ML102910620

Email - Subject Inspection Questions

ML102910620
Person / Time
Site:	Crystal River
Issue date:	12/03/2009
From:	Lake L NRC/RGN-II/DRS/EB3
To:	Robert Carrion, Masters A, Naus D, George Thomas NRC/RGN-II, Oak Ridge
References
FOIA/PA-2010-0116
Download: ML102910620 (86)

Text

-Masters, Anthony From: Lake, Louis Sent: Thursday, December 03, 2009 12:41 PM To: Dan naus; Masters, Anthony; Carrion, Robert; Thomas, George

Subject:

Emailing: 12-3_All questoins.pdf Attachments: 12-3_All questoins.pdf Categories: Perform Review Here is the latest list of questions and responses. Note that that closed info from this morning's conference call is not included.

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

12-3_AII questoins.pdf 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 f17(0

2009 RC Spci I- ection - RB Concrete Separation 03-Dec-09 9:05:22 AM Request Number: 1 Individual Contacted: Sid Powell Date Contacted: 10/15/2009 Requestorlinspector: Anthony Masters Category: Question Request: There is an area on the containment dome on the south, approximately half way between the walking platform and the peak of the dome that is depressed. There appears to be a grout covering that is seriously deteriorated. Is this evidence of repeat delamination damage?

References:

Response Assigned to: Craig Miller Date Due to Inspector: I 10/16/2009

Response

I was up on the dome earlier this evening to examine the entire dome structure since I also have a Pri 3

.investigation upcoming regarding the condition of the concrete on the dome (reference AR 357670357670. Although it ihad been a number of years since my last visit up there, the overall condition of the dome is pretty much exactly

.the same as it has been in my past trips as part of tendon surveillance. I believe that when they made the re-

.pours of the dome due to the original delamination, the final surface did not end up being a smooth arcing

.curvature and had several localized uneven areas. The one in question is exactly that.

.Furthermore, as part of our ongoing Condition Monitoring of Structures effort (EGR-NGGC-0351), I will be

ýreturning to the dome this evening (10/16/2009) with Dayna Mendez to obtain digital photographs of the area to

.insert into our data base on this subject so that we have a reference point for future inspections.

Misc Notes:

R e s p o n s e By : J oe.Le s e .............................................................................................................

Reviewed By: Date Response Provided:  ! 10/16/2009 Status: Open Date Closed: 1 etAil QuestioPa o 85 Page 1 of

r09 NdC Ipnnspection - RB Concrete Separation 03-Dec-09 9:05:23 AM Request Number: 2 Ind lividual Cul n a t e :

Contacted: i Powell iSid o .ii e i.......

....... Date Contacted: ed .. 10/16/2009 Re questorlinspector: Anthony MastersCaeoy InraioRqus R.questo.The....... I er procedure.that wasCusdrteiong te tendons .has..reque...sted. e.o.r ...........

Request: Tihe Inspector ihas requested a *procecdure th~at wa~s u~se~d forte~ns~ioning .the ten~dons or~igi~nally ........

References:

! l l i !,~ ..

Response Assigned to: ýSid Powell Date Due to Inspector: I 10/16/2009

Response

Prescon Field Installation Manual.tif was placed in folder L:\Shared\2009 NRC SPECIAL INSPECTION TEAM Q-A\POWELL Q-A\Request 2, Original Tendon Tensioning Procedure Aisc Notes:

Response By:

Reviewed By: Date Response Provided:

Open............ ..................

....... .......... Date Closed::...........

Status:

Page 2 of 85

2009 N peci Inspection - RB Concrete Separation 03-Dec-09 9:05:23 AM Request Number: 3 Ind 'ividual Contacted: PaullFagan Date Contacted: 10/16/2009 Re questor/Inspector: George Thomas Category: Information Request Request: George Thomas of the NRC requested a copy of our EC 74801 on the core bores. I printed a copy and delivered to Mr. Thomas at 0900. This is a preliminary copy since the EC has not been issued yet.

References:

Response Assigned to: Glenn Pugh i....................... ..........

... Date Due to Inspector: 10/16/2009

Response

An approved (issued) copy of Revision 1 of the EC 74801 was printed and hand carried to George Thomas on 10/28/09.

Misc Notes: See question #19 for continued submittal of NDE and Core Bore Plan changes.

Response By: Glenn Pugh Reviewed By: Charles Williams Date Response Provided: I. 10/28/2009.

Status: Closed Date Closed: [

Questions iA-;V1 Page 3 of 85

2C 9 RCSpia Inspection - RB Concrete Separation 03-Dec-09 9:05:23 AM Request Number: 4 Individual Contacted: Sid Powell Date Contacted: 10/16/2009 Requestorilnspector: George Thomas Category: Information Request Request: Please provide the concrete mix design and associated material test data for concrete use in original construction of the containment wall. Also provide original test data of production concrete used in the original construction of the containment wall.

References:

Calculation S00-0047 Response Assigned to: Sid Powell Date Due to Inspector: " 0 I. ..2 0. ............

Response

.The RB exterior shell consisted of around 105 separate concrete pours. Attachment B of calculation SOO-0047

shows a listing of these pours by elevation and buttress zone. It also lists the mix design for each pour. For

.example, the SGR containment opening is between buttress 3 and 4 and between Elevations 180' and 220'. Per

.the pour list in the calculation the corresponding pour numbers are 685RB, 695RB, 700RB, 712RB, and 722RB.

'The construction microfiche listing then gives a corresponding microfiche card number for each of these pours.

For example the records for pour number 685RB are on card 1P08022. A typical microfiche card will contain several pages of information including the mix design, batch tickets (truck slips), the date of the pour, curing data, and other relevant data. CR3 Document Services are attempting to scan these cards for use by the NRC

,and Root Cause team. At this time, there are some examples of the pour cards at L:\Shared\Containment Root Cause Files\Requested by NRC. ,A copy of calculation S00-0047 is also included at this location. Document

.Services is attempting to scan the pours between buttresses 3 and 4 (all elevations) first. If a different location is

.required, please let Glenn Pugh

.C.G. Pugh 10/11709 Misc Notes:

Response By: Glenn Pugh Reviewed By: Date Response Provided: I 10/16/2009, Status: Closed Date Closed:

SAIIQuestions Page 4 of 85

AlA 03-Dec-09 9:05:23 AM Request Number: 5 Individual Contacted: Sid Powell Date Contacted: 10/16/2009 Requestornsp or: George Thomas Category: Information Request Request: With regard to the SGR Construction Opening, please provide stress plots of the SGR Opening and surrounding areas for the Dead load + Prestress load combination for the following cases: (i).

prior to tendon detensioning and removal (ii) after tendon removal; (iii) with SGR opening and (iv)

After restoration of opening and tendon retensioning.

a:........ .. . .n .......... ....................................................................................... ......................

References:

Response Assigned to: Sid Powell Date Due to Inspector: 10/17/2009 Respon se:

George asked if we could provide stress plots for the analysis at the SGR opening for the Dead Load + Pressure.

.Load combination at the 4 stages of the SGR project. Unfortunately we did not run computer stress analyses for

.the various load combinations. Each load element (dead load, pressure, liner plate thermal, thermal gradient,

etc.) were individually evaluated. Additionally each were run at unit values, as to support the various amplificatior factors applied to the design basis evaluations. The results of these analyses were then extracted from the structural analysis package and processed, as necessary, to address the load combinations for various building conditions throughout the outage. Unfortunately, the program used does not have the ability to develop stress

.plots.

Misc Notes: Response inadequate. By this question, the NRC is seeking information to understand the structural behavior and response of the Containment Wall under real loads (i.e., Dead +

applicable Prestress Load) in and around the SGR construction opening area for the configurations prior to, during and following creation of the SGR construction opening. Provide the pertinent information in an easily reviewable form. This information may be provided with spendingJopresponse syd..........a to Question 28.

i............................................n........................... . .......... .

Respon*se By: Dan Jopiing ......................... . .

Reviewed By: Date Response Provided: 10/20/2009, Status Open Date Closed:

Page 5 of 85

ŽOOSNRC~~peci L 1U.~B~n r o 03-Dec-09 9:05:23 AM Request Number: 6 Individual Contacted: Sid Powell Date Contacted: 10/16/2009 Requestor/lnspector: George Thomas Category: Question Request: Were the vertical and hoop tendons in the SGR opening area subject to lift-off measurements before detensioning and removal. If so provide lift off measurements. Were the removed tendons inspected/examined and if so what were the findings.

frer ces:

Response Assigned to: Sid Powell Date Due to Inspector: 10/16/2009 Res pone:

INo lift off measurements were made for the tendons that were removed from the opening.

IWL examinations were performed on the concrete and bearing plates for the removed tendons. tendon end

.examinations were performed on the two longest tendons that were non-destructively removed. One wire each

.was removed and examined for the two longest tendons.

Misc Notes: Does CR3 plan on performing tension testing (i.e., ultimate strength, yield strength and elongation) on a wire sample from one or more of the removed hoop tendons that exhibited higher than anticipated loss of prestressing force (i.e., hoop tendons that did not meet the 95%

predicted value criteria in IWL)? This information may be provided with pending response to Question 22.

se By: Sid Powell Reviewed By: Date Response Provided: I 10/16/2009

tatus

Open Date Closed:

Page 6 of 85

2009 NaC Specia Inspection - RB Concrete SepartioI 03-Dec-09 9:05:23 AM Request Number: 7 Individual Contacted: :Garry Miller Date Contacted: 10/22/2009

.. a..................

Requestor/Inspector: ,Dan Naus Category: Information Request Request: Provide de-tensioning sequence in R16 for the construction opening. Provide procedure? Did anyone hear anything?

Follow up request: Documents related to the dome delamination seem to indicate that a loud noise or boom was heard on December 4, 1974, however, no noticeable damage was observed during a subsequent visual inspection. Did anyone hear a loud noise or boom during the detensioning procedure related to the SGR contruction opening?

References:

Response Assigned to: Charles Williams Date Due to Inspector: 1 10/26/2009 1

Response

R1 6 Tendon Detensiong sequence.ppdf: {E-mail from the SGR Tendon Field Engineer on the detensioning

,sequence.}

'Containment Opening - Tendon Removal Timeline.xlsx: {Spreadsheet containing some interview questions and responses as well as some plant shutdown/mode times and tendon detensioning sequence information.}

.Z3R5 PSC Field and Quality Control Manuall.pdf: {PSC Procedures [ALL], F&Q 8.0, 8.1, and 10.0 specifically address Tendon Detensioning/Removal, Plasma Tendon Detension, and Tendon Removal}

Misc Notes:

Response By: Rick Portmann Reviewed By: Date Response Provided: 11/2/2009:

Status: Open Date Closed:

rptAlI QuestoPns Page 7 of 85

2009 NRC Special Inspection RS B Concrete S:p tion 03-Dec-09 9:05:23 AM Request Number: 8 Individual Contacted: GarryMiller Date Contacted: 10/22/2009 i Requestor/Inspector: 'Dan Naus Category: Information Request Request: Any information on significant repairs (concrete related) between buttress 3 and 4 from original construction to today.

References:

Response Assigned to: Charles Williams Date Due to Inspector: 1 10/26/2009

Response

.Performed a search of the document control system, both the SEEK system and historical QA records. Looked

,for any Work Orders, NCRs, Correspondence, or other documents using the keywords "concrete repair" and

'concrete crack." There were several "hits" on these key words. The majority of these "hits" were screened

.away by reviewing the title of the document. Any "hits" where the title was not clear were reviewed individually.

.The results were several AR's and Work Orders to repair damaged or cracked concrete on the RB containment.

.However, none of the items reviewed were in the area of concern. Document search summaries are here:

L:\Shared\CR3 Containment\NRC SIT Team Questions & Info\Request 8, Q2 Response Info- Pugh

.In addition, conversations were held with several people in maintenance and engineering, including one person

.that was employed in the early 1970's. No one could remember making any repairs on the RB shell concrete in the area of interest. No modifications could be identified. Conclude that the concrete between buttress 3 and 4 is original construction.

Mis c Notes:

Response By: Glenn Pugh Reviewed By: Chales Williams Date Response Provided: 10/28/2009 Status: Closed Date Closed:

rptAlI Questions Page 8 of 85

2009 NRC Special Inspection - RB Concrete Separation 03-Dec-09 9:05:23 AM Request Number: 9 Individual Contacted: Garry Miller Date Contacted: 10/22/2009 Re.u.st.r/.nsp.u.............s Requestor/inspector: iDan Naus Category: Question Request: Was there any analysis of why re-tensioning was required in past tendon surveillance activities (done at that time of surveillance testing)?

lollow up request: Since lower than expected lift-off loads have been obtained in the recent 3 tendon surveillanceds for a significant number of horizontal tendons, describe your plan, if any, to.

dtermine, evaluate and eliminate the cause(s) of the condition not meeting the IWL acceptance by examination criteria.

References:

Response Assigned to: Charles Williams Date Due to Inspector: I 10/26/2009

Response

There was no analysis performed during past surveillance testing years in which tendons were re-tensioned.

Additional information in response to the above question: See License Request No. 24 - NRC SIT Question# 1E folder, under sub-folder: "IWL - Tendon Surveillance History" for information, discussions and actions taken n ~ ..lift-off

£ .ttendon

.[e..a1..to

,related e s~i ? . andd [re-tensioning.

!!f : [ ..testing ~ er s ~o n...........

iri ........................................................

Misc Notes:

Response By: R.ickP.ortmann................................................

Reviewed By: Date Response Provided: 11/2/2009.

Status: Open Date Closed:

Page 9 of 85

2009 NRC Special Inspection - RB Concrete Separation 03-Dec-09 9:05:23 AM Request Number: 10 Individual Contacted: 'Garry Miller Date Contacted: 10/22/2009 Requestor/Inspector: Dan Naus Category: Question Request: When CTL is using IR and IE, can they determine relative concrete quality of locations tested as part of CTL NDE procedures?

References:

Response Assigned to: Paul Fagan Date Due to Inspector: i 10/26/2009

Response

,In general, the Impulse Response (IR) test results is influenced by concrete quality and existence of defects at

the test point. The aspects in concrete influencing IR results include presence of delamination, cracking,

.significant void or honeycomb and change in concrete properties. The most significant factor is the presence of delamination which effectively reduces the thickness of wall or slab responding to the impact. Considerable idifference in quality of concrete is typically reflected in the test results. For example, a core removed from panel

'RBCN-0014-N (Core #13) where a higher mobility value was obtained by NDT, had less coarse aggregate in

.the concrete, which changed density and modulus in that localized area, no delamination was noted in these

.areas with subsequent boroscope examinations.

Misc Notes:

Response By: Paul Fagan Reviewed By: Date Response Provided: 11/12/2009 Status: Closed Date Closed:

rptA11 Questions Page 10 of 85

2009 NRC Special Inspection RB Concrete Separation 03-Dec-09 9:05:23 AM Request Number: 11 Individual Contacted: Garr Miller Date Contacted: 10/22/2009 RIn eq specto uesto r r:................

k ......

.. C ateg o ry ..............

i...... .............

.... Q e to n....................

Requestor/inspector: LusLake Category: Question Request: Does the PGN Testing Procedure identify how CTL calibrates their equipment, qualification of personnel, and equipment set-up (i.e., frequencies)? Provide Testing Procedure to NRC.

References:

Response Assigned to: :PaulFagan Da.te Due to Inspector: 10/26/2009

Response

This question pertains to PGN procedure PT-407T, Reactor Building Concrete Examination and Testing, Revision 2.

The question is split into three areas with specific procedure steps stated to address each area.

Area 1 - Calibration Step 3.2 Responsibilities

.Step 3.2.1

'The Condition AssessmentConsultant is responsible for:

Provide equipment list and associated calibration documentation

'Step 3.3 Limits & Precautions Step 3.3.2

The equipment utilized to perform the NDT was calibrated in the field during trial use by CTLGroup. This method' of validating the test process and equipment for a specific application is standard practice for concrete condition

.assessments utilizing NDT.

.Step 5.3 Reports

,Step 5.3.1 An equipment list with calibration documentation will be provided for the NDT used. The NDT process calibration/validation document will be included in the report.

.Enclosure 7

'For a critical structure of this scale, more correlation data is desired in order to finalize a more comprehensive

,calibration, Enclosure 8 Individual equipment packages have been established to track specific calibrated equipment in order to link

.individual NDT locations with a calibrated equipment package. The Exterior Containment Inspection Log

,requires an Equipment Package Number to be recorded for each NDT location. The Equipment Package Number is traceable to a permanent plant record documenting the calibration records for the equipment.

'Area 2 - Qualification Step 3.2 Responsibilities Step 3.2.1

The Condition Assessment Consultant, CTLGroup, shall be responsible for assuring that all individuals under his supervision are properly trained in the use of this procedure and associated equipment.

,Step 3.2.1 The Condition Assessment Consultant is responsible for:

Provide personnel qualification records for lead Engineer

.Step 3.5.2 Initial Conditions ENSURE that all personnel are familiar with the operating manuals of the equipment to be used during the iinspection.

rptAil Questions Page 11 of 85

2009 NRC Special Inspection Concrete Separation 03-Dec-09 9:05:23 AM

.Step 5.3 Reports

Step 5.3.1

.The report will include personnel qualification records of lead engineers who performed the NDT.

.Area 3 - Equipment set-up

Step 3.2 Responsibilities

.Step 3.2.1

.The Condition Assessment Consultant is responsible for:

.Provide calibration/validation documentation to substantiate the NDT methods to be used and to support the

,dedication of the software (SMASH) being used to evaluate the NDT data.

,Step 3.3 Limits & Precautions Step 3.3.2

.The equipment utilized to perform the NDT was calibrated in the field during trial use by CTLGroup. This method

.of validating the test process and equipment for a specific application is standard practice for concrete condition assessments utilizing NDT.

Enclosure 5, page 1 TURN ON the computer to start setup process.

Enclosure 6, page 1 ITURN ON the computer to start setup process.

Misc Notes:

Response By: Paul Fagan Reviewed By: ~Date Response Provided: - /220 Status: Open Date Closed:

rmAW1 Questions Page 12 of 85

2O9' NRC Special Inspection - RB Concrete Sepaar t-n 03-Dec-09 9:05:23 AM Request Number: 12 Individual Contacted: ,Garry Miller Date Contacted: 10/22/2009 Re(questorinspector: uan rJaus Category: Question Request: Once the construction opening is refilled with concrete, how and for how long will the concrete be.

allowed to cure, and what is decision process for start of post-tensioning the structure?

References:

Response Assigned to: Don Dyksterhouse Date Due to Inspector: 10/26/2009_-

Response

Response located in L:\Shared\2009 NRC SPECIAL INSPECTION TEAM Q-A\DYKSTERHOUSE Q-A Misc Notes:

Response By:

Reviewed By: Date Response Provided:

Status: Open Date Closed:

rtAAl Questions Page 13 of 85

2009 NRC Special Inspection - RB Concrete Separation 03-Dec-09 9:05:23 AM Request Number: 13 Ind lividual Contacted: ýGarry Miller Date Contacted: 10/22/2009 Recquestor/Inspector: ...........................................................

George ..................................................................

Thomas.............................................

........................ Category: Question Request: Before additional tendons are de-tensioned, will there be as-found lift off measurements taken for:;

these tendons.

References:

ResseponA s s i..........: . a ....

e s w.....................

........ Da e ue t n p c o : !.......1 2 6 2 0 . ...

Response Assigned to: Charles Williams Date Due to Inspector: 10/26/2009

Response

Planning and scheduling are currently in progress to obtain lift-off measurements of some of the tendons which

,are going to be detensioned. The root cause team has requested lift-off data on vertical tendons 34V3 thru 34V7

& 34V18 thru 34V22 and horizontal tendons 42H22 thru 42H26 & 42H35 thru 42H39.

See lift-off -data provided in Request 6 response.

Misc Notes:

Resp'onse By: Rick Portmann Reviewed By: Date Response Provided: 11/4/2009, Status: Closed Date Closed:

rptAil Questiornis Page 14 of 85

2009 NRC Special Inspection - RB Concrete Separation 03-Dec-09 9:05:23 AM Request Number: 14 Individual Contacted: :Garry Miller Date Contacted: 10/22/2009 i .......

S..............................................................................................................................................

Requestor/.nspector: Dan Naus .Category: Q ution Request: For the original structural integrity test, were there any strain gauges in the SGR opening area or near it?

References:

Response Assigned to: Charles Williams Date Due to Inspector: 1 10/26/2009

Response

Section 5.3.2 of the Dome Repair report included with Letter 3F1 276-10 outlines where the strain gauges were attached.

In addition to the final report, Attachment 1 to Supplement number 2 (transmitted via letter 3F1076-05) contained

a detailed listing of strain gages for the SIT. The construction opening is centered on azimuth 150o (between buttresses 3 and 4) from Elevations 180' to 210'. The listing in Attachment 1, does not show any gages in this

,area. The closest would be at azimuths 90o and 200o at Elevation 204' (gages 13, and 15).

The SIT report (GAI Report 1930, dated 12/7/76) contains radial displacements for these gages (See Appendix

B, Page B-5 of the GAI report).

.Documents for this response are located here: L:\Shared\CR3 Containment\NRC SIT Team Questions &

lInfo\Request 14, Q8 Response Info- Pugh Misc Notes:

Response R sesponBy: Glen By: G!.Ctn.PPugh ~u gh............. .................... .....................................

Reviewed By: Charles Williams Date Response Provided: 10/28/2009 Status: Closed Date Closed:

rpkAll Questorns Page 15 of 85

2OO9 NRC Special Inspection - RB Concrete Sepr tion 03-Dec-09 9:05:23 AM Request Number: 15 inadividu ce d l.......... M ....

.~ry e ............................

D t o t c e : " 1 / 2 0 9:......

Individual Contacted: Garry Miller .. .......

Date Contacted: 10/22/2009 Request: whena)swat!*e 1976 th~e- £o n~~~~~~~~~~...........e.._d f e r t i t eissue roof delamination o ~occurredl

~ m ..... n.....................................................................................

ewas s sth~ere t~ anyeevaluation of th~e rest of ......... . .

containment, including a "notch sensitivity" review? Refer to the FPC Final Report Page # 110.

Response Assigned to:.c.arleswiliams .Date Due to Inspector: 10/26/2009

Response

Misc Notes:

Response By:

Reviewed By: Date Response Provided:

Status: Open Date Closed:

mtAtl QuestiorP Page 16 1 of 85

2009 C ec- Inspection - R Concrete Separation 03-Dec-09 9:05:23 AM Request Number: 16 Individual Contacted: Garry Miller Date Contacted: 10/22/2009 Re..s....pe c.......i..

Requestor/inspector: Louis Lake ke ...................................................................................

.. C a t g o r................r.....a...o....q..s............

Category: Information Request Request: Discuss the planned NDE method, its reliability, industry experience, and other pertinent information.

B) Discuss supplementary verification plans to ensure results are.. ... .........................

reliable. .....................

References:

Response Assigned Rsep oigs eAe d to to: iPaul a u iFagan a g n ................................................................... D a te D.eto.ns Date p.to..*........... 10/216/2009 Due to. Inspector: .............. ............... i

Response

A)impulse Response (iR) test was chosen as th.e primary NDT tec.nique o extent

.evaluateth. of dieamination..

The IR method uses a low strain impact from a hammer equipped with a load cell to send a stress wave through the element under test. The response to the input stress is measured using a velocity transducer (geophone).

.Both the hammer and the geophone are linked to a portable field computer for data acquisition and storage. Time

.records for both the hammer force and the geophone velocity response are transformed into the frequency domain using the Fast Fourier Transform (FFT) algorithm.

Average Mobility is the key parameter that the dynamic IR test produces. It is defined as the structural surface velocity responding to the impact divided by the force input [(m/s)/N]. The mean mobility value over the 0.1-1 kHz:

,range is directly related to the modulus, density and the effective thickness of the element. In general, presence of significant voiding or an internally delaminated or un-bonded layer will result in an increased average mobility

.value. On the other hand, a sound concrete element without distress will produce a relatively low average mobilit;

.value. The test results can be analyzed and presented in the form of contour plots. The suspect areas can be

'identified through a scaled color scheme.

.Comparing to another well-known NDT method Impact-Echo (IE) test, the IR test uses a compressive stress

.impact approximately 100 times that of the IE test. This greater stress input means that the plate responds to the IR hammer impact in a bending mode over a very much lower frequency range (0-1 kHz for plate structures), as

.opposed to the reflective mode of the IE test which normally requires a frequency range of approximately 5 to 30

.kHz, The influence of reinforcement and tendons in the structure has generally less impact than it would for IE test, while delamination at relatively shallow depth, if any, will dominate the signal response in IR testing. It makes it ideal to evaluate the presence of delamination without having to layout locations of tendon and

,reinforcing bars prior to the testing in a time critical project. However, the IR test cannot detect with high certainty;

.the absolute depth of delamination; rather it's on a comparative basis. The width or size of crack cannot be

.determined in the IR testing.

The IR test method has been used to evaluate concrete structure condition in the past 20 years. The test method!

is in the process of being standardized by ASTM. CTLGroup has extensive experiences in utilizing this method to

.characterize defects in concrete. IR test has been used in evaluating concrete structures in both nuclear and fossil power plants. CTL Group experience for nuclear related structures has been compiled (see attached).

B) According to the Progress Energy procedure PT-407T, Rev. 2, concrete core samples are removed in areas

.with high mobility values (greater than 1.0) to confirm the presence of delamination. Core samples are also

.removed in areas where mobility value is in the "Gray" (between 0.4 and 1.0) range to verify the condition, unless

.the slightly elevated values can be dispositioned through evaluation. Many cores have been removed based on

ýthe IR test results along the boundary of delamination in the section where steam generator opening is located.

At this time, the approximate 20 cores so far removed indicated the IR results have been accurate in characterizing the extent of delamination in the steam generator opening area. Also according to the test

.procedure, a population of core samples is also removed from areas where low mobility values (less than 0.4)

,are obtained to confirm the sound concrete condition. Based on the core samples removed, the IR results have

.been accurate to detect a delamination in the concrete.

rptAil OQuestbon Page 17 of 85

2O NRCSp i Ilnspection - RS Concrete Separation 03-Dec-09 9:05:23 AM Misc Notes:

Response By: Paul Fagan Reviewed By: Date Response Provided: 11/12/2004 Status: Open Date Closed:

rmAil QuzestiPn, Page 18 of 85

2009 NRC Special Inspection - Concrete Separation 03-Dec-09 9:05:23 AM Request Number: 17 Individual Contacted: :Garry Miller Date Contacted: 10/22/2009 Requestor/Inspector: lGeorge Thomas S...........................

.I. ..-.-..

... .... . Category: Question Request: For petrographic analysis, who are the labs and what are their credentials?

Follow up Request: Provide information on the qualification of the petrographers from CTL and Photometrics --who t -f--.........

e .. .. aare reel- performing/supervising

....---- r s.. .s .gpetrographic

- - u .r. i.-

r.... et........a examination mr.r.. work for CR3.

.3 ..........

References:

Response Assigned to: :Paul Fagan Date Due to Inspector: 10/26/2009

Response

Two labs have performed petrographic analyses in accordance with ASTM C 856: MACTEC Engineering A&Consulting and CTL Group. MACTEC performed petrographic analysis under their Appendix B

ýprogram, while CTL performed an informational "comparison" analysis as an additional, independent

.data point. The resume and qualification package of the Mactec individual who performed the analysis for CR3 is attached, as well as the CTL analyst's resume and petrography literature from the CTL website.

A third laboratory, PhotoMetrics, is also performing material analysis, although not per the ASTM standard. The material examinations being performed by Dr.Mostafa at the PhotoMetrics laboratory

.involve methods intended to examine similar conditions and attributes evaluated under petrographic

.examinations, but using tools and techniques more frequently used in material science, e.g., scanning electron microscope (SEM) and micro-hardness examinations that are more thorough. Information

.from the PhotoMetrics website is attached.

Misc Notes:

Response By: Craig Miller Reviewed By: Date Response Provided: 11/18/2009, Status: Open Date Closed: ]

mtAll Questions Page 19 of 85

2009 NRC Special Inspection- ;B Concrete Separation 03-Dec-09 9:05:23 AM Request Number: 18 Individual Contacted: ýGarry Miller Date Contacted: 10/22/2009 Requestor/Inspector: .George Thomas Category: Question Request: How are core samples being processed and sent to the labs for petrography?

A) How will you determine that the results are consistent between the labs?

Follow up Request: Please expand your response on the quesiton of determining consistency of results between the labs. This may be provided with response to new quesiton .. below.

References:

Response Assigned to: Paul Fagan Date Due to Inspector: 10/26/2009

Response

Each of the cores used for petrographic analysis was obtained with a 4" diamond core bore bit, sealed in aluminum foil and plastic, wrapped in bubble wrap, and packaged in wooden crates. The packages were shipped via Fedex for overnight delivery. Chain of Custody forms are used to track each core. Cores #5

.and #7 were sent to MACTEC for analysis. MACTEC cut core #5 longitudinally and sent half to CTL. Core

1. 6 was sent to PhotoMetrics using the same process.

The labs are each performing independent analyses. The primary goal of the analyses was to estimate

.the relative age of the cracked surface. Each lab was given this objective when the work was authorized.

Final reports will be issued with results.

Misc Notes:

Response By: Craig Miller Reviewed By: Date Response Provided: 11/18/2009 Status: Open Date Closed: .. . ....

,mAIlQuest'ons Page 20 of 85

2009 RC Special Insp ection - RB Concrete Separation 03-Dec-09 9:05:23 AM Request Number: 19 Individual Contacted: Garry Miller Date Contacted: 10/22/2009 Requestor/Inspector: George Thomas Category: Question Req

-sa uesm t isitep an l~o N I* a ncl- o resa pie s ...........................................................................................................

whiing Request: What is the sampling plan for NDE and core samples,

References:

Rsese~..........

p on u..gn...............................................Dt..et.ns e t r ' ........... 0................

2 6 2 0 ..

Response Assigned to: ýPaul Fagan Date Due to Inspector: 10/26/2009

Response

The nondestructive testing (NDT) and core bores are being executed based on the requirements specified by the Root Cause Team in support of the root cause analysis, design basis evaluation, and repair requirements. NDT is performed on the exposed surfaces of the containment in each of the six bays, where a bay is defined as the area between each of the six buttresses. NDT is also planned to be performed on the dome surface and, is in

.progress on the containment walls accessible from withinadjoining buildings such as the Auxiliary Building,

.Intermediate Building, and the Fuel Transfer Building.

Exposed Surfaces

'Exposed surfaces accessed via work platforms, scaffolding, ladders, and roofs of adjoining buildings are iincluded in the condition assessment of structure. A small percentage of the overall surface area of exposed surfaces has physical constraints that make acdess impractical.

Adjoining Building Surfaces

.Surfaces within adjoining buildings are accessed via permanent platforms, scaffolding, and ladders included in

,the condition assessment of the structure. A large percentage of the accessible surfaces are included in the plan; however, physical constraints exist in each of the three adjoining buildings that limit access. Examples are

.1) areas with wall attachments that limit access to the concrete surface, 2) locked high radiation areas, and 3)

.contaminated areas.

Core Bores The location and number of core bores is defined by the on-going NDT results and input from the Root Cause Team. Core bores are taken to provide samples for concrete testing. Cores in both solid and delaminated areas characterized by NDT are used to confirm the test results. Core bores have been drilled around the perimeter of the delamination in the bay between buttresses 3 and 4 to confirm the boundary of the delamination characterized by NDT.

M i scN o te s : ~ ~~............. ...........

Misc Notes:

Response By: Paul Fagan Reviewed By: Date Response Provid.ed: 1 11/12/2009.

Status: Open D.ate Closed:

rotAOl Questbons Page 21 of 85

2009 NRC Special Inspecti-n - RB Concrete Separation 03-Dec-09 9:05:23 AM Request Number: 20 r ...........

Individual Contacted: Garry Miller Date Contacted: 10/22/2009 Requestorllnspector: George Thomas Category: Question Request: What are your examination plans for below grade?

References:

Response Assigned to: Paul Fagan Date Due to Inspector: 1, 10/26/2009

Response

The containment exterior concrete surfaces not exposed to the elements are accessed from within the Auxiliary, Intermediate, and Fuel Transfer Buildings. The containment wall rests on the foundation mat. The top surface of the foundation mat is at EL. 93'-0" (ref. drawing 421-004). No portion of the containment wall is inaccessible due to concrete being in contact with backfill (below grade). Surfaces within adjoining buildings are accessed via

permanent platforms, scaffolding, and ladders are included in the condition assessment of the structure. A large

,percentage of the accessible surfaces are included in this assessment; however, physical constraints exist in each of the three adjoining buildings that limit access. Examples are 1) areas with wall attachments that limit access to the concrete surface, 2) locked high radiation areas, and 3) contaminated areas.

Misc Notes:

Response By: Paul Fagan Reviewed By: Date Response Provided: 11/12/2009, Status: Open Date Closed:

rptAll Questions Page 22 of 85

2009 NRC Special Inspection - B'I Concrete Separation 03-Dec-09 9:05:23 AM Request Number: 21 Individual Contacted: aryMiller Date Contacted: 10/22/2009 S. .. ... . . . ......

........... ............ .. . . ............ .. .. ..... ...... i ................................ ....... ... . . .... -

r................................................................................................. Ca.........................................................................

Requestor/Inspector:Re uetoiGereThomasCaeo:

tl eo.g~

sp c t r ..T~o rn~s............ . .. ... . at g o y : InomtnRqus

[.......................n.o.r. . .....

..... 0 e......................

u s Request: Provide interview observations from personnel involved with hydro-demolition and detensioning/cutting of tendons (when their comments note something of interest).

Provide information from additional interviews of personnel when they become available. Also, include interviews conducted by P11.

References:

Response Assigned to: Charles Williams Date Due to Inspector: 10/26/2009.

Response

Response located in L:\Shared\2009 NRC SPECIAL INSPECTION TEAM Q-A\WILLIAMS Q-A\Request 21, 015 Response Info - Portmann Misc Notes:

Response By: Charles Williams Reviewed By: Date Response Provided:

Status: Open Date Closed:

rl)[Ail Qe in Page 23 of 85

2009 NRC Special Inspection - RB Concrete Separation 03-Dec-09 9:05:23 AM Request Number: 22 Individual Contacted: Galrry Miler Date Contacted: 10/22/2009 t......

Requestor/Inspector: George Thomas Category: Question Request: Have removed tendons been inspected and were there any significant findings?

Does CR3 plan on performing tension testing (i.e., ultimate strength, yield strength and elongation) on a wire sample from one or more of the removed hoop tendons that exhibited higher than anticipated loss of prestressing force (i.e., hoop tendons that did not meet the 95%

predicted value criteria in IWL)?

References:

Response Assigned to: Charles Williams Date Due to Inspector: i 10/26/2009

Response

There was no requested/required inspections performed of the removed tendons. Various questions were asked of the SGR Tendon Field Engineer and PSC Lead Individual, responses documented in the enclosed.

{Containment Opening - Tendon Removal Timeline.xlsx}

{10 28 interview Cliff Peters Gary Goetsch.pdf}

{lnterview with Gary Goetsch.pdfe Misc Notes:

Response By: Rick Portmann Reviewed By: Date Response Provided: 11/12/2009, Status: Closed Date Closed:

rmtAU*t QuestionsPae2of8 Page 24 of 85

03-Dec-09 9:05:23 AM Request Number: 23 Individual Contacted: Garry Miller Date Contacted: 10/22/2009 Req es or/nspector: George Thomas Category: Question Request: When were observations of surface feature changes and water leakage noted below the construction opening?

At what location of the SGR opening area did hydro-demolition begin and what was the sequence of progression for the creation of the opening?

Provide a copy of NCR 358724 that identified voids in the RB concrete in the area of hydro-demolition.

References:

Response Assigned to: Charles Williams Date Due to Inspector: 10/26/2009

Response

~ ..

'The below is the timeline of events as noted in the Outage Autolog system (relevant Autolog

• pages attached):

.10/1/2009 4:28:59 AM Begin hydro-demolition 10/1/2009 1:15:08 PM Hydro-demolition to first layer of rebar is complete, begin cutting rebar 10/2/2009 3:55:53 AM Restart hydro-demolition

10/2/2009 5:15:30 AM Stream of water identified exiting RB wall from below/to the right of the

'transfer opening. Hydro-demolition suspended.

10/2/2009 6:41:11 AM Voiding identified in RB wall

.10/7/2009 12:52:15 PM 2 ft x 4 ft loose concrete below the containment opening.

.Copy of NCR 358724 also provided in L:\Shared\2009 NRC SPECIAL INSPECTION TEAM Q-A\WILLIAMS Q-

.A\Request 23, Q17 Response Info - Miller Misc Notes:

Response By: Charles Williams Reviewed By: Date Response Provided: 11/18/2009 Status: O pennD............... .op ate C.

C losed : I .... ....

Page 25 of 85

O09 *-RC Spe& ap :setion R Coac et Sep ration 03-Dec-09 9:05:23 AM Request Number: 24 Individual Contacted: Garry Miller Date Contacted: 10/22/2009 Req storllnspector: George Thomas Category: Question Request: What were results of the last three IWE/IWL surveillance reports (provide actual complete reports)?

Provide inspection procedures and including qualification of personnel information?

References:

Date Due to Inspector: i 16i0/26/22009 ,

Response Assigned to: .Charles Williams

Response

Response located in L:\Shared\2009 NRC SPECIAL INSPECTION TEAM Q-A\WILLIAMS Q-A\Request 24, Q18.

.Response Info-Portmann iisc Notes:

oSe By: Charles Williams owd By: Date Response Provided:

Statuw Closed Date Closed:

tAll Page 26 of 85

Ai Lp; io R3 ncet r tk H 03-Dec-09 9:05:23 AM Request Number: 25 Individual Contacted: Garry Miller Date Contacted: 10/22/2009 Req uestorinspector: George Thomas Category: Information Request Request: Provide results of current visual inspections.

Response Assn ed to: Paul Fagan Date Due to Inspector: 10/26/2009

Response

In response to your E-Mail Clarification on 11/30/09 for information regarding "all IWL examinations, being performed during this (R16) outage, "to let you know there were no scheduled As-Found IWL examinations for

.this outage as they are performed every 5 years and were performed last in outage R15 (2007) [that information

.has been provided to you under NRC Folder "WILLIAMS Q-A" file "Request 24, Q18 Response Info-Portmann"].

The only IWL examinations scheduled are the As-Left Pre-Service IWL exams to be performed prior to, during, and following the ILRT on the repair/replacement area which is yet to be completed.

However as a result of the containment crack we did an augmented IWL scope between buttresses 3-4 to compare to the R15 information as part of the root cause investigation. I have included these reports, reference file RO-16 IWL Exam Reports.pdf enclosed in the NRC folder "FAGAN Q-A" file "Request 25, Q19 Response Info".

'The SGR-QC also performed visual inspections of the tendon ends, bearing plates and surrounding concrete for those tendons affected by the containment opening Engineering Change (EC). These inspections were not required lAW IWL.

'Rev. 1: The SGR-QC examination reports ( File: Tendon Bearing Plate and Concrete Inspections.pdf) has been provided in this NRC folder.

Misc Notes.

Response By: Rick Portmann Reviewed By Date Response Pr( ed: 11/30/2009, Open Date Closed: 1 Page 27 of 85

0 ~CS~~c>~i ~ir~ctio , Coric~t ~rr io 03-Dec-09 9:05:23 AM Request Number: 26 Individual Contacted: Garry Miller Date Contacted: 10/22/2009 Q u estio Requestor/Inspee Louis Lake Category:

Request: Will PGN be doing the overall IWL inspection this R16 outage concurrent with ILRT?

References:

Response Assigned to: Paul Fagan Date Due to Inspector: 10/26/2009 Resnonse:

The IWL Inspections required by ASME Section XI are required every 5 years. CR3 last performed this inspection in R1 5 (2007). During R1 6 the ASME Section XI Repair / Replacement requirements require that a Pre-Service ISI VT examination be performed on the containment opening repair area prior to, during and following the ILRT. In support of the containment root cause it has been requested that an Augmented IWL Visual Examination be performed on the containment between Buttresses 3 and 4. This Augmented area includes the tendon gallery and the vertical face of containment only.

Resose Bote.i R enspons By: Rick Portmann R eviewed By: Date Response Provided: ' 11/4/2009.

Status: Open Date Closed:

• ,I Page 28 of 85

2009 NRC Special Ins ection - RB Concrete Separation 03-Dec-09 9:05:23 AM Request Number: 27 Ind lividual Contacted: GayMiller Date Contacted: 10/22/2009 Re questor/Inspector: George Thomas

.... a t e g o ry :

C..

C Q e to Question Request: What was technical analysis for decision to detension only specific tendons? Provide the analysis?

References:

R e s..........

nd o : C a l s W i la s;..............................................

Response Assigned to: ....................................

Charles Williams. . . .. ... ..................... D a e Due Date u.t.Isto Inspector:

p c or I .......1.2 62. 9...........

10/26/2009

Response

Misc Notes:

Response By:

Reviewed By: Date Response Provided:

............. e o ed :

Open Date Closed:

Status:

rpwAll Questions Page 29 of 85

2009 NRC Special Inspection - RB Concrete Separation 03-Dec-09 9:05:23 AM Request Number: 28 Individual Contacted: !Garry Miller Date Contacted: 10/22/2009 i Requestor/Inspector: 4George Thomas Category: Question Request: What were forces acting on SGR opening area and adjacent areas:

A) Prior to tendon de-tensioning and concrete removal?

B) After de-tensioning and tendon removal?

C) After detention and concrete removal?

By this question, the NRC is seeking information to understand the structural behavior and response of the Containment Wall under real loads (i.e., Dead + applicable Prestress Load) in and around the SGR construction opening area for the configurations prior to, during and following creation of the SGR construction opening. Provide the pertinent information in an easily.

reviewable form.

References:

Response Assigned to: Don Dyksterhouse Date Due to Inspector: _10/26/2009

Response

.Refer to Calculation S09-0048 stress plots. These plots are for dead load + vertical and hoop prestress as

.requested by George Thomas.

References:

1. Calculation S09-0048, Revision 1, Stress Plots for SGR Containment Analysis Misc Notes:

Response By: Don Dyksterhouse Reviewed By: Date Response Provided:

Status: Open Date Closed:

rptAfl Oulestiorns Page 30 of 85

2009 NRC Special Inspection - RB Concrete Separation 03-Dec-09 9:05:23 AM Request Number: 29 Individual Contacted: Garry Miller Date Contacted: 10/22/2009 Req Lestor/Inspector: .George Thomas Category: Question Request: How were the forces acting on the buttress analyzed when the horizontal tendons were released and the forces became unbalanced?

References:

Response Assigned to: Don Dyksterhouse Date Due to Inspector: 10/26/2009

Response

• The unbalanced force(s) and moments from detensioning hoop tendons were evaluated for Buttress numbers 2, i3, 4 and 5 (Ref. 1, Pages 90 thru 95) and these forces and moments were applied to the appropriate nodes along the centerline of each buttress. Note that the forces and moments shown on pages 90 thru 95 of Ref. 1 are in thei

direction of the tensioned tendon. When these tendons are detensioned the signs reverse (Ref. 1, Attachment 2,

.load cases 6 and 10 and load combinations 102 and 104). The unbalanced forces are derived from the original lock-off stress - tendon losses at the time of the steam generator replacement outage (Ref. 2, Section 4.2.1.2).

References:

11. Calculation S06-0005, Revision 1, Containment Shell Analysis for SGR - Shell Evaluation During Replacemei Activities.

.2. Calculation S06-0004, Revision 0, Containment Shell Analysis for SGR -Properties of new Concrete for Access Opening and Number of Hoop and Vertical Tendons to be Detensioned.

Misc Notes:

Response By: Don Dyksterhouse Reviewed By: Date Response Provided:

Status: Open Date Closed:

rptAll Ques'pons Page 31 of 85

2009 NRC Special Inspection - RB Concrete Separation 03-Dec-09 9:05:23 AM Request Number: 30 Individual Contacted: Garry Miller Date Contacted: 10/22/2009 Requestor/Inspector: George Thomas Category: 10/22/09 Request: Where is PII based, and provide a description of their credentials?

A) What is their root cause approach?

Provide P11's failure mode chart referred to in item (5) under the title, "Unique Qualification" of the response.

Identify the root cause failure analysis report for the MOX facility referred to in Item (6) under the title "Unique Qualification" of the response, if submitted to the NRC, or provide a copy of the report.

References:

Response Assigned to: Charles Williams Date Due to Inspector: 1 10/26/2009

Response

'PII location, background, qualification and methods were reviewed with George Thomas. A hard copy of the

,response was provided and discussed on 10/28/09. Electronic copy of this file is in L:\Shared\2009 NRC

SPECIAL INSPECTION TEAM Q-A\WILLIAMS Q-A\Request 30, Q24 Response Info - Williams Misc Notes:

Response By: Charles Williams Reviewed By: Date Response Provided: 10/28/2009 Status: Open Date Closed:

rptAil Questions Page 32 of 85

2009 NRC Special Inspection - RB Concrete Separation 03-Dec-09 9:05:23 AM Request Number: 31 Individual Contacted: .Garry Miller Date Contacted: 10/22/2009 Requestor/Inspector: George Thomas Category: Question Request: What are the various root causes and fault tree scenarios being considered?

Provide a list of root cause failure modes being considered under each of the 9 broad categories (i.e., break down each of the 9 categories into the approximately 79 failure modes being evaluated for CR3 containment).

References:

Response Assigned to: Charles Williams Date Due to Inspector: . 10/26/2009

Response

.A listing of potential causes categories and examples were reviewed with George Thomas. A hard copy

.response was provided and discussed with George Thomas on 10/28/09. Electronic copy of this file is in L:\Shared\2009 NRC SPECIAL INSPECTION TEAM Q-A\WILLIAMS Q-A\Request 31, Q25 Response Info -

Williams Misc Notes:

Response By: Charles Williams Reviewed By: Date Response Provided: [ 10/28/2009, Status: Open Date Closed:

rptAll Questions Page 33 of 85

2009 NRC Special Inspection - RB Concrete Separation 03-Dec-09 9:05:23 AM Request Number: 32 Individual Contacted: Garry Miller Date Contacted: 10/22/2009 1 Requestor/inspector: George Thomas Category: Question Request: When and what will be the deliverable for the NRC to review, i.e., schedule for root cause, NDE, results of core bore samples, and design basis analysis?

Provide a response to part of the original question "What deliverables related to root cause analysis, extent of condition (NDElcore bores), design basis analysis and repair options would be provided to the NRC for review?"

Provide weekly updates to the schedule.

References:

Response Assigned to: Charles Williams Date Due to Inspector: 10/26/2009

Response

i...............

1asked George Thomas for a clarification of this request on 10/28/09. He said he would like a copy of the

'current schedule for activities for the Root Cause, Condition Assessment, Design Basis and Repair teams. A

.hard copy was provided on 10/29/09. Electronic copy of this file is in L:\Shared\2009 NRC SPECIAL INSPECTION TEAM Q-A\WILLIAMS Q-A\Request 32, Q26 Response Info - Williams Misc Notes:

Response By: Charles Williams Reviewed By: Date Response Provided: 10/28/2009i Status: Open Date Closed:

rpt/'l.l Question Page 34 of 85

2009 NRC Special Inspection - RB Concrete Separation 03-Dec-09 9:05:23 AM Request Number: Ga33. y M Individual Contacted: .Garry Miller Date Contacted: 10/22/2009

.Inform ation.R.eq...e.s..t.............

Iniformatiion Request .............

Re questorllnspector:

est : P tove c George o .qu Thnomas

. n -d. ........................

s Rs...... ACaed

. Category: r Request: Providie copy of PGN's andiPii's Root Cause Analysis procedure .......

Include a statement on P11's root cause analysis procedure or if they would be working to PE's procedure.

References:

a e D Duee tto Inspector:

n p c o : f.... 110/26/2009 ...........

/ 6 2 0 .............. ....

ResponseRes pss onse ig n e d o : i~ ha ri s w Assigned to: Charles Williams iiiia s ......................

I ................

i Date

Response

.A hard copy of the PGN root cause procedure CAP-NGGC-0205 was provided to George Thomas on 10/28/09.

PII does not have a written procedure. The PII Root Cause process was discussed with George Thomas as part of response to Request 30. Electronic copy of this file is in L:\Shared\2009 NRC SPECIAL INSPECTION TEAM Q-A\WILLIAMS Q-A\Request 33, Q27 Response Info - Williams M .c .isNo o tte N. e s:....................

Response By: Charles Williams Reviewed By: Date Response Provided: 10/28/2009 Status: Open Date Closed: I rptAII Questions Page 35 of 85

2009 NRC Special Inspection - RB Concrete Separation 03-Dec-09 9:05:23 AM Request Number: 34 Individual Contacted: Garry Miller Date Contacted: 10/22/2009 Requestor/Inspector: George Thomas Category: Question Request: Who is the contractor doing Design Basis Analysis? How does this relate to Root Cause analysis efforts?

References:

Response Assigned to: Don Dyksterhouse Date Due to Inspector: I 10/26/2009

Response

.The selected vendor to perform Design Basis Analysis is MPR Associates, Inc. Alexandria, Virginia. Computer Aided Engineering (CAE) Associates, Middlebury, Connecticut, is supporting MPR in the development of the 3-D

.finite element model.

The Root Cause Analysis team efforts are being supported by Performance Improvement International, P11,

.Oceanside, California and has independent technical capabilities to support the Root Cause Analysis team. The root cause(s) identified by the Root Cause Analysis team will be evaluated by the Design Basis Analysis team for impact on the design analysis and on the design basis.

Misc Notes:

Response By: Don Dyksterhouse Reviewed By: Date Response Provided: I Status: Closed Date Closed: 1 rptAil Questions Page 36 of 85

2009 C Special Inspection - RB Concrete Separation 03-Dec-09 9:05:23 AM Request Number: 35 Ind lividual Contacted: Garry Miller Date Contacted: 10/22/2009 Re questor/Inspector: or George ~g................

.............. Thomas -..... .....................

..... .................................................. C a te g o ry :

ctgr:Qeto Q u e s tio n Request: Are you changing the design or licensing basis? Will a License Amendment or 10CFR50.59 type, analyses be required?

A).Are you changing the ACI 3.18-63 code of record?

References:

Response Assigned to: Don Dyksterhouse Date Due to Inspector: 10/26/2009 1

Response

Misc Notes:

Response By:

Reviewed By: Date Response Provided:

Status: Open Date Closed:

rp[Ail Questions Page 37 of 85

2009 RC Special Inspection - RB Concrete Sepirti no 03-Dec-09 9:05:23 AM RequestRequ Nst m ber Number: 36.............

............3 Individual Contacted: ýGarry Miller Date Contacted: 10/22/2009

= .. . . .. . . .. . . . . . . .. .. . . . . . .. . . .................

Rquestor/Inspector:

Req uest.

George r e be a .p.as.e Thomas

.th-....erabI ..................... c p..........

a .................................................... Caeo ateg o ry:: Question Request: Will there be a past-operability analysis completed?

References:

Re.o s ......... ~IEo t r o s a e D e t n p c o : i..........: 0 2 / C0 Response Assigned to: Don Dyksterhouse Date Due to Inspector: 10/26/2009

Response

Misc Notes:

Response By:

Reviewed By: Date Response Provided:

Open ............................... . ..........

............................................... Date Closed.:..

Status:

riotAl Questioris Page 38 of 85

2009 NRC Special Inspection R RB Concrete Separation 03-Dec-09 9:05:23 AM Request Number: 37 Individual Contacted: i arry Miller Date Contacted: 10/22/2009 R(equestornnspector: :George I nomas Category: Question Request: What type of analysis and codes (by names) is expected to be used in the design basis analysis?l

References:

Response Assigned to: Don Dyksterhouse Date Due to Inspector: 10/26/2009

Response

.The analysis computer code that will be used for the design basis analyses is ANSYS Version 11.0 SPi.

Misc Notes:

Response By: Don Dyksterhouse Reviewed By: Date Response Provided:  !

Sta tu s : o p en..............................................

Date Closed:

rmtAll Questions Page 39 of 85

2009 NRC Special Inspection - Concrete Separation 03-Dec-09 9:05:23 AM Request Number: 38 Individual Contacted: .Garry Miller Date Contacted: 10/22/2009 Requestor/Inspector: Anthony Masters Category: Information Request Request: Provide procedures and drawings for tendon installation and stressing in original construction (containment walls and dome), and also after the 1976 dome repair.

R ef er e n c e s : ........................

Response Assigned to: ýDon Dyksterhouse Date Due to Inspector: 10/26/2009

Response

.Design drawings for both original design and post-dome repair are included in the CR3 Document Control System. Generally the drawing series that start with 421-001 is the original plant design drawings. The series that starts with 421-300 contains the dome repair drawings. Specifications for concrete and reinforcement are included in the shared drive. Drawing copies are included in the drive where available. Several of the 421-300 series of drawings are available only on aperture cards. A drawing list is in the Excel file.

IL:\Shared\CR3 Containment\ROOT CAUSE ANALYSIS Files\(1) Concrete Design\Concrete Design Drawings Misc Notes:

Response By: Glenn Pugh Reviewed By: Charles Williams Date Response Provided: i 110/28/2009, Status: Open Date Closed:

rmtAll CQuestions, Page 40 of 85

2009 NRC Special Inspection B Concrete Separation 03-Dec-09 9:05:23 AM Request Number: 39 Individual Contacted: Garry Miller Date Contacted: 10/22/2009 Requestor/Inspector: Louis Lake Request: Were there any changes to the dome made in 1976 (additional new anchors and/or radial rebars)?

References:

Response Assigned to: Don Dyksterhouse Date Due to Inspector: 10/26/2009

Response

The referenced report and drawings indicate radial #6 reinforcing bars were added and # 11 bars were used to

.replace damaged # 8 circumferential bars. There were approximately 1,850 radial #6 reinforcing bars added. If

any #8 circumferential bars were damaged during concrete removal and the entire hoop was to be replaced, a

1. 11 bar was used in place of the #8 bar. If any #8 circumferential bars were damaged during concrete removal and only a portion of the bar was exposed, a new # 8 bar was cadwelded to the embed bar.

References:

'Final Report - Reactor Building Dome Delamination Report, December 10, 1976 SC-421-341, Reactor Building - Concrete Dome Repair Dome Reinforcement North Half - Top Reinforcement SC-421-342, Reactor Building - Concrete Dome Repair Dome Reinforcement South Half- Top Reinforcement SC-421-343, Reactor Building - Concrete Dome Repair Dome Reinforcement North Half- Bottom Reinforcemen SC-421-344, Reactor Building - Concrete Dome Repair Dome Reinforcement South Half- Bottom Reinforcement SC-421-345, Reactor Building - Concrete Dome Repair Dome Reinforcement Sections & Details Misc Notes:

Response By: Don.... . . Dyksterhouse Reviewed By: Date Response Provided: 11/13/2009 S................. ........... ............................... ......................................s................

Status: Open Date Closed:  !

rptAll Questions Page 41 of 85

2009 RC Special Inspecti n- RB Concrete Separation 03-Dec-09 9:05:23 AM Request Number:

~

Individual ~ ~ 40 r.ier....

........ ... .......................... ............................Da eC

........... n a t d .................. 0) ... ...........

.02 Individual Contacted: ýGarry Miller ~~~ ~ ~ ~ ~ ~ ~Date i~ ...........................

.............. ~ ~ ~~ ~~~~~~~~.... .. 10/22/2009

~ ~Contacted: ...................................

Reques or/In pecto :

Requestor/Inspector: i,* t ho y...M Anthony ~s~e s..............................

Masters ................................. C t g r :Q Category: Question e to Request: What is the cause of the low spot on the dome?

A) Email from Lese said it was same as previous inspections since 1976. Can this be confirmed from the final documentation and photographs in 1976?

References:

Response Assigned to: Don =.. Dyksterhouse

.. .... . . . . . .. . . . . ..................... . . . . . . , Date Due to Inspector: 10/26/2009

Response

'The construction microfiche database contains a listing of microfiche for the dome repair project. The cards range in number from 2C01024 to 2C02089. A search of the database titles showed several microfiche cards (2C02064 and 2C02065) containing nonconformance's and corrective actions for the repair project. A review of these microfiche records did not reveal any information on a low spot. A check of the pour cards also did not mention a low spot or other problem.

However, to help in answering this question a conversation was held with Mr. Earnest Gallion about this repair.

Mr. Gallion was an employee at the time of the dome repair. He reported that the concrete finishers used at the time of the repair where not as experienced as could be. There were several low spots and other imperfections that existed from the initial concrete pours. These are not considered detrimental to the qualification of the dome. Would also consider that these existing since the repair project.

This confirms statements by Mr. Joe Lese.

'Acopy of the Construction Microfiche log is included here: L:\Shared\CR3 Containment\ROOT CAUSE ANALYSIS Files\(2) Concrete Construction\Construction MicroFiche Index.pdf _

Misc Notes: Related to question #1 Response By: Glenn Pugh Reviewed By: Charles Williams Date Response Provided: j 10/28/2009 Status: Open Date Closed:

ri)0\1i QPge42fons Page 42 of 85

2009 1RC Special Inspection - RB Concrete Separation 03-Dec-09 9:05:23 AM Request Number: 41 Individual Contacted: Garry Miller Date Contacted: 10/22/2009 Requestor/inspector: Anthony Masters Ctgr:Qeto Request: NCR 360269 mentions SGR expected flexible tendon sheaths? What was the basis for them expecting a thin wall sheath?

References:

Respsso nig se ned t : '!chari s wiii ...s..........................................

. ....... at e to ns e or i.....................0.2..2.................

Response Assigned to: Charles Williams Date Due to Inspector: 10/26/2009

Response

Enclosed in this folder in response to the above question:

.FW NRC Question - D Jopling Response.pdf Misc Notes:

Response By: Rick Portmann Reviewed By: Date Response Provided: 11/2/20091 S............... ...........

Status: Closed Date Closed:

rptAII Questions Page 43 of 85

2009 NRC Special Inspection - RB Concrete Separation 03-Dec-09 9:05:23 AM Request Number: 42 Individual Contacted: :Garry Miller Date Contacted: 10/22/2009 Requestor/Inspector: Anthony Masters Category: Question Request: Were radial tension stresses due to the hoop tendons considered in the original design?

References:

Response Assigned to: Don Dyksterhouse Date Due to Inspector: 10/26/2009

Response

Cannot readily determine from the old Gilbert Calculations what the direct answer is to the request. It appears that the tendon design is based on limiting the concrete tensile stress to 212 psi. This limit bounds the tensile stresses in meridional, and hoop directions. See Book 2, Section 1.01.7, pages 1.01.7/6 and 1.01.7/7 for a brief memorandum outlining the critical loading of the cylindrical RB wall. The tendon pre-stress is designed to limit

.the tensile stresses in the concrete for the load combinations. However, it does not appear that the calculations

,considered the tensile stresses in the concrete outside the tendon's influence.

,Copies of calculation pages are included at following drive location:

.L:\Shared\2009 NRC SPECIAL INSPECTION TEAM Q-A\WILLIAMS Q-A\Request 42, Q36 Response Info- Pugh' sNote s ns..

.. d.s e rt.o 0 n .g....y.eo.e.ni.o

............ n .... ............... ..

I....

Misc Notes: Consideration is on-going by George/Anthony Response By. Glenn Pugh Reviewed By: Charles Williams Date Response Provided: 10/28/2009 Status: Closed Date Closed:

rptAUl Questions Page 44 of 85

2009 9RC Specia. I hspction - R3 Concrete Separation 03-Dec-09 9:05:23 AM Request Number: 43 Individual Contacted: 'Dennis Herrin Date Contacted: 11/2/2009 Requestor/Inspector: Rqu.s.o/.nsp..tr..Anth o ..............

Anthony Masters Category: Information Request Request: Please provide Drawings: SC-400-007, 008, 009, and 015; and S-425-01 1 and S-425-01 2 Specifications: SP-5566, 5569, 5583, 5618, 5648, and 5909 Reports: VT-3C Report VT-07-106 and VT-3C Report VT-07-1 11 Calculations: S-07-0019 and S-07-0033

References:

Response Assigned to: Don Dyksterhouse Date Due to Inspector: 11/2/2009 i

Response

.Enclosed in this folder in response to the above question: All requested information provided except for SP-

,5566, SP-5583. 11/3/09 Update. The last 2 spec's requested have been included in the file.

Misc Notes:

Response By: Rick Portmann Reviewed By: Date Response Provided: 1 Status: Closed Date Closed:

rpAIIt Que',;ioni; ae 45 Page 5of8 of 85

2009 N RC Specia Inspection - RB Concrete Separation 03-Dec-09 9:05:23 AM Request Number: 44 Individual Contacted: Dennis Herrin Date Contacted: 11/3/2009 Requestorlinspector: Anthony Masters Category: Information Request Request: In continuing evaluation of the IWL inspection and maintenance program:

If possible, I would like to speak with Mr. Bernard Komara and Mr. Marc LeBlanc as they were listed as the inspectors on two previous inspection reports that I have reviewed.

References:

Response Assigned to: Don Dyksterhouse Date Due to Inspector:

Response:.

.Mr. Marc LeBlanc (NIC Contractor Inspector) was here in refuel 15 (2007) and to my knowledge is not here for

.refuel 16. Mr. Bernard Komara (NIC Contractor Inspector)has returned to CR3 for refuel 16 and is working for

,the site QC Organization. The Supervisor for Mr. Komara is Jeff Bennett.. Please contact Jeff (x-3323) for eBernie's availability.

Misc Notes: Evaluation of containment liner bulges still in progress.

Response By: Rick Portmann Reviewed By: Date Response Provided: 1 11/9/2009' Status: Closed Date Closed:

qptWl Qtuestions Page 46 of 85

2009 NRC Special Inspection -  ;')Concrete Separation 03-Dec-09 9:05:23 AM Request Number: 45 Individual Contacted: Dennis Herrin Date Contacted: 11/3/2009 Requestor/Inspector: Anthony Masters Category: Information Request Request: In continuing evaluation of the IWL inspection and maintenance program:

SP-182, Rev. 16 (Dated 5/22/09) Reactor Building Structural Integrity Tendon Surveillance Program, indicates compliance with the 1992 addenda of the 1992 Edition of ASME Section XI, Subsection IWL, while the document titled ASME Section XI/ASME OM Code Program, Interval 4: Containment Inspection Program (2nd CISI) Revision 3 (Dated 5/6/09) indicates the 2001 Edition through the 2003 Addenda. Please clarify.

References:

Response Assigned to: Don Dyksterhouse Date Due to Inspector: 1

Response

ýThe last performance of the Tendon Surveillance under SP-182 was in 2007. The ASME Section Xl code of record during that time was the 1992 addenda of the 1992 Edition of ASME Section Xl, Subsection IWL. In

.accordance with 10CFR50.55a, licensees are required to update their ISI Programs to meet the requirements of

.ASME Section XI once every 10 years or inspection interval. The 3rd inspection interval was completed on August 13, 2008 and the new interval (4th) began on August 14, 2008. For the 4th interval, the 2001 Edition

.through the 2003 Addenda is the code of record. The SP-182 will be revised to reflect the new code edition prior i sc N.s...

es r e:q u ire .5

.. te n d - .n.s la. c e..

u .. i. .. .. ... .. ......... .. .... ... ..... ........ ...... ....... .... ..

Misc Notes:

Response By: Rick Portmann Reviewed By: Date Response Provided: 11/9/2009, Status: Closed Date Closed:I rI0lAU Questiobrs Page 47 of 85

2009 NRC Special Inspection - B Concrete Separation 03-Dec-09 9:05:23 AM Request Number: 46 Individual Contacted: Dennis Herrin Date Contacted: 11/3/2009 Requestor/Inspector: Anthony Masters Category: Information Request Request: in continuing evaluation of the IWL inspection and maintenance program:

SP-182, Rev. 16 (Dated 5/22/09) Reactor Building Structural Integrity Tendon Surveillance Program, has some concrete inspection activites associated with it as part of the tendon survelliances. Are the documented and reported in separate documentation or are the VT-1C and VT-3C examinations credited for this (i.e. VT-07-1 11 and VT-07-289)? If not, I would like to review the additional documentation.

References:

Response Assigned to: 'Don Dyksterhouse Date Due to Inspector: I.

Response

The visual examinations for the tendon surveillances are documented separately from the IWL concrete

• examinations. The last two tendon surveillances and the last two IWL examination reports have been supplied.

'See the Request #24, NRC SIT Question #18 folder for these examination reports.

Misc Notes:

Response By: Rick Portmann Reviewed By: Date Response Provided: 11 /9/2009' Status: Closed Date Closed:

rptAII LestJons Page 48 of 85

009 NRC Si cda ITspecte on RB Cecxicte Se r tt rio 03-Dec-09 9:05:23 AM Request Number: 47 Individual Contacted: Dennis Herrin Date Contacted: 11/3/2009 tor: Anthony Masters Category: Information Request Request. In continuing evaluation of the IWL inspection and maintenance program:

SP-182, Rev. 16 (Dated 5/22/09) Reactor Building Structural Integrity Tendon Surveillance Program,, Section 3.5.3.1 specifies requirements for calibration for all measuring devices. I Rwould

-u. d e.. like to review aa s....t sample of .......

those

.se records also.

}

References:

Response Assigned to: Don Dyksterhouse Date Due to Inspector:

.The tendon surveillance reports have the calibration records for the tendon testing equipment. The last two tendon surveillances reports have been supplied. See the Request #24, NRC SIT Question #18 folder for these iexamination reports.

Misc Notes:

Response By: Rick Portmann Reviewed Bi )ate Response Provided: 11/9/2009, Status: Closed ate Closed:

Page 49 of 85

~-z 'ion ~3C~c t ~

03-Dec-09 9:05:23 AM Request Number: 48 Individual Contacted: Dennis Herrin Date Contacted: 11/3/2009 R.eq storlinspector: Anthony Masters Category: Question qu~est: In continuing evaluation of the IWL inspection and maintenance program:

SP-182, Rev. 16 (Dated 5/22/09) Reactor Building Structural Integrity Tendon Surveillance Program, Section 3.6 specifies acceptance criteria. Section 3.6.2 states that "abnormal conditions determined as the result of a visual inspection of the exterior concrete surface of the containment shall be recorded and documented, and investigated by Engineering for possible degradation of the structure."

Also, "Cracks found in concrete adjacent to the tendons (within 2 feet of the bearing plate) having.

widths greater than 0.010 inch shall be recorded and reported to Engineering for evaluation and resolution. Any crack widths greater than 0.050 inch shall be cause for investigation by Engineering to determine the cause and if there is any abnormal degradation of the structural integrity of the containment."

Photographs VT-07-289-8 and VT-07-289-1 1, which are associated with VT-1 C Report VT 289, appear to show cracks within 2 feet of the bearing plate. Have these been documented and evaluated?

Response Assigned to: Don Dyksterhouse Date Due to Inspector:

The SP-182 criteria specified applies to the anchorage and bearing plate inspections performed for the tendon

.surveillances. The reports discussed are from the ASME Section XI IWL examinations performed. The recording and acceptance criteria may differ as the performance requirements come from separate requirements. These particular indications described on R15 IWL Report VT-07-289 were included in NCR

.256010 for evaluation.

Respon se By: Rick Portmann eewed By: Date Response Provided: 11/9/2009, Closed Page 50 of 85

2009 NC Special Inspection -oRB Concr teS ep rati 03-Dec-09 9:05:23 AM Request Number: 49 Individual Contacted: ýDennis Herrin Date Contacted: 11/3/2009 Requestor/Inspector: Anthony Masters Category: Question Request: In continuing evaluation of the IWL inspection and maintenance program:

SP-1 82, Rev. 16 (Dated 5/22/09) Reactor Building Structural Integrity Tendon Surveillance Program, Section 3.7.1 recommends equipment for implementation of this inspection and 3.7.1.12 lists "optical comparators with 0.005 inch accuracy for measuring crack widths in concrete." Is this being used? VT-07-1 11 and VT-07-289 do not have it listed in the inspection equipment area on the reports. These reports list a 6"scale and measuring tape. Is 0.005 inch accuracy (or the 0.010 inch as acceptance criteria section 3.6.2 states) possible with these?

References:

Response Assigned to: Don Dyksterhouse Date Due to Inspector: 1

Response

The inspection reports referenced were performed as part of the IWL Examinations. The controlling procedures

,are NDEP-0620 and NAP-02. The SP-182 surveillance procedure referenced is used in conjunction with the Tendon examinations (not the IWL Examinations). The accuracy stated comes from the PSC Procedures and equipment utilized for the Tendon Examinations. An example of the certification record for one of the past surveillances can be found on pages 77-78 of the 6th surveillance report {WR 341602 6th-Surv.pdf}. Copies of the certifications have been enclosed in this file. This report can be found:

L:\Shared\2009 NRC SPECIAL INSPECTION TEAM Q-A\WILLIAMS Q-A\Request 24, Q18 Response Info-oPortmann\IWL - Tendon Surveillance History Misc Notes:

Response By: Rick Portmann Reviewed By: Date Response Provided: i 11/12/2009 Status: Open Date Closed rptAdi Questions Page 51 of 85

O9 RC Specia Inspection -RB Concrete Sepaation 03-Dec-09 9:05:23 AM Request Number: 50 Individual Contacted: ýDennis Herrin Date Contacted: 11/3/2009 Req iestor/lnspector: Anthony Masters Category: Question Request: In continuing evaluation of the IWL inspection and maintenance program:

SP-182, Rev. 16 (Dated 5/22/09) Reactor Building Structural Integrity Tendon Surveillance Program, Section 3.7.2.11 states as an prerequisite to "verify that stressing jacks, pressure gauges, comparators, and all other measuring devices have been calibrated per Step 3.5.3.1..."

Are the measuring devices used calibrated per Step. 3.5.3.1?

References:

Response Assigned to: ýDon Dyksterhouse Date Due to Inspector: 1

Response

.Measuring devices are calibrated per Step 3.5.3.1 of SP-182. An example of the certification records for one of

,the past surveillances can be found on pages 58-82 in the 6th surveillance report {WR 341602 6th-Surv.pdf}.

This report can be found:

.L:\Shared\2009 NRC SPECIAL INSPECTION TEAM Q-A\WILLIAMS Q-A\Request 24, Q18 Response Info-rPortmann\IWL - Tendon Surveillance History Misc Notes:

Respon~se By: Rick Portmann Reviewed By: Date Response Provided: i 11/12/2009 Status: Open Date Closed:

ip[AlI Questions Page 52 of 85

2009 NRC SpeciJ i-n p ction - RB Concrete Separati n 03-Dec-09 9:05:23 AM Request Number: 51 Individual Contacted: ;Dennis Herrin Date Contacted:. 11/3/2009 Requestor/Inspector: Anthony Masters Category: Question Request: In continuing evaluation of the IWL inspection and maintenance program:

SP-182, Rev. 16 (Dated 5/22/09) Reactor Building Structural Integrity Tendon Surveillance Program, Enclosure 1 lists tendons in the 5th and 7th surveillance as 46H21, 46H28, etc...;

however, Enclosure 11 indicates that they are numbered as 64H21, 64H28, etc... I believe these are in fact the same tendons, but should the numbers not be consistent?

References:

Response Assigned to: Don Dyksterhouse Date Due to Inspector:

Response

These are the same tendons. The first two digits of the horizontal tendon identification refer to the tendon series on the containment buttresses it spans (ie. Between buttresses 4 and 6 [46Hxx] is the same as between

buttresses 6 and 4[64Hxx]). Over the years CR3 has not been consistent in the use of one versus the other. A

.spreadsheet has been provided showing the tendon identifications used over prior surveillances. [Note: the spreadsheet is not a controlled document, just an aid for review of previous surveillance documentation.]

.Enclosed in the Request# 51 folder:

Spreadsheet: Tendon Identification History (#51).x5s Misc Notes:

Response By: Rick Portmann Reviewed By: Date Response Provided: 11/9/2009 Status: Closed Date Closed:

Page 53 of 85

2009 NRC Speda Inspection - RB Concrete Separation 03-Dec-09 9:05:23 AM Request Number: 52 Individual Contacted: Dennis Herrin Date Contacted: 11/3/2009 Requestor/Inspector: Anthony.Masters Category: Question Request: In continuing evaluation of the IWL inspection and maintenance program:

SP-1 82, Rev. 16 (Dated 5/22/09) Reactor Building Structural Integrity Tendon Surveillance Program, Enclosure 5 is titled "Reduced Force Dome Tendons" and lists 18 tendons. What is meant by this term "reduced force"? When, how, and why did they become reduced? D 125 is shown on this list and is also listed as tested in the 3rd Surveillance. Please clarify.

References:

Response Assigned to: Don Dyksterhouse Date Due to Inspector: I

Response

.Following the investigation and evaluation of the 1976 Dome delamination event the dome tendons were re-stressed to predetermined values, of which approximately every 8th tendon was stressed at a value much, much.

.lower than the remaining tendons (Approx. 646 KIPS vs. 1635 KIPS). These tendons are exempt from tendon lift

.off, and wire removal testing.

During the random selection process if one of these exempt tendons (or in general a tendon that is inaccessible

.or due to interferences cannot be safely tested per the IWL code) happens to be selected for testing, then a

.substitute tendon located as close as possible to the exempt tendon gets selected for examination and testing.

'Although still classified as exempt, the original exempt tendon is still subject to the examination tendon

• anchorage, free water and corrosion protection medium examination requirements if possible.

'A review of the 3rd Surveillance tendon lift-off data shows that tendon D123 was tested. No test data was found

• for D125.

Misc Notes:

Response By: Rick Portmann Reviewed By: Date Response Provided: 11/18/2009, Status:.Open . .Date.Clo.ed:............................ .................................

Status: Open Date Closed:

[AlQi,*e,,forls Page 54 of 85

2009 NRC Special Inspection -RB Concrete Separation 03-Dec-09 9:05:23 AM Request Number: 53 Individual Contacted: :Dennis Herrin Date Contacted: 11/4/2009

........... . J Re questor/Inspector: nno n y lMasters Anlthlony s ~ rs..................

a............... ..................

...... Category: ..Question Request: in continuing evaluation of the IWL inspection and maintenance program:

SP-1 82, Rev. 16 (Dated 5/22/09) Reactor Building Structural Integrity Tendon Surveillance Program, Enclosure 11 lists original lift-off values. Are the values for the dome in this listing before or after the repair?

References:

Response Assigned* to: Don Dyksterhouse . ... . .. . . . . . ....

Date Due to Inspector:  ! ................. .................

Response

The values listed in SP-1 82, Enclosure 11 are following the 1976 delamination event repair of the Dome.

i. ... . . . . . . . .. . . -.... . . . . . . . . . . . . . . . . . . . .I...

Misc Notes:

Response By: Rick Portmann Reviewed By: Date Response Provided: L 1i1/9/2O9, Status: Closed Date Closed: 1 rolAil Questonsa Page 55 of 85

2009 iRC SpeciaI Inspection - RB Concrete Separation 03-Dec-09 9:05:23 AM Request Number: 54 Individual* Contacted: . . . .. . . . . . .. . ..Herrin Dennis . .. .. .. . . . . ... . .. . .. . .. . . ... . ..... . . .. . .. . .. ... Date Contacted:

. .................. ........ . .......... 11/4/2009 .. ............. .......... .. . ..

to r A n h .............. n as e s........................................................... C ateg o ry : ......... Inform a tion Request .......

Requestor/Inspector: Anthony MastersCaeoy InrmtnRqus Requ ng st: ncoi~n va at o of he w~is~eti~ anc.ainena.e.rogam:............ ............. ............................... ......................................

Requiest: In continuing evaluation of the iWL inspection and maintenance program:

I have reviewed some inspection reports for the IWL inspections for the shell, but would like to review some reports and evaluations for inspections

......................... . . . . on .. the . . .. ...dome.

References:

Re sponse Re*spoA n~~~s igned to Ass-igned to:: :Don 6 ....................

Dyksterhouse ...........................................................

........ ..Datet D Duee tto Inspector: n p to ..........................................

Response

.The last two IWL examination reports for 2001 (R12 and 2007 (R15) have been supplied and include zexamination of the dome. See the Request #24, NRC SIT Question #18 folder for these examination reports.

S............................................

N-s................................... ................................. ................. ... ............................... ..... . .................................................. .....

Misc Notes:

Response By: Rick Portmann Reviewed By: Date Response Provided: 11 /9/20091 Status: Closed Date Closed:

rmtAll Questins Page 56 of 85

2009 NRC Jpe Ia Inspection - RB Concrete Separation 03-Dec-09 9:05:23 AM Request Number: 55 Individual Contacted: Dennis Herrin Date Contacted: 11/4/2009 Questio ........

n Requestorlinspector: 'Anthony Masters Category:

Request: In continuing evaluation of the IWL inspection and maintenance program:

VT-07-1 11 and VT-07-289 documents some cracks and spalls and measured depths. How were the depths obtained for the cracks and spalls?

References:

Response Assigned to: Don Dyksterhouse Date Due to Inspector: 1

Response

Direct Visual Examination was conducted on RBCN-00(15 during R1 5 using the suspended work platform, a man

,lift (around the equipment hatch), and a step ladder (lower elevations not accessible by suspended work platform, or man lift).

'Using the procedure and criteria provided in the Engineering letter as threshold for recording, the VT-3C was performed and any areas of distress identified were further evaluated during a VT-1C. The VT-3C also considered areas of distress not previously identified, as well as changes to previously identified areas of distress

.During the VT-1 C, previously existing areas of distress were compared with previous data and further

characterized to document changes to previous data recorded. Areas of distress not previously identified were characterized and recorded. In all cases, size and depth were dimensioned and recorded with a tape measure

and 6" scale. A short length of 3/32" bare wire welding rod was used for tight spots where the 6" scale would not

,fit. Technique used with the bare wire was to insert into the opening, and measure maximum depth against the 6'"

scale.

sM i No tes :............. . ........ .....

c............ ...... .............

Response By: Rick Portmann Reviewed By: Date Response Provided: 11/18/2009 Status: Open Date Closed:

rtAll Questions Page 57 of 85

2009 NRC Special Inspection - RB Concrete Separation 03-Dec-09 9:05:23 AM Re quest Number: 56 Ind lividual Contacted: Dennis Herrin Date Contacted: 11/4/2009 Re questor/inspector: Anthony Masters category: Question Request: In continuing evaluation of the IWL inspection and maintenance program:

VT-07-1 11 and 289, Item #11 indicates that spalls were due to some embedded cables near boxes (shown in photographs VT-07-289-6 and VT-07-289-15). What were these cables?

References:

ReesA posnss ig n e d to : .....................a t

....... ............ Du to I s e o r ......................................

Response Assigned to: 'Don Dyksterhouse Date Due to Inspector:

Response

,It is believed that these cables and boxes are abandoned remnants from the testing equipment utilized during the original Structural Integrity Test in 1976. (stress & strain gages etc.)

Misc Notes:

Response By: Rick Portmann Reviewed By: Date Response Provided: 11/9/2009!

Status: Closed Date Closed:

rptAfl Questions Paqe 58 of 85

2009 NRC Special Inspection - RB Concrete Separation 03-Dec-09 9:05:23 AM Request Number: 57 Individual Contacted: Dennis Herrin Date Contacted: 11/4/2009 Reqi.estor/Inspec o* a Anthiony Masters .........................................

..................... ........................................................................................ Category : ..................... Question .............

Request: in continuing evaluation of the IWL inspection and maintenance program:

The names and dates on theVT-1C and VT-3C reports are identical. Are both i .s.! e.....

inspections/reports t. ..... .!/.....

e .........

. rt. done . 0onn the . ................

samea.r.e .dday a ... by.y...t...

the same a~ e sstaff? af .....................................................................

References:

Response Assigned to: DnDyksterhouse Date Due to Inspector:

Response

Yes, the VT examiners know that certain indications found during a VT-3 examination require an additional, closer VT-1 examination and may elect to perform both examinations in series since they are already at the area.,

Misc Notes:

Response By:

Reviewed By: Date Response Provided:

Status: Open Date Closed: I rptAII Questions Page 59 of 85

2009 NRC Special Inspection - RB Concrete Separation 03-Dec-09 9:05:23 AM Request Number: 58 Individual Contacted: Dennis Herrin Date Contacted: 11/4/2009 Requestor/Inspector: Anthony Masters Category: Question Request: In continuing evaluation of the IWL inspection and maintenance program:

FSAR, Section 5.2, Section 5.2.5.2.1.1.h.5 states: 5. The surveillance was performed 1, 3, and 5 years after the initial containment structural integrity test and is performed every 5 years thereafter. A report of each inspection will be recorded and significant deterioration or abnormal behavior reported to the Commission.

Are significant deterioration or abnormal behaviors being reported to the Commission?

References:

Response Assigned to: Don Dyksterhouse Date Due to Inspector:

Response

Yes - Significant deterioration or abnormal behaviors are being reported to the Commission. SP-182 (Para's

.5.3.2 and 5.3.4) and the Improved Technical Specifications (5.7.2 Special Reports) describe the reporting

.requirements.

i. .. ... ... .......... . .. . .. .. . .. . .... . .. ............... . . ....................................................... .. ..... .. .. ... .. .. ... .... ... .. .. ... .. .. ..... .. ... . . .

Misc Notes:

Response By: Rick Portmann Reviewed By: Date Response Provided: 11/12/2009 Status: Open Date Closed:

rptAII Quesionrs Page 60 of 85

2009 RC Special Inspection - RB Concrete Separation 03-Dec-09 9:05:23 AM Request Number: 59 Ind ivid~ ~tct ual~ ~ ~ d~~~ ~~~~~~~~~~~.. ....niS ....... D t C o

....n.............................................

...................................... ac e : ......... i /4 2 09 .......... i Individual Contacted: Dennis Herrin Date Contacted: 11/4/2009 Requestor/Inspector: iAnthony MastersCaeoy

...................... C a te g o ry : InrmtnRqus In fo rm a tio n Re q u e s t Request: In continuing evaluation of the IWL inspection and maintenance program:

I would like to review SP-180 and understand the basis surrounding the use and discontinuance for Rn inspections ce. of the! domed .repairs. R-c.......................................................................................................................................

a ...............................................................................................................................

References:

Response Assigned to: *Don Dyksterhouse Date Due to Inspector.

Response

!A copy of SP-1 80 for inspection of the dome was provided to George Thomas on November 18, 2009. The

,document was obtained from microfiche and is not available electronically. Also note that the procedure was Ideveloped and implemented prior to the development of the IWL program.

Misc Notes:

Response By:

Reviewed By: Date Response Provided: I Status: Open Date Closed:

rp'AlI QuestionsP Page 61 of 85

2009 NRC Special Inspection - RB Concrete Separation 03-Dec-09 9:05:23 AM Request Number: 60 Individual Contacted: Dennis Herrin Date Contacted: 11/4/2009 Requestor/Inspector: Louis Lake Category: Question Request: What are the repair options being considered as a fix to the CR3 containment delamination issue.,

References:

Response Assigned to: Sammy Radford Date Due to Inspector: 11/6/2009

Response

There were two options that had being considered.

1. Remove the delaminated concrete that is between is between Buttress #3 and Buttress #4 and install addition

.rebar ties. The wall will be reformed and replaced with new concrete. This was the method used to repair the delaminated dome section during construction and the method we will be using.

.2. The next option we considered was to install anchors into the solid concrete portion of the wall on a spacing tc

.be determined and anchor the delaminated section and solid section together. Then we will be pressuring grouting the delamination using a cementitious grout and epoxy grout to bond the two layer.We will be using

.some NDT to ensure we have filled all the voids between the two layers. This option was eliminated due to

problems identified with the use of the grout with the potential of the debris blocking flow paths of the grout and size of some of the crack areas.

Misc Notes:

s o e  : S f.......................................................-

d...............

Response By: Sammy-Radford-. . . ..........

Reviewed By: Date Response Provided: 11/1 8/2009 Status: Open Date Closed: I rptAII Questians Page 62 of 85

2009 NRC Special 1n, ection - RB Concrete Separation 03-Dec-09 9:05:24 AM Request Number: 61 Individual Contacted: Dennis Herrin Date Contacted: 11/4/2009 Rze questorlInspector: Louis LaKe Category: Question Request: What post modification testing of the CR3 containment is being planned to be performed following repair of the delaminated condition in order to demonstrate structural and leak-tight integrity?

References:

Response Assigned to: Sammy Radford Date Due to Inspector: 11/6/2009

Response

We are looking at the requirements for post mod testing. At the present time we plan to use the ILRT as the post

.mod testing.

Misc Notes:

Response By: Sammy Radford Reviewed By: Date Response Provided: 1 11/18/2009, Status: Open Date Closed:

Page 63 of 85

2009 NRC Special Inspection - RB Concrete Separation 03-Dec-09 9:05:24 AM Request Number: 62 Individual Contacted: Charles Williams Date Contacted: 11/18/2009 1 Requestor/Inspector: ,George Thomas Category: Information Request Request: Provide strain gage data and map.

References:

Response Assigned to: Paul Fagan Date Due to Inspector: 11/18/2009

Response

Strain gage and displacement data provided on 11/18/09. Electronic copies available on L:\Shared\2009 NRC

SPECIAL INSPECTION TEAM Q-A\FAGAN Q-A\Request 62 - Worthington - Williams Misc Notes

Response By: Worthington Reviewed By: Charles Williams Date Response Provided: I 11/18/2009.

Status: Closed Date Closed: I

)WAtQuestion,< Page 64 of 85

2009 NRC Special Inspection - RB Concrete Separation 03-Dec-09 9:05:24 AM Request Number: 63 Individual Contacted: Garry Miller Date Contacted: 12/2/2009 i .......... ........................... .... . ... .................

.................... C a t e g o r y :. . .. . . . .. .. ..... . ......

Requestor/inspector:cteo:

Request: Provide survey data results for the dome [repeated survey surveilance test ], internal diameter of containment and survey data results for external buttresses.

References:

Response Assigned to: PaulFagan Date Due to Inspector:

Response

Misc Notes:

Response By:

Reviewed By: Date Response Provided:

Status: Date Closed:

rp(AIt Questions Page 65 of 85

2009 NRC Special Inspection .-, Concrete Separation 03-Dec-09 9:05:24 AM Request Number: 64 Individual idu~~

InadlivContacted:

tc t d Garry.... .. .iie........ ........................... ............

Miller ........ D Datet Contacted:

o.n a t d ............

........-.2.../2 12/2/2009 0... ................

I...

Rtu er n s e t r ...................................

RequestorlPnspector: Category:

Request: Provide evaluation of crack identified in AR 368389368389[core number 54 below the equipment hatch].'

References:

Response Assigned to: Paul Fagan Date Due to Inspector:

Response

Misc Notes:

Response By:

Reviewed By: Date Response Provided:

Status: Date Closed:

rpiAil Questions Page 66 of 85

2009 NRC Speci nspection - RB Concrete Separation 03-Dec-09 9:05:24 AM Request Number: 65 Individual Contacted: Garry Miller Date Contacted: 12/2/2009 Resu o!n p c o :

Requestor/Inspector:Caeoy ...............

............................................................ Category:

Request: Provide credentials of MPR Associates and CAE specifically with regard to concrete containment structural analysis and design for nuclear plants.

References:

Response Assigned to: Don Dyksterhouse Date Due to Inspector:

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rl)t/t*Jl Q*<'s[ior*s Page 67 of 85

2009 NRC Special Inspection - RB Concrete Separation 03-Dec-09 9:05:24 AM Request Number: 66 Individual Contacted: Garry Miller Date Contacted: 12/2/2009 Requestorlinspector: Category:

Request: Please confirm that the condition assessment, design basis analysis, root cause analysis, and repair option analysis efforts, currently ongoing for CR3, account for the following: SGR construction sequence (initial tendon detensioning, concrete removal, additional tendon detensioning, concrete placement, repair, tendon retensioning) loading and stiffness, based on the extent of condition of the affected areas, and is properly considered to account for the stress redistribution in the containment wall within the opening and its adjacent areas.

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Page 68 of 85

2009 Special Inspection - RB Concrete Separation

$RC 03-Dec-09 9:05:24 AM Request Number: 67 Individual Contacted: Garry Miller Date Contacted: 12/2/2009 Requestorlinspector: Category:

Request: Refer to Slide #59 of the 11/20 public meeting presentation. This is with regard to how the liner is modeled for the Design Basis Analysis. Based on your current design basis in the FSAR and Containment Design Basis document 1/1, the liner serves as a leak-tight membrane during operating and accident conditions, and not as a structural element resisting design basis loads.

However, in your current FEA model developed for the delamination issue, the liner seems to be included as a structural load-carrying member.

Explain and justify how the way the liner is modeled in the ANSYS model are consistent with your.

current design basis?

How will the liner be evaluated against design basis acceptance criteria?

How will you evaluate the effects on the liner during detensioning, repair, and retensioning?

References:

Response RespoA nse ssig ned to Assigned to:: iD~

Don D yi...e...u.e........................D Dyksterhouse .. ate.D Date Due ue.. spe.or.................................. .......................

to Inspector:

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Reviewed By: Date Response Provided: I Status: Date Closed: I rptAll Questions Page 69 of 85

6 - 4 2009 NRC Special Inspection - RB Concrete Separation 03-Dec-09 9:05:24 AM Request Number: 68 Individual Contacted: Garry Miller Date Contacted: 12/2/2009 I Requestorlinspector: Category:

Request: Refer to Slide #75 of the 11/20 public meeting presentation. Slide states: "Run comparison to original design building elastic design results."

Explain how you plan to evaluate your analysis results for design basis loads and load combinations against acceptance criteria in accordance with the code of record, i.e., ACl 318-63, in the FSAR. How would you process your analysis results to perform code checks for stresses, strains, displacements or other applicable design basis acceptance criteria for concrete, rebar, liner and prestressing tendons? How is reinforcement being accounted for in your design basis evaluation?

The slide only inidicates evaluation for controlling factored load combinations. Are there not service or other load combinations in the design basis with a different set of acceptance criteria that needs to be documented? How would your calculation document the design basis of the modified containment following repair of the delaminated condition?

How will stresses in the concrete and rebar be determined from the ANSYS analysis? Provide your approach to performing the finite element analysis and design checks in support of the Design Basis Analysis considering the various interim configurations associated with the creation and restoration SGR construction opening, the delamrinated condition and the associated repair?

References:

Date Due to Inspector:...........

Response Assigned to: Don Dyksterhouse

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r )tAfl Quiestion:, Page 70 of 85

2009 NRC Special Inspection - RB Concrete Separation 03-Dec-09 9:05:24 AM Request Number: 69 Individual Contacted: Garry Miller Date Contacted: 12/2/2009 Requestor/Inspector: Category:

Request: Refer to Slide #74 - "Planned Analysis Steps" of the 11/20 public meeting presentation. Footnotei (1) against "Delamination states "Analysis will consider time of delamination and specific concrete properties."

Since the final-root cause analysis results will not be known until later, do you plan on running two different cases with regard.to timing of delamination at this time? Specifically, with regard to making a decision on the number of tendons that will be required to be detensioned prior to repair and retensioned following repair.

Regarding the bullet that states: "SAVE path dependent model for starting point to Run 5 controlling design cases." As you go through the planned analysis steps, explain how your analysis model or ANSYS software is capable of starting the next analysis step using the deformed configuration of the previous step as the initial conditions for the next analysis step?

Are you planning to use the same concrete mix design as for the SGR construction opening in implementing repair of the delaminated area? How are properties of the new concrete being incorporated into your analysis?

Referen ces:

Response Assigned to: Don Dyksterhouse Date Due to Inspector:

Response

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Reviewed By: Date Response Provided: i Status: Date Closed: I rmAlI Questions Page 71 of 85

2009 NRC Special Inspection - RB Concrete Separation 03-Dec-09 9:05:24 AM Request Number: 70 Individual Contacted: Garry Miller Date Contacted: 12/2/2009 Requestorlinsp *ctor: Category:

Request: With reference to 11/20 public meeting presentation, Slide 65- shows approximation in Equipment Hatch modeling; and Slide 34 - shows that the delaminated conditions extends to above the EQ hatch area; slide 35 shows hoop tendons that wrap around EQ hatch. Further, there are also removed vertical tendons that wrap around EQ hatch. If your detensioning/retensioning scheme involves tendon elements that influence forces in the EQ hatch area, how do you plan to address it in your design basis model? Describe any plans to refine your model around the EQ hatch area. . . . .. . . . .

References:

Response Assigned :o: Don Dyksterhouse Date Due to Inspector:

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rpLA1I Questions Page 72 of 85

2009 NRC Special Inspection - RB Concrete Separation 03-Dec-09 9:05:24 AM Request Number: 71 Individual Contacted: qGarry Miller Date Contacted: 12/2/2009 Rse o u l n p c o : ......... ................................

.. ......... C a e ...............

o y Requestor/inspector:Caeo:

Request: Refer to slide 58 of the 11/20 public meeting presentation - describes a 180 degree symmetric model.

Please confirm whether, for your analysis, the explicitly developed 180 degree model is extruded to 360 degrees for your runs or not.

Please confirm if there are any unsymmetric containment features that may not be adequately represented in a symmetric model but may affect the response of the affected area.

References:

Response Assigned to: ;Don Dyksterhouse Date Due to Inspector:

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Status: Date Closed: I ip[Ail a ;:eista3ns Page 73 of 85

2009 NRC Special Inspection - RB Concrete Separation 03-Dec-09 9:05:24 AM Request Number: 72 Individual Contacted: Garry Miller Date Contacted: 12/2/2009 Requestordinspector: Category:

Request: Refer to Slide 74 (and 76) of the 11/20 public meeting presentation. The first three planned analysis steps are: (i) Dead Load + Tendons; (ii) Remove Hoop + Vertical Tendons in SGR opening; and (iii) Remove SGR opening. Provide stress and deformation plots for the area in and around the vicinity of the SGR opening (between Buttresses 3 & 4 from above the EQ hatch to below the ring girder) for each of the above configurations fo rthe Dead + Prestress load combination.

References:

Response Assigned to: Don Dyksterhouse Date Due to Inspector:

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)AARQ e~stiors Page 74 of 85

A I . )

Cp: I 1nspecti n - RB Concrete Separatior 03-Dec-09 9:05:24 AM Request Number: 73 Individual Contacted: Garry Miller Date Contacted: 12/2/2009 ReqUestoriJnspector: Category:

Request: Refer to Slide 81 of the 11/20 public meeting presentation with regard to Post Repair Testing.

Provide the name and credentials /qualifications of the designated Responsible Engineer, in accordance with ASME Section XI, Subsection IWL, for repair/replacement of the CR3 containment structure related to the SGR project and the Containment Delamination project.

Provide the date the individual was designated as the Responsible Engineer.

Second bullet on the slide states: "Concrete exterior will be visually examined prior to pressurization and following depressurization." Third bullet states: "Evaluating other additional instrumentation based on the final repair that is implemented, and as driven by: root cause analysis." For the major containment repair/replacement activity involved at CR3, describe how the post-repair system pressure testing would meet the requirements of IWL-5000, and

References:

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specifically provide verification of the containment structural integrity under accident pressure and corresponding

~ ~~ structural behavior as predicted~~~ ............ i......

by the design basis analysis. . .. .. ..: .....

RsesepoAn s s i n e d to : i~ ....... les*....................

h a............. Wllia.............................................................................................

Response Assigned to: Charles i. .. ... .. ... .. Williams

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rtlmAll Questions, Page 75 of 85

. A 209 N C Specal Ispection RB Concrete Separation 03-Dec-09 9:05:24 AM Request Number: 74 Individual Contacted: ýGarry Miller Date Contacted: 12/2/2009 Requestor/inspector: Category:

Request: Refer to photos on Slide 14 of the 11/20 public meeting presentation.

Explain the gap between the liner and the concrete? Have you verified how far it goes?

It is our understanding that there is bulging in the containment liner with air voiding between liner and concrete at several locations all around between approximate EL 180 and 225 ft; and that it was dispositioned as construction/fabrication errors that existed prior to concrete pour. If this existed prior to original concrete pour, explain how there is voiding between the liner and concrete. What was the acceptance criteria used to evaluate this? Provide the engineering evaluation for-accepting the bulging as-is and explain how this evaluation is consistent with CR3 current design basis.

References:

~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~~~~f' Response Assigned to: :Paul Fagan Date Due to Inspector: .

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Page 76 of 85

)

2009 NRC Special Inspection - RB Concrete Separation 03-Dec-09 9:05:24 AM Request Number: 75 Individual Contacted: Garry Miller Date Contacted: 12/2/2009 c o :

Reu/son p ector:Caeoy i..... . . .. ................... ....... ......................

Req iestorlinsp Request: Describe your plans [Pill for finite element simulation of the delamination to confirm the root cause(s)?

References:

Response Assigned to: Charles.........Willaims .. .... .... . ..... . .... . . .. .. .. . . .. .. .. .. ................. ................

.. Date Due to Inspector: . ..................... ....... . ...............................

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rptAil Questions Page 77 of 85

I - % -

2009 NRC Special Inspection - RB Concrete Separation 03-Dec-09 9:05:24 AM Request Number: 76 Request: Referto the Refutingevid.ence for.failure mode.2.8 "Inadequatesupport of.iTend.ns during.

Pouring." There are photographs of the SGR opening area that show that the as-found hoop tendon sheathing are all not centered on a vertical line.

What was the design location of the tendon sheathing?

Was the installation of the tendon sheathing out-of-tolerance in the as-found condition (Tendon installation specification must have had a tolerance for tendon sheathing installation)?

Re..r.nc e s:. ..

.... s. .. . e....c....

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Response Assigned to: Charles Williams Date Due to Inspector:

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Status: Date Closed: I rptAfl Questoons Page 78 of 85

2009 RC Special Inspection - RB Concrete Separation 03-Dec-09 9:05:24 AM Request Number: 77 a ldivid~

In u tct~d ~G a.iie

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... Da e C n a t d ...............................

2 00. 9 ....

.i Individual Contacted: Garry Miller Date Contacted: 12/2/2009 1 Roeus/ n p c o : . . ............

........ -- - -............... Ca e....................

o y -...................

Requestor/Inspector:.Categ.r.:

Request: Confirm whether "the lack of bond between the smooth tendon sheathing and the concrete" is included as a possible failure mode in the root cause investigation.

References:

Response Assigned to: Charles Williams Date Due to Inspector:

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rptAll Ques3tior' Page 79 of 85

2009 N C Special Inspection - RB Concrete Separation 03-Dec-09 9:05:24 AM Request Number: 78 Individual Contacted: CGarry Miller Date Contacted: 12/2/2009 Requestor/inspector: Category:

Request: Considering the delamination and subsequent repair of the CR3 dome during original construction, what non-destructive examination, core boring and/or other appropriate testing wasi extended to the dome during the current investigation of the containment wall delamination issue to confirm that the 1976 dome repairs remaind good? Provide results of the examinations performed on the dome. Also, explain how the results for these examinations would help address/resolve the concerns raised in the previous Requests #1 and #40 with regard to the low spot or depressed area on the dome.

References:

Response Assigned to: Paul Fagan Date Due to Inspector:

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rptAA1 Qtuesýt Page 80 of 85

2009 NRC Special Inspection - RB Concrete Separation

-- _= 1 2 Olm = I 03-Dec-09 9:05:24 AM Request Number: 79 Individual Indivl~ ua~ tct

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idContacted: Garry .. Miller....--............

. .. ............ Date D t Contacted:

o t c e : ........... 12/2/2009

~2 2 0 ............

Requestorllnspector:Cte ............... ...............

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C a t e g ory Request: Explain how your condition assessment performed in accordance with Procedure PT-407T (NDE testing, core bore sampling, boroscopic examinationetc.) provides a reasonable assurance of a comprehensive and accurate determination of the extent of delaminated condition of the containment.

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Response Assigned to: Paul Fagan Date Due to Inspector:

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OtAII Quest'ons Page 81 of 85

2009 NRC Special Inspection - RB Concrete Separation 03-Dec-09 9:05:24 AM Request Number: 80 Individual Contacted: Garry Miller Date Contacted: 12/2/2009 Requestorllnspector: Category:

Request: Provide information of the total number of core samples that were sent for petrographic examination for the containment delamination issue. Indicate the labs to which each sample was sent. How did you determine/ensure consistency of the examination and results between the labs? How did you establish that a reasonable number os samples were sent for petrographic examination?

References:

Response Assigned to: Charles Williams Date Due to Inspector: I

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rptAll QuestosPa 8o8of 85 Page 82

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2009 NRC Special Inspection - RB Concrete Separation 03-Dec-09 9:05:24 AM Request Number: 81 Individual Contacted: Garry Miller Date Contacted: 12/2/2009 Requestorlinspector: Category:

Request: According to MacTec petrographic report dated November 11, 2009, limited observations were to be performed on sample 21270A (Core #2) which was used as a control sample. However, there, is no discussion of how it was used. Also, it does not appear that any results from these observations were reported. What examinations were performed on this sample, what were the

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results and where is it documented?

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Response Assigned to: Charles Williams Date Due to Inspector: I

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4, 'A 2009 NRC Special Inspection - RB Concrete Separation 03-Dec-09 9:05:24 AM Request Number: 82 Individual Contacted: :Garry Miller Date Contacted: 12/2/2009 Requestor/Inspector: Category:

Request.: According to MacTec petrographic report dated November 11, 2009 from MacTec, one-half of sample 21270 (Core #2) was sent to CTL for petrographic examination. In the CTL report dated November 2, 2009 there does not appear to be any reference to this sample. Were petrographic.

examinations performed on this sample, and if so, what are the results and where is it documented?

References:

Response Assigned to: Charles Williams Date Due to Inspector: .........................

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rptAll Questions Page 84 of 85

2009 NRC Special Inspection - RB Concrete Separation

- E - mmmý E - , XIZZMýl 1ý 03-Dec-09 9:05:24 AM Request Number: 83 Individual Contacted: 'Garry Miller Date Contacted: 12/2/2009 Requestor/Inspector: Category:

Request: Describe what confirmatory NDE would be performed, after detensioning of additional tendons, in the areas that did not show any delamination in order to verify that the delamination has not p~ro~pagated any further due to additional detensioning.

References:

Response Assigned to: Paul Fagan Date Due to Inspector: .

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rp~tAlI Qu~estions* Page 85 of 85