ML20078H441

Forwards SGs 12 & 22 Flaw Evaluations for Prairie Island Units 1 & 2,respectively.Nonproprietary & Proprietary Handbooks on Flaw Evaluations for Prairie Island SGs & Pressurizers Also Encl.Proprietary Handbook Withheld

ML20078H441
Person / Time
Site:	Prairie Island
Issue date:	01/31/1995
From:	Richard Anderson NORTHERN STATES POWER CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML20078H443	List: ML20078H441 ML20078H453
References
NUDOCS 9502060211
Download: ML20078H441 (43)

Text

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Northem States Power Company Prairie Island Nuclear Generatin2 s%rit 1717 Wakonade Dr. East Welch, Minnesota $5089 January 31, 1995 10 CFR Part 50 Section 50.55a l

U S Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555 PRAIRIE ISLAND NUCLEAR CENERATING PLANT Docket Nos. 50-282 License Nos. DPR-42 50-306 DPR-60 Steam Generrtor Weld Indication Evaluations By letter dated December 20, 1994, we submitted for your review the results of analytical eva' .tations of flaws detected in #11 and #12 steam generators.

These flaws were detected during inspections in accordance with ASME Boiler and Pressure Vessel Code Section XI. The evaluation results were submitted several month after the evaluations had been performed because we had just recently become svare of the Code requirement for submittal of the evaluations. In that submittal, we stated that we would complete a review of other inspections by icnuary 31, 1995; if we determined that other evaluations would have required submittal, we would submit those at that time.

We have completed our review end determined that there are two additional flaws (ono on steam generator # C a.nd the other on steam generator #22) that needed evaluation and need to be submitted. These evaluations are attached to this letter.

In addition, since the December 30, 1994 submittal, discussion with the NRR Project Manager for Prairie Island prompts us to submit two Westinghouse reports which are referenced by the flaw evaluation summaries. These attachments are handbooks on flaw evaluations for Prairie Island steam generators and pressurizers.

Please contact Jack Leveille (612-388-1121, Ext. 4662) if you have any

,u.st1_ re1atee to s 1. er.

,' y pt( &d .

Roger 0 Anderson f' ((,w\

Director Licensing and Management ssues

! c: (see next page) 9502060211 95og3g PDR g

( ADOCK 05000282 .

PDR ( ,

J USNRC NORTHERN STATES POWER COMPANY January 31, 1995 Page 2 c: Regional Administrator - Region III, NRC Senior Resident Inspector, NRC NRR Project Manager, NRC J E Silberg (w/o the WCAPs)

Attachments:

1. #12 Steam Generator Flaw Evaluation for ISI Report 94-0128, Prairie Island Unit 1, January 31, 1995 (19 pages)

2. #22 Steam Generator Flaw Evaluation for ISI Report 89-364, Prairie Island Unit 2, January 31, 1995 (24 pages)

3. Westinghouse WCAP 13032, Handbook on Flaw Evaluation, Prairie Island Units 1 and 2 Steam Generators, Upper Shell to Dome Weld Region, July 1991

4. Westinghouse WCAP-14166, Handbook on Flaw Evaluation for Prairie Island Units 1 and 2 Steam Generators and Pressurizer, January 1995 9

FLAWEVA1. DOC

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1. 12 Steam Generator Flaw Evaluation for ISI Report 94-0128 Prairie Island Unit 1 January 31,1995 l

1

e e4 9.wa6M / 2. tilaw N mberISI Fisw Disposition Werksheet s t/' '

l

~ -o/LM 3. Item Nurnter

1. ISI Report Num}be{9'-cRyb (fI ,

, l CIJO 14.l%tal Number of Pages 2. ,

4.lSilaterval 5 OK Reviewer M [ 5. Code Edition and Addenda EOK Reviewer /4 O second interval D th!;d iitti tval Q/preservice O 80 W81 0 8ino addenda C5V89 no addelija O other l

6. Acceptance Standard EOK lieviewer M.

O IWB-3510 p IWB-3511 O IWB-3512 O IVB 3514 O IWB-3515 O IWB-3516 0 IWB-3518 gA / O IWB-35 u IWB-3523 O IWC-3511 O IWC-3512 O IWC 3513 O IWC-3514 O IWC 3515 l

/ O IWC-351

7. Calculations 5 OK Reviewer I.

' i F m b irt W ) nc me my w&t - b t. r u* ", s = oM " l 6,,,,, e f./h ' ,

I f o. ?f '

l2Nu 40 litV<hmmV l raw GR( 6 cl1W ho'AY b 6 om' h: kr9 j [ ,, Q @ j f ,.

od9I f -= OY 1 o t tI~ U 56B c.69 2.,93 "2 . c.r ET  : o. FD'o e o. tr 4/ > o. o Nw 3,

[ 7.66 pgM w oces' bAQ % o.or  ;

~~ l O. lOUT PansA s o. n o N 2: o. u'.~ vtaa 1 [ -. e r D a.

. st % he 0 -

O.# u 5 c.W 7/2d[

00* 9 5 k urs % AcrMble &

MY N k#bMC.,.

• l

8. Results CE OK Reviewer J '.

, c/t = //d calculated a/t %=' C.o %

Code allowab Ja/t%= A/A laminar flaw su ace area: (0.7f f I + w) = A/d Mable used for analysis El OK Reviewer  ; W D IWB-3510-1 0 IWB-3510-2 O IWB-3510-3 O IWB-3511-1 0 1.VB-3511-2 O IWB-3512-1 O IWB-3512-2 1.!) IWB-3514-1 O IWB-3514-2 O IWB-3514-3 O IWB 3514-4 O IWB-3514-6 O IWB-3515-1 O IWB-3516-1 O IWB-3516-2 O IWB-3518-2 ,

O IWC-3510-1 O IWC-3510-2 O IWC-3510-3 O IWB-3518-1 [

O IWC-3511-If O IWC-3511-2 O IWC-3512 2 j O IWC-35131 , //

10. Was linear interpolation used? O yes [ Tao if no, why? Mr Acce

11. Was IWA 3200 Significant Digits For Limiting Values folio ed? g,yes O no E oK Reviewe w //' \/

}

M* If i, why?

12.The correct Code Edition and Addenda was available and sed. O yes Prepa r OK R[ viewer //[ fM

13. Statement of acceptabihty or rejectability with basis M OK Reviewer ___ f f . I

$ Accept. O (a/OCode allowable 2(a/Odalculated l 0 Reject. (0/DCode allowable < (0/Ocalculated

$1 OEM flaw eva uat>onfiandbook (see attached analysis)

15. Prepared by and da:e 1(,Eng ne ing re w by and date 17. Approved by and date

(' l F)h5

/g7 f S4 $$g*,

oC., I. r </y N / -[

hos nv e o suuret that she nnuks are tor ~a e W the meUnkdogy 7ku at'pec.ulasswes thor alt brewdved wth thispaw sistant amtpaw

&npastrian were amore of the artessnty that the itsadLt ered 8he nardis 4 f xcewamce wth appheable to n s:amkrok meshus4> logy are correct amt in accordmco wth applicable cairs, The ren.hs are correct amt the meshuddogV arsedis he accorrkgree wth specipco {orus end proceerns stamkedt specofenssions aufproco hores apphensble senarn starsaards sprerfsarrea nmiproce.hores REvlsl0Nlo W 4l l NSF O'uSNGNsNSIFDWR0 DOC tSi Flaw DisposWon Worksnect itsvision 0 -

f-y pffpN &ifbLb (2.g et 9e/ uw6 (Db

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A9+1 &l u t n-W [$ ff M LA>Gif /t/t d (Of V t) l}rtAckrat f- ) p9p lch l Surface / Embedded Flaw Demarkation Une 0.13 -

- Embedded Flaw .

C5- - -

- Configuration bi 5

g FLAWS WITH alt AB WmlS UNE ARE 0 12 '

--'..; , f_ NOT ALLOWABLE

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0.11 e I

.; +  ;

f

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. - .ifW _:il,;.

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10, 20, 30 yrs.

0.1 I M

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2 E:

3 0.09 f' f

~ 0.08 .- ,-

.Qsg 5:

V ;ag.;: _-

3: .. of ,

3 '-Surf ace ; f;

u. o,07 .-

Flaw In thle -

O jRegion Must be [ _ :_i E 0.Os EC

"*'d

• d **- ' ~~

"O ISurfeoe x'

-: 1 g IFlaws  ; -

-bg - F/Av

• I

=: 0.05 _-Im.: -

cg .o -

0.04 .-

?! \ >

ALL EMBEDDED FLAWS J

(ON THIS SIDE OF 0.03 DEMARKATION UNE)

f

' ARE ACCEPTABLE PER

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CRITERIA 0F IWB 3600 0.02 _~ AS LONG AS 2a/tso.25 j 0.01 -

+

N'h z

_- l :: h h ,4 '

0 1 0 0.025 0.05 0.075 0.1 0.125 0.15 0.175 0.2 0.225 0.25  !

Distan'ce from Surface (6/t)  !

Figure A-6.4 Flaw Evaluation Chart for the Upper Shell-Cone Weld for i Prairie Island Units 1 and 2 j X Inside Surface Surface Flaw Longitudinal Flaw X Outside Surface X Embedded Flaw X Circumferential Flaw 1

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' ilSI Fhw Disposition Worksheet?

1. ISI Report Number -orgG Q*,,, f j 2. Flaw Number 3. Item Number 1/. Total Number of Pages Pl 1 9tV- out . I I ClJO l I 4.1S1 Interval MOK Reviewer,,,,_]U. 5. Code Edition and Addenda ETOK Reviewer 4f O second interval Ethird intcrval O preservice O 80 WB1 O 86 no addenda R 89 no add /nda O other

6. Acceptance Standard O OK Reviewer O IWB-3510 O IWB-3511 O IWB-3512 O IWB-3514 O IWB-3515 O IWB-3516 O IWB-3518 O IWB 357 O IWB-3523

/ N IWC451 O IWC-35 t l O IWC-3512 O IWC-3513 O IWC-3514 O IWC-3515 7.Cdculations El OK Reviewer F.

Fem diskM stc pk ps, v a r b nu ~ , e east", r, - 2.m-D car " ,

• Type = Abww nw 1 s. 0 /Br o. I6 V'l /2cw,) +.> o.s 6 f4 - r21 6/ A Cl 1 = 50 k'G ysf/1 4 I.I24

<p, , o.it[ ,y, S;'.o ta t? adh k Co % U5/9

• o.7 4~ ,

'/.a~ pt,o 7.66 "" W Le+- W I,o lhw 1rds&tTios't fM1 Thla\s .wt. 15"lO-/ ,h Subsu4)&c h =

'f.9 6 o.tL-ulf (.c3-YR) a Cos --v s ,1 %

v m na n't -"

W 6 = 1.r bra 6 2 v.o 94 v. , z. y p o,g, ,o.tr ( r. s -t.t) , t.%, -- x..o 6.w. ..

• * * '3' o.1C 't'. 't' 29 p..o .Ic o./ 6 g.l 7. 4 3.o 9/(% s:,; 4 3.4s . t c OL,, .r.)) . m -, f. .f

( ua v.. . 2 s' Mo C.7 3,3  % , o,,

% dWC*tWcb E C~,0 % h y1%$V Qi4A Y CQ.a & " 1 V So N Y *1A b , oK ' e>4 t

'Thh / A /vrf % h AJ edd le uth 9 tis eMM. ,

Q. Results S OK Reviewer

/.

alt = o.IL calculated c/t %= S~o 1.

Code allowab a/t%= 2 '/' 'h laminar flaw surface area: (0.7 1

• w) = //M

9. Table used for analysis t'l OK Reviewer _,.f -

O IWB-3510-1 ] IWB-3510-2 O IWB-3510-3 O IWB-35111 O IWB-3511-2 O IWB4512-1 O IWB-3512-2 ] IWB 35l4-1 O IWB 3514 2 O IWB 3514 3 O IWB-3514-4 O IWB-3514-6 O IWB4515-1 O IWD 3516-1 O IWB 3516-2 O IWB-351 'I O IWB-3518-2 liit;1WC4510-1 O IWC-3510-2 O IWC-3510-3 O IWC-351 1 O IWC-3511-2 O IWC-3512-2 O IWC 3513-1 /

10. Was imear mtegolation used? )6yes O no If no, why?

11. Was IWA 3200 Significant Digits For Limiting Values followed7 y yes O n PJ OK Review [/' If ,why?

12.The correct Code Edition and Addenda was available anpused. hityes Prep er McA- OK IUeviewer .__

13. Statement of acceptability or rejectability with basis O OK Reviewer __W O Accept. O (a/OCode allowable 2 (a/Ocalculated J4 Reject. (0/OCode allowab1p < (0/Ocalculated O OEM flaw evalupti[n handbook (see attached analysis)

15. Prepared by and date .Ehg icering r . ew by and date 17. Approved by and date 7 [. / . E d. 9f' s d This op,nro.nlaswrrs that al!howstved wnh thaf!aw ming oruljksw

'n rra smess thun ihr vealu are enr*rci multhe methmAdogy & gnuinon were aware of the necessay that the ressolu armt the The rewhs are corrvrt as=d the norsha>Jogy nivda kr accordsee wuh i sait 'r > aardwice w'th <ppaca6/e ccwJrs ssor=Ards. avt%Adogy are corrver ar=f m accordpre with ayap/xchte rudra, arrheaMe emk e, numkardt sywrofocurrarse amtprwe, lures &sh < tiera mal procedur*

• sknnhwds, wec$carrara nousproceanres N

l NSP o \l5NGN5NSiFDWR0 DOC 151 Flaw Disponsoet worksheet Revision 0 - REVISION 14%94 l

{$rRMuhiMhWcM# NDEMISI Fla& Sizing;Workshiet;? ' fagf M& ' $n "iMMy&qg 1.151 Report Number 2. Flaw Humber 3. Item Number IA r 5. Code Edition and Addenda f;d,OK Reviewer _W 6. Method M UT U RT 4.lSlinterval flOK Reviewer O PT O MT O 2nd interval p(3rd interval O preservice O 80 W81 0 86 nc addenda k 89 no addenda O other

7. Flaw Sketch bit,0K Reviewer _ tse-g#- N f 7,,

• Front View b

4 h<-- /.M6M g eg "

o. w' O 1 0.1s " v h

Top View Q l

I

, flo so , .

^

>, s c I

I Side View I

, 00N s s i I

e i

8. Calculations MOK Reviewer _ Qi2~"-

Show determination of surface or subsurface M & 4.

Show determination of type of"a" to use

$d2d. CL

9. lSI FE-1 Paragraph - "Rounding-Off Method" was used. Nyes PreparerM VOK Reviewer [

10. Code Flaw Dimensions 6 OK Reviewer VEU

"( " = 1. /2 5 "a" = 0, j g 5 "t " = 1. lo S "f .,,.." = WA 7" = 0,1 f  %" = g/A

!!. Flaw Type MOK Reviewer WG O Surface Planar (UT/RT) D64ubsurface Plan T) O Laminar (UT/RT) O Linear (PT/MT/RT)

12. Flaw Characterization Figure KOK Reviewer .C D IWA 3310-1 O IWA 3330-1 O IWA-3350-1 O IWA-3380-1 O IWA-34001

%IWA-3320-1 O IWA-3340-1 O IWA 3360-1 O IWA 3390-1 +

13. Flaw Characterization Figure Number KFlaw 1 O Flaw 2 O Flaw 3 O Flaw 4 O Flaw 5

14. Was (WA 3300 Flaw Characterization followed? K yes O no If no, why? ,

15. The correct Code Edition and Addenda was available and used. N yes Preparer D J KOK Reviewer g

16. Prepared by and date 17. Review by and date TLfl 2, Q ${

~ .. - .

& , ~ -.t oa itkzh1 r.,-. .n.a,. . - ~ .-..,~.

..ws

..,-, .n - - n spreifiennons emiproceukeres eekt vamkvds, .pret)l< anon.mlprocedure.

[

rs.o _ ,,,,,,s.ac _ s.,,-,_ . _...a u_. ~ m . - . = m < amsxx.1.>>- i

Flaw Sizing Calculations for ISI RPT # 94-0128 For surface and subsurface single planar flaws oriented in plane normal to pressure retaining surface ASME SECT XI 1989 WI NO ADDENDA ~77#I INITIAL TO VERIFY ISl Report # 2hC/2 9 Evaluation Performed By: k Date: //! W Indication # / Reviewed By: ### Date: / 2' /< 7./f 4 p.% -n Lenath Ler.gth of the flaw "L"is detprmined by finding the difference between L1 and L2. ,

L1 and L2 are from page _'I_, of the UT report, t= 90f.3 /f'(L2) </ot .ts(L1) = _f_./2f inches.

51'4.5'15" $ 3 ' 't. W Thickness Thickness of the component from nominal wall value.

This value is from page ._/_ of the UT report.

"t"= _$__. IoS inches Calibration From the calibration report ( DA'T-0//), the calibration was performed on a "T" = T. 60 inch thick block.

Calculations From page I of the UT report the flaw exhibited 50% Peak Amplitude (indication did not reach 50%

DAC) at Y.r5/ and f.9 Y inches of metal path at C.oo and 51sinches from the weld center.

line respectively. A manual plot was made with this information which provided depths for these points as O . 77 and _]_. 47,_ inches from the inner surface.

1) Determine S in inches, S = _d.._'/_f_, inches (as measured for 50% point closest to surface).

2) Deterraine 2a in inches.

2a = _/_. /2 (inches depth at upper 50% pt.)- A. M (inches depth at lower 50% pt.) =

1.'31 inches. ,

Determination of surface or subsurface ("a* and "d* are equivalent) 0.4a = (2a / 2)

• 0.4 = 0 .9/*/

Compare to S (from step 1).

If S is less than 0.4d, the flaw is surface. a = 2d + S = N inches.

If S is greater than or equal to 0.4a the flaw is sub-surfE. a = 2a / 2 = _9_. /I I inches.

~

t = ._/_. /Js (for a/l > 0 5, t = 2a) t =l.lo9 (part "T")

a = _Q_./ f T (surf o@ circle one) S = 1. '/f NOTE: T?iese values were derived without applying beam width correction, fbw-12 rev o

$9 $Q

, . - - -_ . . ~ .- _

. _ ~ . - - . . . . -

a Pl 1 Indicetion Ravinw Rpt # 0128 Iso # - ISI-43A item # - W-F Indication # - 1 New iso # -ISI-43A New item # - W-F Method - UT 60 Procedure - NSP-UT-3 Rev 5 ,

Code - ASME Sect XI '89 with No Addenda Discussion - ,

This indication is being re-evaluated in response to Audit No. 94-19-OUT, Finding 94-4 28 on inappropriate Flaw Analysis for ISI. This action is taken to ensure correctness of the original disposition of this indication and to provide additional OJT for the M&SP personnel in performing flaw evaluations.

The indication was reported as a linear with a length of 1 1/8" and an amplitude of 30%

. DAC. This weld had been previously examined and reported on report #91-0164.

l There were no indications noted as a result of that examination. The requirements for l recording of indications have become more stringent in the edition of the code required j for the third interval. Due to the transition from the cone to the shell on this weld it was

decided to use a beam plot to determine the dimensions of the indication for evaluation.-

Assumptions -

The evaluation that is provided does not take into account the effect of beam spread on J

sizing of indications. If this were factored into the calculations it would reduce the 3

through wall dimension and also increase the "S" distance. Our approach is more i

conservative. ,

Code Requirements -

i ASME Sect XI IWA-2232 refers to Appendix 1 which refers to Sect V Art 4 with supplements. Supplement 10 deals with reporting criteria and requires that " Angle '

1 beam reflectors that produce a response greater than 20% of the reference level shall be investigated. The maximum amplitude, location, and extent of these reflectors shall  ;

j be recorded. The operator shall determine whether the indication originates from a flaw or is a geometric indication in accordance with Supplement 11. When the reflector is determined to be a flaw, the acceptance standards of IWA-3000 apply" l Summary -

The indication noted on this report exhibited an amplitude in excess of 20% of the reference level and requires evaluation to the code acceptance standards.

Prepared By Ov C2 44 lu/ #

Reviewed By -

l i wa.rn. .a i AL 1

, n r/s i

.,?

. ,l.

Prairie Island Unit 1 Report # 94-0128

• Northern States Power Company source Doc-c 1. 10

.I Operations & Maintenance Supt 60* ULTRASONIC EXAMINATION Materials & Special Processes REPORT (3rd 10yr) S/N 1071 Item Item Description ISO

[ System STEAM GENERATOR #11 ISI-43A W-F TRANSITION - SHELL Surface Condition NtYrbb spet,g 533CAe2 Size / Length 175"o Thick /Dia 3,680 Temp 9 0* F BLENDED

/gt2fS, -SA 503Glu2-/ S.*

W R Number ISI Contractor Exam Date Procedure Field Change N/A 9402190 LMT 05/18/94 ISI-UT-3 Rev 5 Beam Angle Temp Gauge S/N Exam Start 0 0941 hours0.0109 days <br />0.261 hours <br />0.00156 weeks <br />3.580505e-4 months <br /> Calibration Exam End G 1200 hours0.0139 days <br />0.333 hours <br />0.00198 weeks <br />4.566e-4 months <br /> Report Nmbr WLT-011 60* (Nominal) NSP-030 Reporting Level Cal Block 26 Ref Sensitivity 58 dB E*.'aluation Level Ref Std IMP-107 Scan Sensitivity 70 dB 20% DAC 20% DAC RESULTS NAD = No Apparent Discontinuities; L = Linear; S = Spot; M = Multiple GEO = Geometry Visual = Non-Section XI Visual Examination Axial Indication Amp Scan Res- Indication Sweep Metal Surf Circ Location Length %DAC Nmbr ults Type Loc'n Path Dist Location 5.0 1-1/8" 30 1 IND L 6.8 5.51 4.77 33' 8" 2 NAD 3 NAD 4 NAD .

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H f LLWTATIONS: 5"x8" WELDED PADS D.S. AT 5' 8',17 3",18' 10" AND 14' 2" REMARKS E.J V C, LEVEL I 5.///d4M / o */ FC VIo48M ^ d b NM ^*8f[ M #.

Rabdr & t'.Y wi I

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SKETCH g ESRSONNEL Examiner:

JJ_,

W ' L T OMAS Level m JL

[W E Examiner:

J.L L$tERS Level

! I I 6 O' 270 Contractor _

90 2.

Review: ~,&pfdA L/2S/ff

) Date

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Reportl 94-0128R1 Northern States Power Company Prairie Island Unit 1 source Doc-c 1, 10 N. 60* ULTRASONIC EXAMINATION

) Operations & Maintenance Supt REPORT (3rd 10yr) S/N 1071 Materials & Special Processes Item Description m

ISO Item System W-F TRANSITION - SHELL STEAM GENERATOR #11 ISI-43A Size / Length Thick /Dia Temp Surface Condition Material 3.680 N/A'F N/A 175"e

% GAC23 ILC2 ->

W R Number ISI Contractor Exam Date Procedure 9402190 LMT 06/08/94 Rev 5 Field Change N/A ISI-UT-3 Beam Angle Temp Gauge S/N Exam Start 0 N/A__ hours Calibration N/A Exam End 0 N/A hours Report Nmbr N/A N /* (Nominal)

N/A Ref Sensitivity N / A _dB Reporting Level Cal Block Scan Sensitivity N/A dB Evaluation Level N/A % DAC Ref Std N/A N/A% DAC S = Spot; M = Multiple RESULTS NAD = No Apparent Discontinuities; L = Linear; Visual = Non-Section XI Visual Examination GEO = Geometry Indication A:tp Circ Axial Res- Indication Sweep Metal Surf Location Length EDAC Scan Loc'n Path Dist Location Nmbr ults Type 1 NAD 2 NAD 3 NAD 4 NAD r

o LlMITATIONS: NONE RElvtARKS: SEE REMARKS ONISI 3RD 10-YEAR REPORT #94-0128 FOR EVALUATION.

PERSONNEL SKETCH Examiner: LeTe~1 N/A Examiner: Level N/A Contractor / / /

Review: / Date

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INDICATION DATA TABULATION SHEET Examination Report # M - o t1.6 FORWARD BACKWARD L1 L L2 IND SCAN  % OF W MAX 50% DAC 50% DAC 50% 50 %

1. # DAC W MP W1 MP W2 MP DAC MAX DAC REMARKS I t 3 0'/- 6.2r S. bot 6. co C.ssi Eas 6.94 a3' 725" 33's" 319.3d L ine n <t

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.JUN-2844 TOE'15:17 ~ ~0 PERIL'MAINTSOPPORT ~~ FAXNO.'8123d7389 RPT # 94- 0128 JND # 1 REV 16/28/94 Pt ANAR FLAWS a/l (ASP ECT) R ATIO s

FOR ALL FLAWS l= 1.13 = LENGTH OF THE FLAW AS DETERMlNED BY FINDING

= - - - -

THE DIFFERENCE BETWEEN L1 AND L2 (50% PTS FOR LENGTH)

FOR SURFACE PENETRATING FLAWS a= 0.00 = DISTANCE BETWEEN THE ID/OD SURFACE OF THE COMPONENT AND

- - - - - - - - - THE POINT OF MAX THROUGH-WALL PROPAGATION OF THE FLAW all= 0.00 = THis IS THE ASPECT RATIO FOR A SURFACE PENETRATING FLAW FOR NON-SURFACE PENETRATING FLAWS S= 0.90 = SEPARATION. DISTANCE BETWEEN THE ID/OD SURFACE AND

-= - -

THE CLOSEST APPROACH OF THE FLAW 2d= 0.21 = THROUGH WALL DIMENSION OF A NON-SURFACE .

PENETRATING FLAW 4

DETERMINATION OF SURFACE vs SUBSURFACE I

. ,. j PRODUCT 0.,04 = DIVIDE 2d BY 2 AND THEN MULTIPLY QUOTIENT BY 0.4 a= N/A = IF 'S* ls LESS THAN PRODUCT ABOVE THEN FLAW IS SURFACE

- ADD 2d TO S a= C '9 n IF 'S'IS GREATER THAN PRODUCT ABOVE THEN FLAW IS

---

4 -

SUB-SURFACE - (2a = 2d) DIVIDE 2a BY 2 a/l= /. 39 = THIS IS THE ASPECT RATIO FOR A SUB-SURFACE FLAW alt R ATIO THE ASPECT RATIO IS APPLIED TO THE APPROPRIATE SECT XITABLE AND THE ALLOWADLE a/t PERCENTAGE IS DETERMINED FOR THE SUBJECT FLAW t= 3.68 = NOMINAL (OR ACTUAL) THICKNESS OF THE COMPONENT a= 0.10 = EFFECTIVE THROUGH-WALL DIMENSION AS DETERMINED FOR THE TYPE OF FLAW ABOVE a/t%= 2.72 = DIVIDE EFFECTIVE THROUGH-WALL DIMENSION (a) BY THE NOMINAL (OR ACTUAL) THICKNESS OF THE COMPONENT 2.815 , c/t% ALLOWED BY USE OF UNEAR INTERPOLATION ffk ' 9_ Wfm-9to AS"y/6/29/W .

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, i, Northern States Power Company Ultrasonic Calibration Calibration Operations & Maintenance Support Report Number WLT-011 Materials & Special Processes Date: 05/18/94

~

Procedure ISI Contractor in s ISI-UT-3 Rev 5 Field Change N/A LMT ,

~

Calibration Block Serial Number 26 Type BASIC Check @ N/A hrs Material: C/S Size 6" Thickness 3.50 Check @ N/A hrs Temperature 65'F Entry Surface N/A Final Ch k @ 630 Reference Block Serial Number LMT-107 Type ROMPAS Couplant Batch Number Temperature 65'F 093014 Ultrasonic instrument Manufacturer PANAMETRICS Model EPOCH 2100 Serial Number 91042006 Recalibration Due 7/13/94 Search Units S/N Angle Freq Wave Mode Mfr Size Index-Nose Wedge Mfr RS239 60 2.25 . SHEAR HARISONIC 1"x.5" N/A HARISONIC N/A N/A N/A N/A N/A N/A /NA N/A Refracted Anglein: SU#1 SU#2 Search Unit Cable Temperature Calibration Block 58 N/A Type RG-174 Gauge S/N .

Reference Standard 58 N/A Length 24' NSP-030 Connectors 1 AMPLITUDE LINEARITY (Signal 2 shall equal 50% of Signal 1, iS% F.S.H.)

Signal 1 (Set) 100 90 80 70 60 50 40 30 20 10 Signal 2 (Read) 50 45 40 35 30 25 20 15 10 5 AMPLITUDE CONTROL ACCURACY Amplitude Setting, % F.S.H./db Change 80/-6 80/-12 40/+6 20 / +12 Acceptable Range, % F.S.H. 32 to 48 16 to 24 64 to 96 644o 96 Actual, % F.S.H. 40 20 80 80 Status Display Reject 0%

Gain / Sensitivity 49.0 dB Sweep .824 in/div Delay 0.00 in Zero 15.300 sec Filter 2.25 Mhz Damping 1500 Gate Start 0.886 in Energy HIGH Gate Width 8.085 in FULL WAVE (Detector)

Gate Level 20.0 % P/E Mode Velocity .1268 in/ sec 60.0 (Angle) / 3.50 in (Thick)

Beam Spread. (UT-3, UT-3A, only) YES Signal to Noise Ratio (UT-16 only) N/A REMARKS: NONE PERSONNEL REVIEW Examiner d^ Y Contractor W.L.T v1 Level Review 4/ A/ M f d/ 9._t'

/_

> Examiner (  %

E.J. 6 VLIC Level NSP i

,I /2/. /k Examiner hth kgu IC. Review

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J.L.MVERS Leve!  ;

i Examiner ANil i N!A Level Review /; ) /w b/O/f I UTWLT011. DOC Revision 5/94 Page 1 of ___ _

j i

1 Northern States Power Company Ultrasonic Calibration Report Calibration  ;

Operations & Maintenance Support DAC Curve Report ,

Materials & Special Processes Number WLT-011 l

l l l l l l I I I I I I I I I I I I I I I I I 90 l l S l l 1 l l l l l l l l 1 I I I I I I i l l l l I G l  ; l N l [ gl 1 I l l l l l l A l l l l l l l l I ] l 4

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I I J 0 1 2 3 4 5 6 7 8 9 10 SWEEP Reflector Number 1 2 3 4 5 6 7 Identification 1/4T 1/2T 3/4T 5/4T PLANAR '40MPAS

. N/A SDH l

Amplitude (% fsh) 80 50 32 18 12 45 N/A Sweep 2.0 4.0 6.0 10.0 8.0 1.8 N/A  ;

4 Metal Path 1.688 3.297 4.985 8.338 6.594 1.483 N/A i

i Surface Distance 1.460 2.852 4.312 7.212 5.704 1.283 N/A l j i l

uTwtToti ooc nevision s/94 eano 2 or 4

l Northern States Power Company Ultrasonic Calibration Report Calibration  !

Operations & Maintenance Support Beam Spread Report Materials & Special Processes Number WLT-011 j l

Beam Spread Data Surface Distance, Range, Metal Path, at:

Reflector Leading (50% Maximum) Maximum Amplitude \ Trailing (50% Maximum)

Surf Sweep M. P. Surf Sweep M. P. Surf Sweep M. P. I T/4 1.092 2.3 1.957 1.460 2.0 1.688 1.208 1.7 1.396 2T/4 3.249 4.4 3.757 2.852 4.0 3.297 2.553 3.7 2.952 3T/4 4.630 6.5 5.353 4.312 6.0 4.958 3.798 5.5 4.576 PLANAR 6.002 8.5 7.008 5.704 8.0 6.594 5.272 7.4 6.095 ST/4 N/A N/A N/A N/A N/A N/A N/A N/A N/A Near / Far Surface Resolution Data Near Surface (Rompas Block) Amp Sweep M.P.

"Near" Side-Drilled-Hole (~0.3" depth) N/A N/A N/A "Far" Side-Drilled-Hole (~0.7" depth) N/A N/A N/A Straight Beam Far Surface (Calibration Block) Amp Sweep M.P.

Notch N/A N/A N/A Back Reflection N/A N/A N/A Angle Bearn Far Surface (Calibration Block) Amp Sweep M.P.

Clad Interface Side Drilled Hole N/A N/A N/A Estimate of Near Surface Resolution: N/A inches below front (entry) surface Estimate of Far Surface Resolution: N/A inches below front (entry) surface UTWtiot 1 DOC Revision 5/94 Page 3 of

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- - - - - - - - - . . - - - . - _ 1

GENERAL COMPUTATION SHEET I BP M Northern States Power Company enosecr u7 &8A

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1. 22 Steam Generator Flaw Evaluation for ISI Report 89-364 Prairie Island Unit 2 January 31,1995

t PI 2 Indication Rnview Rpt # 364 iso # 1S1-37 Item # - W-A (12' to 22' 3") Indication # - 1 through 4 New Iso # 1S1-378 New Item # - W-A Method - UT 60 Procedure - NSP-UT-3 Rev 4 w/FC-1 Code - ASME Sect XI '80 through Winter '81 Discussion -

These indications are being re-evaluated in response to Audit No. 94-19-OUT, Finding 94-28 on inappropriate Flaw Analysis for ISI. This action is taken to ensure correctness of the original disposition of this indication and to provide additional OJT for the M&SP personnel in performing flaw evaluations.

The three indications were reported as " Linear". The maximum amplitudes for these indications were 40%,20%,45% and 40% of DAC respectively. The depth of these was approximately 28%,31%,43% and 28% respectively from the O. D. ,

Assumptions -

None Code Requirements -

ASME Sect XI IWA-2232 (a) references ASME Sect V Article 4 for conduct of the examination. Paragraph T-441.8 (a) states " Record all reflectors that produce a response equal to or greater than 50% of the distance-amplitude correction (DAC)" and '

" Record surface reflectors that produce a response equal to or exceeding the calibration amplitude established per T-432.3.1 (d)". The last is a reference to the amplitude of the notch in the far surface of the calibration block.

Summary -

The indications (1 through 4) noted on report #89-364 are not surface related and therefore the requirements for recording in relation to the DAC apply. These indications are acceptable and require no further evaluation.

Calculations - From calibration report KJL-001 the ID notch is at 8.3 screen divisions and 11.33" metal path with a measured angle of 61 deg in the cal block.

Ind #1 - cos 61 deg = 0.4848 0.4848

• 3.02" MP = 1.4641" depth from outer surface 1.4641" / 5.312" = 0.2756 or 27,56% depth Ind #2 - cos 61 deg = 0.4848 0.4848

• 3.36" MP = 1.6289" depth from outer surface 1.6289" / 5.312" = 0.3066 or 30.66% depth Ind #3 - cos 61 deg = 0.4848 0.4848

• 4.67" MP = 2.2640" depth from outer surface 2.2640" / 5.312" = 0.4262 or 42.62% depth 1 of 2 j

PI 2 Indicetion Revi>4w Ind #4 - cos 61 deg = 0.4848 0.4848

• 3.02" MP = 1.4641" depth from outer surface 1.4641" / 5.312" = 0.2756 or 27.56% depth Prepared By Vd% C##4v/f Reviewed By .

n/sy'u O

l 2 of 2 l

1

t f a 1 ISI Flaw Disposition WOrksheet; f 1. ISI Report Number 2. Flaw Nurrger 3. Item Number 19 Total Number of Pages j tYr-Wl C. G }.W l 7-('t 7 , TI 4.151 Interval O OK Reviewer I .

/ 5. Code Edition and Addenda (5 OK Reviewer 4+

IRsecond interval r intirval Opqservice O ',J W81 O 86 no addenda O 89 no addeida Tl other _A/ M O tht'd

% Acceptance Standard (5 OK Revi er # t_.

O IWB45' OfNB-3511 O IWB-3512 O IWB4514 O IWB-3515 O IWB-3516 O IWB4518 k[ /

/ O IWB-35 O IWC 35 0 O IWB 3523 0 IWC-3511 O IWC-3512 O IWC 3513 O IWC4514 O IWC 3515

7. Calculations E OK Reviewer g Istn; ATI/khc4 .D5 fn.o f 2g wijlicah Ji- 0. 7%Z, , e:

r c>. 2XI i 6t>,i s 5~3 /Z- , 32 c.ec? ?

I

[b % ATMchcM Fib' f wf1' M ee cWh FM ty/t = kb rk

,$. o,2Jos o, g,yc fu,Q +, o,go A o :1'to L cr e ca. '27o I m , f. M ??. /bf24 % /.o >o 7g, c.m

$W oN jx0 s'Q &.9 __f Q gfI.IeJ bovt, (. Scc NT(Wheb ,

/

k ok j. = :gr1 - I6eo Aw/ rale rey / ire' .

t

?.o % vva,t.

79 , o.f li wr9:A

/

3. Resus l'1 OK Reviewer M all = c> S 0 calculated c/t %= '/ o %

Code allowab' : c/t %= . A/M f A/A laminar flaw suyface area: (0.75 ' t + w) =

9. Tabic used for analysis M OK Reviewer-Em O IWB-35101 U IWB4510-2 O IWB4510-3 O IWB-35111 O IWB45112 O IWB45121 O IWB4512-2 O IWB45141 O IWB4514 2 O IWB-35144 O IWB4514-4 O IWB-3514 6 O IWB45151 O IWB-3516-1 O IWB4516-2 O IWB4518 O IWB4518 2 O IWC4510-1 O IWC4510-2 O IWC-35104 O IWC4511 O IWg45112 O IWC 3512 2 O IWC-35131 / //

10. Was linear interpolation used? O yes hl no if no,why? Macc it.'W ,

11. Was IWA 3200 Significant Digits For Lt.miting Values foil en JRyes O .o OK Review If n< , why?

12.The correct Code Edition and Addenda was available an sed -F1-yes Pre trerM OK Ileviewer JL. N dY '/

13. Statement of acceptability or rejectability with basis (E OK Reviewer 1(,

v; p Accept. O (a/OCode allowable 2(0/Ocalculated O Reject. O (o/OCode allowabig < (0/Ocalculated W OEM flaw eyaludi//n handbook (see attached analysis)

15. Prepared by and date 6.Ern 'e ing <iew by and date 17. Approved by and date gef [c (')f.o$. 7I A

,y (. ,T1us

,_ .approuel awares that all .unulved

s. -.noth thisflaw sising ad s ~ndisrue acconkmre

.. . . re.l. a. - t -l . , . .,. .e..

ik newit< are corree t anlshe methahdogy owJ h in arewekeer wh j muh applicabin codes, skandards, ypret)htwiores and protea.%rre menienkangy we correct emiin accankmre wh oppskable taitt staamkvds. spect,4canora emiprescrahnest etylocehle esArt skunhardt <pren)learimu estpence.Aners l NSP O \i3NGAl5N51FD%R0 DOC iSI Flaw Duroution w.whheet Revesion 0 REVISION 14%94 l

LEGEND 20 yrs.

7/9KQ/ FM (og /e//gf6 (p@}/f), A - The 10, 20, 30 year acceptable flaw limits.

j--30 yrs. B - Within this zone, the r A 20 q;.. q

i. .

9 . .

surface flaw is acceptable

.f j .

by ASME Code analytical IO criteria in IWB-3600

f p 1 3

/IM~ T C - ASME Code a!!owable since IO lj KEEGdy '

]fi[ Mi 1983 Winter Addendum I hh  :-

f D - ASME Code allowable prior U LII!hMh5 to 1983 Winter Addendum

'B 12 b _a 5 '

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• 89-36V,<rw 5

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• 0 0.040.080.120.16 0.2 0.240.280.320.36 0.4 0.44 0.48 FLAW SHAPE (a/f)

Figure A-2.2 Flaw Evaluation Chart for the Tubesheet Channel Head Junction for Prairie Island Units 1 and 2 X Inside Surface X Surface Flaw 1 Longitudinal Flaw Outside Surface Embedded Flaw X Circumferential Flaw pr 5elecan viis ume, th*M oh Wett@ lode, oN et s).9Y 1299w.wpf:lb/090294 A2-5 4

c 1

l ISI Flaw Disposition Worksheet j l. ISI Report Number 2. Flaw Number 3, item Number 14. Total Number of Pages en 2. 9p %4 5' Ti z Mo i TISI interval Df.OK Reviewer N 5 Cpde t;dition and Addenda Od OK Reviewer ah d second interval O third interval O preservice r 80 W81 0 86 no addenda O 89 no adhnda O other

' 4 Acceptance $tandard MOK Reviewer .N-O IWib3510 $IIWD3511 O IWD 3512 O IWB-3514 O IWD 3515 O IWD-3516 O IWD 3518 O IWD-3522 O IWD 3523 J

, O IWC-3510 O IWC 35tl O IWC-3512 O IWC 3513 O IWC-3514 O IWC-3515

7. Calculations FLOK Heviewer TL

% ATraceev Ts4 F M s n % h r e )= 00 4o2- <<= 0. m l

% = N 2- 9 o. a27 ,

F W 74 6 Sunr4ce tw,tt.

p.,. O'M Oaw-I _ g g g , 9 g,p sm-zlu o u.e. -se w w

' s' & - s>s cu 2. - su s<st. w wp p s*.*3ltwL s O.oM7 lb w 74 A = d,oa7 *J y -: *E ,, O JPI 1%m *tRLe T.wE ~ 7fIl ~l

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• Ye%,

1 coe__

Q,f* &

• h o3 5oh Yb wm 95 Les tw Yhuwe

- - - ~ ~~

C. Results /t,0K Reviewerdk c/t = C *fD l

calculated o/t %= ~2 0 Code allowable o/t %= N laminar flaw surface area:- (0.75

• I + w) = PA- )

9. Table used for analysis %COK ReviewerWor_. '

l 0 IWD-3510-1 ~ O IWD 3510 2 O IWB-3510.3 MIWD 35111 O IWD 3511-2 O IWD 35121 O IWD-3512 2 O IWD-35141 O IWD 3514 2 O IWD-3514 3 O IWD 3514-4 O IWD-3514-6 O IWD 35151 O IWD-3516-1 O IWD 3516-2 O IWD-3518-1 O IWD 3518-2 O IWC 35101 O IWC-3510-2 O IWC-3510-3 O IWC 35tl 1 O IWC-35112 O IWC-3512 2 O IWC-35131

10. Was imcar mterpolation used? O yes Mno if no, why? h e(ft%M-N l l

11. Was IWA-3200 significant Digits For Limiting Values followed? Kyes O no 14 0 Reviewer :2'//ow ifno,why?

12.The arrect Code Edition and Addenda was available and used. 21yes Preparer __ -

p(OK Reviewer M4<-

13. Statement of acceptability or rejectability with basis lld OK Reviewer r2&L, d Acce t. O (o/0 code allowable 2 (o/0 calculated J!n Rei et, (a/OCode allowable < (o/Ocalculated

, p/ O OEM flaw evaluation handbook (see attached analysis) 1 Prepard i f and date 16. Engmcering reviCw by and date 17. Approved by and date

} -

b b. M The.s mywsnud auures thus dl howhsJ wem sfaw st;*ng samtfew TM renew au,we.s skt ne re eseks are rewrect omJ nha methnaden ansgnunune were autre of the neceuory shot the reeks eulthe reenfu e..crect ont the methema49 mwJ t, m <mc,w.amme .,rh mwd A,in acc*rdane weA gyilnah/r ceet ammawa, madr=&4 pre sterres eslm a.vordes, wnh apphcohk (saka prunhar s A L I snmekuds poconsenn edpeweshwes ,rwcAmkms onalprox eewes skankrrJs gecillemkum enspe,arabwe, V

l MU!Il O MSrJGNsNsMJu lt0 DOC 151 Fl4w thresdam Work 31seet Revssw 0 R EVISION10 26-94 l

4_ , _ . . ._ _ _. . . _ . . _ _ _ _ . . . _

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M{468}$dMintMME AN M44fISLFlawShinkWoirksheetWWEaa62/ARBUgang#m#gg '

2. Flaw Number 3. Item Number

' DSIReportNumber na 19 - w. / s- E 2. V o l~4.15) Interval El OK Reviewer # 5. Code Edition and Addenda .ROK Reviewer . xot-- 6. Method DK,UT Q RT

• - k2nd Interval O 3rd interval O preservice ' K80 W81 0 36 no addenda O 89 no addenda O other O FT O MT L i aw s ch fiTOK Reviewer 9C g j ss

-[

i V I O.51m"l , so2 *f" t t

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---> /.5 84--

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1 Side We~w 1

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l 8Ym. $ I I ,

e 8.Calculauons ISOK Revicwer C Show determination of surface or subsurface

-6&L a. t l

! Show determination of type of'a* to use l I

4

$4d o. t l

9. ISt.FE 1 Paragraph - "Rounding.Off Method" was used. 4 Lyes Preparer W plOKReviewer C j 10. Code Flaw Dimensions .!(OK Reviewer w "i " m p, 'f102 "a" m 0, 3 ffc/ "fm" m $, 3/) "f,,,,,,,g" a Af/4 "$" a p,00pf "w" m ff/k

!!. Flaw Type fEOK I viewer C

%urface Planar _ T) O Subsurface Planar (IJT/RT) O Laminar (trr/RT) O Linear (PT/MT/RT)

13. Flaw Characterization Figure !2 0K Reviewer ULT

% 1WA-3310-1 O IWA-3330-1 O IWA-3350-1 O IWA-3380-1 O IWA-3400-1 O IWA-33201 O IWA 3340-1 O IWA-3360-1 O IWA 3390-1 -

a 13. Flaw Characterization Figure Number O Flaw I O Fla.w 2 'KFlaw 3 O Flaw 4 O Flaw 5 I' J 14. Was IWA-3300 Flaw Characterization followed? )(yes O no if no, why?

, 15. The correct Code Edition and Addenda was available and used. hes Preparer hgTplOK Reviewer g

16. Prepared by and date gjg j 17. Review by and date

$g /f, y% ..,

rhd 90.9>ht ere terrett omlh se0% nste$it he Ottotekstatt eenth t>ppilteble GaultR Blenkardt, Wg Neitw assnets lhet the NJWh2 art ternti must the netthemiuley notelit $4 ottersksenct Mih WYG spetyenoloss eratproteernu, telts. simukraft spet}casteesontpractaont

[ N_se o usrucmrvsmswnenoc ist m, see w o,wi,o a.+ . o . - . 's , ~x 4 n leP3 i ' ,pevistort tW54 ]

i

1 Flaw Sizing Calculttiens Using Metal Path for Fe Vessels 2 2" For surface and subsurface single planar flaws oriented in plane normal to pressure retaining surface

.ASME SECT XI 1980 WI ADDENDA THRU WINTER '81%l INITIAL TO VERIFY ISI Report # '87'3/o Evaluation Performe<LSy: Y6M M Date: / f-Flaw # S- Reviewed By: ##' Date: ///n/r'/

~

///is/ %

Lenoth Length of the flaw T is dete lined by finding the difference between L1 and L2, L1 and L2 are from page of the UT report. (4 m A / p m 'b'o 4 ~5 .9 M#4IU ^"# "(-

t= / .4STf(L2) /_7/2T (L1) = O.Ms inches, b u e 9 o n.i 4may bug deder,$

Thickness Thickness of the component at the location of the flaw, using UT o circle one).

This value is from page /_. of the UT report.

"t" = 5~. 's/2 inches (used in step 3 and step 6)

Calibration From the calibration report ( Wl), the calibration was performed on a "T" = ._5_'. 5YO inch thick block.

The ID notch was set at _]/_.3.3 inches metal path (used in ste Calculations usina metal path From page _ff of the UT report the flaw exhibited 50% DAC at fl . /oo and _]R. 6 inches MP. -

(Use of 50% DAC instead of 50% max amp for indications over 100% DAC is more conservative).

1) Determine the calibration block to part thickness ratio.

1.S'5'O (calibration block thickness) /1.3/2- (part thickness) = / . Ob

2) Determine the thickness of the part in metal path.

// .3 3 (ID notch metal path) /_/_.OWK(from step 1) = /f.$'N1tnches MP.

3) Determine inches of metal path tcr equivalent inches of depth

]2. 9N1(part "t" in MP) /1 311. (part T in inches) = 1.0 Y/ finches of MP per inch of depth Low er bf.'r ** u ..

h4) Determine the.upperdepth of the flaw from the exam surface,

./Q,. M (metal path at 50% upper) /I. C'//f(from step 3) = ,,j .Tl'/7 inches depth. - S. 312 3064 pf 5) Determine theMkepth of the flaw from the exam surface. 48

/ /5'(from step 3) = f.M A/ inches depth. - f, 7/> "

• d 370

.j).. /oD (metal path at 50% lower) /1.d4

6) Determine S by picking the smaller of the following; Low a S = 6 .CM1 (result of 4) = distance between exam surface and the.upperflaw tip i

>>OR<<

S = 11/2. (part "t") _d..TIo/ (result of 5) = d. fY/7 distance between the side opposite exam surface and the lower flaw tip

" If"

7) Determine 2d in though wall thickness.

.p__.370/ (from step 5) _f)1..on27(from step 4) = ,C_.3IoTIinches.

Determination of surface or ?, a urface 0.4d = (2d / 2)

• 0.4 = _Q_.07M Compare to S (from step 6)

If S is less than 0.4d, the flaw is surf ace. a = 2d.+ S = d 370/ inches.

~

If S is greater than or equal to 0.4a the flaw is sub-surface a = 2a / 2 = _f///l inches.

I = _d__.NOA (for ah > 0.5 t = __{_ .3/2 (part thickness) a = O_,.3'/:5/ hr sub sDf}rcle one) S= 0. CO.2 '[

hwept Rev o , q ,., j ,,g g y d e Al Od 'k c., 6 d. ev aJ !G

..i. ., .. ~tL - w(3

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- PI 2 indicetion Revinw Rpt # 364 iso # 1S1-37 Item # - W-A (12' to 22' 3") Indication # - 5 & 6 New Iso # ISI-37B New item # - W-A Method - UT 60 Procedure - NSP-UT-3 Rev 4 w/FC-1 Code - ASME Sect XI '80 through Winter '81 Discussion -

These indications are being re-evaluated in response to Audit No. 94-19-OUT, Finding 94-28 on inappropriate Flaw Analysis for ISl. This action is taken to ensure correctness of the original disposition of this indication and to provide additional OJT for the M&SP personnel in performing flaw evaluations.

The indications were reported as " Linear". The maximum amplitudes for these indications were 75% and 75% of DAC respectively. In performing the evaluation it was noted that for indication #5 the movement of the indication on the baseline between 50% points was less than 2/3 the movement noted for the 2% notch during th'e calibration. Using the notch comparison would reduce the flaw through wall dimension (which was determined by calculations based on recorded metal path for the 50%

points) by a factor of more than four.

Assumptions -

None Code Requirements -

ASME Sect XI IWA-2232 (a) references ASME Sect V Article 4 for conduct of the examination. Paragraph T-441.8 (a) states " Record all reflectors that produce a response equal to or greater than 50% of the distance-amplitude correction (DAC)" and

" Record surface reflectors that produce a response equal to or exceeding the calibration amplitude established per T-432.3.1 (d)". The last is a reference to the amplitude of the notch in the far surface of the calibration block.

~ s.ft

Lg Flaw Disposition Worksheet

1. ISI Re rt Number 2. I taw Number 3. Item Number 14. Total Num r of Pages

~2.,  % 3[,L/ !o O

4. Ist interval blOK ReviewcW#o 5. Code Edition and Addenda IN OK Reviewerg/m

$second interval O third interval O preservice M 80 W81 0 86 no addenda O 89 no addenda O other

6. Acceptance Standard isOK Reviewerp D IWB-3510 CWB 3511 O IWB 3512 O IWD 3514 O IWB 3515 O IWB-3516 O IWB-3518 O IWB 3522 O IWB 3523 O IWC-3510 0 IWC-2511 O IWC-3512 O IWC-3513 O IWC-3514 O IWC-3515

7. Calculations DIOK Reviewer g4.,

• *= "

Nok kir4ct/60 Esr FvW mWr **8C 03tL

+g 5- p.C%l A ha ta v. 7o F4N 7 W = 50d SVai:;tec PtANM

- 0W2 o. f a c f A 't. W (i.R. 4x t.

$ C.s' - 4o Ics;- WE> ymop S f}~ .ros et t. - 50 ksc kM twh

2. . d'2 f d [tw h 7. 9 %

C g ~'- [O- .3l*L

1. • 3.G *

[O

[= nom Tr$c C T.wQ -3 $^ll - ( 4=h. O ISl?

R .1.ao R_ h_t .

0.30 N=

C4 -.d-0 #

B{ 0 05DtNMW Co92 ALLwwC Thzersze h%hd c5 AcceeN@ W/ cow = hteca uc, G. Results IS OK Reviewer p7/Q_e ,,,,,,, ,

g/( = Ma b calculated c/f %= Z ."I [

Code allowable a/t %=  %

laminar Haw surface area: (0.75 + t

• w) = W

9. Table used for analysis INOK Reviewer _g_g O IWB 35to1 O IWB 3510-2 O IV'B-3510-3 MWB-3511 1 O IWB-35112 O IW B-M 12-1 O IWB 3512 2 O IWB-35141 O IWB.3514 2 O IWB 3514-3 O IWB 3514-4 O IWB-3514 6 O IWB-3515-1 O IWD-3516-1 O IWB-3516-2 O IWB 35181 O IWB 3518-2 O IWC-35to-1 O IWC-3510-2 O IWC-3510-3 O IWC-3511-1 O IWC 3511-2 O IWC-3512-2 O IWC-35131

10. Was imear interpolation used? O yes K no if no, why? D1 ovenw(T /

11. Was IWA-3200 Significant Digits For Limiting Values followed? Myes O no 10 0 Reviewer go-- If no, why?

12. The correct Code Edition and Addenda was available and used. lit 7es Preparer pOK Reviewerge -

13. Statement of acceptabihty or rejectability with basis )$ OK Reviewer g/h_, '

{)fAccppt. (a/OCode allowable 2 (c/Ocalculated act. O (a/OCode allowable < (a/Ocalculated g OIke)' O OEM flaw evaluation handbook (see attached analysis) i Prepare i , and date 16. Engineermg review by and date 17. Approved by and date k && }g cx,, c'. Z S 9)~

rh.s .w.-s ,,ns,.,u-a.ed , s/ . ., .nin.

iks revww asmers shot Ihr resalt.s are corred and the northen 4Jogy Jrpssertem were oeure of rhe me om t}nn the resuhs real the f

the urh a crus vct earl the methrnh% aordas m aww&oen t wrth swJss m natsvakmco enh argdkohk esuk.s, sandwdt archenb>lngy ere sorted eeniin arsstamce wrah escroikable etnits, (ygd ah,e . A s. stare &vds unre.tkorums arntpesn e,herre aperrtkennsun eveltw.ne. hares skunkvds sgwerficnterwu anspr.ardures l imni o uSNGrnNSIFDWR0 LXK? 151 Flew Despeisitiswa Wochheet Revieron 0 REVISION 10.MM l

kil$ h E$N!$@sIDS$ ' l 3, o' '<

@,.$eb N d.5',

1 l

Side View I e f

I hm. Ye ' '

l I .

t 8, Calculations NOK Reviewer 47-Show determination of surface or subsurface See dkde0 Show determination of type of"a* to use see ~ <D

9. ISI-FE 1 Paragrap - "Rounding.Off Method"was used. Us Prepare % }&OKReviewer C

10. Code Flaw Dimensions paOK Reviewer #

"g " a p, f "O"=lll$~l$' "[ m "=$~N} "$meanced" =

o fh "$" = 0. S$Y "W"= h!/

!!. Flaw Type .ETUK Reviewer W D Surface Planar (UT/RT) $Qubsurface PlanarhT) O Laminar (UT/RD O Linear (PT/MT/RT)

12. Flaw Characterization Figure EOK Reviewer -#

0 IWA 3310-1 O IWA-3330-1 O IWA 3350-1 O IWA-3380-1 O IWA-34001 l NWA.3320-1 O IWA 3340-1 O IWA 33601 O IWA-3390-1 -

13. Flaw Characterization Figure Number 'llflaw 1 O Flaw 2 O Flaw 3 O Flaw 4 O Flaw 5

14. Was (WA-3300 Flaw Characterization feilowed? flyes O no if no, why? ,

15.The correct Code Edition and Addenda was available and used. 3/Ms Prepare % L. )d OK Reviewer _f

16. Prepared by and date 17. Review by and date f h,/$ f n

Yan .. . .a ,a.

a

.-.o. .. . .

nhH '

.a..a,. .- .-- n.

m 2 .s

. .-.. n, ,, ,, . s . , . n .nu. -,a +n

.nprerfica,.eu enalpr.se.h,r.n coJes, sembvds, rp.cajiceil.nu arutpree.Jove.

jy/d3 iMVISIONIN W l I

[ NSP o usNGN5N33'swRODOC ismaw si*g wmuh.e. Revhiu 0 r "< w. . . > -

6 4

1 l

Flaw Sizing Calculations Using Metal Path for Fo Vessels 2 2" For surface and subsurface single planar flaws oriented in plane normal to pressure retaining surface ASME SECT XI1980 WI ADDENDA THRU WINTER '8% ! INITIAL TO VERIFY ]

ISI Report # T9'N Evaluation Performed By: M M Date: /I Flaw # I'd Reviewed By: MV4 Date: s2 h,/(v l s w ..au ' i l Lenath )

Length of the flaw "I" is determined by finding the difference between L1 and L2. ' ' ' g ' P , ,-/,.s ue L1 and L2 are from page Iof the UT report. La-#4 / W h"d #58' t = _d .%6 (L2) .f 36 (L1) = A. 6 (inches. dd c d *M h'5 O ' ^# [j [j Thickness Thickness of the component at the location of the flaw, using UT circle one).

This value is from page / of the UT report.

"t" = X. '5/ 2 inches (used in step 3 and step 6)

Calibration From the calibration report *00/ h the calibration was performed on a "T" = _f_. 60 inch thick block. y The ID notch was set at 2_3.3 inches metal path (used in stepM Calculations usina metal path From pagelof the UT report the flaw exhibited 50% DAC at 9. . N and i . / 3 Inches MP. ~

(Use of 50% DAC instead of 50% max amp for indications over 100% DAC is more conservative).

1) Determine the calibration block to part thickness ratio.

f.TTO (calibration block thickness) /[. 3/.2 (part thickness) =_/_.O N

2) Determine the thickness of the part in megtath.

I. 3 3 (ID notch metal path) / _f_.dYy1 (from step 1) = ,/.2. 'Eb2 inches MP.

3) Determipp inches of metal patgfor equivalent inches of depth

./_C. '89'f2(part "t* in MP) / 5 .7/1 (part "t* in inches) = 1. /Iinches of MP per inch of depth

4) D termine the upper depth of the flaw from the exam surface.

. / 3 (metal path at 50% upper) / _8._.oN(from step 3) = .'/722, inches depth.

5) D termine the lower depth of the flaw from the exam surface.

. 76 (metal path at 50% lower) /.5.. W/Sifrom s'.ep 3) = d.1757 inches depth.

6) Determin S by picking the smaller of the following; S = _Q. 71X(result of 4) = distance between exam surface and the upper flaw tip

>> OR <<

S = ,_f.M,(part "t")-1. f6f(result of 5) = O_.fi%/ distance between the side opposite exam surface and the !ower flaw tip

7) Dejermine 2d in though wall t)1ickness.

_Y . 77d (from step 5) - 1/ . // 722(from step 4) = A_30Tfinches.

Determination of surface or subsurface 0.4d = (2d / 2)

• 0.4 = 2.d4 Compare to S (from step 6) j if S is less than 0.4d, the flaw is surface. a = 2d + S = n inches.

If S is greater than or equal to 0.4a the flaw is sub-surface. a = 2a / 2 = _@ ./6/ Ninches.

t=__O_.I (for all > 0.5, ! = 2a) f (part thickness) t = __.92 a = C ./Of(surf q[ nib surL_.Dc ele one) S = ,2_.,6_3f./

flaw mpt Rev 0

[ $0

Pl 2 indicatinn Rnvisw 1

Rpt # 364 lso # 1S1-37 Item # - W-A (12' to 22' 3") Indication # - 5 & 6 New Iso # 1S1-37B New item # - W-A Method - UT 60 Procedure - NSP-UT-3 Rev 4 w/FC-1 Code - ASME Sect XI '80 through Winter '81 Discussion -

These indications are being re-evaluated in response to Audit No. 94-19-OUT, Finding 94-28 on inappropriate Flaw Analysis for ISI. This action is taken to ensure correctness of the original disposition of this indication and to provide additional OJT for the M&SP personnel in performing flaw evaluations.

The indications were reported as " Linear". The maximum amplitudes for these indications were 75% and 75% of DAC respectively. In performing the evaluation it j was noted that for indication #5 the movement of the indication on the baseline between 50% points was less than 2/3 the movement noted for the 2% notch during th'e calibration. Using the notch comparison would reduce the flaw through wall dimension (which was determined by calculations based on recorded metal path for the 50%

points) by a factor of more than four.

Assumptions -

None Code Requirements - -

ASME Sect XI IWA-2232 (a) references ASME Sect V Article 4 for conduct bf the examination. Paragraph T-441.8 (a) states " Record all reflectors that produce a response equal to or greater than 50% of the distance-amplitude correction (DAC)" and

" Record surface reflectors that produce a response equal to or exceeding the calibration amplitude , established per T-432.3.1 (d)". The last is a reference to the amplitude of the notch in the far surface of the calibration block.

GENERAL COMPUTATION SHEET

- ,, - ., SP /// Aorthern States Power Company ENO.

PROJECT SHEET NO OF SUBJECT On, P. M C'K'D BY sD< r e%  % ,

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NORTHERN STATES POWER COMPANY REPORT Power Production Department NUMBER: 89-364 '

, u ULTRASONIC EXT! NATION REPORT' System ISO Item Ident Calib'n Reoort f STEAM GENERATOR 22 2-ISI-37 W-A 12'-22'3" Number: KJL--001

( Material

--SA 5330D02 Size Thickness 5.312 Exam From:00 Surf Type UNCLAD Plant: PI UNIT II l'

Procedure # / Rev Beam Anale Surface Temp Exam NSP-UT-3

/cc/ 4 60 deg(Nom) 84 *F Company: LHT, Inc.

Evaluation Level Reporting Level Exam Start Time WR 20 % DAC 20 % DAC 1100 Number: N1610-RC-Q Cal Standard Ref Standard Exam Finish Time Exam '

25A 404 1218 Date: 04/12/89 Description of Results at Reference Level: GE0 - Geometry; IND = Indication L = Linear: M - Multiple: S - Soot: NA0 - No Aonarent Discontinuities.

Scan Res- Indication Sweep Metal "A" Max location Indication -

nmbr ults Tvoe loc'n Path Dist Amo Circ. Axial lenath 1 NAD 2 NAD b ~3~~~h

- ~4 IND L'NEAR^

6 i~

~ ~~ - ~ ~ ~ '

~

ik -'

33 4.67 145 ~ ' 13 ' - 2 . 9 "" ~~ ". 5 " -~f -

-4 ~IND L'NEAR~ ~'~~ ~~ 2 l 2_ 3'.02 2 10.. 9'540~ ' ' 14 ~ ~ ~ ~ ~ - - ~" 5 /8 " ' '/ 1.

< 4 ..IND . LINEAR 8 .1_ .11.3 10 75 17' T 5"~-~'~ ,375" 5 - N c _a__IND_ LINEAR..._. 6.9. 9.54T 1.07 7 5.'. ~18 ;'l_.. . _ _~ 3 i _-~ _ _. .5"_ ~6 Limitations: 2"x2" pads upstrm, 9" 0 21' 8", 19' 8", 12' 6", 14' 6", 16' 4, 18' 9". Pads at 14' 3" from weld centerline upstream and dnstream side scan ar'ea due to insulation rina.

Remarks: INDICATIONS RECORDED ARE EVALUATED AS POROSITY AND INCLUSIONS IN THE CAST MATERIAL (HEAD SIDE).

SKETCH & SCAN DIRECTIONS PERSONNEL g[r a.

4 Examiner:

K.d/ LE SQU LEVEL II Examiner: ,

% I 9 # W.L. THOMAS' LEVEL W -A l Contractvr Review: $M1[dbD (

+/-/f~E9 Date .

NSP I Review: k'flaL.s _- l/i'Si Date '

e iew O '

a 63 Date utrpt rev 7/88 Page 1 of _Z_

I

-- ___-.-______-______-___________________A

1 REJ 4 4 RECALLED HEHORY #10 ** '

61.0dB l.373 in/DIV

l'ELAY li.000 in 2EF0 16.-10 us PILIER ? 4 HH; 0hMPill6 400 OHMS

'iATE SinPi 1.304 ni ENERGY L011 1

'f TL 1.llt.lH I4. J.? u'l FULL WAl'E ,

fiTE LEHEL IM T/R N0['E i L 0.1253 ivu:. J 60.0".' 5.500in L

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NORTHERN STATES POWER COMPANY CAL REPORT Power Production Department NUMBER: KJL-001 ULTRASONIC CALIBRATION REPORT CALIBRATION BLOCK: Type VESSEL Procedure # / Rev S/N 25A Material CS Size N/A Thickness 5.550 Temo 79 'F Entry Surf 00 NSP-UT-3 / 4 A'/

REFERENCE BLOCK Plant PI UNIT II Tvoe ROMPAS S/N 404 Temo 79 'F ULTRASONIC INSTRUMENTS: RECORDER: Exam Mfr PANANTRICS Mfr NOT USED Mfr NOT USED Company LMT, Inc.

Model 2002 Model N/A Model N/A S/N 864 S/N N/A S/N N/A Calibration Data:

Recal 10/07/89 Recal N/A Recal N/A Date 04/12/89 SEARCH UNIT CABLE: COUPLANT: Start 0 1030 Type BNC/BNC Length 12' B/N 5488 Check 0 N/A Final 0 1247 SEARCH UNITS:

S/N Angle Freq. Wave Mode Mfr Size Wedge Mfr.

A52 60 2.25 SW HSC .50 x 1.0 HARIS0NIC BEAM ANGLE DATA:

Serial Index Refracted Angle In Number Check Reference Block Calibration Block .

A52 OK 60 deg 61 deg AMPLITUDE LINEARITY (Signal 2 Shall Equal 50% of Signal 1, 15% F.S.H.)

Signal 1 (Set) 100 90 80 70 60 50 40 30 20 10 MASTER: Signal 2 (Read) 50 45 40 36 30 25 20 15 10 5 AMPLITUDE CONTROL ACCURACY Amplitude Setting: 80% /- 6dB 80% /-12dB 40% /+ 6dB 20%/+12dB Acceptable Range: 32% to 48% 16% to 24% 64% to 96% 64% to 965 MASTER, Actual: 40% F.S.H. 20% F.S.H. 80% F.S.H. 80% F.S.H.

INSTRUMENT SETTINGS AT REFERENCE SENSITIVITY FLAW GATE SETTING l Straight Beam Angle Beam Gain N/A' 61 dB Start 1.5 div Frequency N/A 2.25MHz. End 10 div i Sweep N/A 1.373 l Delay N/A 0 Beam Spread Page 2 l Damping N/A 400 i Reject N/A 0 Signal to Noise Rep. Rate N/A N/A Ratio N/A 4

+

Filter N/A 2-4 REMARKS: ID NOTCH 15% 0 + 6 dB PERSONNEL: ///

Examiner //s , 9V II Contractor K. # LlVESQUp Level Review z#dN/_ 8[ << -/ .F -f9 Examiner - -

I NSP W.L. THOMAS Level Review (dO h- [#ff Date Examiner t>b ANII A (' \ '

Level Review \O i\ \ri

'l\)4 f# '

Date gk Examiner Level utcal rev 8/88 Page 1 of i. l

NORTHERN STATES POWER COMPANY Calibration POWER PRODUCTION DEPARTMENT Report Number:KJL-001 ULTRASONIC CALIBRATION REPORT BEAM SPREAD DATA: Surface Distance, Range, and Metal Path at:

Leading (50% Maximum) Maximum Amplitude Trailin0 (50% Maximum)

Surf Sweep M.P. Surf Sweep M.P. Sur? Sweep M.P.

T/4 2.73 2.3 3.10 2.37 2.0 2.75 2.12 2.7 2.48 2T/4 5.53 4.5 6.51 4.68 4.0 5.40 4.40 3.5 5.07 3T/4 8.06 6.7 9.23 7.19 6.0 8.36 6.67 5.5 7.70 ST/4 0.00 0.0 0.00 0.00 0.0 0.00 0.00 0.0 0.00 PLANAR 10.30 8.6 11.82 9.81 8.3 11.33 9.01 7.6 10.62 DISTANCE-AMPLITUDE CORRECTION (DAC) CURVE PLOT (AT REFERENCE SENSITIVITY) 10 --

A 9--

1

. M 8- +

P 7--

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