PZR PLCS

Question 1

State transients PPLC is designed to handle

Answer 1

Loading or unloading at 5% per min with auto rod control
Step load increase or decrease of 10% WITH auto rod control
Step load reduction of 50% WITH auto rod control and steam dump

Question 2

State power supplies for PZR Pressure Channels

Answer 2

PT-455: PP-1A
PT-456: PP-1B
PT-457: PP-1C
PT-458: PP-1D

Question 3

State power supplies for PZR Level Channels

Answer 3

LT-459: PP-1A
LT-460: PP-1B
LT-461: PP-1C

Question 4

State RX trip on PZR Level

Answer 4

92% 2/3

interlocked with p-7

Question 5

State RX trip on PZR low pressure

Answer 5

1945 2/4

interlocked with p-7

Question 6

State RX trip on PZR high pressure

Answer 6

2385 2/4

Question 7

State PZR level controlling channel and outputs

Answer 7

LT-459 or LT-461
feeds master level controller, low PZR level HTR cutout, low level alarm, LCV-459 and CS-V-145 closing signal, level deviation alarm

Question 8

State PZR level back up channel and outputs

Answer 8

LT-460 or LT-461

Feeds: PZR HTS low level cutoff, Low level alarm, LCV-460 and CS-V-145 closing signal, high PZR level alarm

Question 9

How does CS-FC-121 respond when charging flow is required to decrease

Answer 9

FC-121 is clipped at 42% minimum for seal flow

Question 10

State how PZR system responds on a High failure of a selected Level control channel (459,461)

Answer 10

Charging flow decreases to minimum, (FC-121 clips at 40%)
Back up heaters energize due to 5% deviation
Actual level drops
Pressure drops slightly
All heaters deenergize and LTDN isolates
PZR level will slowly rise
RX trips on high PZR level (92%)
PZR level decreases as Tave decreases
Plant pressure will will oscillate on the PORVs

Question 11

State how PZR system responds on Low failure of a selected Level control Channel (459, 461)

Answer 11

Charging increase to Max
All heaters deenergize
Letdown isolates
High PZR level trips RX (92%)
PZR level decreases as Tave decreases to no-load value
PZR level increases until water solid
Plant pressure will oscillate on the PORVs

Question 12

Discuss how auto pressure level control works

Answer 12

Average Tave provides input for 0% to 100% PZR level
0% power: 25% PZR level @ 557F
100% power: 50% PZR level @ 589.1F
Actual level is comparted to programed and error developed
FK-121 control output to FCV-121 to change flow

Question 13

State output of master pressure controller

Answer 13

A PORV
Both spray valves
Control Heaters and Back up heaters
Lo and Hi Pressure alarms

Question 14

State PZR Master pressure controller main pressure instruments

Answer 14

PT-455 (normal) or PT-457

Question 15

State PZR master pressure controller back up pressure instrument

Answer 15

PT-456 (normal) or PT-458

Question 16

State how PZR heaters respond on a LOP

Answer 16

Back up groups A and B are from US-52/62
No auto on until EPS is deactivated
Can operate manually after RMO is reset

Question 17

Discuss how spray valves operate

Answer 17

Start to open at 57%
Full open at 71%
Controlled from their own M/A station or master pressure controller

Question 18

State set points for PORVs and block valves

Answer 18

PORVs armed: 2335# - PT-458/457
Block valves open: 2350# - PT-458/457
PORVs open: 2385# - PT-455/456
ABBA
OOAA

Question 19

Discuss A train LTOP inputs

Answer 19

A-HOT-405
A train takes input from Auctioneered low WR Th and PT-405
Arming signal is from WR Tc

Question 20

Discuss B train LTOP inputs

Answer 20

B-COLD-403
B train takes input from Auctioneered low WR Tc and PT-403
Arming signal is from WR Th