ML17328A255

Forwards Addl Info Re Util 900126 Revised Response to NRC Bulletin 88-002,per NRC 900509 Request

ML17328A255
Person / Time
Site:	Cook
Issue date:	06/05/1990
From:	Alexich M INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
AEP:NRC:1056B, IEB-88-002, IEB-88-2, NUDOCS 9006130257
Download: ML17328A255 (47)

Text

ACCELERATED ISTI?JBUTION DEMONS~RATION SYSTEM REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS) 06130257 DOC.DATE: 90/06/05 NOTARIZED:

NO DOCKET nald C.

Cook Nuclear Power Plant, Unit 1, Indiana 6

05000315 na d C.

Coo Nuc ea o e Un t 2

Indiana 6

05000316

SUBJECT:

Forwards addi info re util 900126 revised response to NRC Bulletin 88-002,per NRC 900509 request.

DISTRIBUTION CODE IE13D COPIES RECEIVED:LTR ENCL SIZE:

ACCESSION NBR:90 FACIL:50-315 Do 50-316 Do l k

l rPwrPlan AUTH.NAME AUTHOR AFFILIATION ALEXICH,M.P.

Indiana Michigan Power Co.

(formerly Indiana 6 Michigan Ele RECIP.NAME RECIPIENT AFFILIATION Document Control Branch (Document Control Desk)

NOTES RECIPIENT ID CODE/NAME PD3-1 LA GIITTER,J.

COPIES LTTR ENCL 1

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1 RECIPIENT ID CODE/NAME PD3-1 PD COPIES LTTR ENCL 1

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1 1

1 1

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1 1

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1 NRR MURPHY,E NRR/DOEA/OGCBll 8E2 REG PI 02 FILE 01 NRC PDR 1

1 1

1 1

1 1

1 1

1 1

1 NOTE TO ALL"RIDS" RECIPIENTS:

PLEASE HELP US TO REDUCE WARM CONTACT THE DOCUMENT CONTROL DESK, ROOM Pl-37 (EXT. 20079) TO ELIMINATEYOUR NAMEFROM DISTRIBUTION LISTS FOR DOCUMENTS YOU DON'T NEED!

TOTAL NUMBER OF COPIES REQUIRED:

LTTR 16 ENCL 15

Indiana Michigan Power Company ~

P.O. Box 166"'otvmbvs,0, I 43216 lNQlANA NlCHIGAbf PWKR AEP:NRC:1056B Donald C.

Cook Nuclear Plant Units 1 and 2

Docket Nos, 50-315 and 50-316 License Nos.

DPR-58 and DPR-74 NRC BULLETIN 88-02; REQUEST FOR ADDITIONALINFORMATION U.S. Nuclear Regulatory Commission Attn:

Document Control Desk Washington, D.C.

20555 Attn: T. E. Murley June 5,

1990

References:

1)

Letter AEP:NRC:1056A, M. P. Alexich (Indiana Michigan Power Company) to T. E. Murley (NRC),

"NRC Bulletin 88-02; Request for Additional Information," dated January 26, 1990 2)

Letter J.

G

~ Giitter (NRC) to M. P. Alexich (Indiana Michigan Power Company),

"Request for Additional Information (RAI)-Donald C.

Cook Nuclear Power Plant Unit 1-Response to NRC Bulletin 88-02," dated May 9, 1990

Dear Dr. Murley:

Our letter of January 26 1990 (Reference

1) revised our response to NRC Bulletin 88-02, "Rapidly Propagating Fatigue Cracks in Steam Generator Tubes."

Our revised response concluded that there were no indications of service-induced tube denting in the 'Cook Nuclear Plant Unit 1 steam generators.

Following the submittal of the revised response, members of your staff requested additional information regarding our basis for arriving at this conclusion (Reference 2).

The attachment to this letter, which describes the evaluation conducted by our consultant, Conam Nuclear, Inc., is provided in response to this request.

9006}30257 900~':.0 PDR ADOCK 000031!=I 9

PD(".

P(pl9

Dr. T. E. Murley AEP:NRC'1056B This document has been prepared following Corporate procedures that incorporate a reasonable set of controls to ensure its accuracy and completeness prior to signature by the undersigned.

Sincerely, M. P. Ale ich Vice Pre ident MPA/eh Attachment cc:

D. H. Williams, Jr.

A. A. Blind - Bridgman J.

P. Padgett G

~ Charnoff NFEM Section Chief A.

BE Davis

- Region III NRC Resident Inspector

- Bridgman t

ATTACHMENT TO AEP:NRC;1056B BULLETIN 88-02:

REQUEST FOR ADDITIONAL INFORMATION

ATTACHMENT TO AEP:NRC:1056B Page 1

The following provides the additional information requested in regards to NRC Bulletin 88-02, "Rapidly Propagating Fatigue Cracks in Steam Generator Tubes."

Re uest No

~

1 Describe the data analysis guidelines and criteria for the detection of support plate corrosion and the presence of magnetite in the support plate crevices.

~Res ense In November

1988, a review of eddy current data was performed on selected tubes from the 1985 and 1987 inspections of the Cook Nuclear Plant Unit 1 steam generators.

The contractor selected for the review, Conam Inspection (now known as Conam Nuclear, Inc.),

was asked to evaluate the data with regard to service-induced

denting, evidence of upper support plate corrosion, and the presence of magnetite in the tube-to-support plate crevices.

Rather than establishing specific guidelines or reporting criteria prior to the review, I&M relied on Conam's expertise and experience to perform an appropriate review.

The following is an outline of the method used by Conam's analyst to evaluate the bobbin coil eddy current data; 1.

Establish a 400/100 kHz differential mix.

a.

Suppress simulated support ring on ASME standard.

b.

Set probe motion horizontal with the 100 percent through-wall artificial flaw going down and to the right first.

2.

Using 400 kHz, set volts using the simulated support ring on the ASME standard to six volts and store to all channels.

3.

Evaluate the seventh support plate on both the hot and cold legs for denting and evidence of corrosion or magnetite.

a.

Denting 1)

Signal in the 400/100 kHz differential mix is horizontal, moving to the left first (see Figure 1).

ATTACHMENT TO AEP:NRC:1056B Page 2

2)

Dent signal is confirmed us ing 400 kHz differential or 400 kHz absolute.

b.

Corrosion or magnetite 1)

Toggle through all channels for distorted signals (i.e ~

, anything other than normal support plate signals as shown in Figure 2).

2)

When di.storted signal is observed in the support plate crevice, report distortion as magnetite if the 100 kHz differential signal moves in an upward direction first and the 400 kHz differential signal moves down first (see Figure 3)

~

3)

Observe 10 kHz differential for evidence of support plate ligament damage which would be indicative of severe corrosion.

The above described method was again used during the April 1989 Cook Nuclear Plant Unit 1 inspection.

The results of the evaluation indicated that magnetite at the upper support plate was not detected, and that signals reported as dents were actually located at the upper or lower edge of the support plate and were very small in volume.

(As noted in the previous submittal, these signals remain unchanged and are believed to represent manufacturing "dings" as opposed to service-induced denting.)

Re uest No.

2 Describe the bases for these gui.delines and criteria, including a description of mockups and calibration standards employed.

R~es ense The method used to evaluate the Cook Nuclear Plant Unit 1 eddy current data for the. detection of support plate corrosion and the presence of magnetite in support plate crevices is considered ski.ll-of-the-trade by Conam, and is included in the analysts'raining program.

This formal training program includes the "Conam Data Analysis Manual" and the EPRI NDE Center's "Manual of ZSI Training."

Training instructions relative to magnetite detection are based in part on an EPRZ study which was reported by S.

D.

Brown at the Third Annual Steam Generator NDE Workshop in June 1984, entitled "Array Coil Detection/Characterization of Magnetite Within the

ATTACHMENT TO AEP:NRC:1056B Page 3

Support Plate Crevice Gap."

While the study was performed using array coil technology to evaluate the degree of magnetite packing present at a tube-to-support plate intersection, the results can be extended to bobbin coil data for detection of magnetite.

Conam has augmented the training by familiarizing analysts with actual field data from plants with denting and magnetite formation (see Figures 4 and 5).

Re uest No.

3 Describe how the data analysts'omprehension of the data analysis guidelines and criteria was assured.

~Res ense All of Conam's data analysts are trained and qualified using all sections of the training cours'e.

The evaluation of the Cook Nuclear Plant Unit 1 data was performed by D. Michael Chambers, Level III Eddy Current.

Copies of Mrs Chambers'esume and certification of qualification are attached for reference.

In addition to having been the lead analyst for second party review of all eddy current inspections conducted at Cook Nuclear Plant Units 1 and 2 since late 1985, Mr. Chambers has extensive experience at PWR plants throughout the world.

As such, he is in an excellent position to critique the Cook Nuclear Plant Unit 1 data relative to other plants with known magnetite denting.

Re uest No.

4 Pages 1 and 2 of the attachment to the licensee's January 29, 1990, letter refer to "45 dents" or "signal anomalies previously reported as dents" which were subsequently "determined to be insignificant."

Please provide a copy of the field eddy current data for a representative sample of these signal anomalies.

~Res onse Figures 6 through 34 provide the requested data.

An example of a "normal" support plate is included, as well as examples of signals classified as "dents" and "small distorted signals."

CONAM INSPECTION January 8,

1986 RESUME D. MICHAEL CHAMBERS Social Security Number:

559-74-5542 Birth Date:

April 14, 1948 Level III Eddy Current Level IIA - Eddy Current Data Analyst Level II - UT EDUCATION General NOE Oriented Amador High School Pleasanton, California Diploma 1966 Date 1971

~Len tb 12 Weeks

~Sub'a.t NOE Trainilng

~Given 8

Chanute Air Force Base U.S. Air Force School Rantoul, Illinois 3/1979 5/1984 BPLOYMENT 20 Hours Eddy Curr nt Data Analysis 8 Hours Eddy Current MIZ 18 Conam Inspection CONAN INSPECTION Richmond, California CONAN INSPECTION March 3 1982 to Present NDE Technician Level III - Eddy Current Level IIA Eddy Current Data Analyst Level II - UT I<arch 1976 to October 1979 I'IDE Technician Level I - Eddy Current Operator Lev'el IIB - Eddy Current Operator Level IIA - Eddy Current Data An lyst Level II - UT U.

S.

AIR FORCE Rantoul, Ilinois Auqust 1.966 to 'larch 1976

'IDE Instructor e arear ov'aaaacovvv

1

CONAM INSPECTlON CERTIFICATIONOF PERSONNEL QUALIFICATION SSN:

559-74-5542

%P

++Mf CHAMBERS D.

MICHAEL METIIOD LEVEL EC IIA DATE 3-18-85 CERTIFICATIONS R.Marlow ER EXAMSCORES PfUK 92.0 DATE 80.0 100

COMP, 90.8 TNG.

I IRS.

20 RECERTIFICATIONIRESTRICTIONS WT FACTOR:

.3

.3

.4 EC III 1-8-86 R.J.Slack BASIC ETHOD 88.0 93 F 9 SPEC PRAC 95 '

100 COMP 93.57 O.Gamble 12-8-86 O.Gamble 12-8 1-10-89 It.J. SLACK 88.0 94.62 80.0 100 R. Marlow 1-EXPERIENCE FROM TO WT FACTOR:

.3

.3

.2

.2 COMPANY NDTMETHODS h HIGHEST LEVELATTAINED 8 1971 3/1976 3 1982 3 1976 10/1979 Present U.S. Air Force Conam Inspection,

Richmond, Cal ifornia Conam Ins ection, Richmond, California NOT S ecialist Instructor Rating)

Leve II, UT, MT, RT, T,

C Eddy Current Level IIA, 7-19-82; Level III,

-, 8-o EYE EXAMINATIONS DATE EXAMINEDBY DATE EXAMINEDBY Iove()

EDUCATIONANDTRAININGIHIGHEST PUBLIC,ADVANCEDANDNDTI Camp e

SCI.IDOL LOCATION DA'TE LENGTH SUB) ECT 7-8 Conam Ins ection Conam Ins ection hanute FB Il.

11-1 12Wks 3-79 20Krs

Richmond, Ca 5-84 8 Hrs

Richmond, Ca ND 20 Hr Min. E.C.

E.C.

Data Anal sis E.C. MIX-18 In accordance with the Conam Division Procedure 99-CN TP-003 and the 1 984 Edition ofSNT-TC-IA.

"Allhistorical information supplied by me to compile this certification is true and correct to the best ofmy knowled COMMENTS

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Figure 12

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Figure 13

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Figure 16

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Figure 17

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11, Tube R14C3, 7th cold leg support Representative "anomalous" signal at support plate intersection (400 kHz differential and 200 kHz differential shown in top and bottom displays; see Figures 19 and 20 for additional channels)

Figure 18

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Figure 19

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Figure 21

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Figure 22

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Figure 23

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Figure 24

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>> 4tt (H<<tl M(H 24 I'. 9 \\ ~ I t ~ I I ~ FLAttT tt:IIT 5 0 LEG OAIE (LV 20211 Cook Unit 1 SG Ho. 11, Tube R12C4, 7th cold leg support Representative "anomalous" signal at support plate intersection (100 kHz differential and 100 kHz absolute shown in top and bottom displays; see Figure 25 and 27 for additional channels). Figure 26 ae ~ CH n I VERT - CH 6 VERT CHAtotEL HO ttIX4 ll ltNI 12 COL 4 DISPLAY GAS 1 '5 SPAN 58 ROTATION 245 DEO gFT STRIP CHART CHAN4 tl IV CHAHS I 5 SKI 88 ROTATICN 245 DEO RIGHT STRIP CHART CBOOK 6V FREO 188 kNz SPAN 278 ROTATION 278 DEG t~tlYKN OIJ OILER ERICH t4ltK 6088 1N 4 ot CtQN-8 5152t49 AN ttARCH 24 1989 PLANT VHIT Sr G LEO DATE 0 CI COOK PEV881 I ll INLET 84/24/Nl SLK 26211 -CHtt 1 VERT -CH 6 VERT 04tHtCL HO HIX4 1 c ~ VV 4 I ~ ~ .0 11 RON 12 COL XY DISPLAY O%N4 tt CHAHS I 5 SPAN 38 ROTA'TIOH - 24S DEG LEFT 5TRIP CHART CHAN4 tl IV CHAHS 1 5 SPAN 38 ROTATION 245 OEO RIGHT STRIP CHART CHAH4 6V FRED 188 kH-278 ROTATION 278 DEO SYSTEtt CGtFIGDRATIOH HAttE 8068 1N ~ ot CHAN 8 5t52t49 AH ttAPCH 24 1989 PLANT tP41T SiG LEG O.Co CCOK REV881 1 1 1 ItMT DATE 84r24r89 SLK 26211 Cook Unit 1 SG No. 11, Tube R12C4, 7th cold leg support Representative "anomalous" signal at support plate intersection (400 kHz differential mix at -0. 1 inches and +0. 5 inches shovn in top and bottom displays; see Figure's 25 and 26 for additional channels). Figure 27 ~ ~ HII I M>T (H 8 YERT << CHAHttEL IIO I 30 ll PGII IZ CGL YY Ot<<PLAr (HAII<< FEEG 400 IH<< <<SPAII13 POTATIOII <<55 CEG ~ I LEFT <<TRIP CHAPT CHAttt<< - II IY (HAttS - 1-5 SPAII - 15 ROTATIOII 845 GEG PIGHT STPIP CHART CHAtt<< ttY FPEO 100 kHz SPAII 2)0 ROTATI(II 270 OEG SYSTEN CCttFIGURATIOH IF4IE 8088ltt tt of CHAII-8 5t52t49 Att IIAR(H 24 1989 tI 4 ~ !, ~ 1 ~ ~ FLAI IT Ltt IT 9<<G LEG GATE O.CD CCGtt fEV001 I ll IILET SLI. -8211 vp <<i'.<<+'<+r"!3!~ It<<!~'0<<t>>'H tt I 'EET I {H 8 SEPT iHAtitEL IIO 3 I / n,n "0 ','GII 12 iGL iii 0!'IPLA'I <<'<<Att<<3 E EO 200 RH= '. PAtt -- ~ 0 RGTATIOII 5 ('EG LEFT <<IPIP (HART CHAtt<< tt IY (HAIIS - I 5 SEAtt PGTATIGII 245 CEG PI{4IT STPIP CHAPT <<'HAtttt EEEO --- 100 IH= <<Pitt <<FO POTATICII - 2;0 OEG SYSTEII C(ttF IGVPATI(ql IIAIIE - MBltt <<ot (HAII 9 'tt49 IQKH 24 1939 r ~ << ~ t t ~ I ~ ~ fLi4 IT tAIII 3 0 LEG GATE ELti 28411 O.C. (GfJI: BEY{<<TI I Il II4.ET 04<<24<<89 Cook Unit 1 SG No. 11, Tube R12C4, 7th hot leg support Representative "anomalous" signal at support plate intersection (400 kHz differential and 200 kHz differential shown in top and bottom displays; see Figure 29 for additional channels). Figure 28 - CH tt I vEET+ - (H 3 VEPT ~ (HAHttEL ttG 5 Ttt A.A !O ll FGH 12 COL 'TT 01'%LAY (HQte 5 FFEO 100 I,H

PQI - -

POTATIGII 120 OEG LEFT BTPIP I:HAPT (Hatt+ tl IV (HQt3 <FQI POTATIOI 245 CEG PICHT BTPIP CHAPT (HAtto BV FFEO 100 kH -PAtt ~20 ROTATION 270 DEG 5YTTEH COIIFI(4IRATIOI ttQIE EGEBltt i of CHAtt-3 5t52t43 Atl ttARCH 4 1333 I 4 I~ t t ~ PLAIIT LTIIT 5 0 I.EG CATE ELt; 23211 O.C COOK PEVOOI I I'I fttLET 04i24~23 '.H tl I VERT+ (H 3 YEPT il (HQttiEL t'0 itG 11F.GH 12 (CL ,',Y GI:FLAY (uQto 3 FFE+ 100 LH-

.Fill 2, 0 OTATIOtt -

2 0 GEG 'I ~ A.A I t.EFT rlP (HART (Vitt+ tt IV (}:itt-5

-FQI 15 FOTATIOII -

245 GEG PIGHT ETPIP CHART IRAQI~ EV FFEO IOO LH -tQI - ~TO cGTATIGII - 2.0 BEG vv:TEtl (OttFI(4JFATI(tt I"ittE %Bitt i At (HQI ttAFCH 4 I:+ ~ N I. 4 ~ I ~ I I ll I i, I <<ttt<r tptll'~G LEG GATE CLT, 23211 0 C COOK FBr%0I I ll It%.ET 04>24'3 Cook Unit 1 SG No. 11, Tube R12C4, 7th hot leg support Representative "anomalous" signal at support plate intersection (100 kHz differential and 100 kHz absolute shown in top and bottom displays; see Figure 28 for additional channels). Figure 29 ~ I - (H tt I VERT - (H 0 VERT g CHAIIHEL IIO I 70 Il RCQ I3 CGL

IY OISPLAY (HAH+ -

I FPEO 400 kHr ~WI 36 ROTATIGII - 255 GEO LEFT STRIP CHAR'I CHAtl+ tl IV CWIS 1-5 NQI -0 ROTATIII 245 OEO RIGHT STRIP CHART CHAItt FREO 100 VH SPAtl ~hO .~IATIQI - 270 OEG SYSTEtl COIPIGUPATIOI IQtE 0028lt I + oT (HAtt- 0 II ~I ~ ~ 0 FLAIIT O.C CG(K PEVOOI IRII7 &'6 LEG I 11 IIR.ET CAtE Qw24r09 h I ~ lI I ~ I I ('. '5150 (H lt I ':EAT+I -(H VERT (HAIN@.,IIG 3 !tG ll RGII I-COL OI ALA( I 4I'+ ccn 00 Att RGTATI(tt 5 OEG I 7 7 t ~~ o 7 I I n-.r LE-T TF IP (HART (r>i~ - I'I IV

, Art rGTAT1(tt 245 CEG I(HI.hTPIP (HART

, gala F~EO --- IOG IH= FAR >TG I h! IA'IIGII <<,0 SY:TEII ((IXIGWATIOtt t PE "- EOEBItt ~ he (HAII-3 ~ ~ I e I ~ ~ 4 'h ~ ~ PLAIT atter > 0 LEO TE CLt, 25'50 (.,C. K~ PEVOOI l II%.ET Cook Unit 1 SG No. 11, Tube R13C4, 7th cold leg support, Representative "anomalous" signal at support plate intersection (400 kHz differential and 200 kHz differential shown in top and bottom displays; see Figures 31 and 32 for additional channels). Figure 30 (H tt l VERT) CH Gr VERT CHAttttEL ltO 5 '(r II F(41 18 COL

.F DISPLAY (HAt~ -

5 FFEO 100 tH SFr4t F4 FOTATIOII 188 OE( 1.EFT STPIP t:HART (HAtt~ H IV (HAttS I '5 dkt - 80 ROTATIOII 845 OEG FIGHT STP.IP CHART (HAtt+ 6V FRED 100 RH: SPAtl 870 .~<<IATIOII - are OEG SYSTEtl COttFIGURATIOtt ttAttE GGEGIII + ot CHAtt-8 ~ ~ ~ I 'I 1 ~ ~ PLAttT UtII '1 Sr 0 LEG DATE O.C COOK FEV081 I I I IILET 04r 84~ ELt: 85150 - (H tl I VERTr)- CH 8 VERT r n,r CHAtwtEL IIG 8 ISG ll F.OII I'OL 4

.Y (rISF LAY (HAtti 8

FceO 100 RH SFAtt Gs 0 FOTATI(kl 870 OEG ( LEFT STPIP CHAPT r (HAt+ tt IV CHFttj I 5 TFAtt . 0 FOTATIQI 845 GEG RKrtT STRIP CHART (Mt+ GV F KO - 100 SH-

Fr4t ---

ETO '~t IATIDtl-870 OEG SS - TEH COttFIGUPATIGtt tr<tE EG88ltt (HAtt 8 4 r FLAIIT UIIIT 5:0 LEG DATE O.C. (GO: FEVG01 I 11 ItLET 04IE4r89 GU'5~A Cook Unit 1 SG No. 11, Tube R13C4, 7th cold leg support RepresentatisFe "anomalous" signal at support plate intersection (100 kHz differential and 100 kHz absolute shown in top and bottom displays; see Figures 30 and 32 for additional channels). Figure 31 CH H I VERT CH 6 VERT CKI44EL HO HIHI I II ROH IS CCL XV DISPLAY CHANt H I GAtS I& SPAH~ 38 ROTATIN 845 DEO LEFT STRIP CART CHAH1 H IV OASIS SPQI 38 ROTATIDH-245 DEO RIGHT STRIP QQRT CHWtt 6V FREO lee AH@ SPAH~ 278 ROTATIOH - ETe DEO STSTEH ~~gyaTIGH HQK 8088 IH ~ ol 0%H-8 Pl.AHT IRIIT S/0 LEO DATE DoCI CMK REVSOI I I I pLET ~2<JS9 SU( 2'5358 Cook Unit 1 SG No. 11, Tube R13C4, 7th cold leg support Representative "anomalous" signal at support plate intersection (400 kHz differential mix at +0.3 inches shown in display; see Figures 30 and 31 for additional channels). Figure 32 j ttt ~ ~ CH N I VERT - (H 6 VERT J CHAItHEL ttO I 60t ll ROtt II COL 5 HY DISPLAY (HAH>> - I FFEO - 4&iI kHz SFAtt 13 FOTATIOtl 25J5 DEG LEFT STPIP CHART CHAtt>> - tt IV CHAHS I-5 AN 15 POTATIOI 245 DEO tt~ + ~ I RIGHI'TRIP CHART CHAtt>> 6V FFEO 100 'kHz SPAtt 2rO ROTATION 270 DEQ SYSTEN COttFIGUttATIOtt NANE 8088 1N ~ of CHAN 8 6t00t46 Att ttARCH I>>4 1939 JII ~ I I I J I FLFztT IttIIT 'I'G LEQ DATE D.C. CGOt: PEVOOI I II IttLET 04~24~39 ELN 95r0 F< t>>>>y>> JEZ>>tt.>>z>>4 ~ >>Jt>>tt tt CH tt I I'EPT+( (H 6 VERT ATH CttAttttEL tiO 6 ~1/ / h.h '0 11 ROW ll COL "'l FLAY (t>>>>t>> 8 FF.EO 200 kHz !PAtt 5T ROTAT10tt - 5 DEG LEFT STRIP CHART (ttAtt>> - tt IV CHAIIS 1-5 'FAtl Ir FOTATIOtI 245 DFG PIGHT STPIP CHART CHAtt>> 6V FRED 100 IH- >>PAtt 270 POTATIOI 220 DEG STI'STEN IXktFIC4IRAZIOt t>>4tE 6068111 >> ot CHAtt-3

t00t46 Atl tVPCH 24 14>>9

,; ~ I' FLAttT tttIlT SiG LEG DATE O.C. CO% FEYOBI 1 'll IILET 04>24>>39 ELt'95TO Cook Unit 1 SG No. 11, Tube R11C5, 7th hot leg support Representative "anomalous" signal at support plate intersection (400 kHz differential and 200 kHz differential shown in top and bottom displays; see Figure 34 for additional channels). Figure 33 V - (H tl I VERT)j-CH 0 VERT ~ (HA<I<EL t<0 10 11 FGII 11 (CL At:.FLAY'H)4<! FFEO -- - I(0 IH- 'FA<I FOTATIOI 125 CEG LEFT :TRIP (HAFT (N<4<! N IV ~PSJ6 - 1-5 !PAH 15 ROTA'TIOt< - 245 CEG TH A / ~ ~ F.IGH'T STPIP CHAPT (<<A<I~ AV FFEO 100 EH )PAH 2TO ROTATlOI 270 DEG SYSTEN CO<PI(4<RATIO<I 0<'4<E BOPB It< ~ 0< (HE<- 0 EIOO<46 AII I'F4ICH 24 I?i? I) ~ ) I ), C I ) FL)4<T IFII T "!0 LEG CATE 0 C COW REVOBI I II it<LET 04!24&? ELI. 2?STO (H N I VERT)! CH 0 VEFT ) (HA<~IEL <Q

)0 II F(4< ll COL 5

0 ISFLAV ())~<<! F=EO 100 LHA Fwl 2i 0 FOTATIOI 2.0 GEG EFT STPIP (HWT > HA<I' e <I IV (HA46 - I 5 SFAI - 15 FGTATIII 245 CEG I I 'I l ) ATH $ ~ ~ Ai0 L~ PIGHT STPIP CHART (")4<4 BV F=EG 100 kH= FOTAT10<I - 2TO GEG S'")TEII CONF IGURATIOII <w'<E - 506BIH + <)) (t))4< 0 . <00<40 ))N I>FCH 24 I'; 5 ~ 0 7. I F LA<IT O.C. CO(e'EV&II IS<I '1 G LEO I I IIEET CATE 04!24~ BS ~ ~ ELK 2?5TO Cook Unit 1 SG No. 11, Tube RllC5, 7th hot leg support Representative "anomalous" signal at support plate intersection (100 kHz differential and 100 kHz absolute shosFn in top and bottom displays; see Figure 33 for additional channels). Figure 34