ML18153C548

Annual Steam Generator Inservice Insp Rept.

ML18153C548
Person / Time
Site:	Surry
Issue date:	02/25/1991
From:	VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:
Shared Package
ML18153C547	List: ML18153C546 ML18153C548
References
NUDOCS 9103040073
Download: ML18153C548 (11)

Text

• ATTACHMENT 1 SURRY POWER STATION UNIT 1 19 9 0 ANNUAL STEAM GENERA TOR INSERVICE INSPECTION REPORT VIRGINIA ELECTRIC AND POWER COMPANY

( 9103040073 910225  ;

PDR ADOCK 05000280 Q PDR

• ATTACHMENT 1 SURRY POWER STATION UNIT 1 REFUELING OUTAGE OCTOBER 1990 EDDY CURRENT EXAMINATION

SUMMARY

During the 1990 refueling outage for Surry Power Station Unit 1, the tubes in the "A," "B," and "C" steam generators were examined.

The material that follows presents the results of those examinations. These results include the number and extent of the tubes examined, location and characterization of each indication of an imperfection, and the identification of the tubes that were plugged. Attachment 2 to this letter provides a glossary of terms (abbreviations) used.

• Attachment 1 Page 2 of 8 SURRY POWER STATION UNIT 1 REFUELING OUTAGE OCTOBER 19 9 0 EDDY CURRENT EXAMINATION

SUMMARY

STEAM GENERATOR "A" In "A" Steam Generator, 203 tubes were examined with bobbin probes. Of these, 152 were examined full length (tube end to tube end), four were examined from the seventh support plate on the inlet side to the tube end on the inlet side, one was examined from the third support plate on the inlet side to the tube end on the inlet side, 27 were examined from the second support plate on the inlet side to the tube end on the inlet side and 19 were examined from the first support plate on the inlet side to the tube end on the inlet side. This is approximately six percent of the available tubes. In addition, all open tubes were examined at the inlet tubesheet (+/- 3") with a MRPC probe. Of the tubes examined, three had indications less than 19% through wall, one had a indication between 20% and 29% through wall, one had a indication between 30% and 39% through wall, one was characterized as a "possible indication," eight were characterized as "manufacturer's burnish marks," and 125 were characterized as "indication not reportable." No tubes were plugged. Refer to the table below for details.

%TWD Location Row-Column Remarks INR lC R23C08 INR 6H R09Cl0 INR 2C R29C12 INR 3H R09Cl3 INR 4H R25C13 INR TSH R06Cl4 INR 5C Rl0Cl6 INR BPH Rl0C16 INR 3H R02Cl8 INR 4H R20C18 INR 3H R33Cl8 INR 5H Rl4C19 INR lH R22Cl9 INR lH Rl5C20 INR lH Rl9C21 INR 2H Rl9C21 INR 2H R21C22 INR 6H Rl5C23 INR 4H Rl9C24 INR lC R21C25 MBM 6H R15C27 INR TSH Rl5C28 INR lC R21C28 INR 6C R22C28

-- - - ----==--=~~--- -- - - - - - - - - - ~

• Attachment 1 Page 3 of 8 SURRY POWER STATION UNIT 1 STEAM GENERATOR "A"

%TWD Location Row-Column Remarks INR lH R04C30 INR SH R16C30 INR TSH R19C30 INR lC R13C31 INR lH R20C31 INR SH R42C31 INR 6H R43C32 INR 6C Rl3C33 INR 4H R23C33 INR lC Rl2C34 INR TSH R03C36 INR 2H R09C36 INR 7H R22C36 INR 7H R22C37 INR lH R34C37 INR 4H R34C37 INR BPH R29C38 INR 6C R34C38 INR lH R44C38 INR 2H R12C40 27 AV4 R28C41 INR 7H R28C42 INR 6C R28C42 INR 4H R34C42 INR 4H R36C42 INR 6H R36C42 INR 6C R44C42 INR 7H R28C43 INR 3C R34C43 INR lH R24C44 INR 3C R41C44 17 AVl R46C44 INR 6C R23C4S INR 6C R2SC4S INR 2C R28C4S INR 6H R29C4S INR 3H R36C4S 17 AVl R46C4S INR lC R21C46 MBM TSC R21C46 INR 4H R26C46 INR SH R26C46 INR 4C R07C47 INR 4H R23C47 INR BPC R32C47 INR 6C R4SC47 INR 4C R08C48 INR SC R40C48

- - --=- - -

Attachment 1 Page 4 of 8 SURRY POWER STATION UNIT 1 STEAM GENERATOR "A"

%TWD Location Row-Column Remarks INR TSH R42C48 INR 2C Rl6CSO INR SC R41CSO INR 4C R21CS1 INR 6H

• R31CS1 INR TSC RllCSS MBM 4H R36CS6 MBM 6H R36CS6 MBM 4C R39CS6 INR SH R43CS6 PI TSH R19CS7 INR TSH R3SCS7 INR 4C R3SCS7 INR 6C R41CS7 INR 7C R4SCS7 MBM SH R20CS8 INR BPC R24CS8 INR 3H R41CS8 INR 3H R44CS8 INR 4H R44CS8 INR 6H R44C58 INR 4C R15C59 INR AV4 R34C59 INR 7C R44CS9 INR 2H R27C60 INR 3C R27C60 INR AV4 R34C60 INR 2H R12C61 INR 2H R13C61 INR 6H R17C61 INR 7C R38C61 INR 6H R04C63 INR 7H Rl9C63 INR AV4 R21C64 INR SH R41C64 INR 4C R25C65 INR 3C R25C6S INR AV4 R39C6S MBM AV2 R40C6S INR 4H R42C65 INR 3H R40C66 INR 4H Rl6C67 INR TSH R27C67 INR 6C R21C68 INR 2H R08C69 INR AV4 Rl3C69 INR 7C R28C69 INR SH R31C69

• Attachment 1 Page 5 of 8 SURRY POWER STATION UNIT 1 STEAM GENERATOR "A"

%TWO Location Row-Column Remarks INR 6H R31C70 INR 7C R31C70 INR 4C R20C71 INR 4C R35C71 30 6C R31C73 INR 5C R34C76 INR lC R07C77 INR 3H RllC79 MBM 6C Rl5C79 INR TSH R31C79 INR AV4 R31C79 INR lH R05C80 INR TSH R21C80 INR 6C R24C80 INR 4C R32C81 INR lC R24C83 INR BPC R30C83 INR lH R01C84 INR lC R28C84 INR 2H R02C28 INR 5H Rl6C86 INR 6H Rl6C86 INR 6C R24C86 INR AV2 R20C87 INR 7C R21C87 INR SC R21C87 INR 2C Rl9C88 MBM 3H R22C88 INR TSH R08C89 INR BPH R20C89 10 TSC R07C90 INR SH R14C90 INR 7C Rl4C90 INR BPH R03C91 INR BPC Rl2C92

• Attachment 1 Page 6 of 8 SURRY POWER STATION UNIT 1 REFUELING OUTAGE OCTOBER 19 9 0 EDDY CURRENT EXAMINATION

SUMMARY

STEAM GENERATOR "B" In "B" Steam Generator, 911 tubes were examined with bobbin probes. Of these, 19 were examined from the second support plate on the inlet side to the tube end on the inlet side, 11 tubes were examined from the first support plate on the inlet side to the tube end on the inlet side and 881 tubes examined full length (tube end to tube end). This is approximately 27 percent of the available tubes. In addition, all open tubes were examined at the inlet tubesheet (+/- 3") with a MRPC probe. Of the tubes examined, one had a indication between 30% and 39% through wall, four had indications between 20% and 29% through wall, two had indications less than 19% through wall, one was charcterized as a "possible indication," three were characterized as "manufacturer's burnish mark," and three were characterized as "indication not reportable." No tubes were plugged as a result of the inservice inspection. However, two tubes that were previously plugged were replugged (Rl1C14 and R33C43) in response to NRC Bulletin 89-01 concerns. Refer to the table below for inspection details.

%TWD Location Row-Column Remarks 13 TSC R27C15 24 AV4 R34C17 15 AV3 R35C17 29 6C R17C23 MBM 7H R43C37 28 6C R36C38 MBM 2H R36C38 INR TSH R07C39 MBM 3C R04C40 MBM 6C R19C41 MBM 7C R19C41 22 6C R11C43 INR TSH R42C44 31 TSC R45C48 INR 6C R46C52 PI TSH R26C75

• Attachment 1 Page 7 of 8 SURRY POWER STATION UNIT 1 REFUELING OUTAGE OCTOBER 19 9 0 EDDY CURRENT EXAMINATION

SUMMARY

STEAM GENERATOR "C" In "C" Stearn Generator, 1302 tubes were examined with bobbin probes. Of these, two were examined from the second support plate on the inlet side to the tube end on the inlet side, 51 tubes were examined from the first support plate on the inlet side to the tube end on the inlet side, three tubes examined from the baffle plate on the inlet side to the tube end on the inlet side and 1246 tubes were examined full length. (tube end to tube end). This is approximately 39 percent of the available tubes. In addition, all open tubes were examined at the inlet tubesheet (+/- 3") with a MRPC probe. Of the tubes examined, three had indications between 30% and 39% through wall, three had indications between 20% and 29% through wall, five had indications less than 19% through wall, three were characterized as "possible indication," four were characterized as "manufacturer's burnish mark," and eighteen were characterized as "indication not reportable." Two tubes (R10C53 and R25C57) were pulled for evaluation of axial and circumferential anomalies at the top of the tube sheet and were subsequently plugged. The results of the evaluation indicated no operationally induced degradation of the tube wall. Also, two tubes that were previously plugged were replugged (R02C07 and R40C70) in response to NRC Bulletin 89-01 concerns. Re£er to the table below for inspection details.

%TWO Location Row-Column Remarks 20 2C R25Cll INR TSH R08C14 MBM 3H R06C16 INR TSH R34C16 14 2C R26C22 INR SH R31C27 INR SC R34C33 INR AV4 R25C36 14 6H R16C37 INR TSH R20C40 33 6H R39C40 MBM lC R43C40 INR TSH R37C41 INR TSH R20C42 37 TSH Rl7C44 17 6H R38C44 INR 6C RlOC52 16 2H R24C53 INR TSH Rl0C57

• Attachment 1 Page 8 of 8 SURRY POWER STATION UNIT 1 STEAM GENERATOR "C"

%TWD Location Row-Column Remarks 31 4H R23C59 INR TSH R31C60 MBM 4H R39C61 INR TSH R03C64 INR TSH R40C67 PI TSH R07C68 PI TSH R30C69 INR 2C R08C73 INR TSH R10C77 PI TSH R07C79 18 AV4 R15C81 INR TSH R28C82 INR TSH R30C83 INR TSH R08C89 MBM 2C Rl3C91 24 2C Rl3C92 29 TSH R04C94

I I

I ATTACHMENT 2 GLOSSARY OF TERMS SURRY POWER STATION ANNUAL STEAM GENERATOR INSERVICE INSPECTION REPORT VIRGINIA ELECTRIC AND POWER COMPANY

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

1) INR - INDICATION NOT REPORTABLE - This condition is characterized by data indicating small tube wall loss that is below the reportable criteria threshold for the specific inspection method used. This indication type can be comparatively used to address indications identified in previous inspections that are still detectable but fall below current criteria.

2) MBM - MANUFACTURING BURNISH MARK - This condition is characterized by a tube wall loss due to a manufacturing process step. This type of indication is generally a relatively long shallow loss area which remains constant and does not present any operating problems for the tube. These indications are noted for reference only.

3) PI - POSSIBLE INDICATION (retest) - This condition is generally associated with 8xl analysis or sometimes with bobbin analysis. This type of indication describes a potential wall loss condition signal that typically requires a retest for verification. Verification testing is sometimes retested with a special probe, e.g., MRPC, etc.

4) TEH Tube End Hot leg.

5) TEC Tube End Cold leg.

6) TSH Top of Tubesheet Hot leg.

7) TSC Top of Tubesheet Cold leg.

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

9) AVl, AV2, AV3, AV4 Anti-Vibration Bars 1 thru 4.

10) BPH BAFFLE PLATE HOT Note: Where no comment appears in the remarks column the tube is still in service.