PZR transmitters

Question 1

LT-460 controls?

Answer 1

14.4% cuts off heaters in auto or on, shuts LCV-460A/B

Question 2

LT-459 controls?

Answer 2

1. Charging pump speed based on PZR lvl
2. Gives HI an LO lvl alarms +/-5% from program
3. +5% level turns on B/U heaters anticipating insurge
4. 14.4% cuts off heaters in auto, also shuts LCV-460A/B

Question 3

LT-461 controls?

Answer 3

Can be selected to perfrom either LT-459 or LT-460 functions

Question 4

Level in pressurizer compared to power and temp

Answer 4

0% power - 22.2% lvl - 547°F Tavg
100% power - 53.3%lvl - 575.9°F Tavg

Question 5

LT-459/460/461
High Level Alarm

Answer 5

High Level trip 2/3
91% above P7
If one detector sees this then alarm in control room

Question 6

How many protection channels and what are they?

Answer 6

PT-455/456/457

Question 7

How many Control channels?

Answer 7

PT-444/445

Question 8

PT-455/456/457 do what at what pressures?

Answer 8

2376 - Hi pressure Rx trip
2000 - Allows blocking of low Pressure SI, auto unblocks, closes PORVs when in auto
1844 - Low pressure Rx trip
1715 - SI signal

all 2/3

Question 9

PT-444 does what?

Answer 9

1. Provides Pressure indicatino on RTGB and MDAFW room
2. Signals to PC-444J
3. Opens PCV-455C (PORV @ 2340)

Question 10

PT-445 does what?

Answer 10

1. PZR Hi and Lo alarm (2310/2185)
2. Opens PCV-456 ( PORV @ 2335)
3. Indication on RTGB