030000
W1(A) and W2(I) represent the steam line pressure at the LHS SDV-Cs.
W3(A) RELATIONSHIP = le
W4(A) VARIABLE CODE = null
W5(I) PARAMETER = 0
No comparison value is entered for the second variable
W6(R) ADDITIVE CONSTANT = 6.7689e6 Pa
SDV-C pressure setpoint.
W7(A) LATCH INDICATOR = n
W8(R) TIMEOF QUANTITY (s) = It was set to either true (0.0) or false (-1.0) at the initiation of the transient
635 Is the steam line pressure greater than 7.063 MPa (Open the RHS SDV-Cs)?
CARD 206CCCC0, EXPANDED VARIABLE TRIP CARD
Card 20606350
W1(A) VARIABLE CODE = p
W2(I) PARAMETER = 575030000
W1(A) and W2(I) represent the steam line pressure at the RHS SDV-Cs.
W3(A) RELATIONSHIP = ge
W4(A) VARIABLE CODE = null
W5(I) PARAMETER = 0
No comparison value is entered for the second variable
W6(R) ADDITIVE CONSTANT = 7.063e6 Pa
SDV-C pressure setpoint.
W7(A) LATCH INDICATOR = n
W8(R) TIMEOF QUANTITY (s) = It was set to either true (0.0) or false (-1.0) at the initiation of the transient
636 Is the steam line pressure less than 6.7689 MPa (Close the RHS SDV-Cs)?
CARD 206CCCC0, EXPANDED VARIABLE TRIP CARD
Card 20606360
W1(A) VARIABLE CODE = p
W2(I) PARAMETER = 575030000
W1(A) and W2(I) represent the steam line pressure at the RHS SDV-Cs.
W3(A) RELATIONSHIP = le
W4(A) VARIABLE CODE = null
W5(I) PARAMETER = 0
No comparison value is entered for the second variable
W6(R) ADDITIVE CONSTANT = 6.7689e6 Pa
SDV-C pressure setpoint.
W7(A) LATCH INDICATOR = n
W8(R) TIMEOF QUANTITY (s) = It was set to either true (0.0) or false (-1.0) at the initiation of the transient
1629 Are the LHS SDVs already open or is the pressure greater than the opening setpoint (7.063 MPa)?
CARD 206CCCC0, EXPANDED LOGICAL TRIP CARD
Card 20616290
W1(I) TRIP NUMBER = 1631
LHS SDV open signal
W2(A) OPERATOR = or
W3(I) TRIP NUMBER = 630
Above the LHS SDV opening setpoint
W4(A) LATCH INDICATOR = n
W5(R) TIMEOF QUANTITY (s) = It was set to either true (0.0) or false (-1.0) at the initiation of the transient
1630 Are the LHS SDVs already open or is the pressure greater than the opening setpoint (7.063 MPa) and there is power?
CARD 206CCCC0, EXPANDED LOGICAL TRIP CARD
Card 20616300
W1(I) TRIP NUMBER = 1629
LHS SDV open signal
W2(A) OPERATOR = and
W3(I) TRIP NUMBER = -102
Power for the SDVs will be monitored through Trip 102
W4(A) LATCH INDICATOR = n
W5(R) TIMEOF QUANTITY (s) = It was set to either true (0.0) or false (-1.0) at the initiation of the transient
1631 Are the LHS SDVs already open or is the pressure greater than the opening setpoint (7.063 MPa) and the pressure is not below the closing setpoint pressure?
CARD 206CCCC0, EXPANDED LOGICAL TRIP CARD
Card 20616310
W1(I) TRIP NUMBER = 1630
LHS SDV open signal
W2(A) OPERATOR = and
W3(I) TRIP NUMBER = -631
The pressure is not below the LHS SDV closing setpoint
W4(A) LATCH INDICATOR = n
W5(R) TIMEOF QUANTITY (s) = It was set to either true (0.0) or false (-1.0) at the initiation of the transient
1632 Is the LHS SDV-C closed? Note, this trip is required to create a logical opposite of Trip 1631 for the required valve closing trip value in the motor valve input.
CARD 206CCCC0, EXPANDED LOGICAL TRIP CARD
Card 20616320
W1(I) TRIP NUMBER = -1631
Inverse of the LHS SDV open signal
W2(A) OPERATOR = and
W3(I) TRIP NUMBER = -1631
Inverse of the LHS SDV open signal
W4(A) LATCH INDICATOR = n
W5(R) TIMEOF QUANTITY (s) = It was set to either true (0.0) or false (-1.0) at the initiation of the transient
1634 Are the RHS SDVs already open or is the pressure greater than the opening setpoint (7.063 MPa)?
CARD 206CCCC0, EXPANDED LOGICAL TRIP CARD
Card 20616340
W1(I) TRIP NUMBER = 1636
RHS SDV open signal
W2(A) OPERATOR = or
W3(I) TRIP NUMBER = 635
Above the RHS SDV opening setpoint
W4(A) LATCH INDICATOR = n
W5(R) TIMEOF QUANTITY (s) = It was set to either true (0.0) or false (-1.0) at the initiation of the transient
1635 Are the RHS SDVs already open or is the pressure greater than the opening setpoint (7.063 MPa) and there is power?
CARD 206CCCC0, EXPANDED LOGICAL TRIP CARD
Card 20616350
W1(I) TRIP NUMBER = 1634
RHS SDV open signal
W2(A) OPERATOR = and
W3(I) TRIP NUMBER = -102
Power for the SDVs
W4(A) LATCH INDICATOR = n
W5(R) TIMEOF QUANTITY (s) = It was set to either true (0.0) or false (-1.0) at the initiation of the transient
1636 Are the RHS SDVs already open or is the pressure greater than the opening setpoint (7.063 MPa) and the pressure is not below the closing setpoint pressure?
CARD 206CCCC0, EXPANDED LOGICAL TRIP CARD
Card 20616360
W1(I) TRIP NUMBER = 1635
RHS SDV open signal
W2(A) OPERATOR = and
W3(I) TRIP NUMBER = -636
The pressure is not below the RHS SDV closing setpoint
W4(A) LATCH INDICATOR = n
W5(R) TIMEOF QUANTITY (s) = It was set to either true (0.0) or false (-1.0) at the initiation of the transient
1637 Is the RHS SDV-C closed? Note, this trip is required to create a logical opposite of Trip 1636 for the required valve closing trip value in the motor valve input.
CARD 206CCCC0, EXPANDED LOGICAL TRIP CARD
Card 20616370
W1(I) TRIP NUMBER = -1636
Inverse of the RHS SDV open signal
W2(A) OPERATOR = and
W3(I) TRIP NUMBER = -1636
Inverse of the RHS SDV open signal
W4(A) LATCH INDICATOR = n
W5(R) TIMEOF QUANTITY (s) = It was set to either true (0.0) or false (-1.0) at the initiation of the transient