ML20094H027

1991 Annual Steam Generator Inservice Insp Rept

ML20094H027
Person / Time
Site:	Surry
Issue date:	12/31/1991
From:	VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:
Shared Package
ML18153C918	List: ML20094H027
References
NUDOCS 9203060258
Download: ML20094H027 (6)

Text

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i ATTACHMENT 1 l

l VIRGINIA ELECTRIC AND POWER COMPANY SURRY NUCLEAR POWER STATION NO. 2 1991 ANNUAL STEAM GENERATOR INSERVICE INSEECTION REPORT l

VIRGINIA . ELECTRIC AND POWER COMPANY

?!A 288s 3!8888e1 R PDR

1 $

REFUELING OUTAGE - APRIL 1991

-SURRY ONIT 2 STEAM GENERATOR "A" EXAMINATION

SUMMARY

In "A" Steam Generator 1180 tubes were examined full length (tube end to tube end) with bobbin probes. This is approximately 35% of the available tubes. Of the tubes examined, two had indications i;etween 10% and 19% through wall, one had a indication between 20% and 29% through wall, five had indications brtween 30% and 39% through wall, two were characterized as " Manufacturing Buff Marks" and four were characterized ss " Indication Not Reportable " Refer to the table below for details.

No tubes were plugged as a resuit of this inspection. However, one tube (R41, C28) that was previously plugged was rcplugjed in response to NRC Bulletin 89-01 concerns. Another tube (R41, C27) previously plugged was deplugged, tested, and returneo to service.

Ind. Location Row-Column MBM 4H R36C20 32 7H R31C27 INR 6C R42C34 33 TSC R6C38 35 6C R12C39 32 6C R12C41 INR 6H R45C47 MBM 1C R45C48 30 3C R36C51 INR 7H R12CG3 INR AV4 R32C79 10 6C R11087 10 6C R12C87 25 1C R12C92 Page 1 of 2 l

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REFUELING OUTAGE - 1991 SURRY UNIT NO. 2, STEAM GENERATOR "C" EXAMINATION

SUMMARY

In "C" Steam Generator 1175 tubes were examined full length (tube end to tube end) with bobbin probes. This represents approximately 35% of the avaliable tubes.' Of the tubes examined, five had indications between 10% and 19% through wall, six had indications between 20% and 29% throu0n wall, ten had indications between 30%

and 39% through wall, and four were characterized as " Indication Not Reportable."

Refer to the table below for details.

Ind. Location Row-Columri 29 6H- R34C16 36 6C R18C18 s 31 6C R22C22 26 6H R14C26-30 AV4 - R43C31 37 50 R27C41 34 4H R27C41 33 SC R35C44 13 AV3 R46C48 27 AV4 R28049 35 6C' R45C53 19 AV3 R40C54 23 AS R17C56-17 5H R40CS2 13 6C R42C62 19 AV4 R40C63-21 2C R14C66 INR 3H R23C71 34 BPC RT8C82 32 3C R25C84 39- 3H R24C86 INR 7H R2C88 INH 7H R2C90 31- 3C R15C90 24 3H R12C91 INR 7H R2C92 Page 2 of 2

ATTACHMENT 2

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GLOSSARY OF TERMS SURRY POWER STATION ANNUAL STEAM GENERATOR -

INSERVICE INSPECTION REPORT 9

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- VIRGINIA ELECTRIC AND POWER COMPANY  ;

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o-V .

VIRGINIA ELECTRIC AND POWER. COMPANY i.

l ANNUAL STEAM GENERATOR REPORT EDDY CURRENT TUBE INSPECTION

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i Gl.OSSARY OF TERMS i

1) COI - Circumferentially Oriented Irdication - describes a circumferentially i oriented indication signal from Rotating Pancake probe data - eitner single or multiple signals - SCI or MCI will be used it it is possible to clearly detect the number of signnis present.

2) DI - Dit.torted indication -

a possible-tube wall loss condition that is 4

unquantifiable with a numeric percent call due to the existing signal characteristics,

3) INF - Indication Not Found indicv ;s that a previously reported Indication,

from current inspection data or historical (fala, is not found in the data being

analyzed - also used to address the case where a tube /signalis being retested

for positive identification (PID) and the retest data does not show any signal present.

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4) INR - Indication Not Reportable - indicates that a very small tube wall loss

{ condition exists in the data being analyzed that is below the reportable criteria 1

threshold for this specific inspection - can be used to address indications called-in previous inspections that are still detectable but fall below current criteria.

U l 5) MAI - Multiple AxialIndication - describes multiple axially oriented indication

signals from Rotating Pancake probe data.

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6) MCI -

Muitiple Circumferentially oriented Indication . - describes multiple.

circumferentially oriented indication signals from Rotating Pancake probe data l - COI is used if it is impossible to clearly cietect the number of signals prosent.

i) Pl - Possible Indication (retest) - generally used with_8x1 analysis, sometimesL with bobbin analysis - . describes a potential wall loss condition signal that typically requires a retest for verifit.aiion - sometimes retested with a special probe, e.g., MRPC, etc.

8) SAI - Single Axial Indication - describes a single axiany_orianted signal from Rotating Pancake probe data.

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

9) Cl -

Single Circumferentially oriented Indication -

describes a single circumferentially oriented indication signal from Rotating Pancake probe data -

COI is used if it is impossible to clearly detect the number of signals present.

10) 55 - A number in the indication column shows the % thru wall depth of the indication.

11) TEH - Tube Enu Hot leg.

12) TEC - Tube End Cold leg.

13) TSH - Top of Tubesheet Hot leg.

14) TSC - Top of Tubesheet Cold leg.

15) #C, #H - (# = number) of Support Plate Hot or Cold leg, e.g.,3H,6H,7C.

16) AV1, AV2, AV3, AV4 - Anti-Vibration Bars 1 thru 4.

17) MBM - Manufacturing Buff Mark - a tube wall loss condition due to a tube manufacturing process step - generally ~a long and shallow loss area - remains constant and does not present any operating problems for the-tube - noted for reference only.

'8) BPC - Baffie Plate Cold leg.

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