Reactor Level Setpoints/Actuations and Basis

Question 1

What functions occur at Level 8(219”)?

Answer 1

1) Reactor Scram 2) Main Turbine trips 3) Reactor Feed Pump Turbines trip 4) Motor Feed Pump trips 5) HPCS Injection Valve, E22-F004, closes 6) RCIC Steam Isolation valve, E51-F045, closes

Question 2

What function occurs at Level 7(205”)?

Answer 2

High level alarm

Question 3

What function occurs at Level 5(201”)?

Answer 3

Normal operating band

Question 4

What functions occur at Level 4(197”)?

Answer 4

1) Low level alarm 2) Reactor Recirc FCV runback coincident with a RFPT trip to 17% valve position equal to 48 Mlbm/hr.

Question 5

What functions occur at Level 3(178”)?

Answer 5

1) Reactor Scram 2) Reactor Recirc Pumps shift to slow speed 3) RHR Shutdown Cooling isolates(NS4) 4) ADS confirmatory signal 5) Setpoint Setdown activated

Question 6

What functions occur at Level 2(130”)?

Answer 6

1) HPCS starts 2) RCIC starts 3) Division 3 Diesel starts 4) NS4 BOP Isolation 5) Reactor Recirc Pumps trip off 6) RWCU isolates

Question 7

What is the basis for the Level 8 Reactor Scram? What instrument range is utilized?

Answer 7

1) Stop positive reactivity addition to the Reactor 2) Narrow Range

Question 8

What is the basis for the Level 8 Main Turbine Trip? What instrument range is utilized?

Answer 8

1) Avoid carryover and damage to the Main Turbine 2) Narrow Range

Question 9

What is the basis for the Level 8 Reactor Feed Pump Turbine and Motor Feed Pump trip? What instrument range is utilized?

Answer 9

1) Avoid overfeeding the vessel 2) Narrow Range

Question 10

What is the basis for the Level 8 closure of the HPCS Injection Valve, E22-F004? What instrument range is utilized?

Answer 10

1) Avoid overfeeding the vessel 2) Narrow Range

Question 11

What is the basis for the Level 8 closure of the RCIC Steam Isolation Valve, E51-F045? What instrument range is utilized?

Answer 11

1) Avoid overfeeding the vessel 2) Narrow Range/Wide Range

Question 12

What is the basis for the Level 7 annunciator? What instrument range is utilized?

Answer 12

1) Alert the operator of a problem 2) Narrow Range

Question 13

What is the basis for the Level 5 normal operating band? What instrument range is utilized?

Answer 13

1) The normal operating band prevents carryover/carryunder 2) The normal band provides adequate NPSH for the Reactor Recirc Pumps 3) Narrow Range

Question 14

What is the basis for the Level 4 annunciator? What instrument range is utilized?

Answer 14

1) Alerts the operator of a problem 2) Narrow Range

Question 15

What is the basis for the Level 4 Reactor Recirc Flow Control Valve Runback concurrent with a RFPT trip? What instrument range is utilized?

Answer 15

1) Reduce reactor power to allow the running RFPT to handle the feed demand 2) Narrow Range

Question 16

What is the basis for the Level 3 Reactor Scram? What instrument range is utilized?

Answer 16

1) Avoid carryunder 2) Narrow Range

Question 17

What is the basis for the Level 3 Reactor Recirc Pump Downshift? What instrument range is utilized?

Answer 17

1) Low NPSH for the Reactor Recirc Pumps 2) Narrow Range

Question 18

What is the basis for the Level 3 RHR Shutdown Cooling Isolation? What instrument range is utilized?

Answer 18

1) Isolates possible source of leakage 2) Narrow Range

Question 19

What is the basis for the Level 3 ADS confirmatory signal? What instrument range is utilized?

Answer 19

1) Allows Level 1 signal to actuate ADS 2) Narrow Range

Question 20

What is the basis for the Level 3 Setpoint Setdown activation? What instrument range is utilized?

Answer 20

1) Setpoint Setdown activates at Level 3 to lower the level setpoint to prevent overfeeding the vessel reestablishing level 2) Narrow Range

Question 21

What is the basis for the Level 2 HPCS and RCIC initiation? What instrument range is utilized?

Answer 21

1) Recover vessel inventory prior to Level 1 2) Wide Range

Question 22

What is the basis for the Level 2 Division 3 Diesel Generator start? What instrument range is utilized?

Answer 22

1) Division 3 Diesel is started in preparation for loading the bus 2) Wide Range

Question 23

What is the basis for the Level 2 NS4 BOP isolation? What instrument range is utilized?

Answer 23

1) Anticipates a possible LOCA 2) Wide Range

Question 24

What is the basis for the Level 2 trip of Reactor Recirc pumps? What instrument range is utilized?

Answer 24

1) Inserts negative reactivity for an ATWS 2) Wide Range

Question 25

What is the basis for the Level 2 isolation of RWCU? What instrument range is utilized?

Answer 25

1) Isolates a possible source of leakage 2) Wide Range