ML070600443

Amergen QA Review of Underwater Construction Scope (5 Pages)

ML070600443
Person / Time
Site:	Oyster Creek
Issue date:	10/28/2006
From:	Vallance C Underwater Construction Corp
To:	Mcallister M AmerGen Energy Co, Office of Nuclear Reactor Regulation
References
Download: ML070600443 (5)

Text

-e DATE: 10/28/06 TO: Martin McAllister FROM Charles Vallance TITLE: NDE, Level I11 TITLE: NDE, Level 111 COMPANY: ExelodAmerGen COMPANY: Underwater Construction Corporation ADDRESS: Oyster Creek Nuclear Generating Station ADDRESS: 110 Plains Rd US Highway Route 9 Essex, CT 06426 Forked River, NJ 0873I The following uncontrolled document(s) are being transmitted to you. Please destroy or clearly mark all previous revisions or issues. Veri@ the total number of pages received in the appropriate column. Retain a copy for your records.

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I DOCUMENT

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REV. DATE DOCUMENT TITLE SENT PAGES I PAGES RCVD.

QP10.09-OCNGSlF221; Record NO. 1 1 10/28/06 Attachment 1-Qualitative Inspection Record & Attachment 2-Quantitative Evaluation of Metal Loss Record 4 l

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I I I I I I I FAILURE TO ACKNOWLEDGE RECEIPT WITHIN THIRTY (30) WORKING DAYS MAY RESULT IN REMOVAL FROM DOCUMENT DISTRIBUTION.

PRINTED NAME TITLE I SIGNATURE: I DATE:

UNDERWATER CONSTRUCTION CORPORATION -

PROCEDURE:QPlO.09 OCNGSi R2I REVISION: 1 ATTACHMENT 1 QUALITATIVE INSPECTION RECORD

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PRESERVICE [ ] INSERVICE [XI WORK ORDER NO. R2077340 VT-1 { ] VT-3 [ XI GENERAL VISUAL [ ] RECORDNO.: 1 P a g e L o f Q DIRECT [XI REMOTE [ 1 ILLUMINATION CHECK (TIME): START= STOP & l ILLUMINATION CHECK SAT [x] UNSAT [ ]

Client: Exelon/AmerGen Facility Location: Oyster Creek Nuclear Gen. Station Project No.: 01-02260.56 Date: 10/28/06 Description of Vessel: G.E. BWR Mark I Containment-Torus Location: Bays No. 1 - 20 (Shell)

INSPECTION INFORMATION: Submerged Torus Shell (Pressure Boundary)

Principal Torus Coating: Mobil78 + Mobil46 x 16 Surfacer Classification of Coating Deficiencies:

TYPE DESCRIPTION Cracking In Top Coat None To S u b s t r a t e w Location N/A Area:-, NIA Delamination In Top Coat None To Substrate N/A Location NIA Area: N/A Blistering Per D714: No. 2 to 6 Med to Dense Location Invert & near waterline Area: 1 to 10 soft m.

Flaking or Peeling Frac blisterstlow adbesion Location Associated with Blistering Area: 1 to 2 saft ~YD.

Mech. Damage Random to med dense Location- primarily at invert Area: 1 to 2 sqft tw.

Tiger Striping N/A Location NIA . Area: NIA -

Discoloration - Surface staining Location primarily at invert Area: 1 to 10 sqft m..

Classification of Substrate Deficiencies:

Pinpoint Rusting Random Location various locations Area: <1 s q f t a Uniform Rusting Minor Location various locations Area: <1 saft typ.

Pitting Corrosion (< threshold values) 2 to 39 mils Location urimarilv at invert Area: s.OG 173qrCI Dry Film Thickness Gauge: SN 181771 SN -l+W9- SN EJ0181 SN EJ024r NIST Cal. Plates: SN K-84487 SN K-75160 Dial Depth Gauge: SN D-24 SN 177857 Calibration Flat: SN 05002 GotNo-Go Pit Gauge: SN PB-I 5 1 - Gauges disposed of on site.

\o!aS 6 Level IINDE Inspector Level 111 Inspector Date IS1 Engineer Review Date ANI1 Review Date

UNDERWATER CONSIRUCTION CORPORATION -

PROCEDURE: QP10.09 OCNGSl R21 REVISION: 1 ATTACHMENT 1 (CONTINUED)

QUALITATIVE INSPECTION RECORD PRESERVICE [ ] INSERVICE Ix] WORK ORDER NO. R2077340 VT-1 [ ] VT-3 [ X 1GENERAL VISUAL [ ] RECORDNO.: 1 P a g e L o f A DIRECT[XJ REMOTE [ I Client: ExelonlAmerGen Facility Location: Oyster CreeK Nuclear Gen. Station Project No.: 01-02260.56 torus shell is coated, however, there are numerous small coating deficiencies that expose base metal. These consist primarily of fractured blisters with minor mechanical damage and spot rusting and typically measure 1/16" to %,' in diameter. Pitting of the base metal was qualitatively assessed and typically ranged from 2 to approximately 40 mils.

Blistering of the pressure boundary coating is found in all 20 bays. The heaviest blistering is generally near the invert.

Blister size is No. 2 to No. 6. Degree of frequency is medium to medium dense as rated in accordance with ASTM D 714 "Standard Test Method of Evaluating Degree of Blistering of Paints". Fractured blisters appear to expose undercoat or substrate. Blister size in these areas randomly exceeds ASTM rating (112" to 1-114 diameter).

The balance of the coating in the inspected areas exhibits random moderate to heavy surface straining (not to substrate), mechanical damage, and pinpoint rusting.

Coated Surfaces: Coating deficiency indications consist primarily of blistering, discoloration, and minor mechanical coating damage in all 20 torus bays. Frequency and distribution of these conditions is as described above.

Photographs of typical conditions can be found in the final report. Coating deficiencies exposing base metal were identified and repaired by the application of an underwater coating.

Uncoated Surfaces: Reportable Pitting indications are recorded on the attached quantitative data sheets (attachment 2).

Photographs of typical pitting conditions can be found in the final report. Other localized areas of exposed base metal exhibit only minor corrosion and surface rusting. There are no indications of discoloration, arc strikes, gouges, dents, pitting, cracks, wear, excessive corrosion, erosion, or other signs of surface irregularities.

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-/f$&\g?.v Level I1 NDE Inspector eve1 I1 NDE spector

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Level I1 M3E Inspector 810 6 Date Date Level I1 NDE Inspector Date d e Level I1 NDE Inspector Date ate

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IS1 Engineer Review Date ANI1 Review Date

UNDERWATER CONSTRUCTION CORPORATION PROCEDURE: QP10.09 - OCNGSIR21 ATTACHMENT 2 (CONTINUED)- DATA SHEET QUANTITATIVE EVALUATION OF METAL LOSS RECORD Work Order No.: R2077340 Project No.: 01-02260.56 Record NO.:^ Page X 1 0.052 I0.006 10.011 0.041 0.250 2 8 from P3 WS in 56l from IWS NA I N/A x N/A Ad] Zero not used in metal loss calc I

tt 48l from P2/3 X 0.073 0.026 0.029 0.044 0.250 WS in 6"from IWS N/A NIA x NIA Adj Zero not used in metal loss calc 0.010 0.021 0.041 0.038 46" from 415 RG in 5 0 from IWS NIA N/A x NIA Adj Zero not used in metal loss CalC 27" from P4/5 0.006 0.014 0.076 0.025 WS in 3 6 from IWS NA I NIA x N/A Adj Zero not cdsed in metal loss calc 22" from P5/6 05-P5-02 N/A 0.000 0.016 0.039 0.025 WS in 34" from IWS N/A MA x NIA Adj Zero not used in metal loss calc 20" from P4/5 52.5" from 07-P5-01 0.000 0.020 0.050 0.025 WS in IWS NIA N/A x NIA Adj Zero not used in metal loss calc

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10.5" from P4/5 NA 10.058 0.000 0.018 0.041 0.125 WS in 67" from tws Pit 01-GI N/A x NIA Adj Zero not used in metal loss calc

--u-lL I O ! from P4/5 NA 0.062 0.000 0.018 0.044 0.125 WS in 61" from Iws Pit 02-GI N/A x N/A Adi Zero not used in metal loss calc lO)L4/LZ P ,3-%-0 6 Date Level II &DE Inspector Date Date Inspector ANI1 Review Date

ATTACHMENT 2 QUANTITATIVE EVALUATION OF METAL LOSS RECORD PRESERVICE [ 3 INSERVICE [XI WORK ORDER NO: ~2077340 VT-1 [X]VT-3 [ IGENERALVISUAL [ ] RECORDNO.: 1 Page 3 o f A DIRECT [XI REMOTE [ ] Project No.: 01-02260.56 ILLUMINATION CHECK (TIME): START NA STOP NA ILLUMINATION CHECK: SAT [ X 3 UNSAT [ ]

Client ExelodAmerGen Facility Location: Oyster Creek Nuclear Genqating Station Date: 10/28/06 Description of Vessel: G.E. BWR Four/Mark I Containment - Torus Location: Bay No. 4,5,7, & 15 Measure and Test Equipment: ]73q]y @P%Q*Ub DryFilmThicknessGauge: SN 181771 SN W W I 9 SN EJOIS1 SN EJ0241 NIST Cal. Plates: SN K-84487 SN K-75160 Dial Depth Gauge: SN D-24 SN 177857 Calibration Flat: SN 05002 GONO-GoPit Gauge: SN PB-15 1 - Gauges disposed of on site.

Procedure for Determining Metal Loss:

Metal loss values have a higher degree of accuracy when the protective coating is removed. Since it is not practical to remove the coating at all measxed sites, it is generally performed when the metal loss values (obtained with coating in place) approach or exceed the maximum value (MAV) established by the Cwner. Metal loss values (MLV) are obtained by subtracting the sum of the average dry film thickness (ADFT) value and the dial depth gauge adjusted to zero value (AZV) from the pit depth value (PDV). Thus, MLV = PDV (ADFT + AZV)

Pit ID = Bay#, Plate(P)#, Pit# I Pit Group = N/A if not present I Isolated Pit (ISO) = N/A if not present I Pit Depth = Uncorrected for surfaci Examples: roughness or DFT 16-2P-023 = Bay 16, shell plate 2, pit # 023 Adj. Zero = Surface roughness measured near pit Avg DFT = Average dry film thickness near pit I

Metal Loss = Pit Depth - (Adj, Zero + Avg. DFT) Pit Diameter = Diameter of pit or pit Coordinate = Location measured as an X / Y distance from a structural feature group across longest dimension) (such as a Ring Girder) or azimuth & distance from a penetration.

Pit Coordinate = X / Y coordinate or azimuth & distance. Adjacent Pits = Enter Pit 1D#s of adjacent pits or pit groups Video Ref. = reference UT Thickness = Wall from VCR counter thickness per Owner