ML20077H319
| ML20077H319 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 07/15/1983 |
| From: | Kammer D TENNESSEE VALLEY AUTHORITY |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| Shared Package | |
| ML20077H311 | List: |
| References | |
| NUDOCS 8308090753 | |
| Download: ML20077H319 (3) | |
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TENNESSEkE VALLEY AgkJp;iARIT,Y3 TON I CH ATTANOOGA. TENNESSNb7401 '
400 Chestnut Street Tower II i
83 JUL 19 A10 : 4 5 July 15, 1983 U.S. Nuclear Regulatory Commission Region II ATTN: James P. O'Reilly, Regional Administrator 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30303
Dear Mr. O'Reilly:
Enclosed is our response to R. C. Lewis' June 16, 1983 letter to H. G. Parris transmitting Inspection Report Nos. 50-259/83-16,
-260/83-16, -296/83-16 regarding activities at our Browns Ferry Nuclear Plant which appeared to have been in violation of NRC regulations. We have enclosed our response to Appendix A, Notice of Violation. If you have any questions, please call Jim Domer at FTS 858-2725.
To the best of my knowledge, I declare the statements contained herein are complete and true.
Very truly yours, TENNESSEE VALLEY AUTHORITY DS W D. S. Kammer Nuclear Engineer Enclosure 8308090753 830725' PDR ADOCK 05000259 G
PDR' An Equal Opportunity Employer
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s RESPONSE - NRC INSPECTION REPORT NOS.
50-259/83-16, 50-260/83-16, AMD 50-296/83-16 R. C. LEWIS' LETTER TO H. G. PARRIS DATED JUNE 16, 1983 259/83-16-01 10 CFR 50, Appendix B, Criteria IX requires that, " measures shall be established to ensure that special processes, including... Nonde-structive testing and controlled and accomplished by qualified personnel using qualified procedures in accordance with applicable codes, standards, specifications, criteria and other special require-ments."
TVA's Ultrasonic Inspection Procedure N-UT-25, Revision 0, Paragraph 9.4 requires that, ultrasonic scanning shall be performed at two times the primary (calibration) reference level (2X) unless other variables beyond the control of the operator preclude meaningful examination at this sensitivity.
joint No. KR-1-37 at the calibration reference level. Contrary to th had been accomplished at calibration reference level.TVA's ultra A review of inspection of weld KR-1-37, by the NRC inspector, determined that no Subsequent examination variable existed, that could not have been controlled by the ultrasonic operator, to preclude TVA from obtaining a more l
meaningful examination at two times the calibration reference level i
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This is a Severity Level IV Vio'lation (Supplement 1.E).
1 1.
_ Admission or Denial of the Alleged Violation TVA admits the violation occurred as stated.
2.
Reasons for the Violation if Admitted
-'~2.
The TVA procedure was originally written to use a two node transfer technique which results in a high reference level gain setting.
In addition, the procedure states, " Scanning shall be performed at two times primary reference level (2X) unlese other variables beyond the control of the operator, e.g., inherent material noise levels, preclude meaningful examination at this sensitivity."
Therefore, when field application resulted in standing noise level which interfered with interpretation, the TVA Level III NDE examiner reduced the scanning sensitivity level
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3 Corrective Steps Which Have Been Taken and the Results Achieved The procedure was changed to provide a single node transfer technique when performing half node examinations. This change reduces the primary reference level and allows scanning at two times this lower gain setting without producing standing noise levels which interfere with interpretation. This change was implemented on May 12, 1983.
4.
Corrective Steps Which Will be Taken to Avoid Further Violations Inspection personnel have been instructed that the qualification of this procedure requires scanning at gain setting at least 6 db higher than reference level when performing examinations for detection of intergranular stress corrosion cracking.
5.
Date When Full Compliance Will be Achieved Full compliance was achieved on May 12, 1983.
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