ILT 2027 > RN > Flashcards

RN Flashcards

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1
Q

What is the purpose or the RN system?

A

Provides assured cooling during normal and emergency conditions for all heat loads in the Auxiliary and Reactor Building except for the ice condenser (NF) system

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2
Q

RN supplies assured makeup to which systems?

A

NW
CA
KF
KC

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3
Q

How is RN aligned to the NW surge chamber?

A

Automatically following an St signal and a Low-Low level or Low-Low pressure in the NW surge tank.

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4
Q

How is RN aligned to the KF system?

A

Manually by procedure

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5
Q

How is RN aligned to the KC system?

A

Manually by procedure

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6
Q

How is RN aligned to the CA system?

A

Automatically after a CA AutoStart and a low suction condition exist, and CA valve control has not been reset.

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7
Q

Where can the RN pits get water from?

A

-Lake Wylie
-SNSWP (standby Nuclear Service Water Pond)

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8
Q

What is the Ultimate Heat Sink for the RN system?

A

SNSWP

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9
Q

Per LCO 3.7.9 Standby Nuclear Service Water Pond (SNSWP) at what level does the SNSWP become inoperable?

A

< than or equal to 571 ft mean sea level

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10
Q

What is the mode of applicability for LCO 3.7.9 Standby Nuclear Service Water Pond (SNSWP)?

A

MODES 1, 2, 3, and 4.

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11
Q

Per LCO 3.7.9 Standby Nuclear Service Water Pond (SNSWP) at what temperature does the SNSWP become inoperable?

A

less than or equal to 95 degrees at an elevation of 568 ft.
**Only required to be performed during the months of July,
August, and September.

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12
Q

Per SLC 16.9-14 (Lake Wylie Water Temperature) at what Lake Wylie temperature are the required actions entered when RN is aligned to Lake Wylie?

A

> than 95.5 degrees.

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13
Q

Per SLC 16.9-14 (Lake Wylie Water Temperature) what are the required actions when RN is aligned to Lake Wylie and Lake Wylie is > 95.5 degrees?

A

Immediately align at least one NSWS loop to the Standby Nuclear Service Water Pond (SNSWP).
**Only required to be performed during July, August, and
September while the NSWS is aligned to Lake Wylie

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14
Q

What will automatically start an RN pump?

A

-Safety Injection (Ss) on either Unit starts all 4 RN pumps.
-Either Unit Train related Blackout starts the associated train RN pumps (i.e. A Unit 1 Train A Blackout signal starts the 1A and 2A RN Pumps.)
-Emergency Low Level in Pit A or Pit B starts all 4 RN pumps. Pumps can be stopped at any time after the Emergency low level occurs

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15
Q

What is the maximum RN pump flow?

A

25,800 gpm
**During pump manipulations, this max flow rate may be exceeded until the RN System stabilizes

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16
Q

What is the minimum RN pump flow for continuous operation?

A

8600 gpm

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17
Q

What is the lowest flow for an RN pump and how long can it operate there?

A

4000 gpm
*** Flowrates between 4000 gpm and 8600 gpm are allowable for up to 2 hours in a 10 hour period

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18
Q

Per limits and precautions op OP/0/A/6400/006 C (Nuclear Service Water System) where is it preferred that RN flow be maintained at?

A

Greater than or equal to 10,000 gpm
The RN outlet flow through the idle KC Heat Exchanger is controlled to maintain

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19
Q

If the KC HX OTLT Mode switch is in the “Mini Flow” position, what RN flow does RN-291/RN-351 tried to maintain?

A

Approximately 19,000 gpm for each operating RN pump

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20
Q

Per limits and precautions op OP/0/A/6400/006 C (Nuclear Service Water System) what sequence is recommend to relieve an RN Pump low flow condition?

A
  1. Secure excess RN Pump(s)
  2. Initiate manual RN Strainer backwash on non-affected RN Pump(s).
  3. Establish flow through the RN Crossover Flush Header.
  4. Establish flow through NS Heat Exchanger(s)
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21
Q

What valves will automatically open when an RN pump is started and close when the RN pump is secured?

A

-The RN Pumps’ Cooler Inlet Isolation valves (RN-11A/RN-20B)
-The RN Pumps’ Discharge valves (RN-28A /RN-38B)

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22
Q

What is the limit for RN flow through an NS HX and what is the reason for the limit?

A

Less than or equal to 4650 gpm to prevent flow induced vibration problems in the NS Hxs

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23
Q

What signals will close the pumphouse isolation valves from Lake Wylie (1RN-1 A and 1RN-2B (Pit A) and 1RN-5A and 1RN-6B (Pit B))?

A

-Train A or Train B Emergency Low Pit Level (557.5 ft)
-Unit 1 ASP to LOCAL control (train-related): All 4 valves are affected by transfer of Unit 1 ASPs. 1RN-1A and 1RN-6B require train-related RN pump running in order to CLOSE valve on transfer.

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24
Q

What signals will open the pumphouse isolation valves from the SNSWP (1RN-3A (A Pit) and 1RN-4B (B Pit))?

A

-Train A or Train B Pit Emergency Low Pit Level (557.5 ft)
-Unit 1 Train-related ASP to LOCAL control: Both valves are affected by transfer of Unit 1 ASPs. Train-related RN Pump must be running in order to open valve on transfer.

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25
How long will it be before the RN suctions from lake Wylie and SNSWP can be operated from the control boards following an Emergency Low Pit level alarm?
2 minutes
26
Is automatic strainer backwash capability or continuous backwash required for the associated RN pump to be OPERABLE?
Yes
27
When do the D/G Engine Jacket Water Cooler Isolation Valves, RN-232A and 292B open?
Interlocked to open upon the start of its respective diesel
27
How does a safety injection signal affect the RN Chemical Addition Dilution Water Isolation valves 1RN-36A and 1RN-37B?
1RN-36A and 1RN-37B automatically close on a Safety Injection Signal.
28
What signal will close the RN Supply X-over Isolation Valves RN-47A and 48B?
Each valve closes upon an "SP" (Phase B) Isolation signal from its respective Unit and train. -Pit A Emergency Low Level will close 1 and 2 RN-48B -Pit B Emergency Low Level will close 1 and 2 RN-47A
29
What signal will open the KC Heat Exchanger Inlet Isolation Valves RN-287A and 347B?
Unit/Train related ASP to "LOCAL" if an associated train KC pump is running.
30
What two modes can the KC Heat Exchanger Outlet Throttle Valves RN-291 and 351 can be operated in?
-KC TEMP Mode -MINIFLOW
31
If the KC Heat Exchanger Outlet Throttle Valves RN-291 and 351 are in KC TEMP mode, what temperature does it control for?
87 degrees F.
32
What signals will fail open the KC Heat Exchanger Outlet Throttle Valves RN-291 and 351?
-Loss of Instrument Air (VI) -SS (Safety Injection) signal (Faulted unit only) -Unit/Train related ASP to LOCAL position
33
What occurs if EMF-45A/EMF-45B (A/B TRAIN RN MONITOR) goes into trip 2 condition?
Annunciator only
34
What signals close the Non Essential Supply and Return Header Isolation valves 1(2) RN-49A, 50B, 51A, 52B?
Close on a Unit related Phase B (SP) signal. -RN-49A and 50B also close on an RN pit emergency low level.
35
What components are on the non-essential header?
-Auxiliary Building Supply Vent Units (2 per Unit) -Upper Containment Vent Units (4 per Unit) -Lower Containment Vent Units (4 per Unit) -Incore Instrumentation Room Vent Units (2 per Unit) -Reactor Coolant Pump Motor Coolers (4 per Unit)
36
What system normally supplies cooling water to the RN Non-Essential Header?
YV System
37
Where does the RN system normally discharge to?
RL System discharge lines to Lake Wylie
38
Where can the RN system discharge to?
-RL System discharge lines to Lake Wylie -SNSWP
39
What is the interlock between the Diesel Generator Return Isolation Valves to Lake Wylie RN-847A and 849B and the SNSWP D/G Return Valves, RN- 846A and 848B?
One of the discharge paths has to be open.
40
What signals close the Diesel Generator Return Isolation Valves to Lake Wylie RN-847A and 849B?
-Emergency Low Level in either RN Pumphouse pit -Unit/Train related ASP to LOCAL
41
What signals close the RL Return Line Isolation Valves, 1RN-57A and 1RN-843B?
-Emergency Low Level in either RN Pumphouse pit. -Unit 1 Train related ASP to LOCAL - 1RN-57A only closes with a Train-related Pump Operating and 1A ASP to LOCAL
42
What signals open the SNSWP Return Isolation Valves 1RN-63A and 1RN-58B?
-A Phase B (Sp) signal from either unit -Emergency low level in either RN Pumphouse pit. -Unit 1 Train related ASP to "LOCAL"
43
What signals close the RN Return Header Crossover Isolation Valves, 1RN-54A and 1RN-53B?
-Emergency low level in either RN Pumphouse pit -Unit 1 Train related ASP to "LOCAL" - 1RN-53B only closes with a Train-related Pump Operating and 1B ASP to LOCAL
44
What signals will cause an automatic swap to the SNSWP?
-2 out of 3 Emergency Low level in either RN pit (557.5) -Loss of 1ERPA(D) Loss of 2ERPA(D) does not cause a swap to the SNSWP because it they only power 1 pit level.
45
What signal will cause RN to automatically supply the RN Non-Essential Header?
Loss of two of more of the YV MCCs (MXI, MXE, and MXL) - the following will occur after a 5 minute time delay
46
If the 3 Position switch “YV/RN Cool Water Mode" is taken to the RN position what will occur?
The RN supply and return valves open and the YV supply and return valves close with NO time delay
47
What is required for the "YV OPERABLE" light to be lit?
-YV supply and return valves open -YV supply temperature less than 54 degrees F -YV supply pressure is greater than 40 psig
48
What is required for the "RN OPERABLE" light to be lit?
The RN supply and return valves are open.
49
In order for RN to swap and supply the RN Non-Essential Header, what position must the two switches on the control board be in?
The “YV/RN Cool Water Ctrl” must be in control room position The “YV/RN Cool Water Mode” must be in Auto
50
What are the power supplies to the YV Chillers?
-YV Chiller 1: TA (long side) -YV Chiller 2: TB (long side) -YV Chiller 3: TC (long side)
51
What is normal RN pump discharge pressure?
Normal discharge pressure for the operating RN pump is 60 to 65 psig, with one pump running and 70 to 75 psig with two pumps running.
52
Can an RN strainer make an RN pump inoperable?
Yes, When a RN strainer is isolated, the associated RN pump is inoperable and unavailable If a strainer backwash motor is out-of-service, then backwash capability is lost for that strainer and the associated RN pump is inoperable, but available.
53
What is the required action if One Nuclear Service Water Suction Transfer Low Pit Level channel in one or more pits inoperable Per LCO 3.3.2 function 10 (Nuclear Service Water Suction Transfer - Low Pit Level)?
Within 4 hours Place channel in trip. OR Within 4 hours Align the Nuclear Service Water System for Standby Nuclear Service Water Pond recirculation.
54
What is the required action if Two Nuclear Service Water Suction Transfer Low Pit Level channel in one or more pits inoperable Per LCO 3.3.2 function 10 (Nuclear Service Water Suction Transfer - Low Pit Level)?
Within 4 hours Align the Nuclear Service Water System for Standby Nuclear Service Water Pond recirculation.
55
What is the RN system Mission time?
30 days
56
Per SLC 16.7-6 RN Discharge Instrumentation, what are the required actions if Annunciator 2AD12-A/4 RN Pump B Flow Hi/Lo is non-functional?
Immediately Ensure associated RN pump(s) are not in service. OR Immediately Align affected RN loop(s) discharge(s) to Standby Nuclear Service Water Pond (SNSWP)
57
During both normal and emergency plant operation, how many VZ safety related fans per pump compartment can operate?
one
58
What signal will start a VZ fan?
A sequencer signal from either unit will start one safety related VZ fan in each pumphouse, unless one fan was already running in which case it will continue to run.
59
What are the ambient temperature limits within the nuclear service water pump structure?
-maximum 115°F -minimum 35°F
60
What are the positions on the YV/RN Cool Water Mode switch?
AUTO – Allow Auto-Swap to occur YV – YV supplies loads RN – RN supplies loads
61
What are the positions on the YV/RN Cool Water CTRL switch
LOCAL – Supply/Return valves controlled from CME Building Blocks Auto-Swap CTRL RM – Supply/Return valves controlled from C/R Allows Auto-Swap
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