ML19332B937

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Nonproprietary Info Presented to NRC Re Indian Point Unit 2 Steam Generator Secondary Side Loose Objects.
ML19332B937
Person / Time
Site: Indian Point Entergy icon.png
Issue date: 11/30/1989
From:
WESTINGHOUSE ELECTRIC COMPANY, DIV OF CBS CORP.
To:
Shared Package
ML100331155 List:
References
WCAP-12443, NUDOCS 8911220065
Download: ML19332B937 (14)
v • d • e


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WCAP-12443 1 j i

INDIAN POINT UNIT 2 INFORNATION PRESENTED TO THE NRC f

RELATIVE TO THE INDIAN POINT UNIT 2 STEAM GENERATOR SECONDARY SIDE LOOSE OBJECTS NOVENBER, 1989 WESTINGH0USE CLASS 3 WESTINGHOUSE ELECTRIC CORPORATION NUCLEAR ENERGY SYSTENS P. O. BOX 355 PITTSBURGH, PA 15230-0355 l

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3- WESTINGHOUSE CLASS 3 i

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On Thursday, November 2,1989 a meeting was h61d between Consolidated Edison Company Westinghouse and the NRR staff in One White Flint North Building, Rockville, Nd to discuss the status of the Indian Point Unit 2 steam generators. The overall presentation focussed on the maintenance of -

steam generator tube integrity and the 1989 refueling outage steam >

. generator tube inservice inspection. The meeting agenda included l discussions on:

1. Licensing Activities '
2. Inspection Activities and Results ,
3. Steam Generator Secondary Side Loose Objects Evaluation
4. Steam Generator Tube Wear Calculation The Westinghouse presentation on the steam generator tube wear calculation lis provided herein.

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.W INDIAN POINT UNIT 2 EVALUATION OF

. POTENTIAL FOR TUBE WEAR DUE TO LOOSE OBJECTS i

l i

LOOSE OBJECT TUBE WEAR EVALUATION METHODOLOGY i

e Potential Mechanisms for Tube Degradation J e Tube Excitation Mechanisms e Tube Wear Evaluation Conservatisms I

e Material Wear coefficients .l

  • Archard Wear Equation j j

I

= QUAUFICATION OF VIBRATION AND TUBE WEAR METHODOLOGY I J

h e Tube Vibration Analytical Methods l l: \

e Archard Wear-Equation ]

1

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  • Field-Experiences With Loose Objects j l

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EVALUATION OF INDIAN POINT 2 LOOSE OBJECTS

]

e Loose Objects In General Loose Objects From 1989 Accountability Logs

] e

  • Other Loose Objects Found in 1989 1

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m IDOSE OBJECT TUBE WEAR EVALUA110N METHODOLOGY l u

i POTENTIAL MECHANISMS FOR TUBE DEGRADATION ,

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. FrettingWear

. loose object and tube remain in contact

. tube vibrates relative to loose object I

1 l .. Impact-Sliding Wear L

. loose object and tube occasionally lose contact

. tube vibrates relative to loose object

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l' . fluid: removes loose- material from wear site

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.- ImpactingWithout Sliding i

1 e loose object is lifted away from tube and collides with tube repeatedly l energy imparted to tube causes tube deformation

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4 Ih0SE OBJECT TUBE WEAR EVALUATION METHODOLOGY TUBE EXCITATION MECHANISMS  !

l

. Fluidelastic Excitation l 1

  • 1arge vibration amplitudes

. self-excited vibration mechanism characterized by a critical flow velocity above which vibration amplitudes increase rapidly

  • vibration is sinusoidal and occurs at natural .

i frequency'of the tubes in the fluid

. Turbulence-Induced Excitation a small vibration amplitudes which vary randomly in time and direction e narrow-band random vibration at natural -

frequencies of the tubes in the fluid

. Vortex Shedding

. forced vibration which is significant only when vortex shedding frequency is near tube frequency a excitation is insignificant in tube bundle region e not believed to contribute significantly to

{-- loose object tube wear ,

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.,; _ l LOOSE OBJECT TUBE WEAR EVALUATION METHODOLOGY t TUBE WEAR EVALUATION CONSERVATISMS e 14 cation ofImo:;e Objects ,

e tubesheet region has highest cross flow y velocities and drag forces e tube vibration amplitudes are largest in the span ,

between the tubesheet and first TSP

  • Wear Time Calculations

. loose object considered to wear continuously on one location on the tube

. only the tube is considered to experience wear l

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3a,b,c

. maximum approach and gap velocities for tubesheet region are used regardless'of object's location

. Impacting Without Sliding Calculations

. Upper bound tube deformations estimated based on Westinghouse tube dent experiments

. Deformation due to maximum expected energy imparted to tube during a collision

~.. . _ _ - - - _ _ . _ . . . _. . . _ . . .. . . . _ _ . _ _ _ . _

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7.f LOOSE OBJECTS TUBE WEAR EVALUATION METHODOLOGY MATERIAL WEAR COEFFICIENTS e Wear coefficients relate work rate to wear volume

  • Test programs utilize known tube motions and contact forces to produce a measurable wear volume

. Westinghouse test programs are performed in a range of environments including water and AVT steam 1

l e carbon steel, stainless steel, and Inconal materials have been tested in contact with Inconal tubes e Wear tests performed under constant load sliding

. conditions and impact-sliding conditions t

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ja,b,c e For loose objects of unknown composition, Inconel on Inconel wear coefficients are used for conservatism

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1 LOOSE OBJECT TUBE WEAR EVALUATION METHODOLOGY LARCHARD WEAR EQUATION  ;

1 4

V = KFD l

'V' = volume of ne.terial worn from tha tube K= wear coefficient for two material in contact 1

I F = contact force between tube and object ]

D = total distance-over which contact force-acts-

. -Volume worn from tube is dependent on loose object geometry and orientation with respect to the tube

  • Wear coefficient based on Westinghouse test programs

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C-QUAIJFICATION OF VIBRATION AND TUBE WEAR METHODOLOGY TUBE VIBRATION ANALYTICAL METHODS  ;

e Equations and parameters used to analyze SG tube i vibration behavior are based on results of extensive l experimentation and testing l l ,

e Special purpose computer program incorporates equations and parameters necessary to model tube behavior in secondary side flow field e Frequently utilized by Westinghouse to predict the behavior of SG tubes in both the straight leg and U-band regions for applications such as:

- analysis of cut tubes tube stabilization

- U-bend fatigue analysis

- loose object evaluations 1.

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QUAUFICATION OF VIBRATION AND l u3E WEAR METHOD 01DGY

' ARCHARD WEAR EQUATION 1 i

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  • Provides a straightforward relationship between wear related-parameters used in the interpretation of wear test data
  • - Basis for wear predictions-in conjunction with nonlinear tube vibration model analytical solutions
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3a,b,c,e

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  • I 3a,bo c,e Successful application has been achieved for interaction between SG tubes and:

- tubesupportplates

- anti-vibration bars loose objects 6

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QUAIJFICATION OF VIBRATION AND TUBE WEAR METHODOLDGY 1

FIELD EXPERIENCES WITH LOOSE OBJECTS  ?

e Wald rod

  • plugged tube due to wear scar which formed '

in one operating cycle

  • wear time evaluation indicated that' wear time to minimum allowable wall thickness was on 4 order of one cycle ,
  • Anti-rotation block e tube leak occurred when loose object migrated from feedwater line to tubesheet region

. wear occurred in a_4 month period

. analysis indicated that wear to minimum allowable wall thickness could occur in 3 months

  • Westinghouse experience with loose objects at 33 different plants Number of Loose XsAI Obiect Evaluations 1983 4 1984 5 ,

1985 9 1986 14 1987 7 1988 13 1989 8 Total 60 o No leakage events attributable to known stationary objects in SG's which were returned to service i

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.IE I l CUR- UP-NENT RATED PARTS i i

CONDI- CONDI- CATE- g jij- DESCRIPT10N M LOCATION ,7,j,g,1 Rg GORY 21; VIE 1/8* Dia. a ? Not Leg. B45 C50-CE2 16.1 15.2 1 3/4 a 3/4 a f BLOCK Rot absorved this Inspection 14.4 13.6 2 (Formerly Not Leg, between R35 C17 a R34 C16-17 Tubes)

NALF N00R SHAPED (BJECT 3/8* Dia. a ? Not observed this Inspection 28.9 27.3 2 (Formerly Not Leg. In Annulus beside R26 CS, R27 C10. & R28-29 C11 Tubes).

PLATE 0.25 a 1.5 a ? Not Leg, between R15 C3 & P16 C3 7.7 7.3 1 NACHI E CHIP 7/B' Dia. a ? Not observed this inspection 12.4 11.7 2 (Formerly Cold Leg. Among R40  ;

C67-68 8 841 C66 Tubes).

WIE 1/16* a 1/B' a ? R3B C21 (Not Leg) 2.7 2.5 4-22- DIGIDosE 1* a 3* a 4* Aluminus Wmol8P 33.0 31.2 3 Case (Contains a 9V battery).

!. ILD BADE l' a 1.25*

  • 0.38' WGotAP NOT APPL. NOT APPL. 3 i

Plastic POCE T IWI CHAfBER 0.5* Dia. a 4*. Anninus EmotSP 21.0 1g.8 3 )

LADDER LOCK PIN 1/B' Dia a 8' 1ren WmotEP 3.7 3.5 3 CAE RA EAD 1.25* Dia. a 4.12* Stock in wrapper Annulut 13.1 12.4 3 VIE 1/8* Dia. a 8*-12* Long Setween R42-R43. Tubes, extending into 10.2 9.6 4 Annulus towards shell PIECE OF SAR 3/8* a 3/B* a 4* '

Between R42-43. C31-C33 Tubes 12.6 11.9 1 (ColdLeg)

- PIECE OF KLD RIB 1/8* Dia a 4* In Annulus adjacent to R42-43 (Stuck 2.8 2.6 1' toTubesheet.ColdLeg). i

!- WIRE AROUND FOUR TUBES 1/16' Dia. a ? Not Leg, wrapped around R44 C35-36 2.7 2.5 1 L ELECTRICAL WIRE 1/16' Dia. a 7 Not Leg, between R1 C40-41 Tubes 2.4 2.2 1 1

IE M onsi OBJECT 3/4 x 7/8 a 1/4 Cold Leg. between R45 C53-54 Tubes 6.5 6.1 g l PIfi TAP- 11/32 Max. Dia. Cold Leg, between R22-23 C7 Tubes 2.3 2.2 1 I l

Rim . 1/8* Dia. x 10" Cold Leg. Back in bundle between 20.5 19.4 1 R14-15. C5-6 Tubes

  • - THESE OBJECTS ARE POSTULATED TO SE IR TE INDIAN POINT WIT 2 STEAM GENERATORS AS THEY HAVE NOT BEDI VISUALLY OBSERVED.

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IEL1 11tlN EM II!ElImn) l CM.- W. 'I ENT ORTO PARTS ..

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23- PLATE ' 0.25' a 1.5* a 7 act observed this Inapection 7.7 7.3 2 (Formerly Net. R35 C17) l CTLIBER 0.4* Dia. a l' Not Leg, betwees R35-35 C16 Tubes 13.1 12.3 1 i

(Reported as 0.75* -

' Dia. During Previous '

Outages) . ,

tm 0.25' Dia. a ? not observed this lespecties (Fernerly 5.2 4.9 2 l, Not Leg hetueen 844 C35-35).

24 WIE 1/15' Dia. a ? tot observed this Inspection'(Formerly 2.8 2.6 2 ColdLeg.845C44-45).

t l.- 'IstIDurf!FIED OBJECT l' Ota, a 0.5* Not observed this Inspection (Formerly 5.1 4.8 2 1

(003518LT MAD SLUDGE) ColdLeg.R43-44C58).

THREE (3) Tit WAPS. 0.25' Dia. a 18' tel m olst* - EDT APPL. NOT APPL. 4 .

- Plastic ,

(

M SEING TAPE Various Pieces 151EN0l8P 30T APPL. BOT APPL. 4 SAW PAPER 1* a l' Plect 1811010l81* BOT APPL. EDT APPL. 4 DALO MIER l' Dia. a 7* Long UNEN0l8P 18.5 17.4 3 EASEET MTERIAL (ED Appros. 2* a 1/8* a 8' UNm0681* A0T APPL. NOT APPL. 4 SEAL IFF PLATE ETERIAL)

  • THESE OBJECT 5 AE POSTULATED TO BE IN THE 121AN POINT 1811T 2 STEAM GENEMTDR3 AS TET N4fE NOT BED VISUALLT IB5ERV D .

CATEGORT #1 OBJECTS UNkETRIEVABLE In 1987 OR SEF01E. EMA1 RING IN 5/G III 1989 l

. #2- OBJECTS UNitCTRIEVASLE IN 1987 OR BEF01E. NOT SEDI In 1983

  1. 3- CBJECT5 MI5511tG DR REPORTG LOST IR 1989 Biff NOT (E5ERVED 1 *
  1. 4- NEW OBJECT 5 IN 1989. NOT PilEDICTG FilCM (IC LOCS e,.--,v+km , , , . e y. + , ,,veev,,v-,,,w-w-wr w e r-,,-w m.e r-- e- . , - - - - - . . - - , -
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