Lgs Ilt - Srm, Irm, & Prnm Rod Blocks & Scram

Front 1

SRM Power Range

Back 1

10-9 % power to 10-3 % power

Front 2

IRM Power Range

Back 2

10-4 % power to 40 % power

Front 3

LPRM Power Range

Back 3

10-3 % power to 125 % power

Front 4

APRM Power Range

Back 4

0 % power to 125 % power

Front 5

Rodblock Setpoint & When Bypassed

SRM Upscale

Back 5

Setpoint - < 1x10-5 CPS

Bypassed
• Any time associated SRM channel is bypassed
• Any time all four associated IRM channels are on Range 8 or above
• Reactor Mode Switch in "RUN"

Front 6

Rodblock Setpoint & When Bypassed

SRM Inoperative (INOP)

Back 6

• Channel module unplugged
• Channel Mode Switch (AER) not in "OPERATE"
• Low detector high voltage (<90%)

Bypassed
• Any time associated SRM channel is bypassed
• Any time all four associated IRM channels are on Range 8 or above
• Reactor Mode Switch in "RUN"

Front 7

Rodblock Setpoint & When Bypassed

SRM Downscale

Back 7

< 3 CPS

Bypassed
• Any time associated SRM channel is bypassed
• Any time all four associated IRM channels are on Range 3 or above
• Reactor Mode Switch in "RUN"

Front 8

Rodblock Setpoint & When Bypassed

SRM Not Fully Inserted And Indicating £ 100 CPS

Back 8

Associated SRM channel count rate
< 100 CPS AND all four associated IRM channels on Range 2 or below

Bypassed
• Any time associated SRM channel is bypassed
• Any time all four associated IRM channels are on Range 8 or above
• Reactor Mode Switch in "RUN"
• Any time associated SRM channel count rate >100 CPS
• Any time all four associated IRM channels are on Range 3 or above

Front 9

SCRAM Setpoint & When Bypassed

SRM Upscale (High-High)

Back 9

> 2x10-5 CPS

Bypassed
• When associated shorting links are installed
• Any time associated SRM channel is bypassed

Front 10

SCRAM Setpoint & When Bypassed

SRM Inoperative (INOP)

Back 10

Loss of power to associated SRM channel only

Bypassed
When associated shorting links are installed

Front 11

Rodblock Setpoint & When Bypassed

IRM Upscale

Back 11

> 85/125

Bypassed
• Any time associated IRM channel is bypassed
• Reactor Mode Switch in "RUN"

Front 12

Rodblock Setpoint & When Bypassed

IRM INOP

Back 12

• Channel module unplugged or other hardware failure
• Channel Mode Switch (AER) not in "OPERATE"
• Low detector high voltage (<90V)

Bypassed
• Any time associated IRM channel is bypassed
• Reactor Mode Switch in "RUN"

Front 13

Rodblock Setpoint & When Bypassed

IRM Downscale

Back 13

< 5/125

Bypassed
• Any time associated IRM channel is bypassed
• Reactor Mode Switch in "RUN"
• Any time associated IRM channel is on Range 1

Front 14

Rodblock Setpoint & When Bypassed

IRM Not Fully Inserted

Back 14

Associated IRM detector not fully inserted

Bypassed
• Any time associated IRM channel is bypassed
• Reactor Mode Switch in "RUN"

Front 15

SCRAM Setpoint & When Bypassed

IRM Upscale (High-High)

Back 15

> 120/125

Bypassed
• Any time associated IRM channel is bypassed
• Reactor Mode Switch in "RUN"

Front 16

SCRAM Setpoint & When Bypassed

IRM Inoperative (INOP)

Back 16

• Channel module unplugged or other hardware failure
• Channel Mode Switch (AER) not in "OPERATE"
• Low detector high voltage (<90V)

Bypassed
• Any time associated IRM channel is bypassed
• Reactor Mode Switch in "RUN"

Front 17

PRNMS ROD WITHDRAWAL BLOCK
STP Upscale
(Mode Switch NOT in RUN)

Back 17

> = 12%

(Reactor Mode Switch not in "RUN")

Front 18

PRNMS ROD WITHDRAWAL BLOCK
Neutron Flux Downscale

Back 18

< = 3.2%

(Reactor Mode Switch in "RUN")

Front 19

PRNMS ROD WITHDRAWAL BLOCK
LPRM Low Count

Back 19

< 20 per channel
< 3 per axial level

Front 20

PRNMS ROD WITHDRAWAL BLOCK
Simulated Thermal Power
·         Two Recirc Loop Operation

Back 20

> = 0.65W + 54.3%

(Reactor Mode Switch in "RUN")

Front 21

PRNMS ROD WITHDRAWAL BLOCK
Simulated Thermal Power
·         Single Recirc Loop Operation

Back 21

> = 0.65(W - 7.6) + 54.1%

(Reactor Mode Switch in "RUN")

Front 22

PRNMS ROD WITHDRAWAL BLOCK
Simulated Thermal Power
·         Clamped

Back 22

108%

(Reactor Mode Switch in "RUN")

Front 23

PRNMS ROD WITHDRAWAL BLOCK
Inoperative

Back 23

Critical self-test fault
Chassis mode switch in "INOP"
Watchdog timer times out
Loss of both power supplies to APRM channel

Front 24

PRNMS ROD WITHDRAWAL BLOCK
Recirculation Flow Upscale

Back 24

> = 113.4% (see COLR)

Front 25

PRNMS SCRAM
Neutron Flux Upscale
(Mode Switch NOT in RUN)

Back 25

> = 15%

(Reactor Mode Switch not in "RUN")

Front 26

PRNMS SCRAM
Neutron Flux Upscale

Back 26

> = 118.3%

(Reactor Mode Switch in "RUN")

Front 27

PRNMS SCRAM
Simulated Thermal Power
·         Two Recirc Loop Operation

Back 27

> = 0.65W + 61.7%

(Reactor Mode Switch in "RUN")

Front 28

PRNMS SCRAM
Simulated Thermal Power
·         Single Recirc Loop Operation

Back 28

> = 0.65(W - 7.6) + 61.5%

(Reactor Mode Switch in "RUN")

Front 29

PRNMS SCRAM
Simulated Thermal Power
·         Clamped

Back 29

116.6%

(Reactor Mode Switch in "RUN")

Front 30

PRNMS SCRAM
Inoperative

Back 30

Critical self-test fault
Chassis mode switch in "INOP"
Watchdog timer times out
Loss of both power supplies to APRM channel

Front 31

PRNMS SCRAM
OPRM
·         Period Based Detection Algorithm (PBDA)

Back 31

> = 14 counts and > = 1.12 amplitude (see COLR)

Active only when OPRMs are ENABLED:
STP >= 29.5%
AND
Total Recirc Drive Flow < 60%
AND
Reactor Mode Switch in "RUN"

Front 32

PRNMS SCRAM
OPRM
·         Amplitude Based Algorithm (ABA)

Back 32

> = 1.30

Active only when OPRMs are ENABLED:
STP >= 29.5%
AND
Total Recirc Drive Flow < 60%
AND
Reactor Mode Switch in "RUN"

Front 33

PRNMS SCRAM
OPRM
·         Growth Rate Based Algorithm (GRBA)

Back 33

> =1.30

Active only when OPRMs are ENABLED:
STP >= 29.5%
AND
Total Recirc Drive Flow < 60%
AND
Reactor Mode Switch in "RUN"

Front 34

"PRNMS ROD WITHDRAWAL BLOCK
APRM Channel Trouble"

Back 34

< 3 LPRM detector input signals per axial level
< 20 total LPRM detector input signals to associated APRM channel
Any Critical or Non-Critical Self-Test Fault detected in the APRM or LPRM chassis
Loss of either of the redundant power supplies to the APRM channel (*AY185 or *BY185)

Front 35

PRNMS Alarms
OPRM Alarm
·         Period Based Detection Algorithm (PBDA)

Back 35

> = 14 counts

Active only when OPRMs are ENABLED:
STP >= 29.5%
AND
Total Recirc Drive Flow < 60%
AND
Reactor Mode Switch in "RUN"

Front 36

PRNMS Alarms
OPRM Alarm
·         Amplitude Based Algorithm (ABA)

Back 36

> = 1.20

Active only when OPRMs are ENABLED:
STP >= 29.5%
AND
Total Recirc Drive Flow < 60%
AND
Reactor Mode Switch in "RUN"

Front 37

PRNMS Alarms
OPRM Alarm
·         Growth Rate Based Algorithm (GRBA)

Back 37

> =1.20

Active only when OPRMs are ENABLED:
STP >= 29.5%
AND
Total Recirc Drive Flow < 60%
AND
Reactor Mode Switch in "RUN"

Front 38

RBM Rod Block Setpoint & when Active
LPSP

Back 38

> 121.5%

When STP% is above 28.1%
AND
Less then 63.1%

Front 39

RBM Rod Block Setpoint & when Active
IPSP

Back 39

> 116.5%

When STP% is above 63.1%
AND
Less then 83.1%

Front 40

RBM Rod Block Setpoint & when Active
LPSP

Back 40

>=111.0%

When STP% is above 83.1%

Front 41

RBM Rod Block Setpoint & when Active
Downscale

Back 41

< 5.0%

Front 42

RBM Rod Block Setpoint & when Active
INOP

Back 42

• RBM chassis INOP/OPER Keylock Switch in the “INOP” position
• Number of operating LPRM detectors is less than the required minimum and a control rod is selected
• More than one control rod is selected
• Loss of input power
• Critical self-test fault
• Firmware watchdog timer timed out