LOT 201.09 RHR

Question 1

• LOT 201.09 RHR*
• • *

What is the RCS C/D rate using RHR?

Answer 1

Assumption:

• CCW → RHR HX: 105 ˚F
• C/D started 4 hrs after Rx S/D

• 3 Trains:*
• *350 ˚F - 212 ˚F: 7 hrs**
• *350 ˚F - 150 ˚F: 12 hrs**
• 2 Trains:*
• *350 ˚F - 200 ˚F: 9 hrs**
• 1 Train:*
• *350 ˚F - 200 ˚F: 19 hrs**

Note:
During initital C/D, CCW intlet → RHR HX allowed to ↑ 120 ˚F for a max of 4 Hrs.

Question 2

• LOT 201.09 RHR*
• • *

What RHR components/indications are there on the ASP?

Answer 2

• *RHR Pump Suction Isolations**
• (MOV-060/MOV-061)*
• *RHR HX TCVs**
• (HCV-0864/0865/0866)*
• Loss of 7300 cabinet auto switches control to ASP*
• *RHR HX Bypass Flow (Manual Control)**
• (FCV-0851/0852/0853)*
• Loss of 7300 cabinet auto switches control to ASP*

RHR HX Flow

RHR HX Temp

Question 3

• LOT 201.09 RHR*
• • *

Which RHR trains are used to transfer refueling water from the refueling cavity to the RWST at the end of a refueling operation?

Answer 3

RHR Train “B”

RHR Train “C”

Flow is controlled by throttling the respective train IRC or ORC isolation valve to the RWST

Note:
Do not use train that is selected for shutdown cooling.

Question 4

• LOT 201.09 RHR*
• • *

What cools the RHR pump seals?

Answer 4

CCW

RHR pump may be ran w/o CCW if RCS Temp < 120 ˚F.

Question 5

• LOT 201.09 RHR*
• • *

What happens in the RHR system during a SI?

Answer 5

RHR HX Bypass Closes

RHR HX TCV Valve Full Open

RHR Pumps Trip

• *CCW from RHR HX opens**
• CCW pump mini-flow concerns*

Question 6

• LOT 201.09 RHR*
• • *

What trips the RHR pumps?

Answer 6

SI

RHR Flow - Low (925 gpm [5 sec TC])

CP001 Indications:

• Amps
• Flow

Question 7

• LOT 201.09 RHR*
• • *

When is RHR placed in service?

Answer 7

≤ 350 ˚F

• *≤ 332 psig**
• Interlock to open MOV-060/MOV-061*

No auto close features for MOV-060/MOV-061.

Question 8

• LOT 201.09 RHR*
• • *

Which pressure transmitters provide the open permissive for the RHR Suction Valves? (MOV-060/MOV-061)

Answer 8

• RHR Train “A”:*
• *MOV-060A: PT-405**
• *MOV-061A: PT-406**
• RHR Train “B”:*
• *MOV-060B: PT-406**
• *MOV-061B: PT-407**
• RHR Train “C”:*
• *MOV-060C: PT-407**
• *MOV-061C: PT-405**

Power Supplies:

• PT-405: Train “A”
• PT-406: Train “B”
• PT-407: Train “C”

Question 9

• LOT 201.09 RHR*
• • *

What keeps the RHR HX full of water?

Answer 9

RCP Seal Standpipe

RMW Makeup

RCP Makeup Line Pressure - Low (17 psig) will cause “RHR HX NOT FULL” alarm on CP001.

Note:
No actual level indication just makeup line pressure.

Question 10

• LOT 201.09 RHR*
• • *

Where in the CVCS does RHR enter and exit?

Answer 10

• Supply:*
• *Downstream of Regen HX (IRC)**
• RHR Train “A” AND Train “B”*
• Return:*
• *Upstream of VCT**
• RHR Train “A” ONLY*

Low Pressure Letdown:

• All letdown orifices open
• RHR pump not required to be running
• PCV-135 able to maintain ≈ 380 psig