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NRC Bulletin 2002-02, Reactor Pressure Vessel Head & Vessel Head Penetration Nozzle Inspection Programs, Request for Additional Information
ML030020565
Person / Time
Site: North Anna  Dominion icon.png
Issue date: 12/20/2002
From: Hartz L
Virginia Electric & Power Co (VEPCO)
To:
Document Control Desk, Office of Nuclear Reactor Regulation
References
02-491B, BL-02-002
Download: ML030020565 (68)
v • d • e


Text

VIRGINIA ELECTRIC AND POWER COMPANY RICHMOND, VIRGINIA 23261 December 20, 2002 U.S. Nuclear Regulatory Commission Serial No.02-491 B Attention: Document Control Desk NL&OS/GDM RO Washington, D.C. 20555 Docket Nos.

50-338/339 License Nos.

NPF-4/7 Gentlemen:

VIRGINIA ELECTRIC AND POWER COMPANY NORTH ANNA POWER STATION UNITS I AND 2 NRC BULLETIN 2002 REACTOR PRESSURE VESSEL HEAD AND VESSEL HEAD PENETRATION NOZZLE INSPECTION PROGRAMS REQUEST FOR ADDITIONAL INFORMATION In a letter dated September 12, 2002 (Serial No.02-491), Virginia Electric and Power Company (Dominion) responded to NRC Bulletin 2002-02, "Reactor Pressure Vessel Head and Vessel Head Penetration Nozzle Inspection Programs," for North Anna and Surry Power Stations.

Item 2 of the bulletin requires licensees to provide a supplemental response, within 30 days after plant startup, following the next inspection of the reactor vessel head (RVH) and reactor vessel head penetration (RVHP) nozzles to identify the presence of any degradation. This information was provided for North Anna Unit 2 in a letter dated October 18, 2002 (Serial No. 02-491A). This letter also included Dominion's response to an NRC request for additional information associated with the integrity of the North Anna Unit 1 reactor coolant pressure boundary and its conformance with regulatory requirements.

During their review of the information provided in Dominion's October 18, 2002 letter, the NRC determined that additional information was required regarding the RVHP inspections previously performed for North Anna Units 1 and 2.

As a result, a conference call was held on November 18, 2002, to discuss the NRC's questions. At the conclusion of the conference call, Dominion stated that it would provide a docketed response to the NRC questions discussed during the call. The NRC questions and our responses are provided in the attachment.

If you have any further questions or require additional information, please contact us.

Very truly yours, Leslie N. Hartz Vice President - Nuclear Engineering oq

Enclosure Commitments made in this letter:

None cc:

U.S. Nuclear Regulatory Commission Region II Sam Nunn Atlanta Federal Center 61 Forsyth Street, SW Suite 23 T85 Atlanta, Georgia 30303-8931 Mr. M. J. Morgan NRC Senior Resident Inspector North Anna Power Station Mr. J. E. Reasor, Jr.

Old Dominion Electric Cooperative lnnsbrook Corporate Center Suite 300 4201 Dominion Blvd.

Glen Allen, Virginia 23060

SN: 02-491 B Docket Nos.: 50-338/339

Subject:

RAI - NRC Bulletin 2002-02 COMMONWEALTH OF VIRGINIA

)

)

COUNTY OF HENRICO

)

The foregoing document was acknowledged before me, in and for the County and Commonwealth aforesaid, today by Leslie N. Hartz, who is Vice President - Nuclear Engineering, of Virginia Electric and Power Company. She has affirmed before me that she is duly authorized to execute and file the foregoing document in behalf of that Company, and that the statements in the document are true to the best of her knowledge and belief.

Acknowledged before me this 01 da of e

2002.

My Commission Expires: 331 (2r Notary Public (SEAL)

Enclosure Response to Request for Additional Information NRC Bulletin 2002-02 North Anna Power Station Units I and 2 Virginia Electric and Power Company (Dominion)

Response to Request for Additional Information NRC Bulletin 2002-02 North Anna Power Station Units 1 and 2

1. How many penetrations (RVHPs) were ultrasonically inspected on the North Anna Unit I reactor vessel head during the previous outage?

Six penetrations (3, 11, 31, 33, 52 and 60) were ultrasonically examined from the inner diameter (ID) surface of the penetrations to the extent required to size eddy current indications that were detected on the inside diameter of the penetrations with the gap scanner. In addition, penetration 50 was ultrasonically examined from the ID surface of the penetration to look for potential circumferential indications above the J-groove weld on the outer diameter (OD) of the penetration at the root of the weld.

2. Please identify which RVHPs were identified as masked during the recent visual inspection perforned on the North Anna Unit 2 reactor vessel head and also characterize the extent of the masking for each penetration? What steps were taken to clear debris, boric acid, etc. from the masked RVHPs?

A list of the masked penetrations and the extent of the masking (i.e., by quadrant) is provided in the attached Table 1, "Masked Penetrations, North Anna Power Station Unit 2."

The engineering inspection procedure used to perform the RVH and RVHP inspections states that..."IF masking is evident, THEN pressurized air (maximum 60 psig) directed through an air hose may be utilized to remove loose debris that interferes with the performance of a qualified visual examination."

A remotely operated camera mounted on a moveable cart was used to perform the majority of the RVH and RVHP inspections. The camera cart had an air hose attached that was used to remove loose or lightly fixed boric acid and/or debris to facilitate the inspections.

Consistent with the inspection procedure, an air pressure of approximately 60 psi was used. A small number of boroscope inspections were also performed in areas that the cart could not easily access (e.g., the areas of the RVH and RVHPs located near the periphery of the RVH). The air hose had to be used separately in these areas, which proved difficult to accomplish effectively.

The decision to use air pressure to remove boric acid and/or debris was based on the examiner's judgement.

When it was obvious that the air pressure would be of no benefit (e.g., large, hardened boric acid flows from the conoseal surrounding an affected penetration), air pressure was not used.

Less boric acid accumulation was observed on the Unit 2 RVH during the Fall 2002 outage than was previously observed on the Unit I RVH during the Unit I Fall 2001

inspection. This is likely due to the Unit 1 conoseal leak potentially depositing boric acid on the Unit 1 RVH for a longer period (i.e. up to a full cycle); whereas, the Unit 2 RVH had been cleaned during the previous mid cycle inspection.

3. Please provide the length and location of the RVHP tube inner diameter axial indications. (The axial locations of the indications should be provided relative to the J-Groove weld.)

Ultrasonic testing (UT) data and Eddy Current testing (ET) data are provided in Attachments 1 and 2, respectively, for the axial indications identified in the North Anna Unit 2 RVHPs.

It is not possible to extract precise UT dimensional data relative to the root of the J-Groove weld without reanalyzing the raw UT data. This is because the dimension to the J-Groove root is a nominal dimension, and the data points that were recorded are in relation to the start of the scan, not the J-Groove weld. However,-sketches are included in Attachment 1 that were made using the raw UT data at the time of the examinations that show the locations of the indications relative to the measured distance to the J-Groove weld. Dimensional data relative to the root of the J-Groove weld was also not recorded for the ID ET examinations; however, graphics are included in Attachment 2 that show the locations of the recorded indications. In many cases, the outline of the J-Groove weld is visible in the ET data.

4. Please provide the axial location of each outer diameter circumferential indication identified relative to the root of the J-Groove weld, as well as the length of the indication.

See the attached Table 2, "Location of OD Flaws Detected by UT in NAPS Unit 2 CRDM Penetrations." The axial location provided in the table represents the closest approach of the indication to the root of the J-Groove weld. Tables 3 and 4 provide additional information for RVHPs #54 and 65, which include the two indications that most closely approach the J-Groove weld root. These two indications are at 119 to 198 degrees on penetration #54, and at 160 to 190 degrees on penetration #65.

These indications were plotted at 5-degree increments along the length of the indication to better characterize the flaw location relative to the J-Groove weld root.

Table I Masked Penetrations North Anna Power Station Unit 2 U-0 S

2 Quadrant C masked by debris (paint chips) 7 Quadrants C and D masked by debris (paint chips) 24 Quadrants A, B, C and D masked. A and B had boric acid potentially from conoseal leak, Quadrant D had debris 27 Quadrants A, B, C and D masked by paint chips and boric acid potentially from conoseal leak 32 Quadrant C masked by debris (paint chips and loose boric acid) 33 Quadrants A, B, C and D masked, A, B and C had boric acid potentially from conoseal leak 41 Quadrants A, B, C and D masked by boric acid potentially from conoseal leak 42 Quadrants B and C masked by boric acid potentially from conoseal leak 46 Quadrant C masked by debris 47 Quadrants A, B, C and D masked by boric acid potentially from conoseal leak 50 Quadrant C masked by paint chips and loose boric acid 52 Quadrants C and D masked by boric acid potentially from conoseal leak 53 Quadrants A, B, C and D masked by boric acid potentially from conoseal leak 59 Quadrant C masked by boric acid potentially from conoseal leak 60 Quadrants A, B, C and D masked by boric acid potentially from conoseal leak

62 Quadrant A masked from previous leakage (repaired but not cleaned last outage) 63 Quadrant A, B, C and D masked from previous leakage (repaired but not cleaned last outage) 64 Quadrants C and D masked by boric acid potentially from conoseal leak 65 Quadrants A, B, C and D masked by boric acid potentially from conoseal leak 66 Quadrant C masked by boric acid potentially from conoseal leak Head Vent Quadrant C masked with boric acid potentially from conoseal leak

  • - Each penetration is divided into four 90-degree quadrants.

The quadrants were designated as indicated in the diagram below with the 0-degree point corresponding to the centerline of the reactor vessel head #1 stud location:

RVHP Inspection Quadrants

Table 2 Location of OD Flaws Detected by UT in NAPS Unit 2 CRDM Penetrations 0

0T

  1. 15 OD

-1.12" 7.5 deg. to 12 0.226" Circumferential deg.

  1. 21 Potential Leak NA 220 deg.

N/A Path

  1. 35 OD Axial

-1.12" 0.80" 0.223"

  1. 41 OD

-0.52" 357 deg. to 43 0.097" Circumferential deg.

  1. 51 Potential Leak NA 210 deg. to 260 N/A Path deg.
  1. 54 OD

-.040 119 deg. to 198 0.226" Circumferential deg.

It OD

-0.276 344 deg. to 16 0.156" Circumferential deg.

  1. 59 OD

-0.312" 347 deg. to 63 0.149" Circumferential deg.

Ai OD

-0.320 156 deg. to 206 0.149" Circumferential deg.

  1. 63 Potential Leak NA 320 deg. to 0 N/A Path deg.
  1. 65 OD

-0.320 330 deg. to 42 0.152" Circumferential deg.

OD

-0.200 160 deg. to190 0.078" Circumferential deg.

  1. 67 OD

-0.800 343 deg. to 27 0.094" Circumferential deg.

  • negative dimension indicates axial distance below root at closest approach

Table 3 Indication in Penetration # 54 at 119 to 198 Dearees Plotted at 5 Dearee Increments Alongq the Lenqth 11119 6.80 I

6.96 124 6.88 7.16 129 7.04 7.24 134 6.92 7.28 139 7.32 7.36 149 6.88 7.48 154 7.16 7.52 159 7.28 7.56 164 7.40 7.56 169 7.28 7.56 174 7.40 7.60 179 7.56 7.64 184 7.40 7.60 189 7.44 7.56 194 7.36 7.52 197 7.24 7.48

Table 4 Indication in Penetration # 65 at 160 to 190 Decrees Plotted at 5 Degree Increments Alongq the Length I-.

g A

g egg cm S

160 8.28 8.48 165 8.24 8.52 170 8.16 8.56 175 8.16 8.60 180 8.32 8.60 185 8.36 8.56 190 8.24 8.52

Attachment I CRDM Open Penetration Ultrasonic Examination All Recorded Data North Anna Unit 2 Virginia Electric and Power Company (Dominion)

NAPS U2 RV Head Examination Summary of UT Results Reported Penetration Ind #

Location /

Circ Extent Axial Extent Depth Above/Below Evaluated as Orientation Degrees Inches Inches J-Groove Root Flaw 10 1

OD/NA 7 - 37 3.44 - 3.92 NA BELOW NO/WWI 10 2

OD/NA 5 4.36 - 4.84 NA BELOW NO/LOF 12 1

ID/AXIAL 138-138 2.62 - 3.58 TSM BELOW YES 12 2

ID/AXIAL 348 - 348 5.18 - 5.78 TSM ABOVE YES 15 1

OD/NA 7.5-12 2.20-2.24 0.226 BELOW YES 19 1

OD/AXIAL 355 - 355 2.76 - 3.72 NA BELOW NO/IPA 19 2

ID/AXIAL 303 - 303 5.56 - 5.92 TSM ABOVE YES 21 PLP 31 2

OD/NA 302 - 304 6.56 -6.84 NA ABOVE NO/IPA 35 1

OD/AXIAL 48 - 58 2.72 - 3.52 0.218 BELOW YES 35 2

OD/NA 172-176 4.08 -4.72 NA BELOW NO/WWI 35 3

ID/AXIAL 148 -194 3.70 - 5.20 TSM BELOW YES 35 4

OD/AXIAL 44 - 60 2.76 - 3.48 0.223 BELOW SAME IND.

AS 1 38 1

OD/NA 188 - 222 4.82 - 5.46 NA BELOW NO/WWI 40 1

OD/NA 149-161 6.68 - 6.72 NA BELOW NO/WWI 41 1

ID/AXIAL 172 - 172 3.50 - 3.66 TSM BELOW YES 41 2

ID/AXIAL 306 - 306 5.54 - 5.86 TSM ABOVE YES 41 3

OD/CIRC 357 -43 3.82 - 4.02 0.097" BELOW YES 41 4

OD/NA 342 - 351 3.86 - 4.22 NA BELOW NO/LOF 44 1

NA 69 -161 0 -2.14 NA BELOW NO/LOC 44 2

OD/NA 119 -125 6.38 - 6.22 NA BELOW NO/IPA 44 3

ODINA 139 - 220 5.58 - 5.58 NA BELOW NO/WWI 44 4

OD/NA 177 - 189 6.90- 7.18 NA BELOW NO/LOF 44 5

OD/NA 347-17 4.30-4.82 NA BELOW NO/LOF 46 1

OD/NA 4 -22 2.56 - 3.24 NA BELOW NO/WWI 47 1

OD/NA 10 -24 3.48 - 3.48 NA BELOW NO/WWI 47 2

OD/NA 154 - 235 5.72 - 6.24 NA BELOW NO/WWI 47 3

OD/NA 201 - 220 7.64 - 7.52 NA BELOW NO/WWI 47 4

OD/NA Several spots Several Spots NA BELOW NO/LOF 48 1

OD/NA 208 - 272 0.00 - 1.38 NA BELOW NO/LOC 48 2

OD/NA 355 - 22 3.18 - 3.30 NA BELOW NO/WWI 48 3

OD/NA 67 - 82 5.18 - 5.22 NA BELOW NO/WWI 48 4

OD/NA 205 - 208 9.50 - 9.58 NA ABOVE NO/IPA 48 5

OD/NA 303 - 316 5.54 - 8.74 NA ABOVE NO/IPA 48 6

OD/NA Several spots Several Spots NA BELOW NO/LOF 50 1

OD/NA 319 - 324 10.12-10.48 NA ABOVE NO/IPA 50 2

OD/NA 301 - 305 8.50 - 8.92 NA ABOVE NO/IPA 50 3

OD/NA 20 - 27 2.40 - 2.72 NA BELOW NO/IPA 50 4

NA

@299 4.48 - 5.60 NA NA NO/NOISE 50 5

NA

@ 279 3.02 - 4.20 NA NA NO/NOISE 50 6

ID/AXIAL 169 - 169 4.76 - 5.12 TSM BELOW YES 51 1

ID/AXIAL 153 - 174 3.07 - 4.43 TSM BELOW YES 51 2

ID/AXIAL 337 - 337 3.59 - 3.95 TSM ABOVE YES 51 3

ID/AXIAL 13.5-13.5 4.63 - 5.19 TSM ABOVE YES 51 4

OD/NA 237 - 243 5.51-5.51 NA BELOW NO/WWI 51 NA I

PLP

Penetration Ind #

Location /

Circ Extent Axial Extent Depth Above/Below Evaluated as Orientation Degrees Inches Inches J-Groove Root Flaw 52 1

OD/NA 144 - 154 7.48 - 7.44 NA BELOW NO/IPA 52 2

ID/AXIAL 144 - 144 3.76 - 3.92 TSM BELOW YES 52 3

ID/AXIAL 182 - 182 4.72 - 4.92 TSM BELOW YES 52 4

ID/AXIAL 322 - 322 2.08 - 2.60 TSM BELOW YES 53 1

ID/AXIAL 151.5-151.5 5.48-5.80 TSM BELOW YES 53 2

ID/AXILA 147 - 147 4.72 - 4.92 TSM BELOW YES 53 3

ID/AXIAL 207 - 207 4.72 - 4.92 TSM BELOW YES 53 4

OD/NA 4.48 - 4.60 19.5 -21.0 NA BELOW NO/LOF 54 1

OD/CIRC 119 - 198 6.68 - 7.40 0.226 BELOW YES 54 2

OD/CIRC 344-16 3.28-4.04 0.156 BELOW YES 55 1

ID/AXIAL 208.5 - 208.5 4.20 - 4.56 TSM BELOW YES 55 2

ID/AXIAL 171 - 171 3.80 - 4.08 TSM BELOW YES 55 3

OD/NA 82.5 - 67.5 4.80 - 5.28 NA BELOW NO/WWI 56 1

ODINA 43 - 56 3.80 - 4.24 NA BELOW NO/WWI 58 1

OD/NA 347 - 359 2.52 - 3.00 NA BELOW NO/IPA 59 1

OD/CIRC 347 - 63 4.04 - 4.80 0.149 BELOW YES 59 2

OD/CIRC 156 - 206 7.66 - 8.08 0.149 BELOW YES 59 3

ID/AXIAL 159 - 159 8.04 - 8.48 TSM ABOVE YES 60 1

OD/NA 140 -294 4.56 - 6.68 NA BELOW NO/WWI 60 2

OD/NA 298 - 298 4.48 - 5.20 NA BELOW NO/WWI 61 1

ODINA 119 - 260 5.52 - 5.80 NA BELOW NO/WWI 61 2

ID/AXIAL 157-166 3.84-4.64 TSM BELOW YES 61 3

ID/AXIAL 141 - 141 4.72 - 5.16 TSM BELOW YES 61 4

ID/AXIAL 178 - 190 4.04 - 5.56 TSM BELOW YES 62 1

OD/NA 168 - 175 7.08 - 7.48 NA BELOW NO/WWI 62 2

OD/NA 186 - 206 7.00 - 7.44 NA BELOW NO/WWI 62 3

OD/NA 224 - 224 6.56 - 6.80 NA BELOW NO/IPA 62 4

NA 302 - 286 3.64-11.08 NA ABOVE NO/LOC 62 5

OD/NA 164 - 162 6.92 - 7.44 OD/NA BELOW NO/WWI 62 6

ID/AXIAL 318 - 88 4.88 - 6.68 TSM ABOVE YES 62 7

ID/AXIAL 118 - 226 2.68 - 5.64 TSM BELOW YES 63 1

PLP 63 2

ID/AXIAL 172-172 4.02-4.82 TSM BELOW YES 63 3

ID/AXIAL 358 - 358 4.70 - 5.22 TSM ABOVE YES 64 1

OD/NA 346 - 335 4.00 - 4.00 NA BELOW NO/WWI 64 2

ID/AXIAL 316 - 68 4.44 - 6.96 TSM ABOVE YES 64 3

ID/AXIAL 110 - 222 4.32 - 6.36 TSM BELOW YES 65 1

OD/CIRC 330 - 42 3.20 -5.08 0.152 BELOW YES 65 2

OD/CIRC 160 - 190 7.84 - 8.36 0.078 BELOW YES 65 3

ID/AXIAL 142 -198 4.68 - 6.48 TSM BELOW YES 66 1

ID/AXIAL 152-154 3.88-5.24 TSM BELOW YES 66 2

ID/AXIAL 200 - 197 4.16 - 5.64 TSM BELOW YES 66 3

ID/AXIAL 320 -328 5.60 - 6.76 TSM ABOVE YES 66 4

OD/NA 315 - 319 6.76 - 6.76 NA ABOVE NO/IPA 66 5

OD/NA 96 - 106 1.84 - 2.28 NA BELOW NO/IPA 66 6

ID/AXIAL 84 - 84 7.20 - 7.60 TSM ABOVE YES 66 7

OD/NA 80 - 104 5.00 - 5.88 NA BELOW NO/IPA 66 8

ID/AXIAL 306 - 348 5.60 - 6.72 TSM ABOVE YES 66 9

ID/AXIAL 118-216 3.60-6.36 TSM BELOW YES 67 1

ID/AXIAL 355-47 4.04-6.67 TSM ABOVE YES

  • LEGEND WWI - Indication evaluated as weld interface signal PLP - Possible Leak Path LOF - Indication evaluated as lack of fusion in weld IPA - Indication evaluated as anomaly such as material or weld artifact LOC - Loss of coupling with test surface in area NOISE - Noise in data either electrical or material related TSM - Shallow flaw that is too shallow to measure with existing probe spacing WVI - Volumetric indication in weld Penetration Ind #

Location /

Circ Extent Axial Extent Depth Above/Below Evaluated as Orientation Degrees Inches Inches J-Groove Root Flaw 67 2

OD/NA 230 - 234 8.20 - 8.48 NA ABOVE NO/IPA 67 3

OD/NA 182-187 7.76-8.16 NA BELOW NO/WWI 67 4

OD/NA 192 - 198 7.37 - 8.00 NA BELOW NO/WWI 67 5

OD/CIRC 343 - 27 3.16 - 4.00 0.094 BELOW YES 67 6

ODINA 156 - 245 5.40- 6.16 NA BELOW NO/WWI 67 7

OD/NA 187 - 193 7.72 - 8.00 NA BELOW NO/LOF 67 8

OD/NA 9 - 19 4.16 - 4.48 NA BELOW NO/LOF 68 1

OD/NA 344 - 0 5.00 - 5.40 NA BELOW NO/WVI - LOF

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1 81 28.5 4.32 5.12 134 134 0.80 N/A Axial 2

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Axial Circ.

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400kHz 400kHz Start End Start End Length Length

[ECUJ

[Dgr.j linchl

[inch]

[Dgr.]

[Dgr.]

[inch]

[inch]

1 224 28 4.68 6.92 5

14 2.24 0.21 Axial 2

100 21 5.20 6.36 35 43 1.16 0.19 Axial 3

138 29.5 5.40 6.52 59 68 1.12 0.22 Axial 4

224 24 3.52 4.60 139 139 1.08 N/A Axial 5

140 22 4.36 4.84 147 147 0.48 N/A Axial 6

336 24 3.44 5.00 159 159 1.56 N/A Axial 7

375 24 2.44 5.20 165 165 2.76 N/A Axial 8

314 26 4.04 5.64 171 174 1.60 0.07 Axial 9

205 24 2.52 3.04 176 176 0.52 N/A Axial 10 80 26 5.16 5.48 185 185 0.32 N/A Axial 11 53 28 2.72 3.12 191 191 0.40 N/A Axial 12 168 24 4.92 5.56 192 192 0.64 N/A Axial 13 272 28.5 3.64 4.72 200 203 1.08 N/A Axial 14 39 21 4.92 5.52 318 321 0.60 0.07 Axial 15 129 21 5.32 5.88 328 328 0.56 N/A Axial 16 223 23 4.52 6.32 343 347 1.80 0.09 Axial 17 186 22 4.64 5.52 353 353 0.88 N/A Axial 18 106 25 5.88 6.32 351 351 0.44 N/A Axial 19 93 25 7.60 7.92 159 159 0.32 N/A Axial

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RPVH CRDM Penetration Eddy Current Inspection CRDM Open Penetration Inspection - Indications in CRDM No. 63 Indication Amplitude Phase Axial Axial Circ.

Circ.

Axial Circ.

Comment NO.

400kHz 400kHz Start End Start End Length Length

[ECUI

[Dgr.]

[inch]

linch]

[Dgr.]

[Dgr.]

[inch]

linch]

1 365 21.5 3.80 4.80 172 172 1.00 N/A Axial 2

117 24 4.48 5.24 360 360 0.76 N/A Axial L 1-: I 1-1-

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Circ.

Axial Circ.

Comment NO.

400kHz 400kHz Start End Start End Length Length IECUI

[Dgr.]

[inch]

[inch]

[Dgr.]

[Dgr.]

[inch]

[inch]

1 141 31.5 5.96 6.60 5

5 0.64 N/A Axial 2

403 33 4.04 5.20 9

9 1.16 N/A Axial 3

98 31 5.48 6.36 15 15 0.88 N/A Axial 4

116 23 4.80 5.24 17 17 0.44 N/A Axial 5

321 29 5.60 6.80 24 24 1.20 N/A Axial 6

150 27 5.32 6.04 29 29 0.72 N/A Axial 7

67 21 5.40 6.00 45 45 0.60 N/A Axial 8

376 28 3.92 5.04 136 136 1.12 N/A Axial 9

121 29 5.40 5.92 155 155 0.52 N/A Axial 10 69 30 4.44 4.96 176 176 0.52 N/A Axial 11 457 32 3.96 6.04 196 202 2.08 0.15 Axial 12 438 27 4.36 6.04 338 338 1.68 N/A Axial 13 247 32

'5.72 6.48 347 347 0.76 N/A Axial 14 165 27 5.12 5.84 355 355 0.72 N/A Axial r.l.j-g~

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0 RPVH CRDM Penetration Eddy Current Inspection CRDM Open Penetration Inspection - Indications in CRDM No. 65 Indication Amplitude Phase Axial Axial Circ.

Circ.

Axial Circ.

Comment NO.

400kHz 400kHz Start End Start End Length Length

[ECU]

[Dgr.]

[inchl linch]

[Dgr.]

[Dgr.]

[inch]

linch]

1 134 26 3.52 4.56 135 135 1.04 N/A Axial 2

94 26 5.12 4.28 159 159 0.84 N/A Axial 3

159 23 4.92 6.00 166 166 1.08 N/A Axial 4

95 30 4.16 5.20 186 186 1.04 N/A Axial 5

24 24 7.48 7.68 222 222

-.20 N/A Axial 6

40 24 7.40 7.68 231 231 0.28 N/A Axial 7

89 22 6.76 7.48 248 248 0.72 N/A Axial 8

43 23 5.28 5.72 325 325 0.44 N/A Axial 9

13 7

5.48 5.72 8

8 0.24 N/A Axial it!.:

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Circ.

Axial Circ.

Comment NO.

400kHz 400kHz Start End Start End Length Length

[ECUI

[Dgr.]

[inchl linch]

[Dgr.]

[Dgr.]

[inch]

[inch]

1 89 29 6.76 7.20 83 83 0.44 N/A Axial 2

123 26 4.20 5.08 134 134 0.88 N/A Axial 3

308 22.5 4.04 5.64 137 148 1.6 0.26 Axial 4

469 19 3.12 6.12 142 164 3.00 0.29 Axial 5

104 24.5 4.52 5.32 171 171 0.80 N/A Axial 6

88.5 29 3.60 4.28 176 176 0.68 N/A Axial 7

369 23 3.33 6.24 185 185 2.92 0.31 Axial 8

58 30 3.20 3.80 202 202 0.60 N/A Axial 9

278 23.5 5.16 6.40 315 326 1.24 0.26 Axial f LI A.*.AI6t

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RPVH CRDM Penetration Eddy Current Inspection CRDM Open Penetration Inspection - Indications in CRDM No. 67 Indication Amplitude Phase Axial Axial Circ.

Circ.

Axial Circ.

Comment NO.

400kHz 400kHz Start End Start End Length Length

[ECUJ tDgr.]

[inch]

[inch]

[Dgr.]

[Dgr.1 linchl

[inch]

1 535 14 3.88 6.84 24 17 2.96

.165 AXI

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