ML060730185

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Mid-Inspection Questions with the NRC for Waterford 3 Steam Generators During RF13
ML060730185
Person / Time
Site: Waterford Entergy icon.png
Issue date: 03/31/2006
From: Fields M
Plant Licensing Branch III-2
To: Venable J
Entergy Operations
References
TAC MC6047
Download: ML060730185 (31)
v • d • e


Text

L AF' ,

Mid-Tnspection Questions with the NRC for

1. Discuss atiy trends in the amount of primary to secondary leakage observed in the recmntly comnpicted cycle.

Primary to secondary Icakagc was constant all cycic and rcnaincd Icss than 2 GPI).

Waterford 3 SG Primary to Secondary Leakrate Based on Tritium 5

4 0 3 0 2 0

> NN > 1 > N> N C<, 0 0 0 0 0 0 0 0 0 00 0M O 0 0Q E Y CDC

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cd (D 03 l (.0 (0 3 di (3.0dC3

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CD CC5

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0 C) i M _n C F0- N 0 0 Date

2. I)iscuss
  • hcther any secondary side pressure tests were performed during the outaga and the associated results.

A secondcry side pressure test was not performed.

3. Discuss a my exceptions taken to industry guidelines.

There were no exceptions taken to the l:.PRI guidelincs.

4. For each ;team generator, provide a description of inspections performed including the areas examined and which probe was used. The scope of the inspection and the expansion criteria. Also discuss the extent of the inspections performed in the portion of the tube below the expansion transition region in relation to NRC generic letter 2004-01 and Industry inspection recommendations.

LI~f's Attachment A

-I-

LQ2A1F SG31 and SG32 Scope Probe camniet e.4...i.,. FPtfnt Vvnanninn Rpauirpd

. .v...... . .t .-.. -

Full Length Bobbin Bobbin 100% Full Length No Top of Tubesheet Plus Point 100% *Ilot Leg -3 to - I I No Low Row (I1&2) Plus Point 100% 07H to 07C No Historical Wear Plus Point 20"/'o Random No New Wear (bobbin) Plus Point 100%

20% +21-2 Structure **Yes Freespan Dinvs(:-5V) Plus Point Random No Dented Eggerate;(>2V)Plus Point 100% 4-2/-2 No Dented Dia. Strads Plus Point 20% +31-3 No Over Lxpansions Plus Point 100% .-2/-2 No Loose Parts Plus Point I 20% Surrounding No Bobbin Coil "1 Codes" as required

  • Consistent with C* for Waterford (10.4 inches)
    • 100% Plus Point inspection of all wear Expansion plans in accordance with EPRI - PWR Stcam Gcnerator Inspection Guidelines

-Rev 6.

5. For each area examined, provide a summary of the number of indications Identificed to-date of each degradation mode. For the most significant indicatic ns in each area, provide an estimate of the severity or the Indication.

In particular, address whether tube Integrity was maintained during the previous operating cycle. In addition, discuss whether any location exhibited a degradation mode that had not previously been observed at this location at this unit.

All cracks were screened for in-situ testing. There were no indications that required testing. Therefore all perinnance criteria were met in all areas.

The new area that cracking was identified is as follows:

1. Cracking in the vertical straps (axial) 1 here were 3 axial cracks identified in the vertical straps in the batwings.

Attachment A May 1 WYNF3 Steam Generator Inspection Report (Not Final)

Tubes Inservice prier to WF B7 8 Total Number of -,Virrslv removed from servie 571 484 Repair Candidates frnm RFO13:

Hot Len Ton of Tubeshe AAxial Indicaios (Above TTS) 1 2 Hot Lee Too of Tybosteze' Cir&. Indications IAbove TTS)

  • O Hot L Tube Sheet Axi- I Indications (Vithin Tubeshoet' 5 0 Hot Ltc Tube Sheet Ckrc. Indications (Within Tubesheet) 16 i Tubesheet with Axial an' Circumferental IndIcations 0 0 Suroort Plate With Axial Indications 100 21 SL=oort Plate With Cacumferential Indications 0 0 BatWInas With Axial Indiktion 0 3 Custorrer Derision (NSV or NTE/PTE) 7 20 Hot Lou Vdumetrc Indictions 0 3 Cold Lea Volumetrc Ind cations 5 0 Row1-Row2 U-Bent dilcations 0 Bobbin Percents > 40 2 5 Restricted!Obstructed Tuibes or Unable It Comnle Test 0 Potendiaf Stabilizer Can, ldates Durina RF13 (-3' TTS or Higher 41 Tubes Plunged Durino FF13 Total Tubes Plugged - Fost RFt3 ._
6. Describe repair/plugging plans.

All plugs arc mcchanic3l rolled 1-690 All circumnferenlial cracks from TSH -3 and higher are stabilized All cracks ate removed from service via plugging Current plugging numbers arc:

SG31 = 113 S( 32 - 5(

3 Attachment A

7. Describe in-situ and tube pull plans and results.

Currently there arc no in-situ or tube pull candidates for RF 13

8. Provide the schelule of steam generator related activities during the remainder of the current outage.

We are currcntly ia the repair mode of the inslpction. There arc no additional planned tubes of eddy current inspection left to do. FOSAR results will dictate final decision for z.dditional inspections/ repairs. Completion of Steam Generator work is scheduled to completed by 5/5,'2005

9. Discuss the folloving regarding loose parts:
a. What inspection arc being performed to identify loose parts
  • 100° bobbin (using turbo mix -for vear)
  • 100% IL TTS with plus point
  • SG31 FOSAR at thc top of the tubc-shect annulus and tubelanc.
b. A descrip'ion of loose parts identified and their location within the SG.

Six periphery potential loose parts were identified in SG 31. Attempts to visually inspect the loose part locations (5 new) in 31 Steam Generator are in progresL The significance of the findings in 31 SG will determine the need to FCISAR SG 32 which identified only 2 potential loose parts on the periphery.

c. If the loose parts were removed from the steam generator.

FOSAR is in progress in SG31.

d. Indications of tube damage associated with the loose parts.

Only one identified (PLP) potential loose part has caused wear. The loose part was identified on EICT inspection of tube 128-130 (SG32 approxima tely 10 inches above the hot leg TIS).

The loose part associated with indication called on SG 32 IlL in tube 128-130 will nat be removed in RF13. Baring additional information driving FOSAR irspection of SG32, nor attempting to remove the potential part is acceptable based on the following:

4 Attachment A Attachment A

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questions for NRC on SG Inspection at Waterford 3 Why did you not inspect the cold leg tubeshect if you were C-3 in the previous inspection per section 3.4.1?

Based on section 3.4.1 in the EPRI examination guidelines, it is stated that "For temperature-sensitive degradation mechanisms (for example, primary water stress corrosion cracking [PWSCC], intergranular stress corrosion cracking),

examinations may be limited to hot leg locations) that is expansion transitions, dings, dents, sleeves, until a C-3 result is encountered. The determination of the need to examine the cold leg fro temperature sensitive degradation mechanisms shall be bas;ed on the results of the degradation assessment and operational assessment. But as a minimum, after identifying a C-3 condition, a cold leg examination shall be performed at the next outage.

The classification of the generator in RF12 was based on the bobbin examination.

The total nimber of defective tubes (by bobbin and RPG) was conservatively added together with the bulk being ODSCC at eggerate supports. The bobbin program is conducted full length on 100% of the tubes thus providing detection technique for the cold leg.

Section 3.5 also addresses that the classification of the periodic sample shall be classified into one of the following categories by detection technique and location/regLion per SG examined. This implies that the C-3 category should be addressed by region such as the tubesheet.

During the RFJ2 examination, the following indications were identified:

SG31 SG32 Axial ODSCC 7 2 Axial PWSCC 22 4 Circ ODSCC 10 0 Circ PWSCC 28 2 Total 67 8 To go C-3 in the tubesheet alone would require a total of 89 indications. A large portion of the tubesheet indications was an inspection transient due to inspecting further down into the tubesheet from -5 to -8 inches. Therefore, an inspection in the cold leg tubesheet is not currently required by the guidelines.

2. What were the number and locations of the cold leg eggcratc indications:

SG31 SG32 RF12 0 2 RF13 7 5 Gen Outage Row Col Ind Loc Inch 32 RF12 16 18 SAl 03C -0.87 32 RF12 9 51 SAl 05C 0.69 31 RF13 2 26 SAl 07C -0.36 31 RF13 2 26 SAT 07C -0.32 31 RF13 112 32 SAl OIC -0.79 31 RF13 112 32 SAl OIC 0.35 31 RF13 112 32 SAl OIC -0.52 31 RF13 112 32 SAl 01C -0.30 31 RF13 112 32 SAT OIC 0.54 32 RFM3 85 55 SAl 09C -0.65 32 RF13 2 148 SAl 07C -0.47 32 RF13 2 148 SAI 07C -0.50 32 RF13 2 150 SAI 07C 0.35 32 RF13 2 150 SAI 07C 0.21

SG - 32 Waterford 3 RFO13 WTR3 20050401 0510412005 02:57:48 I ROW COL VOLTS DEG IND PER CHN LOCN INCHI INCH2 I CRLEN CRWID CEG BEGT ENDT PDIA PTYPE CAL L COMl

+- -- - - - - - - - - - +. ..... ........ +.... +.

.+.. +.. . .. +.+........ ... ++........ +.... ...... +++..+........... +... ... +. .. ... .... +. +.......... .. .

I 85 55 .24 109 SAX 4 09c -.65 .21 .33 50 09c 09c .600 ZPS3C 58 CI I C 2 2

148 148

.09

.18 108 136 SAX SAT 2

3 07C 07C

-.47

-.50

.49

.36

.37

.19 56 29 07C 67C 07H 07C

.560

.590 ZPUNS ZRSRG 55 72 CI Cl I

I I 2 150 .21 93 SAX 2 07C .35 .55 .20 .37 56 07C G7H .560 ZPUNs 55 Cl I 1 2 150 .39 137 SAI 3 07C .21 .39 .21 32 07C 07C .590 ZRSRG 72 Cl I

+................. + .+........ ... ... ++.

... .++... +.. +... +... .. ... +. +........ ... ++......... ++++...+.+.. +....................

I ROW COL VOLTS DEG IND PER CHN LOCN INCHI INCH2 I CRLEN CRWID CEG BEGT ENDT PDIA PTYPE CAL L COMI

+.. ... .+. .. .. + .. .. .+ . .. .... +.+ ...... ++.++.

.+...+ .... . ..... +......... .+. .+.+.. + .. ..... +.........+.+. -- -- --

Tubes: 3 Records: 5 1

SG - 31 Waterford 3 RF013 WTR3 20050401 e5/0412005 02:57:48 I ROW COL VOLTS DEG IND FER CHN LOCN INCHI INCH2 I CRLEN CRWID CEG BEGT ENOT PDIA PTYPE CAL L COMI

+.. +.+.. +-.-----------.-----------------------+ +-. .+-+-- -+

2 26 .14 111 SAI 2 07C -.36 .36 .41 63 07C 07H .560 ZPUN8 60 CI I I 2 26 .28 126 SAI 3 07C -.32 .30 .27 42 07C 07C .590 ZRSRG 8e Cl I I 112 32 .22 69 SAI 4 0IC -.79 .29 .55 84 OIC 01C .600 ZPS3C 68 ChLAR!

I 112 32 .37 90 SAI 4 01C .35 .21 .26 40 01C 01C .600 ZPS3C 68 CILARI 112 32 .47 132 SAI 3 OIC -.52 .16 .26 40 SIC 01C .590 ZRSRG 8e Cl I l 112 32 .37 102 SAI 3 01C -.30 .16 .24 37 SIC 0IC .590 ZRSRG B0 Cl I 112 32 .48 95 SAI 3 01C .54 .16 .25 39 81C 0IC .590 ZRSRG 8e CI I

+-- - .... --------- ...................................-.- + .-. +-+ + - t + + +.+. +

I ROW CoL VOLTS DEG IND FER CHN LOCH INCHI INCH2 I CRLEN CRWID CEG BEGT ENDT PDIA PTYPE CAL L COMI

  • - --- I ....-. . +- ..... - 4- ++.-.++.++..

-*- * . + .. + . +

- .+

Tubes: 2 Records: 7

SG - 32 Waterford 3 RFO/ fr WTR3 20650401 05/0412005 02:49:23

^,++++............................ ... +. . .. . . . .. . . . .. . . . .. . . .. . . . .. . . . .. . . . .. . . .. . . . .. . . . .. . . . .. . . .

I INSPDATE ROW COL VOLTS DEG IND PER CHNLOCh INCH1 INCH2 I CRLEN CRWID CEGSEGT ENDT POIA PTYPE CAL I COMI 4*'---- -------- -'--4 ... >--+ .

1 2093/10/01 16 18 .17 I;'2 SAX 3 03C -. 87 -. 69 0 .24 59 03C 03C .600 ZRS3C 85 Cl I I 2003110/01 9 51 .19 11.2 SAI 3 0sc .69 .97 0 .45 64 0sc e5C .600 ZRS3C 85 Cl I I INSPDATE ROW COL VOLTS DIG IND PER.. CHN LOCN INCHH INCH2 I CRLEN CRWID CEGBEGT ENDT PDIA PTYPE CAL 1 COl4 Tubes: 2 Records: 2

SG 31 Waterford 3 RFO/*- WTR3 20050401 05/04/2e05 02:49:22

,,,,,,,,,,x-,+,

-........................................................ +.4.-..-.......+ ...........................-.------.-..--................................. +

I INSPDATE ROW COL VOLTS DEG IND PER CHN LOCN INCH1 INCH2 I CRLEN CRWID CEGBEGT ENDT POIA PTYPE CAL L C0OI l .-----

.--................................... - +..+.---

, e-- ----------- I.................I.................................. -+---+---

+-----+-

... , ,,..,,,, . . . ........................................................................................ +-................................

I INSPDATE RO' COL VOLTS DEG IND PER C)IN LOCN IN INCINCH2 I CRLEN CRWID CEGSECT ENOT PDIA PTYPE CAL L COM11

......--........-................. . . . ....................-............. -- .-. l.-.......-.....-...-.-+- -

--- - ..--- - - - -.--.- +

Tubes; 0 Records: e

SG - 31 PLUGGED TUBE STATUS PRIOR TO RFO 13 Waterford RFO13 WTR3 3410

  • 7 STAY POSITION m571 PLUGGED TUBE 175 170 165 160 155 150 145 40 135 30 125 120 115 110 105 100 95 90 85 80 75 70 65 60 55 50 45 40 35 30 25 20 15 10 5; 145 I j .~r..**4~0~00,0,OOO000T0,0 I I I I1.... I 1 145 140 I Ii1001.000  : 0001 I 140 135 au O- . . .-

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00 0 4. 0 O4  ;. X  ; i 175 170 165 160 155 150 145 140 135 130 125 120 115 110 105 100 95 90 85 80 75 70 65 60 55 50 45 40 35 30 25 20 15 10 5 WestiNghouse ElectricCompanytiC . ST Max 051101200S 12i3:28

SG - 32 PLUGGED TUBE STATUS PRIOR TO RFO 13 Waterford RFOI13 WTR3 341 0

  • 7 STAY POSITION a484 PLUGGED TUBE 175 170 165 160 155 150 145 140 135 130 125 120 115 110 105 100 95 0 0 90 0 0 85 0 80 75 70 65 60 55 50 45 40 35 30 25 20 15 10 5 I 1 1 I1 I1 I1 I I 1 I &,o o A 1 n ..¶'o J oo ko I I I I I I I I I I I I I I 145 145

. . .. .-..-.- 0000 0'00 00.0 . . . . . .. . . . . . .

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- - - -- - -- -- - - - - - - -- -o 100 100 0

000 95 .000

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70 70 00: 00 65 - - - - - -- -.- - - - -o 0 65 60 60 55 0. 55 0a.. 6..0 D 0 0 50 +0 DD DBBBBBDB 50 I . ... . . .1. . . . . . . I . ... . . . ... . I . ... . . . ... . . .

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  • Waterford Tubesheet Map SG32: BW1 and BW9 Wear Growth (NDD assumed 5% in history)
  • Base Tubes BW 1 <1 0% Growth 0 BW1 >10% Growth
  • BW9 <10% Growth o BW9 10 to 20% Growth
  • BW9 >20% Growth o BW9 New <20% at RF13 no growth lookup V

I .. . . . . .

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Waterford Tubesheet Map SG32 BW1 and BW9 New and Historical Wear

  • Base Tubes a BWI New ABW9 New 03 BW1 Historical ABW9 Historical *pre RF13 Plugged Tubes 100 ~.. . .-.. ,....r. .....

80 . . . . .

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SG - 31 COLD LEG TUBE REPAIR RFO 13 Waterford RFOI3 WTR3 3410 a 151 STD MECHANICAL PLUG a 571 PLUGGED TUBE 5 13 LONG STABILIZER

  • 7 STAY POSITION STD MECHANICAL PLUG S 64 SENTINEL MECH PLUG T 19 STABILIZER MIN 54" STD MECHANICAL PLUG 175 170 165 160 155 150 145 140 135 130 125 120 115 110 105 100 95 90 85 80 75 70 65 60 55 50 45 40 35 30 25 20 15 10 145 0- 0 0 0 '00bi-145 140 00 140 135 135 130 130 125 125 120 120 115 115 110 110 105 105 100 100 95 95 90 0-.s..

0 0000

.. 00 0000...S 00 90 85 . .. . . . . 0.0.. . .. . .. . . 0. .. . . 0 85 80 0 0000... 0 .. 0000. 0.... . . 80 75 75 70 70

. . . . 00.. 0 65 65

.0 . . .. . . . . . . .. . .S 60 0.0 . . . . .S 60

.. . . . .. . . . . . . . . . . . . . . .s 55 55 50 50 45 45 40 40 35 35 30 30 25 25 20 20 15 15 10 10

  • .:~ O.01004 I - -.. O- I I , I IN.II .. ..... - ..... J'. 5 00T 0 .- - J~ I I I I III I I TOOO

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000 000000 0000CD0000DU 10 15 165 160 155 150 145 140 135 130 125 120 115 110 105 100 95 90 85 80 75 70 65 60 55 50 45 40 35 30 25 20 150 10 5 We.Vrflghoax ElwdicCon.p.nyLLC - ST Mux 05/110/2005 12:54:,43 Co)

SG - 31 HOT LEG TUBE REPAIR REQ 13 Waterford RFO13 WTR3 3410 m 215 STD MECHANICAL PLUG

  • 7 STAY POSITION S 32 STABILIZER MIN 54" STD MECHANICAL PLUG a 571 PLUGGED TUBE 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 1 115 120 125 130 135 140 145 150 155 160 165 170 175 I I I I- I III I I I I 145 I I I I I I I I I I .

14(2 140 .a .. .. .

ait a ..... .5.00 .. 140 135 00.........0 135 130 00..a.

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SG - 32 COLD LEG TUBE REPAIR RFO 13 Waterford RFO1 3 WTR3 341 0 m 104 STD MECHANICAL PLUG a 484 PLUGGED TUBE T 17 STABILIZER MIN 54' 7 STAY POSITION STD MECHANICAL PLUG 5 34 LONG STABILIZER STO MECHANICAL PLUG S 65 SENTINEL MECH PLUG 175 178 165 168 155 158 145 148 135 138 125 128 115 118 185 188 95 90 85 88 75 70 65 60 55 58 45 48 35 30 25 20 15 18 5 145 145 140 00 00 0 00 ... .

O-..000 0.0 ._

. . 140 135 00 ...... .0........

135 130 00..00....

0.00............ 130 125 125 128

  • 0.0 120 115 115 118 0.0 . ... .0 00 118 0.0.. .0.0...0.0 . .

185 185 188 188 95 0., 95 90 98 85 00 85 88 .0.. . . . . . .0 88 75 75

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70 70 0.a.

65 ... . . . . . . . . . . .

65 68

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SG - 32 HOT LEG TUBE REPAIR RFO 13 Waterford RFO13 WTR3 3410 U 199 STD MECHANICAL PLUG 5 21 STABILIZER MIN 54" STD, MECHANICAL PLUG a 484 PLUGGED TUBE

  • 7 STAY POSITION 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120 125 130 135 140 145 150 155 160 165 170 L75 145 1 1 -- i 1 1 1 ,I~A I I J I e 0 ~ I I I I I I I I I I 145 140 140 135 135 130 0

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