ML19332B937

Nonproprietary Info Presented to NRC Re Indian Point Unit 2 Steam Generator Secondary Side Loose Objects

ML19332B937
Person / Time
Site:	Indian Point
Issue date:	11/30/1989
From:	WESTINGHOUSE ELECTRIC COMPANY, DIV OF CBS CORP.
To:
Shared Package
ML100331155	List: ML100331154 ML19332B934 ML19332B937
References
WCAP-12443, NUDOCS 8911220065
Download: ML19332B937 (14)

Text

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i WESTINGHOUSE CLASS 3- ) WCAP-12443 1 j i INDIAN POINT UNIT 2 INFORNATION PRESENTED TO THE NRC RELATIVE TO THE INDIAN POINT UNIT 2 f 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

l aR 3-WESTINGHOUSE CLASS 3 i ) l 1 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. l

. - ~. .j .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 J Potential Mechanisms for Tube Degradation e e Tube Excitation Mechanisms e Tube Wear Evaluation Conservatisms I e Material Wear coefficients .l Archard Wear Equation j j = QUAUFICATION OF VIBRATION AND TUBE WEAR METHODOLOGY J Tube Vibration Analytical Methods h e l: \\ Archard Wear-Equation ] e 1 ~ Field-Experiences With Loose Objects j EVALUATION OF INDIAN POINT 2 LOOSE OBJECTS ] Loose Objects In General e ] 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 ) 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 ![ 1 1. fluid: removes loose-material from wear site l' [ Ja,b,c ImpactingWithout Sliding i loose object is lifted away from tube and e collides with tube repeatedly energy imparted to tube causes tube deformation ~ = p l

p 4 Ih0SE OBJECT TUBE WEAR EVALUATION METHODOLOGY TUBE EXCITATION MECHANISMS l Fluidelastic Excitation 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 small vibration amplitudes which vary randomly a in time and direction narrow-band random vibration at natural e frequencies of the tubes in the fluid Vortex Shedding forced vibration which is significant only when vortex shedding frequency is near tube frequency excitation is insignificant in tube bundle region a not believed to contribute significantly to e {-- loose object tube wear [ ) 3a,b,c a

1 l LOOSE OBJECT TUBE WEAR EVALUATION METHODOLOGY t TUBE WEAR EVALUATION CONSERVATISMS 14 cation ofImo:;e Objects e tubesheet region has highest cross flow e y velocities and drag forces tube vibration amplitudes are largest in the span e 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 [ 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 ~...

\\ 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 carbon steel, stainless steel, and Inconal materials e have been tested in contact with Inconal tubes Wear tests performed under constant load sliding e . conditions and impact-sliding conditions t 1 L [ l 3a,b,c i [ e ja,b,c i ja,b,c For loose objects of unknown composition, e Inconel on Inconel wear coefficients are used for conservatism

'T, f. I = 1 LOOSE OBJECT TUBE WEAR EVALUATION METHODOLOGY LARCHARD WEAR EQUATION 1 4 V = KFD l volume of ne.terial worn from tha tube 'V' = K= wear coefficient for two material in contact I F = contact force between tube and object ] total distance-over which contact force-acts-D = -Volume worn from tube is dependent on loose object geometry and orientation with respect to the tube Wear coefficient based on Westinghouse test programs [ L Ja,b,c i-l [ ja,b,c l. != l

C-QUAIJFICATION OF VIBRATION AND TUBE WEAR METHODOLOGY TUBE VIBRATION ANALYTICAL METHODS Equations and parameters used to analyze SG tube e i vibration behavior are based on results of extensive experimentation and testing l Special purpose computer program incorporates e equations and parameters necessary to model tube behavior in secondary side flow field Frequently utilized by Westinghouse to predict e 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. l

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-l t -) QUAUFICATION OF VIBRATION AND l u3E WEAR METHOD 01DGY ' ARCHARD WEAR EQUATION 1 i (- 3a b,c e a a 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

[ 3a,b,c,e [ 3a,b,c,e I 3a,bo c,e Successful application has been achieved for interaction between SG tubes and: tubesupportplates anti-vibration bars loose objects 6 g -w+ ,we-- 4 w-, >g~- w we e-o~ -ww e-v--e---w-- >--w

1 4 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 tube leak occurred when loose object migrated e 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 No leakage events attributable to known stationary o objects in SG's which were returned to service i

.- - ~ -.. - -. -.. - - -. -. 3, ) .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 BLOCK 3/4 a 3/4 a f 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 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 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.. Caught-COBI-CATE. > i.Eg. MSCRIPils }1g LOGATION IIM.T.lg feRI ~ 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 (003518LT MAD SLUDGE) ColdLeg.R43-44C58). 1 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

1. 2-OBJECTS UNitCTRIEVASLE IN 1987 OR BEF01E. NOT SEDI In 1983
2. 3-CBJECT5 MI5511tG DR REPORTG LOST IR 1989 Biff NOT (E5ERVED 1
3. 4-NEW OBJECT 5 IN 1989. NOT PilEDICTG FilCM (IC LOCS e,.--,v+km e

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