Text

Request for Approval for Use of Alternate Calibration Block Reflector Requirements 16-PDI-5
	ML16151A010
Person / Time
Site:	Browns Ferry, Watts Bar, Sequoyah ; (DPR-033, DPR-052, DPR-068, DPR-077, DPR-079, NFP-090, NFP-096)
Issue date:	05/27/2016
From:	James Shea; Tennessee Valley Authority
To:	; Document Control Desk, Office of Nuclear Reactor Regulation
References
	CNL-16-022
	Download: ML16151A010 (22)
	v • d • e

Tennessee Valley Authority,1101 Market Street, Chattanooga, Tennessee 37402 CNL-16-022 May 27, 2016 10 CFR 50.55a ATTN: Document Control Desk U.S. Nuclear Regulatory Commission Washington, D.C. 20555-0001 Watts Bar Nuclear Plant, Unit 1 and 2 Facility Operating License Nos. NFP-90 and NFP-96 NRC Docket Nos. 50-390 and 50-391 Browns Ferry Nuclear Plant, Units 1, 2, and 3 Renewed Facility Operating License Nos. DPR-33, DPR-52, and DPR-68 NRC Docket Nos. 50-259, 50-260, and 50-296 Sequoyah Nuclear Plant, Units 1 and 2 Renewed Facility Operating License Nos. DPR-77 and DPR-79 NRC Docket Nos. 50-327 and 50-328

Subject:

Browns Ferry Nuclear Plant Units 1, 2, and 3, Sequoyah Nuclear Plant Units 1 and 2, and Watts Bar Nuclear Plant Units 1 and 2 - Request for Approval for Use of Alternate Calibration Block Reflector Requirements 16-PDI-5

Reference:

1.

TVA letter, L.M. Mills to A. Schwencer, Request for Relief ISI-1, dated August 13, 1980, (ML073520649)

2.

NUREG-0847 Supplement 10, Safety Evaluation Report Related to the Operation of Watts Bar Nuclear Plant Units 1 and 2, dated October 1992 (ML072060473)

In accordance with Title 10 of the Code of Federal Regulations (10 CFR) 50.55a, Codes and Standards, paragraph (z)(1), Tennessee Valley Authority (TVA) is requesting the Nuclear Regulatory Commission (NRC) approval of the enclosed request for an alternative (16-PDI-5) to the requirements of the 2001 Edition through 2003 Addenda and the 2007 Edition through 2008 Addenda of the American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel (B&PV) Code Section XI, Mandatory Appendix III, Subsubarticle III-3430, Calibration Reflectors, including Mandatory Appendix III, Supplement 1, Paragraph (b)(3), for the Watts Bar Nuclear Plant (WBN) Units 1 and 2, Sequoyah Nuclear Plant (SQN) Units 1 and 2, and Browns Ferry Nuclear Plant (BFN) Units 1, 2, and 3 basic calibration blocks. Refer to Section 2 of the Enclosure for the applicable code of records.

U.S. Nuclear Regulatory Commission CNL-16-022 Page 2 May 27, 2016 ASME B&PV Code Section XI, Mandatory Appendix Ill, Subsubarticle 111-3430 states that basic calibration blocks shall have a notch depth as specified in Table 111-3430-1. Table 111-3430-1 specifies that for a nominal pipe wall thickness (t) of 0.312 to 6.0 inches, the calibration block shall have a notch depth of 0.104t - o.oogf (10% oft for austenitic and dissimilar metals welds) with a tolerance of +10% to -20%. This equates to a nominal notch depth from 5%t to approximately 10%t for ferritic materials. TVA requests NRC approval to continue to utilize calibration blocks that were fabricated with alternative notch depths of 5%t with +10% to -20%

tolerance. The 5%t calibration blocks were fabricated for TVA and result in more conservative and sensitive ultrasound examinations.

The enclosure provides a description and assessment of the proposed request for alternative, and the basis as to why the proposed alternative provides an acceptable level of quality and safety in accordance with 10 CFR 50.55a(z)(1).

TV A requests approval of this request by October 1, 2016, which is the scheduled start date for the BFN Unit 1 refueling outage because the potential exists that these calibration blocks will be used during that outage. TVA also requests that approval be granted for the remainder of plant life for BFN Units 1, 2, and 3, SQN Units 1 and 2, and WBN Units 1 and 2.

There are no new regulatory commitments associated with this submittal. Please address any questions regarding this request to Mr. Ed Schrull at 423-751-3850.

Relljll~

Ji.

1 Shea Vice President, Nuclear Licensing

Enclosure:

Request for Alternative Number 16-PDl-5 cc (Enclosure):

NRC Regional Administrator - Region II NRC Senior Resident Inspector - Watts Bar Nuclear Plant NRC Senior Resident Inspector-Browns Ferry Nuclear Plant NRC Senior Resident Inspector-Sequoyah Nuclear Plant NRR Project Manager - Watts Bar Nuclear Plant NRR Project Manager - Browns Ferry Nuclear Plant NRR Project Manager - Sequoyah Nuclear Plant

CNL-16-022 E-1 of 20 Enclosure Tennessee Valley Authority Browns Ferry Nuclear Plant Units 1, 2, and 3 Sequoyah Nuclear Plant Units 1 and 2 Watts Bar Nuclear Plant Units 1 and 2 Request for Alternative Number 16-PDI-5 I.

Systems/Components Affected Basic calibration blocks, used for ultrasonic testing (UT), are standards that provide a means to correlate an ultrasonic system with reference reflectors of known dimensions. Reference reflectors are dimensioned surfaces, used to establish accurately reproducible reference levels of ultrasonic sensitivity, resolution and sound path distance.

The basic calibration blocks are used to provide a calibration standard for ultrasonic systems used for testing thin-walled vessel (less than or equal to 2 thickness) and piping welds. This request for alternate approval is for basic calibration blocks with a nominal pipe wall thickness (t) five percent (5%)t notch depth. Attachment A provides a list of 5%t notch depth calibration blocks currently in use at TVA nuclear plants.

II.

Applicable Code Edition and Addenda

The current in-service inspection (ISI) and pre-service inspection (PSI) code of record for Browns Ferry Nuclear Plant (BFN) Unit 1 (third interval), Unit 2 (fifth interval), and Unit 3 (fourth interval) is the American Society of Mechanical Engineers (ASME), Boiler and Pressure Vessel (B&PV) Code Section XI, 2007 Edition through 2008 Addenda.

The current ISI and PSI code of record for Sequoyah Nuclear Plant Units 1 and 2 (SQN)

Unit 1 (third interval), Unit 2 (third interval), and for Watts Bar Nuclear Plan (WBN) Unit 1 (second interval) is the ASME B&PV Code Section XI, 2001 Edition through 2003 Addenda.

WBN Unit 2 is currently in the PSI period. The PSI code of record for WBN Unit 2 is the ASME B&PV Code Section XI, 2001 Edition through 2003 Addenda.

SQN Units 1 and 2 and WBN Units 1 and 2 are in the process of transitioning to the ASME B&PV Code Section XI, 2007 Edition through 2008 Addenda for their next upcoming ISI intervals.

CNL-16-022 E-2 of 20 III.

Applicable Code ASME Code Components Affected:

ASME Code Classes:

1 & 2

References:

IWA-2232 Appendix III, Subsubarticle III-3430 Appendix III, Supplement 1(b)(3)

Examination Categories:

B-F, B-J, B-O, C-F-1, C-F B-B, C-A Item Numbers:

B5.10, B5.130, B9.11, B9.12, B9.31, B14.20, C5.11, C5.12, C5.52

==

Description:==

Alternative to Appendix III Calibration Reflector Requirements Component Numbers:

ASME Class 1 and 2 components subject to examination in accordance with Appendix III of Section XI.

IV.

Reason for Request

ASME B&PV Code Section XI (see the code of record previously specified for each unit in Section II of this enclosure), Mandatory Appendix III, Subsubarticle III-3430 states that basic calibration blocks shall have a notch depth as specified in Table III-3430-1. Table III-3430-1 specifies that for a nominal pipe wall thickness (t) of 0.312 to 6.0 inches, the calibration block shall have a notch depth of 0.104t - 0.009t2 with a tolerance of +10% to -20%. This equates to a nominal notch depth from 5%t to approximately 10%t for ferritic materials.

Appendix III, Supplement I paragraph (b)(3) requires calibration blocks for austenitic and dissimilar metals welds to have a notch depth of 10%t.

The nondestructive examination (NDE) requirements were revised to comply with the 1989 Edition of the ASME Section XI Code for all nuclear sites (WBN, SQN, and BFN). This upgrade was a result of the second interval update for SQN (December 16, 1995 through May 31, 2006). The NDE upgrade provided a consistency in procedure implementation at all TVA nuclear sites. When TVA NDE requirements were revised to comply with the 1989 Edition of the ASME Section XI Code, the code requirements included use of basic calibration blocks with notch depths in the range of 5%t to approximately 10%t, depending on wall thickness. In this edition of the ASME B&PV Code, up to the 1999 Edition of the ASME B&PV Code, provisions were made in Section XI, Division 1, Appendix III, Subarticle III-1100 that allowed alternative designs for basic calibration blocks in accordance with Subsubarticle IWA-2240. Thus, some basic calibration blocks were fabricated by the Tennessee Valley Authority (TVA) with 5%t (+10% to -20% tolerance) notches for piping and vessels 2 or less in thickness versus the 5%t to approximately 10%t range of depths defined in Table III-3430-1 for ferritic material and the 10%t notch depth defined in Appendix III, Supplement 1(b)(3) for austenitic or dissimilar metal welds.

In the 1999 Addenda of Section XI, Subsubarticle III-1100 was revised to add the following phrase after the reference to IWA-2240: except when the requirements of Subsubarticle III-3430 apply. The inclusion of this phrase removed provisions for using alternative notch depths for ISI examinations performed to the 1999, or later, code year of Section XI.

CNL-16-022 E-3 of 20 Alternative calibration notch depths are required to ensure that TVA can comply with the requirements of IWB 2200(b)(2) with regards to comparing ISI results with previous ISI or PSI results. In addition, these alternative notch depth requirements will allow TVA to continue use of basic calibration blocks that were fabricated with alternative notch depths without the necessity of fabricating new blocks.

V.

Proposed Alternative and Basis for Use Proposed Alternative:

For ASME Class 1 and ASME Class 2 components subject to ultrasonic examination in accordance with ASME Section XI, Appendix III, TVA requests the Nuclear Regulatory Commission (NRC) approval to use calibration blocks with 5%t notches in lieu of the 5%t to approximately 10%t range specified in Table III-3430-I and the 10%t specified in Supplement 1 paragraph (b)(3). This does not eliminate the option for TVA to use calibration blocks with notches as specified by Appendix III.

Basis For Use:

When TVA nondestructive examination (NDE) requirements were revised to comply with the 1989 Edition of the ASME Section XI Code, the code requirements included use of basic calibration blocks with notch depths in the range of 5%t to approximately 10%t, depending on wall thickness. A technical justification and demonstrations (Attachments B and C to the enclosure) were performed in accordance with IWA-2240, which provided documented alternatives to the Supplement III notch depth requirements, by allowing the use of 5%t notches for all pipe thicknesses up to six inches.

To demonstrate that calibration blocks with 5%t notch depths provide an equivalent or better quality of examination, two demonstrations were conducted on a sampling of blocks that had both 5%t and 10%t nominal notches.

The first demonstration, conducted in 1996 before a TVA site Authorized Nuclear Inspection Inspector (ANII) Supervisor using conventional UT methods, concluded that the 5%t notches increased examination sensitivity by +2 to +6 dB. This demonstration is provided in Attachment B.

The second demonstration was performed in 2014, for the SQN site ANII, using linear phased array (LPA) techniques. This demonstration is provided in Attachment C. Similar to the demonstration in Attachment B, this demonstration concluded that the nominal 5%t notches result in a similar increase (+2 to +6 dB) in calibration sensitivity when compared to the nominal 10%t notches.

These demonstrations provide an acceptable level of quality and safety because the information and data obtained provides sufficient information to determine that applicable UT calibrations will conservatively establish a marginally more sensitive gain setting.

Therefore, pursuant to 10 CFR 50.55a(z)(1), TVA requests NRC approval for the alternate design of the calibration blocks.

Additionally, in Reference 1, TVA submitted a relief request (ISI-1) for WBN Units 1 and 2 to request the use of circumferential notches located on the I.D. and O.D. surface at a nominal depth of 5%t as reference reflectors. Relief was requested to use 5%t or optionally 10%t notches in lieu of the requirements of ASME Code Section XI, 1974 Edition, Summer 1975

CNL-16-022 E-4 of 20 Addenda. The NRC in Appendix Z, Section 3.1 of Reference 2, authorized the use of this relief request and stated, that the use of the notched calibration reflectors, and the recording and reporting level for indications for the pre-service examinations of relatively thin-walled vessel welds are acceptable alternatives to the code requirements.

VI.

Duration of Proposed Alternative and Implementation Schedule:

TVA requests that approval be granted for the remainder of plant life for BFN Units 1, 2, and 3, SQN Units 1 and 2, and WBN Units 1 and 2.

TVA requests approval of this request by October 1, 2016, which is the scheduled start date for the BFN Unit 1 refueling outage because the potential exists that these calibration blocks will be used during that outage.

VII.

Precedents:

This request for alternative is similar to alternative request NDE-R014 that was approved by the NRC for the Duane Arnold Energy Center (DAEC) in Reference 3. Specifically, the NRC approved an alternative to Section XI, Appendix III, Subsubarticle Appendix III-3430 that allowed DAEC to use calibration blocks that were procured when the plant was built. These calibration blocks had notches of various depth that deviated from the requirements of Section XI, Appendix III, Table III-3430-1.

VIII.

References

1. TVA letter, L.M. Mills to A. Schwencer, Request for Relief ISI-1, dated August 13, 1980, (ML073520649)

2. NUREG-0847 Supplement 10, Safety Evaluation Report Related to the Operation of Watts Bar Nuclear Plant Units 1 and 2, dated October 1992 (ML072060473)

3. NRC Letter, Evaluation of the Third 10-year Inservice Inspection Interval Program Plan Requests for Relief for the Duane Arnold Energy Center (TAC No. M95412), dated March 23, 1998 (ML9804010216)

IX.

List of Attachments Attachment A-Current List of TVA Calibration Blocks with Nominal 5%t Notch Depth Attachment B-Ultrasonic Calibration Standards (L18 960329 800)

Attachment C-Ultrasonic Basic Calibration Block Demonstration (N-GP-18)

(W47140528001)

Attachment A Current List of TVA Calibration Blocks with Nominal 5%t Notch Depth CNL-16-022 E-5 of 20 DocLink

GeneralDescription

ActualWall

Thickness

MaterialType

BF001

4"SCH80

0.326

A106GR.BCS

BF002

4"SCH80

0.332

A358TP304SS

BF003

10"SCH40

0.375

A106GR.BCS

BF004

6"SCH140

0.752

A358TP304SS

BF005

10"SCH100

0.730

A106GR.BCS

BF006

8"SCH100

0.767

A358TP304SS

BF007

14"pipeSch.80

0.698"

A106GR.BCS

BF010

48"x125/16"x4"

4"

A533Gr.B

BF011

61/2"x4"x4"

4"

A515Gr.70

BF012

12x3x2FlatPlate

3

A515Gr.55

BF014

3/4"SCH160

0.226"

SAI06GRBCS

BF015

10"SCH160

1.53"

A519GR.MT1020CS

BF016

20"XII"X10"NozzleBlock

Clad

10"

SA533GR.B.CS

BF018

24"X6"X6"FlatBlock

6.125"

A533GR.BCS

BF019

24"X6"X4FlatBlock

41/64"

SA533GRB.CS

BF026

12"X4".75"FlatBlock

0.75"

ASMESAI06CS

BF029

4"SCH160

0.506"

AI06GRB.CS

BF030

6"SCH160

0.754"

AI06CS

BF032

20"X9"X1"FlatBlock

1.140"

ASTM516GR70

BF034

6"sch80

0.399

A53Gr.B

BF035

8"sch100

0.520

A106GR.BCS

BF036

5"sch40pipe

0.344

A106GR.BCS

BF037

14"sch30pipe

0.364

A106GR.BCS

BF040

FlatPlate20"x97/8"x1"

0.944

A106GR.BCS

BF041

4"sch160SSPipe

0.452

SA376TP316

BF042

10"Sch80CSPipe

0.597

A106GR.BCS

BF043

FlatPlate20"x927/32"x

1

1.036

316L

BF044

FlatPlate20"x10"x1.5"

1.552

TP304

BF045

6"sch40CSPipe

0.275

SA106GA

BF046

10"Sch80SSPipe

0.588

A312TP304SS

BF048

20"Sch80SSPipe

w/Overlay

1.6875

TP304

BF049

22"Sch80Pipew/Overlay

1.342

SA240TP304

BF050

12"Sch100Pipe

w/Overlay

1.139

TP304

Attachment A Current List of TVA Calibration Blocks with Nominal 5%t Notch Depth CNL-16-022 E-6 of 20 DocLink

GeneralDescription

ActualWall

Thickness

MaterialType

BF051

12"Sch100Pipe

w/Overlay

0.947

TP304

BF052

22"x12"Sweepolet(Recirc

Loops)

0.948

SA240TP304

BF053

6"sch160SSPipe

1.122

TP304

BF054

6"sch160SSPipe

1.328

TP304

BF056

14"Sch.100CSPipe

0.938

A106GR.BCS

BF057

FlatPlate20"x47/8"x

1.25"

1.269

SS304L

BF058

1"Sch160CSPipe

0.222

A106GR.BCS

BF059

JetPump

.9229

SA182F316

BF060

5"schxxHvySSPipe

0.758

SA312T316L

BF061

6"SCH120

TP304Gr.316

BF062

4"XXSSSPipe/Weld

Buildup

1.89

SS

BF063

6"XXSSSPipe

0.840

SA312/SA376TP304

BF064

2sch160SSPipe

0.375

SA312TP304

BF065

12"Sch160SSPipe

1.345

SA376TP304SS

BF066

4"SchXXHvy

0.685

SA312

BF067

14"Sch160SS

1.339

SA376TP316

BF068

0.863"Diax12.5"

0.046

AdmiraltyBrass

BF069

10"x2"x1"FlatBlock

0.950

Carbon/SS

BF069A

10"x2"x1"FlatBlock

0.900

Carbon/SS

BF070

12"CarbonSteelPipe

SegmentWithStainless

Butter

1.32"

ASMESA376TP316

BF071

12"SCH80CladBlock

Varies

SA358GR304SS

BF072

CladBlockforNozzles

1.32

ASTMA508CL2CS

BF074

20"SCH20

0.187

SA106GrBCS

BF075

12"SCH80

0.688

SA106GrBCS

BF076

5.38"00x12"

0.846

SA508CL2

BF077

16"SCH30

0.375

SA106GrBCS

BF079

12"SCH80

0.691

SA358GR304SS

BF080

6"SCH80

0.860"

SA376TP304SS

BF082

28"DiaPipeSeg.

1.250"

A358GR304SS

BF083

28"DiaPipeSeg.

1.750"

A358GR304SS/308L

BF084

N1N2N3NozzleIR

Varies

SA508CL2

BF085

N2N5N9NozzleInner

Radius

Varies

ASTMA508CL2

BF086

N8NozzleInnerRadius

ASTMA508CL2

Attachment A Current List of TVA Calibration Blocks with Nominal 5%t Notch Depth CNL-16-022 E-7 of 20 DocLink

GeneralDescription

ActualWall

Thickness

MaterialType

BF087

20"SSPipe

1.031

SA376TP316

BF088

22"SSPipe

1.031

SA376TP316

BF089

24"SSPipe

1.285

SA376TP316

BF090

28"SSPipe

1.44

SA376TP316

BF091

6"CSPipe

0.562

ASTMA106GradeB

BF092

8"CSPipe

0.322

ASTMA106GradeB

BF093

12"CSPipe

0.843

ASTMA106GradeB

BF094

16"CSPipe

1.031

ASTMA106GradeB

BF095

18"CSPipe

0.312

ASTMA106GradeB

BF096

18"CSPipe

0.500

ASTMA106GradeB

BF097

18"CSPipe

0.938

ASTMA106GradeB

BF098

20"CSPipe

0.500

ASTMA106GradeB

BF099

20"CSPipe

1.281

ASTMA106GradeB

BF100

24"CSPipe

0.375

ASTMA106GradeB

BF101

24"CSPipe

0.500

ASTMA106GradeB

BF102

24"CSPipe

1.531

ASTMA106GradeB

BF103

24"CSPipe

2.5

ASTMA106GradeB

BF104

26"Pipe

0.950

ASTMA155KC70

BF105

30"CSPipe

0.375

ASTMA106GradeB

BF106

CoreSprayNozzle

1.358

SA508CL2

BF107

RecircOutletNozzle

1.737

SA508CL2

BF108

24"Sch.80CSPipe

1.218

A106GR.BCS

BF109

147"RadiusRVWall

6.60

SA533Gr.Bclass1

BF111

3/4"Pipe

0.154

SA376TP316

BF112

1"Pipe

0.179

SA376TP316

BF113

1.25"pipe

0.191

SA376TP316

BF114

1.5"Pipe

0.200

SA376TP316

BF115

2"Pipe

0.154

SA376TP316

BF116

3"pipe

0.300

SA376TP316

BF117

4"pipe

0.337

SA376TP316

BF118

6"pipe

0.432

SA376TP316

BF127

12"PipeUTCalBlock

0.375"

ASTMA106GradeB

BF128

20"pipeUTCalBlock

0.375"

ASTMA106GradeB

BF129

RPVInstrumentNozzleto

FlangeUTCalBlock

1.0"

ASTMA105Grade2

BF130

RPVInstrumentNozzleto

FlangeUTCalBlock

1.0"

A105Grade2

BF131

4"AxialScanUT

2"

304SS

BF132

4"CircumferentialScan

Varies

304SS

Attachment A Current List of TVA Calibration Blocks with Nominal 5%t Notch Depth CNL-16-022 E-8 of 20 DocLink

GeneralDescription

ActualWall

Thickness

MaterialType

BF133

FlatProbeUT

3.00

304SS

BF136

3"ContourBlock

1.00

316/316L

BF137

3"CircumferentialScan

1.00

316LSS

BF138

28"/29"OD/IDAxialScan

3.9

304SS

BF139

28"ODCircScan

2.4

304SS

BFN134

12"AxialScan

2.92

304SS

BFN135

12"SSCircumferential

Scan

1.27

304SS

IRCSCL38PEB

O.DInnerRadiusUTCal

BlockN1N2N3N4N5

Varies

SA508CLII

SQ001

6"SCH160

0.707"

TP304SS

SQ002

6"SCH160

0.707"

TP304SS

SQ003

12"SCH140

1.209"

TP316SS

SQ005

32"Dia.PipeSeg.

1.429"

A516GR.70

SQ006

2"SCH160

0.340"

TP304SS

SQ007

8"SCH120

0.760"

TP304SS

SQ008

12"SCH80

0.764"

TP316SS

SQ009

8SCH80

0.311"

A312TP316SS

SQ010

14"SCH160

1.358"

A312TP304SS

SQ012

2.5"SCH160

0.430"

A312TP304SS

SQ013

4"SCH120

0.436"

A312TP304SS

SQ014

12"X4"X1.5"FlatBlock

1.5"

A516GR.70CS

SQ015

12"X4"X1"FlatBlock

1.022"

TP304SS

SQ016

12"SCH160

1.310"

A403WP316SS

SQ017

6"SCH120

0.580"

A276TP304SS

SQ018

18"SCH80

0.977"

A333GR.1CS

SQ019

6"Dble.E.H.

0.875"

A106GR.BCS

SQ020

1.5SCH160

0.324"

A376TP304SS

SQ021

10"Pipe1.5"Thick

1.50"

SA106GrBCS

SQ029

6"Dia.PipeSeg.

1.2"

304SS

SQ030

5"Dia.E.H.

0.897"

304SS

SQ037

TransferredtoBFNP

0.502

A36A283

SQ039

18"SCH40

0.640"

304SS

SQ040

12"X6"X3"VesselBlock

3.0"

SA533GR.ACL2CS

SQ041

12"X6"X4"(3/16Clad)

Vessel

37/8"

SA533GR.ACL2CS

SQ043

22"X6"X6"(7/32Clad)

Vessel

513/16"

A508CL2CS

Attachment A Current List of TVA Calibration Blocks with Nominal 5%t Notch Depth CNL-16-022 E-9 of 20 DocLink

GeneralDescription

ActualWall

Thickness

MaterialType

SQ044

33"X6"X811/16"(1/4

Clad)Vessel

811/16"

A508CL2CS

SQ045

43"X6"X11"(5/16Clad)

Vessel

111/8"

A508CL2CS

SQ046

27"X6"X7"(7/32Clad)

Vessel

71/16"

A508CL2CS

SQ049

15"X6"X5"(1/4Clad)

5"

SA216GR.WCCCS

SQ050

101/2"O.D.X7"I.D.Nut

Block

1.75"

SA540GR.B24

SQ051

12"X6"X6"(3/16"Clad)

529/32"

A508CL2CS

SQ053

26"X23"X6"(3/16Clad)

Nozzle

Varies

A508CL2CS

SQ054

16"Rad.(1/4Clad)

Varies

A508CL2CS

SQ055

21/2"Dia.x93/4"Stud

Stud

A193GR.B7CS

SQ056

LetdownHeatExchanger

Block

0.428"

AISITP304SS

SQ057

24"X6"X4"VesselBlock

4"

SA533GR.ACL1CS

SQ058

3/4"Dia.X135/8"

.049"

AdmiraltyBrass

SQ059

SGPrimaryNozzleI.R.

W/Clacd

16.0"

A216GR.WCCCS

SQ061

S.G.FeedwaterNozzle

.837"

A333GR.1CS

SQ062

S.G.NozzletoTransition

Spool

0.6

SA508CL.2CS

SQ065

3"Dia.BranchConnection

1.313"

A182,F316SS

SQ066

6"Dia.BranchConnection

1.85

A182,F316SS

SQ067

10"Dia.BranchConnection 2.490"

A182,F316SS

SQ068

16X16"X4"RCPFlywheel

Block

3.75"

SA533,GR.BCS

SQ069

4"Dia.BranchConnection

1.530"

A182,F316SS

SQ070

8"Dia.BranchConnection

2.090"

A182,F316SS

SQ071

12"Dia.BranchConnection 2.99"

A182,F316SS

SQ072

4"Dia.LiftingRig

4.00"

A322,GR4340

SQ073

4"Dia.LiftingRig

4.00"

A322,GR4340

SQ074

4"Dia.LiftingRig

4.00"

A322,GR4340

SQ075

3.5"Dia.LiftingRig

3.50"

A564,GR630

SQ076

Mainsteam/Feedwater

NozzleI.R.

14"

A508CL.2

SQ077

PressurizerNozzleI.R.

13.624"

A508CL.2

SQ078

FlywheelCal.Block

4.5

SA533GrB

SQ079

4"CSSch80Cal.Block

.337

A106GR.BCS

SQ080

UHIInconelCalBlock

.531"

ASMESB166

Attachment A Current List of TVA Calibration Blocks with Nominal 5%t Notch Depth CNL-16-022 E-10 of 20 DocLink

GeneralDescription

ActualWall

Thickness

MaterialType

SQ081

UHIStainlessCalBlock

.527"

ASMESA479

SQ082

CRDMInconelCalBlock

.625"

ASMESB166

SQ083

CRDMStainlessCalBlock

.622"

ASMESA479

SQ085

2"Sch80Cal.Block

.210"

SA376304

SQ086

3"Sch80Cal.Block

.308"

SA376304

SQ087

3"Sch40Cal.Block

.214"

SA376304

SQ088

4"Sch80Cal.Block

.370"

SA376304

SQ089

16"Cal.Block

.400"

SA358304

SQ090

20"Cal.Block

.420"

SA358304

SQ091

24"Cal.Block

.407"

SA358304

SQ092

3.38"MainSteamCalBlock 3.38"

ASTMA105

SQ093

14"Sch40CalBlock

.438"

SA376GR304

SQ103

2.35fX13.5

Stud

ASTM193,GRB6

SQ104

12x6x.75FlatBlock

.75

TP304SS

SQ105

12x6x.5FlatBlock

.5

TP304SS

SQ106

12"x4"X.75"SSCLADFLAT

BLOCK

.775"

SA515,GR70

SQ108

18"x6"x3"FlatBlock

3.00"

SA508,CL.3.

SQ110

27"x7"CLADBLOCK(0.2")

7.00"

SA508,CL.3

SQ111

CLADSGNOZZLEBLOCK

I.R.

9.00"

SA508,CL.3

SQ112

25"x7.5"NOZZLEBLOCK

7.54"

SA336F316LN

SQ113

12"X10"FWNozzleIR

Varies

SA508,CL3

SQ124

9.75"X6"X0.750"

ASTMA36

SQ131

8Ax.OverlayCalBlock

2.000

304SS

SQ132

16Ax.OverlayBlock

2.000

304SS

SQ133

FlatOverlayBlock

3.000

304SS

SQ134

8CircScanOverlayBlock

2.248

304SS

SQ135

16CircScanOverlayBlock

2.500

302SS

SQ136

6Circ.ScanOverlayBlock

1.617

304SS

SQ137

6"AxialScanOverlayBlock

2.502

305SS

WB001

6"SCH160Pipesegment

0.715

SA376TP304SS

WB002

8"SCH160PipeSegment

0.942

SA376TP304SS

WB003

12"SCH140PipeSegment

1.158

SA376TP316

WB004

16"SCH80PipeSegment

0.754

SA333GR.6

WB005

16"SCH140PipeSegment

1.410

SA515,GR70

WB006

2"SCH160

0.346

TP304

WB007

8"SCH120PipeSegment

0.758

TP304

WB008

12"SCH80PipeSegment

0.767

SA376TP316

WB009

8"SCH40PipeSegment

0.307

A312TP316SS

Attachment A Current List of TVA Calibration Blocks with Nominal 5%t Notch Depth CNL-16-022 E-11 of 20 DocLink

GeneralDescription

ActualWall

Thickness

MaterialType

WB010

14"SCH160

1.352

A312TP304SS

WB011

3"SCH160PipeSegment

0.450

304H

WB012

2"SCH160PipeSegment

0.395

SA376TP304SS

WB014

1.5"FlatBlock

1.482

SA516SR70

WB015

1"FlatBlock

1.028

SA376TP304SS

WB016

12"Sch160SSPipe

1.322

SA376TP304SS

WB017

5"Sch160Pipe

0.585

SA403WP315

WB018

18"SCH80Pipe

0.938

SA333GR.6

WB019

5"schxxHvyPipe

0.782

A106GR.BCS

WB020

11/2"SCH160Pipe

0.312

SA376TP304SS

WB021

10"Pipe1.5"Thick

1.493

SA106GrBCS

WB027

2"RoundBar

2.00

SA193GRB7

WB029

4"PipeSegment

1.206

SA376TP304SS

WB030

3"PipeSegment

0.918

SA376TP304SS

WB033

10"x1"thickpipesegment 1.005

TP304

WB034

12"pipesegment

1.247

TP304

WB037

6"SCH80

0.433

SA53GrB

WB038

8"Sch.80

0.484

SA106Gr.B

WB039

Vessel

4.015

SA533GRACL2CS

WB041

12"Sch40SPipeSegment

0.363

SA312TP304

WB042

18"Sch30PipeSegment

0.431

SA403TP304

WB043

18"SCH40PipeSegment

0.641

SA240TP304

WB044

2.15"ThickBar

2.15

SA240TP304

WB045

2.5"diax10"longStud

2.5

SA193GRB7

WB046

14"Sch40PipeSegment

0.470

SA358GR304SS

WB052

CRDMStainless/Inconel

Block

0.626

SA182TP304/ASME

SB167

WB053

3"thickSafeEnd

3.00

SA182TP304/SA508

CL.2

WB061

2"Sch80PipeSegment

.225

SA376TP304SS

WB062

3"Sch40PipeSegment

0.265

SA376

WB063

3"SCH80PipeSegment

0.287

SA376TP304SS

WB064

4"SCH40PipeSegment

0.268

SA376TP304SS

WB065

4"SCH80PipeSegment

0.343

SA376TP304SS

WB066

14"PipeSegment

0.370

SA358TP304SS

WB067

16"PipeSegment

0.395

SA358TP304SS

WB068

20"PipeSegment

0.414

SA358TP304SS

WB069

24"PipeSegment

0.400

SA358TP304SS

WB071

UpperInjectionNozzle

0.785

SB168TP600

WB072

UpperInjectionNozzle

0.785

SA479304L/SA182

Attachment A Current List of TVA Calibration Blocks with Nominal 5%t Notch Depth CNL-16-022 E-12 of 20 DocLink

GeneralDescription

ActualWall

Thickness

MaterialType

WB073

CRDMPipeSegment

0.625

SB168TP600

WB074

CRDMPipeSegment

0.625

SA479304L/SA182

WB075

RecircCoolantPumpBolt

4.5

SA540E4340H

WB077

NozzletoShellUT

2.5/1.0

CNL-16-022 E-13 of 20 Attachment B Ultrasonic Calibration Standards (L18 960329 800)

CNL-16-022 E-14 of 20 Tennessee Valley Authority. Post Office Box 2000, Soddy-Daisy. Tennessee 37379-2000 L 18 960329 800 March 29, 1996 Mr. Ernest Farrow Hartford Steam Boiler Inspection & Insurance Co.

200 Ashford Center North, Suite 300 Atlanta, GA 30338-4860

Dear Mr. Farrow:

ULTRASONIC CALIBRATION STANDARDS

Purpose:

The purpose of this memorandum is to state TVA's position regarding calibration block design and provide justification \\vhy.existing calibration standards surpass current requirements established by the ASME Section XI Code, 1989 Edition.

Background:

Ultrasonic piping calibration blocks for Browns Ferry baseline examinations were fabricated to the 1971 Edition of the ASME Section XI code. These blocks contain 5% sawtooth notches. In addition, baseline calibration blocks for Sequoyah and Watts Bar were fabricated to the 1974 Edition with Surruner 1975 Addenda of Section XI with similar calibration notch design (i e., 5%

notches) for a majority of piping applications.

Ultrasonic calibration blocks for TV A nuclear sites (Browns Ferry, Sequoyah, Watts Bar) continue to be fabricated to the requirements of ASME Section XT with 5% circumferential and axial notches for a majority of austenitic and ferritic applications. Bellefonte calibration blocks used at other TV A sites are reviewed by the inspection agency when used in a specific application.

[n some cases, the calibration standards for austenitic piping may contain 10% notches (e.g..

centrifugal cast piping).

The nondestructive examination (NOE) requirements were recently revised to comply >vith the 1989 Edition of the ASME Section XI Code for all nuclear sites (WBN. SQN and BFN) This upgrade was a result of the second interval update for Sequoyah. The NDE upgrade provides a generic consistency in procedure implementation at all TV A nuclear sites c:mlt/Icttcrs

CNL-16-022 E-15 of 20 L

(

'\\._,,

}\\pplicable Code Requirement Section XI Subsection IW A-2232 requires that ultrasonic examinations be conducted in accordance with Appendix I. The requirements for vessel welds less than or equal to 2 inches in thickness and all piping welds are contained in Appendix ill, as supplemented by Appendix I. The requirements for calibration reflectors are contained in Article III-3430 with reference to Table ill-3430-1 and Appendix ill Supplement 4 for austenitic and dissimilar metal welds.

Applicable Components Full penetration butt welds and adjacent base metal in piping systems having a nominal wall thickness of 0.2 to 6 inches. Vessel welds less than or equal to 2 inches in thickness.

Description of Condition The 1989 edition of the ASME Section XI code currently requires that calibration blocks contain notches within tolerances described in Appendix I and Appendix ill. A majority of piping calibration blocks contain 5% notches which are determined to be conservatively outside the limits of Table ill-3430-1 and Appendix ill Supplement 4, as applicable.

Technical Justification Currently TV A has continued with this conservative measure of using notches less than code requirements due to the following reasons:

Current examination results are compared with previous examination data in order to determine if significant change has occurred (i.e., greater than +6dB). If calibration blocks are remachined to comply with 1989 Section XI tolerances then current results are not comparable.

The cost to machine deeper notches is not justified and provides no value add to the current Inservice Inspection Program examinations.

Appendix III, Article ill-3430 of the ASME Section XI code 1989 Edition makes provision for an acceptable alternative block design. In addition, IW A-2240 Alternative Examination methods may be substituted for the methods specified in the applicable Division, provided the results are demonstrated to be equivalent or superior to those of the specified method. Where alternative methods (i.e., the use of 5%

notches) have been demonstrated, the Inspection Agency review has been documented and found to be equivalent or superior.

Examination sensitivity is increased by + 2 tp +6 dB when using 5 % notches as compared to 10% notches.

TV A procedures require any flaw regardless of amplitude to be recorded.

Sizing of a flaw is not based on reference sensitivity of the notch but actual satellite pulse signals which accurately locate the flaw tip.

c:mltlletters

CNL-16-022 E-16 of 20 L

L

~onclusion :

TV A's position concludes that the ASME Section XI code contains the requirements essential for the examination of piping and components. More conservative measures (notches that are below the maximum code allowable) are deemed to comply with ASME Section XI. The proposed alternatives do not compensate a decrease in the level of quality and safety. We request that you review the subject position and concur with the technical basis stipulated. Any questions may be directed to myself at (423)843-4355.

Manager, Ultrasonic Group Inspection Services Organization STC 11-SQN cc: George Deaton, CFC lA-BFN Bruce Eamigh, WBN Albert Ladd, CFC lA-BFN Tom McGovern, SQN Neal Jackson Charles Metcalf Bill Rice c:mlt/letters

CNL-16-022 E-17 of 20 Attachment C Ultrasonic Basic Calibration Block Demonstration (N-GP-18) (W47 140528 001)

CNL-16-022 E-18 of 20 W47 140528 001 ULTRASONIC BASIC CALIBRATION BLOCK DEMONSTRATION (N-GP-18)

Purpose:

The purpose of this demonstration is to document equivalency (or better) of the typical TVA Basic Piping Calibration Block designs compared to the ASME design defined in ASME Section XI, App_endix Ill, Paragraph 111-3430 {2001 Edition through 2007 Edition with 2008 Addenda). This demonstration is applicable to examinations performed to meet the requirements of Section XI, Appendix VIII.

Background:

Ultrasonic piping calibration blocks for Browns Ferry baseline examinations were fabricated to the 1971 Edition of the ASME Section XI code. These blocks contain 5% saw-tooth notches. In addition, baseline calibration blocks for Sequoyah and Watts Bar were fabricated to the 1974 Edition with Summer 1975 Addenda of Section XI with similar calibration notch design (i.e., 5% notches) for a majority of piping applications.

Ultrasonic calibration blocks for TVA nuclear sites (Browns Ferry, Sequoyah & Watts Bar) conti.nue to be fabricated to the requirements of ASME Section XI with 5% circumferential and axial. notches for a majority of austenitic and ferritic applications. Bellefonte calibration blocks used at other TVA sites are reviewed by the inspection agency when used in a specific application.

In some cases, the calibration standards for austenitic piping may contain 10% notches (e.g., centrifugal cast piping).

When the nondestructive examination (NOE) requirements were revised to comply with the 1989 Edition of the ASME Section XI Code for all nuclear sites (WBN, SQN and BFN), the requirements included use of Basic Calibration Bl.eeks with 10% notches. A technical justification and demonstration were performed in accordance with IWA-2240 (Ref: L18 960329 800), which provided documented alternatives to the 10% notch requirement, by allowing the use of 5% notches.

Applicable Code Requirements:

Section XI Subsection' IWA-2232 requires that ultrasonic examinations be conducted in accordance with Appendix I. For all piping welds, Appendix I requires compliance with Appendix VIII, with no additional Appendix I Supplements.

Most Generk POI and vendor piping procedures that are qualified in accordance with Section XI, Appendix VIII allow for the use of the Basic Calibration Block, designed in accordance with Section XI,

CNL-16-022 E-19 of 20 W47 140528 001 Appendix Ill. However, Appendix VIII also offers provisions for alternative calibration methods, provided equivalency (or better) is demonstrated for each applicable angle and sound mode.

Applicable Components:

This demonstration is applicable to fuH penetration butt welds and adjacent base metal in piping systems, with UT requirements defined by Section XI, Appendix VIII.

Problem Statement:

In the 1998 Edition with 1999 Addenda of Section XI, Appendix Ill, Paragraph 111-llOO(c) [111-llOO(d) in later Editions and Addenda], an additional statementwas added which restricts the use of IWA-2240 for notch dimensions. However,Section XI, Appendix VIII, Vlll-4300 provide a means of demonstrating equivalency (or better) of alternative calibration methods for exams performed in accordance with Section XI, Appendix VIII. Thus, PER 833069 was written to address these additional demon.stration requirements.

Technical Justification:

Currently TVA has continued with this conservative measure of using notches shaflower than code requirements due to the following reasons:

Current examination results are required to be compared with previous examination data in order to determine if significant change has occurred (Appendix VIII, Vlll-2100). If calibration blocks are re-machined to comply with Section XI tolerances then the results will not be comparable.

The cost to.machine deeper notches is not justified and provides no value added to the current In-service Inspection Program examinations.

Re-machining basic calibration blocks runs the risk of compromising the specimen (i.e. cutting to deep).

Appendix VIII, Article Vlll-4300 of the ASME Section XI code makes provision for acceptable alternative calibration methods. This may be done without requalification of the procedure.

TVA procedures require any flaw regardless of amplitude to be recorded.

Sizing of a flaw is not based on reference sensitivity of the notch but actual satellite pulse signals which accurately locate the flaw tip.

CNL-16-022 E-20 of 20 W47 140528 001 Demonstration Process:

This demonstration was conducted on 5/28/2014.

Equipment was selected and calibrated in accordance with N-UT-84, Revision 0002, which incorporates EPRl-PIPE-MPA-1, Rev 0 (EPRI TR 1016650).

Calibration was performed using a longitudinal and a shear wave transducer on basic calibration block number BF-31.

Signal response was observed from the 5%T circumferentially oriented ID notch for the following angles:

o Longitudinal Mode: 40-70 degrees in 1 degree increments o

Shear Mode: 30-70 degrees in 1 degree increments The process was repeated for each angle and sound mode on the 10%T circumferential ID notch and the sensitivity was compared to that of the 5%T notch.

For each angle and sound m_ode observed, the sensitivity level was higher for t~e 5%T notch compared to that of the 10%T notch.

Conclusion:

Based on the results of this demonstration, TVA concludes that the use of 5%T notches in the Basic Calibration Blocks used for Section XI, Appendix VIII purposes are acceptable and comparable - or better

- in sensitivity to those described in Section XI, Appendix Ill, Paragraph 111-3430. Thus, these calibration blocks are deemed to comply with ASME Section XI, Appendix VIII, paragraph VIII-4300. Should future Appendix VIII examinations include requirements for angles or sound modes outside of those documented in this demonstration, then additional demonstrations may be necessary contingent on the code of record used at that time.

c-00111011 pr,*e.sffey TVA UT Level Ill Date ANll Concurrence Date