ML20154B889

Slide Presentation Entitled, Performance of L Grade Stainless Steel Recirculation Outlet Safe Ends at Peach Bottom-3. List of Attendees Encl

ML20154B889
Person / Time
Site:	Peach Bottom
Issue date:	10/01/1985
From:	GENERAL ELECTRIC CO.
To:
Shared Package
ML20154B876	List: IA-85-798, Responds to FOIA Request for Encls to NRC 851009 Summary of 851001 Meeting W/Util.Forwards Documents Identified in Encl App.Documents Also in Pdr.Portions of Second Document Withheld (Ref FOIA Exemption 4 & 10CFR9.5(a)(4)) ML20154B872 ML20154B889
References
FOIA-85-798 NUDOCS 8603040487
Download: ML20154B889 (61)

Text

. _ -.

PRESENIATION TO U.S. NRC PERFORMANCE OF L GRADE STAINLESS STEEL RECIRCULATION OUTLET SAFE ENDS AT PEACH BOTTOM-3

')

OCTOBER 1, 1985 8603040487 G51226

,e kDROG 98 PDR

['

,)

),

OUTLINE o

EXAMINATION

SUMMARY

o UT EXAMINATION RESULTS FOR OUTLET SAFE ENDS o

LOW CARBON STAINLESS STEEL EXPERIENCE 0

EVALUATION OF PEACH BOTTOM-3 OUTLET SAFE ENDS e

MATERIAL VERIFICATION FABRICATION CONTROLS FABRICATION HISTORY CRACK GROWTH EVALUATION

-- o SUW!ARY l

[.>.,: ',

EXAMINATION

SUMMARY

WELDED STAINLESS STEEL PIPING AND SAFE ENDS PEACH BOTTOM-2 AND -3 0

UNIT 2 (MEETING WITH NRC HELD AUGUST 30, 19814) 126 WELDS INSPECTED o

26 CRACKED (21%)

]

214 L GRADE INSPECTED pyg 0 CRACKED I O

UNIT 3 (MEETING WITH NRC HELD SEPTEMBER

'5, 1985) 131 WELDS INSPECTED 39 CRACKED (30%)

17 L GRADE INSPECTED

%T[ w*l M 3 2 CRACKED (UNDER EVALUATION)

I O

TODAY'S MEETlHG FOCUS OUTLET SAFE END PIPE WELD CRACKING STATUS 5

2 o %b P T' C &Er oT)

., - ~ - -,.

- - - - + - -

-o r

,v.-

---~_

m

.,.,c,I

n

.c PEACH BOTTO'i 3198F

SUMMARY

j'

,-}

INSPECTION STATUS (1985 0UTAGE) 1 0

TOTAL NUMBER OF WELDS 151

~

132 0

TOTAL NUMBER REQUIRING EXAMINATION 125 PIPING WELDS 1983 OVERLAYS 7

131 0

NUMBER OF EXAMS COMPLETE 39 0

TOTAL NUMEER OF NEW CRACK INDICATIONS PIPING 29 10 SAFE END THERMAL SLEEVES REPAIR STATUS

1. OF 1983

1. OF

1. OF

1. CRACKED OVERLAY NEW OPERATE EXAMS JOINTS EXAMS OVERLAY 6 AS-IS REMAINING 2

0 0

23" PlPE/ SAFE END 2 (2) 9*

2 1

28" PIPE 11 (9) 2 6

0 24" RHR 8 (6) 0 0

0 22" HEADER 0

20" RHR 4 (4) 5" 2

2 0

3 1

0 12" RECIRC 4 (4) 0 10 0

12" SAFE END T.S.

10 2"

4" JET PUMP INST. SE 39 7

18 21 1

MAY BE MORE OPERATE AS-IS WHEN FINAL UT DATA IS RECEIVED NO CRAC.K GR(iWTH DETECTED IN 1983 WELD OVERLAYED 10lNTS 1

() = NUMBER OF WELDS IHS! TREATED IN 1983

7 PEACH BOTT0l1 UNIT 3 UT OF RECIRCULATIO!! OUTLET SAFE END TO PIPE IfELD 2BS2 l

PIPE SIDE 100m 75 YNY

- $0l rinin riniill rfit r 1

o D'/H//H/HhH/HHH/HMA U1HHi 7HH/HNII IH/i 0

10 20 30 40 50 60 70 80 90 a

0'

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$/Hb 25 i////////7/)t ff//f///f////1 f////L 4=--

7 50 i

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75 o 100 SAFE END SIDE i

1.

14" LONG-AVERAGE 25%, ilAX 40%, CUSP 60%

I 15" LONG AVERAGE 25%, itAX 50%, CUSP 70%

2.

3.

10t LOHG AVERAGE 25%, (1AX 50-57"

~ ~ ~ ~~ SMART UT AVEPAGE 4.

0" L0llG AVERAGE 15% flax 25%

47" TOTAL LENGTI:

A

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4 9

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+

e 6

NDE OF PEACH BOTTOM 3 RECIRCULATION OUTLET SAFE END TO PIPE WELDS J. P. CLARK a

SEPT 1985 a

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2.

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3.

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4.

4" L0llG-AVERAGE 25% flax 30-387, SMART UT AVERAGE

. y o, ""

39" TOTAL LEllGTil

,.c$

3..

RADIOGRAPHY l*

FABRICA110N RADIOGRAPHS DO SHOW GRINDING ON BOTH SAFE ENUS 0

LOCALIZED HEAVY IN SOME AREAS - T0 INTERMITTENT 360 SPOTTY GRIND 4 LEVEL III's IN AGREEMENT f

2BS2 SHOWS EVIDENCE OF HEAVIER GRINDING THAN 2AS2 AND IT HAS MORE EXTENSIVE CRACKING i

l SOME AREAS WHERE UT SIGNALS HAD BEEN EVALUATED AS INTERMITTENT l

ID GE0 METRY IN 1983 HAS NO ID GE0 METRY - COUNTERBORE AND ROOT WERE REMOVED BY GRINDING THEREFORE CRACK INITIATION MAY BE RELATED TO GRINDING CRACKS WERE PRESENT IN 1983 AND EVALUATED AS GE0 METRY

FABRICATION RADIOGRAPils 0F PEACH BOTTOM UNIT 3 RECIRCULATION OUTLET SAFE END TO PIPE HELD 110, 2AS-2 C0f1POSITE EVALUATION DY 1

PECO LEVEL III 2

GE - DAES0 LEVEL III 1

GE - flEB0 LEVEL III PIPE LONGITUDINAL RT ORIENTATI0ll SEAM (10 90 80 70 60 50 TT 40 30 20 10 0

J msnm qmyT R00'Q g

nn -

m r

PA N b

SOLID TO INTERMITTENT ROOT SOLID ROOT 0

10 20 30 40 50 60 70 80 90 UT ORIENTATION SAFE END e CONCAV11Y OR SUCKBACK HOTES 1.

SOME GRINDING OR IllTERf11TTENT FLAPPERIl!G 3600

@ DEEPER GRINDING 2.

SOME SMALL AREAS OF INCOMPLETE FUSION AT 24.5" (RT ORIEllTATI0fi)

?

I FADRlCATION RADIOGRAPilS 0F PEACil BOTTOM 3 RECIRCULATION OUTLET SAFE END TO PIPE HELD NO 2BS2 COMPOSITE EVALUATION BY 1

PECO LEVEL III 2

GE - DAES0 LEVEL III i

1 GE - IIEB0 LEVEL III i

LONGITUDIgAyg PIPE RT ORIENTATION 90 80 70 60 50 40 30 20 10 0

SLIGHT N

JELD< REPAIR 9

COUNTER e

D R0OT BORE SilALLOH ROOT SOLID

{

• e ROOT l 12-70 80 90 O

10 20 30 40 50 60 1

h' "O "00I UT ORIENTATION SAFE ErlD NOTES 1.

SOME GRINDING INTERMITTENT 3600 DEEPER 2.

SOME MISMATCil 0N PIPE SIDE NEAR SEAM

-l GRINDING 3.

SOME SMALL AREAS OF INCOMPLETE FUSION AT 84" ON SAFE EllD SIDE (RT ORIENTATION)

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UT OF PEACH BOTTOM 3 RECIRCULATION UUTLET SAFE END TO PIPE WELUS 2AS2 & 2BS2 CRACK DETECTION SMAR1 UT - 45* SHEAR WAVE DEIECTED CRACKS ON BOTH SIDES OF BOTH WELDS CRACK SIZING MANUAL UT, REFRACTED LONGITUDINAL WAVES USED TO VERIFY AND SIZE DEEPER AREAS C0NFIRMATI0fl SWRI CONFIRMED ALL INDICATIONS WITH ONLY SLIGHT VARIATIONS IN SIZIflG EXAMINATION AND SIZIllG PERSONilEL ALL PERSONNEL TRAINED AND QUALIFIED AT EPRI UNDER IE83-02 IE8302 REQUIREMENTS WORKED

__m._,_. -,.

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~

SUMMARY

OF UT RESULTS PEACH BOTTOM 3 I

i klRCULATION OUTLET SAFE END TO PIPE WELDS a

1985 EXAMINATION REVEALED CRACKS ON BOTH SIDES OF B0lH W I

WELDS EXAMINED IN 1983 FOUND INDICATIONS WHICH WERE EV 360* INTERMITTENT ID GE0 METRY j

INITI AL FABRICATION RADIOGRAPHS SHOW EVIDENCE OF EXT AREAS OF TOTAL ROOT AND COUNTERBORE REMOVAL - NO ID CURRENT UT PERSONNEL, PROCEDURES AND EQUIPMENT CAPABLE OF DETECTIN AND SIZING IGSCC QUALIFIED IN ACCORDANCE WITH IE83-02 EXAMINATIONS WERE IN ACCORDANCE WITH IE82-03 1983

'st.i.

QUALIFICATION OF PERSONNEL, PROCEDURES a EQUIPMENT IN ACCORDANCE WITH IE83-02 SHOWN TO BE SUllABLE I

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^^ .__,. ~ -~~o 9 l MATERIAL CHEMISTRY VERIFICATION i l ANAMET TEST CERT VERIFICATION

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CARBON 0.019 0.016** CHROMIUM 17.05 17.20*** NICKEL 13.49 13.72*** MOLYBDENUM 2.19 2.19'** SILICON 0.80 0.28 SULFUR 0.020 0.019 PHOSPHORUS 0.031 0.028 MANGANESE 1,67 1,79 0.11 COBALT 0.02 COLUMBIUM 0.33 COPPER 0.005 TITANIUM 0.04 VANADIUM 0.005 BORON 0.60-0.100 NITROGEN BY EMISSION SPECTROSCOPIC METHOD 0.024% BY COMBUSTION METHOD BY X-RAY FLOURESENCE METHOD l i \\ l E

..] PEACH BOTTOM-3 MATERIAL VERIFICATION O BOAT SAMPLE REMOVED FROM 0,D. OF B LOOP OUTLET SAFE END SAMPLE REMOVED AT ABOUT 2 0' CLOCK POSITION SAMPLE WAS 1/8 INCH DEEP x 1 1/4 INCH LONG 1/4 INCH WIDE AND COVERED 316 L AND WELD 0 EVALUATED FOR 5 EPR MICROSTRUCTURE / SENSITIZATION CHEMISTRY HARDNESS se. i i ~ i ~

_pD.m a +.Ap-OVERALL RESULTS ~ 0.D. BOAT SAMPLE EVALUATION O MATERIAL NOT SENSITIZED DUAL SCAN EPR ETCHED MICROSTRUCTURE 0 MICROSTRUCTURE SHOWS NO EVIDENCE OF IMPROPER FABRICATION ANNEALED MODERATE GRAIN SIZE (ASTM 3.5) NORMAL HARDNESS (RB - 71) 0 CHEMISTRY CONFIRMED TO MEET SPECIFICATION 0 YlELD AND ULTIMATE STRENGTHS MEET CODE 33 KS1 YIELD STRENGTH 75 KSI ULTIMATE STRENGTH l l

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PEACH BOTTOM-3 SAFE END FABRICATION 0 ORIGINAL FABRICATION BY B8W INCLUDED FURNACE SENSITIZED (F.S.) 304 SAFE ENDS I UNIT-3 VESSEL SHELL COURSE SUB-ASSEMBLIES SENT TO CB81 FOR COMPLETION l 9 CB&I VESSEL COMPLETION MACHINE TO REMOVE F.S. SAFE ENDS AND ORIGINAL 308 BUTT WELD MATERIAL RE-BUTTER WITH NI-CR-FE ALLOY 182 AND POSTWELD HEAT TREAT (PWHT) PERFORM ADDITIONAL PWHT FOR COMPLETION OF VESSEL SHELL COURSE ASSEMBLY INSTALL NEW LOW CARBON 316 SAFE ENDS l VESSEL AND SAFE END i FABRICATION / PROCESSING APPEARS NORMAL

i: +: PEACH BOTTOM-3 PIPE TO SAFE END WELD INSTALLATION (2-AS-2, 2-BS-2) p 0 THESE ARE CLOSURE WELDS FOR THE 28-INCH DISCHARGE l PIPING INSTALL TEMPLATE TO OBTAIN ORIENTATION l MACHINE SPOOL TO MATCH TEMPLATE (WITH ALLOWANCE FOR WELD SHRINKAGE) i), FIT-UP SP0OL AND START VERTICAL WELD, WATCHING { ALIGNMENT OF HORIZONTAL WELD WHEN ALIGNMENT ACHIEVED, PERFORM HORIZONTAL WELD 0 WELDING PROCEDURE AND INSTALLER BECHTEL OPEN-BUTT TECHNIQUE TYPE 308 ROOT AND OTHER PASSES UNTIL 3/16" THICKNESS TYPE 308 STICK ELECTRODE FOR COMPLETION 1 O _______._m_

PEACH BOTTOM-3 PIPE TO SAFE END WELD RECORDS REVIEW G 2-AS-2 WELDED 4-2-73 THROUGH 4-5-73 FINAL RADIOGRAPH 4-30-73 WELDER "A & B" DREW 40 LBS. OF STICK ELECTR0DE (3/32", 1/8" ONLY) 8 2-BS-2 WELDED 1-22-73 THROUGH 1-27 2 WELDER "A, C, AND D" DREW 40 LBS. OF STICK ELECTRODE (3/32", 1/8", 5/32") RADIOGRAPHED AND REJECTED ONE ZONE 2-8-73 RELEASED FOR REPAIR 2-14-73, WELDER "D" DREW 2 LBS. OF 3/32", 1/8" ELECTRODE tde-REPAIR RADIOGRAPHED AND ACCEPTED 2-16-73 0 WELDING APPEARS NORMAL FIELD PRACTICE 8 2-BS-2 COMPLETED WITH LARGER ELECTRODE, WHICH COULD HAVE INFLUENCED STRESS PATTERN

I F ~ PEACH BOTTOM-3 WELD 2-AS-2 AND 2-BS-2 O FIELD WELD FABRICATION CONSIDERATIONS I CLOSURE WELD JOINT FIT-UP FOR ROOT PASS TYPICALLY WORSE THAN NORMAL WELDS i TYPE 316 MATERIAL ON ONE SIDE COULD HAVE MADE ROOT PASS MORE DIFFICULT TO WELD EASY ACCESS TO PIPE I.D. FROM VESSEL FACILITATES I.D. GRINDING G I.D. GRINDING IN LARGE BORE PIPING COMMON PRACTICE IN OLDER PLANTS 0 RADIOGRAPHIC REVIEW SHOWS EVIDENCE OF EXTENSIVE I.D. GRINDING WELD 2-BS-2 WORSE THAN 2-AS-2 ROOT APPEARANCE (WHERE NOT GROUND FLUSH) IS NOT UNIFORM, CONFIRMING NEED FOR GRINDING TO CLEAN-UP FOR RADIOGRAPHY RADIOGRAPHS CONFIRM EXPECTATIONS AND PIPE INSTALLATION PRACTICES FOR 28-INCH CLOSURE SPOOL WELDS

l l REPORTED CRACKING EVALUATION REQUIRED CONDITIONS e CRACK INITIATION COLD WORKING e WATER CHEMISTRY HISTORY EFFECT ON CRACK GROWTH RATES e APPLIED OPERATIONAL STRESSES e WELD RESIDUAL STRESS EFFECTS ON CRACK PROPAGATION i )

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..y i CRACK GROWTH RATES s e GROWTH RATE BASED ON LIFE TIME WATER CHEMISTRY AT PEACH BOTTOM UNIT 3 FOR 316 L GRADE STAINLESS STEEL e ASSUMED CRACK GROWTH RATE IDENTICAL TO THAT USED IN THE RECIRC INLET SAFE END ASSESSMENT e CONSISTENT WITH LABORATORY DATA AND FIELD EXPERIENCE AT PEACH BOTTOM UNIT 2 l / r em

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=. e 4 WELD RESIDUAL STRESS PARAMETRIC STUDY o CRACK GROWTH IS STRONGLY DEPENDENT ON APPLIED AND WELD RESIDUAL STRESS o LARGE DIAMETER PIPING WELD RESIDUAL STRESS SHOWS WIDESPREAD SCATTER, AND TYPICAL , SINUS 0IDAL SHAPE o VARIATIONS FROM "NRC" CURVE CONSIDERED o ANALYSIS PERFORMED TO DETERMINE WHETHER ATYPICAL RESIDUAL STRESS DISTRIBUTION CAN EXPLAIN REPORTED CRACK DEPTHS - w.

i i ao COMBINED RESULTS OF GE/ANL/SWRI \\, O 5 \\ L .t E \\ l E \\ E \\ \\ 5 \\ , g ~ \\ / \\ -s g -4 0 - k w i> lW] Vih r ~ I q q, -60 1.d. DEP111/THIGNISS o.d. , THROUGH WALL AXIAL WELD RESIDUA 1. STRESS MEASUREMENTS ON 1ARCE DIAMETER FIFES.

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N~ g ] POSSIBLE ROLE OF IHSI o ANALYTICAL STUDIES SHOW BENEFIT OF ~ l IHSI FOR CRACKED PIPES TO** 50% WALL. o ANALYTICAL STUDIES ALSO SHOW HIGH APPLIED STRESSES CAN REDUCE COMPRESSION FOR DEEP CRACKS ) 30% WALL. O PB-3 OPERATEDsc12000 HRS FOLLOWING IHSI + MAXIMUM GROWTH FOLLOWING IHSI ss13% WALL. 1 o NEGATIVE EFFECT OF IHSI AT PB-3 IS PLAUSIBLE BUT NOT CONCLUSIVE. 1 i r l l q-.w,--wg e mvw----o-an em

l i i 70 go REF: TECHNIQUES TO MITIGATE BWR PITE CRACKING IN EXISTING PLANTS (IHSI) l GENERAL ELECTRIC REPORT FOR EPRI NEDC-25146-4 60 ~ W1 = 0 as4 q ( dt = 02 _.=="* a 30 l i 10 3 4 1 g C 1 E ^ i 2 / l / -iO / / -n _ -? 7 i / -30 N UNCRACKgo l % N.%.#/ -40 ,.t de = 0.064 _$g -60 dt = 0.2 -70 We = 0.4 I i.e. g I + 1/4 THICKNESS 1/2 THICKNESS M THICKNESS o d. i M ADIAL posgygog Center Line for Preexisting CracksIHSI Through-Wall A e

I ...-~~m- -{ l REF:IHSI APPLICATION TO THE WELD JUNCTION WITH SMALL CRACKS A. OKAMOTO, H. WADA, T. UNEMOTO AUGUST, 1985, SMIRT POST CONFERENCE ISPRA ITALY l0'0 'i i i i 50 m HD 1HS1 5 S* ^ l, l "f IBS1 4 m 1 s l EO J' 1 } IHs1 4 0.75 Sm c: MM i IHSI s o.5 Sm A> 8 -50 AS IHSI I 1 -100 i i 0% 10% 30% 50% CRACK DEPTH 4 AXIAL STRESS AT THE CRACK TIP. i 4 - <,_ _ _...... _ _ _ _ _ _ _ - - - - + * * - -

4 RECIRCUL ATION OLITLET. N0ZZLE SAFE END CRACKING

SUMMARY

e REPORTED CRACKING IS GREATER THAN EXPECTED e RESILUAL STRESS VARIATIONS COULD CAUSE THE DEEFER CRACKS e WELD OVERLAY RECO.*?2NiiED 4 4.

INLET _ SAFE END CRACK GROWTH ASSESSMENT e INLET SAFE END CRACK GROWTH RATES BASED ON LIFE TIME PEACH BOTTOM UNIT 3 WATER CHEMISTRY DATA. I e CRACK GROWTH ESTIMATE BASED ON BOUNDING PLATEAU CRACK. o MOST UNFAVORABLE RESIDUAL STRESS DISTRIBUTION USED FOR GROWTH PREDICTION. e 360* CIRCUMFERENTIAL CRACK WITH PEAK CRACK DEPTH FOR THE WORST SAFE END ASSUMED. e 2/3 MARGIN APPLIED OVER CODE ALLOWABLE FLAW SIZE. CRACK GROWTH PREDICTIONS FOR INLET SAFE END CONSERVATIVE EVEN CONSIDERING OUTLET SAFE END EXPERIENCE W ~.

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l, .SDMMARY l 0 L-GRADE SS WELDS HIGHLY RESISTANT TO IGSCC, BUT CRACKING CAN INITIATE IN NORMAL STRESSED, CREVICED AND/0R SEVERELY COLD WORKED REGIONS 0 ONCE INITIATED CRACK GROWTH CAN OCCUR IN NON-SENSITIZED SS, BUT GROWTH RATES LOWER THAN SENSITfZED SS 1 WATER CONDUCTIVITY AN IMPORTANT FACTOR i o EXTENT OF CRACKING IN PB-3 OUTLET SAFE ENDS NOT YET FULLY UNDERST0OD VERIFICATION OF CRACKING MODE, I.D.' SURFACE COLD WORK AND CRACK DEPTHS WILL BE OBTAINED BY PLUG SAMPLE O NRC (E 83-02 UT QUALIFICATION REQUIREMENTS UTILIZED FOR PB SAFE END EXAMS ARE SUITABLE FOR DETECTING AND SIZING IGSCC

. 7.g

SUMMARY

(CONT'D) o EVALUATION OF PB-3 INLET SAFE ENDS FOR 18 MONTHS OPERATION REMAINS CONSERVATIVE o FABRICATION AND INSTALLATION CONTROLS TO LIMIT COLD WORK OF ALL WELDED SS MATERIAL REQUIRED TO ASSURE HIGH RESISTANCE TO IGSCC BEING UTILIZED FOR PIPE REPLACEMENTS E o PB-3 OUTLET SAFE END CRACKING OCCURRENCE CONSISTENT WITH " LEAK-BEFORE-BREAK" REQUIREMENTS OUTLET SAFE ENDS WILL BE OVERLAYED PB-3 ACCEPTABLE FOR 18 MONTHS OPERATION

m Philadelphia Electric Company ccw/ enclosure (s): Eugene J. Bradley _ Regional Radiation Representative Philadelphia Electric Company Assistant General Counsel EPA Region III 2301 Market Street Curtis Building (Simih'EJoor) Philadelphia, Pennsylvania 19101 6th and Walnut Strests Philadelphia, Pennsylvania 19106 Troy B. Conner, Jr. 1747 Pennsylvania Avenue, N.W. M.' J. Cooney, Superintendent Washington, D. C. 20006 Generation Division - Nuclear Philadelphia Electric Company 2301 Market Street Philadelphia, Pennsylvania 19101 Mr. Edward G. Bauer, Jr. Thomas A. Doming, Esq. Vice President and General Counsel Assistant Attorney General Philadelphia Electric Company Department of Natural Resources 2301 Market Street Annapolis, Maryland 21401 Philadelphia, Pennsylvania 19101 - Philadelphia Electric Company ATTN: Mr. R. Fleishmann Peach Bottom Atomic Power Station Mr. R. A. Heiss, Coordinator Delta, Pennsylvania 17314 Pennsylvania State Clearinghouse Governor's Office of State Planning Albert R. Steel Chairman and Development Board of Supervisors P. O. Box 1323 l Peach Bottom Township Harrisburg, Pennsylvania 17120 R. D. #1 Delta, Pennsylvania 17314 lier 5 J. Williams U.S. Nuclear Regulatory Commission Thomas M. Gerusky, Director i Office of Inspec~ tion and Enforcement Bureau of Radiation Protection Peach Bottom Atomic Power Station Pennsylvania Department of l P. O. Box 399 Environmental Resources Delta, Pennsylvania 17314 P. O. Box 2063 l Harrisburg, Pennsylvania 17120 Hr. Thomas E. Murley, Regt.onal f.dministrator U. S. Nuclear Regulatory Commission, Region I Office of Inspection and Enforcement 631 Park Avenue King of Prussia, Pennsv1vania 19406 l t i f I I i

5 j. s ENCLOSURE I ATTENDANCE LIST FOR OCTOBER 1, IC85 MEETING RE: PEACH BOTTOM UNIT 3 SAFE END CRACKING Name Affiliation R. A. Hermann NRR/DL E. Kiss GE E. C. Kistner PECo W. M. Alden PECo R. H. Zong PECo S. Ranganath GE, San Jose J. Kass GE G. C. Lainas NRR/DL W. S. Hazelton NRR/DE A. Taboada NRR/DE W. Johnston NRR/DE G. Gears NRR/DL D. B. Vassallo NRR/DL A. W. Dromerick IE/EGCB .o R. J. Taminga CECO W. Koo NRR/DE C. Y. Cheng NRR/DE J. P. Clark GE D. W. Diefeuderfer GE E. F. Reczek GE R. M. Horn GE M. R. Hum NRR/DE S. Lee NRR/DE T. C. Hinkle PECo J. F. O'Rourke PECo T. L. Chapman GE K. J. Wilson PECo A. P. Bazzani PECo R. L. Lebre GE S. F. Klapproth GE V. Benaroya NRR/DE J. Wiggins NRC/ Reg I S. Reynolds NRC/ Reg I l l l l 1 / _}}