ML19309C359
| ML19309C359 | |
| Person / Time | |
|---|---|
| Site: | Vermont Yankee  |
| Issue date: | 12/11/1979 |
| From: | VERMONT YANKEE NUCLEAR POWER CORP. |
| To: | |
| Shared Package | |
| ML19309C354 | List: |
| References | |
| NUDOCS 8004080497 | |
| Download: ML19309C359 (68) | |
Text
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- VERMONT YANKEE 1 8X8 FUEL FAILURE INVESTIGATION j l ,
\
PURPOSE: REVIEW OF INVESTIGATION OF THE VERMONT YANKEE 8X8 FUEL FAILURES BY ACCELERATED CORROSION SCOPE:
REVIEW:
e SITE OBSERVATIONS MAJOR INVESTIGATIVE. ACTIVITIES e
e FUEL EXPERIENCE ,
- HWT 12/11/79 I .
8ociosotG
-- - ~ . ..
9 i .u SITE OBSERVATIONS e 0FFGAS HISTORY e SIPPING RESULTS e SITE INSPECTIONS AND RESULTS HWT 12/11/79 9
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VERMONT YANKEE 8X8 OPERATIONAL , HISTORY i
FUEL BUNDLES LEAKER CYCLE l TYPE RELOAD INCORE BUNDLES 3 7X7R 1 40 8X8 2 328 4 7X7R 1 40 8X8 2 192 8X8 3 136 5 7X7R 1 40 8X8 2 108 ,
8X8 3 136 g 8X8 4 84 5 6A 7X7R 1 24 8X8 2 36 =
8X8 3 128 $
SX8 4 84
. 8X8R 5 96 (36 8X8) 6B 7X7R 1 24 8X8 2 120 8X8 3 44 8X8 4 84 8X8R 5 96 (36 8X8)
O
. HWT 12/11/79
LEAKER LOCATIONS FOR VERMONT YANKEE CYClF IA.-
i COMPANY PROPRIETARY CDs9CW'LOCAT105
- g LFtM 1ACAT105m au Tu(naamn u Q Utp LDCAftDa (L2TTn DIDICATO y 11P MACB1W1)
$ lan LacATION ,
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$ SOLWI taCAT3DE II u
82 LEAKERS $19.5 GWD/MT Hb7 :
Ti) ORB 'iftylf^2.Y@uo 22/11/79 3 rLUllM dubnblJe , . , , , . ,, ,, ,, , , , . . ,
' - . LEAKER LOCATIONS FOR VERMONT YANKEE -
CYCLE 5
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COMPANY PROPRIETARY i
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82 i
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" 1 LEAKERS ~17.7 GWD/MT 8
@]l b rW qin $11/79 . .,
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LEAKER LOCATION FOR
' VERMONT YANKEE CYCLE 6B i
9 COMPANY PROPRIETARY r
( j g 1/ 2 LOCAT10w (tDeew'LOCATICW () ;
FOR All T1P MAChthf 4) ' )
,3 j' j (LETTER INDICAfts Q LPU f1r LDCAT10k MACHINE) 35 e stM LaCAfton A StM W AT10W 23
$ SenltC1 LACATION " -
a n, I a LEAKERS ~24 BIL/MT 7 .
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' J WT i eianunmuuo gjgf7g u h. Il
VERMONT YANKEE SITE INSPECTIONS i
e INSPECTIONMETHODS e NON-DESTRUCTIVE TESTING (NDT)
COMPANY PROPRIETARY e VISUAL e SITE INSPECTIONS e POST E0C-5 0UTAGE (NOVEMBER 1978)
COMPANY PROPRIETARY FUEL RETRIEVAL FOR HOT CELL EXAM e POST E0C-6A OUTAGE (APRIL 1979)
_ COMPANY PROPRIETARY CRUD SAMPLING e E0C-6B OUTAGE (0CTOBER 1979)
- COMPANY PROPRIETARY HWT
- 12/11/79 l
i l
.. l l
VERMONT YANKEE FUEL INSPECTION 8 X 8 LATTICE , I o
A B C DE F G H 1 T T 2 RELOAD 3, 4 (8D274)
GD - l 3 T , g3 T .
l 4 B 5
6 T T 7 Go- Go 8
T T A BC D E FG H 1 T T 2
3 T Go T 4 Go 5
RELOAD 2 (8D219) 6 7 Go- T
. 7 8 T T T = TIE RODS ur 12/11/79 i
- e VERMONT YANKEE E0C 5 SITE INSPECTION RESULTS
.c
. (NOVEMBER 1978) e RELOAD 3 INSPECliON e
COMPANY PROPRIETARY e
e e
e RELOAD 2 INSPECTION e
COMPANY PROPRIETARY HWT
_ 12/11/79
. 9 e
VER110NT YANKEE FUEL INSPECTION R0D FAILURE LOCATIONS E0C 5 a
A B C D
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FAILED RODS HRT 12/11/79
A
- LIFTING BALE 8 X 8 FUEL BUNDLE , ,
CONFIGURATION """h i s0-UPPER TIE PLATE
> PLENUM i
- COM.PRESSION SPRINGS s
- 7 i r 141,4-
- 6 i e- 121.3" -
- 5 i i- 1 01 .1 "
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- 4 I i ,81 .0" COMPANY PROPRIETARY
- 3 I i- 60.8"
- 2 I i- 40.7" re i- 20.5" SPACERS l#1 ,
j j".
i LOWER TIE PLATE _
sui //
HWT 12/11/79
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VERMONT YANKEE FUEL R0D RETRIEVAL FOR HOT CELL EXAM E0C 5 2
l i
~
i l
e CRITERIA 1
e MAXIMIZE INFORMATION -
e SOUND AND FAILED RODS e NUCLEAR BURNUP BENCHMARK e RODS SELECTION e COMPANY PROPRJETARY e PREDOMINATELY SOUND RODS ,
e CASK SHIPMENT TO HOT CELL (MARCH 1979)
HWT.
12/11/79
VERMONT YANKEE
.J
, E0C 6A SITE INSPECTION RESULTS
- (APRIL 1979) e RELOAD 3 INSPECTION e
COMPANY PROPRIETARY e
e CRUD SAMPLING -
e 1 Go ROD, 5 UO2 RODS ,,
i
i HWT l 12/11/79 !
t l
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VERMONT YANKEE FUEL INSPECTION R0D FAILURE LOCATIONS E0C 6A j -
'A B C D E F G H I
T T
2 3
7 T
4 I .
5 6
T T
l 8 _
T T FAILED RODS (SUSPECTS NOT INCLUDED) HWT 12/11/79
VERMONT YANKEE. FUEL INSPECTION-R0D FAILURE LOCATIONS
'i TOTAL -
'A B C D E F G H ,
1 T
T 2
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3 T
T 4
5 T
T 7
8 -
T T .
FAILED RODS Hk7 .
12/11/79 -
~-
C VERMONT YANKEE i E0C 6B INSPECTION RESULTS
.' (OCTOBER 1979) e RELOAD 4 INSPECTION e
SELECTED RODS IN 3 SOUND BUNDLES e
COMPANY PROPRIETARY e
CRUD SAMPLES FROM SELECTED Go AND U0 2 RODS HWT 12/11/79 i
l
VERMONT YANKEE SITE INSPECTION
SUMMARY
e o . RELOAD 3 FUEL INSPECTION e
e COMPANY PROPRIETARY e
l e OTHER VEPEONT YANKEE 8X8 RELOADS e RELOAD 2 - PROBLEM NOT OBSERVED, o RELOAD 4 - PROBLEM NOT OBSERVED e OTHER ACTIVITIES e CRUD SAMPLING i e FUEL RETRIEVAL FOR HOT CELL RWT
- 12/11/79 l l
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MAJOR INVESTIGATIVE ACTIVITIES ,
~
l e MANUFACTURING e HOT CELL e WATER CHEM STRY e ANALYTICAL EVALUATIONS HWT 12/11/79
= -_ - _ _ _
VERMONT YANKEE MANUFACTURING REVIEW ACTIVITIES e DETAILED RECORD SEARCH (NOVEMBER 1978 FIELD DATA) e PRODUCTION STEPS e TIME OF FABRICATION e POTENTIAL OUT-0F-SPECIFICATION CONDITIONS e STATISTICAL COMPARISONS e SOURCE MATERIAL e MANUFACTURING LOTS
- Q e SPARE RCD TESTS ,
r e NON-DESTRUCTIVE / DESTRUCTIVE EXAM e COMPANY PROPRIETARY l
~
HWT ;
12/11/79 l
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VERMONT YANKEE MANUFACTURING REVIEW DETAILED RECORD SEARCH RESULTS e RECORDS FOR FAILED RODS ,
'e FUEL ROD / CLADDING / PELLETS e MATERIAL / PROCESS CHANGES e INSPECTION REPORTS / MATERIAL REVIEW BOARD ACTION e COMPANY PROPRIETARY s RECORD SEARCH RESULTS e FAILURES DID NOT CORRELATE WITH:
~
COMPANY PROPRIETARY e
I HWT 12/11/79
VERMONT YANKEE RELOAD 3 e
COMPANY PROPRIETARY O
no 9
1
4 VERMONT YANKEE RELOAD 3 1
9 i
COMPANY PROPRIETARY 4
e
.HWT 12/11/79
VERMONT YANKEE MANUFACTURING REVIEW i
S e
COMPANY PROPRIETARY Se e
HWT 12/11/79
~
': i s VERMONT YANKEE k}
l 9
POTENTIAL CONTAMINATION REVIEW 4
e : SELECTIVE FAILURE SUGGESTIVE OF POTENTIAL CONTAMINATION
o MANUFACTURING PROCESS REVIEW 1
e ANALYTICAL TESTING -
- e CONIAMINATION REVIEW RESULTS e ~
NO EVIDENCE DEVELOPED TO SUGGEST CONTAMINATION DURING FABRICATION e ANALYSES (AUGER /SIMS)
COMPARISON OF SPARE RODS TO SIMILAR VINTAGE RODS AND CURRENT PRODUCTION 9
COMPANY PROPRIETARY COMPANY PROPRIETARY HWT 12/11/79 m .. _h. m, . . . . , . _- _
C. _ . . _ .c . . - , - .
VERMONT YANKEE MANUFACTURING REVIEW j l
- SPARE R0D TESTS l
, i e AVAILABLE MAN.FACTURED SPARE RODS e 2 RODS FROM DWZO2 e 1 R0D FROM DWZ05 .
e EXAMINATIONS PERFORMED e NJN-DESTRUCTIVE / DESTRUCTIVE EXAMINATIONS e COMPANY PROPRIETARY e EXAMINATION RESULTS ,
e NO SIGNIFICANT DEVIATIONS FROM SPECIFICATIONS PELLETS / CLADDING /END PLUG / FILL GAS o
COMPANY PROPRIETARY HWT 12/11/79
! . . ;
- .-
l VERMONT YANKEE !
l >
MANUFACTURING REVIEW
SUMMARY
j l l e RECORD SEARCH '
e NO DEFINITE CORRELATION TO ANY SPECIFIC PARAMETER e ENGINEERING SPECIFICATIONS M'ET e
COMPANY PROPRIETARY e
e SPARE RODS e NO SIGNIFICANT DEVIATIONS FROM SPECIFICATIONS e COMPANY PROPRIETARY ,
HhT 12/11/79
+ vaso ww. e. , , .,,--s -- - e , ~
VERMONT YANKEE HOT CELL EXAM e FUEL R0D DATA e 12 RODS RETRIEVED e FAILURE CHARACTERISTICS e NUCLEAR BENCHMARK e EXAMINATIONS ,
e NON-DESTRUCTIVE TESTING VISUAL NEUTROGRAPHY PROFILOMETRY GAMMA SCAN e
.. COMPANY PROPRIETARY e DESTRUCTIVE EXAM LEAK CHECK CLADDING ANALYSIS FOR HYDROGEN SECONDARY EMISSION MICROSCOPY (SEM)
METALL0 GRAPHY BURNUP ANALYSIS HWT 12/11/79
w h:
1 VERMONT YANKEE
- .
NON-DESTRUCTIVE EXAMINATION i-e VISUAL -
PROGRESSIVE CORROSION e NEUTROGRAPHY -
NO CENTRAL VOIDING NO MOISTURE IN GETTER COMPANY PROPRIETARY e PROFILOMETF.Y -
NO CLAD RIDGING COMPANY PROPRIETARY e GAMMA SCAN -
NO MAJOR AXIAL BURNUP DISCONTINUITIES e COMPANY PROPRIETARY NNI
.12/11/79 1
VERMONT YANKEE DESTRUCTIVE EXAMINATION j e LEAK CHECK
- CLAD, WELD, END Pi.UG INTEGRITY e CLAD ANALYSIS -
SECONDARY HYDRIDING e SE -
COMPANY PROPRIETARY e METALL0 GRAPHY NO EVIDENCE OF CENTRAL FUEL VOIDING w FUEL MICROSTRUCTURE CONSISTENT WITH PREDICTED POWERS COMPANY PROPRIETARY e BURNUP ANALYSES GOOD AGREEMENT WITH NUCLEAR .
CALCULATIONS .
HWT 12/11/79
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COMPANY PROPRIETARY o
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-GENERAL ELECTR;C CO.
PROPRIETARY INFORMA VERMONT YANKEE WATER CHEMISTRYliEVIEW 5
l :s REVIEW 0F PLANT RECORDS t
- e FUEL WARRANTY REPORTS e OPERATING LOGS / CHEMISTRY DATA e WATER TREATMENT SYSTEM OPERATION e RESULTS OF REVIEW e COMPANY PROPRIETARY e VISUAL / CHEMICAL ANALYSIS OF CRUD, DEPOSITS l
e
- COMPANY PROPRIETARY 6
e HWT 12/11/79 l
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GENERAL ELECTR;C CO.
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PROPRIETARY INFORMAild tj VERMONT YANKEE
- j. WATER CHEMISTRY REVIEW
- e REVIEW 0F PLANT RECORDS e FUEL WARRANTY REPORTS e OPERATING LOGS / CHEMISTRY DATA e WATER TREATMENT SYSTEM OPERATION e RESULTS OF REVIEW e COMPANY PROPRIETARY e VISUAL / CHEMICAL ANALYSIS OF CRUD DEPOSITS e
COMPANY PROPRIETARY e
HWT 12/11/79 9
9
VERMONT YANKEE
' l 100 - CYCLE 3 =l H CYCLE 11 y l= CYCLE 5 H H - CYCLE 6
) 80 -
60 -
4 COMPANY PROPRIETARY I
- fl0 -
I 20 -
p 4-e I i i 1975 1976 1977 1978 1979 IlWT
. 12/11/79 k
~-
5 ANALYTICAL EVALUATIONS T
e PCI e HYDRIDING e THERF.AL/ HYDRAULIC e NUCLEAR -
1
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, HWT
~
12/11/79 s
f I
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VERMONT YANKEE
.4 5 REVIEW 0F OPERATING DATA e REACTOR POWER HISTORIES S COMPANY PP.0PP.ICTAR/
e RESULTS e
0 0 COMPANY PROPRIETARY 8
O COMPANY PROPRIETARY G
12/11/79 u ._ - .._ _
VERMONT YANKEE PRIMARY HYDRIDE MECHANISM REVIEW e REVIEW 0F AVAILABLE INFORMATION e SPARE R0D RESULTS e HOT CELL EXAM .
e HYDRIDE REVIEW RESULTS e
e COMPANY PROPRIETARY e -
e I
l COMPANY PROPRIETARY I
e HWT 12/11/79
. . ;
s- ,
1 I
VERMONT YANKEE- !
THERMAL / HYDRAULICS REVIEW ., !
e BOILING TRANSii10N e !
COMPANY PROPRIETARY e
i e THEPfiAL/HYDRfdLIC REVIEW RESULTS i
e COMPANY PROPRIETARY '
t e
NO ABN0PfiAL OPERATING CONDITIONS REPORTED i
COMPANY PROPRIETARY e
COMPANY PROPRIETARY 9
HWT 12/11/79
VERMONT YANKEE NUCLEAR REVIEW
.i t
e NUCLEAR CONSIDERATIONS 2
e ENRICHMENT e COMPANY PROPRIETARY e BUNDLE POWER HISTORY e PREDICTIVE CAPABILITY BENCHMARK e NUCLEAR REVIEW RESULTS e
e COMPANY PROPRIETARY ,
e e
COMPANY PROPP.!ETARY 9
HWT 12/11/79
c..
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MAJOR INVESTIGATIONS 2
RESULTS h ~
[
e ANALYTICAL EVALUATIONS . I
- l l l e l 1
COMPANY PROPRIETARY e MANUFACTURING e
ENGINEERING SPECIFICATIONS MET e
COMPANY PROPRIETARY e -
e HOT CELL e
CONFIRMATION OF ANALYTICAL EVALUATIONS e
e COMPANY PROPRIETARY
- e HWT 12/11/79
i
- FUEL EXPERIENCE e OVERALL FUEL PERFORMANCE e COMPANY PROPRIETARY e FALL 1975 PRODUCTION FUEL PERFORMANCE 9
HWT 12/11/79 e
O
, -- . _ = - - - - -
i GE BWR/2-4 FUEL l
EXPERIENCE SulfARY FUEL TYPES 7X7R 8X8 8X8R CUMULATIVE FUEL ASSEPILlES LOADED 5828 11121 3424 ASSEF2 LIES Sl??ED AT LEAST ONCE 5828 7599 310 LEAD SIPPED EATCH EXPOSURE, GWD/MT 28.1 25.2 17.2 CUMULATIVE ESTIMATED ROD FAILURE,% 0.0597. 0.003%* 0%*
C
- EXCLUDING VERMONT YANKEE RELOAD 3 HWT i
12/11/79
l IMPROVED FUEL DESIGN PERFORMANCE (AS TESTED) 7X7R FUEL RODS l F
>0 GWD/MT >6.5 GWD/MT >11 GWD/MT >16.5 GWD/MT >22 GWD/MT 41,160 39,200 34,594 27,930 14,847 3WR/2-3 244,412 242,599 230,937 142,002 25,676 i BWR/4-5 285,572 281,799 265,531 169,932 40,523 TOTAL 8X8/8X8R FUEL RCDS
>0 GWD/MT >6.5 GWD/MT >11 GWD/MT >16,5 GWD/MT >22 GWD/MT 3WR/2-3 226,548 222,264 138,852 60,165 13,734 l
3MR/4-5 271,719 260,127 138,600 38,556 3529 TOTAL 498,267 482,391 277,452 98,721 17,263 l
~
EXTENSIVE FUEL EXPERIENCE ~
, TO HIGH EXPOSURES
' . HWT 12/11/79 r
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GAD 0LINIA FUEL DETIGNS i
, e 7X7R DESIGNS e
COMPANY PROPRIETARY e
o INITIAL CORE AND RELOAD FUEL e 8X8 DESIGNS e
COMPANY PROPRIETARY e ,
e INITIAL CORE AND RELOAD FUEL 1
COMPANY PROPRIETARY ;
i HWT 12/11/79
FUEL EXPERIENCE AT HIGHER EXPOSURES 7X7R .
>16.5 GWD/MT >22 GWD/MT BWR/2-3 COMPANY PROPRIETARY BWR/4-5 TOTAL 8X8 .
>16.5 GWD/MT >22 GWD/MT BWR/2-3 COMPANY PROPRIETARY :
BWP/4-5 TOTAL :
t
_ l COMPANY PROPRIETARY , !
- HWT 12/11/79
i
~
BWR/4 PROJECTS l 1975 AUG SEPT OCT NOV A (RELOAD) i i
~
B (RELOAD) i i l
C (RELOAD) I i I) (RELOAD) i i i
1 VERMONT YANKEE R3 i l l E (INITIAL CORE) I i ;
HWT 12/11/79 e
..- e ::- : ___ - _ _ _ _. . . . _ . . - - . . . - - - , - _ . . _ _ _ - ,
PERFORMANCE OF BWR/4 FUEL i
FABRICATED FALL 1975 f EAPOSURE BUNDLES (GWD/MT) 0FFGAS INSPECTION PROJECT 22 LOW PLANNED A 184 B 84 18 LOW ,
120 21 LOW PERFORMED C
80 22 LOW IN PROGRESS C
VY R3 136 18 - 24 VERY HIGH PERFORMED E 408 9 LOW J
FALL 1975 PRODUCTION MAINTAINS GOOD PERFORMANCE EXCEPT VERMONT YANKEE RELOAD 3
. HWT 12/11/79
SITEINSPECTION3 OTHER SITES PROJECT INSPECTION RESULTS A e PLANNED SPRING 1980 C e INSPECTION OF 6 BUNDLES AT $18 GWD/MT (4/79) - PROBLEM NOT OBSERVED l e FOLLOWUP INSPECTION PLANNED SPRING 1980 D e INSPECTION OF UP TO 7 BUNDLES IN PROGRESS WITH LEAD BUNDLES UP T0 s27 GWD/MT EARLY RESULTS DO NOT INDICATE PROBLEM O
FIELD INSPECTIONS CONFIRM 0FFGAS TRENDS i HWT 12/11/79 e ,M"'
4 -
FUEL EXPERIENCE
SUMMARY
~
e EXTENSIVE GOOD EXPERIENCE BASE e 8X8 e COMPANY PROPRIETARY e FUEL FABRICATED DURING FALL,1975 e NO 0FFGAS INDICATION OF WIDESPREAD PROBLEM e INSPECTIONS CONFIRMING NO PROBLEM AT OTHER SITES e 8X8 FUEL IN VERMONT YANKEE e RELOAD 2 GOOD PERFORMANCE e RELOAD 4 GOOD PERFORMANCE -
AT THIS TIME, FIELD DATA INDICATES VERMONT YANKEE RELOAD 3 FAILURES NOT A PROBLEM AT ANY OTHER REACTOR OR ANY OTHER RELOAD
~
HWT 12/11/79
I
~
l
. BWR/2-5 RETROFIT FUEL DESIGN - >
l .
WATER R0D LOWER END PLUG WEAR:
t INFORMATION UPDATE FOR -
VERMONT YANKEE STAFF NRC STAFF DECEPSER 1979 O
9 RPE l?/79
AGENDA i
e FIELD OBSERVATIONS - VERMONT YANKEE e OPERATION WITH IRRADIATED 8X8R FUEL .
i e INVESTIGATI0t! PROGRAM e TEST RESULTS ,
e DESIGN MODIFICATION G
RPE 12/79
~. - . . .. . . . -- --
'~
VERMONT YANKEE'0BSERVATIONS i
e LTA INSPECTI0f' IDENTIFIED WEAR (APRIL 1979)
- i e FOUR BWR/2-5 RETROFIT BUNDLES, ONE ADDITIONAL LTA BUNDLE INSPECTED (SEPTEMBER 1979) e TOTAL OF EIGHT WATER ROD, WATER / SPACER POSITIONING ROD LOWER END PLUGS INSPECTED e ALL THESE END PLUGS SHOW WEAR e TWO 8X8 WATER R0D LOWER END PLUGS (SHORT SHANK) SHOWED NO WEAR (EARLIER INSPECTIONS) .
COMPANY PROPRIETARY e NO FUEL R0D LOWER END PLUG WEAR EVER OBSERVED WEAR OBSERVED FOR . WATER RODS ONLY 1 .
1 RPE 12/79
_ ~ _ -. - -
AVERAGE WEAR VS. EXPOSURE 80 ~
l
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- l I
, 70 l
COMPANY PROPRIETARY 60 t
l -
50 G
m' a
E 40 el 5
2 GJ E ,
E 30 E
20
, i 10 5 to 15 20 25 30 EXPOSURE, IS/D/fti
- .
OPERATIONAL CONSIDERATIONS e MAINTAIN C00LABLE GEOMETRY
- MAINTAIN SPACER POSITIONS e SPACER POSITIONING ASSURED BY WATER / POSITIONING R0D
- FRICTION WITH FUEL RODS, WATER RODS, CHANNEL RESISTS FLOW FORCES e ROTATION SPACER OF MOVEMENT
- PREVENTED WITHOUT WATER / POSITIONIN COMPANY PROPRIETARY e LEAD TEST ASSEMBLIES CONTINUE TO SHOW SATISFACTOR
- NO ROTATION RPE 12/79
~ - ~ _
FUNCTIONAL ASSESSMENT e COMPANY PROPRIETARY bALLPHOTOSSHOWSQUARECORNERS,FLATSIDES e NO ROTATION MARKS OM WATER RODS AT SPACERS e CONCLUDE VIBRATION IS NON-TORSIONAL e ROTATION NOT OBSERVED, NOR EXPECTED
- ROTATIONAL RESISTANCE SIGNIFICANT
- NO INHERENT ROTATIONAL FORCES KNOWN e SPACER MOVEMENT NOT EXPECTED
- COMPANY PROPRIETARY
- FRICTION EXPECTED TO EXCEED LIFT FORCE SPACER POSITIONING NOT AFFECTED RPE GENERAL El.ECTRIC C0.
12/79 EROPR! EURY INFORMATION
~
INVESTIGATION PROGRAM
.i
- 1979 e DETAILED INSPECTIONS AT VERMONT YANKEE, PLANT A (BWP/!D SEPTEMBER 1979 e FURTHER INSPECTIONS OF 8X8 AND 8X8R PLANNED 1979-1980 o SINGLE BUNDLE FLOW-INDUCED VIBRATION LOOP CONSTRUCTED, SEPTEMBER 1979 .
e TESTS RUN ON 8X8R, 8X8 TO INDUCE VIBRATION, DEMONSTRATE EFFICACY OF MODIFICATION CONCEPTS e COMMUNICATIONS MAINTAINED WITH NRC AND CUSTOMERS 9
G RPE 12/79
Q FLOW-INDUCED VIBRATION TESTING l l
i l
\
- e PRIOR TESTING PERFORMED; NO IMPACTING OBSERVED l 1
I COMPANY PROPRIETARY e
e RECENT TESTS EXPLORED MAJOR PARAMETERS AFFECTING VIBRATIONAL BEHAVIOR COMPANY PROPRIETARY e
i RPE 12/79 l
y ,- -
1 4 .
s o FUEL WATER R0D FIV TEST LOOP
- 24" 0.D. TEST VESSEL FULL SCALE - 1 BUNDLE e SIMULATED TOP GUIDE e ACTUAL FUEL SUPPORT CASTING .
e TYPICAL INLET ORIFICE e REMOVABLE WATER ROD TEMPERATURE CONTROLLABLE $70 F---1800 F PRESSURE LOW <50 PSI FLOW i
UP TO 150% EQUIVALENT VOLUMETRIC FLOW (V,Y,)-
i RPE
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i COMPANY PROPRIETARY 9
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FLOW-INDUCED VIBRATION TEST - CONDITIONS '
s FLOW: 0-150-0% OF BWR/4 VOLUMETRIC FLOW
-e TEMPERATURE $70 F-180 F e FUEL BUNDLE HARDWARE
- PRODUCT LINE HARDWARE, MODIFIED WATER R0D l
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COMPANY PROPRIETARY l
e BUNDLE CONFIGURATIONS TESTED
. - LTA
- 8X8 l
- BWR/6
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_ e END PLUG MODIFICATION I 1
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FLOW-INDUCED VIBRATION TEST - RESULTS __.
i CONFIGURATION PEAK G's a 1007.' FLOW RELATIVE PEAK G's LTA - .
LTA -
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COMPANY PROPRIETARY e
G RPE 12/79
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INCORE VIBRATION -
FUEL CHANNEL WEAR 4
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Figure 5-78. Moss Landing Hot Test vibration Summary (Acceleration, 5300F, 1015 psia) t I
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INCORE VIBRATION - FUEL CHANNEL WEAR WEAR VS, ACCELERATI0l LEVEL FRE0, ACCELERATION LEVEL WEAR / SIDE INCORE WITH 1" BYPASS HOLES FUEL WATER R0D .
COMPANY PROPRIETARY INCORE WITH 1" BYPASS H0LES PLUGGED - UNIFORM .
FLOW WATER RCD .
e RPE
- 12/79
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WATER R0D MODIFICATION _
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'. e NEW PRODUCTION CHAtlGED
- IMPROVE DESIGN MAR. GIN e WAiER ROD MODIFICATION ,
COMPANY PROPRIETARY e EQUIVALENT TO 8X8 . LOWER END PLUG e DEM0tlSTRATED FIELD PERFORMANCE o CONFIRMATORY TEST RESULTS e CONSISTENT WITH CHANNEL WEAR TESTS AND FIELD I OBSERVATIONS
.J e IRRADIATED (OPERATING) FUEL PERFORMANCE UNAFFECTED
- NO CHANGE PLANNED
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S RPE 12/79
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SUMMARY
- s WEAR IDENTIFIED ON LTA BUNDLE
- CONFIRMED ON SUBSEQUENT 8X8R, LTA EXAMINATIONS e INTENSIVE FLOW-INDUCED VIBRATION TESTS
- VIBRATION CONFIRMED COMPANY PROPRIETARY e OPERATIONAL CONSEQUENCES EVALUATED
- SPACER POSITIONING NOT AFFECTED
- N0 IMPACT ON OPERATION -
e SURVEILLANCE PROGRAM UNDERWAY e NEW PRODUCT MODIFICATION UNDERWAY
- MARGIN IIPROVEMENT O
9 RPE 12/79
_ . --