ML20058G177
| ML20058G177 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 07/19/1982 |
| From: | Mills L TENNESSEE VALLEY AUTHORITY |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| Shared Package | |
| ML20058G169 | List: |
| References | |
| NUDOCS 8208030225 | |
| Download: ML20058G177 (3) | |
Text
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- 3 July 19, 1982 U.S. Nuclear Regulatory Cormnission Region II Attn:
Mr. James P. O'Reilly, Regional Administrator 101 Marietta Street, Suite 3100 Atlanta, Georgia 30303
Dear Mr. O'Reilly:
BELLEFONTE NUCLEAR PLANT UNIT 1 - RESPONSE TO VIOLATION 50-438/82-16-04 CONTROL ROD DRIVE MECHANISMS NUT RING RETAINER BOLTS This is in response to F. J. Long's letter dated June 16, 1982 report numbers 50-438/82-16, 50-439/82-16, concerning activities at the~ Bellefonte Nuclear Plant which appeared to have been in violation of NRC regulations. Enclosed is our response to the citation. If you have any questions concerning this matter, please get in touch with R. H. Shell at FTS 858-2688. To the best of my knowledge, I declare the statements contained herein-are complete and true. Very truly yours, TENNESSEE VALLEY AUTHORITY W L. M. Mills, Manager Nuclear Licensing Enclosure cc: Mr. Richard C. DeYoung, Director (Enclosure) Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, DC 20555 8208030225 820728 PDR ADOCK 05000438 O PDR An Equal Opportunity Employer
ENCLOSURE BELLEFON1E NUCLEAR PLANT UNIT 1 RESPONSE 10 SEVERITY LEVEL IV VIOLATION 50-438/82-16-04 CON 1ROL ROD DRIVE MECHANISMS NUT RING RETAINER BOLTS Description of Deficiency 10 CFR 50, Appendix B, Criterion V, and Tennesse Valley Authority (TVA) Final Safety Analysis Report, Section 17.1A.5, requires that activities affecting quality be accomplished in accordance with procedures and drawings. 'Bellefonte's sequence control chart SCC INR-M-004R1 paragraph 31 states: Torque nut ring retainer bolts to five f t-lbs.' Contrary to the above, on May 27,1982, the resident inspector identified two (2) nut ring retainer bolts that were loose on control rod drive mechanisms CRDM #1209 and //1215. These nuts had previously been inspected by QC personnel. Admission or Denial of the Alleged Violation TVA admits the violation occurred as stated. Reason for the Violation While admitting a violation occurred in that initially two and, upon investigation, four nut ring retainer bolts were discovered not torqued to the specified torque value, TVA does not want to inf er that we deviated from the process control documents. The deviation occurred because an operation (specifically the locking tab crimping) subsequent to the bolt torquing operation slightly loosened the nuts and relaxed the torque on the four nut ring retainer bolts. Before the finding of the resident inspector, TVA realized problems existed in the crimping operation, and measures were taken to improve the crimping method. TVA should have inve stigated all bolts torqued and locked before initiation of the revised crimping method. Bow ev e r, TVA did not recognize that the crimping process would result in loosened nuts. Nut ring retainer bolts crimped using the j revised method were determine'd to be acceptable during the investigation initiated by the finding. Corrective Action Taken and Results Achieved l As stated in the resident inspector's report, QCIR 20991 was generated to i reinspect all previously installed nut ring retainer bolts for tightness. The four nut ring retainer bolts identified as loose were retorqued, crimped utilizing the modified crimping method, inspected, and documented per applicable procedures SCC INR-M-004 and 1NR-M-004 RI. QCIR 20991 was closed on May 28, 1982. l ]
Staps Taken To Avoid Further Violetions Personnel involved in the torquing and crimping operations were made aware of the necessity to ensure that performance of crimping did not loosen the bolts. All nut ring retainer bolts in unit I have been installed and crimping completed successfully. Because of the unique characteristics of this crimping operation, recurrence control will only apply to similar bolts in the unit 2 control rod drive mechanisms, which will be properly checked for tightness upon completion of crimping operations. Date of Full Compliance 1YA was in full compliance on May 28, 1982. L- ]}}