ML102910724

Email - from: Lake, Louis to Dan Naus; Lake, Louis; Masters, Anthony; Carrion, Robert; Thomas, George Dated Monday, November 30, 2009 1:17 PM Subject: Emailing: Failure Modes CR3, Rev.6 111809 NRC Pkg No Rs.Ppt Attachments: Failure Modes CR

ML102910724
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: ML102910724 (17)

Text

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

Subject:

Emailing: Failure Modes CR3, Rev.6 111809 NRC pkg no Rs.ppt (( j'4" Attachments: Failure Modes CR3, Rev.6 111809 NRC pkg no Rs.ppt 71 _ ____.___.._

Hi team; Hope everyone had a great thanksgiving.

for your information, attached is the kist of probable causes being reviewed by P11. 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.

I P//Pý

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

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.11/13/2009 oet relepse to a th*ir pa'i 11/13/2009. it.h..t 1

Nine Defined Categories

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

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 11/13/2009 ilcase to

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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

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

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) 11/1 9tar ad Ccnfidcnta, 2009. Do4 11/13/2009 --iut ,elease to a third party witIlcu* 4

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 11/13/2009 not, rease to 8 third pafy without 5 permissinn

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 11/1n...20.... and Confid l , 2009. DO 11/13/2009 .....t '~a. to LIr

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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 11/13/2009 net roleaseo

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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 P r1P*Prictary--c Conf: d09Doa, 11/13/2009 8

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 12 ay~aa~onfdeatý9.Do 11/13/2009 rtot relcae La44Jp- y~vIn 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/d09l, 2009. DO 11/13/2009 IIui ,elease to athrd party withou~t 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 11/13/r2pr0e dJy

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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 PT Prapiietary ad Cu. fidenitl, 2000. Do 11/13/2009 flut release to a tid lJa, ty wiLIdt 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 "PIr d on l , .

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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 11/13/2009 150 11/13/2009 15

9. External events 9.1 Hurricanes or Tornados 9.2 Seismic events 9.3 Ground Movements (sink holes or geo-sliding P+1 ' cp-it-", rLo y .,

11/13/2009 16