- Basic purpose or function of the CPDS is to remove dissolved and suspended impurities from the secondary side condensate water.
- The removal of impurities and corrosion products in the secondary system reduces corrosion damage to the secondary system equipment.
- Some sources of impurities:
- Corrosion products carried over from the turbine, condenser, feedwater heaters (after startup), and piping.
- Condenser circulating water (CCW) in-leakage to the main condenser due to condenser tube leaks.
- Air in-leakage from the main condenser.
- Radioisotopes carried over into the secondary side due to steam generator tube leaks.
- Conductivity of the water leaving the condensate polisher units normally should be less than 0.1 µmhos/cm
- Due to Boron injection conductivity may be higher than 0.1 µmhos/cm
- Bypass Valve - 1,2 (FCV-14-3): Bypasses condensate around Condensate Polishing Demineralizer System (CPDS) when fully open
- Forces condensate through Condensate Polishing Demineralizer System (CPDS) demineralizers when not fully open
- be throttled, open or closed.
- 18"butterfly valve - air to close
- Handswitch located on El. 706 on the CPDS control panel. The four positions on the switch are: (1) OPEN, (2) THROTTLE, (3) CLOSE, and (4) RESET.
- OPEN - This position used to manually open the 14-3 (bypass) valve. In this position, all flow will bypass the polishing units.
- THROTTLE - This position used to partially open the bypass to allow some of the flow to bypass the polishing units.
- CLOSE - This position used to completely close the bypass valve allowing full flow through the polisher units.
- RESET - In this position valve will automatically open to throttle position on high ΔP of 60 psid.
- If the inlet water temperature reaches 130°F (as seen by TE 14-174), the bypass valve should be completely opened manually by-passing all flow around the polishers. This is to protect the anion beads.
- When closing a polishing unit bypass FCV-14-3, check with the unit operator to determine the number of polishing units required to pass condensate flow.
- Has a manual bypass valve 14-550 which is used normally to control polisher flow rate/ΔP when FCV-14-3 is closed.
- DP Gauges - Differential pressure gauges indicate the pressure drop across resin trap and alarms at 15 PSID.
- (Must be back washed per 1 (2)-SO-14-1 Section 8.1)
- Sump dimensions are approximately 6 feet by 6 feet square and approximately 6 feet deep.
- Two (2) each sump pumps. 180 gpm at 18 psig.
- Can discharge to:
- High Crud Tanks
- Neutralization Tank
- Non-Reclaimable Waste Tank (currently not used at SQN)
- Can receive from:
- All waste tank overflows.
- Floor drains on elevations 685 and 706.
- Sluice Water Relief Valve
- High Crud Tanks (HCT)
- Two (2) each 19,000 gallon capacity tanks.
- Located in basement of Condensate Demineralizer building.
- Two (2) each high crud tank pumps.
- 180 gpm at 140 psig
- Used to re-circulate the High Crud Tanks
- Used to discharge the High Crud Tanks to the Turbine Building sump or cooling tower blowdown
- Controls are local and on the Condensate Demineralizer control panel.
- High Crud Tanks can receive waste water from the following:
- Regeneration backwash and rinse down
- Resin trap backwash.
- Condensate Demineralizer building sump.
- Neutralization Tank
- One (1) tank with 19,000 gallon capacity.
- Two (2) neutralization tank pumps.
- 60 gpm at 25 psig
- Used for recirculation and discharge of Neutralization Tank.
- Controls are local and condensate Demineralizer control panel.
- Receives waste water during regeneration chemical injections.
- CONDI Bldg sump can also be aligned to this tank
- Tank located in basement of condensate Demineralizer building.
- Non-Reclaimable Waste Tank (NRWT)
- One (1) tank of 10,000 gallon capacity
- Two (2) NRWT pumps
- 60 gpm at 75 psig
- Used to re-circulate and discharge Non-Reclaimable Waste Tank (NRWT).
- Receives waste water during regeneration chemical injections
- Controls are local and on condensate Demineralizer control panel.
- NRWT is located in basement of condensate Demineralizer building
- 0-SO-14-3 "Condensate Demineralizer Resin Regeneration"
- Precautions
- Comply with safety requirements for acid and caustic solutions
- Maintaining consistently proper flow rates during regeneration steps is essential for maximum regeneration efficiency (see next objective)
- Dilution water not to exceed 130°F (Prevents damage to resin)
- Don't operate regeneration Handswitches in Auto. (Prevents undesired automatic actions)
- Only open 1 sluice water valve to prevent cross-tying units condensate systems
- Sluice water FCV 14-112 is a flow and pressure control valve. If downstream pressure is >70 psig, it modulates closed regardless of FIS setting, which may necessitate manual flow throttle valve adjustment to maintain <70 psig at desired flow. (Ensure sluice water)
- Pre-regeneration
- Instruments available for service
- Adequate level available in acid and caustic tanks (20%).
- Waste disposal system available
- Hotwell pump in service to provide sluice water.
- Approval to use sluice water from the appropriate unit operator
- Complete Attachment 1 during the regeneration process
- The polisher charge has been transferred to the Receiving Tank
- Normal Regeneration
- Partially drain Receiving Tank to High Crud Tank (HCT) until level is just above resins. This is done to prevent forcing resins through the vent screen during the subsequent air scrub.
- Air scrub of the Receiving Tank loosens debris from the resins which enhances cleaning, using service air.
- Back-flush the Receiving Tank vent to free any resins forced into it during the air scrub.
- Completely refill the Receiving Tank with sluice water.
- Perform a primary backwash of the resins to remove impurities. Resin cleanliness is important for a successful regeneration. Backwash water is from the sluice header with the drain aligned to High Crud Tank (HCT). (Note: Backwash flow rate is dependent on sluice water temperature and if the temperature is >130°F, the Receiving Tank inlet will auto close.)
- If bed conditioning has not been performed, repeat initial steps through 2nd backwash.
- Perform a secondary backwash to the High Crud Tank (HCT) which is at a lower flow rate to allow cation (dark) and anion (lighter) resins to form a separation line.
- Using DI water, flush the anion transfer header.
- Ensure cation/anion interface line is between 7-1/2" and 7-3/4" on the middle Receiving Tank sight-glass. Interface level is adjusted by adding or removing cation resins. (55 gallon drum of used resins changes level 1-1/2".)
- Transfer anions to the Anion tank. Its important not to have cation carryover. Transfer is accomplished by using a slow backwash to the High Crud Tank (HCT) to keep the cations on the bottom, then opening the anion outlet. An ideal transfer will leave only 1/4" of anions in Receiving Tank.
- Partially drain the Receiving and Anion tanks to High Crud Tank ( HCT).
- Air scrub Receiving tank and Anion tank.
- Back-flush receiving and anion tank vent screens
- Backwash Receiving and Anion tanks to the High Crud Tank ( HCT).
- Adjust water level in the Receiving and Anion tanks to 6-8" above the resins.
- Perform chemical injection of acid to the Receiving Tank and caustic to the Anion Tank. Sluice water must be used for dilution flow rather than DI water. If condensate temperature is <105°F, then the hot water tank is on. Ventilation must be in fast speed, and 2 operators must be present during injections with constant attention being given to the injection flow rate to ensure the correct chemical concentration is obtained. Waste water is routed to the Neutralization Tank or Non-Reclaimable Waste Tank. Compliance with safety requirements when handling acid and caustic equipment is required.
- Acid and caustic displacement is performed immediately following the chemical injection. The sluice water flow rate is set at ~40 gpm for the acid draw and ~24 gpm for the caustic draw with the waste water still aligned to the Neutralization Tank or Non-Reclaimable Waste Tank (NRWT) latter is not normally used).
- Perform a rinse of the Receiving and Anion tanks at a sluice water flow rate of 200 gpm to each tank, with the drains still aligned to the Neutralization or Non-Reclaimable Waste Tank (NRWT), until the tanks are full. The drains are then realigned to the High Crud Tanks (HCTs) and the rinse is continued until the rinse water conductivity is ≤10 µmhos.
- Flush the Storage Tank to remove any chemical leak through.
- Transfer the Anion Tank to the Storage Tank using service air and sluice water.
- Transfer Receiving Tank to the Storage Tank using service air and sluice water.
- Partial drain the Storage Tank to the High Crud Tank (HCT), then an air mix of the Storage Tank is performed.
- Rinse the Storage Tank to the High Crud Tank ( HCT) with a sluice water flow of 350-400 gpm, until conductivity is ≤.08 µmhos.
- Maintaining consistently proper flow rates during regeneration steps is essential for maximum regeneration efficiency
- 0-FCV-14-112, Sluice Water FCV, operates as a flow control and pressure control valve.
- When downstream pressure increases to 70 psig 0-FCV-14-112 modulates closed as necessary to maintain ≤ 70 psig regardless of flow indicating controller 0-FIC-14-112 setting.
- When desired flows cannot be achieved due to pressure increasing to 70 psig, adjustment of system manual flow throttling valves may be required.
- The two types of releases used are continuous and batch.
- Continuous Release
- Under normal conditions with little or no activity present, the High Crud Tanks are released to the
TB Sump as a continuous release using
0-SI-CEM-014-400.2.
- If chemistry determines the continuous method cannot be used, the High Crud Tanks (HCTs) are Batch released to the Cooling Tower Blowdown (CTBD) using 0-SI-CEM-077-400.3 or 0 SI CEM 014-400.2.
- If the activity level is too high to be released to the river, the HCT’s are pumped to Radwaste for processing prior to release. This transfer requires SM approval.
- The RCL Shift Supervisor is responsible for determining the type of release that is appropriate.
- Batch Release
- Under normal conditions with little or no activity present, the Neutralization tank is Batch released to the TB Sump using 0 SI CEM 014-400.2.
- If the activity level is too high, 0-RM-90-225 is Inop, or the Composite Sampler is Inop, a Batch release to Cooling Tower Blowdown (CTBD) is performed using 0-SI-CEM-077-400.3.
- The RCL Shift Supervisor is responsible for determining the type of release.
- High Crud Tank (HCT) Continuous Release
- Allows for a release while the tank is being filled, however, fill water cannot have the possibility of containing acid or caustic solutions, or the NPDES may be violated. This limits the water inlet to resin transfer, backwash and final rinse.
- Continuous release package 0 SI CEM 014 400.2 is closed out at 2400 on the last day of the month and another package is required to resume release operations.
- High Crud Tank (HCT) to be released must be aligned for recirculation and the pH adjusted to a range of ≥6.0 and ≤9.0. The pH readings are recorded every 4 hours during the release using a pH meter.
- Ensure the composite sampler operable
- Obtain verbal permission from the RCL Shift Supervisor and obtain the 0-RM-90-225 required setpoint. Then verify the actual setpoint with the Unit 1 SRO.
- Ensure the 3 way discharge valve is aligned to the Cooling Tower Blowdown (CTBD).
- Record the start / stop times on Appendix D.
- Terminate the release when the High Crud Tank (HCT) continuous release is no longer needed.
- A continuous release may be made to the LVWT pond by way of the Turbine Building sump in a similar manner.
- HCT Batch Release
- This type of release must be used when 0-RM-90-225 is inoperable, the composite sampler is inoperable, or activity is greater than 0-SI-CEM-014-400.2 limits, at the discretion of the Chemistry Shift Supervisor and at the discretion of the SM
- This release is used in conjunction with 0 SI CEM 077 400.3.
- The High Crud Tank (HCT) to be released is aligned for recirculation.
- Estimate the time to re-circulate 2 volumes of the High Crud Tank (HCT).
- Request a sample of the High Crud Tank (HCT) from RCL
- Check the cooling tower blowdown flow rate at >17,000 gpm.
- Ensure that no other release is in progress.
- Check 0-RM-90-225 is operable.
- Start the High Crud Tank release.
- At 10% level, ensure the HCT pump(s) trip off.
- Neutralization Tank Release
- The Neutralization tank will only be released by the batch method.
- 0 SI CEM 077 400.3 will be used if 0-RM-90-225 or the composite sampler is inoperable, activity is greater than 0-SI-CEM-14-400.2 limits, or at the discretion of RCL Shift Supervisor or the SM.
- All other Neutralization Tank releases will be done by 0 SI CEM 077 400.2.
- Operator Rounds per 0-GO-14-8
- Polisher Bed Status/Flow
- Bypass Differential Pressure (taken hourly if FCV-14-3 isolated)
- Acid Storage Tank Level
- Caustic Storage Tank Level
- Demineralizer Service Run Data Sheet
- Place a standby polisher in service as follows:
- Notify the Unit Operator that a polisher is being placed in service.
- Ensure the polisher to be placed in service has been filled and vented in accordance with the appropriate procedure.
- Slowly open the condensate polisher inlet isolation for the polisher being placed in service.
- Slowly open the condensate polisher outlet isolation for polisher being placed in service.
- Minimum flow through each polisher is 1000 gpm and maximum flow is 3740 gpm.
Maximum differential pressure between influent and effluent header is 60 psid.
- The flow through the in-service polisher is dependent on chemistry requirements. The Chemistry Section recommends flow rates through the in-service polishers.
- If flow through the polisher(s) is not within a desirable range, or a polisher is not going to be removed from service, then:Throttle [14-550], Condensate Polisher Manual Bypass, until a desirable flow is obtained.
- When the polisher is satisfactorily in service, then:
- Record date and time the polisher was placed in service in the log and on Appendix A, Service Run Data Sheet.
- Notify the appropriate CRO and RCL Shift Supervisor of the date and time the polisher was placed in service.
- Ensure [HS-14-1175], cation conductivity alarm cutout toggle switch, (located on CI-14-15) is in the normal position.
- Place the alarm cutout toggle switch for the polisher placed in service in the normal position.
- If the polisher outlet conductivity is not < 0.1 µmho on the conductivity recorder [CR-14-15], then: Notify RCL Shift Supervisor.
- Remove a polisher from service as follows:
- Ensure permission has been obtained from the appropriate CRO to remove polisher from service.
- If the polisher being removed from service is to be replaced with a standby polisher, then place the standby polisher in service in accordance with plant procedure.
- Removing a polisher from service will cause the flow though the remaining in service polishers and system ΔP to increase.
- If removing a polisher from service will cause system &DeltaP to exceed 60 psid, then Throttle open [14-550], FCV-14-3 manual bypass, until system ΔP is reduced by 50%.
- Close the applicable Condensate Polisher Outlet Isolation.
- Close the applicable Condensate Polisher Inlet Isolation.
- Record the following data on Appendix A, Service Run Data Sheet.
- Date and Time removed from service.
- Reason removed from service.
- Notify the appropriate CRO and RCL Shift Supervisor of the date and time polisher was removed from service. When a flow totalizer is inoperable, the flow total can be obtained by multiplying time in service (minutes) x average flow-rate (gpm).
- Record the flow total reading on Appendix A, and if totalizer is operable, then, Reset the flow totalizer.
- Place the alarm cutout toggle switch for the polisher removed from service in the cutout position. Flow through in-service polishers is dependent on chemistry requirements. Chemistry Sections will supply recommended flow rates through in-service polishers and will be responsible for when and how chemicals will be injected into the condensate system.
- If flow through the remaining polisher/polishers is not within a desirable range, then Throttle [14-550], Cond Polisher Manual Bypass, until a desirable flow is obtained
- Make appropriate entries to the Narrative Log.
- Minimum flow through each polisher is 1000 gpm and maximum flow is 3740 gpm.
- Maximum differential pressure between influent and effluent header is 60 psid.
- The flow through the in-service polisher is dependent on chemistry requirements. The Chemistry Section recommends flow rates through the in-service polishers.
- Flow through in-service polishers is dependent on chemistry requirements.
- Chemistry Sections will supply recommended flow rates through in-service polishers and will be responsible for when and how chemicals will be injected into the condensate system.
- Ensure polishers have been filled and vented and notify the Unit Operator.
- Ensure the rinse header is isolated from other sources.
- Throttle closed the rinse header manual isolation 10 turns from fully open position.
- Open the rinse water outlet.
- Open the sluice water valve.
- Throttle open the manual fill valve.
- When the header is pressurized, throttle open 14-970 to pressurize the header to the Turbine Building.
- When the rinse header to the Turbine Building is pressurized, fully open 14-970.
- Close the manual fill valve.
- Slowly open the condensate polisher inlet valve.
- Notify the RCL Shift Supervisor that a polisher is being rinsed to hotwell.
- Set the rinse flow rate and log start time.
- Ensure the RCL had obtained a sample.
- Terminate the rinse when applicable.
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