ML20033D088
| ML20033D088 | |
| Person / Time | |
|---|---|
| Site: | Prairie Island  |
| Issue date: | 10/29/1981 |
| From: | Dahlman L, Hansen D, Kaumpas P NORTHERN STATES POWER CO. |
| To: | |
| Shared Package | |
| ML20033D084 | List: |
| References | |
| NUDOCS 8112070210 | |
| Download: ML20033D088 (16) | |
Text
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NORTHERN STATES POWER COMPANY INSERVICE INSPECTION - EXAMINATION
SUMMARY
FOR THE PRAIRIE ISLAND NUCLEAR GENERATING PLANT - UNIT II o
SEPT. 6 TO SEPT. 9, 1981 INSPECTION PERIOD 3 STEAM GENERATOR TUBE - EDDY CURRENT EXAMINATION t
COMMERCIAL SERVICE Prepared by:
D. B. Hansen, Asst.
DATE:
12-21-74 M & SP Engineer Lanny Dahlman, M & SP Specialist REPORT DATE:
Reviewed by:
p 10-29-81 P. J. Kf4;rhos, Sup t'.
Material and Special Processes Approved by:
2 2n_
RG(y W. An'derson neral Superintendent Prod. Plant Maintenance a
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NORTHERN STATES POWER COMPANY l
PRAIRIE ISLAND NUCLEAR GENERATING PLANT UNIT II
-INDEX-1.0 Introduction 2.0 Discussion of Results 3.0 Examination Plan 4.0 Examination Method 5.0 Equipment and Materials 6.0 Personnel Appendix A - Steam Generator No. 22 Eddy Current Examination Results and Tube Sheet Maps Appendix B -
Table I - Personnel Table II - Procedure Listing Table III - Equipment and Materials Appendix C - Form NIS-1, Owners' Data Report for Inservice Inspection
INSERVICE INSPECTION EXAMINATION
SUMMARY
FOR THE PRAIRIE ISLAND NUCLEAR GENERATING PLANT UNIT II Sept. 6 to Sept. 9, 1981 1.0 Introductior o
This report is a summary of the steam generator tube eddy current examinations performed on the inlet side of steam generator No. 22, at Prairie Island Unit II.
The examinations were performed during the period of Sept. 6 through Sept. 9, 1981, after a tube leak developed on August 19, 1981.
Prairie Island Unit II began commer-cial operation on December 21, 1974.
2.0 Discussion of Results The results of the visual examination of the tube sheet array in the hot leg side of the generator, while the secondary side was filled with water and under pressure, indicated that tube R36 C35 was leaking.
No leaks were noted in the cold leg side and it was revealed that R36 C35 was plugged. A review of the eddy current results and plugging maps, from the previous outage, revealed that in the hot leg side R36 C35 was not plugged, but R37 C36 had been plugged by mistake.
Mechanical plugs were installed in the opposing ends of R36 C35 (hot leg) and R37 C36 (cold leg) to correct the leaking tube and ensure tnat proper correlation between hot leg and cold leg plugs was established.
Eddy current examinations were conducted on the leaking and the seven surrounding tubes with the following results:
Row Colm.
Sept. 1981 Extent Previous Location Indications Indications 35 34 None U-Bend None r4/A 36 34 None U-Bend N/A N/A 37 34 None Full length N/A N/A 35 35 None U-Bend N/A N/A 36 35 100%
U-Bend
- 1 AVB 78%
0 #1 AVB 99%
- 2 AVB 80%
0 #2 AVB 99%
- 3 AVB 73%
0 #3 AVB 80%
- 4 AVB 420%
0 #4 AVB 37 35 None U-Bend None N/A 35 36 None U-Bend N/A N/A 36 36 None U-Bend N/A N/A The steam generator tube sheet map is shown in Appendix A.
3.0 Examination Plan The inspection program was conducted to verify the leaking tube location, and focused on tubes adjacent to the leaking tube for any signs of degradations that may have occurred due to the leaking tube.
4.0 Examination Method Westinghouse, along with technical support from Zetec Corporation, was contracted to perform and evaluate the data from eddy current ex'amina tions.
The examinations were performed using Westinghouse's multi-frequency eddy current testing system. A differential coil multi-frequency is used for the inspection to detect localized
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degradation and to measure the extent of wastage, if any, occur-ring on the outside diameter of the tube turface. By employing four imposed frequencies, 400 KHZ (tube wall degradation),100 KHZ absolute (tight radius U-bends), on the probe during examina-tion, information. over and above minimum requirements were ac-quired 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 B.
6.0 Personrel Northern States Power Company contracted Westinghouse, with technical eddy current examination support from Zetec Corporation, to perform and evaluate the eddy current examinations.
Hartford Steam Boiler Insurance and Inspection Company, representing ANI, provided the Authorized Inspection.
All personnel involved in the performance or evaluation of exam-inations are listed, along with their title, organization and ASNT level of certification, in Table I of Appendix B.
Certifications for examination personnel are maintained on file by Northern States Power Company.
0
t APPENDIX A o
STEAM GENERATOR NO. 22 EDDY CURRENT EXAMINATION RESULTS AND TUBE SHEET MAPS l
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SERIES SI 93 9189 67 % 83 ol Y) 77 75 73 76 L,9 l,,7 65 45 bl 59 5155 E3 SI 49 4145 43 4/ 39 3735 33 3/ 29 2125 23 21 17171513 ll 9753/
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- s-MANWAY Prairie Island Nuclear Generating Plant Unit II NOZZLE Steam Generator No. 22 " Inlet" Multifrequency Examinations:
O U-Bend A Full length Appendix A
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APPENDIX B o
TABLE I PERSONNEL TABLE II PROCEDURE LISTING TABLE III EQUIPMENT AND MATERIALS i
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PRAIRIE ISLAND UNTT II TABLE I
PERSONNEL LISTING PAGE 1 0F 1 ASNT LEVEL EXAMINER TITLE ORGANIZATION ET II)
HAZEN, R.P.
TECHNICIAN W
LEVEL II MILLS, J.E.
TECHNICIAN W
LEVEL I FRANCIS, D.R.
TECHNICIAN W
LEVEL I TESTA, G.F.
TECHNICIAN W
LEVEL II NEFF, A.S.
EVALUATOR ZETEC( }
LEVEL II A DAHLMAN, L.C.
M&SP SPEC.
NSP HANSEN, D.B.
ASSOCIATE NSP M&SP ENGINEER WILLIAMS, J.
ANII HARTFORD STEAM B0ILER INSPECTION &
INSURANCE C0.
I FOOTNOTES:
(1) ORGANIZATION:
(1) WESTINGHOUSE ELECTRIC CORPORATION Nuclear Services Division P.O. Box 2728 Pittsburgh, PA 15230 (2) ZETEC d
P.O. Box 140 Issaquah, WA 98027
NORTilERN STATES POWER COMPANY APPr.NDIX B
PRAIRIE ISLAND UNIT II TABLE II PROCEDURE LISTING PAGE 1 0F 1 PROCEDURE NUMBER FIELD PLANT APPROVAL FIELD CilANGE AND REVISION CllANCE PROCEDURE TITLE DATE REMARKg Cl!ANGE DESCRIPTION MRS 2.4.2. GEN-23, NONE MULTI-FREQUENCY 7-3-80 NONE REVISION 2 EDDY CURRENT INSPECTION OF STEAM GENERATOR TUBING -
PRESERVICE AND INSERVICE
NORTHERN STATES POWER COMPANY APPENDIX B
PRAIRIE ISLAND - UNIT 2 TABLE IIV EQUIPMENT AND MATERIALS PAGE,
1 0F 2
'ALIBRATION DATE REMARKS EQUIPMENT SERIAL NUMBER OR BATCH NUMBEF BRUSH RECORDER S/N 0059 9-04-81 0701 6-17-81 0156 8-12-81 0024 8-12-81 0276 7-02-81 0037 6-17-81 TAPE RECORDER S/N 0545 6-29-81 HP 3968AZ 0647 6-29-81 0546 7-06-81 1041 7-07-81 1022 7-21-81 MIZ 12 MAIN FRAME S/N 0690 6-30-81 0661 6-29-81 0570 6-26-81 FREQ. PLUG-IN S/N 0596 6-30-81 0561 6-26-81 0670 6-29-81 0565 6-30-81 0695 7-27-81 0575 6-26-81 0558 6-30-81 0577 6-29-81 0711 6-26-81 0568 6-30-81 0549 6-29-81 0541 7-28-81 MIZ 12 MIXER PLUG-S/h 0641 6-30-81 IN 0598 6-26-81 0562 6-30-81 0710 6-30-81 0673 6-30-81 0554 6-26-81 MIZ 12 DISPLAY S/N 0573 6-30-81 MODULE 0643 6-05-81 TEK SIII STORAGE S/N 1056 7-27-81 SCOPE 0572 6-30-81 0266 6-05-81 VECTOR ANALYZER S/N 023 7-15-81 MIXER MODULE S/N 162 7-27-81 163 7-27-81
l NORTHERN STATES POWER COMPANY APPENDIX 8
PRAIRIE ISLAND - UNIT 2 TABLE III j
EQUIPMENT AND MATERIALS PAGE 2
0F 2
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l TYPE OR CALIBRATION DATIi REMARKS MATERIAL OR l
EQUIPMENT SERIAL NUMBER OR BATCH NUMBER CALIBRATION STANDARDS ICONEL 600 I-32-W IN-LINE STD ICONEL 600' NX-7735 ABSOLUTE STD
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APPENDIX C FORM NIS-1, OWNERS' DATA REPORT FOR INSERVICE INSPECTION PAGE 1 of 1
FORM NIS-1 OWNERS' DATA REPORT FOR INSERVICZ INSPECTIONS (As Required by the Provisions of the ASME Code Rules) 1.)
Owner Northern States Power Company Address 414 Nicollet Mall. Minneaonlis. Minnosnta 2.)
Piant Prairie Island Nuclear Generating Plant, Unit 2 l
Address Welch, Minnesot3 3.)
Plant Unit 2
4.)
Owner (Certificate of Authorization) 5.)
Commercial Service Date 12-21-74 6.)
National Board Number for Unit --
7.)
Components Inspected Ma nu f a c turer Component or Manu fac turer or Installer State or National Appurtenance or Installer Serial No.
Province No.
BcArd No.
82.11 Steam Generator tubing Steam Generator i
No. 21 Westi nghouse 1182 68-40 Inlet tube Insp.
Insp.
Amount _
Type Extent 6
Mul ti-f req.
Around U-Bend 1
Mul ti-f req.
Full length i
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l ISI-1019, Rev. O Page 1 of 2
FORM NIS-1 (back) 8.)
Examination Dates 9-6-81 to 9-9-81 9.)
Inspe.: tion Int erval 12-21-74 o 12-21-84 t
10.)
Abstract of Examirations.
Include a list of examinations and a statement concerning status of work required for current interval.
This was the sixth inservice inspection conduced on steam generator tubes since the date of commercial operation.
During this outage 8 tubes were examined for defects in steam generator No. 22.
11.) Abstract of Conditions Noted.
The results of eddy current examinations revealed that the leaking tube was the result of a mispla:ed plug.
The plug was installed in R37C36 in lieu of R36C35.
12.) Abstract of Corrective Measures Recommended and Taken.
A total.of 2 tubes were mechanically plugged this outage; R36C35 on the inlet
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side and R37C36 on the o tiet side of steam generator No. 22 is We 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.
Da te /O - 29 19 P/
Signed klocenM $wreshows O. By /7 1/- -
Owner Certifi'cate of Authorization No. (if applicable)
Expiration Date
(
l CERTIFICATE OF INSERVICE INSPECTION l
I, the undersigned, holding a valid commission issued by the National Board of Boiler j
and Pressure Vessel Inspectors and/or the Sta ce or Province o f
.'P?.<<6 e /s and employed i
l by N fB I + T 6 of N a s W./ c r-have inspected the com-l ponents described in this Owner's Data Report during the period 9-/ 8/
to 7-f cP/
l and state that to the best of my knowledge and belief, the Owner har, performed examinations and taken corrective measures described in this owners' Data Report in accordance with i
the requirements of the ASME Code,Section XI.
l ly signing this certificate neither the Inspector nor his employer makes any warranty, l
expressed or implied, concerning the examinations and corrective recsures described in this Owners' Data Report.
Furthermore, neither the Inspector nor his employer shall I
be liable in any manner for any personal injury or property damage or loss of any kind arising from or connected with this inspection.
y Date ln - 2sf El, /
19
_N
/ Mt Commissions A//7 Nd 7
- v 22/
/Inicettor's Signature National Board, State, Province & No.
ISI-1020, Rev. O Page 2 of 2
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