DECAY HEAT REMOVAL

Question 1

What is the maximum LPI flow rate from the BWST?

Answer 1

<3300 gpm

Question 2

What is the maximum LPI flow rate from the RB Sump?

Answer 2

<3000 gpm

Question 3

What is the maximum LPI flow rate with DH-V-38A/B OPEN?

Answer 3

2800 gpm

Question 4

What is the maximum LPI flow rate with RC-V-4 OPEN?

Answer 4

2700 gpm

Question 5

What is the LPI flow limit if ECCS sump level is below RB flood level?

Answer 5

<1500 gpm

Question 6

What is the maximum temperature for DHP pump bearings?

Answer 6

180°F

Question 7

What is the maximum temperature for DHP motor bearings?

Answer 7

190°F

Question 8

What is the maximum temperature for the DHP motor stator?

Answer 8

130°C

Question 9

What powers DH-V-1/2/3 valves?

Answer 9

1C ESV MCC

Question 10

What interlock prevents DH-V-1/2 from opening above 400#?

Answer 10

Prevents piping overpressurization

Question 11

When should DH-V-6A/B be opened?

Answer 11

When BWST is at 9.5’

Question 12

When should DH-V-5A/B be closed?

Answer 12

When BWST is at 6.33’ or RB >56”

Question 13

What valves are used to throttle LPI flow to minimize disc wear?

Answer 13

DH-V-19A/B globe valves

Question 14

Which valve is locked OPEN post-LOCA for boron precipitation?

Answer 14

DH-V-12B

Question 15

What is the preferred boron precipitation mitigation method within 24 hours?

Answer 15

Drain RCS through drop line to DH-P-1B (aligned to sump) with return via CF/LPI nozzles

Question 16

What is the secondary boron precipitation mitigation method after 5+ days?

Answer 16

Inject RB sump through Pzr Aux Spray line via DH-V-64

Question 17

What are the indications of DHP pump vortexing?

Answer 17

Oscillating motor current, pump discharge pressure, discharge flow, noise/vibration.

Question 18

What action should be taken if DHP pump vortexing is observed?

Answer 18

Increase level and place DHP in PTL.

Question 19

What is the piggyback procedure if BWST is <15’ and LPI flow is <1250gpm in each line?

Answer 19

OPEN DH-V-7A/B, keep MU-V-14s OPEN (checks seated) for alternate MUP source if DHP trips.

Question 20

What is the LCO if one BWST level transmitter is OOS?

Answer 20

72-hour LCO.

Question 21

What should be done if DHP cavitation is observed during sump recirculation (Guide 22)?

Answer 21

Throttle LPI to minimum (>1250 gpm), do NOT place DHP in PTL, and shutdown both BS trains.

Question 22

How long can DHPs operate on minimum recirculation without cooling?

Answer 22

No more than 10 minutes.

Question 23

At what level do BWST heaters have a low-level cutoff?

Answer 23

6.3 feet.

Question 24

What is the restriction for BWST heaters when the level is <3’?

Answer 24

Do NOT allow heaters to energize.

Question 25

What is the allowable delay for missing surveillance?

Answer 25

Up to 24 hours or the surveillance frequency, with a risk evaluation performed.

Question 26

Can Decay River pumps be removed from service if the outage just started with 20.5’ FTC level and EFW is INOP?

Answer 26

No, because the plant is not in refueling shutdown with >23 ft refueling canal level.