ML13109A453
| ML13109A453 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 04/15/2013 |
| From: | Batson S Duke Energy Corp, Duke Energy Carolinas |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| Download: ML13109A453 (6) | |
Text
~DUKE ENERGY.
Scott L. Batson Vice President Oconee Nuclear Station Duke Energy ONOIVP 1 7800 Rochester Hwy.
Seneca, SC 29672 o: 864.873.3274 f: 864.873.4208 Scott.Batson@duke-energy.com April 15, 2013 U. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555-0001
Subject:
Duke Energy Carolinas, LLC (Duke Energy)
Oconee Nuclear Station, Unit 3 Docket No. 50-287 Unit 3 End of Cycle (EOC) 26 Refueling Outage Request for Additional Information (RAI) Response to 3EOC26 Steam Generator Inspection On August 27, 2012, Duke Energy submitted information summarizing the results of the 2012 Steam Generator (SG) tube inservice inspections performed during the Oconee Nuclear Station (ONS) Unit 3 EOC26 Refueling Outage (ML12242A553). In addition to this report, the Nuclear Regulatory Commission (NRC) staff summarized an April 30, 2012, conference call about the 2012 SG tube inspections at ONS Unit 3 in a letter dated June 28, 2012 (ML12178A206).
On December 6, 2012, the NRC Staff electronically sent a draft request for additional information regarding this SG report. The enclosure provided in this submittal contains Duke Energy's response to the RAI.
This submittal document contains no regulatory commitments.
If you have any questions or require additional information, please contact Corey Gray at (864) 873-6325 Sincerely, Scott L Batson, Site Vice President Enclosure 4Ao4-7 www.duke-energy.com
U. S. Nuclear Regulatory Commission April 15, 2013 Page 2 xc (w/enclosure):
Victor McCree Region II Administrator U. S. Nuclear Regulatory Commission Marquis One Tower 245 Peachtree Center Ave., NE, Suite 1200 Atlanta, GA 30303-1257 John Boska Project Manager (by electronic mail only)
U. S. Nuclear Regulatory Commission U. S. White Flint North, M/S O-8G9A 11555 Rockville Pike Rockville, MD 20852-2746 cc (w/o enclosure):
Ed Crowe NRC Senior Resident Inspector Oconee Nuclear Station Susan Jenkins Section Manager Division of Waste Management Bureau of Land and Waste Management SC Dept. of Health & Environmental Control 2600 Bull St.
Columbia, SC 29201
Duke Response to RAI's dated December 6, 2012 By letter dated 8/27/12, ML12242A553, Duke submitted the Oconee U3 SG tube inspection report. In addition to this report, the NRC staff summarized a conference call about the 2012 steam generator tube inspections at Oconee Unit 3 in a letter dated June 28, 2012 (ADAMS Accession No. ML12178A206). The NRC staff has the following draft RAls:
- 1. Paragraph "g" in the inspection report states that tube-to-tube wear was observed between the 7t" and 8th tube support plates (TSPs) and that the worst case observed wear was 8.6 inches in length.
- a. Please confirm the worst case observed length for tube-to-tube wear, as the Service Induced Degradation Table appears to show an indication of 9.17 inches in the tube in row 91 column 51 of SG 3A.
Duke Response The worst case observed tube-to-tube wear indication was 8.6 inches in length. The indication reported as 9.17 inches long in row 91 column 51 of SG 3A was with a bobbin probe. This indication was further characterized with an array probe and it was determined that two indications were actually present. One indication measured 8.05 inches in length and the other measured 5.93 inches in length. A bounding length of 20 inches was conservatively used for structural integrity analysis.
- b. Please discuss any tube-to-tube wear found outside the region between the 7Ph and 8eh TSPs, as the Service Induced Degradation Table appears to show tube-to-tube wear between the 9th and 10'h TSPs (e.g., in the tube in row 128 column 90 of SG 3A).
Duke Response There were no confirmed tube-to-tube wear indications reported outside the 7th and 8th TSP. The indication in tube R128-T90 in SG 3A was reported as no degradation found by the array probe.
- c. Please provide tubesheet maps showing the locations of tube-to-tube wear for both Oconee Unit 3 SGs.
Duke Response See attached.
- d. Please discuss any insights regarding the root cause of the tube-to-tube wear.
Duke Response The cause of the tube-to-tube wear is believed to be lateral deflection of the tubes during heat-up when the shell is cooler than the tubes. The tubes with the highest compressive forces are most subject to this effect.
Page 1
11
- 2. Please provide definitions for the following terms that were used in the Service Induced Degradation Tables of the report: MLT, FLT, CTR.
Duke Response MLT= Multiple Wear Indications FLT= Flat Wear Identified CTR = Center Span Indication
- 3. During the outage conference call, it was noted that two foreign objects had been found in SG 3A, one on the 1 1h TSP and one on the lower tubesheet. Please confirm the foreign objects were either removed or that an engineering evaluation was performed and the evaluation results indicated it was acceptable to leave the foreign objects in the steam generator until the next inspection.
Duke Response The foreign object at the lower tubesheet was removed from the steam generator. The foreign object at the 11 h tube support plate was evaluated and found acceptable to leave in service.
Page 2
S W 97:OýC ý 14 JSLAj UOL X 170L690O :A1V3S
@a go@
oeeC eeWAONOmoo00 Of!Il BID ll I!: 11 6 100 0
o6000 emo o~
o.
'800 0oossoeom~
00cl00000000 a
oile 0000 o009 09 00000w 000009 000009 OL 09 000000~
o~0o~
~000009 000000~
9090009 C00000~
0000009 O000§0~
O00000~
9000009 9000009
§00000 9000009
§00000 000009 900000~
000009 900000~
000009 8 p~o0~
000000g eee.00000000000e0Q e§ S IXVG Mgoooooeooooeeeo eeoo.'0C)oooocooooooo 008000e0000060e ee0ee~00000§0o00e 0000000 400 00000
~~eee0 00eeo oeeee o
e c
o oo o
o x06 000000000000 ooeoo 00000 0
00000000000 000 0
0 ooooao~ooooo~oOO~eeo~oo 00000 co 000 0
000 0000 oeo........................eeeOO eoO.....
ee cc o~o o
o o
o 0C Goeso cc eeeeo000.
-0 OCC 00 ooooeooeeoooeeeooeooeo 00 000600000060000
- 1. 1 1
1 111. 1 1 1eoooooeo00 GO 000 0
000000000000(000
~
2g~
000 Z~
66 8
143 0
0600
) DO 0000000000 ooooeooooooooooooooo00000000686 a
00000
@606684ooooooooo006884'oeo9680, a,
I'Meeso 0oooooooo0oo 000000000000000080800800 00000008000880000 000000000000000000000000009 00o00o000.1O es o00
@aeWe,000686866600.)0
)00q0c 0000000000000000000 ease000000300 a003 0000000000000000000000000000000000000000000000 0
00000000000800000096660000000000000000000 000000000000000 a00000000 0000000000000 0000
@access8080@cases0000 080000000@00 066000000000000
'000000000000000000000080000000000 0
00000000880"Oe"I'l 0000000000000000000000000 040000000 Goo03 Goo8030080 see 000003000000000000000 0000090000830G0ese sea sea00000 0 000006000 00000 00 0000
'E00 0 0 0
00 0
0 0 00 0 0 8 8 0 0 8 8 8 8000 8
0 0 0 0 0 0 0 00000000000000000 M
N0000000 00 0 00 0 00 0
00000000000000000000000800880800080000000 008008000000000000000000000000000000000000000
')(R?0000000000000000000080000000 0UO 00000000000000 0000000000000000 0000000000
)00000000000000 00000000000000 680060000000 0000000008r00000000000000 0000000000000600000800 100 s0o00008000080000 Ocoee@00000000000000000
,000000000000000000000088000 080000800000000800000008 0000000000000000000000000000000 moo0 a()
000000000000080000800000 00808 00000000@8000000000000000 a00000000000000080000800900 00000 800000000000000000000000.0 00 000000 C)000000000000000
-000 000 000 000080000000 000000000000000000000000 00 0000000 000000000000000000000000 00000000000(
0000000000008000 80000800000 00080 0000 00ý0000000080 e60601028000600000 1:00 00800000 000000000000080000000000808080000000 000008 0 0000 000080000008000000000000
- 000000000000000800008000 0
00 00 000000 0
000000000000000000000000 000000000 00 000000008000000088008800000000 008000000 00088000080000000000000
()GOO@
0000000000080000800000 0000000800000000000000000000000000000000 0000 "00 1 310e"t UUiNea a~0.0008600000000 0000000000000000a@00000000000 0000 o0 00000000
.000WN0000000 1000080 00000008000000 808000 00800000000080000000000000 0000000000830806000000080000000000 0
090900000 000000 20O000000300000' 000000000000008000088008 0000000090088000880080000080000000000 0800000000000600006000060000 001 000-003000 000000 00000@0@
DID 0 0Ii:
3l III I l0 8@600 ll0A0000001;:0F0AD?000200000
~
00oce"00 0C 10000(
00000000000000000800.
0000008000800000006 906000 000000060000000000000000 00 0
00 0
04INll0 00E'D 0000000800000000000000000000 000000000000 0000 00 0000 00000000000000000000 80008080800000000000000080080008008080000000000000800000000000060000@000000000 000000049@
800000000000000@0088800080000008886000880000000000000000000SO0000000000 cocoa 00000000000000000000000000000000000800000000 0000000000ED0004D00ce o@06 000000000 0I01 300000000 000009680090e0000000000000a0ee 08800080p380000000000 01IOO000 00008800000000 00800 i
WC0080000800800000000000000000000 000008000000000080080880000800000000000000008000000 0000 00 go co0000000 808000000000000000008000000000000000000800800000000000000000 0
6 00000 00000000000808080080008808000800800080000 0
60000000060 0 0 0
)...G 0000000000000008800000800080000000000000000000000000000 00 0
c)0000 00000000 0 80800000000000000000000@0000is000000000000 00z00008a00800800000000688 00000000000000000000,a 41sesess c0000066 00000000O 00008000000000008000000008000000000660000000000"o" 0.@
a 00100 M06~32 00066 00000 000080300000000000000000 00 000
~
00000 a00 goo000000800006600000600000000000000000000000 00000080000800000
@0000000000000 000000000 0000000000000 000000 s0000000000000 0000000000000 IA 60604000000000000000 800000000000000008"so0000000000 004DO0 0 Gogesego 0000000 00000000Q
,0000000(
S M
0 V
000ED00-0100.1) 900000000
,000000000 90000000
~000000000 Q0000000
~000000000 00000000
~000-00000 00000000(
~00000000 000.00001 00000000 900000000 00000000 3
(DO 0*0
~00000 0000 0000 000 00 0@0000 000000 0000000
- 0000000 09 OL 0O 0(
6 O0 000000 00*009
- 00000, N00 0000O 0600C p00 E 0009
- DL000, 00C 00, 00~
OtL
~00000000 30000000 0
,000000c 3000000 p000000 000000
.00000 00000 0000
.000 00 M
30 x
v z
89 jeaM aqni ol eqnj.@
S39fl1 dinoiiO VN
- (#) 301A83S io iflo 99
- a1310331s S39fl1 Lý991.
- S39nhlvi61 106 ~~AIIIPO9i 90d 903 ida~ CSNO 000000008000...........
00000000000 00000000000000000M0000 e00 mo0o00 SIXVA 6mp'cqo9co9# ejeldwe-L ie6oNj
£LOz mO:at Ii, jBeAuoIA X tIOL69OO :1VO 0666Ce oeeMoeoe 0o0o gas 0000 MoOOOOO oeee'Do eeoeeeea e
NOW~qe Mooseeeooeogoeeeeeocoo
-6 00 0
0
0
.. 0.0-00 00%
SIXV M S
V ovceoe~tron0 0e 0Soso e
~
e ee e
e o~e o
o o
(rmu nG 00OMMN0 S
M 0
09 OL 09~
06 0*
0v 0 a@
0 H
oecooc x
0 0a X0 0
goco g
00 0oooo o000 0 0000ee egeece cow
@G@800@
0 soeee ececeeceec eeloeeooeee M&MADMOM0 e
0eo o
oo ~
000000414101310049999909999999999909099i9 09s9e 090 Goo99
'99
- 0e0, oso 99900009 000000 0000 9000 000 0 s @o800 000 00000999099999999999999999 9 N 909900999999990009 09e009c99999999999999e009000000 Z eEoeeoeeeee10eeeeeeeeeeeeccc 9999999999999e99999c00@0 9900990000006
@0......
joa9009) ooeeeeeeoeeeeeeeococo 99999999e9e9ec999999999c09000o900000 90900990000666999~eI99999so9999 090 4999999c9999999eeec9909099~90900000000
(
so(0 G OGG Goo 0 SONOOOOM03"M 01JUN0204 MON08 0"0' 0000 90 c99999999999e9990999999999990 09009000 09090990000090999C99999999999999 900099999999999999099999999c9999c909000090
- a.
1111 1110,100011 11 0999999999 00GOeeeeeeeoO00eeceeeecoceececccecccoooooo 9099909009000900000999990999999999999999999990c9080069 9999999099000e999999009990999coo Goo000900 9099909 00-------------
--- "d-4 ----------
9999999 00 99 0
99999999999909999999999990909990a MOM G (90)
-0000000 AGOG 800099e9999996999999999999999..90 ses 0a 999 999900 e09e0990e999c9c9999co90o0 00066C9900900000000000000000 9999999999999c9 00000999999999-9-9go99I91 99909,919991991991999I:9I9199)00 I
OC 9AM00 009000000000999999 so99999990 9999990900 00 e
999999
)'999999e9899999909 9090900c6008 (Do@(
.DO "
2)OPM 0
C0z9c0eze 62go6 c
z 03e)2 000000 800 0@0 9
0 0
9 9
e 0
09 0
0 9
e 00 0eG9900..z09 ZZ8066666609 Z2000000000060 0000114999m999999999999999 99990999099999999099099999 09999990909909900000000 GOO OG GO 0
0994?99M909990069990000000000000@0099999999909999999099sagas 00099999as@05000000004 000(
999999999909990009099999a 9999999999999099999 0990 Sao coo 00 0
00 9999999999909999999999999999999e9999999999999999999so0000 999999999999999999999999999999990999999999999999990so0006 ag 66 96036636639 992666 22266669 6666360966606 696 66 6966660490so0,O g
99999969999999999999999999999099999999999099999so0900 4
S O9OOOGOGG9 0 0609999M6699999900666000 0099999999999999999990 000000000 0 voe 0
0 0
J 060 600
)000 0000 60O00 0000(
60000 00006 60000 6'00 00000
.0.00 00 006 60000
@0000 Aooe 600 0 00006 60000 00006 6000 0me0 60000 00006 00006 6000 00~
0 0
006 00 66 00 66 00 00 00 00 0g 60 60 60 60 60 09 OL 09 06 0
O0 OMi zc jeajM eqnj 01 eqn.L@
S39fl dflouo VN U)31N io-n ze
- 0310313S S39fl1 Lc9qL
- S39flhlviol 9 0/S ide~ CSNO
~6 990999
~9~~b~999999999999O9999999999999999999990999909090900090900000 0~
06636666666693660 0
6666 66C~2~
~0"~
0v0 99999999999999999999999999099990999099999999999099999999000900000000 999999999999999999999909999999999999999990t69900909909000990000000 963999909999999909999999999999999999999999099909999099900000000 99999999999999999999099999909999999999999909966090006990000 99999999999999099099999999999999999996699990999600900000 999999909900999999990999999900090009900099900000000 99e9909999999c999999999990999090990099660090000 099999999999990999099999099000990660000000 9999999009090099009000~ 0 0~~669 696 V
z SIXV A 6mp~cqo9co9# ejeldwa+/- i e~oNj