Steam Bypass Control System

Question 1

Which systems does the Steam Bypass Control System work with?

Answer 1

Reactor Power Cutback System

Reactor Regulating System

Question 2

Purpose of the Steam Bypass Control System?

Answer 2

Dissipate excess energy

Question 3

Quick Open Block

Answer 3

Prevent the Steam Bypass Control Valves from quickly opening

Loss of Main Feedwater Pump

Question 4

Quick Open

Answer 4

~60% Reactor Power
~60% Steam Flow
Large Load Reject

Question 5

What conditions initiate a Large Load Reject?

Answer 5

Low Steam Flow (Decreasing Steam Flow)
Low TLI (Decreasing TLI)
High Pressurizer Pressure (increases Pressure)

Question 6

What is the purpose of the Reactor Power Cutback System?

Answer 6

Allow plant to remain online when it would have tripped by dropping specific control rods into the core and lower reactor power from 100%

Question 7

What all happens with a Loss of a Main Feedwater Pump?

Answer 7

Low Control Oil Signal
~60% reactor power (drop groups 4 and 5)
Turbine Setback (~60% steam flow)
Reactor Reg
Turbine Runback
Quick Open Block Signal

Question 8

What all happens with a Large Load Reject?

Answer 8

Quick Open Signal

AMI Threshold

Question 9

AMI Threshold

Answer 9

Ensure that Reactor Power is less than Steam Bypass Control System valve Availability with a Large Load Reject
Once reached an AMI is initiated