ML20205P220
| ML20205P220 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 10/26/1988 |
| From: | Craig Harbuck Office of Nuclear Reactor Regulation |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8811080027 | |
| Download: ML20205P220 (41) | |
Text
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get ,. mf,, UNITED STATES Do&
a NUCLEAR REGULATORY COMMISSION t, a WASHING TON, D. C. 20555 October 26, 1988
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Docket No. 50-313 r
LICENSEE: Arkansas Power & Light Company FACILITY: Arkansas Nuclear One, Unit 1 '
SUBJECT:
SitMPARY OF !!EETING BETWEEN ARKAtlSAS POWER & LIGHT (AP&L)
COMPANY AND THE NRC STAFF, HELD OCTOBER 18, 1988. AT ROCKVILLE, MARYLAND - ARKANSAS NUCLEAR ONE, UNIT 1 (ANO-1)
REACTOR COOLANT PUMP CASING INSERVICE INSPECTION RESULTS The purpose of the meeting was to present the results of the just completed inservice inspection [ISI) of the casings of the A and B reactor coolant pumps (RCPs) to the NRC staff, and to discuss a request for relief from ASME Code requirements for inspecting C and D RCPs.
Included in the presentation was a description of the Babcock and Wilcox (B&W) developed automated ultrasonic testing data acquisitirn and irraging system (ACCUS0htX) which was used by AP&L to perform the ISI of A and B RCPs.
Reportable indications had been found in the upper and lower scroll welds of the B RCP casing by the ACCUSONEX system. Preliminary fracture mechanics analysis of these indications demonstrated the components were safe to operate without repair. AP&L believed the indications were fabrication flaws such as slag inclusion, because they were specular in nature and were subsurface; service induced flaws, it was argued, would most likely begin on the inner surface, not internal to the component. Interpretation of the ASME Code would :
rew ISI of either C or D RCP casing prior to startup from the current refueling outage.
The NR'C staff stated that relief from the ASME Code requirement for ISI on C and D RCPs would be considered provided that (1) the indications found on the B RCP this time and the indications found examined during the next refueling outage, (2)previously on the A RCP single wall radiographic are examina-tion is performed on a RCP casing whenever a pump is disassembled, allowing such examination, and (3) the ACCUS0! LEX test data for the B RCP casing examination i., satisfactorily reviewed by the NRC staff.
8811080027 881026 DR ADOCK 05000313 PNU I7)[
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l AP&L stated that first two conditions would be included in the formal relief request submittal. Arrangements for the third condition were to be made the following week.
Copies of the viewgraphs presented during the meeting and a list of attendees are enclosed.
ISl C. Craig Harbuck, Project flanager Project Directorate - IV Division of Reactor Projects - Ill, IV, V and Special Projects
Enclosure:
As stated cc w/ enclosure:
See next page
_DJSTRI BilTI0ll I,0cket File f!RC PDR Local PDR PD4 Reading J. Calvo C. liarbuck OCC-Rockville E. Jordan D. Grires B. Hermann C. Y. Chen ACRS (10) g T. itartin (Region IV)
PD4 Plant File PD4/Pli/6// PD4/D mig CHarbuck:sr JCalvo 10/;c/E8 10/J4/ 88
s, 4 2-AP&L stated that first two conditions would be included in the formal relief request submittal. Arrangements for the third condition were to be made the following week.
Copies of.the viewgraphs presented during the meeting and a list of attendees are endosed.
[ dk.
C. Craig Harbuck, Project Manager Project Directorate - IV Division of Reactor Projects - III, IV, Y and Special Projects
Enclosure:
As stated cc w/ enclosure:
See next page -
9
[ Mr. Dan R. Howard, Manager ,
Licensing Arkansas Nuclear One P. O. Box 608 Russellville, Arkansas 72801 Mr. -James M. Levine, Executive Director Nuclear Operations Arkansas Nuclear One P. O. Box 608 Russellville, Arkansas 72801 Nr. Nicholas S. Reynolds Bishop, Cook, Purcell & Reynolds 1400 L Street, N.W.
Washington, D.C. 20005-3502 Mr. Robert B. Borsum Babcock & Wilecx -
Nuclear Power Generation Division 1700 Rockville Pike, Suite 525 Rockville, Paryland 2085?
Resident Inspector U.S. Nuclear Regulatory Cocrnission 1 Nuclear Plant Road Russellville, Arkansas 72801 Regional Ac'ministrator, Region IV U.S. fluelear Regulatory Cocinission Office of Executive Director for Operations 611 Ryan Plaza Drive, Suite 1000 Arlington, Texas 76011 Honorable William Abernathy County Judge cf Pope County Pope County Courthouse Russellville, Arkansas 72801 Ms. Greta Dicus, Director Division of Environmental Health Protection Arkansas Departr,ent of Health 4815 West Markan Street Little Rock, Arkansas 72201
et 4 n-Enclosure 1 ATTENDEES Name Organization Title Dale E. Janes AP&L Licensing Supervisor Rick Lane AP&L _ Engineering Manager Sandy McGregor AF&L Engineering Services Supt.
John Shepard B&W Supervisory Engineer Mike Hacker B&W Supervisor, UT Technology Ray Reamey. AP&L Welding /NDE Engineer Bob Hermann NRC Chief /ISISection(MEB)
C. Y. Cheng NRC Chief / Material Eng. Branch (PEB)
C. Craig Harbuck NRC Project Manager _AP 01
- c. m ENCLOSURE 2 l l
ANU-1 RCP PUMP CASING EXAMINATION INTRODUCTION DALE JAMES RCPINSPECTIONNISTORY RICK LANE ENHANCED INSPECTION TECHNIQUES SAtIDY MCGREGOR 1R8 EXAMINATION RESULTS SANDY MCGREGOR FRACTURE MECHANICS / STRESS ANALYSTS Ev4LuArran. JOHN SHEPHERD EXEMPTION P.EQUEST RICK LANE
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lEND VIEW OF
- f PROBLEMS ASSOCIATED WITH UT OF CSS o LARGE GRAIN SIZES PRODUCE "NOISE" SIGNALS WHICH MUST BE' DISTINGUISHED FROM REAL FLAW SIGNALS o POOR SIGNAL-TO-NOISE RATIOS o SOUND BEAM SKEWING, SPLITTING, DISTORTION l
o DIFFICULT INSPECTION GEOMETRIES e
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' BABCOCK & WILCOX CAST STAINLESS STEEL (CSS) l UT TECHNOLOGY STATUS l 1
BACKGROUND o 1985/1986 - B&W DEVELOPED ACCUSONEX (AUTOMATED UT DATA ACQUISITION AND IMAGING SYSTEM) o MID 1987 -- B&W INITIATED AN R&D PROGRAM TO IMPROVE UT OF CSS -
o MARCH 1988 -- B&W DEMONSTRATES ADVANCED UT TECHNOLOGY ON AP&L RCP CASING TEST BLOCKS
- o JUNE 1988 -- B&W DEMONSTRATES ADVANCED UT TECHNOLOGY ON WOG CSS TEST BLOCKS IN ROUND ROBIN AT EPRI NDE CENTER 1
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o SEPTEMBER / OCTOBER 1988 -- B&W APPLIES ADVANCED UT TECHNOLOGY TO RCP-A AND B AT l ANO-1 -
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TECHNOLOGY DESCRIPTION l
ACCUSONEX - DATA ACQUISITION
.o BASED ON HP 3b0 NERIES COMPUTER SYSTEM ;
o DIGITIZES DATA FROM UT SYSTEM o RECORDS TRANSDUCER COORDINATES FROM SCANNER 1
o DATA STORED ON HIGH DENSITY MAGNETIC TAPE !
FOR OFF-LINE ANALYSIS AND PERMANENT STORAGE l
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(2 DATA ACQUISITION SYSTEM CONFIGURATION LECROY TRumen h AUTOMATED h M TE SCANNER RECORDER CONTROLLER SCM m -
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TECHNOLOGY DESCRIPTION ACCUSONEX- ANALYSIS SYSTEM o PRESENTS 3 SIMULTANEOUS VIEWS ON COLOR CRT .
-- TOP VIEW (X-Y)
-- SIDE VIEW (X-Z)
-- EN D VIEW (Y-Z) i o COLOR USED FOR AMPLITUDE DISCRIMINATION l
o ZOOM FEATURE FOR COORDINATE AND AMPLITUDE ;
VARIABLES l l o GRAPHIC AND TABULAR PRINTOUTS AVAILABLE r I
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tr ENHANCED FLAW DETECTION TECHNIQUES o IMPROVED SIGNAL RESPONSE LONGITUDINAL WAVES USED TO IMPROVE PENETRATION OF SOUND BEAM FOCUSED TI9ANSDUCERS USED TO MAXIMlZE AMPLITUDE RESPONSE TRANSDUCER SIZE, FREQUENCY, AND DAMPING ARE OPTIMlZED o ACTUAL COMPONENT USED TO DETERMINE SCANNING SENSITIVITY o DIGITAL SIGNAL PROCESSING i AVERAGING AND FILTERING NOT VERY EFFECTIVE B&W DEVELOPED ALGORITHM CALLED "LOWER BOUND TARGET MOTION FILTERING" (LBTMF) IS MOST EFFECTIVE 4
LBTMF PROCESSES DATA TO LOOK FOR REFLECTORS WITH THE DESIRED TARGET !
1 MOTION i
- - MATERIAL "NOISE" MINIMlZED
- REAL INDICATIONS ENHANCED i
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- l6 RESULTS OF MARCH 1988 DEMONSTRATION ON AP&L RCP TEST BLOCKS o FLAWS WERE LOCATED IN SCROLL AND TORUS !
WELDS o ALL IMPLANTED FLAWS IN TEST BLOCKS WERE DETECTED AND IMAGED o UT LENGTH MEASUREMENTS WERE GREATER THAN ACTUAL LENGTH DUE TO BEAM SPREAD FOCUSED 0 DEGREE IMPROVES ACCURACY -
o UT THROUGH-WALL MEASUREMENTS ARE OVERESTIMATED FOR SMALL REFLECTORS 1/16" SDH,1.9" DEEP RESULTS IN UT MEASUREMENT OF .714" 0.080" (THROUGH-WALL) SLAG INCLUSIONS 1.5" DEEP IN RCP TEST BLOCK RESULT UT MEASUREMENT OF .85" AND .53" 0.100" (THROUGH-WALL) SLAG INCLUSION 1.5" DEEP IN RCP TEST BLOCK RESULTS IN UT MEASUREMENT OF 1.12" o B&W SELECTED AS VENDOR FOR THE INSPECTION OF ANO-1 RCP CASING WELDS u -
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Detection and False Call Performance on CSS Materlat
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18' RESULTS OF EPRl/WOG CSS WORKSHOP - JUNE 1988 o GOAL BENCHMARK STATUS OF CURRENT CSS UT TECHNOLOGY UTILITY VENDOR SELECTION o 9 TEAMS PARTICIPATED 5 MANUAL 4 AUTOMATED o 7 TEST SPECIMENS WERE USED FOR TESTING ON MANUAL TECHNIQUES o 7 DIFFERENT TEST SPECIMENS USED FOR TESTING j ON AUTOMATED TECHNIQUES l o TEST SPECIMENS REPRESENTED A CROSS-SECTION OF MATERIAL COMBINATIONS, GRAIN SIZES, AND JOINT CONFIGURATIONS USED IN PLANTS -
I o FLAWS WERE THERMAL AND MECHANICAL FATIGUE CRACKS, a -
li CAST S A NLESS GRAD hG STATISTICS I
CRACK 1 2 r ,A 3 4 5 6 4 / GRADING C ,
C C C C l UNITS i
1 2 3 4 CD = NUMBER OF CRACKED UNITS MARKED 'C' TOTAL NUMBER OF CRACKED UNITS EXAMPLE:
CD = 2 = 50%
4 FC = NUMBER OF BLANK UNITS MARKED "C'
! TOTAL NUMBER OF BLANK UNITS EXAMPLE:
FC = 3 = 50%
6
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p Improved Rellability Cast Stainless P. eel 3iping Examinations Ultrasonic eramination of cast staiah . wl (CSS) Westingbouse Owners Group (WOG)in June 1987 piping is .auclear power plants it a difE nspection ACCUSONEX achieved the higbest Daw detection rate pecblem. Industry data presented by the Eleeric Power and lowest false call rate of c.ll participants, as shown in Rucerch Icstitute (EPRI) in hne 1988 showed that Fipre 1.He reliability of B&W's pipicg ersmmations such examinations provide no better than approxi- can help utilities make more informed decisions about mately a 55 percent crack detection rate and produce piping conditions and can help them defeat, enmina-significant false calls. Babcock & Wacox has developed tion results to licensing authorities.
. an improved UT erammation system for CSS piping weld joints using its ACCUSONEX'" data acquisition improved Transducer Design and and imaging system.
Signal Processing The ACCUSONEX sptem outperformed all other participating automated systems and manual inspection Ur cummation of CSS materials hu been wnsi-teams in a series of tests sponsored by EPRI nd the dered extremely difUcult tue to reacction/atter.iation of the UT energy during wave propaga: ion. Inte ference with the transmission of the ultrasound occur' because Performance Resutts for Cast Stainless Steel Examinstons of the large grain structure that is inherent widi CSS.
at EPRl/WOG Workshop June 1988 B&W's A CCUSONEX system includes a special sig-nal processicsspability that greatly improves the relia-
,_ bility of CSS piping enminations. Re ACCUSONEX auma,e ree.ece w+o.
sptem digitizes the UT data from the UT instrument, 7* records time and amplitude of all sigrals that exceed the
" ' . ! * preset threshold, and records the r.pdicable scanner
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caum gosition coordinates at the time the rignal exceeded the l 2 e - e.=-. threshold. Data are stored on a high density magnetic l
l _p gy[uyd tape for analysis and as a permrsent record of the g, _ , u.w.i ut mspecuon. One of the system's anslysts features ts the
.s ability to select the X and Y axis and the thi:kness #the
$ L's'a8 section for display. A top view, side view and end siew 20
- u"'1 of the selected section are displayed for analysis. Color is used for amplitude discrimination, o ' ' ' ' ' ' ' ' ' ' B&W's inspectie'n syt:em includes the following fu.
tures to improve the transducer design and signal pro-
. rame can ace no. un cessing so that Osw detection is enhanced.
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- Longitudinal waves rather than shear waves improve material penetration Using the ACCUSOST.X data acquisition and kn.ging systein,
. aw ourperformd the other piping hupnen teams as a w ork.
- Focused transducers minimize the material area shop sponsored by LPRt/WOG. The ACCUSONT.X syness's from which background renections occur and max-signal processing capab4ity aDows mor, occurite detection of imize response from actual rt0+xtors CSS piping cracks si c.swi. The neceptabb whiow of perfoe-anance noted on the gs.% was based on EPRI test gukieknes.
- Digital processing for image .tnalpis L' -
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O A BAW developed Gltering process called lower
, , Bound Target Motion Filtering mininuzes indica-saw's Performance on Cast Stenkss Steel Examinations tions thtt aren't real and enhanos Etual indica- at EPRt/WOG Workshop. June 1988 tions. !! allows the data analyst to detect Gaw signals even when the peak signal ampliffde does not too -
exceed the noise levet Proven Results a -
At an NDE workshop sponsored by EPRI/WOG, 70 h
B&W demonstrated its automatal exaaunation tech- p so -
nique on seven test specunens. De technique used a {g _
dual-element,45' re'racted-longitudinal wave focused y 'O transducer. A cross-section of material grain sizes and weld joint conSgurations were used. Figure 2 illustrates so - '**C*
the results of the automated test for cach test specunen. n .
Crack detsetion rates using ACCUSONEX were con- -
sistently high; and the false call rates were quite low with only two of the seven points above 10 percent. o, ,', ,', , ' , ,', ,', , ' , -
Why B&W? 5'""'"
B&W is committed to developing new technology to %2 help utilities fraprove plant reliabilit*, and efficiency.
uw's '--- A team wWeted coedmeetly Wah erwk Piping examinations using ACCUSONEX arejust one deseedos rese and low falm caN rum unne the ACCUSC;iT.X example of our many innovative products and senices. dass wguidden and innslag syme a esamem Css W.
FOR MORE INFOPMATION, CONTACT: aa w assee omens Sooton.b4A Howeton, 7X Manager, Electncal Engineenng totr) sae-ass 4 tris)ero ease 8&W Nuclear Power Division Caer$one.NC Portw4 om 3110 Odd Fellows Road tr**)334-474a toast sas-ease Caen t.ynchburg, Virginia 24501 (804) 447 3753
,Qu sen, rji c3,c.,,, n, g43,3 p ,,,,,,
or (31r)risteet St Peterseurs.FL Your Nearest B&W Sales Office o*ae*' (ets) asa-4 sat (Lese.ood). Co rses)seeeaea
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0 STRESSES IN REGIONS OF FLAWS (BOTH WELDS)
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AND FAULTED CONDITIONS :
O FROM TABULATED STRESSES, MAXIMUM MEMBRANE STRESS AND MAXIMUM BENDING :
l STRESS SELECTED FOR EACH SERVICE
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1 MECHANICS EVALUATION !
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LIFE OF COMPONENT
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p MAXIMUM MEMBRANE AND BENDING STRESSES.
(ENCOMPASSES BOTH WELDS)
MEMBRANE BENDING STRESS STRESS (KSI) (KSI)
DESIGN CONDITION 10.6 3.0 NORMAL / UPSET CONDITION EXTREME "A" -
11.7 25.2
+ 0 OUTSIDE EXTREME "B" -
4.8 14.1
+ 9 INSIDE EMERGENCY CONDITION 10.8 3.5 FAULTED CONDITION 13.4 12.9 t
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i RESULTS OF FRACTURE MECHANICS EVALUATION !
i 1
O FOR NORMAL AND UPSET CONDITIONS (INITIAL l FLAW SIZE) 1 UPPER. WELD: KI = 27.8 KSI IN L0WER WELD: KI = 39.8 KSI IN !
O FATIGUE FLAW GROWTH ANALYSIS BASED ON i KI AND INITIAL FLAW SIZE FOR FLAW IN !
LOWER WELD ,
0 ASSESSMENT OF MARGINS NORMAL AND UPSET CONDITIONS KIC/KI = 179/42.1 = 4.3 > 3.16
^
EMERGENCY AND FAULTED CONDITIONS i KIC/KI = 179/35.2 = 5.1 > 1.414 j l
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___ O
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p
- o EIEMPTION REQUEST
- RELIEF SOUGitT
- tASIS FOR RELI U REQUEST i
i
- JUSTIFICATICIls FOR RELIU 9
I ii -