Systems Exam 2 - Reactor Makeup

Question 1

What powers u-8104 (Emergency Borate Valve)?

Answer 1

→uEB4-1
→Controlled by either MCB or RSP
→no automatic functions

Question 2

What happens to RMUW on SI?

Answer 2

→VCT outlet valves close after RWST to CCP valves open
→RMUW Pumps stop until SIS or BOS OL clears, restart after ~130 seconds
→Normal heat trace panels load shed

Question 3

Per the TRM, heat tracing must maintain temperature

Answer 3

Per TRM must maintain piping >65°F

Question 4

Does FCV-110A fail open or closed?

Answer 4

Fail Open AOV (continue to manual emergency borate)

Question 5

Control Modes

Answer 5

1. Off
2. Auto
3. Borate
4. Dilute
5. Alternate Dilute
6. Manual

NOTE: control relays powered from PC1, on loss of PC1 system can be manually operated to provide makeup flow.

Question 6

How does AUTO makeup work?

Answer 6

→makeup starts at 46% VCT level
→makeup stops at 56% VCT level
→total max flow 127 gpm (max in auto)
→aligned to VCT outlet

Question 7

BAT Tanks

Answer 7

→Useable vol 43,000 gals
→TRM min concentration of 7,000 ppm
→TRM minimum temperature of 65°F
→Room heaters set at 90°F
→Remote and local level and temperature indication, remote indication on U1 only

Question 8

Boric Acid Transfer Pump power supplies and flow

Answer 8

→X-01: uEB1-1
→X-02: uEB4-1
→75 gpm @ 100 psig
→can be controlled at RSP; no auto position on RSP

Question 9

How are FK-111 and FK-110 maintained? Auto vs. manual.

Answer 9

→FK-111 and FK-110 maintained in manual
→swap to auto when an auto makeup occurs
→if manual pushbutton is pushed, it will seal in and prevent swap to auto
→to remove the seal-in, push the auto pushbutton

Question 10

Pot settings and max flow for FK-110

Answer 10

→FK-110 is 10 turn pot to control flow 0-40 gpm
→controls flow from BATs
→27 gpm considered maximum flow
→pot setting is desired flow/4

Question 11

Pot settings and max flow for 111

Answer 11

→FK-111 is 10 turn pot to control flow 0-160 gpm
→controls makeup flow through blender (RMUW + BA)
→127 gpm hard setpoint for AUTO overrides pot setting
→pot setting is desired flow/16

Question 12

BA Flow Deviation Alarm

Answer 12

Desired flow is not obtained within ±1 gpm within 25 seconds. If occurs, it closes FCV-110B and FCV-111B.

Question 13

When a blended flow of a concentration >1600 ppm is desired…

Answer 13

the maximum boric acid flow should NOT be expected to exceed 27 gpm. Therefore, a Manual Blended Makeup is required to achieve boron concentration >1600 ppm.

Question 14

Emergency Boration Flowpaths

Preferred Emergency Boration

Answer 14

→BAT to BA transfer pump, through u-8104 to suction of CCPs
→75 gpm

Question 15

Emergency Boration Flowpaths

Manual Emergency Boration

Answer 15

→BAT to BA transfer pump, through FCV-110A, through uCS-8439 to suction of CCPs
→36 gpm

Question 16

Emergency Boration Flowpaths

Gravity Feed Emergency Boration

Answer 16

→gravity feed from BAT through u-8509 to suction of CCPs

Question 17

Emergency Boration Flowpaths

Alternate Emergency Boration

Answer 17

→BAT to BA transfer pump, through FCV-110A, through blender, through FCV-110B to suction of CCPs
→27 gpm

Question 18

BAT and RWST min level (MODES 1-4)

Answer 18

→BAT must be >50%
→RWST must be >95%
→per TR 13.1.31

Question 19

RMUW Flo Deviation Alarm

Answer 19

Desired flow is not obtained within ± 8 gpm within 25 seconds. If occurs closes FCV-110B and FCV-111B.

(FCV-111B should already be closed in this case since any flow with boron is directed to the bottom of the VCT.)

Question 20

TR 13.1.31 Boron Injection System Operating (MODES 1-4)

Answer 20

Two OPERABLE paths (2 out of the 3 paths below):
→1 BAT, BA transfer pump or Gravity Feed & CCP
→RWST, Train A RWST Valve, Train A CCP
→RWST, Train B RWST Valve, Train B CCP

Note: Mode 4 - PDP can be sued in place of CCP

Question 21

TR 13.1.32 Boron Injection Systems Shutdown (MODES 5-6)

Answer 21

One OPERABLE path

If using RWST as borated water source in Modes 5 & 6, required to be operable with:
→minimum level of 24% (15% in Mode 6 with head removed and SIP injection path)
→minimum boron concentration of 2400 ppm
→minimum solution temperature of 40° F

Question 22

The chem add lineup has an orifice to limit chem add flow to…

Answer 22

→2 gpm
→Used to add chemicals for pH control and O2 scavenging
→RMUW pumps provide driving force

Question 23

Per ABN-107, Attachment 7, for stuck control rods…

Answer 23

…borate 1800 gallons of 7000 ppm boric acid OR equivalent for EACH control rod not fully inserted.

Question 24

Which dilution control mode gives the quickest reactivity response?

Answer 24

alternate dilute
(can be aligned to bottom of VCT)

Question 25

How do you calculate boric acid flow for blended flow?

Answer 25

BA Flow x BAT conc = TOTAL Flow x RCS conc