ML20084M468

Insp Program Summary

ML20084M468
Person / Time
Site:	Vermont Yankee
Issue date:	05/26/1983
From:	NUCLEAR ENERGY SERVICES, INC.
To:
Shared Package
ML19268B543	List: ML20084M458 ML20084M468 ML20084M483
References
PROC-830526, NUDOCS 8306020178
Download: ML20084M468 (6)

Text

ENCLOSURE 1 INSPECTION PROGRAM

SUMMARY

NUCLEAR ENERGY SERVICES, INC.

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ENCLOSURE 1

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1. ABSTRACT This report documents the_ personnel training, examination activities and results of the Vermont Yankee Feedwater Nozzle Inner Radius examinations performed on March 11 and March 12, 1983. Documented herein are all related support operations, applicable personnel and equipment certifications, the examination procedure with all field changes, and all final data.

2. REFERENCE DOCUMENTS

1. ASME Boiler and Pressure Vessel Code,Section XI,1974 Edition, Summer 1975 Addenda, invoking the provisions of IWA-2240.

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2. ASME Boiler and Pressure Vessel Code,Section V.1974 Edition, Suminer 1975

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3. NUREG-0619; BWR Feedwater Nozzle and Control. Rod Drivi Return L.me Nozzle Cracking. .

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4. NES Document 80A9021; NES ISI Operations QA Manual (latest revision).

5. NES Document 80A7616; Ultrasonid Examination Procedure for Reactor Vessel Feedwater Nozzle Inner Radius for Vermont Yankee Rev.1.

6. NES Drawing 80C7617; Feedwater Nozzle Inner Radius Calibration Block VY IR.

7. NES Drawing 80C7618; Feedwatec Nozzle Inner Radius Examination Wedge CW.

8. NES Drawing 80C7619; Feedwater Nozzle Inner Radius Examination Wedge  ;

CCW.

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9. NES Drawing 80E7620; Feedivater Nozzle As Built.

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10. NES Drawing 80E7621; Feedwater Nozzle Barrel Plot.

11. NES Drawing 80E7622; Feedwater Nozzle Shell Plot.

3. INTRODUCTION

,- Nuclear Energy Services was contracted by Yankee Atomic Electric Company to perform an outside diameter ultrasonic examination of the Vermont Yankee Reactor Pressure Vessel Feedwater Nozzle Inner Radius, and a demonstration of the NES te'chnique to the Nuclear Regulatory Commission on the Nine Mile Point Feedwater Nonte

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' Mock Up. In addition, NES also provided examination support in the form of the design and, fabrication' of calibration standards, inner radius examination wedges and the generation of an exirnination procedure. This preparation resulted in the f

,.! f successful examination of the four (4) feedwater nozzle inner radius areas including an

~ evaluttion and disp 6xition of all recordable indications.

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, 4. TEXT NES examinatic.$ of the nozzle inner radius sntailed the execution of several tasks which composed the defined workscope.

Review, Design and Fabrication.

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NES reviewed the as built ' nozzle contiguration and generated a drawing, 80E7620, Vermont Yankee Feedwater No?. li As Built.

l This drawing was'ut,ed iri tiie development of sound path plots for both the shell and the nonle barrel area.~ NES [Drawini 80E7622, Vermont Yankee Feedwater Nozzle Shell Plot, and NES drawing 80E7621, Vermont Yankee Feedwater Nozzle Barrel Plot l

were prepared to aid in the determination of scan paths, design of ultrasonic wedges

( and for use in training of permnnel. ' '

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Exirnination wedges were designed and fabricated to provide a nominal 450 angle for the' nozzle barrel Wamination. Two designs were utilized: NES orawing 80C7618, Vermont Yankee Feedvat-r Nozzie Inner Radius Examination Wedge CW (CIockwise Scan); and NES drawing SOC 7619, Vermont Yankee Feedwater Nozzle Inner Radius Examination Wedge CCW (Counter-Clockwise Scan). Three wedges of each design were fabricated. '

Simultaneously NES designed and fabricated calibration block VY-6-IR; Vermont Yankee Feedwater Nozzle Inner Radius Calibration Block, NES Drawing 80C7617.

This calibration block was designed for use in all calibrations performed from'the nozzJe barrel.

The final item for the support task was the preparation of an independent examination '

procedure ircorporating equipment, technique, personnel respon'sibilities and code

, requirements. 'NES document 80A7616; Ultrasonic Examination Procedure for Reactor Vessel Feedwater Nozzle Inner Radius for Vermont Yankee incorporates the 'above

( requir'ements and delineates the examination process from calibration to evaluation.

NRC Oemonstration

,s s The. inner radius examination technique was demonstrated to the appropriate NRC

personnel on February 3 and 4,1983. This successful demonstration took place at Nine Mile Point utilizin; their feedwater nozzle mock up. Qualification and examination

( hpproval was hbtained from the NRC prior to the actual exam performance at the Vermont facility.<

t in additior; to the NRC demonstration, the Nine Mile Point mock up was also used in

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the training of examination personnel satisfying procedural requirements.

s Examination Ultrasonic examinations were performed during the week of March 7,1983. All exams were in accordance with NES document 80A7614; Ultrasonic Examination Procedure k

for Reactor Vessel Feedwater Nozzle Inner Radius for Vermont Yankee Rev. 1.

Examinations were performed from both the shel! side and the nozzle barrel side.

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Shell exams were accomplished by calibrating on Vermont vessel block "RV3" utilizing a 700 angle beam shear wave technique. Nozzle barrel exams were accomplished by calibrating on calibration block VY-6-IR utilizing a 450 angle beam shear wave.

Examinations were performed in both examination zones of all four nozzles with the following results:

Nozzle # ZoneI Zone II N4 A complete limited scan thermocouple tubes N4 B limited scan limited scan thermocouple tubes thermocouple tubes N4 C limited scan limited scan l thermocouple tubes thermocouple tubes Level 111 evaluation Recorded for baseline data Disposition: Acceptable N4D complete limited scan thermocouple tubes Level III evaluation 1,2,6:4 Recorded for baseline data 3 non-relevant indication Disposition: Acceptable Refer to Data Packages in Appendices for further information.

. Conclusion NES found all feedwater nozzle inner radius areas examined to be free of relevant indications.

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