ML103330344

E-Mail from Gilanshahi to Gilanshahi, Presentation, Crystal River 3

ML103330344
Person / Time
Site:	Crystal River
Issue date:	09/08/2010
From:	Nikki Gilanshahi NRC/NRO/DE/SEB2
To:	Nikki Gilanshahi NRC/NRO/DE/SEB2
References
FOIA/PA-2010-0290
Download: ML103330344 (21)

Text

Gilanshahi, Nikki From: Gilanshahi, Nikkii*.

Sent: Tuesday, June 08, 2010 3:03 PM To: Gilanshahi, Nikki

Subject:

FW: Presentation Attachments: Crystal River 3.ppt 1-7-2010pdf: Jan 6 Tech Consistency (1).pdf From: Gilanshahi, Nikki Sent Mcnd~ v 1;niiarv 11 2010 2:25 PM To. (b)(6) 1

Subject:

FW: Presentation FYI:

From: Gilanshahi, Nikki Sent: Monday, January 11, 2010 8:47 AM To: Hawkins, Kimberly; Riddick, Nicole; Chakrabarti, Samir; Chakravorty, Manas; Gilanshahi, Nikki; Jeng, David; Kazi, Abdul; Xu, Jim; Chuang, Tze-Jer; Jain, Bhagwat; Ma, John; Park, Sunwoo; Patel, Pravin; Tegeler, Bret; Thomas, Brian; Thomas, Vaughn; Valentin, Milton

Subject:

Presentation Good morning All; Please find attached copy of Jan6 and Jan 7 Crystal River presentation and Please let me know, If you have any questions in this regard.

Thanks, 94onec (301) 415-3801 tnfornia:uQ, i n-acom IIn i"I &.ni W VWs fodjomga 1AL441' I#m I ý Iý IIN:' slow Fowft 2=0-O9L%4 I

USNRC Prt*cti,. People and the /.,ironmr, Crystal River Unit #3 Containment '***[!

elaminatio

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Nikki Gilanshahi StructuralEngineer NRO/DEISEB2 1/7/2010 1

U.S.NRC Pr*l,'.41I.ng Peofple ard thr hidin*otrnin

Purpose:

To educate the staff and make them aware of the recent discovery, Crystal River 3,Steam GeneratorReplacement containment delamination.

Outcome:

Staff can apply the insights from this operatingexperience to our new reactorreviews afterpresentation.

Safety Significance:

Concrete delamination Could compromise the structuralintegrity of the containmentbuilding, which inturn could potentially release radioactivityto the environment.

==

Conclusion:==

Adequate ContainmentDesign review and good quality of Constructioninspection are essentialto ensure safety of our future Nuclear Power Plants.

'I

U.S.NRC N*qj n*'rliýj Peropk an (hhe b.minnimenI Crystal River 3

1. PressurizedWater reactor s Location: Crystal River Florida

1. Commercial Operations Electricity Generationsince 1976 for Florida

• PlannedOutage

• Routine refueling scope Off line maintenance and fuel once every 2years Extended Power Uprate (EPU)- Phase 2 3

'U.SNRC ~pke awl the birmoln~il NaigPro,4fw The most importantroleof nuclearcontainments istoprevent radioactive substances from leaking outactingas*finabararci innuclearpowerplants 4

• ;; U.SNRC Containment Opening Lifting and Rigging Cutting and welding 5

U.SNRC Niertflis 1Prcapi and thr EndvinnunetI Steam GeneratorReplacement Opening Sequence &Identification of elamination 6

cU.SNRC

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Note. Tendon depicton isfor illust*e t A

puoses and isnot an exact scale f

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U.S.NRC Actual Delamination Delaminationand Cause of Delamination Common causes of Delaminationoccurs inreinforcedconcrete structures subject to reinforcement corrosion,inadequate use of concrete material, and more 8

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)U.Sn4P' pea ,uiwNtRC They were Approximately 74 Possible failure mode which 1/3 investigation as of Nov, 20,2009 remaining and ongoing INVESTIGATION APPROACH 9

awl thCa e Prli. Proplo A*nwalrysti Root Cause Analysi's e External Events o Operational Events

, Inadequate Containment I Cutting

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, Inadequate Concrete-tendon 70 interactions

• 1 Shrinkage, Creep and Settlement Chemically or 20 30 Environmentally induced IUr~e Coraeý DF dntor aging I0 I

Inadequate use of Concrete o. ..__I_.....

Materials ~?z z 7zz Tz I 1Z2 6

Inadequate Concrete Construction Inadequate Concrete Design due, to High Local Stress 10

2 U.S,NRC tini I'r*npk and thr Etwirviini,,.

Prplce Condition Assessment Activities Completed or Planned Determine Extent of Condition Characterize the extent of delamination at the SGR opening Determine condition of otherportions of structure s Non Destructive Testing (NDT) of Containment Wall Surfaces Use of Impulse Response (IR) Method Comprehensive on external exposed surfaces Accessible areasinadjacent buildings

• Concrete Cores Used to confirm IRresults (over 80 cores)

Visual examination of core bore holes with boroscopeto identify ifdelaminationpresent s ASME Section Xl IWL visual inspection (affected areas) 0 ContainmentDome Inspections NDT IRscans insegment above the SGR opening Concrete cores with boroscope examination of bore holes Physical survey with establishedbenchmarks 11

'I U.S.NRC Condition Assessment IREquipment o IRPerformed in the Field Primary test method used in this evaluation IL

"U.SNRC PnnletiiZ Propleand the Evrirr*nnrnt Non Destructive Testing (NOT Impulse response (M)method The Impulse Response method can be applied to avariety of situations that require rapid,accurate, and cost-effective nondestructive condition assessment. Which can be used to test relatively rough concrete surfaces; its fast output, Can detect the delamination of concrete &concrete around steel reinforcement,but, itdose not provide the depth of the delamination.

SOUNoD S.AB - Gooo SuPPoRT DELAMINA'TED SLAB

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. FrequencyýHz) V Fr eqency Hz)

High Speed Data /_Higl Speed Data Acquisitlion .

Acquisition ."

Impact Geophone, lone Hammer Hammer 1.1

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SU.SNRC Nea*ii People and ihe EnurminnewI Ground Penetrating Radar GPR Performed inthe (GPR) Equipment Field Locates internal features (rebar, tendon conduits, etc.)

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/U.S.NRC Ground Penetrating Radar Ground PenetratingRadar technology isground radar that acts as atype of ground sonarand provides critical information regarding anything that could be located below the surace. Itis sometimes called ground sonar, Concrete scanning,surface penetrating radar or ground radar

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,U.S.NRC

%*. Proltding Prople and the n'virwrmeinl Concrete Cores Used to accomplish the results and confirm IRresults( Over8O cores)

Visual examination of core bore holes with boroscope To identify ifdelaminationpresent Examination - Inward View Examination - Side View Core 51, Gap I Depth 5.114" Gap 1Width Less than 118"

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N~tectin Prople a~nd the Eniru.rnnment IEEquipment IEPerformed inthe Field Ability to determine depth of delamination 17

.USNRC PNrt it.r I-nple ard ih/e h!wninnffrf Delaminationhas only been observed incore bore holes (s)boroscopic exams inthe buttress 3-4 span, as accuratelypredicatedby IR Red: Core bore with delamination Green :Core bore not delaminated White: To be Core bored I-

-11ý I - II A B C I T Tu!~ne I I I B~d~

Buttress #

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,Concluson -Delan'~nao NS onlY b4nePWedsh c~elore bro *s) bomscooc exanis0(re Mmls 3.4 SpanasuwraelyPrilrd b re 18

U.SNRC Prvoteri. PI*plr and the. :*:invirvirm This Issue isstill under Investigation by a team of Industry experts hired by Licensee.

Possible--Repai'r:

Delamination Removal and Replacement.

Conclusion:

Adequate ContainmentDesign review for New Reactors and good quality of Construction inspection are essential to ensure safety of our future NuclearPower Plants.

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U.S.NRC prohi4-din People and the Efivrunmc',t Questions I~

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