ML19344E325

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Inservice Insp - Examination Summary for Prairie Island Nuclear Generating Plant - Unit 1,800705-18,Insp Period 2, Steam Generator Tube - Eddy Current Examination
ML19344E325
Person / Time
Site: Prairie Island Xcel Energy icon.png
Issue date: 07/28/1980
From: Dahlman L, Hansen D
NORTHERN STATES POWER CO.
To:
Shared Package
ML19344E324 List:
References
NUDOCS 8008280386
Download: ML19344E325 (39)
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{{#Wiki_filter:- _ _ _ _ _ - _ _ - _ _ _ O NORTHERN STATES POWER COMPANY INSERVICE INSPECTION - EXAMINATION

SUMMARY

FOR THE PRAIRIE ISLAND NUCLEAR GENERATING PLANT - UNIT I JULY 5 TO JULY 18, 1980 INSPECTION PERIOD 2 STEAM GENERATOR TUBE - EDDY CURRENT EXAMINATION COMMERCIAL SERVICE Prepared by: D. B. Hansen, Asst. DATE: 12-16-73 M & SP Engineer Lanny Dahlman, M & SP Specialist k REPORT DATE: Reviewed by: r L 7/28/80 P. J. p pos, $dpt. Materf61 and Special Processes Approved by: m [/,! 33y4T. Anderson, Gen. Tuperintendent, Prod. e Plant Maintenance i i DD b

NORTHERN STATES POWER COMPANY PRAIRIE ISLAND NUCLEAR GENERATING PLANT UNIT I - I N D E X - 1.0 Introduction 2.0 Discussion of Results 3.0 Examination Plan 4.0 Examination Method 5.0 Equipment and Materials 6.0 P1rsonnel Appendix A - Steam Generator No. 11 Eddy Current Examination Results and Tube Sheet Maps Appendix B - Steam Generator No. 12 Eddy Current Examination Results and Tube Sheet Maps Appendix C - Steam Generator No. 11 & 12 Accumulative Eddy Current Examination Tube Sheet Maps Appendix D - Table I Personnel Table II - Procedure Listing Table III Equipment and Materials Appendix E - Form NIS-1, Owners' Data Report for Inser-vice Inspection l 1

r INSERVICE INSPECTION EXAMINATION

SUMMARY

FOR THE PRAIRIE ISLAND NUCLEAR GENERATING PLANT UNIT I JULY 5 to JULY 18, 1980 1.0 Introduction This report is a summary of the steam generator tube eddy current examinations performed on the inlet and outlet of both steam generators at Prairie Island Unit I. The examinations were performed during the period of July 5 through July 18, 1980, after a tube leak developed on June 29, 1980. Prairie Island Unit I began commercial operation on December 16, 1973. The results of the eddy current examinations indicated that the leaking tube was an isolated case of tube wall deterioration within the tube sheet crevice, and that the general integrity of the steam generator tubes have been maintained. The Eddy Current examination program of the steam generator tubes was established and conducted with i the following objectives: (1) to identify the leaking tube (2) to detect any further tube degradation in the steam generator, and (3) to determine the general condition of the steam generator. This was the seventh inservice inspection conducted on steam generator tubes since the date of commercial operation. Eddy Current examinations were performed on both steam generators during 1974, 1975, 1976, 1977, and 1979; and on steam generator No. 12 during 1978. The steam generator tube sheet maps, examination method and results are summarized in the tables of the attached appendices as follows: Steam Generator No. 11 Appendix A o Eddy current examination results and tube sheet maps Appendix B - Steam Generator No. 12 Eddy current examination results and tube sheet maps Page 1 of 4

r .u Steam Generator No. 11 and 12 Appendix C Accumulative eddy current examination and tube sheet maps 2.0 Discussion of Results The identification of the leaking tube was accomp-lished by pressurizing the secondary side of the steam generator to 740 psig and visually inspecting the inlet and outlet sides through the manways for evidence of leakage. Leakage was found in tube, Row 2 Co: tmn 21, of the inlet side of steam generator No. 12. This was later confirmed by eddy current examination as a 100% through wall defect, approximately 1-3/4" in length and located within the tube sheet crevice about 10" into the sheet. The examination of the surrounding 163 inlet tubes, to the leaking tube, revealed no signs of tube degradation within the tube sheet crevice. Further examination of other inlet tubes for both No. 11 and No. 12 steam generators, revealed no indication of tube degradation in either the tube sheet crevice, the legs or U-bends of the tubes. The examination of the outlet tubes for both steam generators revealed no indication of tube degradation in the crevice area of the tube cheet. However, there were two outlet tubes (Row 35 Column 78, and Row 22 Column 86) in steam generator No. 11 that were detected to have tube wall degradation (34-35%) at either the first or second tube support, and one outlet tube (Row 28 Column 84) that had a small indication (<20%) at the 1st tube support for steam generator No. 12. These indications resembled those disccvered in the outlet tubes of Unit 2 steam gener-ators. (Refer to Prairie Island Unit 2 Inservice Inspection-Examination Summary, January 2 to Febru-ary 4, 1980; and Licensee Event Report RO-80-03, including Update Reports No. 1 and No. 2). A detailed listing of all indications and a comparison to previous examinations is included 'n Appendix A and B, for Steam Generato; No. 11 and 12 respectively. l The one defective tube (Row 2 Column 21, steam genera-I tor No. 12) was mechanically plugged, after completion of eddy current examinations, per Westinghouse mechanical plugging procedure by Westinghouse personnel. t Page 2 of 4 i i

i 3.0 Examination Plan The inspection program was c o n du c *;e d to comply with the requirements of Prairie Island Technical Spec-ification, and focused on the tubes adjacent to the leaking tube, the wedge area tubes, the tight radius U-bend tubes, and the periphery tubes of the outlet side. A tocal of 937 tubes in steam generator No. 11 and 1109 tubes in steam generator No. 12 were examined. (Refer to the tube sheet maps of Appendix A and B for details of the examination.) The type and extent of tube examinations that were performed during this inspection are as follows: Exam Exam Exam Tube Amount Frequency Extent Percentage Steam Generator No. 11 Inlet 176 Multi-freq. full length 5.19% tight radius + U-bends 137 Multi-freq. full length 4.04% U-bends + 1 Multi-freq. Past 7th .02% Support No. 11 Outlet 616 Multi-freq. Past 7th 18.18% Support 7 Multi-freq. Past 6th .21% Support Steam Generator 176 Multi-freq. full length 5.19% tight radius No. 12 Inlet + U-bends 140 Multi-freq. full length 4.13% U-bends 7 Multi-freq. Past 7th .21% Support 163 Multi-freq. Past 1st 4.81% Support No. 12 Outlet 617 Multi-freq. Past 7th 18.21% Support l, 6 Multi-freq. Past 6th .18% Support 4.0 Examination Method Westinghouse, along with technical support from Zetec Corporation, was contracted to perform and evaluate the data from eddy current examinations. The [ examinations were performed using Westinghouse's I Page 3 of 4 l l

r multi-frequency eddy current tescing system. A differ-ential coil multi-frequency is used for the inspection to detect localized degradation and to measure the extent of wastage, if any, occurring on the outside diameter of the tube surface. By employing four imposed frequencies, 400 KHZ (tube wall degradation), 100 KHZ (low gain to minimize / eliminate " unwanted" support plate and tube sheet signals), 100 KHZ (high gain for detection of cracks in the tube sheet) and 100 KHZ absolute (tight radius U-bends), on the probe during examination, information over and above minimum requirements were acquired and recorded for record purposes and for future evaluation to clarify tube conditions. 5.0 Equipment and Materials All equipment and expendable materials used in the examinations are listed by either serial number or type along with their respective calibration date or batch number in Table III of Appendix D. 6.0 Personnel Northern States Power Company contracted Westinghouse, with technical eddy current examination support from Zetec Corporation, to perform and evaluate the eddy currant examinations. Hartford Steam Boiler Insur-ance and Inspection Company, representing ANI, provided the Authorized Inspection. All personnel involved in the performance or evalu-ation of examinations are listed, along with their title, organization and ASNT level of certification, in Table I of Appendix D. Certifications for examination personnel are maintained on file by Northern States Power Company. Page 4 of 4

e e I APPENDIX A STEAM GENERATOR NO. 11 i EDDY CURRENT EXAMINATION RESULTS AND TUBE SHEET MAPS l O e .._.____,-..,_.m.,__

i EDDY CURRENT EXMtINATION RESULTS AND COMPARISON TABLE PRAIRIE ISLA'iD UNIT I APPENDIX A i STEAM GENERATOR NUMBER 11 PAGE 1 0F 7 INLET OR OUTLET Inlet DATE 7-22-80 E.uMINATION FREQUENCY multi-frea PR10R t.XAMINAT10 ROW COL INDICATION LOCATION COMPARISON INDICATION DATE N/A 17 15 DTSS TS 24 20 DTSS TS N/A 10 25 DTSS TS N/A 10 30 DTSS TS NONE 9/74 17 30 DTSS TS NONE 9/74 43 30 DENT & DTSS !#6 TSP & T3

  1. 6 NO CHANGE DENT #6 TSP 10/79 43 31 DENT
  2. 6 TSP
  3. 6 NO CHANGE DENT #6 TSP 10/79 43 32 DENT
  4. 6 TSP
  5. 6 NO CHANGE DENT #6 TSP 10/79 43 33 DENT
  6. 6 TSP
  7. 6 NO CHANGE DENT #6 TSP 10/79 44 33 DENT & DTSS
  8. 6 TSP & TS
  9. 6 NO CHANGE DENT #6 TSP 10/79 44 34 DENT
  10. 6 TSP
  11. 6 MINOR CHANGE DENT #6 TSP 10/79 10 35 DTSS TS NONE 9/74 17 35 DTSS TS NONE 9/74 44 35 DENT
  12. 6 & #7 TSP
  13. 6 MINOR CHANGE DENT #6 & #7 TSP 10/79 i
  14. 7 NO CHANGE 44 36 DENT
  15. 6 TSP
  16. 6 MINOR CHANGE DENT #6 TSP 10/79 45 36 DENT
  17. 6 TSP
  18. 6 NO CHANGE DENT #6 : TSP 10/79 AdontVIAliVNS:

LOCATION: INDICATION: EXTENT: ~ C.L. - Cold Leg STW - Between P.V. - Permability 1 - 1st Supp. H.L. - Hot Leg A - Above Variation 3 - 3rd Supp. 0.D. - Outside Dia. y - Below DTSS - Distorted Tube 7 - 7th Supp. T.E. - Tube End Sheet Signal U - U-Bend ( T.S. - Tube Sheet DENT - 42.5 Mils TRU - Tight Radius TSP - Tube Support FL - Full Length Plate CTR - Center l l

EDDY CURRENT ENAMINATION RESULTS AND COMPARISON TABLE PRAIRIE ISLAND UNIT I APPENDIX A STEAM CENERATOR NUMBER 11 PAGE 7 0F 7 INLET OR OUTLET Inlet DATE 7-22-80 EXAMINATION FREQUENCY oulti-frea FR10R rL\\MLNAIlu, I R0W COL INDICATION LOCATION CCMPARISON INDICATION DATE 45 37 DEhT

  1. 6 TSP
  2. 6 NO CHANGE DENT #6 TSP 10/79 i

l 10 40 DTSS TS DTSS-TS 10/79 NONE 9/74 17 45 DTSS TS NONE 5/75 17 60 DTSS TS Anut.V LAL Lou s: LOCATION: INDICATION: EXTENT: C.L. - Cold Leg 31W - Between P.V. - Per= ability 1 - 1st Supp. ~ H.L. - Hot Leg A-Above Variation 3 - 3rd Supp. 0.D. - Outside Dia. V - Below DTSS - Distorted Tube 7 - 7th Supp. T.E. - Tube End Sheet Signal U - U-Bend T.S. - Tube Sheet DENT - <,2. 5 Mils TRU - Tight Radius . TSP - Tube Support FL - Full Length Plate CTR - Center

r EDDY CURRENT EXAMINATION RESULTS AND COMPARISON TABLE PRAIRIE ISLAND UNIT I APPENDLX A STEAM GENERATOR NUMBER 11 PAGE 3 0F 7 INLET OR OUTLET Outlet DATE 7-22-80 EXAMINATION FREQUENCY multi-frea PRIOR r.XM11NAT10L R0W COL INDICATION LOCATION COMPARISON INDICATION DATE 8 2 ~DTSS TS N/A 9 2 DTSS TS N/A 9 3 DTSS TS N/A 8 4 UTSS TS N/A 9 4 DTSS TS N/A NONE 9/74 42 28 DTSS TS NONE 9/74 42 29 DTSS TS NONE 9/74 42 30 DTSS TS NONE 9/74 43 30 DTSS TS NONE 9/74 43 31 DTSS TS DENT @3 AVB 4/75 43 32 DTSS TS NONE 9/74 43 33 DTSS TS DENT 5" V#7 TSP 4/75 44 33 DTSS TS ( 44 34 DTSS TS NONE 9/74 l 45 38 DENT

  1. 6 & #7 TSP
  2. 7 CHANGED DENT #6 & #7 TSP 10/79 45 39 DENT
  3. 6 & #7 TSP
  4. 7 CHANGED FOR DEN #6 & #7 TSP 10/79 THE BETTER I

An dRtV 1A110N:> : LOCATION: INDICATION: EXTENT: C.L. - Cold Leg BTW - Between P.V. - Permability 1 - 1st Supp. H.L. - Hot Leg A - Above Variation 3 - 3rd Supp. 0.D. - Outside Dia. V - Below DTSS - Distorted Tube 7 - 7th Supp. T.E. - Tube End AVB-AHti-Sheet Signal U - U-Bend T.S. - Tube Sheet Vibratio t DENT -<2.5 Mils TRU - Tight Radius TSP - Tube Support Bar FL - Full Length Plate l CTR - Center

I l, EDDY CURRENT EXA!!INATION RESULTS i AND COMPARIS0N TABLE PRAIRIE ISLAND UNIT I APPENDIX A STE!44 GENERATOR NUMBER 11 PAGE 4 0F 7 INLET OR OUTLET 0utlet DATE 7-22-80 l EX/d-11 NATION FREQUENCY multi-freo FRiUR E.W!1.NAT10:, RO',1 COL INDICA ~ ION LCCATION COMPARISON INDICATION DATE 43 40 DENT

  1. 6 TSP N/A N/A 44 40 DENT
  2. 6 & #7 TSP 45 40 DENT
  3. 6 & #7 TSP
  4. 7 NO CHA';GE DENT #6 & #7 TSP 10/79 N/A 44 41 DENT
  5. 6 TSP 45 41 DENT
  6. 6 & #7 TSP
  7. 6 & #7 NO CHANGE DENT #6 & #7 TSP 10/79 46 41 DENT
  8. 5, #6,& #7 TS? #7 NO CHA'!GE DENT t/7 TSP 10/79 DENT 34" & 38"A TS N/A N/A 44 42 DENT
  9. 6 ISP NONI 10/79 45 42 DErr
  10. 7 TSP NONE 10/79 46 54 DENT
  11. 7 TSP N/A 44 55 DENT
  12. 7 TSP 45 55 DENT
  13. 7 TSP
  14. 7 NO CHANGE DENT #7 TSP 10/79 l

43 56 DENT

  1. 7 TSP N/A 1

N/A 44 56 DENT

  1. 7 TSP 45 56 DENT
  2. 7 TSP
  3. 7 NO CHANGE DENT #7 TSP 10/79 N/A 42 57 DENT
  4. 7 TSP l

43 57 DENT

  1. 7 TSP N/A

~ I ad udV1A1te.NS: LOCATION: INDICATION: EXTENT: C.L. - Cold Leg BT'i - 3etween P.V. - Permability 1 - 1st Supp. H.L. - Hot Leg A - Above vari 1_ ion 3 - 3rd Supp. f 0.D. - Outside Dia. v - Below DTSS - Distorted Tube 7 - 7th Supp. T.E. - Tube End Sheet Signal U - U-Bend T.S. - Tube Sheet DENT - C.5 Mils TRU - Tight Radius l TSP - Tube Support FL - Full Length Plate CTR - Center l l

t EDDY CURRENT E:Ol!INATION RESUI_TS AND Cu!:PARISCN TA3LE PRAIRIE ISLAND UNIT I APPENDIX A STEAM GENERATOR NU'!3ER 11 Pl.0E 5 0F 7 INLET OR OUTLET Outlet DATE 7-22-80 ELU!INATION FREQUENCY mult1-f req. PR10R i:.X.011NAI10: ROW COL INDICATION LCCATION COMPARIS0'.? INDICATION DATE N/A 44 57 DENT

  1. 7 TSP 45 57 DEhi
  2. 7 TSP
  3. 7 NO CEUiGE DENT #7 ISP 10/79 NONE 10/79 42 58 DENT
  4. 7 TSP 44 58 DENT
  5. 7 TSP
  6. 7 NO CHANGE DENT #7 TSP 10/7C 42 59 DENT
  7. 7 TSP
  8. 7 NO CHANGE DENT #7 TSP 10/79 44 59 DENT
  9. 7 TSP
  10. 7 NO CHANGE DENT #7 TSP 10/79

~ 42 60 DENT

  1. 7 TSP
  2. 7 NO CHANGE DENT #7 TSP 10/79 43 60 DENT
  3. 7 TSP
  4. 7 NO CHANGE DENT #7 TSP 10/79 N/A 44 60 DENT
  5. 6 TSP N/A 41 61 DENT
  6. 7 TSP l

42 61 DENT

  1. 7 TSP
  2. 7 NO CHANGE DEhT #7 TSP 10/79 43 61 DENT
  3. 7 TSP
  4. 7 NO CHANGE DENT #7 TSP 10/79 44 61 DENT
  5. 6 TSP N/A 10/79 i 41 62 DEhi
  6. 6 & #7 TSP N/A 10/79 42 62 DENT
  7. 6 & #7 TSP NONE 10/79 43 62 DENT
  8. 6 & #7 TSP
  9. 7 CHANGED DENT #7 TSP 10/79 44 62 DENT
  10. 6 & #7 TSP
  11. 7 MINOR CHANGE DEST #7 TSP 10/79

[ Alib Kr.V 1 Al' 10N b : LOCATION: INDICATION: EX*ENT: j lH.L.-HotLeg C.L. - Cold Leg STW - 3etween P.V. - Pernaaility 1 - 1st Supp. A - A*aove Variation 3 - 3rd Supp. 0.D. - Outside Dia. V - 3elow DTSS - Distorted Tube 7 - 7th Supp. l T.E. - Tube End Sheet Signal U - U-Bend T.S. - Tube Sheet DENT - < 2. 5 Mils TRU - Tight Radius TSP - Tube Support FL - Full Leagth Plate CTR - Center i l - _=

EDDY CURRENT ES"J!INATION RESULTS AND CO!'PARISON TABLE PRAIRIE ISLAND UNIT I APPENDIX A STEAM GENERATOR lC13ER 11 PAGE 6 0F 7 INLET OR OUTLET Outlet DATE 7-22-80 EXAMINATION FREQUENCYmulti-frea. PRIOR EXA:u:nt 10;, R0W COL INDICATION LOCATION COMPARISCN INDICATION DATE 39 63 DENT

  1. 7 TSP N/A 41 63 DENT
  2. 6 & #7 TSP N/A 42 63 DENT
  3. 6 & #7 TSP
  4. 7 CHANGED DENI #7 TSP 10/79 38 64 DENT
  5. 7 TSP N/A 41 64 DENT
  6. 6 & #7 TSP N/A 42 64 DENT
  7. 6 & #7 TSP
  8. 7 CHANGED DENT F7 TSP 10/79 43 64 DENT
  9. 6 & #7 TSP
  10. 7 NO CHANGE DENT #7 TSP 10/79 N/A 41 65 DENT
  11. 6 & #7 TSP 42 65 DENT 16 & #7 TSP
  12. 7 NO CHANGE DENT #7 TSP 10/79 43 65 DENT
  13. 6 & #7 TSP
  14. 7 CHANGED DENT #7 TSP 10/79 N/A 41 66 DENT
  15. 6 & #7 TSP N/A 42 66 DENT
  16. 6 TSP i

41 67 DENT

  1. 6 & #7 TSP
  2. 7 MINOR CHANGE DENT #7 TSP 10/79 i

i 42 67 DENT

  1. 6 TSP
  2. 6 NO CHANGE DENT #6 TSP 10/79 l

l N/A 39 68 DENT

  1. 7 TSP 41 68 DENT
  2. 6 & #7 TSP
  3. 7 CHANGED DENT #7 TSP 10/79 l

35 78 34%

  1. 2 TSP N/A

-_I l l ndsacVtA 30N6: l LOCATION: INDICATION: EXTE5T: l C.L. - Cold Leg BTW - 3etween P.V. - Permability 1 - 1st S'u p p. H.L. - Hot Leg A - Above Variation 3 - 3rd Supp. i 0.D. - Outside Dia. V - 3elow DTSS - Distorted Tube 7 - 7th Supp. T.E. - Tube End Sheet Signal U - U-Bend T.S. - Tube Sheet DENT - < 2.5 Mils TRU - Ti;;ht Radius TSP - Tube Support FL - Full Length Plate j CTR - Center I

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?~7 INLET OR CUTLET Outle

CATE 7-22-80 EXAMINATION FREQ';ENCY.u1*_* -frea. t.M Gr. :.).A:a:.a. % :, R0'a' COL INDICATIG:3 LC0ATION CO):PARISON

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CATE N/A 28 82 P.V. BT'4 #2 & #3 TS N/A 22 86 35%

  1. 1 TSP l

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l 1 I I l i APPENDIX B STEAM GENERATOR NO. 12 EDDY CURRENT E:ULMINATION RESULTS AND TUBE SHEET MAPS S

EDDY CURRENT EXXIINATION RESULTS AND COMPARISON TABLE PRAIRIE ISLAND UNIT I APPENDI'< B STEAM GENERATOR NUMBER 12 PAGE 1 0F 6 INLET OR OUTLET Inlet DATE 7-22-80 EXAMINATION FREQUENCYmulti-freq. PRIOR EXAMINAT102. R0W COL INDICATION LOCATION COMPARISON INDICATION DATE 17 35 DENT TS NONE 9/74 l 17 40 DENT TS NONE 9/74 l 45 41 DENT

  1. 7 TSP SIGNAL DISTORTED 10/79 17 45 DENT TS NONE 9/74 l

17 50 DENT TS NONE 9/74 17 55 DTSS TS NONE 9/74 i 2 75 P.V. 18"A #4 TSP P.V.18" A #4 TSP 10/79 17 80 DTSS TS N/A l 16 83 DTSS TS N/A 14 84 DTSS TS NONE 3/76 16 84 DTSS TS N/A 16 85 DTSS TS N/A 9 93 DTSS TS NONE 9/74 2 21 100% 10" in TS NONE 10/79 l l u AddRt.V 1All0N S : LOCATION: INDICATION: EXTENT: C.L. - Cold Leg BTW - Between P.V. - Pe rmability 1 - 1st Supp. H.L. - Hot Leg A - Above Variation 3 - 3rd Supp. 0.D. - Outside Dia. \\/ - Below DTSS - Distorted Tube 7 - 7th Supp. T.E. - Tube End Sheet Signal U - U-Bend T.S. - Tube Sheet DENT - < 2. 5 Mils TRU - Tight Radius TSP - Tube Support FL - Full Length Plate CTR - Center ---,-----,---,n.---.,,- ---.-----.-,-n.

I l l EDDY CURRENT EX.U!! NATION RESULTS AND COMPARISCN TA3LE PRAIRIE ISLAND C';IT I AP?ENDIX 3 STEAM GENERATOR NUM3ER 12 PAGE 2 0F 6 INLET OR OUTLE'" Outlet DATE 7-22-80 EXAMINATION FREQUENCY =ulti-f ree. PRIOR E.LuiiNAIl0:, R0W COL INDICATION LCCATION COMPARISCN INDICATION DATE 16 7 1.V. 3" TS N/A 18 7 P.V.

  1. 5 ISP N/A l

24 10 P.V. 25"A #4 TSP N/A 25 11 P.V. BTW #5 & #7 TSP N/A i l 17 15 DENT T.S. N/A 36 19 P.V. 7" A #5 TSP N/A 17 20 DEhT IS N/A 25 20 P.V. 46"A #4 ISP N/A 24 25 DENT TS NONE 5/75 10 30 DTSS TS NONE 9/74 20 30 DEST TS NONE 9/74 21 30 DENT TS NONE 3/76 24 30 DENT TS NONE 9/74 I ( l 42 30 DENT

  1. 1 ISP N/A I

I NONE 9/74 20 31 DEhT TS NONE 9/74 l 21 31 DENT IS i 22 31 DENT IS NONE 9/74 .uad.v iAi eas : LOCATION: INDICATICN: EXIENT: i l l C.L. - Cold Les 3!'i - 3etween F.V. - Per ability 1 - 1st supp. I H.L. - Hot Leg A - Above Variation 3 - 3rd Supp. 0.D. - Outside Dia. v - 3elew DTSS - Dister:ed Tube 7 - 7th Supp. T.E. - Tube End Sheet Signal U - C-Send T.S. - Tube Shee: DENT - < 2. 5 Mils TRU - Ti;h: Radius TSP - Tube Support FL - Full Length Plate CTR - Center I I _..,..._,_,,,-._____.,4, ..c,

EDDY CURRENT SY_'2:! NATION RESULTS AND CCMPARISCN TA2LE PRAIRIE ISLAND UNIT I APPENDIX g STEAM CE::ERATOR NUM3ER 12 PACE 3 0F 6 INLET OR OUTLET Outlet DATE 7-22_go EXAMINATION FREQUENCY:nulti-free. . divi s.GMiNA!ic: RCW CDL INDICATICN LOCATION COMPARISCN INDICATIO:: DATE 42 31 DENT

  1. 1 TSP N/A 42 32 DENT
  2. 1 TSP N/A 44 34 DEhT
  3. 1 TSP N/A i

10 35 DTSS TS NONE 3/77 i 17 35 DENT TS NONE 9/74 24 35 DENT TS NONE 3/77 31 35 DENT TS N/A 43 35 DENT

  1. 1 TSP N/A 44 37 DENT
  2. 1 TSP N/A i

10 40 DEhT TS NONE 9/74 17 40 DENT TS NONE 9/74 24 40 DENT TS NONE 9/74 45 40 DENT

  1. 7 ISP NONE 10/79 10 45 DEhT TS NONE 9/74 17 45 DEST TS NONE 9/74 24 45 DENT TS NONE 9/74 31 45 DENT TS.

N/A ad o ne.i t A t 10:a : LOCATION: INDICATION: E:CEST: C.L. - Cold Leg BTW - 3etween P.". - Per: ability 1 - 1st Supp. H.L. - Hot Leg A - Above Variation 3 - 3rd Supp. 0.D. - Outside Dia. V - 3elow DTSS - Distorted Tube 7 - 7th Supp. T.E. - Tube End Sheet Signal U - U-3end T.S. - Tube Sheet DENT - < 2.5 Mils TRU - Ti;;ht Radius TSP - Tube Support FL - Full Length Plata CTR - Centar I i y ,-ry-,w,--,,_.-.n.------ ,,w., ,,-,we -n-ww,,w _ w,-,,,, --,e.., ,,-,,,-,_w.e,-.,,---m,,----- ---,,,-en--..,----e,

,--v,----------

EDDY CURRENT E.U2:INATION RESULTS AND COMPARISON TABLE PRAIRIE ISLAND UNIT I APPENDIX n STEAM GENERATOR NUMBER 12 PAGE a CF 6 INLET OR OUTLET Outlet DATE 7-22-80 EXAMINATION FREQUENCY multi-freq. l'R10R i:.. NAM 1:'AT102 RON COL INDICATION LCCATION COMPARISCN INDICATION DATE 10 50 DTSS TS N/A t 17 50 DENT TS N/A 24 50 DENT TS N/A 31 50 DTSS TS N/A 10 55 DENT TS N/A 17 55 DENI TS N/A 31 55 P.V. 32"A #4 TSP N/A l l 45 55 DENT

  1. 7 TSP NONE 10/79 l

l 45 56 DENT

  1. 7 TSP NONE 10/79 l

I 44 57 DENT

  1. 7 TSP N/A 45 57 DENT
  2. 7 TSP
  3. 7 NO CHANGE DENT #7 TSP 10/70 43 58 DENT
  4. 7 TSP
  5. 7 NO CHANGE DENT #7 TSP 10/79 44 58 DENT
  6. 7 TSP
  7. 7 NO CHANGE DENT #7 TSP 10/79 i

l 45 58 DENT

  1. 7 TSP
  2. 7 NO CHANGE DENT #7 TSP 10/79 1

42 59 DENT

  1. 7 TSP NONE 10/79 43 59 DENT
  2. 7 TSP
  3. 7 NO CHANGE DENT #7 TSP 10/79 l

l 44 59 DENT

  1. 7 TSP
  2. 7 NO CHANGE DENT #7 ' TSP 10/79 aconr.V tat was:

I - LOCATION: INDICATICN: EXTENT: C.L. - Cold Leg 31W - Between ~ P.V. - Permability 1 - 1st Supp. H.L. - Hot Leg A - Above Variation 3 - 3rd supp. 0.D. - Outside Dia. V - Below DTSS - Distorted Tube 7 - 7th Supp. T.E. - Tube End Sheet Signal U - U-Eend T.S. - Tube Sheet DENT - < 2. 5 Mils TRU - Tight Radius TSP - Tube Support 7L - Full Length Plate CTR - Center .,,, _ -,,, - - _ - -.. _ _, _ _ _, _ _., _, _ _,, _. -, -,,.. _ _.. ~, ,,,__.,.--,-_,,.,_m,-.,-m,w.-,.,,,,m.,,,,.-_--,,,m-m,,

EDDY CURRENT E:Odi1 NATION RESULTS AND COMPARISON TABLE PRAIRIE ISLAND UNIT I APPENDIX B STEAM GENERATOR NUMBER 12 PAGE 5 0F 6 INLET OR OUTLET Outlet DATE 7-22-80 EXAMINATION FREQUENCYmulti-frea. c'R10R W J112.AT102 ROW COL INDICATION LOCATICN COMPARISON INDICATION DATE 45 59 DENT

  1. 7 TSP
  2. 7 NO CHANGE DENT #7 TSP 10/79 10 60 DENT TS NONE 3/77 17 60 DENT TS N/A 42 60 DENT
  3. 7 TSP NONE 10/79 43 60 DENT
  4. 7 TSP
  5. 7 NO CHANGE DENT #7 TSP 10/79 44 60 DENT
  6. 7 TSP
  7. 7 NO CHANGE DENT #7 TSP 10/79 42 61 DENT
  8. 7 TSP SIGNAL SATURATED 10/79 43 61 DENT
  9. 7 TSP SIGNAL SATURATED 10/79 44 61 DENT
  10. 7 TSP
  11. 7 CHANGED DENT #7 TSP 10/79 42 62 DENT
  12. 7 TSP
  13. 7 CHANGED DENT #7 TSP 10/79 l

l 43 62 DENT

  1. 7 TSP
  2. 7 CHANGED FOR THE DENT #7 TSP 10/79 l

BETTER 42 63 DENT

  1. 7 TSP NONE 10/79 43 63 DENT
  2. 7 TSP NONE 10/79 NONE 10/79 42 64 DENT
  3. 7 TSP NONE 10/79 42 65 DENT
  4. 7 TSP NONE 10/79 43 65 DENT
  5. 7 TSP j

1 1 34 78 DEhT

  1. 6 TSP N/A AudREVtA nchs:

~ '- ~ LOCATION: INDICATION: E: CENT: C.L. - Cold Leg BTW - Setween P.V. - Permability 1 - 1st Supp. H.L. - Hot Lc; A - Above Variation 3 - 3rd Supp. 0.D. - Outside Dia. V - Below DTSS - Distorted Tube 7 - 7th Supp. T.E. - Tube End Sheet Signal U - U-3end T.S. - Tube Sheet DENT - <2.5 Mils TRU - Tight Radius TSP - Tube Support FL - Full Length Plate CTR - Center . ~..

.m EDDY CURRENT EM.'JIINATION RESULTS AND COMPARISON TA3LE PRAIRIE ISLM;D UNIT I APPENDIX B STEAM GENERATOR NUMBER 12 PAGE 672 6 INLET OR OUTLET Outlet DATE 7-22-80 EXAMINATION FREQUENCY multi-freq. PRIOR EXAMANATIV:< ROW COL INDICATION LOCATION COMPARISON INDICATION DATE i 1 28 84 ( 20% 0.D. #1 TSP N/A l l l l l <wonr.s. At tuas : ~ LOCATION: INDICATION : EXTENT: C.L. - Cold Leg BTW - 3etween P.V. - Per= ability 1 - 1st Supp. H.L. - ilot Leg A - Above Variation 3 - 3rd Supp. 0.D. - Outside Dia. V - Below DTSS - Distorted Tube 7 - 7:h Supp. ] T.E. - Tube End Sheet Signal U - U-3end i T.S. - Tube Sheet DENT - < 2. 5 Mils TRU - Tight Radius TSP - Tube Support FL - Full Length Plate CTR - Center I i ..-_-__,_.v - ~, - - - - -.- -w,--

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SERIES SI 93 9189 S!'\\S 83 Hi 1911151318 L9 t,7 t.5 L3 Lt 59 5155 73 5149 4145 43 41313? 35 33 3129 ?! 2S 23 21 I? Il 151311 9753/ COLUiANS y 92 90 M U4 M ts? to 19 1s 14 17 10 t.6 66 L4 Q tf $8 TL $4 ',2 50 40 48, 44 47 Aes 's SL SA 52 30 to tt to it to so of, 14 Iz to o is a 2 A ~ / 7 44 a P4 s m,/ l-V j 1 -.g

5._,,

2 is 1 / ll 11 ll 3-ll - ll. ll 52 p'!\\ - 51 j /pI' / ll ll ll - j hj 3 1 1 3 rr f A /t -za 3 2, / = l*

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is a si n i n n ii ii n i t ! nT 1 i. jf; p f .; __ _ - w,3 4 i h 84 $ -',3 g ili i si - si i si i,i ~ si is ii 8 ii si si - is n / 1 p / --c ]' L , - ~ - ' ' 1 3 l h s s -4 _ __t!.T_ --.rFQ_...__ _t.u2tv4<. vih$'.inyypjv.n'.w.yadit/t. pN2.dlp$,v.hsy,' ad-).2 i rg.4u.wwn.v.swe ' T* ^ _ _.. f-Eb J51___ . -J=s Frairic I s l.u f Nac 8c.or s. *u r.st le.g F l...et tiul e B _ J =' ROWS t :- - 9 lL',i,"lf,*,,7ll.'l 'A' 'l,!',t.','",;h N0ZZLE 4-M ANWAY R j. r O a '.h. e in :p ce cel tiie w 7eh Sciop+et Q tulra !.e use cted a1 a n'agt Le h Suttoe L @ PIupaed to d.ete

e l i l i i I 1 1 l i l l l APPENDIX C STEAM GENERATOR NO. *11 & 12 ACCUMUI.ATIVE EDDY CURRENT l EXAMINATION TUBE SHEET MAPS i a

SERIES 51 ?3 9189 6165 US of 1917151510 69 67 l>$ 65 bl 59 Si S5 E3 59 49 4145 43 4/ 39 3735 33 3I 19 2125 23 El IP 11 IS I3 ll 9 '! S 3 / COLUMNS 94 91 90 on 8L SA 62 60 16 14 14 It 10 68 46 L4 L2 WB 58 76 $4 $2 50 49 46 44 42 40 Sn 56 54 52 Sn 20 16 tA 22 to I6 16 14 12 10 o lo 3 2 l g

y 4,,

/; mw aww i _ o o oo, m m 44 j h IE 41 l j ,'ip H p H H s --1L 4 g4 _ _,, 4 1 . A oon. 3, - m o<> <n> <w> <m> <ggps c. 3a t y j / - < H i o o o o o o o so ll il < u q 5. a, $ / Il d ~ ~ ~ i/I i l <[! i l I d ', l', ! . Il l l [$i l l /'< l ll l l s 35 ,t. o . o g i / n a o 4 < i - s 32 s 4><> t> 1> ild> t> 4> MpqH H H M, - 4) i E / l l l l : l l : : l l l

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jt.j ( J t,_jj 4>

1> ,..% s 3 , -N Si i o,h[ 4 4 7 5a.gm ,i ~ ~ o S s . v . 4 d 29 / \\ 2a / o _ o ~ o n 4 M I / i j l 1 ~ . jl.~ l l.i'l l .. j/> l l l l l l 9 l 1 P f j(l p y%j-W l O-2: i r, u, 21 l- / o qt .U ~ l l ~,C 24 3 s , o p q o o , f I 4 hi ll lli ll a 'o qi 73 / ;,l.' i l, ~ ~ w \\ 2' M,w. V 'i/'i i l V,,, 2n p E 4w, _j! g 20 i ! - i l d ! i b ! ! l ! l ! J ! - ! b IM;,iiYnj l ll l l y- / ..L

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jI ".o j Lio" '8 4 . at & o o o o m .-r o. o j o o o .o . o e, m o. . o n, i ( o o o o o 6 is ,';a,.a 79 ~ t > ), l4 y qi n l L 1 l l l l.~ : : . l l 1 ; w i '3 o . o o o ,d d i2 l l \\ H M !? ii L ! ;;

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q, I -. o o o o o o o o ,o ,4 1 ,s, o ..o o o o o o l 1 a j F% ( > - (> (> - (> (> q q .m / lN > > l - o o - o -- o - o o - o g 9 q . o --.; . m t MM d j1 i k o o a o o o n s ,lla lllllllllllllllllllHll wllwlllwllllll w dllll HilIllN(Jilllllbil llililllil lllIil l lIF m m e l l l Q I ? -4 i i ~ 1__ __} _ L___ __,=-_i___ __J_ ggWg j ACLUHutATIVE TOTAL OF TURES INSPECTFD Til DATE (Jus.y IHun

  • -M ANWAY l'E','" Mun"?,;; S;' ';'.'"" "'"' """ '

NOZZLE + 1 4tW) Elix Emaninations: 1 or Tubes Inspected t hrough U-Bened f & Mult i-f respect cy or Tubes Inspected to Top (7th) Support j Q Tubee Inapected to First Support Oe Tuben Plugged to page 4 1 i }

l SERIES SI 1 i 15 ?! b) (1*1' H3 osi !? 11151518 L1 Li LS LS 6159 5! $513 54 49 4145 43 4139 3135.53 31111125 23 21 ty 11 IS 1311 9153/ COLUMNS i >< 11 90 n 8t, n4 nt so to ts 14 it to ss ss 44 gg yt so SL $4 52 so se As 44 41 Aa sn $$54 St $n to ti 14 tt to le IL I4 gg to o le a 2 Mh l . bp@hpgD"E d p l A -45 ~* 5 fD s 95 . &df 4z "'d' No e-y Q p d' ,tpud w i . p h 4o e , 1 ,1 n ,1 %.4 hp5 C X se i l -5 P ( o o m o n 4 / d N

s. 55 l

/ ffi f f o o o o n o ll ll ll ll[ { jl ll Il' g'n oll 4 n o i n sr '8 g @,M 'i ll d d N so lb i n n o o o y i I 4 : h I s es " f l'l ,t hpi.j'{ n' ii it' " lli i mi d dl idl lli ll ll ll d' ll q q lu ,,, n _] n n n n 24 t / h d b /~ bd n o di o a o o o o o o o o n . n . o o n. ) (i s - - " 21 ii ' n l Rd \\ l / 9 il si o dbi b d i lf U II S I I II II S i o i '* i9 ll n h:j \\ n n i n i is l / M l l l l l l l l l n n n d ' n" n i," ) '5 1 - p n n i4 = .,'i l ? q i2 l i f.' i l l l Il is i l l l l l lli ll ll ll oll lli ll ll n H io o o n i Wl l n u o { ' h$ li 11 11 li 11 l l il ll 1 1 Il ll ll 11 11 Il il di ll 0 _ y, 7 j h 13 - i. 3 0 a m,um ma -4 4 p w m m l 3 tCh r zwtyW1

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_a wmvare M i =L __ _ _ f. _ _ _, - : ROWS ACatetsl AllVE TUTAI. isF IUDF5 f f85FPt1pp Tu I Alt g.sess.y ge nop e + M ANWAY r""' '>i-d ~im c - isas rii""' NOZZLE i SI EAM e4 Np flA rtHI pert. l l *tHrt i.R f" 4 4085 F8la Fueminet lisen s $ Tulee leaper teil llorensah U llend @ rl.>pp 4 to last a i & t*s t t 4 - f s c.e. ...y M at g Tut.ee Inspet eed Ia Top (7:1.) suppos a [,*] Tul>ee inspec ted to Fleet suppost Tiet.o.m Is egee, t ed t o 6t h f4ug1=es t i 1

1 I i SERIES Si i 1 ? 93 9189 B16S 83 81 !? 11151518 L9 67 65 65 bl $9 5155 E3 $149 4145 43 4139 3135 33 31212125 23 21 IP 111513 ll 9753i 'M 91 90 on 86 SA at 60 78

11. 14 it 10 68 66 LA Lt 1/ So *L, 54 52 So 48 46 44 42 40 56 SL 54 52 50 26 n 24 22 to le 16 I4 It 10 o lo a

Z i e i ---'~ ' ' '*-yz,' p" .u.1MMMMMMMMMMMMHL-4 88 i i n 4 n i p s. 44 j bi u li u l H u qqMg;- s - 4 g, N g.- 45 p p p n w i i. / .]Q _ ~ id-M (> q> q> () p -5._ 4g f 3 d30 Hp(> 39 (M> (><> (> (HD (> -N m-_. 38 4 f i (> S l 3 37 / 4 H i I 1 1 1 I (> I (> ( M 6 -s 5(, 3 / 1 N H () e l t I q -( l M y q a$ 1 / i FI H H (> 4 l -(i l (> i 4 i i >i i w p p 1 / 4 e u 8 t) > ()- () > t) t) i i j / i H d H I (> 4> H> 1 > (> 4>.<> (>i N > . (p 4 <> () i q) i H i l N 35 n" l.<> <> (>-1> H .(> (> i' l i - s 32 r / 1N>(> >I i (H> (> i t k ig qb t () 'jg q gjg [ < hq g .i g [ q q).(Mt i n H i H it - g - - 51 i y--( 1 p t ,G1 I.Nb .f 4 L , r:- j; yf j7 :, ,p,) 30 j ), fdlh 'hh hh >lkj l / (>- A D.-,, j,-y; ,,C.(4 apr,+l'<,,. 1 4> (> ~ (> ), k 1> (> I '7 ,y _.-()- t .- y 2g, 23 3 / ( f 19..py 'dg. r, E,r.,(p,. l> i p 2] ) 1 < (> 4) 'ti g.

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  • l l

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l SERIES 51 93 9189 6165 63 nl 11171513 ll L9 L165 65 6159 5155 E3 54 49 4145 43 4139 3135 33 3129 2125 23 21 IP 11 IS 1311 9 7 5 3 / COLUMNS a '/4 92 90 88 84 84 82 so Te is 71 il Fo LS && 64 L2 /d58 54 54 52 50 4e 46 44 42 40 56 54 54 52 50 28 21 24 22 20 to I4 12 to 8 t, 4 2 I i j k k II5 qC ,k@h' M 1g: - W @'cana ML.? %;

    • y g

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hb bS$! ll ll ll ll ll ll 5 d 30 y kl@ T-ii n un ii i i / li N I 55 i s j jf lf N gg ll ..]l __j . 3n L. .- 1j N @ f 5 a I l /- f g o_ o o o 7 p _ ll. jl - jl ll ijpgfp@ ( ~ n~r 38 " " 1 rp I k - - - 4> l> ik 4> 4> 4> (> $h f f f e r Ib 4> 1> 4> - lkh A k 27 /hk - i 8 v l ( h%jhN]yjj M h ~ 2I 25 ii.- ir o no'! nll n o'! An o , o o n j 3 1_..._. 1 ~ 1b.~)I I )I . 1I 1I j{,'.l( fjfhf' ?%'l 1 [ 22 / l-/ k.'k 772 7 b " ~ ~ II ll Il l ll . lf_ll h k 'qp qp z / hh 20 >...ll _ ll l I - ll .. lf 1 i i / r gg ll 'd[ - ( l-l ) ll ll ll i li ^^ ll.

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  1. "N

!!68 8^4h_.tNM - ~g -- L_gVVV'M h.__ _ _ M_ _ _ I 4 u__ _ _ >=L _ _ __JEE ROWS ACCUHUt.ATIVE T(rtAl. OF TUBF.S INSPt'CTED TO HATE 4 HILY 1980)

  • -- M ANWAY M'*d"Z"ll*" "o""O'."' ""' """ '

NOZZLE

  • 400 Ittia Examinatlon Tutees Inspected 1hrount. U-Bend 6 Mael t i-f seenaency M or Tut,ee Inspected to Top Us ti) Suppen t O l'lispged to Inste j

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i APPENDIX D T \\BLE I - PERSONNEL LISTING TABLE II - PROCEDURE LISTING TABLE III - EQUIPMENT AND MATERIALS 1 I a l i l l - - - - - - - - - - - - - - - - - - - - - - - - - - - ~ ~ - - - - - - - - - - -

NORTHERN STATES POWER COMPANY APPENDIX D PRAIRIE ISLAND UNIT I TABLE I PERc0NNEL LISTING PAGE 1 0F 1 EXAMINER TITLE ORGANIZATION ASNT LEVEL ET V.P. BURKE COORDINATOR W I M.B. CORTESE TECHNICIAN W I G.J. FERENCHAK TECHNICIAN W II D.R. FRANCIS TECHNICIAN W I T.A. PFARR TECHNICIAN W I C. SWANGO TECR11CIAN W II G. TESTA TECHNICIAN W I D.J. TOMMARELLO TECHNICIAN W I E.J. HAKO EVALUATOR ZETEC (2) IIA E.O. McKEE EVALUATOR ZETEC IIA L.C. DAHLMAN M&SP SPEC. NSP D.B. HANSEN ASSIT M&SP NSP ENGINEER J. WILLIAMS ANII HARTFGRD STEAM BOILER INSPECTION AND INSURANCE CO. FOOTNOTES: (1) Organization: Westinghouse Electric Corporation Nuclear Services Division P.O. Box 2728 Pittsburgh, Pa. 15230 (2) Organization: ZETEC P.O. Box 140 l Issaquan, Washington 98027 l l

NORTilERN STATES POWER COMPANY APPENDIX D PRAIRIE ISLAND UNIT I TABLE II PROCEDURE LISTING PAGE 1 0F 1 PROCEDURE NUMBER FIELD PROCEDURE TITLE PLANT APPROVAL FIELD CllANGE CllANGE DESCRIPTION AND REVISION CilANCE DATE REMARKS 1 1 MRS 2.4.2 Gen-23 NONE Multi-frequency Eddy-7-03-80 N/A Rev. 2 Current Inspection Of ) Steam Generator Tubing-Preservice and Inservice MRS 2.4.2 Gen - 19 N0*lE Installation and removal 7-03-80 N/A j Rev. 0 Of Eddy Current Position-ing Devices i l i 1 I 1 i i I i i

NORTHERN STATES POWER COMPANY APPENDIX D PRAIRIE ISLAND UNIT I TABLE III EQUIPMENT AND MATERIALS PAGE 1_ 0F 2 MATERIAL OR TYPE OR SERIAL CALIBRATION EQUIPMENT NUMBER DATE OR BATCH REMARKS NUMBER MIZ 12 Main Frame S/N 0668 4-11-80 0557 2-12-80 0661 4-10-80 MIZ 12 Freq. S/N 0669 4-11-80 Plug In 0670 4-11-80 0671 4-11-80 0672 4-11-80 0539 2-15-80 0561 2-12-80 0574 2-11-80 0665 4-10-80 0663 4-10-80 0662 A-10-80 0664 4-10-80 0576 2-11-80 MIZ 12 Mixer S/N 0673 4-11-80 Plug In 0674 4-11-80 056i 2-11-80 0563 2-11-80 0666 4-10-80 0667 4-10-80 MIZ 12 Display Mod. S/N 0643 4-1-80 so42 4-1-80 0678 4-1-80 TEK 5111 Stor. S/N 0266 4-3-80 Scope 0151 4-23-80 0459 4-8-80 Tape Recorder S/N 0649 4-1-80 Recal. on Site 7-11-80 HP 3968AZ 0648 4-1-80 Brush MK 220 S/N 0645 4-1-80 0644 4-1-80 0154 3-21-80 0589 5-16-80 Standards Inconel 600 S/N I-32-W Heat # 8791 Inconel 600 S/N 0100 Heat # 8939 Inconel 600 S/N Z831 Heat # 1019 l' Zetec Vector Ana. S/N 006 3-28-80 Model 3 MIZ 12 Mixer S/N 057 3-28-80 Plug In 056 3-28-80

NORTHERN STATES POWER COMPANY APPENDIX D PRAIRIE ISLAND UNIT I TABLE III EQUIPMENT AND MATERIALS PAGE 2 0F 2, MATERIAL OR TYPE OR SERIAL CALIBRATION EQUIPMENT NUMBER DATE OR BATCH REEutKS NUMBER Zetec cont. MIZ 12 Display S/N 027 7-3-80 Plug In ~ Ocilloscope S/N B119925 7-3-80 TEK 5111 Tape Recorder S/N 004 3-17-80 E? 3768AZ e S i

) APPENDLX E FORM NIS-1 OWNERS' DATA REPORT FOR INSERVICE INSPECTION l l o 1 .. _.,. - -. _ _ - - _ _ _ _ _, _ _ _ _ _ _ _. _ _ _. _,_.- _.. _.. _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _. _ _ _. _ _ _ _ _ _ _... - _ _ _. _ _. ~ - _..

s, FORM NIS-1 OWNERS' DATA REPORT FOR INSERVICE INSPECTIONS (As Required by the Provisions of the ASME Code Rules) 1.) Owner NORTHERN STATES POWER COMPANY Address 414 NICOLLET MALL; MINNEAPOLIS, MLNNESOTA 2.) Piant PRAIRIE ISLAND NUCLEAR GENERATING PLANT - UNIT I Address WELCH, MINNESOTA 3.) Plant Unit I 4.) Owner (Certificate of Authorization) 5.) Commercial Service Date 12-16-73 6.) National Board Number for Unit 7.) Components Inspected Manu fa c turer Component or Manu fac turer or Installer State or Na tiona l Apourtenance or Installer Serial No. Province No. Board No. STEAM GENERATOR TUBING S/G No. 11 Westinghouse 1101 68-24 INLET TUBE EXAMINATION EXAMINATION EXAMINATION AMOUNT FREQUENCY EXTENT PERCENTAGE 176 multi-freq. Tight Radius 5.19% U-Bends l 137 multi-freq. Around U-Bends 4.04% 1 multi-freq. Past 7th Support .02% l OUTLET TUBE AMOUNT 616 multi-freq. Past 7th Support 18.18% 7 multi-freq. Past 6th Support .21 % l STEAM GENERATOR TUBING l S/G No. 12 Westinghouse '1102 68-25 l l INLET TUBE EXAMINATION EXAMINATION EXAMINATION l AMOUNT FREQUENCY EXTENT PERCENTAGE 176 multi-freq. Tight Radius 5.19% U-Bends 140 multi-freq. Around U-Bends 4.13% 7 multi-freq. Past 7th Support .21% 163 multi-freq. Past 1st Support 4.81% OUTLET t AMOUNT 6 multi-freq. Past 6th Support .18% 617 multi-freq. Past 7th Support 18.21% E I ISI-1019, Rev. O Page 1 of 2

l l \\ FORM NIS-1 (back) 8.) Examination Dates 7/5 to 7/18/80 9.) Inspe : tion Int erval 12/16/73 to 12/16/83 10.) Abstract of Examinations. Include a list of examinations and a statement concerning status of work required for current interval. This was the seventh inservice inspection conducted on steam generator tubes since the date of commercial operation. During this outage 937 tubes were inspected for defects on Steam Generator No. 11; and, 1109 tubes were inspected for defects on Steam Generator No. 12. The examinations completed the Eddy Current Examination requirements in accordance with Prairie Island Technical Specification, Section T.S. 4.12. 11.) Aostract of Conditions Noted. A visual examination revealed one leaking tube (Pm 2 Column 21) on the inlet side of Steam Generator No. 12. Eddy Current Examinations revealed Row 35 Column 78 tube had an indication of 34% reduction in wall t':ickness; Row 22 Column 86 tube had an indication of 35% reduction in wall thickness in Steam Generator No. 11, and Row 28 Columns 4 had a possible indication of(20% reduction in Steam Generator No. 12. Visual and Eddy Current Examinations revealed no other tubes with degradation. 12.) Abstract of Corrective Measures Recommended and Taken. A total of 1 tube was plugged during this outage, the leaking-tube (R2C21), in Steam Generator No. 12. 'de certify that the statements made in this report are correct and the examinations and corrective measures taken conform to the rules of the ASME Code, Section XI. Date b, tit // 19 A6 SignedAIsrmsyu.fre m d ur By u m._ ~C/ ~ " Owner ~ // ~ Certificate of Authorization No. (if applicable) Expiration Date ~ ~~ CERTIFICATE OF INSERVICE INSPECTION I, the undersigned, holding a valid commission issued by the National Board of Boiler i and Pressure Vessel Inspectors and/or the Stace or Province of Alw.esofa, and employed by & a74./ 9e a, N /e, h W., of h y r. / Ct. have inspected the com-ponents described in this Owner's Data Report during the period 7-f-#O to A/P cPO, and state that to the best of my knowledge and belief, the Owner has performed examinations and taken corrective measures described in this Owners' Data Report in accordance with the requirements of the ASME Code, Section XI. By signing this certificate neither the Inspector nor his employer makes any warranty. expressed or implied, concerning the examinations and corrective measures described in this Owners' Data Report. Furthermore, neither the Inspector nor his employer shall be liable in any manner for any personal injury or property damage or loss of any kind arising from or connected with this inspection. Da te AveM //, / 19 D Commissions 8/8 df e9f/7 iGy.f Z// jfisoect'oFs Signature National Board. State, Province & No. ISI-1020, Rev. O Page 2 of 2 ..}}

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