proposed use of a fiber-reinforced polymer system at the … · 2012-11-29 · ~duke wpower®...

~Duke

WPower®

Proposed Use of a Fiber-Reinforced Polymer System at theOconee Nuclear Station

Presentation to:The United States Nuclear Regulatory Commission (NRC)

Rockville, MDMay 14, 2007

DukeDuke Participants PC: Power®

" Larry Nicholson, Manager, Safety Assurance

" Rich Freudenberger, Tornado-HELB Design Basis Group

* Stephen Newman, Regulatory Compliance

" Jim Sumpter, Regulatory Compliance

e Clifford Davis, Major Projects Group

* Lawrence Llibre, Major Projects Group

" Tommy Mills, Major Projects Group

5/16/2007 2

PDukeOPowereAgenda

" Introductions

" Purpose of Meeting

w Identify information needed to license the use of FRP to strengthenmasonry walls at ONS

" Brief Description of the Natural Phenomenon Barrier System

* Timeline

* Example Exercise using Design Method

* Discussion of Additional NRC Comments to Duke's RAI Response

* Closing Remarks

5/16/2007 3

Brief Description of the Natural PhenomenonBarrier System

, Duke'Power®

Unit 3 Control Room North Wall --",

* SSF Elevated Trench(5 locations)

5/16/2007 4


DukePower®

Construction Pictures

5/16/2007 5

Brief Description of the Natural Phenomenon DukeBarrier System Powero

o Application: Bond-critical application for flexuralstrengthening of non-load bearing, infill masonry wallsto resist higher design loads.

Note: Application is similar to traditional technique ofemploying externally- bonded steel plates.

* Loading Condition: Uniform pressure on masonrywall resulting from tornado-induced differentialpressure and possibly tornado wind causing tensilestresses in FRP system.

Note: FRP system will not be relied upon as acompressive reinforcement.

5/16/2007 6

Brief Description of the Natural Phenomenon ' DukeBarrier System ,Power®

* Example Location: Exterior surfaces of selected Units1, 2, and 3 West Penetration and Cask DecontaminationTank Room walls.

Note: FRP system will be shielded from sunlight (i.e.,UV) by siding.

* Environment: Ambient temperature and humidityconditions associated with local climate and AuxiliaryBuilding equipment rooms.

Note: FRP system will not be located in a high radiationenvironment or exposed to high temperature gas and/orliquid.

5/16/2007 7


a DukeWPower®

Typical FRP Application

.Existing UnreinforcedMasonry Wall

Vertical FRP Reinforcing

Horizontal FRP Reinforcing

5/16/2007 8

Timeline DukeTimelne ro-- ̀ Po we r

FIBER REIN FOR CED POLY MER LARMMUMSONOW

PROJECT PHASE,

Duke/NRR Pre-LAR Meeting (Rockville, MD)

NRR Meeting Summary Letter

AtNRR RAts received (1st set - via emcil)

Duk RAIrepose. sntvi.e ai Iiiii

DATE

. .....3/23/06 "

4/05/06

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3/14/07

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Duke/NRR conference Call

NRR RAls received (2nd set - via email)3

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6 = 8 9 10 11 12

13 14 15 16 17 18 19

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Duke/NR Puli Meein (Rcvle MD

J i ....LNRR Issues meeting agreement letter

Duk RAIrepose.frma.ysumite

131

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4 5 6 7 8 9 10

11 12 13 M 15 16 17

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25 26 27 28 29 30 314/18/07

5/16/2007 9

, Duke'Power®Example Exercise Using Design Method

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5/16/2007 10

Discussion of Additional NRC Commentsto Duke's RAI Responses

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Ref.: Issues Table

5/16/2007 I1I

P Duke4kPower®Closing Remarks

" Questions

* Action Items

5/16/2007 12

Oconee Nuclear Station FRP RAI Issues

Item#l k -2NRCIssue- Dtk oillt Resolution of, Item~; ;

FRP 1 Enclosure 3 to the letter listed 53 walls that 0 This appears to be an introductory, summary * Simple beam and plate theory will becurrently planned to be strengthened using FRP. statement of the content of Enclosure 3 to used to calculate masonry wallThe walls include single-wythe 8" hollow-core Duke's response to the RAI. stresses.concrete block and double-wythe 4" solidconcrete brick. The aspect ratios (height/width) Duke presented the proposed analytical FRP will be substituted for steelof walls vary from 0.6 to 2.9. The edge methods and detailed equations in Enclosures reinforcing when necessary.conditions of walls are mortat-joint edges at top, 4 and 5 to its response to the RAT. Sample The various configurations from thebottom, and both sides, and mortat-joint edges at calculations using these equations are ls f5 al ilb onetop, bottom, and one side. presented in Enclosures 6 and 7 to its list of 53 walls will be bounded

response to the RAI. Test data to substantiate (meets code allowables) by one of the

We made very clear to the licensee in our the analytical methods is presented in two design methodologies proposedprevious meetings that the licensee needs to Enclosures 8 and 9. The test data is evaluated in the RAI response. Thesepresent their specific methods (equations) for using the analytical methods and detailed methodologies are supported by test

using FRP to strengthening the particular type of equations of Enclosures 4 and 5 to data.masonary walls and submit test data that can demonstrate their validity and conservative If a wall does not meet one of thesesubstantiate the methods (equations) that they results. two methodologies, the wall(s) willpropose to use. However, the licensee failed be physically modified to meet theagain to response to this request. criteria.

0 Test coupons and pull tests will verifyFRP strength and adhesion.

FRP 2 Instead, the licensee responded that it would use This statement appears to indicate a 0 The more conservative reductionACI 440.2R-02 or FRP system manufacturer's misunderstanding of the information factors from either the FRP systemmethod, as documented on page 9 of Enclosure presented in Enclosure 5 to Duke's response manufacturer or ACI 440.2 will be5. to the RAI. On page 9 of Enclosure 5, Duke used.

stated that it would use the working stressdesign method (our current LB) forreinforced masonry to design the FRPflexural reinforcement. To supplement theseequations, Duke also stated that it would usethe environmental and strength reductionfactors and most restrictive strain limitations(i.e., allowable stress) for the FRP from ACI

Duke will provide hardcopies of the RAI response (with all enclosures) to all present at the May 14th meeting.

Page 1 of 3

DRAFT DOCUMENT - FOR DISCUSSION PURPOSES ONLY


It~i '. N7RC Issue Duk Co metS Re'j tii -ft

440.2 or the FRP system manufacturer.

Based on the types of masonry constructiontabulated in Enclosure 3 to Duke's responseto the RAI, only two fundamental wall typesexist: simply-supported one-way span andsimply-supported plate (4 sides). Additionaltest data would be representative of these twotypes of masonry construction.

FRP 3 The licensee agreed with the staff in our Duke presented test data to substantiate theprevious meetings that ACT 440.2R-02 had not proposed analytical methods in Enclosures 8 and 9been reviewed and adopted by the ACI code, to its response to the RAI. The parameters, extent,and the staff did not accept it as an accepted and format of any additional test data requiremethod. However, the staff stated that it would clarification.accept the licensee's methods if they can besubstantiated by, or were derived from, test data.During our last meeting, the licensee referred themethod and substantiation as a box and statedthat only walls falling within the box could usethe method.

FRP 4 During our last meeting, the licensee did not See Response to FRP #2.know how many types of walls they had andtherefore did not know how many boxes theywould have. Now, they know the types of wallsthey plan to strengthen using FRP, but providedno single box. For an example, based onavailable test data, a box can be established forwalls of single-wythe 8" hollow-core concreteblock with mortat-joint edges at top, bottom, andboth sides for aspect ratios between x and y andanother box can be established for walls ofdouble-wythe 4" solid concrete brick withmortat-joint edges at top, bottom, and one sidefor aspect ratios between x and y. The licenseeneeds to establish as many boxes as required to

Page 2 of 3



jeJNRoIsuebme; iets Resolution fi em

cover the 53 walls.

FRP 5 1 have also reviewed the FRP system Duke does not understand the intent of thismanufacturer's (FYFE CO.) design manual, and statement.it has no reference to Oconee's walls.

FRP 6 It is the licensee's responsibility to provide the See response to FRP 2.methods (equations) for using FRP and presenttest data to substantiate the adequacy of themethods for Oconee walls.

FRP 7 The NRC stated that there is an engineering If this statement refers to the applicability of

(Conf. mechanics problem with the way Duke is plate theory in the computation of masonryattempting to equate the test data with the given wall internal forces/moments for the simply-

call note) methodology. supported plate (4 sides) assumption, Duke

cites the position of ACI 530, MasonryStandards Joint Committee, on the matter asreflected in the Commentary on ACI 530-05,Section 1.1.3:

"For allowable stress design, linear elasticmaterials following Hooke's Law areassumed, that is, deformations (strains) arelinearly proportional to the loads (stresses).All materials are assumed to behomogeneous and isotropic, and sections thatare plane before bending remain plane afterbending. These assumptions are adequatewithin the low range of working stressesunder consideration."

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proposed use of a fiber-reinforced polymer system at the … · 2012-11-29 · ~duke wpower®...

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