analog rod position indication system “irpi”indication
TRANSCRIPT
Analog Rod Position Indication System “IRPI”Indication System “IRPI”
Section 8.2
Objectives (IRPI)1. State the purpose of the rod position indication
system.
2. Briefly describe the operation of the following:
a Individual (analog) Rod Position Indicationa. Individual (analog) Rod Position Indication,
b. Group demand position indication, and
c. Bank demand position indication
3. List the conditions that will initiate a rod deviation alarm.
Purpose(s)• Provide indication of actual and demanded
control rod position.– Actual: IRPI
– Demanded: Step counters (Group)
P/A converters (Bank)
• Provide alarms for misaligned rods.
• Provide alarms for excessive rod insertion to ensure shutdown margin.
4
5Fig. 8.2-2: Rod Bottom / Rod Drop Alarm
8.2.3.8 Rod Deviation Monitor(Main Plant Computer Program) OBJ -3
• Rods within bank > ±12 steps from demand
• Any 2 rods within bank > 12 steps from each other
• S/D bank rod <220 steps
• Control banks not in proper sequence• Control banks not in proper sequence
Digital Rod Position Indication System “DRPI”System “DRPI”
Section 8.3
Objectives (DRPI)1. State the purpose of the rod position indication
system.
2. Briefly describe the operation of the following:
a Individual (digital) Rod Position Indicationa. Individual (digital) Rod Position Indication,
b. Group demand position indication, and
c. Bank demand position indication
3. List the conditions that will initiate a rod deviation alarm.
Purpose(s)• Provide indication of actual and demanded
control rod position.– Actual: DRPI
– Demanded: Step counters (Group)
P/A converters (Bank)
• Provide alarms for misaligned rods.
• Provide alarms for excessive rod insertion to ensure shutdown margin.
B19
A20
B20
A21
B21
DATA CABINET"B"
CONTROL BOARDDISPLAY UNIT
Figure RPI - 2.1DRPI AND GROUP DEMAND SYSTEMS
Ref to Figure 8.3-1
A1
B1
A2
B2
A3
B3
A4
B4
A5
B5
A6
DATA CABINET"A"
RPI - 165/96
Containment
ROD CONTROLSYSTEM
2 2 6 2 2 6 2 2 6 2 2 6
2 2 6 2 2 6 2 2 6 2 2 6
2 2 6 2 2 6 2 2 6 2 2 6
2 2 6 2 2 6
2 2 6
GROUP DEMANDSTEP COUNTERS
11
Fig. 8.3-1
BANK A
CENTRALCONTROLFAILURE
RODDEVIATION
URGENTALARM
1 R 2
1 2 3
1 2 3
GW
228
168
192
144
216
Figure RPI - 5.2DRPI DISPLAY
BANK BGW
228
168
192
144
216
BANK CGW
228
168
192
144
216
BANK AGW
228
210
BANK B BANK C BANK D BANK EGW
228
210
CONTROL SHUTDOWN
BANK DGW
228
168
192
144
216
100% - no failures
Figure 8.3-3
ALARMS
DATA AFAILURE
DATA BFAILURE
1 2 3
1 2 3
1 2 3
120
96
72
48
24
RB
RPI - 305/96
120
96
72
48
24
RB
120
96
72
48
24
RB
TR
18
RB
TR
18
RB
E11 L11 L5E5 H6 F8 H10 K8 F2 B10 K14 P6 B6 F14 P10 K2 H2 B8 H14 P8 F6 F10 K10 K6 D4 M12 D12 M4 H8 D2 B12 M14 P4 B4 D14 P12 M2 G3 C9 J13 N7 C7 G13 N9 J3 E3 C11 L13 N5 C5 E13 N11 L3 H4 D8 H12 M8
120
96
72
48
24
RB
Fig. 8.3-4
8.3.4 Rod Deviation Monitor(Main Plant Computer Program) OBJ -3
• Rods within bank > ±12 steps from demand
• Any 2 rods within bank > 12 steps from each other
• S/D bank rod <220 steps
• Rods operating out of sequence• Rods operating out of sequence
Rod Insertion Limits
Section 8.4
Objectives1. State the purposes of the control rod
insertion limits (RILs).
2. List the inputs into the rod insertion limit computers and comparatorscomputers and comparators.
3. Explain why the rod insertion limits increase with increasing reactor power.
Purposes• Maintain an adequate shutdown margin,
• Maintain nuclear peaking factors within limits, and
• Minimize the reactivity effects on the core due to an ejected rod.
COMPARATOR
TAUCTIONEERED HIGH
Figure 8.4-1 Rod Insertion Limit Circuit
COMPUTER
AUCTIONEERED HIGHT AVG
COMPUTER
CONTROL BANK"A" POSITION
COMPUTER COMPUTER
CONTROL BANK"B" POSITION
CONTROL BANK"D" POSITION
CONTROL BANK"C" POSITION
COMPARATOR COMPARATOR COMPARATOR
“A” “B” “C” “D”
19
LOWALARM
LOW-LOWALARM
RECORDER
LOWALARM
LOW-LOWALARM
LOWALARM
LOW-LOWALARM
LOWALARM
LOW-LOWALARM
PO
SIT
ION
(ST
EP
S)
Figure 8.4-2 Rod Insertion Limits vs. Thermal Power
BANK C
228
200
150
(0.0, 118)
(0.55,228)
(1.0, 189)
20
BANK D
FRACTION OF RATED THERMAL POWER
RO
DB
AN
KP
100
50
(0.05,0) .2 .4 .6 .8 1.0