ML19309C359

Nonproprietary Version of NRC 791211 Presentation, Eight by Eight Fuel Failure Investigation.

ML19309C359
Person / Time
Site:	Vermont Yankee
Issue date:	12/11/1979
From:	VERMONT YANKEE NUCLEAR POWER CORP.
To:
Shared Package
ML19309C354	List: ML19309C353 ML19309C359
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

l

.. FULL POWER SJAE OFFGAS vCI/SEC

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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 ,

. 31 4 mM socATi ,,

$ 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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1 l

COMPANY PROPRIETARY i

g uw tocattow (cowcw tacattow u m Au. nr ucm:wTs>

y i

Q up tacAftes (trTT11 DtDICAfts TIF MCalWr) y l .

. $ lam tacATION 31 l 4 := lacAni=

82 i

• sons Enos u u

" 1 LEAKERS ~17.7 GWD/MT 8

@]l b rW qin $11/79 . .,

ir a o

[JIjl}i[m.U)]s t- . - -

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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 .

1 z

' 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

1. 7 i r 141,4-

1. 6 i e- 121.3" -

1. 5 i i- 1 01 .1 "

a

1. 4 I i ,81 .0" COMPANY PROPRIETARY

1. 3 I i- 60.8"

1. 2 I i- 40.7" re i- 20.5" SPACERS l#1 ,

j j".

i LOWER TIE PLATE _

sui //

HWT 12/11/79

• l l

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

,i L_ _.

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

i i

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

W:.. -

t.~

p '

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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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v + r e--- -w n --- w -v , -

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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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b COMPANY PROPRIETARY 9

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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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A R N M Y O P

N R T O

P Y R A I

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T K A E R E Y

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7

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GENERAL ELECTR;C CO.

U .

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

-m

, HWT

~

12/11/79 s

f I

l . -

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..

y .

w E

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

,.r.

_ ._. ...m _ . _ . - _ -- - _ .

F:

p.. _

p g .-

[

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

~i

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

s WEAR SURFACED DURING VERMONT YANKEE LTA INSPECTION,I SPRING

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

[ 12/79 l

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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

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WATER R0D MODIFICATION _

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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

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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

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