ML20087N775

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Affidavit of Gd Larson & Dr Cady on Valve Wall Thickness of RCPB Valves
ML20087N775
Person / Time
Site: Diablo Canyon  Pacific Gas & Electric icon.png
Issue date: 03/16/1984
From: Cady D, Larson G
BECHTEL GROUP, INC., PULLMAN POWER PRODUCTS CORP. (FORMERLY PULLMAN, INC.)
To:
Shared Package
ML16340E243 List:
References
NUDOCS 8404040375
Download: ML20087N775 (7)
v • d • e


Text

_ _ - _ .-. - . _ - . . _ ._.

l EXHIBIT NO. 8 UNITED STATES OF AMERICA NUCLEAR REGULATORY COMMISSION

, BEFORE THE ATOMIC SAFETY AND LICENSING APPEAL BOARD

)

In the Matter of )

) Docket Nos. 50-275 PACIFIC GAS AND ELECTRIC ) 50-323 COMPANY )

) (Construction Quality Assurance)

-. - -. (Diablo Canyon Nuclear Power )

Plant, Units 1 and 2) )

)

AFFIDAVIT OF GARY D. LARSON, DANIEL R. CADY STATE OF CALIFORNIA )

) ss.

COUNTY OF )

( SAN LUIS OBISPD )

The above, being duly sworn, depose and say:

I

l. I, Gary D. Larson am employed by Pullman Power Products a's an NDE Level III Technician, qualified in radiography, ultrasonic, magnetic particle, and liquid penetrant testing.

I, Daniel R. Cady am employed by Bechtel Group Inc., as an Engineering Supervisor, NDE Level III, qualified in radiography, ultra nic, magnetic particle and liquid penetrant testing, visual examination, and bubble testing.

l 0 00 5 -

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2. We have reviewed the records of the wall thickness measurements of reactor coviant pressure boundary valves which were made in 1973 for Unit 1 at Diablo Canyon Nuclear ?ower Plant. We also have read the portion of the j

Unscheduled Audit #34 of Harold Hudson pertaining to the boundary valves which allegedly did not meet the 2% accuracy requirement of the AEC. We reviewed i

the data report for the two valves: 1-8067-C and 1-8956-C.

3. Valve location 1-8067-C was shown on Unscheduled Audit #34 as having calibration data as 10% out of tolerance. As shown on the data report for the valve (Exhibit 1 attached), the calibration block has four points of reference l used for each calibration data. All the points but one match the pretest calibration. The point that does not show the same is lower by approximately 10%. This is quite obviously an error of the pencil and not of the actual test. Only two points are, in fact, needed to check an ultrasonic machine calibration. The lowest point of calibration and the highest point match the

~

pretest calibration data, thereby verifying the machine's valia calibration ,

within the 2% tolerance.

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4 When one compares the entries of paragraph 3 with paragraph 5, which represent calibration before ar.d after the test measure, respectively, one can see the direct correlation of instrument readings and the obvious absence of one digit.

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5. Valve location 1-8956-C was identified in Unscheduled Audit #34 as having accuracy out of tolerance by 48%. All valve calibration block data on the data report (Exhibit 2 attached) before thickness measurement matches the calibration block data after the thickness measurement (paragraphs 3 and 5).

The 48% difference is noted on the data recorded between the mechanical (micrometer point) and the actual UT measurement of the mechanical point.

6. The Mechanical Point was 1.062 and UT was 2.050 after thickness measurement versus Mechanical Point 1.062 and UT 1.050 before thickness measurement. If all calibration block data matched before and after thickness measurement, as they did, there is no possible way the after thickness measurement of the mechanical point could be '2.050. This was again an obvious pencil error and not an equipment error.

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\.

DATED: March 16,1984 OiAl r hAAf]

GARY D. LARSON NIEL R. Y Subscribed and sworn to

, before me this 16th day of March,1984 1 .- OFFICIAL SEAL M 2/ 19 CUTRA Ida Dutca e ' %'T4 g; .

s, Notary Public in and for the lY.d@qnonv.:'1-cA.:mL,n,$[  ; [.$$

.) County of San Luis Obispo, - - - - - - - - - - - - -

- =

State of California.

My commission expires January 2, 1987 t

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5. Valve location 1-8956-C was identified in Unscheduled Audit #34 as having accuracy out of tolerance by 48%. All valve calibration block data on the data report (Exhibit 2 attached) before thickness measurement matches the calibration block data after the thickness measurement (paragraphs 3 and 5).

The 48% difference is noted on the data recorded between the mechanical (micrometer point) and the actual UT measurement of the mechanical point

6. The Mechanical Point was 1.062 and UT was 2.050 after thickness measurement versus Mechanical Point 1.062 and UT 1.050 before thickness measurement. If all calibration block data matched before and after thickness measurement, as they did, there is no possible way the after thickness measurement of the mechanical point could be 2.050. This was again an obvious pencil error and not an equipment error.

DATED: March 17,1981 /

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DANIEL R. CADY Subscribed and sworn to before me this 17th day of March, 1984 NOAlbA- 6 -

Wendy Sprou1(/ 8 Notary Public in and for the County of San Luis Obispo, , _ _ _ - - - _ _ _ _ _ _ _ - - _ ,

l State of California. 1 OFFICIA1 SEAL J

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SAN LUt3 08tSPo COUNTY My comm. expires JUN 30,12 8 smw .

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o l EXHIBITS

1. Data report for valve 1-8067-C ,
2. Data report for valve 1-8956-C

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% qnzone no. 1 .-

  • 1. Ys3ve Identifica-'r . 1 . Unit No, f ,  !!fr. i g y,,6 Location !!o. /-6 0 6 7- c. __. Type _,2 75e I

P.cmarks: (S/:,!;li, !!tc.) o e R p.t A "R qg1 i~. .

2. Test !;.quipment: eli r._3g w s e v I:odci__g,o 3 S/N

, y ,, o (, o Transducer: $/ i r .

( .

Frequency L fg n IG. Couplant. d /, y e , p i N .

3. Calibraticn: Step i.cdge materici 7/4 pu ,, ,A A L _ ,c., ugg,oyo .

Kctusi step thichncs : A ,9o 7 . 11 ,yWy C , uq ; o , 19 7

. Ultr: sonic rc: dings: A g, a a B .13 o C soo D , ,, ,.o -

Calibration check (t:hcri p_ossii e on velve): lect::nic 1gy UT ,.rJg ,

Perforr.cd by: 42. sfM Datc: '

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(:;cler to Step 7.3.1 for Grid _f.ay-out)

4. Valve Body !tessure :nt: ,

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1- 3 4 5 l

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. .. A uL4 .ofa .57 n R-f & SO l.PfS (doi ,

,55 /5o . L_r4 l. 44'O .41p_lg$ .sc 3 o 63 lQ-I__

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e it .no .no ou .ao lisof l-l .- .

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F .174 '

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un f .ne f.no 1 ..m im oli-: les_ ns !. e.,s L 1 n a .s w i m li.o,o poo r- r .' c.g o l u i. m !

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. Note: ,1f ancitional sp:ce is requirca, :: zen p cs as requ2 red. ,

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D:ter ((Nh 5 Heasurc=ent en:1 Post C:libr: tion by:g..j/I _ _- 2 Actu:1 stcp thichness: A . 9 9 .g, D & ./ C ' y q y 0 d.y *

. Ultrasonic readings:

A n e O D y ,o C'""Afg D Go

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C libr: lon enech (when pessiole c vcivcj : !:censnical E4 UT gjf

6. 1.'s.1,michnes s : ;!1n. :llowed ,a 3 7 ,

Min. obt:inc.! '

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8. VIvePr'orectionrc$torcEby:Vsive Identified pc- Ste--to 7 5'5[ir w Date: - =>.w
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1 S..W..5.f.EaI"OsE[irsowe mnt peoJnCT CEMmm. m.m. -

Scri.".1 !!o'. o f !!icro=c;cyn .g,g p 4, g ap [g

e;x n101 t No. 2 l

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l a e:pc:.':7,__j,g 6, _gry_l_i .

ni.. Coup 1a.: ee 2,yc,,,s_

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. i l C.:) i D::.1 i s.n :. :h ep utd ,: n.ai eri.,1_p_ggy ,_ pyy,gr,9_y_g gLS gripyff

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g Illtrar.r::!c 1.::rlinit::: . Aj. p o IJ J ,4 d d _ _ C_,f g p g _ _ ,,D_ f,o o o , .  !

C:: lit r:::ir.:*. cheek, (uhen pe .: >!c on v c): itech:: tca ly.S_._._,u 2 rfmq. j Ferfc,r:;rd by: " Qg l ,

Dato: jj_.,2 g ,_ p y .

/, . Yah c h,.*y !.'cartsrca::nt: i:c:cr to 5:.cp  ?..,s.1 for Grid 1.ay-o:::) ,

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Acto: li additionn.t. specc as ecquire:i, .:isen pa;cs e.r. req:n. red.... .

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D ,. .' O-5, Henurchet r.nd Post Calibration by:- . . . . . . . . - . .

A:tual stcp thickncss: A_2;yS9 a j,qSf C tiprfC" D 997

,r___ =- Date: // 1:29373 5 Ultrasonic readings:

,A 2 540 B.2,ooo C ./. 3 og o ). goo - -

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-, Cal 3brataan c::cch (when possicle on valyc): J.;cenartieni j,' o g 2. *

. tiall T..lchne:s: '!1n. allowed /.3 /o Alin. ,

I.rr 2.m o obtained /, g j ,;-- '

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. .c 1dentif:cd 1,rotecticnper restored Step 7.3.5 by: by: .

x2I*M., Date: //_ 2 4. p g Date: j, _ 2 c. 7 y . , 1 ":

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