ML101790134

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Radwaste and Primary Water Processing to Effectively Manage Tritium
ML101790134
Person / Time
Site: Braidwood  Constellation icon.png
Issue date: 12/31/2005
From:
Exelon Nuclear
To:
NRC/RGN-III
References
FOIA/PA-2010-0209
Download: ML101790134 (20)
v • d • e


Text

Exelil,,.n s Nuclear Radwaste and Primary Water Processing to Effectively Manage Tritium Braidwood Tritium Recycle Team December 2005 nfomnidon inthis record was deleted In a*o .rdalcewthe Freedom of Intomuatlo AL

Where Does Tritium Come From? ExeI~n.,

Estimated Sources of Tritium - PWR Nuclear H-2 in coolant 1%

Fission 0 ". A UsJ.j~

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Wei' Burnable Absorber Leaks 1% 1%

Li-7 in Coolant Bumabi Absorber Diffus n 1%

1%

Tritium (Fission Product)

Diffusion 25% B-10 in Coolant 60%

Li-6 in Coolant 10%

2

Issues Exel.n 5.

Nuclear Braidwood is fourth quartile for liquid tritium released:

Liquid Effluent Tritium Released from US PWR Units - 2003 2500 2000 1500 E

1000 500 0

Note: 2003 is the last full year for which industry data is available.

3

Issues (cont)

Nuclear Braidwood Effluent is Affecting Groundwater and Residential Wells along the Blowdown Line:

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Exelen 5 .

Issues (cont) Nuclear Elevated Tritium in the Groundwater

° Drilled over 100 sample wells and taken approximately 160 samples to characterize the extent of the elevated tritium levels.

  • Contacted local residents potentially affected and sampled private ponds and drinking water wells. In addition to frequent individual contacts, the station has held one meeting with residents and is planning a second meeting.

In the process of conducting a blowdown line integrity test and determining if additional testing is required.

  • Notified regulatory agencies. The team is in the process of responding to a notice of violation received from the Illinois EPA. This response will contain an overall outline of the station's proposed corrective actions.

° In the process of completing a root cause investigation.

5

Short-Term Plan Exek n .

Nuclear Criteria:

° Enable Braidwood to operate without liquid radwaste discharge.

  • All equipment installed and operational before 4/1/06.

° Meet all requirements (e.g. chemistry limits, regulatory requirements) for safe, effective operation.

  • Achieve goals for the lowest possible up-front and ongoing cost.

6

Actions - Braidwood Recycle Team Ni jrl P:-I Short Term (starting immediately through the next 1 - 3 years):

" Release tank liquid discharges were suspended at Braidwood Station

" Team develop methods to allow continued operation with zero liquid release from release tanks

" Water management

- Reduce inputs to radwaste

- Deborate using resin when RCS boron < 200 ppm

- Water management and effective use of installed demineralizers

- Outage water management (e.g. loop fill source)

Lona Term:

  • Operate the plant as designed (recycle primary water)

- Benchmarking revealed best-practice is to operate boric acid evaporators and reclaim primary water to the PWST

- On-line and outage water management

- Vigorously avoid introduction of non-contaminated water into plant drains 7

Braidwood Recycle Team uen ExelNuclear

  • Jeff Odeen (Project Manager) Joe Williams (Sargent & Lundy)

" Bob Claes (iSagacity, inc. - Dave Moschetti (Duratek Braidwood Project Management)

Technician- Braidwood

" Dan Radice (Braidwood Engineering) Radwaste)

" Ray Rosczyk (Braidwood System Tony Didgeon (Duratek)

Engineering)

Darold Morris (Duratek)

" Molly Woodard (Braidwood System Engineering) Miguel Azar (Cantera Radwaste)

" Mike Gagnon (Braidwood RP) Dave Morey (Cantera Chemistry)

" Larry Brooks (Braidwood Operations)

Jeff Drowley (Cantera Engineering)

" Brian Bergmann (Braidwood Operations) 8

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Significant Resin Management ExelnNuclear Implications

" Pre-outage deboration with resin starting at - 250 ppm boron

" Spent resin tank manipulations and resin shipments

  • Outage cleanup demineralizer strategy 10

Strategic Water Management - Issues and Ex Ion Objectives Nuclear Can we prepare HUT water pre-outage to use in combination with boration to make up for volume shrinkage?

Adjust the timing of boration (where possible) and adjust boration rate to better coincide with cooldown so that boration is compensating for shrinkage as much as possible.

  • Only borate RCS to approximately 1700 ppm (slightly above COLR limit) during shutdown. This will reduce the amount of dilutions required during startup.
  • Raise the admin limit for BAST boron if possible. The limit is currently 7700 ppm boron.
  • Manage pressurizer and/or VCT level to accommodate initial boration for the P11 limit.
  • Re-use RCS drain water (loops, PZR, draining to flange) for RCS fill & vent. This water will require purification during the outage. The HUT recirculation rate through the AB condensate demineralizers is only 50 gpm. The RCS drain path is to the RCDT, then AB condensate demin, into the HUT. Don't use blended flow to fill the loops.
  • Evaluation to add peroxide after RCPs are off and LSIVs are closed?
  • Pre-outage activities related to resin management will increase significantly to accommodate deboration from 250 ppm using resin.

Eliminate the practice of using 2 demineralizers in parallel during RCS cleanup to reduce resin transfer water and accommodate de-boration with resin.

Fill the transfer canal with HUT water pre-outage and leave the transfer canal filled post-outage.

11

VA Chiller Drain Modification Nuclear AUXILIARY BUILDING

MiILLER AREA

.LED I FLOOR DRAIN

1. SLNNR-OEV PLATE INST~i ED COL 15/S (A-275) AUXILIARY BUILDING 'VPCA CONDENSATE IN FLOOR~ DRAIN HEADER1 FiR. EL. 463'-(r COLLECTION AND DISPOSAL PROPOSAL
2. BLANXOFF PLATE INSTAL IN FLOOR DRAIN H~EADER~

4" 4SUPPLYPLENUM

  • VK; OML CO14DENSATE DRAIN 4" 'VA7 SUPPLY PLENUM C-D! 13/S (A12710) COIL CONDENSATE DRAIN COL 231/S (A-27-2) lANK ~

TANK 12

Non-Contaminated Drain Modification Exel,ý",,.nm Nuclear PROPOSED CHANGE TO AUXILIARY BUILDING WASTE OIL SYSTEM FOR TRANSFERRING "CLEAN WATEF' TO THE SX PUMP ROOM FLOOR DRAIN SYSTEM

.1 13

Recommended Radwaste Processing and Recycle Solion ExeMnM.Nuclear Process inputs to liquid radwaste from floor drains, equipment drains, reactor coolant letdown, and outage water movement using the existing treatment system and additional equipment as follows:

  • ALPS I (existing system) - filters and demineralizers to remove > - 99

% of all radionuclides from waste stream (except tritium)

  • Reverse Osmosis - to separate contaminants such as silica, boron, hardness, alkalinity into a concentrated waste stream (much more efficiently than removal using ion-exchange). The waste stream would be stored for further processing, opportunistic disposal (with other waste), or shipped for vendor processing
  • ALPS 2 - demineralizers to remove impurities remaining after reverse osmosis, and purify the water to reactor coolant makeup specifications. This water will then be recycled to the Primary Water Storage Tank, discharged via liquid effluent pathway, or further processed for release via gaseous pathway using a boiler (see below)
  • Boiler (optional) - convert liquid stream to steam so that water (and tritium) can be released via a gaseous release pathway within UFSAR limitations 14

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RW PROCESSING MODEL complete with proposed 4-path to PWST (major flowpaths have been highlighted) 4+- 44-

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Radwaste Processing and Recycle System Nuclear Existing equipment installed and in service at Braidwood RO Unit to Reduce Boron as much as possible ALPS = Advanced Liquid Processing System 16

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Boiler Nuclear 17

Cost Analysis for Recommended Radwaste Exekon Pri-O~S~in adU Recycle SolUtion Nuclear 2005 Costs:

" Planning and logistics

  • Design and drawings
  • Engineering and Pre-Operational Testing
  • Equipment configuration
  • Equipment leases

° Tanks

  • Reverse Osmosis
  • Boiler
  • 3 Spare Pumps and 2 Sets of Sea Water RO Membranes
  • Procedures 0 Mobilization
  • Transportation
  • Setup, installation, shielding and hose package Total Capital Purcha _

Total Capital Lease(

Total 2005 Cost 18

ost Analysisfor R commended Ra waste E,.oI oflSM Pro1CessingMI and Re.,cyce. Sol-, nNula 2006 Costs:

Instrumments, Data Acquisition and C0ontrols[

° Project Manager (initial.six months)

  • Media (purchase of,resin and filter media)
  • Equipment Leases (RO/IX/fill head/Boiler-Rental
  • :Installln-site SS-Storage Tanks(One .(i)
  • Total:;Dis sal .Cost (Liner, purchase, transport
  • Vendor Technicians (3 Additional Techs, 24/7)

Total O&M:

STotal: -Capita' Lease:

Total Capital Equip ."

Total 2006 Cost:

  • Living expense included.
    • Tank cost $2/gal does not' include piping to/from tank, permitting, tank heater, pump and berm., 12-16 weeks installed after permitting and engirneering approval. by:Exelon'.:Storage. tanks eve'ntually fill up, requiring additional storage,

,capacity or processing. Thewsesrmwolbetrdfr further. processing, opportunistic disposal (with other waste such as Blowdown resin),jor shippe~d for vendor processing $3.1 M or installed boric .acid dryers to process concentrAtesp.on-site for disposal 1- 1 onh estimated: costý$1f'.3 -$1.7 Million (does. not include waste liners, transportation and disposal cost).

19

0 Cost Analysis for Recommended Radwaste -ExeInflsM Procesing and ecycleV- SOUlution Nuclear 2007 Costs:

0*

  • Media (purchase of resin, and filter media;
  • Equipment Leases (RO/IX/fill head/Boiler Renta

° Total -Disposal Cost (Liner, purchase,. transport)

° ,Vendor Technicians (3 Additional Techs, 24/7)

Total O&M:

Total Capital.Lease:

Total Capital Equipment:

Total 2007 COSt:F

  • Living expense, included.

250,000 gallons storage tanks is nearing capacity (205,000 gallons of boric acid concentrates), requiring additional storage capacity or processing. The waste stream can continued to be stored: for further processing, opportunistic disposal (with other waste such as (Blowdown resin ), or shipped for vendor processing $3.1 M for2007 based on current Duratek contract 143 rates.

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