LOT 201.02 RCS

Question 1

• LOT 201.02 RCS*
• • *

What is the purpose of the thermal sleeve on the PZR surge line?

Answer 1

Allows stagnant layer of water between piping and welds

Insulates the welds allowing them to heat up at a slower rate and thus reduces stresses

Question 2

• LOT 201.02 RCS*
• • *

What is K_eff, RTP, and T_avg when the plant is in MODE 2?

Answer 2

Startup:

• Keff:*
• *≥ 0.99**
• RTP:*
• *≤ 5%**
• T_avg:*
• *≥ 350 ˚F**

Question 3

• LOT 201.02 RCS*
• • *

What are the piping penetrations off the hot legs?

Answer 3

• Loop 1:*
• *RHR “A” Suction**
• *SI “A” Recirc**
• *Sampling**
• Loop 2:*
• *RHR “B” Suction**
• *SI “B” Recirc**
• Loop 3:*
• *RHR “C” Suction**
• *SI “C” Recirc**
• *Sampling**
• Loop 4:*
• *PZR Surge Line**

Question 4

• LOT 201.02 RCS*
• • *

What are the piping penetrations off the cold legs?

Answer 4

• Loop 1:*
• *PZR Spray**
• *SI Train “A” Injection** / RHR “A” Return
• Same Penetration*
• *Normal Charging**
• Loop 2:*
• *SI Train “B” Injection** / RHR “B” Return
• Same Penetration*
• Loop 3:*
• *SI Train “C” Injection** / RHR “C” Return
• Same Penetration*
• *CVCS Alternate Charging**
• Loop 4:*
• *PZR Spray**

Question 5

• LOT 201.02 RCS*
• • *

What is K_eff, RTP, and T_avg when the plant is in MODE 6?

Answer 5

Refueling:

• Keff:*
• *≤ 0.95**
• RTP:*
• *0%**
• T_avg:*
• *≤ 140 ˚F**

Fuel in the Rx vessel w/ vessel closure bolts less than fully tensioned or head removed.

Question 6

• LOT 201.02 RCS*
• • *

What is K_eff, RTP, and T_avg when the plant is in MODE 1?

Answer 6

Power Operation:

• Keff:*
• *≥ 0.99**
• RTP:*
• *> 5%**
• T_avg:*
• *≥ 350 ˚F**

Question 7

• LOT 201.02 RCS*
• • *

What size are the pipes in the RCS?

Answer 7

• Cold Leg:*
• *27.5”**
• Hot Leg:*
• *29”**
• Intermediate Leg:*
• *31”**

Inside Diameter of pipes.

Question 8

• LOT 201.02 RCS*
• • *

How many NR hot leg and NR cold leg temperature instruments are there in each loop of the RCS?

Answer 8

• *3 Hot Legs**
• Located 120˚ apart for stratification purposes*
• *1 Cold Leg**
• Located downstream of RCPs (Stratification not a concern)*

Feed into T_avg and ∆T.

Question 9

• LOT 201.02 RCS*
• • *

What is K_eff, RTP, and T_avg when the plant is in MODE 3?

Answer 9

Hot Standby:

• Keff:*
• *< 0.99**
• RTP:*
• *0%**
• T_avg:*
• *≥ 350 ˚F**

Question 10

• LOT 201.02 RCS*
• • *

What would Loop 1 RCS flow indicate if the high pressure tap on loop 1 ruptures?

Answer 10

All loop flows in that loop fail to zero

Loop flow consists of 1 High Pressure (Outside of elbow) and 3 Low Pressure (Inside of elbow).

↓∆P = ↓HP - LP → Flow ↓

Note:
Rupture of a Low pressure tap would result in Flow failing high on 1 of 3 flow instruments.

Question 11

• LOT 201.02 RCS*
• • *

What are the piping penetrations off the intermediate legs?

Answer 11

• Loop 1:*
• *Drain to RCDT**
• Loop 2:*
• *Drain to RCDT**
• Loop 3:*
• *Drain to RCDT**
• *CVCS Letdown**
• Loop 4:*
• *Drain to RCDT**
• *CVCS Excess Letdown**

Loop drains go to suction of RCDT pumps. Do NOT go directly to RCDT.

• Note:*
• Flange leakoff goes directly to RCDT.*

Question 12

• LOT 201.02 RCS*
• • *

What are the design parameters of the RCS?

• Flowrate
• RTP
• T_avg
• Pressure

Answer 12

• Flowrate:*
• *107,800 gpm / RCP**
• RTP:*
• *3853 MWt**
• T_avg:*
• *567 ˚F - 593 ˚F**
• 0% - 100%*
• Pressure:*
• *2485 psig**
• NOP: 2235 ± 15 psig*

Actual T_avg @ 100% is 592 ˚F

Question 13

• LOT 201.02 RCS*
• • *

What is K_eff, RTP, and T_avg when the plant is in MODE 4?

Answer 13

Hot Shutdown:

• Keff:*
• *< 0.99**
• RTP:*
• *0%**
• T_avg:*
• *350 ˚F > T_avg > 200 ˚F**

Question 14

• LOT 201.02 RCS*
• • *

What is K_eff, RTP, and T_avg when the plant is in MODE 5?

Answer 14

Cold Shutdown:

• Keff:*
• *< 0.99**
• RTP:*
• *0%**
• T_avg:*
• *≤ 200 ˚F**