ML102910729

Email - Subject: Emailing: Failure Modes CR3, Rev. 6 111809 NRC Pkg No Rs. Ppt Attachments: Failure Modes CR3, Rev. 6 111809 NRC Pkg No Rs. Ppt

ML102910729
Person / Time
Site:	Crystal River
Issue date:	11/30/2009
From:	Lake L NRC/RGN-II
To:	Robert Carrion, Lake L, Masters A, Naus D, George Thomas NRC/RGN-II, Oak Ridge
References
FOIA/PA-2010-0116
Download: ML102910729 (17)

Text

Lake, Louis

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From: Lake, Louis Sent: Monday, November 30, 2009 1:17 PM To: Dan naus; Lake, Louis; Masters, Anthony; Robert Carrion; Thomas, George

Subject:

Emailing: Failure Modes CR3, Rev.6 111809 NRC pkg no Rs.ppt Attachments: Failure Modes CR3, Rev.6 111809 NRC pkg no Rs.ppt , /; _

Hi team; Hope everyone had a great thanksgiving.

for your information, attached is the kist of probable causes being reviewed by PI1. This list will be helpful as we review the refuted root-causes.

Lou The message is ready to be sent with the following file or link attachments:

Failure Modes CR3, Rev.6 111809 NRC pkg no Rs.ppt Note: To protect against computer viruses, e-mail programs may prevent sending or receiving certain types of file attachments. Check your e-mail security settings to determine how attachments are handled.

1 K?!'

Failure Modes of CR-3 Containment Concrete Delamination Issue (Revision 6, 11/18/2009)

PII Root Cause Investigation Team Dr. Chong Chiu, Marci Cooper Dr. Patrick Berbon, Dr. Mostafa Mostafa, David

Dearth (PE),

Dr. Avi Mor, Dr. Luke Snell, Dr. Victor Saouma, Joe Amon (PE), Henric Larsson, Dave Brevig, Dr. Ray Waldo P1 .ortz ry 3nd Conffreii!,20.D 11/13/2009 AetTetease-tu;rthlrd pa, ty wfthe" 1

Nine Defined Categories

1. Inadequate Concrete Design or Analysis (High Local Stress)j

2. Inadequate Concrete Construction

3. Inadequate Use of Concrete Materials

4. Shrinkage, Creep, and Settlement

5. Chemically or Environmentally Induced Distress

6. Inadequate Concrete-Tendon Interactions

7. Inadequate Containment Cutting

8. Operational Events

9. External Events

10. Other or Emerging - as needed PfI -*up"ttr',' nd Cnnfidenltial. 2AflQ Do 11/13/2009 n2t rz.casc-toa third party withnut perrmisstiu,.

1. Inadequate Design and Analysis (Excessive Local Stress) 1.1 Excessive local stress from axial loading 1.2 Excessive radial stress gradients 1.3 Excessive tensioning of horizontal tendons 1.4 Excessive tensioning of vertical tendons 1.5 Foundation settling 1.6 Inadequate design against ground movement 1.7 Containment long term, low-level vibrations 1.8 Added stress from tendons not in same plane 1.9 Added stress from variations in tendon spacing 00 IiUtF ,tand Conf!dential, 2009_no 11/13/2 009 rnil. ,tlea*t .- a third P--t': wA~thOut 3

1. Inadequate Design and Analysis (Excessive Local Stress), cont.

1.10 Added stress from voids around tendon sleeves 1.11 Added stress from hair-line cracks of concrete 1.12 Added stress from inadequate size of tendon sleeves 1.13 Inadequate net loading area of concrete due to presence of horizontal sleeves 1.14 Added stress from equipment hatch located underneath in same bay 1.15 Inadequate design analysis methods of radial loads (especially near concrete outer skin) 11/13/2009 not dees tu a third

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2. Inadequate Concrete Construction 2.1 Inadequate hydration or curing (early set, mix time, w/c ratio) - includes early age cracking 2.1.a Inadequate hydration 2.1.b Inadequate curing 2.2 Inadequate concrete pouring (>10 ft) 2.3 Inadequate slump in confined space 2.4 Inadequate construction of structure 2.5 Inadequate temperature control during curing 2.6 Inadequate interactions among aggregates/cements/admixtures 11/1p3/ 9. . ... , 200a Do 11/13/2009 nateetadatr *;,wathout 5

2. Inadequate Concrete Construction, cont.

2.7 Inadequate vibration during pour 2.8 Inadequate support of tendon sleeves during pouring 2.9 Void or cracks due to inadequate forms (leaky, insecure, early stripping) 2.10 Tendon tensioning too early after pouring 2.11 Inadequate construction cold joint P11-P r. 1 3/2 0-09ntial, 2609. e 11/13/2009 not . ........ i:._ ,._.., ~w~t t 6

3. Inadequate Use of Concrete Materials 3.1 Inadequate entrained or entrapped air 3.2 Inadequate grouting materials 3.3 Inadequate Cement Materials 3.4 Inadequate aggregates (contaminated aggregate, missing coarse aggregate, reactive aggregate, soft aggregate) 3.5 Inadequate admixtures 3.6 Inadequate Slump - DELETED (covered in 2.)

3.7 Inadequate Break Test used to Verify Compliance

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4. Concrete Shrinkage, Creep, and Settlement 4.1 Excessive plastic shrinkage 4.2 Excessive drying shrinkage 4.3 Excessive autogenous shrinkage 4.4 Excessive carbonation shrinkage 4.5 Excessive basic creep 4.6 Excessive drying creep 4.7 Excessive segregation induced cracks 11/132p0ri09ar*' ,,, t idc÷;-l, 2009 Do 11/13/2009 n~otre.^,^e-o +L.:., part*,, , t,* i4

4. Concrete Shrinkage, Creep, and Settlement, cont.

4.8 Non-vibration induced fatigue cracking a Temperature variations over time b Temperature variations inside/outside c Humidity variation over time 11/13/2009 11/13/209 floL a thiw* i thu9 9

5. Chemically or Environmentally Induced Distress 5.1 Foreign material intrusion/contaminants during construction 5.2 Salt water intrusion 5.3 Chemicals introduced during routine maintenance 5.4 Concrete outgassing and release 5.5 Corrosion of rebars, sleeves, and tendons 5.6 Inadequacy of grease lubrication capability 5.7 Physical Attack 5.7a Salt Crystallization 5.7b Freezing and Thawing (also 4.8) 5.7c Thermal exposure/thermal cycling (also 4.8) 5.7d Irradiation 11/13/2009 nn t j ;,i, d aJ ";without 10

5. Chemically or Environmentally Induced Distress, cont.

5.8 Chemical Attack 5.8a Sulfate attack 5.8b ASR or ACR - ASR with Fine Aggregates 5.8c Efflorescence/Leaching 5.8d Acids/Bases 5.8e Aggressive Water 5.8f Biological Attack 5.8g DEF - Delayed Ettringite Formation 5.8h Carbonation 11/13/2009

6. Inadequate Concrete-Tendon-Liner Interactions (During Operation) 6.1 Uneven tension distribution along the tendon due to excessive local duct friction 6.2 Strain hardening of some tendons 6.3 Added stress from thermal effects of greasing 6.4 Added stress from differences between rigid and flexible sleeves 6.5 Inadequate tendon re-tensioning in surveillance activities 6.6 Inadequate initial tensioning of tendons P11r.1 a12 0 ciii 1 1 /1 3 /2 0 09 -a t - l a t a t -dp " ;:, oJ 12

7. Inadequate Containment Cutting 7.1 Excessive local stress gradients during cutting 7.2 Shock or vibration induced concrete separation due to resonant vibrations during hydro-blasting 7.3 Inadequate pattern of de-tensioning of tendons 7.4 Added stress to adjacent tendon due to de-tensioning 7.5 Added stress due to removing tendons and concrete at opening (thermal stress) 7.6 Vibrations due to cutting tendons under tension 7.7 Cracking due to pre-existing defects in this area 7.8 Excessive water jet pressure 11/13/2009 "not rele-dse tu Ut 13

7. Inadequate Containment Cutting 7.9 Inadequate hydro-blasting rate 7.10 Formation of fine micro-cracks from hydro-blasting 7.11 Added stress from pulling tendons out of sleeves and grease after cutting 4e-. : --1 QQ- Do 11/13/2009 11/13/2009*14" 14

8. Operational Events 8.1 Prior spray event leading to low pressure inside containment 8.2 Thermal stresses due to containment spray 8.3 Effect of faster pressurization/depressurization rates during last ILRT) 8.4 Inadequate concrete structure monitoring/

maintenance (IWL) 8.5 Containment depressurization due to inadequate purging operation 15 11/13/2009 II L

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9. External events 9.1 Hurricanes or Tornados 9.2 Seismic events 9.3 Ground Movements (sink holes or geo-sliding PJ1-Proprict=a.y nd Confydentia, 20099.Do 11/13/2009 16