Letter Sequence Meeting |
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MONTHYEARML17151A2952017-06-0101 June 2017
6/1/2017, Meeting Slide for Pre-Submittal Meeting Regarding Ultimate Heat Sink Technical Specification Change Request for Waterford 3
Project stage: Meeting
ML17174B2262017-06-28028 June 2017
Summary of June 1, 2017, Public Meeting with Entergy Regarding Planned License Amendment Request to Revise Technical Specification (TS) Table 3.7-3 and TS 3/4.7.4, Ultimate Heat Sink for Waterford Steam Electric Station
Project stage: Meeting
2017-06-01
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Category:Slides and Viewgraphs
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[Table view] |
Text
ULTIMATE HEAT SINK TECHNICAL SPECIFICATION CHANGE REQUEST WATERFORD 3 JUNE 1, 2017 1
Ultimate Heat Sink Pre-Submittal Meeting
Introductions
John Jarrell - Regulatory Assurance Manager Jason McGowan - Project Manager Alex Tojeiro - Design Engineer Dale Gallodoro - Entergy Contract Support William Steelman - Entergy Contract Support Greg Zysk - LPI John Cooper and Associates - by phone 2
Ultimate Heat Sink Pre-Submittal Meeting Agenda
- Adverse Condition - Hot Air Recirculation
- Computational Fluid Dynamics Model
- Technical Specification Change 3
Ultimate Heat Sink Design Wet Cooling Tower (WCT)
ACC-126 Temperature ACCW Pump Control Valve CCW HX Dry Cooling Tower (DCT)
CCW Pump Heat Loads 4
Ultimate Heat Sink Design Aerial View Missile DCT Shield Missile Shield DCT WCT WCT 5
Adverse Condition - Hot Air Recirculation The recirculation effect during startup testing was observed to exceed the values used in the design basis, and there is insufficient basis for using the lower values in the design basis.
Outlet Inlet Tube Wall Bundles 6
Resolution - Dry Cooling Tower Recirculation Barrier Train A 7
Resolution - Dry Cooling Tower Recirculation Barrier Train B 8
Resolution - Dry Cooling Tower Recirculation Barrier Before After 9
Computational Fluid Dynamics Model ANSYS CFX
- The complex flow field produced under limiting cooling tower operation is evaluated using ANSYS CFX.
- ANSYS CFX is an appropriate tool for evaluating the complex geometry and mix of buoyancy, wind, and fan driven flows.
- Adherence to NUREG-2152, which describes best practice guidelines for CFD.
- CFD modeling was benchmarked to the 1982 startup test data and was shown to produce conservative results.
10
Computational Fluid Dynamics Model Train A Mesh Detail 11
Computational Fluid Dynamics Model Train A Mesh Definition 12
Computational Fluid Dynamics Model Train A Example Results Case 1:
90F ambient, 30mph NE wind 13
Computational Fluid Dynamics Model Train A DCT Preliminary Results Input Conditions CFD Model Results Wind Wind speed Ambient Recirculation Average fan Fan flowrate Case direction (mph) Temp (°F) (°F) Temp (°F) (x1000 cfm) 1 NE 30 90 5.6 95.6 163 2 SE 30 90 3.1 93.1 157 3 N 30 90 1.3 91.3 168 4 S 30 90 2.2 92.2 171 5 E 30 90 1.5 91.5 151 6 NE 10 98 2.2 100.2 163 7 SE 10 98 0.7 98.7 165 8 N 10 98 0.0 98 161 9 S 10 98 0.7 98.7 166 10 E 10 98 1.4 99.4 162 11 0 102 0.0 102 166 14
Computational Fluid Dynamics Model Train B DCT Preliminary Results Input Conditions CFD Model Results Wind Wind speed Ambient Recirculation Average fan Fan flowrate Case direction (mph) Temp (°F) (°F) Temp (°F) (x1000 cfm) 1 NW 30 90 6.5 96.5 177 2 SW 30 90 6.6 96.6 177 3 N 30 90 1.9 91.9 184 4 S 30 90 7.7 97.7 180 5 W 30 90 2.2 92.2 166 6 NW 10 98 4.7 102.7 177 7 SW 10 98 2.6 100.6 176 8 N 10 98 0.0 98 181 9 S 10 98 0.8 98.8 179 10 W 10 98 1.1 99.1 175 11 0 102 0.2 102.2 180 15
Thermal Hydraulic Model Meteorological Study
- Most severe combination of meteorological parameters as a function of dry bulb temperature.
- Critical time periods in accordance with RG 1.27:
- 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> (LOCA Peak Heat Load)
- 3 day (Natural Circulation Cooldown)
- 3 day (LOCA WCT Water Consumption)
- 7 day (Tornado UHS Heat Load)
- Use of plant data provides significantly more data points than available from NOAA and is more directly applicable to the site.
16
Thermal Hydraulic Model Ultimate Heat Sink - ECM95-008 Calculation ECM95-008, Ultimate Heat Sink Design Basis analyses the following conditions/events:
- Loss of Coolant Accident (LOCA)
- Spent Fuel Pool Cooling, including Full Core Offload
- Normal Operation, Normal Shutdown, and Normal Refueling 17
Thermal Hydraulic Model Ultimate Heat Sink - ECM95-008
- UHS provides cooling for 30 days
- Temperature of Safety Related equipment not Exceeded
- Bounding Meteorological Parameters
- Combination of parameters representative of the site 18
Thermal Hydraulic Model Ultimate Heat Sink - ECM95-008
- UHS Design Basis Reconstitution
- DCT Performance Relationships
- WCT Thermal Performance Curves
- DCT Tube Plugging / Sleeving Allowance
- Integrated System Analysis for Evaluating Water Temperatures and Evaporation 19
Thermal Hydraulic Model Ultimate Heat Sink - Post-Mod Testing
- Confirmatory Testing for New WCT Performance Curves with OOS fans
- Testing will be performed similar to GL89-13 testing, except with WCT Fans Isolated and Covered
- DCT Performance and Recirculation Testing
- CFD Model validated as conservative with startup tests
- Limiting conditions are based upon wind speed, temperature, and heat loads which are not producible during testing.
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Technical Specifications Change Changes to 3/4.7.4:
- 3.7.4.c: Tornado Watch Action Addition of tube bundles.
Allows one fan OOS under missile shield if projected 7-day average temperature is 74°F.
- 3.7.4.d: Temperature Monitoring Adds periodic check of 3-day average temperature
- 3.7.4.e (new): Basin Cross-Connect Adds action for WCT basin cross-connect being inoperable
- 4.7.4.c (new): Basin Cross-Connect Verify cross connect valve can open 21
Technical Specifications Change Current TS Fan Requirements 22
Technical Specifications Change Proposed (Draft) TS Fan Requirements 23
Technical Specifications Change 24
Precedent / History
- Waterford 3 Amendment 237 [ADAMS Accession Number ML12250A435]
- Current Technical Specification UHS fan requirements based upon this amendment.
25
Closing
- Waterford 3 attempted to be proactive with identifying problems with the UHS design and recovering margin where possible.
- The DCTRB increases separation between inlet &
exhaust and provides a real UHS performance improvement.
- Calculations will be provided via electronic file-sharing.
- Expected submittal date is August 4, 2017.
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Conclusion
- Thank you for your time and consideration.
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