ML19329A537
| ML19329A537 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 10/13/1977 |
| From: | Neighbors D Office of Nuclear Reactor Regulation |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8001060051 | |
| Download: ML19329A537 (14) | |
Text
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' OCT 131977
' Docket No.:
50-269
..1 d
LICENSEE:
DUKE POWER COWANY.....,. _....
FACILITY:
l OCONEE NUCLEAR ST I' ION,. UNIT N0. 1.......................
StMMRY OF MEETING HELD ON SEPTDSER 20',.197L.IO.DISCU
~
GENERATOR TUBE INSPECTION AT,0CONEE. UNIT. 80.1,,....... SS.THE.57EA On September 20,1977 repres'entatives.of. Duke Power Company.{0PC).and l
Babcock & Wilcox (B&Wh met with.the.NRC staff.to djscuss the. subject topic.
1 A l ist of attendees is a ttache'd............................
4 j
Mr. Tuckman of DPC made a presentattop.which sumari;ted the.steem........
l generator problems which had.gccurred..up.to.tbe rresent. refueling.....
cutage.
These problems were. thost. caused.by flow. induced.vjbration..
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The remainder c* the presentation. centered.upon.tbe.results.pf.the......
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steam generator tube inspectipos.recently perforiped................
The results of the inspections.tre shown.in the. attached presentation,.....
In steem cenerator 1 A, five tubes.were found..to.be defective. ii.e.,_
greater than 40% wall thinning).out.of.16% of.the.totaltube. inspected.,.
t In the IB steam generator. 335.of_the. tubes.were. inspected.and.31.......
l Subes were found to be defectjye.. In.the. B&W, steac:, generator,.1%.js.....
, equivalent to 150 tubes.
Two of the steam generator 1B! tubes were. removed.for.further.ipspection,....
and, further examination reve61ed. localized. wall.thlening.of.4 type. pot....
i previously observed in this or.other.
appeared that the wall thinnipg.was.c, types of.stean. generators... It...._
i aused.by.cayi i
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tubes are being examined in dgta11_by.B&W.........tation/ erosion,.Ibpse..
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.E-Meeting Sunmary Duke Power Conpany (9/20/88)i..
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OCT 131977 We conclude that 33% of the tubes was an.adeguate number of tubes to.
- be inspected during this inspection.thereby.providing.a good. indication.
l of the condition of the steam, generator........
l Duke Power Conpany consnitted to do the following for Unit No.1; Provide the reruits of the analysis /
i 1.
of.the.two tubes which were l
removed in approximately_two nonths..
i l
2.
Provide B&W burst (plugging limit) data in.about two months.
3.
Develop a new ISI calibration standard in view.of.the latest.
problems with the steam generator. tubes...
4.
At' the next outage, provi@e.the tube wear rate.using. the new....
ISI calibration standard.,
5.
At the next outage, inspect.the outer.7-8 row.of. tubes.as downtime peru 1ts.
6.
Resubmit proposed Technical. Specification.considdi.ing the latest.
knowledge of problems with the.0conee steam. generator.s in.60 days....
s
\\
D. Neighbors Pro. ject Manager..,
Operating Reactors Branch #1 l
Division of Operating Reactors...
i Attachments:
1.
List of Attendees 2.
Presentation
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- EUT Y
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c - n. S u e +
f OCT 18 E77 MEETING
SUMMARY
DISTRIBUTION ORB #1 Duke Power Company ATTN: Mr. William O. Parker, Jr.
Vice President - Steam Production Post Office Box 2i78 422 South Church Street Charlotte, North Carolina 28242 Docket File L. Shao NRC PDR R. Baer L PDR W. Butler ORB #1 Reading B. Grimes NRR Reading Project Manager E. G. Case Attorney, OELD V. Stello 01&E (3)
K. R. Goller S, sigopard D. Eisenhut R. Fraley, ACRS (16)
A. Schwencer T. B. Abernathy D. K. Davis J. R. Buchanan G. Lear Meeting Sunmary File R. Reid NRCParticipant(s)
T. Carter J. Reece R. Stuart M. Fairtile J. Strosnider B. D. Liaw R. Landry G. Zwetzig C. Nelson 0
=
I TACHMENT 1 t
ATTENDEES AT NRC MEETING WITH DUKE POWER COMPANY AND BABC0CK & WILCOX SEPTEMBER 20, 1977 NRC l
l J. Reese A. Schwencer L. Shao R. Stuart M. Fairtile J. Strosnider B. D. Liaw t-R. Landry G. Zwetzig C. Nelson D. Neighbors B&W I
C. Russell R. Bonsall F. Burke M. Bonaca C. Banwarth C. Pryor DPC 4
W. Haller K. Canady M. Tuckman
-R. Eaker C. Hendrix a
007 1 3 1977 7
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ATTACHMENT 2 i
SEPTEMBER 20, 1977 STEAM-GENERATOR TUBE MEETING
.i 1.
SUMMARY
OF MAY 13, 1977 MEETING 2.
STEAM GENERATOR TUBE LEAKS SINCE MAY 13, 1977 3.
OCONEE 2 TESTING ~ '
4.
OCONEE 1 TESTING 5.
FUTURE. INSPECTION PLANS
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N
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CHRONOLOGICAL TUBE LEAKS TO MAY 13, 1977 4
LOCATION DAIE CtENERATOR
-JULY, 1976 3B LANE NOVEt1BER, 1976 1A LANE DECEMBER,'1976 2B LANE DECEMBER, 1976 1B 0FF-LANE dANUARY, 1977 1B LANE FEBRUARY, 1977 3B LANE FEBRUARY, 1977 1B 0FF-LANE MARCH,~1977 1B LANE-WELD LEAK
- 1B.
LANE MAY,.1977-.
- 4
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SUMMARY
8 ACTUAL LEAKS 1 WELD LEAK 5/8 LEAKS IN 1B GENERATOR 6/8 LEAKS IN OPEN TUBE LANE LANE LEAKS AT TOP (15TH) SUPPORT PLATE OR TUBES 0FF-LANE LEAKS AT 14TH SUPPORT PLATE VISUAL EXAM 0F 5/6 LANE TUBES - CRACKS NO VISUA LANE LEAKS k
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1
w 4
OCONEE TUBE REMOVALS THROUGH MAY, 1977 j
i BAIE GENERATOR IUBE COMMENT DEc,-1976 2B 77/23 LEAK-CRACK DEc, 1976 2B 77/27 E.C. INDICATION MAR, 1977 1B 77/25 LEAK-CRACK MAY, - 1977 1B 75/18 TUBE AND STABILIZER 1
4 l!::
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11
A CONCLUSIONS 1.
TUBE LEAK PROBLEM APPEARS TO BE RESTRICTED T OTHER PLANTL HAVE OPERATED PAST TIME OF
'0CONEE FAILURES EDDY-CURRENT SIGNALS APPEAR NOT TO BE INDICATION OF IMPENDING LEAKS 2.
LEAKS IN LANE TUBES CAUSED BY PROP 0GATION OF LOCA DEFECT BY HIGH-CYCLE FATIGUE FROM VIBRATION.
3.
LOCAL DEFECTS TO START CRACKS MAY HAVE DIVEP.SE C
't 4.
LEAKS-0CCUR PREDOMINANTLY IN LANE TUBES BECAUSE IS HIGHER.
GREATER POTENTIAL FOR VIBRATION EXISTS LARGE CMPLITUDES COULD RESULT FROM TEMPORARY FLO INCREASES 5.
NO EVIDENCE OF INTERGRANULAR STRESS CORROSION.
6.
NO EVIDENCE OF" PROBLEMS ASSOCIATED WITH. RECIRC STEAM GENERATORS-(WASTAGE AND DENTING).
7.
NO DIRECT EVIDENCE AVAILABLE ON CAUSE OF OFF-LA T
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e AGREEMEilTS MADE IN MAY 13, 1977 MEETING 1..
SUBMIT TECHNICAL SPECIFICATIONS ON S.G. LEAKAGE AND IODINE LIMITS COMPLETED JUNE 21 AND JULY 8, 1977 2.
KEEP NRC INFORMED OF TUBE LEAKS, INSPECTION RESULTS, AND PLANS CONTINUING 3.
SAFETY ASSESSMENT OF OTSG LEAKS SUBMITTED AueusT, 1977
- 4. -: PLANS FOR RESOLUTION OF OTSG TUBE PROBLEM SUBMITTED AueusT, 1977 7
t.
s STEAM GENERATOR LEAKS 4
SINCE MAY, 1977 DAIE STEAM GENERATOR IUBE JUNE, 1977 3B 78/1 JULY, 1977 3B 77/2 1
NO LEAKS O'N OCONEE 1 OR 2.
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A 1
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w OC0tlEE 2 INSERVICE I!!SPECTION JUNE - JULY, 1977 EEUERATOR 2A SAMPLE
' SIZE LOCATION RESuLTS l'
37.
RANDOM AND OPEN LANE NO DEFECTS GENERATOR 2B 1
3%
RANDOM AND OPEN LANE ll IUBES 2
3%
PERIPHERY AND AROUND NO DEFECTS DEFECTS DEFECTS LOCATION CORRECTIVE ACTION 75/5 ISTH STABILIZED 75/9 15TH REMOVED 112/29 12TH PLUGGED 78/2 15TH STABILIZED
~
-QCONEE 1 INSERVICE INSPECTIONS AUGl1ST'- SEPTEMBER. 1977 fj]ERATOR 1A SE1 ELE.
SIZE
. LOCATION OF SAMPLE RESULTS 1
7%
OPEN LANE AND ADJACENT 1 1/2%
3
~t TOTALLY RANDOM 3%
RAND 0M PERIPHERY 2 1/2%
2 3%
RANDOM PERIPHERY l
AND AROUND DEFECTS 3
6" RANDOM PERIPHERY WX XY l
TOTAL 16%
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.p,.,41, esp et-OCONEE l' INSERVICE INSPECTIONS
. AUGUST - SEPTEMBER, 1977 GERERaI0lL1H-ResULTS LOCATION OF SAMPLE SmeLE SlZE OPEN LANE AND ADJACENT 1 1/2%,
5 1
7%
3%
TOTALLY RANDOM 2 1/2%~
RANDOM PERIPHERY 10 2
3%
RANDOM PERIPHERY AND AROUND DEFECTS 10 PERIPHERY WX XY 3
6%
2 RANDOM PERIPHERY YZ ZW QUAD.
li 6%
ALL TUBES PERIPHERY WZ XY OUADi4-5 11%-
TOTAL-33%
.-