Steam Dumps

Question 1

What temperature is T No Load?

Answer 1

547*F

Question 2

What is Lo-Lo Tave?

Answer 2

541*F

Question 3

How many groups of dumps will actuate on Turbine Trip?

Answer 3

2 groups, 6 valves

Question 4

What is C-7A?

Answer 4

Arming Signal

10% Step Load Change

5% / minute change

Question 5

What is C-7B?

Answer 5

Arming Signal

30% Step Load Change

Question 6

What is C-8?

Answer 6

Turbine Trip Arming Signal

4/4 Main Turbine Stop Valves Closed
OR
2/3 oil Pressure switches below 800#

Question 7

What is C-9?

Answer 7

Blocking Signal

1. CW Pump Breaker Closed
2. CRID 2 Energized
3. 3/3 Condenser Vacuums > 20.6” Hg

Question 8

What is P-12?

Answer 8

Blocking Signal

2/4 Tavg < 541*F

Question 9

Which CRID has no Steam Dump Loads?

Answer 9

CRID 3

Question 10

What is the input to Tref?

Answer 10

MPC-253

Question 11

What is the input to the arming signals?

Answer 11

MPC-254

Question 12

When do you get all 3 groups of steam dumps?

Answer 12

30% load rejection

Question 13

What groups are available on a 10% Load Rejection?

Answer 13

Groups 1 and 2

Question 14

What steam dump mode must you be in to cool down below 541*F?

Answer 14

Steam Pressure mode if P-12 Bypass

Question 15

What does P-12 prevent?

Answer 15

Excess Cool down

Question 16

The steam dump system is designed to accept steam flow equivalent to _____% of full power

Answer 16

40%

Question 17

How low can you cool down on a normal Turbine Trip?

Answer 17

T no load

547*F

Question 18

If a Auctioneered High T avg instrument fails high, and you get a turbine trip, how low will you cool down?

Answer 18

541*F

P-12 stops you

Question 19

Are steam dumps safety related?

Answer 19

NO

Question 20

What are the turbine trip and load rejection controllers based on?

Answer 20

Auctioneered High Tave

Question 21

How many groups of steam dumps are available in Steam pressure mode?

Answer 21

Group 1 And 2 (if above 541*F)

You can Bypass P-12 to get 1 group of dumps to cool down below 541*F

You must JUMPER to get a second group

Question 22

MPC-253 fails high. Half hour later, Rx trip and no operator action. A few mins following the trip, what will RCS Tavg be?

Answer 22

547*F

Question 23

What is the input to the Steam Dump Turbine Trip Controller?

Answer 23

Auctioneered High Tave

Question 24

What is the temperature input to the Load Rejection Controller?

Answer 24

MPC-253 (Tref)

Question 25

What is the input for Steam Dump Steam Pressure Controller?

Answer 25

UPC-101