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)

ACCESSION NBR:90 06130257 DOC.DATE: 90/06/05 NOTARIZED: NO DOCKET FACIL:50-315 Do nald C. Cook Nuclear Power Plant, Unit 1, Indiana 6 05000315 AUTH. NAME l

50-316 Do na d C. Coo k Nuc ea AUTHOR AFFILIATION l rPwrPlan o e Un t 2 Indiana 6 05000316 ALEXICH,M.P. Indiana Michigan Power Co. (formerly Indiana 6 Michigan Ele RECIP.NAME RECIPIENT AFFILIATION Document Control Branch (Document Control Desk)

SUBJECT:

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

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NRR NE GHBORS i D 1 1 NRR/DOEA/OGCBll 1 1 NRR/DREP/PEP B9 D 1 1 8E2 1 1 NRR/PMAS/ILRB12 1 1 REG PI 02 1 1 RES/DSIR/EIB 1 1 FILE 01 1 1 EXTERNAL: LPDR 1 1 NRC PDR 1 1 NSIC 1 1 NOTE TO ALL "RIDS" RECIPIENTS:

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TOTAL NUMBER OF COPIES REQUIRED: LTTR 16 ENCL 15

Indiana Michigan Power Company P.O. Box

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0, I 43216 166"'otvmbvs, 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 ADDITIONAL INFORMATION 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 9

ADOCK 000031!=I PD(".

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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

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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 program. This formal training program includes the analysts'raining "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 Level III Eddy Current Level IIA - Eddy Current Data Analyst Birth Date: April 14, 1948 Level II - UT EDUCATION General Amador High School Pleasanton, California Diploma 1966 NOE Oriented Date ~Len tb ~Sub'a.t ~Given 8 1971 12 Weeks NOE Trainilng Chanute Air Force Base U.S. Air Force School Rantoul, Illinois 3/1979 20 Hours Eddy Curr nt Data Analysis 5/1984 8 Hours Eddy Current MIZ 18 Conam Inspection BPLOYMENT CONAN INSPECTION March 3 1982 to Present Richmond, California NDE Technician Level III - Eddy Current Level IIA Eddy Current Data Analyst Level II - UT CONAN INSPECTION 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 Auqust 1.966 to 'larch 1976 Rantoul, Ilinois 'IDE Instructor e arear ov'aaaacovvv

1 CONAM INSPECTlON SSN: 559-74-5542 %P CERTIFICATION OF PERSONNEL QUALIFICATION ++Mf CHAMBERS D. MICHAEL CERTIFICATIONS EXAMSCORES TNG. RECERTIFICATIONIRESTRICTIONS METI IOD LEVEL DATE ER COMP, I IRS.

DATE PfUK EC IIA 3-18-85 R.Marlow 80.0 100 92.0 90.8 20 WT FACTOR: .3 .3 .4 BASIC ETHOD SPEC PRAC COMP EC III 1-8-86 R.J.Slack 88.0 93 9 F 95 ' 100 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 WT FACTOR: .3 .3 .2 .2 FROM TO COMPANY NDT METHODS h HIGHEST LEVELATTAINED 8 1971 3 1976 U.S. Air Force NOT S ecialist Instructor Rating) 3/1976 10/1979 Conam Inspection, Richmond, Cal ifornia Leve II, UT, MT, RT, T, C 3 1982 Present Conam Ins ection, Richmond, California Eddy Current Level IIA, 7-19-82; Level III, -, 8- o Iove()

EYE EXAMINATIONS EXAMINEDBY EDUCATIONAND TRAINING IHIGHEST PUBLIC, ADVANCEDAND NDTI DATE EXAMINEDBY DATE SCI.IDOL LOCATION DA'TE LENGTH SUB) ECT Camp e 7-8 hanute FB Il. 11- 1 12Wks ND 20 Hr Min. E.C.

Conam Ins ection Richmond, Ca 3-79 20Krs E.C. Data Anal sis Conam Ins ection Richmond, Ca 5-84 8 Hrs E.C. MIX-18 In accordance with the Conam Division Procedure 99-CN TP-003 and the 1 984 Edition of SNT-TC-IA. COMMENTS "Allhistorical information supplied by me to compile this certification is true and correct to the best of my knowled

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Figure 11

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Figure 13

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Figure 14

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Figure 16

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Figure 17

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Figure 18

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Figure 19

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Figure 20

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

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LEFT r STPIP CHAPT (HAt+ tt IV CHFttj I 5 TFAtt .0 FOTATIQI 845 GEG RKrtT STRIP CHART (Mt+ GV - 100 SH-F KO

Fr4t ---

'~t IATIDtl - ETO 870 OEG n,r SS - TEH COttFIGUPATIGtt tr<tE EG88ltt (HAtt 8 4 r FLAIIT UIIIT 5:0 LEG DATE GU'5~A O.C. (GO: FEVG01 I 11 ItLET 04IE4r89 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 GAtS SPAH ~ CHANt ROTATIN I& H I 38 845 DEO LEFT STRIP CART CHAH1 H IV OASIS SPQI 38 ROTATIDH - 245 DEO RIGHT STRIP QQRT FREO SPAH ~ CHWtt ROTATIOH - 6V lee 278 ETe AH@ DEO STSTEH ~~gyaTIGH HQK 8088 IH ~ ol 0%H- 8 Pl.AHT IRIIT S/0 LEO DATE SU( 2'5358 DoCI CMK REVSOI I II pLET ~2< JS9 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 - I FFEO SFAtt (HAH>> - 4&iI kHz 13 FOTATIOtl 25J5 DEG CHAHS CHAtt>> -I-5 LEFT STPIP CHART tt IV AN 15 POTATIOI 245 DEO RIGHI'TRIP CHART tt~ + FFEO SPAtt CHAtt>> ROTATION 6V 100 'kHz 2rO 270 DEQ SYSTEN COttFIGUttATIOtt NANE 8088 1N ~ of CHAN 8 6t00t46 Att ttARCH I>>4 1939 ~ I JII ~ I I I J I FLFztT IttI I T 'I 'G LEQ DATE ELN 95r0 D.C. CGOt: PEVOOI I II IttLET 04~24~39 6 F< t>>>>y>> JEZ>>tt .>>z>>4 >>Jt>>tt tt CH tt I I'EPT+( (H 6 VERT CttAttttEL tiO '0 11 ROW (t>>>>t>> "'l ll FLAY 8 COL ~ FF.EO !PAtt ROTAT10tt - 200 kHz 5T 5 DEG ~1/ LEFT STRIP CHART (ttAtt>> - 1-5tt IV / CHAIIS 'FAtl FOTAT IOt I 245 Ir DFG PIGHT STPIP CHART CHAtt>> 6V FRED 100 IH- >>PAtt - 270 A TH >> h.h POTATIOI 220 DEG STI'STEN IXktFIC4IRAZIOt t>>4tE 6068111 >> ot CHAtt- 3

t00t46 Atl tVPCH 24 14>>9

,; ~ I' FLAttT ttt IlT SiG LEG DATE ELt'95TO O.C. CO% FEYOBI 1 'll IILET 04>24>>39 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 'FA< I -- - I(0 IH-FOTATIOI 125 CEG LEFT :TRIP (HAFT (N<4<! N IV ~PSJ6 - 1-5 !PAH 15 ROTA'TIOt< - 245 CEG F.IGH'T STPIP CHAPT FFEO )PAH (<<A<I~ AV 100 EH 2TO ROTAT lOI 270 DEG TH A SYSTEN CO<PI(4<RATIO<I 0<'4<E BOPB I t< ~ 0< (HE<- 0 EIOO<46 AII /~ ~ I'F4ICH 24 I?i? I) ) I ), ~ C I ) FL)4<T IF I I T "!0 LEG CATE ELI. 2?STO 0 C COW REVOBI I II it<LET 04!24&? (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 FGTAT III 245 CEG I PIGHT STPIP CHART I 'I l ) F=EG (")4<4 - 100 kH= BV ATH Ai 0 L~ FOTAT10<I S'")TEII <w'<E - CONF IGURAT IOII 506BIH 2TO GEG + <)) (t))4< 0 . <00<40 ))N $~ ~ I>FCH 24 I'; 5 ~ 0 ~ ~

7. I F LA<IT IS<I '1 G LEO CATE ELK 2?5TO O.C. CO(e'EV&II II IIEET 04!24~ BS 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