ML20215G992

Forwards Info Re Performance of NDE of Feedwater Nozzles & safe-end Welds During Fall 1986 Maint/Refueling Outage,Per NUREG-0619.Results of Previous Exams Provided in 850305 & 1125 Ltrs

ML20215G992
Person / Time
Site:	Hatch
Issue date:	06/12/1987
From:	Gucwa L GEORGIA POWER CO.
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
RTR-NUREG-0619, RTR-NUREG-619 SL-2621, TAC-64777, NUDOCS 8706230475
Download: ML20215G992 (12)

Text

- _ _ _ _ _ _ _ _ _

Georgia Power Cornpany

. 333 Piedrnont Avenue.

g*

Atlanta Georgia 30308 Telephone 404 526-6526 Mailing Mdress:

Post office Box 4545 AtIanta, Georgia 30302 h

Georgia Power l

L T. Gucwa the soutnem electnc system Manager Nuclear Safety and Licensing 1401C X7GJ17-H220 L

l 1

June 12, 1987 U. S. Nuclear Regulatory Commission I-ATTN:

Document Control Desk l

Hashington, D. C.

20555 PLANT HATCH - UNIT 2 NRC DOCKET 50-366 OPERATING LICENSE NPF-5 PERFORMANCE OF NONDESTRUCTIVE EXAMINATION OF FEEDHATER N0ZZLES AND SAFE-END HELDS DURING THE 1986 MAINTENANCE / REFUELING OUTAGE Gentlemen:

Pursuant to NRC NUREG-0619, subsection 4.4.3.1(2), Georgia Power Company (GPC) hereby submits the enclosed information concerning the nondestructive examination of the feedwater nozzles and safe-end welds performed during the Fall 1986 maintenance / refueling outage at Plant Hatch Unit 2.

Enclosure 1

provides information relative to startup/ shutdown cycles experienced, examination methods and results, future cracking tendencies and on-line leakage monitoring.

presents a summary of the examination results.

The results of previous Unit 2 feedwater component examinations performed in accordance with NUREG-0619 were provided to the NRC in GPC letters NED-85-112, dated March 5,1985, and SL-85-38, dated November 25, 1985.

Consequently, the earlier examination results are only referenced and are not included in this submittal.

Should you have any questions in this regard, please contact this office at any time.

Sincerely, 8706230475 870612

1. FA w PDR ADOCK 05000366 P

PDR L. T. Gucwa GKM:lc

Enclosure:

1.

Performance of Nondestructive Examination of Feedwater Nozzles and Safe End Helds During the 1986 Maintenance / Refueling Outage 2.

Feedwater Nozzle and Safe End Nondestructive Examination Results Summary c:

(See next page)

I.

,,y.

3,

. Georgia Power A U. S. Nuclear Regulatory Commission June.12, 1987 Page Two c: Georgia Power Comoany Mr._J..P. 0.'Reilly Mr. J. T. Beckham, Jr.

G0-NORMS LLS. Nuclear Reaulatory Commission. Hashinaton Mr. L. P. Crocker.. Licensing Project Manager - Hatch U.S. Nuclear Reaulatory Commission. Reaion II Mr. P. Holmes-Ray, Senior Resident Inspector. Hatch f

o

)

1401C

• ~

(k 5 i 700.75 -

)

k l

Georgia Power h ENCLOSURE 1 PLANT HATCH - UNIT 2 NRC DOCKET-50-366-OPERATING LICENSE NPF-5 PERFORMANCE OF NONDESTRUCTIVE EXAMINATION OF FEEDWATER N0ZZLES AND SAFE-END HELDS DURING THE FALL 1986 MAINTENANCE / REFUELING OUTAGE 1

The following information is provided in accordance with NRC NUREG-0619, i

"BHR Feedwater Nozzle and Control Rod Drive Return Line Nozzle Cracking,"

and pertain to the nondestructive examination (NDE) of feedwater nozzles and. safe-end welds performed at Georgia Power Company's (GPC) Plant Hatch Unit 2 during the Fall 1986 maintenance / refueling outage.

I.

Startuo/ Shutdown Cycles Exoerienced When Unit 2 was shut down in September 1986 for maintenance and refueling, _113 startup/ shutdown cycles had been experienced.

Twenty-two startup/ shutdown cycles have elapsed since the feedwater nozzles and safe-end welds were last examined during the 1984 maintenance / refueling outage.

II.

Nondestructive Examination Results provides a summary of the examination results for the feedwater nozzles and safe-end weld examinations conducted at Unit 2 during the Fall 1986 maintenance / refueling outage.

Note that in some cases the examinations were limited due to the configuration of the component weld.

No significant indications or evidence of cracking were noted during the performance of any of the examinations.

The scheduled visual examinations of feedwater spargers 2N4A, B, C, and D were performed in accordance with Table 2 of NUREG-0619, and included the sparger flow holes and accessible welds.

The visual examinations were performed using remote camera equipment and were performed per Hatch Procedure 42SV-B11-001-2S.

The scheduled external ultrasonic (UT) examinations of the 2N4A, B,

C and D feedwater nozzle safe-end configuration welds (pipe-to-transition piece weld and transition piece-to-nozzle weld), nozzle center bore

sections, and nozzle inner-blend radii were also performed in accordance with Table 2 of NUREG-0619.

In addition to the UT examinations, a required ASME Code,Section XI surface examination was performed on the safe-end configuration welds.

Figures A-1, f

A-10, and A-11 (see Enclosure 2), from the Plant Hatch Unit 2 I

Long-Term Inservice Examination

Plan, depict the nozzle and l

safe-end areas examined.

The results of previous Unit 2 feedwater 1401C El-1 6/12/87 SL-2621 700775

~

k Georgia Power n l

ENCLOSURE 1 (Continued) l PERFORMANCE OF NONDESTRUCTIVE EXAMINATION OF FEEDHATER N0ZZLES AND SAFE-END HELDS DURING THE FALL 1986 MAINTENANCE / REFUELING OUTAGE

{

II.

Nondestructive Examination Results (Con't) l l

component examinations were provided to the NRC in GPC letters NED l

85-112, dated March 5,

1985, and SL-85-33, dated November 25, 1985.

Consequently, the earlier examination results are only I

(

referenced and are not included herein.

1 III.

Nondestructive Examination Methods The NDE methods employed for the examination of the subject feedwater components during the Unit 2 1986 maintenance / refueling outage were:

I 1.

Manual ultrasonic.

i l

2.

Visual.

I 3.

Magnetic particle (MT).

4.

Liquid penetrant (PT).

1 Ultrasonic scans of 30-degree shear were performed on each nozzle center bore section.

A 70-degree shear UT scan was performed on the inner-blend radius of each nozzle.

Safe-end welds were l

ultrasonically examined using a 45-degree shear scan.

In addition, l

a magnetic particle or liquid penetrant surface examination was performed on the safe-end welds. references the examination procedures employed.

The subject NDE procedures are i

available at the Plant Hatch site for review by NRC personnel upon I

request.

IV.

Effects on Prediction of Future Crackina Tendencies No particular design or procedural changes relative to predicting future cracking tendencies, based upon past history, have been implemented at Plant Hatch Unit 2.

At times, the unit may operate at reduced power levels due to various circumstances (e.g.,

out-of-service feedwater heaters, turbine bucket removals, etc.)

which, as expected, affect plant operating parameters.

V.

On-Line Leakaoe Monitorina i

An on-line leakage monitoring system used to detect feedwater leakage, which could result in nozzle cracks (as described in NUREG-0619), is not installed on Unit 2 and, therefore, is not applicable to this report.

1401C El-2 6/12/87 SL-2621 l

700775

GeorgiaPower A l

. ENCLOSURE 2

. PLANT HATCH - UNIT 2

NRC DOCKET 50-366 OPERATING LICENSE NPF-5 FEEDHATER N0ZZLE AND SAFE-END NONDESTRUCTIVE EXAMINATION RESULTS

SUMMARY

FALL 1986 MAINTENANCE / REFUELING OUTAGE Component Examination Procedure Examination Identification Techniaue-Used Results 2N4A, B, C, D Remote Hatch Visual examination i

Feedwater spargers visual

-42SV-B11-001-2S, of feedwater sparger Rev. 0 (2N4C) at the AZ 45' SCS-revealed a gouge VT-H-710, across the lip of Rev. 1 the spray nozzle opening. After analy-

sis, the data was-compared-with the 1985 data. The indi-cation has not grown in length or-in depth.

Feedwater nozzles will continue to be examined per NUREG-0619.

l 2N4A, B, C, D UT SCS No significant Nozzle center UT-H-481, indications.

(

bore sections Rev. 0

]

2N4A, B, C, D UT SCS No significant Nozzle inner-UT-H-480, indications.

blend radii Rev. 1 2B21-1FH-12AA-7 UT/MT SCS No significant '

Pipe to transition UT-H-400, Rev. 6 indications, piece MT-H-500, Rev. 2 1401C E2-1 6/12/87 SL -262 '

70775

c, GeorgiaPower A ENCLOSURE 2 (Continued)

FEEDHATER N0ZZLE AND SAFE-END' NONDESTRUCTIVE EXAMINATION RESULTS

SUMMARY

FALL 1986 MAINTENANCE / REFUELING OUTAGE Component.

Examination Procedure Examination Identification Techniaue Used Results 2821-lFH-12AA-8 UT/PT SCS No significant

-Transition piece UT-H-409, Rev. 1 indications.

to safe-end PT-H-600, Rev. 2 extension 2821-1FH-12AA-9

'UT/PT SCS No significant Safe-end extension UT-H-400, Rev. 6 indications, to safe-end

.PT-H-600,'Rev. 2 2821-lFH-12AA-10 UT/PT SCS' No significant Safe-end to UT-H-409, Rev. 1 indications.

transition piece PT-H-600, Rev. 2 2821-lFH-12AA-11 UT/MT SCS No significant Transition piece UT-H-400, Rev. 6 indications.

to transition MT-H-500, Rev. 2 piece 2821-1FH-12AA-12 UT/MT SCS' Held contains a Transition piece UT-H-400, Rev. 6 previously reported to nozzle MT-H-500, Rev. 2 indication which has not grown in length or in depth.

2B21-1FH-12AB-10 UT/MT SCS No significant Pipe to transition UT-H-400, Rev. 6 indications.

piece-MT-H-500, Rev. 2 2821-1 FH-12AB-11 UT/PT SCS No significant Transition piece UT-H-409, Rev. 1 indications.

to safe-end PT-H-600, Rev. 2 extension 1401C E2-2 6/12/87 SL-2621 700776

s k

Georgia Power n ENCLOSURE 2 (Continued)

FEEDHATER N0ZZLE AND SAFE-END NONDESTRUCTIVE EXAMINATION RESULTS

SUMMARY

FALL 1986 MAINTENANCE / REFUELING OUTAGE Component Examination Procedure-Examination Identification Techniaue Used Results i

2B21-1FH-12AB-12 UT/PT SCS Initial PT exam Safe-end extension UT-H-400, Rev. 6 revealed several to safe-end PT-H-600, Rev. 2 linear indications.

After

buffing, the area was re-examined and. found to be acceptable.

2B21-1FH-12AB-13 UT/PT SCS Initial PT exam

-Safe-end to UT-H-409, Rev. 1 revealed several transition piece PT-H-600, Rev. 2 linear indications.

After

buffing, the area was re-examined and found to be acceptable.

2821-1FH-12AB-14 UT/MT SCS No significant Transition piece UT-H-400, Rev. 6 indications.

to transition MT-H-500, Rev. 2 piece UT-H-460, Rev. 1 2821-1FH-12AB-15 UT/MT SCS No significant Transition piece UT-H-400, Rev. 6 indications.

to nozzle MT-H-500, Rev. 2 UT-H-460, Rev. 1 2B21-1FH-12BC-10 UT/MT SCS No significant Pipe to transition UT-H-400, Rev. 6 indications.

piece MT-H-500, Rev. 2 2B21-1FH-12BC-11 UT/PT SCS No significant Transition piece UT-H-409, Rev. 1 indications, to safe-end PT-H-600, Rev. 2 extension 1401C E2-3 6/12/87 J

SL-2621 mm j

beorgiaPowerA l

l ENCLOSURE 2 (Continued) l l

4 i

'FEEDHATER N0ZZLE AND SAFE-END l

NONDESTRUCTIVE EXAMINATION RESULTS

SUMMARY

FALL 1986 MAINTENANCE / REFUELING OUTAGE I

Component Examination Procedure Examination Identification Techniaue Used Results l

2B21-1FH-12BC-12 UT/PT SCS No significant Safe-end UT-H-400, Rev. 6 indications.

extension to PT-H-600, Rev. 2 safe-end 2B21-1FH-12BC-13 UT/PT SCS No significant j-

. Safe-end to' UT-H-409 Rev. 1 indications.

transition piece PT-H-600 Rev. 2 2B21-1FH-12BC-14 UT/MT SCS No significant Transition piece UT-H-400, Rev. 6 indications.

to transition piece MT-H-500, Rev. 2 2B21-lFH-12BC-15 UT/MT SCS No significant Transition piece UT-H-400, Rev. 6 indications.

to nozzle MT-H-500, Rev. 2 2B21-1 FH-12BD--7 UT/MT SCS No significant Pipe to UT-H-400, Rev. 6 indications.

transition piece MT-H-500, Rev. 2 l

2821-1FH-12BD-8 UT/PT SCS No significant Transition piece UT-H-409, Rev. 1 indications.

to safe-end PT-H-600, Rev. 2 extension 2821-1FH-12BD-9 UT/PT SCS No significant Safe-end UT-H-400, Rev. 6 indications.

extension to PT-H-600, Rev. 2 safe-end L

1 1401C E2-4 6/12/87 SL-2621 100775 4

GeorgiaPower d ENCLOSURE 2 (Continued) i FEEDHATER N0ZZLE AND SAFE-END NONDESTRUCTIVE EXAMINATION RESULTS

SUMMARY

l FALL 1986 MAINTENANCE / REFUELING OUTAGE Component.

Examination Procedure Examination Identification Techniaue Used Results l

2821-lFN-12BD-10 UT/PT SCS No significant

~ j Safe-end to UT-H-409, Rev. 1 indications.

transition piece PT-H-600, Rev. 2-2B21-lFH-12BD-ll UT/MT SCS No significant

. Transition piece-UT-H-400, Rev. 6 indications.

to transition piece MT-H-500, Rev. 2

-2821-lFH-12BD-12~

UT/MT SCS No significant 1

Transition piece UT-H-400, Rev. 6 indications.

']

to nozzle MT-H-500, Rev. 2 Lesand:

'SCS - Southern Company Services, Inc.

I 1401C E2-5 6/12/87 SL-2621

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