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Catawba Nuclear Station > Monitor Tank Building(MTB) > Flashcards

Monitor Tank Building(MTB) Flashcards

1
Q

What is the purpose of the Monitor Tank Building(MTB)?

A

The purpose of the Monitor Tank Building is to provide an additional facility with greater capacity to process liquid radioactive waste

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2
Q

What are the three events that the Monitor Tank Building is designed to handle?

A
  1. 50gpm(average) Turbine Building Sump input during a primary to secondary leak
  2. 50gpm leak in the Auxiliary Building coinciding with a 50gpm seal failure on an ND or NS pump
  3. Boron Recycle Evaporator failure concurrent with expected input into the Recycle Holdup Tanks from either:
    A. Refueling outage activities
    B. Unit startup activities
    C. Power ascension activities following a forced power reduction
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3
Q

What is unique about the design of the MTB Process Area?

A

The process area was constructed using a seismic bathtub design to ensure that any radioactive liquid being processed in the building would be contained if a catastrophic failure were to occur

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4
Q

What is the design/purpose of the Auxiliary Monitoring Tanks?

A
  1. 3 stainless steel tanks, each 20,000 gallons
  2. Have an agitator
  3. Receive processed waste water for storage or further processing
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5
Q

What is the discharge path for the Auxiliary Monitoring Tanks?

A

The AMTs discharge to the RL system through EMF-57

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6
Q

How many Auxiliary Monitoring Tank Pumps are there, what will cause them to automatically trip?

A
  1. There is one pump for each AMT

2. The pumps will trip on AMT low level, approximately 2%

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7
Q

How many Auxiliary Monitoring Tanks are normally in service?

A

One tank is normally aligned

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8
Q

What is the general philosophy when processing water through the Monitor Tank Building?

A
  1. The first pass is through the Low Flow Skid to the AMTs
  2. The AMTs are recirculated through the High Flow Skid
  3. AMTs are recirculated through the Carbon Media Pressure Vessel(CMPV)
  4. Cleaned AMTs are released to Lake Wylie via RL
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9
Q

What flow path is the primary means of processing radwaste collected in the Auxiliary Building?

A

The Low Flow Skid

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10
Q

What flow path is the primary means for processing radwaste collected in the Turbine Building during emergency conditions?

A

The High Flow Skid

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11
Q

What is the design/purpose of the Equi-Flex Filter Tank(BFRT)?

A
  1. Preliminary filter for the Low Flow Skid
  2. Uses carbon filtration to remove solid material
  3. Shielded
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12
Q

What is the status of the Low Flow Skid demineralizers during normal operations?

A

Normally all of the Low Flow Skid demineralizers are kept in service

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13
Q

What is the design/purpose of the Powdex Storage Tank(PST)?

A
  1. 30,000 gallon stainless steel tank with a conical bottom
  2. Receives radioactive powdex from the condensate demineralizers for dewatering prior to transfer off-site(design purpose)
  3. Hold-up tank for MTB spent resins until transferred to a High Integrity Container(HIC) —>Functional design
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14
Q

What is the purpose of the Powdex Transfer Pump?

A

Transfers resin from the Powdex Storage Tank to a HIC

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15
Q

What is the purpose of the Powdex Dewatering Pump?

A

Transfers water from the Powdex Storage Tank to the Auxiliary Monitoring Tank via processing equipment

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16
Q

Where are the two Monitor Tank Building Control Panels located?

A
  1. Monitor Tank Building in the MTB Control Room(upstairs in the MTB)
  2. Auxiliary Building 543’
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17
Q

Where are the Monitor Tank Building releases and sluice operations performed from?

A

The Monitor Tank Building Local Control Panel

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18
Q

What is the purpose of the Monitor Tank Building Sump?

A

Collects floor drains and equipment drains in the MTB

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19
Q

How many sump pumps are associated with the Monitor Tank Building Sump, and what are their automatic actions?

A
  1. There are two MTB Sump Pumps
  2. Auto actions:
    A. Hi level - 1st pump starts
    B. Hi-Hi level - 2nd pump starts, annunciator
    C. Low level - secures any operating pump
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20
Q

Why is it important to maintain awareness of tank levels?

A
  1. Prevent overflowing tanks or sumps
  2. Prevent low tank levels to maintain pump suction
  3. During a release if the release has been stopped due to radiation levels
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21
Q

When is it ok to raise the level of a tank after it’s been sampled for release?

A

Once the discharge is complete

22
Q

What is the basic process for processing a Steam Generator Drain Tank?

A
  1. Place the SGDT in recirculation
  2. Un-isolate the desired effluent header and the AMT that the SGDT will be processed to
  3. Un-isolate the desired influent header
  4. Throttle flow for approximately 10-20gpm through the Low Flow Skid(or 10-30gpm for the High Flow Skid)
  5. When the AMT reaches 95% or the desired amount of SGDT is processed, either align to another AMT or secure processing
  6. Close the isolations for the influent and effluent headers and the AMT
23
Q

Why do we blowdown the bag filters at the inlet and outlet of the processing skids prior to changeout?

A
  1. Comply with freestanding water requirements of the disposal regulations
  2. Prevent personnel contamination events
24
Q

What are the power supplies to the Monitor Tank Building loads?

A

SMXN and SMXN1

25
Q

What are the two approved release points from Catawba Nuclear Station?

A
  1. Auxiliary Building 543’

2. Monitor Tank Building

26
Q

What is the generic flow path for a release from the Auxiliary Building?

A

RMT or WMT —>EMF-49 —>1WL-124 —>RN Discharge —>RL Discharge

Release cannot occur if RN is aligned to the Standby Nuclear Service Water Pond

27
Q

What is the generic flow path for a discharge from the Monitor Tank Building?

A

AMT —>AMT Pump —>0EMF-57 —>1WL-X28 —>RL Discharge

28
Q

What is the difference in releases?

A
  1. MTB release may be performed with the RL Low Flow Interlock unavailable
  2. If Unit 2 is in an outage the Unit 2 Cooling Tower Blowdown Valve must be closed
29
Q

What affect does a 0EMF-57 Trip 2 signal have on a release from the Monitor Tank Building?

A

1WL-X28 will close, stopping the release

30
Q

How often do we monitor the release flow rate from the Monitor Tank Building if the RL low flow interlock is not working?

A

Every 15 minutes

31
Q

What affect will a low Low Pressure Service Water flow have on a discharge from the Monitor Tank Building?

A

1WL-X28 will close, stopping the release

32
Q

What will cause an automatic closure of the discharge valve from the Monitor Tank Building to the Low Pressure Service Water System(1WL-X28)?

A
  1. Low RL flow(dilution flow)

2. 0EMF-57 high radiation trip 2

33
Q

What are the five reasons that resin is changed out?

A
  1. Time in service
  2. Low decontamination factor(DF)
  3. High differential pressure
  4. High dose rate
  5. Poor chemical decontamination factor(DF)
34
Q

What is the importance of performing an air blow following sluicing operations?

A

The air blow should dislodge any resin missed by the water sluice and allow it to be directed out of the sluice outlet

35
Q

What are the basic steps for loading a demineralizer in the Monitor Tank Building?

A
  1. Align the flow path to the effluent header
  2. Align AMT to receive waste flow
  3. Isolate the demin to be loaded and place the associated post filter unit in service
  4. Connect blue hoses to the Media Loading Pump
  5. Fill the media container with YM to saturate the media
  6. Perform the “Jar Test”
  7. Transfer media with the transfer pump
  8. After the media is transferred flush the pump and piping with YM
  9. Fill and vent the vessel, then stop the pump
  10. Isolate the vessel, and isolate and vent the pump
  11. Disconnect the media loading pump
  12. Make the next alignment if applicable
36
Q

What is the “Jar Test” when loading a demineralizer?

A

Place a sample of media in a jar filled with water to see if any of the resin beads will float:

  1. Good resin will settle to the bottom in 30-60 seconds
  2. Resin that is cracked or damaged will allow air in, and will float
37
Q

What is the basic procedure for resin transfer in the Monitor Tank Building to a High Integrity Container?

A
  1. Startup the Self Engaging Dewatering Panel(SEDS) Control Panel
  2. Ensure hoses are connected
  3. Connect a hose from the Dewatering Pump Discharge to the desired dewatering flow path, and un-isolate
  4. Run the PST Mixer if desired
  5. Perform a leak check of the transfer system
  6. Dewater from HIC laterals 1 and 2
  7. Adjust Powdex Transfer Pump speed and flow to maintain adequate slurry in the HIC
  8. When the HIC laterals 3 and 4 are covered dewater from them if necessary
  9. When the PST is empty or transfer complete, adjust the Powdex Transfer Pump speed to a setting of 1
  10. Flush Powdex Transfer Pump discharge line until dose is good
  11. Flush Powdex Transfer Pump suction
  12. Shutdown the SEDS Control Panel
38
Q

How many operators are required to load a HIC in the Monitor Tank Building?

A
  1. Two dedicated operators
  2. One in the MTB Control Room(pump operator)
  3. One on the process floor at the HIC(liner operator)
39
Q

What is the purpose of the Monitor Tank Building Ventilation System(AM)?

A
  1. Maintain comfortable conditions in the lab and personnel areas
  2. Provide a suitable environment in the process area for equipment operations and personnel access as required
40
Q

What are the four subsystems of the Monitor Tank Building Ventilation System?

A
  1. Personnel Area Supply
  2. Process Area Supply
  3. Exhaust
  4. Chilled Water System
41
Q

What will automatically trip the Personnel Area Supply Fans?

A
  1. Smoke detector

2. Duct air temperature Low(45F)

42
Q

What will automatically trip the Process Area Supply Fans?

A

Smoke detector

43
Q

What is the design/purpose of the Monitor Tank Building Exhaust System?

A
  1. Maintains the building at a slightly negative pressure
  2. Process area exhaust is provided with HEPA and Carbon filter
  3. Building exhaust is monitored for:
    A. Radioactivity
    B. Exhaust Flow
44
Q

What will cause the MTB Exhaust System Fans to automatically trip?

A

Smoke detector

45
Q

What affect will high radiation, trip 2, on 0EMF-58 have on the MTB Exhaust System?

A

This provides an alarm only, there are no other impacts on system operation

46
Q

What will cause an automatic trip of the Chilled Water Chillers in the Chilled Water Subsystem?

A

Smoke detector

47
Q

What is the source of makeup water to the Compression Tank for the Chilled Water Subsystem?

A

Demineralized Water(YM), and makeup is automatic

48
Q

How many Chillers are in the Chilled Water Subsystem and where are they located?

A
  1. Two chillers

2. Located outside of the Monitor Tank Building

49
Q

What is the purpose of the Bantam-11 Control Panel?

A

The Bantam-11 system allows communication between radiation monitors and their associated RM-80 microprocessors and the user/operator. Its functions include:

  1. Provides operator control of the monitors
  2. Maintains and displays the status of the radiation detectors in the MTB
  3. Indicates changes in the system
  4. Initiates startup of the radiation monitors
50
Q

What are the colors associated with the Bantam-11 Control Panel, and what does each indicate?

A
  1. Green - normal
  2. Yellow - Alert status, greater than or equal to Trip 1
  3. Red - Alarm status, greater than or equal to Trip 2
  4. Blue - Interlock status(ie loss of sample flow)
  5. White - Loss of communication status

Catawba Nuclear Station (72 decks)

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