ML19309C359

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Nonproprietary Version of NRC 791211 Presentation, Eight by Eight Fuel Failure Investigation
ML19309C359
Person / Time
Site: Vermont Yankee File:NorthStar Vermont Yankee icon.png
Issue date: 12/11/1979
From:
VERMONT YANKEE NUCLEAR POWER CORP.
To:
Shared Package
ML19309C354 List:
References
NUDOCS 8004080497
Download: ML19309C359 (68)
v • d • e


Text

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VERMONT YANKEE 1

8X8 FUEL FAILURE INVESTIGATION j

l

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PURPOSE:

REVIEW OF INVESTIGATION OF THE VERMONT YANKEE 8X8 FUEL FAILURES BY ACCELERATED CORROSION SCOPE:

REVIEW:

e SITE OBSERVATIONS e

MAJOR INVESTIGATIVE. ACTIVITIES e FUEL EXPERIENCE HWT 12/11/79 8ociosotG I

- ~.

.u 9

i SITE OBSERVATIONS e

0FFGAS HISTORY e

SIPPING RESULTS e

SITE INSPECTIONS AND RESULTS HWT 12/11/79 9

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FULL POWER SJAE OFFGAS vCI/SEC

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-n 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 g LFtM 1ACAT105m au Tu(naamn CDs9CW'LOCAT105 u

Q Utp LDCAftDa (L2TTn DIDICATO y

11P MACB1W1)

$ lan LacATION 31 4 mM socATi

$ SOLWI taCAT3DE II u

LEAKERS $19.5 GWD/MT 82 Hb7 Ti) ORB

'iftylf^2.Y@uo 22/11/79 3

rLUllM dubnblJe

LEAKER LOCATIONS FOR VERMONT YANKEE CYCLE 5

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l COMPANY PROPRIETARY i

g uw tocattow (cowcw tacattow u

m Au. nr ucm:wTs>

i Q up tacAftes (trTT11 DtDICAfts y

TIF MCalWr) y l

$ lam tacATION 31 l

4 := lacAni=

sons Enos 82 i

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1 LEAKERS ~17.7 GWD/MT rW

$11/79 8

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[JIjl}i[m.U)]s qin/M-i. i. i. u u o.

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LEAKER LOCATION FOR o.

' VERMONT YANKEE CYCLE 6B i

9 COMPANY PROPRIETARY

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j g 1/ 2 LOCAT10w (tDeew'LOCATICW

)

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()

FOR All T1P MAChthf 4) j' j

(LETTER INDICAfts

,3 Q LPU LDCAT10k f1r MACHINE) 35 e stM LaCAfton A StM W AT10W 23

$ SenltC1 LACATION a

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n, LEAKERS ~24 BIL/MT 1

7 z

J WT i eianunmuuo gjgf7g h.

Il u

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 VERMONT YANKEE FUEL INSPECTION 8 X 8 LATTICE o

A B

C DE F

G H

1 T

T 2

GD -

RELOAD 3, 4 (8D274) 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

E F

1 G

H y

1 1

T i

i 7

3 2

1 1

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5

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1 T

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7 I

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8 i

1 T

T FAILED RODS HRT 12/11/79

A LIFTING BALE 8 X 8 FUEL BUNDLE CONFIGURATION

' """h i s0-UPPER TIE PLATE COM.PRESSION SPRINGS

> PLENUM i

s

  1. 7 i

r 141,4-

  1. 6 i

e-121.3"

  1. 5 i

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  1. 4 I

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,81.0" COMPANY PROPRIETARY

  1. 3 I

i-60.8"

  1. 2 I

i-40.7" re i-20.5" l#1 SPACERS j

i LOWER TIE PLATE j".

sui //

HWT 12/11/79

VERMONT YANKEE FUEL R0D RETRIEVAL FOR HOT CELL EXAM E0C 5 l

2 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 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 TOTAL

'i

'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 -

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~-

VERMONT YANKEE i

E0C 6B INSPECTION RESULTS (OCTOBER 1979) e RELOAD 4 INSPECTION SELECTED RODS IN 3 SOUND BUNDLES e

e COMPANY PROPRIETARY CRUD SAMPLES FROM SELECTED Go AND U0 e

2 RODS HWT 12/11/79 i

l

VERMONT YANKEE SITE INSPECTION

SUMMARY

e o. RELOAD 3 FUEL INSPECTION e

e COMPANY PROPRIETARY e

e OTHER VEPEONT YANKEE 8X8 RELOADS RELOAD 2 - PROBLEM NOT OBSERVED, e

o RELOAD 4 - PROBLEM NOT OBSERVED e

OTHER ACTIVITIES e

CRUD SAMPLING i

e FUEL RETRIEVAL FOR HOT CELL RWT 12/11/79 l

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t.~

tp b

~

MAJOR INVESTIGATIVE ACTIVITIES

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l e

MANUFACTURING e

HOT CELL e

WATER CHEM STRY e

ANALYTICAL EVALUATIONS HWT 12/11/79

=

VERMONT YANKEE MANUFACTURING REVIEW ACTIVITIES DETAILED RECORD SEARCH (NOVEMBER 1978 FIELD DATA) e 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 e

NON-DESTRUCTIVE / DESTRUCTIVE EXAM r

e COMPANY PROPRIETARY

~

HWT 12/11/79 i

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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

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VERMONT YANKEE k}

POTENTIAL CONTAMINATION REVIEW l

9 4

e : SELECTIVE FAILURE SUGGESTIVE OF POTENTIAL CONTAMINATION MANUFACTURING PROCESS REVIEW o

1 e

ANALYTICAL TESTING -

CONIAMINATION REVIEW RESULTS e

NO EVIDENCE DEVELOPED TO SUGGEST CONTAMINATION e

~

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

SPARE R0D TESTS 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 NO SIGNIFICANT DEVIATIONS FROM SPECIFICATIONS e

e COMPANY PROPRIETARY HhT 12/11/79

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vaso ww.

e.

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~

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 COMPANY PROPRIETARY e

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

CLAD, WELD, END Pi.UG INTEGRITY e

LEAK CHECK SECONDARY HYDRIDING e

CLAD ANALYSIS e

SE COMPANY PROPRIETARY e

METALL0 GRAPHY NO EVIDENCE OF CENTRAL FUEL VOIDING w

FUEL MICROSTRUCTURE CONSISTENT WITH PREDICTED POWERS COMPANY PROPRIETARY GOOD AGREEMENT WITH NUCLEAR.

e BURNUP ANALYSES CALCULATIONS HWT 12/11/79

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b COMPANY PROPRIETARY 9

e 4

em 9

9 x

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i e

e i

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l 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 VISUAL / CHEMICAL ANALYSIS OF CRUD, DEPOSITS e

e COMPANY PROPRIETARY 6

e HWT 12/11/79 l

1 l

t ll ll b

CO V

M E

PA R

N M

Y ON P

T RO P

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N E

K TA E

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1

/7 9

b):

D' 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 COMPANY PROPRIETARY 4

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 COMPANY PROPRIETARY 0

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-I VERMONT YANKEE-THERMAL / HYDRAULICS REVIEW e BOILING TRANSii10N e

COMPANY PROPRIETARY e

i e

THEPfiAL/HYDRfdLIC REVIEW RESULTS i

e COMPANY PROPRIETARY '

t NO ABN0PfiAL OPERATING CONDITIONS REPORTED e

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

~

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ANALYTICAL EVALUATIONS I

e

l l

l e

l 1

COMPANY PROPRIETARY e

MANUFACTURING ENGINEERING SPECIFICATIONS MET e

e COMPANY PROPRIETARY e

e HOT CELL CONFIRMATION OF ANALYTICAL EVALUATIONS e

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 l

GE BWR/2-4 FUEL 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) l 7X7R FUEL RODS F

>0 GWD/MT

>6.5 GWD/MT

>11 GWD/MT

>16.5 GWD/MT

>22 GWD/MT 3WR/2-3 41,160 39,200 34,594 27,930 14,847 BWR/4-5 244,412 242,599 230,937 142,002 25,676 i

TOTAL 285,572 281,799 265,531 169,932 40,523 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

C (RELOAD)

I i

I) (RELOAD) i i

i 1

VERMONT YANKEE R3 i

l E (INITIAL CORE)

I i

HWT 12/11/79 e

e ::- :

~ _. _

PERFORMANCE OF BWR/4 FUEL FABRICATED FALL 1975 i

f EAPOSURE PROJECT BUNDLES (GWD/MT) 0FFGAS INSPECTION A

184 22 LOW PLANNED B

84 18 LOW C

120 21 LOW PERFORMED C

80 22 LOW IN PROGRESS 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

,M"'

4 e

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

~

l BWR/2-5 RETROFIT FUEL DESIGN -

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 e LTA INSPECTI0f' IDENTIFIED WEAR (APRIL 1979) i 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

70 COMPANY PROPRIETARY 60 t

l 50 G

m' a

E 40 el5 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 SPACER MOVEMENT PREVENTED WITHOUT WATER / POSITIONIN ROTATION OF COMPANY PROPRIETARY e LEAD TEST ASSEMBLIES CONTINUE TO SHOW SATISFACTOR

- NO ROTATION RPE 12/79

~

~ -

FUNCTIONAL ASSESSMENT COMPANY PROPRIETARY e

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 12/79 GENERAL El.ECTRIC C0.

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 i

\\

e PRIOR TESTING PERFORMED; NO IMPACTING OBSERVED 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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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

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- 8X8

- BWR/6

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FLOW-INDUCED VIBRATION TEST - RESULTS i

CONFIGURATION PEAK G's a 1007.' FLOW RELATIVE PEAK G's LTA -

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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

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WATER R0D MODIFICATION

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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

--

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