ML20147D958

Forwards Results of Steam Generator Tube 880301 Inservice Insp.Results Indicated That All Wall Penetrations Were non-service Induced & No Growth Detected

ML20147D958
Person / Time
Site:	Sequoyah
Issue date:	03/01/1988
From:	Gridley R TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
NUDOCS 8803040210
Download: ML20147D958 (17)

Text

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TENNESSEE VALLEY AUTHORITY CH ATTANOOGA. TENNESSEE 374ot SN 1578 Lookout Place MAR 011988 i

U.S. Nuclear Regulatory Commission ATTN:

Document Control Desk Washington, D.C.

20555 Gentlemen:

In the Matter of

)

Docket No. 50-327 Tennessee Valley Authority

)

SEQUOYAH NUCLEAR PLANT (SQN) - IN-SERVICE INSPECTION OF UNIT 1 STEAM GENERATOR TUBES - REPORT OF RESULTS

References:

1.

TVA letter to Stcwart Ebneter dated March 16, 1987, "Sequoyah Nuclear Plant - Additional Information Regarding Steam Generator Tube Stress Relief - U-Bend Heat Treatment" l

2.

J. A. Domer's letter to Stewart Ebneter dated March 13, 1987, "Sequoyah Nuclear Plant (SQN) Unit 1 -

Steam Generator (S/G) Tube ra,gging Following 4

Inservice Inspection" k

l As required by SQN unit 1 technical specification 4.4.5.5, enclosed are the results of the steam generator tube in-service inspection completed J

on unit 1 March 1, 1987. The in-service inspection was performed on l

steam generator No. 1 in order to comply with the technical specification increction interval requirements without interrupting the next fuel i

cycle.

It was performed in conjunction with the heat treatment of row Nos. 1 and 2 U-bends for all four steam generators.

f Unit I has not been operated since a 100-percent inspection was performed. Therefore, only 427 tubes in steam generator No. I were examined full length. The selection of tubes for examination was based on past SQN and industry experience. All nonplugged tubes in steam j

generator No. I with previously detected wSil penetrations were also i

1 examined. The results indicated that all of these penetrations were nonservice induced, and no growth was detected.

d In preparation for heat treatment, the plugs were removed from previously plugged row No. I tubes in all four unit 1 steam generators. The U-bend regions of all row Nos. I and 2 tubes were heat treated as described in reference 1.

Post-heat-treatment eddy current examinations were performed, and 12 tubes were replugged. The replugged tubes were previously identified to NRC in reference 2.

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8803040210 880301

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PDR ADOCK 05000327 P

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DCD

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An Equal Opportunity Employer

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i j U.S. Nuclear Regulatory Commission-0 1 1988 If you have any questions, please telephone Kathy S. Whitaker at I

(615) 870-7740.

i Very truly yours, TENN SSEE VALL Y AUTHORITY

/

R. G diey, Di ector L

Nuclear Licen ng and Regulatory ffairs Enclosure j

cc (Enclosure):

i Mr. X. P. Barr, Acting Assistant Director for Inspection Programs 1

TVA Projects Division i

U.S. Nuclear Regulatory Commission Region II 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323 i

Mr. C. G. Zech, Assistant Director for Projects i

TVA Projects Division U.S. Nuclear Regulatory Commission i

One White Flint, North 11555 Rockville Pike Rockville, Maryland 20852 I

Sequoyah Resident Inspector Sequoyah Nuclear Plant 2600 Igou Ferry Road 2

Soddy Daisy, Tennessee 37379 h

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s ENCLOSURE SEQUOYAH UNIT 1 CYCLE 3A INSPECTION MARCH 1987 STEAM GENERATOR (S/G) INSPECTION RESULTS

• \\

SEQUOYAH UNIT 1 CYCLE 3A INSPECTION MARCH 1987 l

S/G INSPECTION RESULTS CONTENTS TABLE 1 INSPECTION

SUMMARY

TABLE 2 S/G 1 INSPECTION

SUMMARY

TABLE 3 S/G 2 INSPECTION

SUMMARY

TJ3LE 4 S/G 3 INSPECTION

SUMMARY

TABLE 5 S/G 4 INSPECTION

SUMMARY

MAP 1 TUBE SHEET MAP OF S/G 1 TUBES EXAMINED MAP 2 TUBE SHEET MAP OF S/G 2 TUBES EXAMINED MAP 3 TUBE SHEET MAP OF S/G 3 TUBES EXAMIN.'D MAP 4 TUBE SHEET MAP OF S/G 4 TUBES EXAMINEl TABLE 6 INDICATIONS TABLE 7 TUBES REPLUGGED DURING CYCLE 3A INSPECTION i

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TABLE 1 l

l

_SEQUOYAH UNIT 1 CYCLE 3A INSPECTION I

-MARCH 1987 i

I INSPECTION

SUMMARY

S/G 1 S/G 2 S/G 3 S/G 4 TOTAL EXAMINATIONS 817 383 377

.386 1

TUBES RECORDING DEFECTS 0

0 0

0 (140% WALL LOSS)

-l TUBES RECORDING DEGRADATIONS 1-0 0

0 (120% to <40% WALL LOSS) i TUBES RECORDING IMPERFECTIONS 3*

1 0

0 i

(<20% WALL LOSS) i TUBES RECORDING NONQUANTIFIABLE 5

3 3

1 PERCENT WALL LOSS h

Total number of imperfections is four; total number of tubes with imperfections is three.

S/G 1, tube row 37, column 20. has two l

1ess-than-20-percent wall loss indications.

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TABLE 2 SEQUOYAH UNIT 1 l

CYCLE 3A INSPECTION MARCH 1987 S/G 1 INSPECTION SLWtARY AMERICAN SOCIETY OF MECHANICAL ENGINEERS NUMBER OF TUBES (ASME) CODE CREDIT EXAMS FULL-LENGTH GENERAL DEFECT EXAMS Cold tube end to hot tube end 427 REINSPECTION OF NONPLUGGED TUBES WITH PREVIOUS INDICATIONS Hot seventh support plate to hot tube end 9

TOTAL ASME CODE CREDIT TUBE EXAMS 436 NOP-ASME CODE CREDIT EXAMS NUMBER OF EXAMS SPECIAL ROW 1 & 2 U-BEND REGION EXAMS Cold seventh support plate to hot 183 sixth support plate l

Cold U-bend transition to hot sixth 4

support plate Cold U-bend transition to hot seventh 1

i support plate GENERAL DEFECTS EXAMS NON-ASME CODE CREDIT Cold seventh support plate to hot 188 sixth support plate Hot first support plate to hot tube end 5

TOTAL NON-ASME CODE CREDIT EXAMS 381 l

TOTAL EXAMS CONDUCTED IN S/G 1 817 J

I

TABLE 2 Continued SEQUOYAH UNIT 1 CYCLE 3A INSPECTION MARCH 1987 S/G 1 INSPECTION

SUMMARY

(Continued)

INDICATIONS NL*MBER OF TUBES TUBES RECORDING DEFECTS 0

(140% WALL LOSS)

TUBES RECORDING DEGRADATIONS 1

(120% TO <40% WALL LOSS)

TUBES RECORDING IMPERFECTIONS 3*

(<20% WALL LOSS)

TUBES RECORDING NONQUANTIFIABLE 5

PERCENT WALL LOSS INDICATIONS Total number of imperfections is fourt total number of tubes with imperfections is three. Tube row 37 column 20, has two less-than-20-percent wall loss indications.

TABLE 3 SEQUOYAH UNIT 1 CYCLE 3A INSPECTION MARCH 1987 S/G 2 INSPECTION SDD!ARY NON-ASME CODE CREDIT EXAMS NUMBER OF EXAMS SPECIAL ROW l AND 2 U-BEND REGION EXAMS Cold seventh,upport plate to hot 186 sixth support plate Hot seventh support plate to cold sixth 2

support plate GENERAL DEFECT EXAMS NON-ASME CODE CREDIT Cold seventh support plate to hot sixth 186 support plate Hot seventh support plate to cold sixth 1

support plate Cold seventh support plate to cold tube end 1

Hot first support plate to hot tube end 7

TOTAL NON-ASME CODE CREDIT EXAMS 383 INDICATIONS NUMBER OF TUBES TUBES RECORDING DEFECTS 0

(140% WALL LOSS)

TUBES RECORDING DEGRADATIONS 0

(120% TO <40% WALL LOSS)

TUBES RECORDING IMPERFECTIONS 1

(<20% WALL LOSS)

TUBES RECORDING NONQUANTIFIABLE 3

PERCENT WALL LOSS INDICATIONS 1

TABLE 4 SEQUOYAH UNIT 1 CYCLE 3A INSPECTION MARCH 1987 S/G 3 INSPECTION

SUMMARY

.?.'ON-ASME C0_DE CREDIT EXAMS NUMBER OF EXAMS SPECIAL ROW l AND 2 U-BEND REGION EXAMS flo t seventh support plate to cold 1

sixth support plate Cold seventh support plate to hot sioth 184 rupport plate Cold U bend transition to hot sixth 3

suppert plate GENERAL DEFECT EXAMS NON-ASME CODE CREDIT Cold seventh support plate to hot 186 sixth support plate Hot seventh support plate to cold sixth 1

support plate Hot first support plate to hot tube end 2

TOTAL NON-ASME CODE CREDIT EXAMS 377 INDICATIONS NUMBER OF TUBES TUBES RECORDING DEFECTS 0

(140% WALL LOSS)

TUBES RECORDING DEGRADATIONS 0

(120% To (40% WALL LOSS)

TUBES RECORDING IMPERFECTIONS 0

(<20% WALL LOSS)

TUBES RECORDING NONQUANTIFIABLE 3

PERCENT WALL LOSS INDICATIONS

TABLE $

SEQUOYAH UNIT l CYCLE 3A INSPECTION MARCH 1987 S/G 4 INSPECTION

SUMMARY

NON-ASME CODE CREDIT EXAMS NUMBER OF EXAMS SPECIAL R0W l & 2 U-BEND REGION EXAMS Cold seventh support plate to hot sixth 187 support plate Cold seventh support plate to hot seventh 1

support plate GENERAL DEFECT EXAMS NON-ASME CODE CREDIT Cold seventh support plate to hot sixth 188 support plate Hot seventh support plate to hot tube end 10 TOTAL NON-ASME CODE CREDIT EXAMS 386 INDICATIONS NUMBER OF TUBES TUBES RECORDING DEFECTS 0

(1 0% WALL LOSS) 4 TUBES RECORDING DEGRADATIONS 0

(120% TO <40% WALL LOSS)

TUBES RECORDING IMPERFECTIONS 0

(<20% WALL LOSS)

TUBES RECORDING NONQUANTIFIABLE 1

, PERCENT WALL LOSS INDICATIONS l

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TABLE 6 SEQUOYAH UNIT 1 CYCLE 3A INSPECTION MARCH 1987 INDICATIONS STEAM GENERATOR 1 INDICATION PERCENT INDICATION R0W COLUMN DESCRIPTION WALL LOSS LOCATION 1

1 22 HTS + 17.0 1

17 IST (NOTE 1)

H07 + 12.0 1

20 IST (NOTE 1)

C07 + 7.9 1

61 IST (NOTE 1)

C07 + 4.7 1

69 IST (NOTE 1)

HC7 + 5.9 J

1 81 IST (NOTE 1)

H07 + 10.2 2

44 8

H02 + 3.3 9

69 11 H01 + 31.9 37 20 10 CO2 + 31.6 37 20 7

C03 + 12.4 STEAM GENERATOR 2 1

22 1

C04 + 18.6 1

43 IST (NOIZ 1)

C07 +

2.4 1

45 IST (NCIE 1)

C07 + 4.4 1

63 1PT (NOTE 1)

H07 +

2.2 STEAM GENERATOR 3 1

45 IST (NOTE 1)

C07 + 4.3 1

84 IST (NOTE 1)

C07 + 4.3 1

86 1PT (NOTE 1)

C07 + 3.6 STEAM GENERATOR 4 1

88 IST (NOTE 1)

H07 + 5.2 NOTE 1:

IST's and 1PT's are nenquantifiable percent wall loss indications detected utilizing the Combustion Engineering row 1 probe.

4

ma TABLE 6' SEQUOYAH UNIT 1 CYCLE 3A INSPECTION-MARCH 1987

-INDICATIONS-(Continued)

DESCRIPTION OF INDICATIONS IST A suspected degradation of nonquantifiable percent wall loss has been detected. ' Data was collected utilizing a Combustion Engineering row 1 probe.

IPT A degradation of nonquantifiable percent wall loss has been detected. Data was collected utilizing a Combustion Engineering row 1 probe.

LOCATION ABBREVIATIONS Hot Tube End HTE Hot Leg Tabe Sheet (secondary side surface)

HTS First Hot Leg Support Plate H01 Second Hot Leg Support Plate H02 Third Hot Log Support Plate H03 Fourth Hot Leg Support Plate H04 Fifth Hot Leg Support Plate H05 Sixth Hot Leg Support Plate H06 Seventh Hot Leg Support Plate H07 Hot U-bend Transition HTR APEX of U-bend APEX-Cold U-bend Transition CTR Seventh Cold Leg Support Plate 007 Sixth Cold Leg Support Plate C06 Fifth Cold Leg Support Plate C05 Fourth Cold Leg Support Plate C04 Third Cold Leg Support Plate C03 Second Cold Leg Support Plate CO2 First Cold Leg Support Plate C01 Cold Leg Tube Sheet (secondary side surface)

CTS Cold Tube End CTE i

1 1,

TABLE.7-SEQUOYAH UNIT 1 i.,,..

CYCLE 3A'INSPECTI'ON'

~ MARCH 1987 TUBES REPLUGGED-DURING UNIT 1 CYCLE.3A. INSPECTION ~

S/G ROW' COLUMN 1.

1 17-1 1

20 1

1

-61 1

1 69 1

1 81 2

1 43 2

1 45 2

1 63 3

1 45 3

1 84 3

1-86 t

4 1

gg L

4 f

5 1

t i

e d

1

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I

.~

-