Text

Nonproprietary Version of Slides Presented at 830223 Meeting Re Fuel Assembly Degradation
	ML20077K703
Person / Time
Site:	Prairie Island
Issue date:	02/23/1983
From:	Smalley W; NORTHERN STATES POWER CO.
To:	;
Shared Package
ML20077K247	List: ML20077K703;
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	FOIA-83-464 NUDOCS 8303310294
	Download: ML20077K703 (31)
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~ 9 m. FABRICATION FEATURES OF IOP N0ZZLE, GRID AND THIMBL5 IUBE SLEEVES TYPE 304 SS SLEEVES BRAZED TO INCONEL 718 GRID STRAPS AND HEAT TREATED AS PART OF GRID ASSEMBLY 3 RAZED /SQLUTION TREATED AT [ (a,c) AGE HARLENED AT[ 2.' (a.c) / ZIRCALOY THIMBLE TUBES INSERTED INTO GRID SLEEVESs THEN EXPANDED VIA 4-LOBE EULGING TOOL g ~ TOP ENDS OF SS SLEEVES HELI ARC WELDED TO TYPE 304 SS N0ZZLE PLATE l l l \\ l l

0, s HOT CELL EXAMINATIONS FRACTURES EXHIBIT LITTLE DUCTILITY (s10 OF SURFACE) BULGE JOINTS OF % NOMINAL DIMENSIONS (NO FABRICATION ANOMALY) SURFACES SHOW RUST COLORED FLOW PATTERNS ABOVE CRACKS FRACTOGRAPHY (SEM) SHOWS EXTEN3IVE GRAIN BOUNDARY SEPARATION CRACKS APPEAR TO ORIGINATE ON OUTER SURFACE CORROSION PR0' DUCTS ON AND NEAR FRACTURE SURFACES EDX (SEM) INDICATES PARTICLES ON FRACTURE SURFACE HIGH IN SI, ALs CU AND CL CHEMICAL ANALYSIS OF SLEEVE INDICATES NORMAL CONSTITUENTS FOR TYPE 304 SS ADDITIONAL EVIDENCE OF STRESS CORROSION NEAR UPPER END OF SLEEVES AND NO.ZZLE/ SLEEVE WELD AREA e l ,n,-,. -. - -, + - - -,

'i n. INTERPRETATION OF HOT CELL RESULTS BULGE JOINT FRACTURE MODE IS IGSCC IGA AND TGSCC SEEN AWAY FROM BULGE JOINTS SCC RELATED TO RUST COLORED CORROSION PRODUCTS / FLOW PATTERNS SCC PRESENT PRIOR TO 12/16/81 INCIDENT SCC BELIEVED TO HAVE OCCURRED DURING STORAGE IN SFP AFTER DISCHARGE FROM CORE O e 0 6

e O RELEVANT OPERATIONAL / FUEL HANDLING EXPERIENCE IN EXCESS OF 5,000 F/AS IRRADIATED AND DISCHARGED W/0 INCIDENT: s 50 REGIONS W/3 CYCLES > 200 F/AS W/> 36,000 MWD /MTU EXTENSIVE EXPERIENCE W/0 INCIDENT FOR LONG TERM STORAGE FOLLOWED BY HANDLING F/AS: s 2200 > 1 YR 600 > 3 YR s + 160 > 5 YR j l SIGN,IFICANT EXPERIENCE WITH REIRRADIATION W/0 INCIDENT l FOLLOWING LONG TERM STORAGE i STORAGE TIME

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DISCHARGED AFTER ADDITIONAL CYCLE

> 1 YR > 450 > 300 > 3 YR > 250 > 200 f i l

REVIEW OF QC/ TRACEABILITY RECORDS RELATED TO PRAIRIE ISLAt4D FA D-34 SLEEVE MATERIAL - CERTIFIED TEST REPORTS TOP GRID ASSEMBLY - HEAT TREATMENT FURNACE CHARTS BULGE JOINTS - DIMENSIONAL CHECK ON SAMPLES VISUAL INSPECTION SLEEVE /N02ZLE PLATE WELDS - VISUAL INSPECTION MFG OPERATING PROCEDURES / REPORTS DEVIATION NOTICES REPAIRS ROUTE CARDS QC INSPECTION REPORTS d e 5 e c

7 MATRIX OF FUEL ASSEMBLIES EXAMINED AT PRAIRIE ISLAllD AND OTilER PLANTS NO. OF POOL STORAGE TIME LOC. Its POOL SLEEVE LOT BRAZE RUN PLANT REGlott F/AS LONG lt T. Sil0R F CLOSE FAR SAME OTifER SAME OTIIER PI 1 3 X X X X 2 2 X X X X 3 3 X X X X f1 6 X X X X 4 2 X X X X 11 3 X X X X ft(U2) 2 X X X,- X ft(U2) 1 X X X X 5 1 X X X X 5(U2) 1 X X X X 6 2 X X X X A 3 2 X X X 5 1 X X X 6 2 X X X B 1 1 X X X ft 1 X X X 6 1 X X X _ C 1 3 X X X 3 3 X X X 5 2 X X X D 1 5 X X X

f. PRAIRIE ISLAND TOP N0Z LE SEPARATION -VISUAL EXAMINATIONS AT PLANT SITES-AT PRAIRIE ISLAND 26 ADDITIONAL ASSEMBLIES EXAMINED EVIDENCE OF CORROSION ON BULGE JOINTS OF 13 OTHER ASSEMBLIES, PRIMARILY FROM SAME REGION AS D-34 CORROSION NOT RELATED TO SLEEVE LOT, HEAT TREATMENT BATCH, OPERATING HISTORY IN CORE, NOR TO STORAGE LOCATION IN POOL AT OTHER SITES PLANT A (3), PLANT B (5), PLANT C (5), PLANT D (8) NO EVIDENCE OF CORROSION ON BULGE JOINTS AT OTHER PLANTS, INCLUDING THOSE MANUFACTURED IN SAME PERIOD AND CONTAINING SAME SLEEVE LOT AS D-34 SUCCESSFUL HANDLING OF ~5000 FAS AFTER DISCHARGE / STORAGE CONCLUSIONS PROBLEM CONFINED TO THREE REGIONS FROM BOTH UNITS OF PRAIRIE ISLAND FUELS I.E. W/ COMMON FUEL POOL SCC DOES NOT RESULT FROM DESIGN OR MFG ANO,MALY FUEL ASSEMBLIES WITH SAME DESIGN AND SAME SLEEVE LOT SHOWED NO SCC IN OTHER PLANTS l-i i l

f. RELATED INDUSTRY OBSERVATIONS SCC IN SENSITIZED 304 SS BWR PIPE CRACKING - EPRI/ UTILITY BWR OG OCCURS AT WELDED JOINTS JOINTS DEVELOP STRESS AND BECOME SENSITIZED CRACKING OCCllRS AT OPERATING TEMPERATURE STRONGLY SENSITIVE hi:0XYGENATEDENVIRONMENT (0 TOO LOW IN PWRS)' 2 CONTAMINANTS, E.G. CL, IMPORTANT (SMALL IN PRIMARY COOLANT) CRACKS TAKE TIME (SEVERAL YEARS) TO DEVELOP PWR - TMI-l SPENT FUEL PIPING SYSTEM FEATURES IDENTICAL TO ABOVE; EXCEPT DEVELOPED AT POOL TEMPERATURES (s90*F) DEVELOPED IN ~2,300 PPM B ENVIRONf1ENT POOLS WILL TEND TO SATURATE WITH OXYGEN RUST COLORED CORROS10N - FE 0 23 CL, AL, CU ETC, DETECTED ON CRACK SURFACE (AS PRAIRIE ISLAND) PWR CONTAINMENT SPRAY AND SFP PIPING AT ARKANSAS-1, CRYSTAL RIVER-3, SAN ONOFRE-1, SURRY-1 AND 2 CRACKS GENERALLY IN SENSITIZED ZONES NEAR WELDS CHLORIDE AND/OR THIOSULFATE CONTAMINATION SUSPECTED l l l l l

KEY RESULTS OF INVESTIGATION IGSCC IN BULGE JOINTS OF SS SLEEVES EVIDENCE OF-SCC ALSO SEEN AWAY FROM BULGE JOINTS SCC APPARENTLY RELATED TO VISIBLE SURFACE CORROSION PRODUCTS VISUAL EXAM OF OTHER F/AS INDICATES PROBLEM CONFINED TO PRAIRIE ISLAND-NO MATERIAL OR FABRICATION ANOMALIES IN REGION 4 (INCL D-34) e e

i O 4 t' r i l ( l j i i i CONCLUSIONS t FAILURE IN BULGE JOINTS DUE TO IGSCC DURING STORAGE IN POOL t PROBLEM APPEARS TO BE CONFINED TO PRAIRIE ISLAND; IS NOT GENERIC i / l \\

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i t I (a.c.9) 4 i i i l I i 4 i l ~ i I l 1 t i 4 Composite of Photomacrograph and Photomicrographs Illustrating Intergranular Attack of Inner Surface of Sleeve About 0.2 inch below Siceve/ Nozzle Weld Zone

<=mm " + (a.c.:.' a I \\ .\\ t 1 l ? I l l l \\ l mems emme Photomicrographs Illustrating Intergranular Cracks in Typical Sleeve r ---4,e

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FEBRUARY 23.1983. !!RC f4EETI!!G PRESENTATION SY-M. KLEE - flSP I l l l

BACKGROUND AND HISTORY !:uel Assembly D-34 02-16-76 Unloaded from new fuel shipping container, receipt inspected and transfered to new fuel pit location A05 ' 03-18-76 Thimble plugging device PD-70 placed in assembly 03-23-76 Transfered to spent fuel pool location D05 04-13-76 Transfered to Unit l core location J02 during cycle 1-2 core reload Accumulated burnup after cycle 2: 6250 MWD /MTU ~ 03-30-77 Transfered to Unit l core location H04 during l cycle 2-3 core sh'uffle Accumulated burnup after cycle 3: 18,230 MWD /MTU 04-05-78 Transfered to Unit 1 core location 104 during cycle 3-4 core shuffle Accumulated burnup after cycle 4: 29,424 MWD /MTU

04-15-7.9 Transfered to spent fuel pool location J47 during cycle 4-5 core shuffle 12-27-79 Thimble plugging device PD-70 removed from assembly e l l l l

l l I FAILURE AND RECOVERY FUEL ASSEVBLY D-34 12-16-81 Assembly D-34 failed during tranfer to small pool i 01-19-82 D-34 Uprighted ! 01-20-82 Replacement top nozzle installed and assembly stored in small pool location L17 l l 08-24-82 Assembly transfered to large spent fuel location P22 l e l l

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FEBRUARY 23.19P,3 'IPC !1EETI'!G PRESEilTATION BY: L. STERN 6 o G b f

TOP GRID TO N0ZZLE ATTACHMENT /" 71RC THIMELC

l'^i1N W _D.il_L ARCUND

~- ) / ~ i r b \\. I ' TOP N0ZZLE ADAPTOR PLATE q f) STAINLESS STEEL SLEEVE a i h i f - EXPANSION LOBE s' / I TOP GRID i II Il i p 4 V

DESCRIPTION OF LOPAR F/A BULGE JOINT DESIGN MECHANICAL JOINT APPROACH SELECTED FOR ZIRC TUBE-STAINLESS SLEEVE ATTACHMENT (TYPE 304 SS) INITIAL DEVELOPMENT / TESTING 1967-1929 - FORMABILITY - STRENGTH - THERMAL CYCLING - CORROSION PROCESS CONTROL AND INEPECTIsN METHODS DEVELOPED RELEASED FOR PRODUCTION IN 1959 I* ,,--..r

FCLL3W THROUGH EVALUAT:0N WITH 1 CYCLE POINT BEACH SKELETON PIE IN 1973 DEMONSTRATED EXCELLENT PERFORMANCE POINT BEACH SKELETON PIE - SAME DESIGN AS PRAIRIE :SLAND - BURNUP GF 18,C00 MWD /MTU - MECHANICALLY SOUND (F.ILURE LOADS UNIRRADIAlco) - STRUCTURALLY SOL'ND (NO EVIDENCE OF CRACKING) t l l ~ l

FEBRUARY 23, 1991. !!RC !!EETING PRESEllTATION BY: 2 M. W R00 THAM i \\ Is r e i n ~

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/ '4 UNITED STATES [ '~, ' g NUCLEAR REGULATORY COMMISSION E WASHING TON. D. C. 20555 t f '%.. ".. o # f/E. 31 1983 MEMORANDUM FOR: Richard H. Vollmer, Director Division of Engineering, NRR Edward Jordan, Director Division of Emergency Preparedness and Engineering Response, IE FROM: Darrell G. Eisenhut, Director Division of Licensing, NRR
SUBJECT:
FUEL ASSEtBLY DEGRADATION WHILE IN THE SPENT FUEL STORAGE POOL The attached AE0D memorandum describes an event that involved degradation of fuel assemblies while in the Prairie Island spent fuel storage pool. The fuel assemblies apparently degraded via stress corrosion cracking. Degradation of fuel assemblies while in the spent fuel storage pool is new and it contradicts the NRC position on long-term storage of spent fuel assemblies. We believe that this event may represent a potential safety concern and should be evaluated. Previous discussions with the Chemical Engineering Branch indicates a willingness to perform this evaluation. Therefore, we request that the Division of Engineering take the lead on this concern and pursue an appropriate NRR course of action. We are also forwarding a copy of the Office of Inspection and Enforcement for information purposes. If further study indicates that this concern is generic we wil1 pursue issuance of an IE Information Notice. \\ u _..- CL-(. i
.g
k. b.
Va'rrell G. Eisenhut, Director Division of Licensing
Enclosure:
As Stated cc: C. Michelson, AE0D F. Miraglia G. Lainas W. Johnston B. Mills, IE 7 l W. Collins, IE l E. Brown, AE00 l V. Benaroya
p. / l nf
[ $1,
l C. McCracken J / [U
./ C. Berlinger M. Tokar ~/ n [- t G. Holahan D. Pickett Y g}}

ML20077K703

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ML20077K703

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