ML20092L104

Discusses Millstone Nuclear Power Station,Unit 3 Re Steam Generator Tube Inservice Insp Rept

ML20092L104
Person / Time
Site:	Millstone
Issue date:	02/18/1992
From:	Scace S NORTHEAST NUCLEAR ENERGY CO., NORTHEAST UTILITIES
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
MP-92-179, NUDOCS 9202260164
Download: ML20092L104 (12)

Text

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' *a m e u.c w n e,< u t, me, gm pgg gg3 Docket No. 50-423 Re: 10CFR50.36 February 18 1992 MP-92-179 U.S. Nuclear lugulatory Commiuion Document Control Dest Washington, D.C. 20555 Gentlemen:

hlillstone Nuciaar Power Station, Unit No. 3 Steam Generator Yubt inservice Inspection Report This report is being submitted within 12 months following the completion of the third Inservice Eddy Current inspection of the h1illstone Unit 3 Steam Generator (SG) tube 3 pursuant to Technical Specification 4.4.5.5.b.

The End of C cle 3 SG tube inspection was cumpleted on February 21,1991. In 3

accordance with Technical Specification 4.4.5.2, an initial sample of steam generator tubes (shown on Figures 1 and 2) was selected and inspected. The results of this sample classified the steam generators in the C-1 category (Less than 5 5 of the total tubes inspected are deeraded tubes and none of the inspected tubes are defective). An additional sample of 6392 tubes was inspected. Included within this sample was 100 percent Eddy Cmrent Testing of all ihe tubes associated with the anti-vibration bar (AVB) wear regions in both the "B" and "D" steam generators. The intent of this augmented sample was to ensure the Unit 3 Eddy Current Program detects and monitors steam generator tube wall degradation and damage precursors. The complete results of the inspections are provided in Tables 1 through 3.

The complete inspection totaled 7101 bobbin probe tests (319 of the tubes in all 4 SGs) including 3555 tubes in steam generator "B" (63.29 of the tubes in 'B', shown on Figure 3) and 3546 tubes in "D" (63 G of the tubes in 'D', shown on Ficure 5). All tubes except row I were run full length, tube end to tube end. The row one tubes were run from the hot leg tube end to the eighth tube support plate on the cold leg. The following are the summary results of the Eddy Current inspections for each steam generator:

"B" Steam Generator The most significant tube degradation was outside diameter flow induced vibrational wear, located at the SG AVBs. A total of five tubes examined (or 0.14 "c of the tubes inspected) in the "B" SG were degraded, (i.e., exhibiting wear greater than 20 percent).

A small number of outer diameter indications not originating at an AVB were identified by this examination. Three tubes (0.0SG of the tubes inspected in "B" SG) were identitied by bobbin probe as having -greater than 20% wall loss. They were low amplitude signals, v.hich gencially measme less than 309 through wall.

The da, for all tubes degraded by 20 9 or more is provided in Table 2. Figure 4 show h[

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the location of all indications and plugged tubes within the 1r steam generator.

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"D" Steam Generator Acain. most of the decradation was vibrational wear, which occurred at the AVB recion.

Of the 3546 tubes exainined. 39 tubes were identified as degraded (experiencinc darhage 20ri throughwall or creater). Of these 39 tubes, five (5) tubes (or 0.14ri of the tubes inspected.a "D" SG) had sufficient damage to be considered defective in accordance wit 1 the definitions stated in Technical Specification 4.4.5.4. These tubes, at locations R43-C42, R43-C103. R53-C86. R53-CSS and R$3-C90 all contained,vear type indications exceeding the plugging limit of 40G throughwall. In accordance with Technical Specifications these tubes were removed from service.

Two (2) additional tubes were identified with OD wall loss treater than 200i throughwall, not attributed to anti-vibration bar wear. One tube, RS-C1, which was identified with 30ri throuch wall damage, had not changed since the preservice baseline examination, This indication was determined to be the result of either the installation or manufacturing process. Both tubes are identified in Table 3.

The total tubes examined in "D" steam Generator exhibitinc depradation was 1,16G.

All tubes having greater than 20?? degradation are identifiecion Table 3 and Figure 6.

A limited number of steam generator tubes are exhibiting wall thickness degradation due to flow induced vibrational wear, typical of that experienced in most Westinghouse blodel F Steam Gene * "nrs. The wear is limited to row numbers greatu than 20 on the periphery and greatei ihan 30 in mid bundle (approximately). The flaws in mid bundle tend to be shallower than those on the periphery. AVB continues to be the only active damage mechanism affecting the h1P-3 steam generators.

The licensee contact for this report is Larry Loomis, who may be reached at (203) 447-1791, Extension 5468.

Very truly ve"rs, NORTHEAST NUCLEAR kNERGY COh1PANY

?)b0s '

. tag, Stephen L2 Se ce-Director, hiillstone Station SES/LL:ljs Attachment ec:

T. T. h1artin, Region 1 Administrator W. J. Raymond, Senior Resident inspector, hiillstone Unit Nos.1, 2 and 3 V. L. Rooney, NRC Project hlanager, hlillstone _ Unit No. 3 m____m

.u___2--_--

TAllLE I Alli.LSTONE UNIT 3 END Ol' CYCL.I' 3 EDDY CUllRENT llOlllllN RESUl!!S Dutdittien

'll' SCt 11' SG Iulltl Number of Tubes Examined 3555 3546 7101 Tubes With Flaw Indications Wall loss 19 to 19% TWD 5

33 3S Wall loss 209 to 39G TWD 8

41 49 Wall loss 40% to 100G TWD 0

5 5

T ' t 4 With AYll Wear ludicatluns Wall loss 1G to 199 TWD 1

26

-27 Wall loss 20G to 39% TWD 5

39 44 Wall loss 404 to 1009 TWD 0

5 5

l' lugging Tubes Previously Plueged 3

2 5

Number of Tubes l' lugged Subsequent to this inspection 0

5 5

Total Currently Plugged 3

7 10 TWD - Through Wall Depth TAllLE 2 DEGitADATION 200 TilROUGli WALL OR GitEATER

'll' STEAM GENEllATOR ROW GR IMnlGb' 9'lW XQ1Jfi LOCATIOX 41 34 WEAR 24 0.98 AV4 + 0.00 42 40 WEAR 24 0.93 AV4 + - 0.00 45 56 ODI 25 1.03 07C + 38.30 51 88 ODI 26 0.67 0711 + 29.26 52 86 WEAR 27 1.52 AV3- + 0.00 53 74 WEAR 26 1.48 AV1 + 0.00 58 76 WEAR 26 1.28 AV5 + 0._00 WEAR 32-1,79 AV4 + 0.00 59 65 ODI 2S 1.36 AV2 + 0.93 ODI - Outer Diameter Indication

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4 TAllLE 3 DEGitADATION 20'i TilitOUGil WALL Olt GREATElt

'D' STEAM GENEllATOlt ROH C.0L IND.lCX110N

'iTW YHLIS IMCallDX 5

1 ODI 30 1.97 08H + 2.85 28 114 WEAR 26 1.10 AY1 + 0.00 28 115 WEAR 27 1.13 AV1 + 0.00 32 3S WEAR 20 0.81 AV5 + 0,00 33 21 ODI 28 0.48 07C + 20.70 36 45 WEAR 23 0.S9 AV5 + 0.00 WEAR 20 0.77 AV3 + 0.00 37 106 WEAR 21 0.77 AV4 + 0.00 40 99 WEAR 24

-0.97 AV5 + 0.00-WEAR 20 0.72 AY5 + 0.00 WEAR 21 0.80 AV3 + 0.00 WEAR 23 0.89 AV2 + 0.00 4i 26 WEAR 25 1.06 AV5 + 0.00 41 51 WEAR 35 1.83 AV4 + 0.00 WEAR 23 0.99 AV3 + 0.00 WEAR 23 0.96 AY2 + 0.00 WEAR 22 0.87 AV6 + 0.00 4'

57-WEAR 26 1.13 AY5 + 0.00-WEAR 26 1.16 AV3 + 0.00 42 100 WEAR 23 0.88 AV5 + 0.00 WEAR 21 0.79 AV4 + 0.00 WEAR

-27 1.11-AV3 + 0.00 -

41 101 WEAR 20 0.76-AV2 + 0.00 42 102 WEAR 27-1.11

'.V5 + 0.00 WriAR 21 0.%

AV4 + 0.00 43 23 WEAR-22 0.92 AV5 + 0.00 43 42-WEAR 22 0.90

- AV6 + 0.00 WEAR 41 2.46 AV5 + 0.00 WEAR-38-2.18 AV4 + 0.00 WEAR 23 0.95 AV3 + 0.00 43 58 WFAR 23 0.9 7. -

AV4 +-- 0.00 43 69 WEAR 22-0.82 AV5 + 0.00 WEAR 23 0.89 AV4 + 0.00 WEAR' 26

-1.09 AV3 + 0.00 43 75 WEAR 20 0.75 AV5 + 0.00

TAllt.E 3 (Continuni)

DEGitADATION 20'i TilitOUGli Wall Olt GREATElt

'D' STEA.T1 GENEllATOR ROH CDL LX111CMl0E

'HH YOllis LuCAHOS WEAR 22 0.83 AV4 + 0.00 43 91 WEAR 28 1.18 AV2 + 0.00 43 103 WEAR 24 1.05 AV6 + 0.00 WEAR 31 1.49 AV5 + 0.00 WEAR 41 2.45 AV4 + 0.00 WEAR 42 2.59 AV3 + 0.00 WiiAR 35 1.85 AV2 + 0.00 J

47 99 WEAR 24 (1.97 AV6 + 0.00 48 95 WEAR 31 1.47 AV5 + 0.00 WEAR 29 1.31 AV3 + 0.00 48 96 WEAR 22 0.94 AV5 + 0.00 49 66 WEAR 20 0.74 AV2 + 0.00 51 45 WEAR 34 1,76 AV6 + 0.00 WEAR 27 1,17 AV5 + 0.00 WEAR 28 1.24 AV4 + 0.00 WEAR 26 1.13 AV3 + 0.00 51 46 WEAR 22

- 0.88 -

AV6 +- 0.00--

WEAR 31 1.45 AV4 + 0.00.

WEAR 25 1.04 AV2 + 0.00 51 6S WEAR 21 0.83

- AV6 4 0.00 WEAR 24 1'03 AV4 + 0.00 51 81 WEAR 29 1.37 AV4 + 0.00 WEAR 28 1.26 AV5 + 0.00 52 70 WEAR 21 0.84 AV5 + 0.00 WEAR 24 1.01-LAV4 + 0.00 WEAR 29 1.32 AV3 + 0.00-

-WEAR 23 0.98 AV2 + 0.00 52 89

. WEAR 32 1.54 AV4 + - 0.00 WEAR-J26 1.14 AV3 + 0.00 52 90 WEAR 25 1.07_

AV5 + 0.00 WEAR 32 1.61 AV4 + 0.00 WEAR 34 1.78 AV2 + 0.00 53 86 JWEAR 48 3.58 AV5 + 0.00

WEAR -

43 2.72-AV4 + 0.00

TAllLE 3 (Continued)

DEGitADATION 20'i Tituot'Gli WALI. OR Gill:ATER

'D' STI:Ahl GENERATOR ROlY COL LNDICEIION PrTW XQL]E LOfXUON WEAR 53 4.71 AV3 + 0.00 WEAR 24 1.03 AV2 + 0.00 53 SS WEAR 41 2.45 AVS + 0.00 WEAR 39 2.20 AV4 + 0.00.

WEAR 34 1.73 AV3 + 0.00 53 90 WEAR 24 1.02 AV6 + 0.00 WEAR 24 1.00 AV5 + 0.00 W-47-

-3.28

- AV4 + 0.00 WEAR 40 2.33 AV3 + C.00 WEAR 35 1.83 AV2 + 0.00 WEAR 20 0.79 AY1 + 0.00 54 SS WEAR 37 2.01 AV6 + 0.00 WEAR 21 0.89 AV4 + 0.00 55 63 WEAR 37 2.00 AV6 + 0.00 WEAR 31 1.50 AV5 + 0.00 WEAR 32 1.58 AV4 + 0.00 WEAR 32 1.58 AV3 + 0.00 WEAR 21 0.89 AV2 + 0.00 55 70 WEAR 24 1.05 AV5 + 0.00 57 57 WEAR 20 0.79 AV2 + 0.00 57 78-WEAR 20 0.82 AV4 + 0.00 WEAR 22 0,89 AV3 + 0.00 WEAR 22 0.88

- AV2 '+ 0.00

• Tubes I' lugged during this Refueling Outage a

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