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Systems > Radioactive Collection,Processing,& Storage Subsystem(CH) > Flashcards

Radioactive Collection,Processing,& Storage Subsystem(CH) Flashcards

1
Q

What’re the three general areas Radioactive Collection is collected from ?

A

1.)Letdown flow diverted from VCT during feed&bleed operations from shutdowns,startups, & boron dilution
2.)RDT contents RC quality water collected from leak off, drains, & reliefs inside containment
3.)EDT contents consisting of leak drains & reliefs outside containment

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2
Q

Where is the discharge of the Reactor Drain Pumps directed towards ?

A

Directed to either the Pre holdup Ion Exchanger or bypasses it’s by 3way valve for PHIX inlet/bypass valve

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3
Q

What does the Pre-Holdup Ion Exchanger remove from RDT & EDT flow ? What temperature will the PHIX be bypassed ?

A

-Removes resin,lithium,& other ionic radio-nuclides
-The PHIX is automatically bypassed to prevent resin damage

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4
Q

Where does the PHIX outlet process flow go after it’s been processed through PHIX ?

A

-It either passes through gas stripper or bypasses it VIA the bypass valve

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5
Q

What is the gas stripper used for ?

A

-Removes gases to prevent buildup of gases in VCT or CVCS Holdup tank,minimizes release of radioactive fission product gases via vents or liquid discharge

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6
Q

Where is flow directed to after gas stripper ?

A

-Flow is is directed to CVCS HoldUp Tank
-Gas Stripper is normally bypassed

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7
Q

Where is Gas Stripper normally outlet flow path ?

A

Normally directed to VCT just downstream of VCT inlet valve, but could also be sent to CVCS Holdup

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8
Q

When Gas Stripper is in service, what will happen to outlet flow on High Level in VCT ? What happens to flow when VCT level resets ?

A

-Outlet flow is automatically diverted to CVCS Holdup Tank
-When VCT level resets, flow automatically returns to VCT

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9
Q

What status is the Gas Stripper for all 3 units ?

A

Gas Stripper is in long term shutdown and is NOT processing letdown flow

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10
Q

When there is high level conditions in VCT what is the normal flow path for letdown ?

A

-Normally flows through PHIX, bypassed Gas Stripper, and is directed to CVCS HUT for storage

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11
Q

Where is Radioactive waste water stored in until processed & sent to CVCS HUT ?

A

Either in Reactor Drain Tank or Equipment Drain Tank

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12
Q

When is sufficient capacity reach in CVCS HUT ?

A

Operations coordinates with chemistry to process contents with Boric Acid Concentrator

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13
Q

Is the Radioactive,Processing, & subsystem manually operated of automatically operated ?

A

Manually operated

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14
Q

What functions does the Reactor Drain Tank do ?

A

-Receives & condenses discharge from PZR safety valve to prevent it from being discharge to containment
-Receives thermal relief valve discharged from shutdown cooling & SI systems
-Gravity Drain from RCP vapor seal off
-Gravity drains & leakage from containment leakage

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15
Q

What is the RDT normally pressurized with ?

A

-Pressurized with 0.5psig nitrogen blanket for oxygen exclusion

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16
Q

What is minimum water volume used for inside RDT? Where does it come from ?

A

-Used for steam quenching of pressurizer safety valve discharge
-RMW from RMWT maintained minimum quench volume of 52% & used as cooling to lower RDT pressure

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17
Q

Why is the quench Volume of water necessary ?

A

RDT receives some high pressure & temp steam & is needed to cool and condense this steam to prevent Rupture Disc from breaking

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18
Q

What is the RDT rupture Disc setpoint ? What is it used to protect ?

A

Rupture disc setpoint at 120psid & protects RDT from stuck open PZR safety valve

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19
Q

Where does RDT vent to for High Pressure under 10psig? Where does it vent if pressure greater than 10psig ?

A

Under 10psig-Vents to Gaseous Radwaste system
Over 10psig- Vents to containment through RDT Atm. Vent Valve

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20
Q

What functions does the Equipment Drain Tank perform ?

A

-Receives gravity drain from Recycle Drain Header & Ion Exchanger Drain Header
-Receives gas stripper bypass for up to 30 mins between pumping
-Accepts discharge from misc. relief valves outside containment

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21
Q

What pressure is EDT at ?

A

Pressurized with 3psig nitrogen blanket for oxygen exclusion

22
Q

How is the EDT protected from over pressure ?

A

Protected from overpressure by water relief that discharges to Non-ESF sump

23
Q

What do the Reactor Drain Pumps used for ?

A

-Transfers contents from RDT or EDT,through Reactor Drain Filters, then through PHIX

24
Q

What determines the processing path for RDT or EDT ,to either gas stripper or CVCS HUT ?

A

Based on chemical & radiological condition of collected water

25
Q

What is the capacity of Reactor Drain Pumps ?

A

-Has capacity of 50gpm

26
Q

What does interlock do for Reactor Drain Pumps ? What will automatically stop Reactor Drain Pumps ?

A

-Interlocks preventing both pumps from running at same time
-Stop automatically on low tank levels when respective pump suction valves are open

27
Q

What is Pre Hold up Ion Exchanger for ?

A

-Provides supplemental purification of letdown with abnormally high levels of radionuclides or contaminants
-Reduces chemical contaminants prior to BAC processing

28
Q

What is the flow rate the Prehold up Ion Exchanger is designed for ?

A

Designed for Maximum letdown flow rate of 150gpm

29
Q

Where is PreHoldup Ion Exchanger spent resin sent to ?

A

Transferred to Radwaste Radwaste system

30
Q

What is process fluid going to the Gas Stripper column heated up by ?

A

Heated by preheater & Heat Recovery Heat Exchanger by Auxiliary Steam on its way to stripper column

31
Q

What is the Reboiler do to the small portion of water diverted from outlet flow of Stripper column ?

A

Heats up water again by Aux. Steam and converts it steam and directed back to stripper column

32
Q

Where does the steam rise into inside stripper column ?

A

Steam rises through packing,condenses,& joins spray flow

33
Q

When steam rises through gas stripper packing what happens ?

A

Combo of high temp,spraying,& impingement into packing & causes gases to rise above spray line into overhead condenser

34
Q

What temperature is the gas temperature reduced below & what pressure is it maintained at ?

A

Temperature is reduced below 140F & marinated at 3-7psig pressure control valve & directed to Waste Gas Surge Tank & Gas Analyzer

35
Q

After the gases are removed where does the degassed flow go to ? What temperature is it cooled back down to ?

A

1.)Flows to bottom of stripper column
2.)Through Heat Recovery Heat Exchanger & after cooler
3.)Cooled down to a maximum 130F
4.) Then flow to lvl control valve to CVCS Holdup Tank or VCT

36
Q

What is the Heat Recovery Heat Exchanger used for ?

A

It’s used to pre heat incoming water to approx. 150F improving efficiency

37
Q

What is the Pre Heater used for ? Where does steam drain to?

A

-Aux. Steam is used to heat incoming water to 240F
-Steam drains to Aux Steam Condensate Receiver Tank

38
Q

What is the Stripper column used for inside Gas Stripper ?

A

Dissolved non condensable gases are removed within column

39
Q

How does stripper column work ?

A

-Flow is ran through it & counter flow of saturated steam from Reboiler aids stripping process
-Stripped liquid is drawn into discharge pump suction
-Stripped gas enters overhead condenser

40
Q

What is the Overhead condenser used for ? What is it cooled by ?

A

-Condenses entrained moisture in the gas leaving stripper column,while reducing gas volume
-Cooled by nuclear cooling water

41
Q

What is the condensate pot used for ? What must be done to it periodically ?

A

Collects any residual moisture remaining in gas & must be periodically drained

42
Q

When draining Condensate Pot why must you strictly adhere to procedure ?

A

Prevents contaminating room

43
Q

What is the reboiler used for ?

A

Heats up water at bottom of column by Aux Steam which aid in gas stripping process

44
Q

What does reboiler do for Gas Stripper while its in standby ? Where does Aux Steam drain to ?

A

-Maintains the column hot while it’s in standby
-Aux Steam drains to Aux Steam Condensate Receiver Tank

45
Q

Where do the Gas Stripper Discharge Pumps transfer water to ?

A

Transfer water from gas stripper to CVCS HUT or VCT

46
Q

What will auto start Gas Stripper Discharge pump ? What will trip the Pump ? What is pump rated for ?

A

-Auto starts on high column level
-System shutdown signal will trip pump
-Pumps are rated for 140gpm

47
Q

What is the After Cooler after the Gas Stripper used for ? What cools the After Cooler ?

A

-Used to cool stripped liquid down to 130F prior to HUT or VCT
-After Cooler is cooled by Nuclear Cooling Water

48
Q

During short term shutdown what status is Gas Stripper column ?

A

Gas Stripper Column is filled 50% and heated by reboiler due to Aux Steam still be distributed

49
Q

What must be aligned to gas stripper during startup ?

A

-Aux. Steam & Nuclear Cooling Water

50
Q

What considers the Gas Stripper is in long term shutdown ?

A

-Whenever pre heater or Reboiler steam valves are closed
-Stripper column is pressurized at 20psia with nitrogen

Systems (62 decks)

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