ML20029A580

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Annual Steam Generator Inservice Insp Rept.
ML20029A580
Person / Time
Site: North Anna Dominion icon.png
Issue date: 02/18/1991
From:
VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:
Shared Package
ML20029A577 List:
References
NUDOCS 9102250273
Download: ML20029A580 (16)
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  • 4 ATTAC11 MENT 1 NORTH ANNA POWER STATION UNIT 2 1990 ANNUAL STEAM GENERATOR INSERVICE INSPECTION REPORT VIRGINIA ELECTRIC AND POWER COMPANY l

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-ATTACHMENT 1 x,; ,

5 NORTH ANNA' ~ POWER STATION m ' UNIT 2 -!

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REFUELING L OUTAGE -

SEPTEMBER 1990 EDDY CURRENT EXAMXNATION'

SUMMARY

Q During1the~19904 refueling,. outage'for.. North-Anna Power Station' Unit .;

2) the:-' tubes ' 'in t h e - " A '.' , , " B " ,

and "C" steam generators: _.w ere --

Texamined; The material that follows presents the results of those '

.. examinations. iThese results include the number and extent of.the f" ' , ' tubes: examined, ' location- and- characterization , of each< indication- "

.j ?of E;an: imperfection, c and Lidentification' of c the thbes that -i- we re

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pluggeidis,; Attachment 2hto'this letter provides a glossary of: terms

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NORTH ANNA POWER STATION UNIT 2 REFUELING OUTAGE ~

SEPTEMBER 1990 EDDil CURRENT EXAMINATION

SUMMARY

STEAM GENERATOR "A" In "A" Steam Generator, 3277 tubes ware examined full length with bobbin probes. This is approximately 100% of the available tubes.

Supplemental examinations were also performed using Rotating Pancake, 8x1, and Profilometry probes where additional confirmatory or other data was desired. Of the tubes examined, thirteen had pluggable circumferential indications, fourteen had pluggable axial indications, one had a pluggable indication between 50% and 59% through wall, five had pluggable indications between 40% and 49% through wall, thirteen had indications between 30% and 39% through wall, twenty-six (26) had indications between 20% and 29% througn wall, and nine had indications between 1% and 19% through wall. A total of thirty-three (33) tubes were plugged in the "A" Steam Generator. Refer to the table below for details.

%TWD Location Row-Column Remarks SAI TSH R05C01 PLUGGED SAI TSH R05C01 PLUGGED SAI TSH R02C02 PLUGGED 28 1C R18C06 80 TSH R05C07 PLUGGED SAI TSH R05C07 PLUGG"D SAI TSH R05C07 PLUGGED 87 TSH R03C08 PLUGGED SAI TSH R03C08 PLUGGED SAI TSH R08C14 PLUGGED SCI TSH R07C20 PLUGGED SCI TSH R07C20 PLUGGED SAI TSH R24C22 PLUGGED SAI TSH R24C22 PLUGGED SCI TSH R23C23 PLUGGED SCI TSH- R23C23 PLUGGED SCI TSH R10C24 PLUGGED 89 TSH R21C26 PLUGGED SAI TSH R21C26 PLUGGED TI TSH R38C30 PLUGGED SAI TSH R38C30 PLUGGED 15 AV2 R18C31 25 AV3 h34C31 21 2C R42C31 21 2C R42C31 38 1H R07C32 PLUGGED 41 1H R07C32 PLUGGED SAI 1H R07C32 PLUGGED {

41 1H R07C32 PLUGGED

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Page 3 of 12 NORTH ANNA POWER STATION UNIT 2 STEAM GENERATOR "A"

%TWD Location Row-Column Remarks 17 AV2 R19C32 22 AV1 R36C33 21 AV2 R36C33 6 1H R44C35 19 1H R44C35 16 1H R44C35 DI 1H R05C37 23 1H R05C37 e- SAI TSH R15C38 PLUGGED SCI TSH R15C38 PLUGGED

{ AV1 R33C38 15 '

20 AV2 R33C38 16 AV3 R33C38 24 AV3- R41C38 24 AV4 R41C38 TI TSH R13C39 PLUGGED SAI TSH R13C39 PLUGGED SAI TSH R13C39 PLUGGED SAI TSH R10C40 PLUGGED SCI TSH R10C41 PLUGGED 26 AV1 R24C41 20 AV3 R24C41 25 AV4 R24C41

-14 AV1 R37C41 28 AV2 R37C41 ,

38 AV3 R37C41 35 avl- R33C42 16 AV2 R33C42 13 AV3 R33C42 12 AV4 R33C42 SCI TSH R14C43 PLUGGED.

SCI TSH R14C43. PLUGGED SAI TSH R11C44 PLUGGED SCI TSH R11C44 PLUGGED SAI TSH R15C44 PLUGGED SAI TSH R15C44 PLUGGED 17 AV1 R22C44 23 AV2 R22C44

. 22 AV3 R22C44 18 R22C44 AV4 14 AV1 R23C44 18 AV2 R23C44 24 AV3 R23C44 22 AV4 R23C44 21 AV1 R25C44 28 AV2 R25C44 18 AV3 R25C44  !

25 AV4 R25C44 l

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  • -- Attachment 1  !

Page 4 of 12 NORTli ANNA POWER STATION UNIT 2 STEAM GENERATOR "A"

%TWD Location Row-Column Remarks 16 AV2 R34C44 17 AV3 R34C44 21 AV4 R34C44 SAI TSH R12C45 PLUGGED SCI TSH R12C45 PLUGGED SCI TSH R14C45 PLUGGED 19 AV1 R22C45 34 AV2 R22C45 31 AV3 R22C45 25 AV4 R22C45 15 AV2 R34C45 4 24 AV3 R34C45 17 AV4 R34C45 23 AV1 R35C45 23 AV2 R35C45 15 AV3- R35C45 SCI TSH R10C46 PLUGGED 4 SCI TSH R14C46 PLUGGED 30 AV2 R36C46 20- AV3 R36C46 ,

17' AV4 R36C46 SCI TSH R13C47 PLUGGED SCI TSH R13C47 PLUGGED 19 AV1 R35C47 28 AV2 R35C47 j 25 AV2 R35C47

.25 - AV3 R35C47

'19 Av3 R35C47  ;

26 AV4 R35C47 i

'16 AV1 R25C48 3 18 AV2 R25C48 .

12 AV3 R25C48 11 AV4- R25C48 28 AV1 R36C48 35 AV2 R36C48  ;

26 AV3 R36C48 20 AV4 R36C48 24 hV2 R35C49 33 Av3 R35C49 15 AV1 R34C50 29 AV3 R34C50 21 AV4 R34C50 11 AV1 R35C50 26 AV1 R35C50 20 AV2 R35C50 32 AV2 R35C50 23 AV3 R35C50 34 AV3 R35C50

'* Attachment 1 Page 5 of 12 NORTH ANNA POWER STATION UNIT 2

._ STEAM GENERATOR "A"

%TWD Location Row-Column Remarks 20 AV4 R35C50 25 AV1 R29C51 PLUGGED 42 AV2 R29C51 PLUGGED 13 AV3 R29C51 PLUGGED

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29 AV3 R29C51 PLUGGED 14 AV2 R34C52 27 AV3 R34C52 22 AV4 R34C52 17 AV1 R36C52 31 Av2 R36C52 30 AV3 R36C52 21 AV4 R36052 13 Av1 R24C53 23 AV4 R24C53 27 AV1 R36C53 PLUGGED 44 AV2 R36C53 PLUGGED 31 AV3 R36C53 PLUGGED 19 AV4 R36C53 PLUGGED 29 AV2 R24C55 27 Av3 R24C55 31 AV3 R36C55 30 AV4 R36C55 30 AV1 R29C57 PLUGGED 52 AV2 R29C57 PLUGGED 26 AV3 R29C57 PLUGGED 29 AV2 R32C57 30 AV3 R32C57 TI TSH R43C57 PLUGGED 45 TSH B43C57 PLUGGED SAI TSH P43C57 PLUGGED 13 AV1 R29C60 27 AV2 R29C60 27 AV3 R29C60 21 AV4 R29C60 99 TSH R16C61 PLUGGED TI TSH R16C61 PLUGGED SAI TSH R16C61 PLUGGED 14 AV3 R24C61 24 AV3 R36C61 19 AV4 R36C61 20 AV1 R24C63 TI TSH R09C65 PLUGGED SCI TSH R09C65 PLUGGED 19 AV2 R23C66 21 AV3 R23C66 15 AV4 R23C66 TI TSH R19C67 PLUGGED SAI TSH R19C67 PLUGGED

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Attachment 1 Page 6 of 12 NORTH ANNA POWER STATION UNIT 2 l STEAM GENERATOR "A"

%TWD Location Row-Column Remarks 20 AVI R23C67 19 AV2 R23C67 26 AV3 R23C67 16 AV2 R37C67  !

27 AV3 R37C67 14 AV4 R37C67 f 35 AV3 R36C68 26 AV4 R36C68 18 AV2 R37C68 39 AV3 R37C68 17 AV4 R37C68 SAI- TSH R38C68 PLUGGED  !

R38C68 SAI TSH PLUGGED 19 AV4 R18C69 13- AV1 R31C69 15 AV2 R31C69 28 AV2 R37C69 35- AV3 R37C69 i 28 AV4 R37C69

-16 AV4 R24C75 45 2C R31C81 PLUGGED 8 2C' R31C82 l) 20 2C R31C82 SAI TSH R11C91 l 17 TSH R11C91  !

17 TSH R11C91 l

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  • Attachment 1 Page 7 of 12 NORTH ANNA POWER STATION UNIT 2 REFUELING OUTAGE -

SEPTEMBER 1990 EDDY CURRENT EXAMINATION

SUMMARY

STEAM GENERATOR "B" In "B" Steam Generator, 3276 tubes were examined full length with bobbin probes. This is approximately 100% of the available tubes.

Supplemental examinations were also performed using Rotating Pancake, 8x1, and Profilometry probes where additional confirmatory or other data was desired. Of the tubes examined, seven had pluggable circumferential indications, seven had pluggable axial indications, two had pluggable indications between 70% and 79% through wall, one had a pluggable indication between 50% and 59% through wall, six had pluggable indications between 40% and 49% through wall, eight had indications between 30% and 39% through wall, six had indications between 20% and 29% through wall, five had indications between 1% and 19% through wall, and one tube had an indication characterized as "MBM" (manufacturer's buff mark). A total of twenty-three (23) tubes were plugged in the "B" Steam Generator. Refer to the table below for details.

%TWD Location Row-Column Remarks 20 1C R26C10 21- AV3 R35C21 30 AV4 R35C21 SCI TSH R27C27 PLUGGED SCI TGH R27C27 PLUGGED 11 AV4 R37C27 SCI TSH R08C28 PLUGGED 34 AV1 R25C28 15- AV2 R25C28 35 AV2 R17C29 23 AV3 R34C31 28- AV4 R34C31 SAI. TSH R22C32 PLUGGED SAI TSH R22C32 PLUGGED 78 TSH R11C35 PLUGGED SAI TSH R11C35 PLUGGED DI 1H R29C40 PLUGGED

- 74 1H R29C40 PLUGGED SCI 1H R29C40 PLUGGED SCI TSH R14C43 PLUGGED SCI TSH R14C43 PLUGGED 31 AV2 R33C43 23 AV3 R33C43 23 AV1 R32C44 PLUGGED 31 AV2 R32C44 PLUGGED R32C44 PLUGGED I 41 AV3 22 AV4 R32C44 PLUGGED

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,' Page 8 of 12 NORTH ANNA POWER STATION UNIT 2 STEAM GENERATOR "B"

%TWD Location Row-Column Remarks SCI TSH R14C45 PLUGGED SCI TSH R15C45 PLUGGED SCI TSH R15C45 PLUGGED MCI TSH R15C48 PLUGGED MCI TSH R15C48 PLUGGED MCI TSH R15C48 PLUGGED MCI TSH R15C48 PLUGGED DRT TSH R27C48 PLUGGED SAI TSH R27C48 PLUGGED SAI TSH R27C48 PLUGGED 33 AV2 R39C48 PLUGGED 48 AV3 R39C48 PLUGGED 46 AV4 R39C48 PLUGGED SAI- TSH R05C51 PLUGGED MA1 TSH R05C51 PLUGGED SCI TSH R30C52 PLUGGED 55 AV1 R39C52 PLUGGED 52 AV2 R39C52 PLUGGED 44 AV3 R39C52 PLUGGED 31 AV1 R32C53 PLUGGED 40 Av2 R32C53 PLUGGED 35 AV2 R32C53 PLUGGED 25 AV3 R32C53 PLUGGED 17 AV2 R36C53 30 AV3 R36C53 98 TSH R29C54 PLUGGED SAI TSH R29C54 PLUGGED SAI TSH R29C54 PLUGGED SAI TSH R29C54 PLUGGED 40 AV2 R39C56 PLUGGED 42 AV3 R39C56 PLUGGED 24 AV4 R39C56 PLUGGED 21 AV2 R29C58 PLUGGED 20 AV2 R29C58 PLUGGED 43 AV3 R29C58 PLUGGED 37 AV3 R29C58 PLUGGED 37 AV4 R29C58 PLUGGED 23 AV4 R29C58 PLUGGED 23 AV4 R29C58 PLUGGED 24 AV3 R30C59 17 AV3 R39C59 27 AV4 R39C59 28 AV3 R37C60 34 AV4 R37C60 SAI TSH R29C61 PLUGGED 15 AV1 R32C61 PLUGGED 41 AV2 R32C61 PLUGGeo 22 AV3 R32C61 PLUGGED

Attachment 1

,' Page 9 of 12 NORTH ANNA POWER STATION UNIT 2 STEAM GENERATOR "B"

%TWD Location Row-CoJ amn Remarks 74 TSH R08C62 PLUGGED SAI TSH R08C62 PLUGGED SAI TSH R08C62 PLUGGED 30 AV1 R29C62 17 AV3 R29C62 22 AV4 R29C62 20 AV1 R21C63 17 AV2 R21C63 24 AV3 R21C63 33 AV4 R21C63 15 AV3 R34C69 26 AV4 R34C69 93' 3H R38C70 PLUGGED SAI 3H R38r70 PLUGGED MBM 7C ROSC;/

15 AV4 R3 6C'/1 2 4 -- 2H R36C75 27 AV3 R36C75 16 TSC R15C77 15 1C R28C83 14 1C R27C90 l

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Page 10_of 12

= NORTH ' ANNA POWER STATION UNIT - 2 REFUELING OUTAGE ' - SEPTEMBER 1990 EDLY CURRENT EXAMINATION

SUMMARY

STEAM GENERATOR "C"

In'"C" Steam Generator,_3249 tubes
were-examined full length _with-bobbin _ probes. This is approximately 100% of the available tubes.

Supplemental _. examinations were also performed using Rotating Pancake, 8x1, and Profilometry probes where additional confirmatory or=other data was desired. Of the tubes examined, six had pluggable circumferential indications, eleven _had pluggable axial indications,_one had a'_pluggable indication between.90%:and:100% through wall, two had pluggable indications between'80% and_89% through wall, one had a pluggable indication between 70.% andJ79%:through wall _one-had.a pluggable' indication- -

.between?60% and-69% through wall, five had pluggable indications

-between-50%_and'59% through wall,-thirteen had'pluggable

' indications between140% Land 149%_-through wall, thirteen had' indications-between-3,0%;:.and 39% through. wall (of which four were-

' administratively. plugged), eleven had. indications between 20% and 29% through wall, eleven had indications betweenl1% and'19%-

-through wall,-and three were characterized as " indication not found,"= A-total of. forty-four'(44) tubes were plugged in~the "C" Steam' Generator. 1 Refer to the table below for details, o

'%TWD Location ' Row-Column Remarks

- .10 0 - 2H- .R19C06 PLUGGED' SAI 2H R19C06- PLUGGED

.SAI-

- 2H. R19C06 - PLUGGED SAI 2H: R15C07 PLUGGED

'88 sHi -R15C07 PLUGGED 30: h

. -R23C19

SAI- 2H_ R28C19 PLUGGED--

53 1H R31C19 PLUGGED

>40 2H: JR31C19 PLUGGED

-2 2C ~R37C21 47- 1H ~R27C23 -PLUGGEDt 23= AV2 R36C25 56 -2H R29C26 PLUGGED 36 AV2- R39C26

-24 AV3 - R39C26

'83 -2H R05C27 PLUGGED MAI 2H R05C27 PLUGGED 3 2H R18C28 SAI TSH R04C29 PLUGGED' 28 ~1H R31C29 MAI 1H R19C31 PLUGGED 27 -3H R19C31 PLUGGED

  • Attachment 1 Page 11 of 12 NORTH ANNA POWER STATION UNIT 2 STEAM GENERATOR "C"

%TWD Location R o w - C o l a m r. Remarks 38 2H R26C31 PLUGGED 35 AV2 R39C31 30 AV3 R39C31 33 2H R18C33 PLUGGED SAI IH R24C33 PLUGGED 4 2C R43C33 1 1H R02C34 43 1H R30C34 PLUGGED 33 AV3 R29C36 SCI 1H R12C37 PLUGGED SAI TSH R18C37 PLUGGED 52 1H R03C39 PLUGGED 26 AV2 R24C39 25 AV3 R24C39 47 1H R34C39 PLUGGED 29 1H R42039 15 2H R14C40 49 2H R32C40 PLUGGED 29 AV3 R23C41 62 1H R12C43 PLUGGED SAI 1H R15C43 PLUGGED SCI TSH R17C43 PLUGGED SAI 2H R23C43 PLUGGED 13 AV1 R33C43 17 AV2 R33C43 8 1C R45C43 40 1H R03C44 PLUGGED 48 1H R18C44 PLUGGED SCI TSH R24C44 PLUGGED SCI TSH R25C46 PLUGGED SCI TSH R23C47 PLUGGED 29 2H R35C49 39 2H R38C49 PLUGGED 42 1H R18C50 PLUGGED 32 3H R18C50 PLUGGED 83 2H R19C51 PLUGGED 21 AV3 R27C51 36 AV4 R27C' 70 4H R12C. PLUGGED 70 4H R12C52 PLUGGED 17 AV1 R17C53 18 AV2 R17C53 16 AV3 R17C53 33 AV3 R37C53 PLUGGED 41 AV4 R37C53 PLUGGED 99 1H R43C53 PLUGGED R12C54 I 26 1H SCI TSH R15C54 PLUGGED

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  • Attachment 1

%TWD Location Row-Column Remarks 21 TSH R17C54 PLUGGED 88 IH R17C54 PLUGGED 94 3H R17C54 PLUGGED 99 4H R17C54 PLUGGED SAI 1H R17C54 PLUGGED 52 3H R17C54 PLUGGED 35 AV3 R29C56 17 AV4 R29C56 23 1C R44C56 21 AV1 R33C57 18 AV2 R33C57 18 AV3 R33C57 14 AV4 R33C57 44 1H R16C58 PLUGGED 50 1H R18C59 PLUGGED 32 AV1 R39C60 36 AV2 R39C60 32 Av3 R39C60 20 AV3 R42C60 25 AV4 R42C60 22 AV1 R29C62 35 AV2 R29C62 28 AV3 R29C62 26 1H R12C65 12 2H R18C66 85 2H R13C67 PLUGGED 31 1H R18C67 PLUGGED 44 .2H R18C67 PLUGGED 59 1h R28C67 PLUGGED 34 1H R24C69 PLUGGED 39 AV1 R34C69 33 AV2 R34C69

'SAI- TSH R23C71 PLUGGED 10 1H R03C77 43 2H R28C80 PLUGGED 46 3H R04C91 PLUGJED 2 1C R06C93

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1 ATTACHMENT ._

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a ' GLOSSARY - OF -TERHS

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' NORTH - ANNA POWER STATIO14 .,

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-ANNUAL' - STCAN / GENERATOR 1, .

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-2NSERVICE' -INSPECTION REPORT -

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' VIRGINIA. ELECTRIC AND POWE2 COMPANY

3 ATTACHMENT 2 VIRGINIA ELECTRIC AND POWER COMPANY ANNUAL STEAM GENERATOR REPORT EDDY CURRENT TUBE INSPECTION GLOSSARY OF TERMS

1) COI -

CIRCUMFERENTIALLY ORIENTED INDICATION -

describes a circumferentially oriented indication signal from Rotating Pancake probe data - either single or multiple signals - SCI or MCI will be used if it is possible to clearly detect the number of signals present.

2) DI -

DISTORTED INDICATION - a possible tube wall loss condition that is unquantifiable with a numeric percent call due to the existing signal characteristics,

3) INR -

INDIC A'1 ION NOT REPORTABLE -

j^dicates that a very small tube wall loss - condition exists in the data being analyzed that is below the reportable critoria threshold for this specific inspection - can be 1 sed to address indications called in prev 30us inspections that are still detectable but fall below current criteria.

4) MBM -

MANUFACTURING BUFF MARK -

a tube wall loss condition due to a tube manufactaring process step -

generally a relatively long shallow loss . area -

remains constant and does not present any operating problems for the tube - noted for reference only.

5) MA.T -

MULTIPLE AXIAL INDICATION -

describes multiple axially oriented indication signals from Rotating Pancake probe data.

6) MCI -

MULTIPLE CIRCUMFERENTIALLY ORIENTED INDICATION -

describes multiple circumferential1y oriented- indication signals _from Rotating Pancake probe data - COI is used if it is impossible to clearly detect the number of signals present. ,:

7) PI -

POSSIBLE INDICATION (retect) -

generally used with 8x1 analysis, sometimes with bobbin analysis - describes a potential wall loss condition signal that typic 611y requires a retest for verification - sometimos retested with a special probe, e.g., MRPC, etc.

8,) SAI -

SINGLE AXIAL INDICATION -

describes a single '(

axially oriented signal from Rotating Pancake probe data.

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  • Attachment-2 Page 2 of 2

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9) SCI -

SINGLE CIRCUMFEF ENTI ALLY ORIENTED INDICATION -

describes a single circumferentjally oriented indication signal f rom Rotating Panchke probe data - COI is used if it is impossible to clear.1y detect the number of signals present. ,

10) TI -

TUBESHECT INDICATION (retest) -

generally used with bobbin analysis, identifien oossible indications that can be found at TSH within +3 in, to -2 in, range -

typically requires retest for-veri.~1 cation with an RCP probe.

11)- 1.T .- DISTORTED ' ROLL TRANSITION -

a roll transition cignal that is abnormal due to possible indication inf]uence but that.does not yet display clear DRI characteristics - it is noted for future reference.

12) TEP - Tube End Hot leg.
13) TEC -

Tuoe End C to eg.

14) TSH -

Top of Tubesheet Hot leg.

15) TSC -

Top of Tubesheet Cold leg.

16) #C, #H . -_ ( # = number) of Support Plate Hot or Cold leg, e.g., 3H, 6H, 7C.
17) Avl, AV2, AV3, AV4 -

Anti-Vibration Bars 1 thru 4.

Note: Where 'rx) comment appears in.the remarks column the tube is still.in service.

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