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
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8X8 FUEL FAILURE INVESTIGATION j
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PURPOSE: REVIEW OF INVESTIGATION OF THE VERMONT YANKEE 8X8 FUEL FAILURES BY ACCELERATED CORROSION
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SCOPE:
REVIEW:
e SITE OBSERVATIONS MAJOR INVESTIGATIVE. ACTIVITIES
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SITE OBSERVATIONS
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e 0FFGAS HISTORY
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VERMONT YANKEE 8X8 OPERATIONAL , HISTORY
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i FUEL BUNDLES LEAKER CYCLE l TYPE RELOAD INCORE BUNDLES 3 7X7R 1 40 8X8 2 328 4 7X7R 1 40
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8X8 2 192 8X8 3 136 5 7X7R 1 40
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8X8 2 108 ,
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6A 7X7R 1 24 8X8 2 36 =
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LEAKER LOCATIONS FOR VERMONT YANKEE CYClF IA.-
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COMPANY PROPRIETARY
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CYCLE 5
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VERMONT YANKEE SITE INSPECTIONS i
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COMPANY PROPRIETARY
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e VISUAL e SITE INSPECTIONS e POST E0C-5 0UTAGE (NOVEMBER 1978)
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COMPANY PROPRIETARY
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FUEL RETRIEVAL FOR HOT CELL EXAM
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e POST E0C-6A OUTAGE (APRIL 1979)
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CRUD SAMPLING
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VERMONT YANKEE FUEL INSPECTION 8 X 8 LATTICE , I
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VERMONT YANKEE E0C 5 SITE INSPECTION RESULTS
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VER110NT YANKEE FUEL INSPECTION
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R0D FAILURE LOCATIONS E0C 5
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8 X 8 FUEL BUNDLE , ,
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CONFIGURATION """h i s0-UPPER TIE PLATE
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SPACERS l#1 ,
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VERMONT YANKEE FUEL R0D RETRIEVAL FOR
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HOT CELL EXAM
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E0C 5 2
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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)
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12/11/79
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VERMONT YANKEE
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, E0C 6A SITE INSPECTION RESULTS
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e COMPANY PROPRIETARY e
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VERMONT YANKEE. FUEL INSPECTION-R0D FAILURE LOCATIONS
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VERMONT YANKEE i
E0C 6B INSPECTION RESULTS
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e SELECTED RODS IN 3 SOUND BUNDLES e
COMPANY PROPRIETARY e
CRUD SAMPLES FROM SELECTED Go AND U0 2 RODS
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VERMONT YANKEE SITE INSPECTION
SUMMARY
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e COMPANY PROPRIETARY
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e OTHER VEPEONT YANKEE 8X8 RELOADS
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e RELOAD 2 - PROBLEM NOT OBSERVED, o RELOAD 4 - PROBLEM NOT OBSERVED
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e OTHER ACTIVITIES e CRUD SAMPLING i
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VERMONT YANKEE
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MANUFACTURING REVIEW ACTIVITIES
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e DETAILED RECORD SEARCH (NOVEMBER 1978 FIELD DATA)
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e PRODUCTION STEPS
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e TIME OF FABRICATION e POTENTIAL OUT-0F-SPECIFICATION CONDITIONS
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e STATISTICAL COMPARISONS e SOURCE MATERIAL
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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
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e COMPANY PROPRIETARY s RECORD SEARCH RESULTS e FAILURES DID NOT CORRELATE WITH:
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VERMONT YANKEE RELOAD 3
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VERMONT YANKEE RELOAD 3 1
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VERMONT YANKEE MANUFACTURING REVIEW i
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COMPANY PROPRIETARY
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POTENTIAL CONTAMINATION REVIEW 4
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- e CONIAMINATION REVIEW RESULTS e ~
NO EVIDENCE DEVELOPED TO SUGGEST CONTAMINATION DURING FABRICATION e ANALYSES (AUGER /SIMS)
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COMPARISON OF SPARE RODS TO SIMILAR VINTAGE RODS AND CURRENT PRODUCTION
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COMPANY PROPRIETARY
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VERMONT YANKEE MANUFACTURING REVIEW j l
- SPARE R0D TESTS l
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e 2 RODS FROM DWZO2 e 1 R0D FROM DWZ05 .
e EXAMINATIONS PERFORMED e NJN-DESTRUCTIVE / DESTRUCTIVE EXAMINATIONS
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e COMPANY PROPRIETARY
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PELLETS / CLADDING /END PLUG / FILL GAS
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MANUFACTURING REVIEW
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e NO DEFINITE CORRELATION TO ANY SPECIFIC PARAMETER e ENGINEERING SPECIFICATIONS M'ET
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e COMPANY PROPRIETARY e
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e SPARE RODS
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e NO SIGNIFICANT DEVIATIONS FROM SPECIFICATIONS
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e COMPANY PROPRIETARY ,
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VERMONT YANKEE HOT CELL EXAM
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e FAILURE CHARACTERISTICS e NUCLEAR BENCHMARK e EXAMINATIONS ,
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e NON-DESTRUCTIVE TESTING
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VISUAL
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NEUTROGRAPHY
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PROFILOMETRY
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GAMMA SCAN e
.. COMPANY PROPRIETARY e DESTRUCTIVE EXAM
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LEAK CHECK
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CLADDING ANALYSIS FOR HYDROGEN
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SECONDARY EMISSION MICROSCOPY (SEM)
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METALL0 GRAPHY
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BURNUP ANALYSIS HWT 12/11/79
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NON-DESTRUCTIVE EXAMINATION i-
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PROGRESSIVE CORROSION e NEUTROGRAPHY -
NO CENTRAL VOIDING
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NO MOISTURE IN GETTER
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COMPANY PROPRIETARY e PROFILOMETF.Y -
NO CLAD RIDGING
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COMPANY PROPRIETARY
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e GAMMA SCAN -
NO MAJOR AXIAL BURNUP DISCONTINUITIES e COMPANY PROPRIETARY NNI
.12/11/79
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VERMONT YANKEE DESTRUCTIVE EXAMINATION j
e LEAK CHECK
- CLAD, WELD, END Pi.UG INTEGRITY e CLAD ANALYSIS -
SECONDARY HYDRIDING
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COMPANY PROPRIETARY
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e METALL0 GRAPHY
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NO EVIDENCE OF CENTRAL FUEL VOIDING w
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FUEL MICROSTRUCTURE CONSISTENT WITH PREDICTED POWERS
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COMPANY PROPRIETARY
_
e BURNUP ANALYSES
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GOOD AGREEMENT WITH NUCLEAR .
CALCULATIONS .
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PROPRIETARY INFORMA VERMONT YANKEE WATER CHEMISTRYliEVIEW 5
l :s REVIEW 0F PLANT RECORDS t
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PROPRIETARY INFORMAild tj VERMONT YANKEE
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COMPANY PROPRIETARY e
HWT 12/11/79
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VERMONT YANKEE
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4 COMPANY PROPRIETARY I
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ANALYTICAL EVALUATIONS T
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e PCI e HYDRIDING e THERF.AL/ HYDRAULIC e NUCLEAR -
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VERMONT YANKEE
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5 REVIEW 0F OPERATING DATA e REACTOR POWER HISTORIES S COMPANY PP.0PP.ICTAR/
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e RESULTS e
0 0 COMPANY PROPRIETARY
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COMPANY PROPRIETARY
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VERMONT YANKEE
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PRIMARY HYDRIDE MECHANISM REVIEW
e REVIEW 0F AVAILABLE INFORMATION
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e SPARE R0D RESULTS
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e HOT CELL EXAM .
e HYDRIDE REVIEW RESULTS e
e COMPANY PROPRIETARY e -
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COMPANY PROPRIETARY I
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THERMAL / HYDRAULICS REVIEW ., !
e BOILING TRANSii10N
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COMPANY PROPRIETARY e
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e THEPfiAL/HYDRfdLIC REVIEW RESULTS
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COMPANY PROPRIETARY '
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e NO ABN0PfiAL OPERATING CONDITIONS REPORTED i
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COMPANY PROPRIETARY
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COMPANY PROPRIETARY
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9 HWT 12/11/79
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VERMONT YANKEE NUCLEAR REVIEW
.i t
e NUCLEAR CONSIDERATIONS
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2 e ENRICHMENT e COMPANY PROPRIETARY e BUNDLE POWER HISTORY
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e PREDICTIVE CAPABILITY BENCHMARK e NUCLEAR REVIEW RESULTS e
e COMPANY PROPRIETARY ,
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e COMPANY PROPP.!ETARY
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MAJOR INVESTIGATIONS 2
RESULTS h ~
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e ANALYTICAL EVALUATIONS . I
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COMPANY PROPRIETARY
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e MANUFACTURING e
ENGINEERING SPECIFICATIONS MET e
COMPANY PROPRIETARY e -
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e HOT CELL e
CONFIRMATION OF ANALYTICAL EVALUATIONS e
e COMPANY PROPRIETARY
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HWT 12/11/79
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- FUEL EXPERIENCE
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e OVERALL FUEL PERFORMANCE
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e COMPANY PROPRIETARY e FALL 1975 PRODUCTION FUEL PERFORMANCE
.
9 HWT 12/11/79
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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
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17.2 CUMULATIVE ESTIMATED ROD FAILURE,% 0.0597. 0.003%* 0%*
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- EXCLUDING VERMONT YANKEE RELOAD 3
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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
,.r.
-
_ ._. ...m _ . _ . - _ -- - _ .
F:
p.. _
.
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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
. --
, _- ._. _
,
. .
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. .
.-
-
i
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~
.
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
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,
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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, 70
'
-
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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
.
---
-
~ - ~ _
.-_
. .
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.
,
'
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
- .
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.
RPE GENERAL El.ECTRIC C0.
12/79 EROPR! EURY INFORMATION
~
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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
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1
-
'
4 .
s o FUEL WATER R0D FIV TEST LOOP
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- 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
.
- -
FLOW
-
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UP TO 150% EQUIVALENT VOLUMETRIC FLOW (V,Y,)-
,
i RPE
[ 12/79 l
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FLOW-INDUCED VIBRATION TEST - CONDITIONS '
!
__.
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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
l
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COMPANY PROPRIETARY
_ :
-
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e BUNDLE CONFIGURATIONS TESTED
.
. - LTA
- 8X8 l
- BWR/6
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FLOW-INDUCED VIBRATION TEST - RESULTS __.
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CONFIGURATION PEAK G's a 1007.' FLOW RELATIVE PEAK G's LTA - .
LTA -
8X8R -
coggg3y ppopagg7,yy 8X8R -
.
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COMPANY PROPRIETARY
,
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RPE 12/79
.
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INCORE VIBRATION -
FUEL CHANNEL WEAR 4
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Figure 5-69. Typical Test Cross Section View - Moss landing Facility
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CORE SUPPORT PL ATE DetFERENTIAL PRESSURE (ps.
,
Figure 5-78. Moss Landing Hot Test vibration Summary (Acceleration, 5300F, 1015 psia) t
_
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-
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. . . _
..
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- . . - .~
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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 _
( .i
.
'. 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
.
.e 6
S RPE 12/79
-
_.
-
r
- . . ,
' a.
.
.' "
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
_ . --