ML20040C061

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Slide Presentation from 760512 Meeting W/Nrc Re Tube Denting at Facilities
ML20040C061
Person / Time
Site: Surry, Turkey Point  
Issue date: 05/12/1976
From:
WESTINGHOUSE ELECTRIC COMPANY, DIV OF CBS CORP.
To:
Shared Package
ML13319A635 List:
References
FOIA-81-313 NS-CE-1081, NUDOCS 8201270223
Download: ML20040C061 (55)
v • d • e


Text

-

1 W/flRC MEETIflG - 5/12/76 PURPOSE 1.

IN ACCORDANCE WITH W COMMITf'ENTS MADE TO NRC IN DECEMBER 1975, PROVIDF PRELIMIflARY INFORMATI0fl REGARDING OBSERVATI0ftS MADE AS A RESULT OF 57F.*

GENERATOR TUBE AND TUBE SUPPORT PLATE SAMPLE REMOVAL AT TURKEY POINT UNIT N0. 4 (FPAL) and SURRY UNIT NO. 2 (VEPCO) DURING THE REFUELING SHUTDOWNS NOU IN PROGRESS.

2.

PROVIDE CURRENT W ASSESSMENT OF THE SAFETY IMPLICATIONS CF 111,ESE PRELIMINARY OBSERVATIONS AND IDENTIFY FURTHER CONFIRMATORY EVALUATIONS TO BE CONDUCTED.

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3.

PROVIDE W ASSESS?1ENT OF Tile CONDITION OF OTHER OPERATING WI STEAM GENERATO BASED UPON EVALUATION OF PAST OPERATING EXPERIENCE AND INSPECTION DATA.

8201270223 810925 U0EL8 313 PDR

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!A S "* ". ".Y 0 " !'E".,!',*.T IC" PP P'!j!:TFD TO :. c. IN.0Vny.).u a. i.:4:ill l 'i s i 1.

REPORTED OBSERVATIONS OFSTEA!! GENERATOR TUlli: " DEN T LNG'? LOCAL L7.LD AT TUBE SUPPORT PLATES.

2.

REPORTED "liOURGLASSING" 0F TUB 1: SUPPORT PLATES AND LEAKAGE OBSERVED AT TURKEY POINT AND SURRY PLANTS - ASSOCIATED WITl! DENTING.

3.

" DENTING PilENOMENON DETECTED ONLY IN STEAI! GENERATORS WilICl! OPERATED FOR A SIGNirICANT ilME ON Ph05 PILATE CllEMISTRY.

4.

NO " DENTING" OR "HOURCLASSDG" DETECTED ON Pl. ANTS WilICl! !! AVE OPERATED ONLY ON AVT OR WillCl! UTILIZED Pl!0SPilATE CONTROL FOR LIMITED TIME PERIOD.

5.

LABORATORY EXAMINATIONS OF " DENTED" TUBE SAMPLES S110WED:

A.

NORMAL MECllANICAL PROPERTIES.

B.

MINIMAL WALL Tl! INNING IN DENTED AREA (4%).

C.

NO EVIDENCE OF STRESS CORROSION CRACKING.

D.

NO GROSS " WORKING" 0F TUHE SURFACE.

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E.

NO SIGNIFICANT REDUCTION IN INTEGRITY / STRENGTH.

F.

GREEN CORROSION DEPOSIT.

6.

POSTULATED MECHANISM FOR TUDE WALL DENTING INVOLVES ACCUMULATION OF CORROSION PRODUCTS IN '10HE/ SUPPORT ANNULUS.

7.

PLANT OPERATION CAN CONTINUE SAFELY WilILE FURTHER EVALUATION AND INVEST-IGATION OF Tile PHENOMENON PROCEEDS.

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e IB UPDATE PROGRESS OF DIAGt40STIC PROGRAMS me

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PLANT COMPARISO:15 RELATIVE F LO*a' LEAKAGE PLANT PO -+AVT INSPECTION DEN' RING HOURGLA AT DENTS 4

LONG-TERM EXPOSURE TO P110SPHATE N\\

\\

SURRY 3 1/75 11/75 EXTENSIVE YES

\\.

SURRY 2 2/75 5/75 EXTENSIVE YES 1\\

TURKEY PT 3 9/74 11/75 EXIENSIVE YES YE.\\

TURKEY PT 4 9/74 4/75 EXTENSIVE YES YES BEZNAU 1 7/74 5/75 NONE NO N

PEZNAU 2 8/74 8/75 MINOR N0

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PT. BEACil 1 11/74 11/75 MINOR NO NO g

PT. BEACH 2 11/74 3/76 MINOR NO No

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GINNA 11/74 2/76 MINOR NO NO ZION 1 3/75 3/76 NONE NO NO LIMITED OR NO EXPOSURE TO Pil0SPHATE PRAIRIE IS. 1 10/74 4/75 NONE NO NO KEWAUNEE 10/74 2/76 NONE NO 10 TAKAllAMA 1 10/74 1/76 NONE NO NO ZION 2 11/74 1/76 NONE RINGHALS 2 11/74

~6/75 NONE NO NO DOEL 1 10/74 2/76 NONE NO STARTUP (1)

PRAIRIE IS. 2 12/74 12/75 NONE NO NO CENKAI 1 1/75 6/75 NONE NO COOK 1 2/75 1

1/76 NONE NO NO CONTINUING P110SPHATE OPERATION ZORITA 6/68(2) 3/76 NONE NO SAN ONOFRL 6/67(2) 4/75 PRESENT.

YES (3)

Ron1NSoh 9/70(2) 10/75 MINOR NO NO (1)

INITIAL STARTUP (WITil AVT)

(2)

INITIAL STARTUP (WITil PO )

4 (3)

CllARACTERIZATION OF DENTh CANNOT BE MADE WITil PRESENT INFORMATION DUE TO PRESENCE OF PRE-OPERATIONAL DENTS WHICH OCCURRED DURING ERECTION PHASE. FURTHER INSPECTION IS PLANNED.

UEST!"GH0'J:: STEf" GE':E:770' !1EnE:T! "

2 r. ;. ; c.

.:n.:.;
- A.

Pan - A 'T Plant; Startup On PO Ccnversion Inspe:ticn Fi ndi r.gs 4

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PLA:iTS STARTI;G WITH AVT - 40 OPERAT10:4 WITH P110SPilATE 12/75 No indicaticrs Prairie Island 2 12/74 0

10/76 Takahama 2 12/74 0

6/75 No indicaits.

Genkai 1 1/75 0

6/76 Tihange 1 2/75 0

4/76 No indicatir.n>

Cook 1 2/75 0

Doel 2 "3 8/75 0

1977 b

Trojan 12/75 0

1977 0

1977 Mihama 3 1/76 PLANTS WITH LIMITED PRIOR PHOSPHATE EXPOSURE Indian Point 2 5/73 21 3/75 4/76 Prairie Island 1 12/73 10 10/74 4/75,3/76 No indications l No indications Kewaunee 3/74 6

10/74 2/76 Takahama 1 3/74 6

10/74 12/75 Slight Thinning Zion 2 3/74 7

11/74 1/75 No indications Ringhals 2 6/74 4

11/74 6/75 No indications E33 8/74 3

10/74 j

2/76 No indications Doel l PLANTS WITil EXTENDED PRIOR PHOSPHATE EXPOSURE Connecticut Yankee 7/67 96 6/75 6/76 l

l Minor cracking Beznau 1 6/69 33 7/74 6/75 l

60 11/74 3/75 Some cracking Ginna 11/69 I

Point Beach 1 11/70 47 10/74 3/75 Cracking Beanau 2 10/71 34 8/74 8/75 g

ontinued thinning C

Mihama 2 4/72 33 11/75 1976 i

P.oint Beach 2 5/72 28 10/74 3/76

! Slight thinning i

Surry 1 7/72 29 1/75 11/75 Continued thinnine Turkey Point 3 10/72 l

23 9/74 12/75

[Somethinning Surry 2 3/73 23 2/75 4/75 Slight thinning Turkey Point 4 6/73 14 9/74 l

5/75 Continued thinning Zion 1 7/73 21 3/75 3/76 No indications

~

PLANTS OPERATOlG ON PHOSPIIATE San Onofre 6/67 98 4/75

. Slight thinning i

Zorita 6/68 90 3/75 Thinning Mihama 1 7/70 48 1976 8/74 Continued thinning Robinson 2 9/70 64 10/75 Moderate thinning a

fnesinnnd i.si n f 11 #1a.

ra., A na e s & a aal i c M aa e

s PRIMARY TO SECONDARY LEAKAGE - DENTING (LEAKS AT DENTED REGIONS AT TSP!S)

PLANT DATE EST. RATE (GPM)

,3 p,

TURKEY PT. 3 2/76 4 0.008 B 1-37, 1 3/76 0.04 b 44-51-6 B 44-55-(2-5)

TURKEY PT. 4 8/75 0.05 9/75 0.08 B 44-56-2 1/76 0.13 C 44-55

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SURnY 1 9/75 0.09 A

2-63-7 0.02 A

2 12/75 ~

  • 3/.76 ND A

3-62-1, 3-63-2 3/76 SMALL C 1-77 4/76 0.45 B 2-47-3 SURRY 2 1/76 0.29 C 1-62, 2 2/76 0.6 C 2 3/76 0.2 C 3-63-3 4/76 ND A 3-63-(7).

t H - Row C - Column Third number (where given) designates the support plate.

Tube support No. I plate is lowest, flo. 6 is top TSP on Turkey Point (44 Series); flo. 7 is top TSP on Surry (51 Series)

O SL"92.Y EDDY CURRE!!T DETECT!O!: CF CE'fT5 AT SilPPORT PLATES Initial PO 4VT MEOi FLOS EC Denting D$te Date Date at Su;oorts Plant Opera tion 7/74 None Beznau 1 6/69 7/74 6/75 Nonc 41nna 11/69 11/74 3/75 11/74 Few 3/75 Yes 4/75 Few Robinson 9/70 10/75 No Change 8/74 Hone Beznau 2 10/71 8/74 8/75 Yes 11/74 None Pt. Beach 2 5/72 11/74 Y

8/75

, es Surry l' 7/72 1/75 11/75 1/75 In Review 11/75 Yes Turkey Pt. 3 10/72 9/74 11/75 9/74 In Review 11/75 Yes Surry 2 3/73 2/75 5/75 h/74 None 5/75 Yes Turkey Pt. 4 6/73 9/74 5/75 8/74

None, 5/75 Yes 10/74 None Prairie Is. I 12/73 10/74 4/75 None 12/75 None Takahama 1 3/74 10/74 Ringhals 6/74 11/74 6/75 6/75 None l

Prairie Is. 2 12/74 All aVT 12/74 1/76 None

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LABORATORY TEST PROGRAMS - DEt1TIrlG . MODEL 80llf!R TESTitiG SET-UP WITil TUBE-TUBE SUPPORT PLATE CONFIGURATION WITH INSTRUMENTATICI-IllITIAL EXPOSURE TO SODIUM Pil0SPilATE CilEMISTRY TO DEVELOP DEPOSITS IN ANNULUS REGI0tl SUBSEQUCflT OPERATI0tl UITH AVT CHEMISTRY MONITOR BOILER TUBE ID FOR DENTING AUTOCLAVE TESTING - HEATED TUBE ELECTRICALLY llEATED I-600 TUBE WITH TUBE SUPPORT C0flFIGURATION IflITIAL EXPOSURE TO SODIUM Pil0SPHATE CHEMISTRY SUBSEQUENT OPERATION WITH AVT CllEMISTRY PLUS CONTAMINANTS DESTRUCTIVE EXAMINATION FOR EVIDENCE OF DErlTING ~ AMPOULE TESTING CARBON STEEL INSERTS IN I-600 TUSING AMPOULES FIfLED WITH TEST 50LliTIONS, E.G. SODIUM PHOSPHATE PLUS METAL PH0SPilATES PLUS COOLING HATER CONTAMINANTS AMP 0ULES EXTERNALLY HEATED MONITOR PROGRESS OF DENTING BY OD MEASUREMENTS AUTOCLAVE TESTING - IS0TilERMAL CORROSI0t! SPECIfiENS SUSPENDED Ill VAPOR & LIQUID WITil C0tlCENTRATED l CONTAMINANTS l CARBON STEEL COLLARS O'N I-600 TUBE SEGMENTS EXPOSED TO Pil0SPilATE AtlD AVT CllEMISTRY TESTING OF CANDIDATE INil!DITORS CilEMICAL PROPERTY TESTS AT OPERATING CONDITIONS EFFECTIVENESS AS CORR 0SI0ft ItlllIDITOR IN C0flTNilflATED SOLUTIONS EFFECTIVENESS TO STOP DEtlTING (WilEtl DEllTED TUDES ARE MADE) l STEAM GENERATOR TUBE SAMPLES CilEMICAL Afl0 PilYSICAL ANALYSIS Atl0 PROPERTIES l STEAM GENERATOR TUBE-TUBE SUPPORT SAMPLES CilEMICAL AND PilYSICAL Af!ALYSIS Af!D PROPERTIES e

II A STEAf! GEliERATOR TUBE SUFPCRT FLATE REMOVAL 1. IDEllTIFYTHEiWOTUBES(T-2Af!DT-3)TOBEREMOVED. 2. APPLY SEALER TO COVER AfiD PROTECT THE TUBE HOLE / TUBE AfiflVLUS AREA. 3. FROM PRIMARY OR SECONDARY SIDE, SEVER ADJACENT TUBES (T-1, T-4, T-5, T-6) TO T-2 and T-3 AB0VE AND BE10W SUPPORT PLATE USIflG FLY CUTTER. 4. TAP Afl0 PULL TUBES T-1, T-4, T-5 AND T-6. 5. USiflG SUPPORT PLATE CUTTING Sail, CUT LIGAftEtlTS BETWEEft ADJACENT TUBES SURROUNDitlG T-2 Afl0 T-3. 6. INSTALL TUBE CLAMP BETWEEN TUBES T-2 Afl0 T-3. 7. USING SAW, CUT LIGAMENTS BETWEEll TUBES T-1, T-4 Afl0 TIIE BAFFLE PLATE 00. 8. FROM SEC0flDARY SIDE, USItlG THE FLY CUTTER, SEVER TUBES T-2 AND T-3 BELOW TUBE SUPPORT PLATE. 9. FROM THE SECONDARY SIDE, REMOVE Tile TUBE SECTION (T-2 AllD T-3) WITH THE SUPPORT PLATE SECTION. 4 e -O l l

l SUPPORT PLATE SECTI0tt e U2APPER TUBES RFMOVED ' SECTI0ilS LOST IriidaRAL LilTH SUPPOR] (SHADED) ~ PLATE SECTI0IP-CUT-LINE \\_ // N. N // I T-1 1 T-2 i l T-3 'j T-4 J.c c l 1 C-1 C-2 C-3 i T-5 T-6 i 7Mn MdMUX' l ii i ) !b b YY / t f J

3

1 C PEL!! UNARY L A30RaiOF' rkAMINAi!0N O! ' t!PPORT PI A11 i

SAMPLE REMOVLil l ROM l~l4 Tensile Properties A small section of the tube support plate was removed from the star shaped section for determination of tensile properties. A miniature 4 tensile specimen having a 1/4" gauge length was machined and tensile tested at room temperature with the direction of loading being in the thru thickness direction of the support plate. A section of virgin tube support plate of the same configuration was also tested to assure that the special specimen geometry would not provide erroneous results. The results summarized in Table I indicated that the properties were essentially equivalent to those specified in ASTM, A-285, Grade C. Specimens were also machined from the la rger section of the tube support plate and the results are summarized in Table II. Again, results indicate normal mechanical properties of the service exposed support plate sample. Sections of ligaments were removed from the star shaped piece of tube support plate for metallographic examination. Preliminary results indicated that the fracture surface was corroded to a degree that made determination of the fracture mode by fractographic examination impo s s ible. Metallographic cross-sections also indicated the presence of a corrosion film on the fracture surface which made precise determination of the original fracture path extremely difficult. The microstructure of the tube support plate appeared normal for this grade of material. Deposit Analysis Deposit analyses are in progress. Preliminary observations indicate a fairly loose and softer deposit on the surface in the circulation hole and a much ha rder, more adherent deposit on the tube hole side of the section. The deposit was la reely magnetite, although there appears to be more chloride contamination on the surface of the tube hole. 4 Detailed analyses on all deposit.- using emission spectroscopy, EDAX, electron microprobe. X-ray diff raction and other analytical techniques are in progress. Summary examination is still continuing and the results described reflect preliminary observatione. The corroded surface of the failed tube support plate ligaments and mic roprobe analyses of deposits on the fracture face indicare that the ligaments had failed prior to the tube / tube support pla te removal ope ration. ,mm m-w -,,-,m--- 7

TABLE I Room Temperature Tensile Properties of Tube Support Plate from Turkey Point Unit 4 * (Star Shaped Tube Support Section) FPL Tube Support Virgin Tube Support

0. 2% Y.S. (ksi) 29 36 UTS (ksi) 42 57 Elon. (%)

24 15 Red in Area (%) 44 15 Strain Rate (in/in/ min) 0.0002 -0.0002 Miniature tensile specimen 1/4" gauge length. Direction of tensile loading normal to surface of plate. 1 3 O 5/17/76

~.. i I k TABLE II l Tensile Properties of Tube Support Plate from Turkey Point Unit 4 (Large Tube Support Plate Section 1" Gauge Length) ASTM Gr. A-285 Tensile Properties FPL Specimen Virgin Plate Grade C

0. 2% Y. S. ksi 38 35 30 min.

UTS kai 64 57 55-65

7. Elon 34 41 2 3 % min. *
7. Red ' Area 50 64 E

05 in/in/ min Specimen diameter (in. ) O.25 0.25 t l l

  • in 8" oc in 2" I

l l I l l l l l l l-5/17/76

Stress-Strain Curvas and Data N Engineering FPL 60 Y' Y

  • 59 x

9:re55, Ksi 40 FPL Virgirt 30 YieldStr,,ysi* 39 35 Ultimaie Str.,Ksi 64 Sr7 20 % Eloncj, 34 41 Rm T l 1" 6 L % Red, Rrea 50 64 do y4 ' Dia,

  • Lower Yrelil Point or o. 2 % 0 6.i o,og ir,g O

P-4 6 8 Jo 12. .f4 18 20 22 24 2 ', 2d 22. 34 y; 15 o O STRAIN % ELONGATION

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SKETCii LHEET ,o.,: a: WESTINGHOUSE EL ECTRIC CORPOR ATIOM ~ Turkey Point - 5/11/76 Velocity thru Tube Support, ft/sec ? I I HOT COLD LEC LEG r 18.4 17.3 13.2 = 17.6 14.3 10.4 t 13.6 12.1 8.58 CONDITIONS Steam Pressure-870 psia 6 Steam Flow -3.~2 X10 1bs/h r ~ i Circulation Ratio - 4.2 - 10.9 9.03 6.91 Mass Flow Rate - 13.44 X 106 lbs/hr Feedwater Temp - 431*F 6.4 7.8 4.2 - 3.3 6.3 3.7 l \\ 1 I I

SEETCH 5i1:27 ,..,:., ~ c.. ~ W E 5 T 164 (.li o tJ L L E l. i C T il l C C O l? i' O h i. T I O ri Turkey Point - 5/11/76 Dynataic vicad thru Tube Support, psi I HM COLD LEG r-0.26 0.26 0.18 0.29 0.22 0.13 ~ ' 0.21 0,19 0.11 0.17 0.19 0.09 CONDITIONS SteamPressure-8f.1 psia Steam Flow -3. 2X10 lbs/hr Circulation Ratio - 4.2 6 Mass Flow Rate - 13.44X10 lbs/hr. 0.09 0.14 0.05 Feedwater Temp - 431*F 0.05 0.16 0.06

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1r l e I s l i a i 'l i i n, j m e.<., - g' r i I b U 'r a % r k& 1 l Na s t l t 4 I i I i I SIDE & END VIEWS OF SUPPORT PLATE FRAGMENTS. ALSO SHOWING TUBE AFIER IMPACTS FROM FRAGMENTS AT 100 ' LEET PER SECOND.

\\ a f.tt::F :-t / N5-CE-10;l CURRENT ACTION PLAN A. Completion of the support plate segment removal operation at Surry (Complete) B. Additional visual observations at Surry 2 and possibly Turkey Point 4 (estimated completion 5/20/76) C. Complete evaluation of the specimens removed from the steam generators and identification of the mechanisms involved (estimated completion 7/20/76) ~ D. Finite element stress analysis of the tube support plate, including the presence of cracks, to assess stress levels and structural integrity (estimated completion 9/15/76) E. Analysis of a postulated steam break accident in combination with the potential of loose metal segments in the generator. Possible adverse effects on tube integrity will be assessed. In addition to analytical treatment, an experimental inves-tigation is also planned (estimated completion 9/15/76) F. Post-LOCA and post-steam break tube integrity under blowdown loads will be reassessed with an assumed degraded condition of the tube support plates (estimated completion 9/15/76) G. Possible abrasion effects of local support plate fractures on tube integrity will be investigated for steam break blowdown. Experimental verification is planned (estimated completion 9/15/76) l l l i I I L .}}

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