ML091980131
| ML091980131 | |
| Person / Time | |
|---|---|
| Site: | Oyster Creek |
| Issue date: | 12/03/2008 |
| From: | NRC Region 1 |
| To: | |
| References | |
| FOIA/PA-2009-0070 | |
| Download: ML091980131 (5) | |
Text
Prýecisiol nfor4ation -- Offl ual U Oyster Creek License Renewal Commitments Inspection Exit Meeting - Dec 3, 2008
Introductions
" NRC Region 1
" NRC HQ
" NRC Residents
" AmerGen
" NJ DEP (Observers)
Excellent Overall Cooperation from everbod
>>> use of the Certrec Internet Database was quite) .Wfi Special Thanks
- Pete Tamburro (LR Progri ý,4 ner)
" Chris Hawkins (NDE Ley,"
" Cal Taylor &Jhansi Kand,-:,
Tough Inspection Schedule & Difficult Inspei't-
- LR outage schedule slipped due to" ex'ected issues ',',,
" Some NDE UTs re-scheduleddfue't unariticipated piysical interference issues
" Bay 11 Coating Blisters
" Bay 3 Moisture Barrier Seal Problem
" Cavity Leakage and Water Intrusion into 4"bays
" As a result, our inspection ran into a 2nd on-site week and a 3rd in-office week Documentation .., Team Report 45 days*.fter the Exit Meeting (mid Jan)
Exec Si11mtnrv of Inspe,&ion Results a,-
(L -05 t Actions t evaluate primary containment structural integrity
- -(b)(5)
-'hese: ere also , ;,
a
- Mnoitoring of Sand Bed Drain Lines SStripppble Coating toPrevent Water Intrusion
- For the selected samplesý (b)(5) X
- Sampled** 9AMP**t* erify Commitment Implementation
" No Problems or Issues Identified, with Two/Three (??) Notable Exceptions (b)(5) ' (two items)
" Perform Full Scope inspections of sand bed region every other outage
" Monitor drywell trenches for water every refueling outage, until trenches are restored
" Verified 2 commitment changes were done iaw Exelon commitment management program
" Bolting Integrity Program (commitment 12)
" Rx Vessel Axial Weld Examination Relief Request (commitment 48)
" Regarding §54.21 Abnnual Updates, you intend to submit your 2008 Amendment Update by
~i.AI.. 3 the end of the year--
T1 (b)(5) 3 I
- I.N~III 11 UI~fUWUS UNNWU W
&~rw kc ih fthFreedom of lnfomnalm A Exemntfm C FOINPA P I-dec/ lI frm lon - O/ficiayJeO Oly tj Page 1of 5
- ýe-Decislo alIformp3 M~n--OfJ
~Pý 0's~~
Inspection Details (5 (1) Commitment 27, ASME Section XI, Subsection IWE, Item (22- (b)(5)
A strippable coating will be applied to the reactor cavity liner to prevent water intrusion into the gap between the drywell shield wall and the drywell shell during periods when the reactor cavity is flooded.
- The strippable coating initially limited leakage into the cavity drain trough at < 1 gpm. On Nov 7, the leakage rate took a step change to 4 to 6 gpm. Water was subsequently identified in 4 sand bed bays.
- This was also a previous commitment made in response to Generic Letter 87-05
~N)
K (2) Commitment 27, ASME Section XI, Subsection IW.E, Item (3F Sand bed region drains will be, m onitored daily during refuein*g outages.
(b)(5) 7 k~s
- Sand bed drains were~relrfotely monitored by checking poly bottles, attached via tygon tubing to funnels hanging belowthe drain lines, he drain lines were not directly observed.
- This was also a previdous ommitmentTmade in response to Generic Letter 87-05 I
k'ý .5-(b)(5)
(b)(5)
Pr.ecisionýInformaton -- Ofcial U/*e Page 2 of 5 Pny
J*
(3) Commitment 27, ASME Section XI, Subsection IWE, Item (3) ,,
(b)(5)
Reactor cavity seal leakage trough drains and the drywell sand bed region 'r ins will be monitored for leakage. Periodically.
e Drain line was found isolated during a boroscope examination to verify no line blockage.
. ?? This was also a previous commitment made in response to Generic Letter 87-05 K
\ (b)(5)
A/
AN UESTIONS at this point Pr decisical Inform/)ion -- OffI Ua /$yP Page 3 of 5
P.e-Deci/nal Infofation -- O*layeinly
>>> Need to identify observations that won't be in report Inspection Observations ASME IWE, Containment In-service Inspection
- D/W Inside UT Examinations
- 41 separate 7x7 arrays and 7 separate 1x7 arrays evaluated (2058 separate UT readings)
- No on-going corrosion or trend was identified
- No statistically significant deviations from 2006 data values
- Overall, not enough data ts t identify a corrosion trend, with any statistical certainty 0-./
, Adequate margin for te 20ear extended period 5i,., ..
- D/External UT Examinations in th Sand Bed Region
- 111 separate UT readings ? . -.A, Overall, not enough data sets o iden fify a corrosion trenct'with any i.atistical certainty
- 2008 data compare to 2006, shows a 1-2 mil decreaSe, well within the.statistical variances
.9 Adequate margin for the 20 year extended period,
" Leakage Monitoring of cavity drain and sand bed draiint;.
" Problems as already discussed
- Good poly bottle monitoring practices and logI4pping
- Good pro-active monitoring actions during cavity**lood-7p,(6ntinuous Ops monitoring)
" Good compensatory actions, when strippable coating: de4lminated
- You are re-thinking action levels, base1 on cavity drain leakage rates
- Calc and Action plan estabished 12 gpm Adminý Imit *c, water intrusion at observed, leakage Vdl ues . >,
- Didn't expect
" Cavity Strippable Coating
- Problems as already discussed
" Moisture Barrier Seal insidie IW (floor curb to shell)
- Done as part ofStructural Monitoring Program. No issues or problems identified-
- Newly installed in 2006. Turned out to bee:n interference item to D/W UTs.
" Commitmentforpost-PEO iasper ASME Seec-X IWE. We asked whether your Structural Monitoring exan*ii:]ion satisfi IWE. requirements. You initiated an engineering action item to evaluate this quest:n*..
" Moisture aer Sa[ inside.$'nd Bed Bays
.. 'Nmerous'd"ficiencies'i-ntified in 7 of 10 bays (none in 2006). All problems were repaired.
f:,Moisture barrie&r=:ction 'itimpaired, no cracks or separation fully penetrated the seal / .' ,
" Surface cra*ks ..
" Separation frm shell or floor
- Inadequate epoxy cure -- initial installation issue, from 1992 Protective Coatin" MonrQying and Maintenance Program
" DM/ Interior Service'tL !ICoating
- Some minor issues identified. Documented results indicated a good quality inspection
- D/V Exterior Service Level II Coating, in Sand Bed Bays
- Bay 11, one small 1/4 inch broken blister identified, with a 6" rust stain
" During initial investigation, 3 smaller unbroken blisters also found
" All 4 blisters were within a 1-2 inches square area, and all were thoroughly evaluated and fixed.
" Good extent of condition, 4 bays re-inSpected by a different level-Il
- During follow-up, you identified a 2006 video that showed the same 6" rust stain e Estimated corrosion of - 3 mils, over a 16 year period
" No impact to D/W structural integrity, when compared to existing thickness margins Pre. ecis(inal Info?#tion -- Off0ial U/e ly Page 4 of 5
"e- ecisr al Infor i/on -- 01ia lOi</
Electrical Cables and Connections
- Drywell Cable Inspections
- Good attention to detail & good questioning attitude
- Good engineering planning, prep, and participation 9 Excellent cooperation between work group and engineering Inaccessible Medium Voltage Cables
- Cable Testing - Auxiliary Transformer (bank 4)
- Cable test done as part of transformer Doble Test
" Some industry experience suggests that large transformer charicedstics can de-sensitize the test results regarding cable insulation degradation Buried Piping
- ESW Pipe Replacement and Tie-in
- FME control and pipe handling (to protect pipe coting adequate to ensure a quality installation Structures Monitoring Program
- Intake tunnel and expansion joints
- Good hand-offs between night-shift and day-shiflengin'rQL.Z ,,,
One-Time Inspection Program
- Isolation Condenser Inspection and UT below the water line
" Observed coatings inspection and UiT daattaiking
" Reviewed UT data evaluation Periodic Inspection Program -4w
" Condensate System expansion joint inspection
" Fire barrier inspection inside a switchgear Metal Fatigue Program._
- At this point in time, not enough program usage tQ have resulted in a change to the high cumulative usage factor cmponents List.
ANY QUESTIONS for US Pjdeci onal Inform ion- Off(ial U e Oly Page 5 of 5