ML101260084
| ML101260084 | |
| Person / Time | |
|---|---|
| Site: | Washington Public Power Supply System |
| Issue date: | 09/08/2008 |
| From: | ABS Consulting, Entergy Corp |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| FOIA/PA-2010-0171 | |
| Download: ML101260084 (28) | |
Text
Turbine Building Siding Damage September Investigation 8, 2008 THE POWER OF PEOPLE
Introduction
- Root Cause Team Organization
- Data Gathering
- Initial Findings
- Installation Recommendations
"-Entergy THE POWER OF PEOPLE' 2
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Root Cause Team Event Analysis _
Paul Bruck, ABS Ben Harrison, ABS Condition Assessment~
~Boh Kon4z Materiai Analysis Boris Goldenberg, LPI iýAlessandro Eldridge, LPI\\
Meteorological Eval, Rolando Vega, ABS THlE POWER~ Of PEOP5'Lm" 3
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Data Gathering Ben Harrison, P.E.
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Easterly face
- ntergy THE POWER Of~ PEOPLEm 5
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Southern face THlE PO WER Of PEOPLE" a AB Consulting Rl,;SK CONSIUIrNG; EVISION
Westerly face THlE POWER OF PEOPLETU
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Girt Close Up Shows Fastener from Panel Bottom is Intact i---'A En tffWv THE POWER OF PEOPLE" 8
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Panel Top Outer Panel Sub Girt Angle at Top of Panel
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Inside Panel
Top of Panel.
Rivet Sheer Scoring from Rivet in Angle \\
Failure (Girt Shown)
_--Sheared Rivet BSPQ-6 Bottom of C
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Inside Panel Bottom Connection Pullover
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Wind Event Summary Rolando Vega, Ph.D., P.E.
--" OEnWtergyO T'HE POWER OF PEOPLE"*
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Definitions of Wind Speed
- 3 Second Gust
- A gust that is sustained for 3-seconds.
1*1 Hour Wind
- Average of all gusts that occur in that time
" Fastest Mile
- Average wind speed over the shortest time for the wind to travel a mile SEn tergy THE POWER OF PEOPLET 14 CONUrNonsulting
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Probable gust wind speeds at River Bend LUGal mret. tower- -
Ive[ DHeU I.u I u oparse pine iores[
l u-seconos NWS Baton Rouge Airport 91.0 33 Open field 11-second TTU - StickNet (PRELIMINARY) 67.1 8.2 Open field 1/5 or 1/10 seconds
- Logarithmic Law for Heit corrections' 8 Durst's curve for averain Tie corrections.
- Wieringa's Exposure correction factors.
Probable wind speed at River Bend Plant Sorc 3-sec (riph)j
-f astest-mile (mph)
Gmeis Local met. tower (exposure corrected) 64.3 52.7
- 1.... where the data is averaged spatially or the NOAA - H*WIND (@ 2:30PM) 62.9 51.6 turbulence of the wind is not fully captured.
TTU - StickNet (from preliminary data) I 105.8 NWS Baton Rouge AirportI 92.8
+
86.8 76.1 S2.... where the data better represent the turbulent structure of the wind during the hurricane.
" The probable maximum 3-second gust at 10 meters for the Turbine Building of Entergy at River Bend Nuclear Facility should have been around 100 mph +/- 1Omph.
THE POWER OF PEOPLEO RISK CONSU&TING DIVISION
Wind Speed Damaged Indicators
- 1. Stand of Pine Trees
- 2. Cooling Tower 3.
Turbine Building
- 4. Signage
- 5. Large Sliding Door
- 6. Wooden Building Canopy
- 7. Stand of Pine Trees T EntergO Tile POWER OF PFOPLIEI 17 m
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Initial Observations THE POWER OF PEOPLE" 22 ABS Consulting RISK CONSUTIJlNG DIVISION
Structural Considerations
- Panels Failed Outward.
Scoring on Girts from Fastener Consistent
- Negative Pressure on Side and Rear Walls Pull-Over Capacity of bottom connection Higher load required to fail Therefore, Top Connection Should Fail First
- Portion of West Girt Not Installed
- Specification Requirements of Siding Detachment Load of 70 psf Peak Service Load of 50 psf Reserve Capacity on Service Load 70/50 = 1.4
- Pressure Capacity Of Cladding
- Design Capacity 70 psf
- Preliminary Capacity Estimate 55 psf
- Enterggy 23 THE POWER OF PEOPLIET0
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Preliminary Conclusion THE-En terg THlE POWER OF PlEOPLFE 24 Consulting RISK CONSULlING FIVISI(N
Preliminary Conclusions
- Inspected Panels Not Installed per Design Documents
- Not All Panel Spans.Evaluated
- Large Variance in Rivet Spacing for. Detachment Condition o Detachment Load was Reduced by Installation Deficiencies
- Wind Evaluation ShOws Evidence of Local Higher Wind Gusts
- Wind Speeds Were Capable of Achieving Detachment Pressure of 55 psf 25 Consulting T'HE POWER OF PEOPLE" RISK CONSULTING DIVISION
Installation Recommendations
" 'Reinforcement of Comers for Higher Pressures.
" Reevaluate Rivet/Angle Design
- Increase AngleCapacity
- Reduce and Control Rivet Spacing Wind e Complete Installation of Missing Girt THE POWER OF PEOPL E TVKCNS~
N 26 ABSConsulting HISK CONSUIJIMG FINHION
Moving Forward
- Complete Field Investigation
- Validate Analysis
- More Detailed Analysis
- Metallurgical Testing
- Laboratory Testing
- Complete Root.Cause
-En* tergy 27 TilE POWER OF PEOPLE" Analysis RISK CONSULTING 1IIN
Questions THIE POWER~ OF PEOPLE"'
28 RISK CON~S(jti N DIVISIO