ML20069B452

Final Deficiency Rept SD-413/81-12 Re Radiographic Film for Reactor Vessel Control Rod Drive Mechanism Housing Welds Exceeding Film Density Requirements.Rept Inadvertently Submitted on 811208 as Deficiency Rept SD-413/81-28

ML20069B452
Person / Time
Site:	Catawba
Issue date:	12/15/1981
From:	Parker W DUKE POWER CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
10CFR-050.55E, 10CFR-50.55E, SD-413-81-12, NUDOCS 8112240221
Download: ML20069B452 (4)

Text

{{#Wiki_filter:i 4 -s, Dunn Po3WiU[C$~ihANY-I'owru Iluttuiso 4= Socru Cucacu Srnrer, CHAH14 TIE, N. Gam ,+ 3e { [ C ? \\ ', WI LLI AM O. PA R K E R. J R. V< r Pets CE wY ?t E **CMr: ASEA 7Ce set - P.oxcwo* December 15, 1981 imen d_ JY Mr. James P. O'Reilly, Director / f U. S. Nuclear Regulatory Commission hf: Ceil'C;; Region II p' DEC 231981> 7: 101 Marietta Street, Suite 3100 v' Atlanta, Georgia 30303 4 :: ~ a, L y . / 2'c,[; y., 3'Q' Re: Catawba Nuclear Station Unit 1 7 ocket No. 50-413 / h, /'N' \\ n

Dear Mr. O'Reilly:

Pureuant to 10 CFR 50.53e, please find attached the final response to Sig-nificant Deficiency Report SD-413/81-12. This report was previously submitted on December 8, 1981, inadvertently, as Significant Deficiency Report SD-413/ 81-28. Please disregard the December 8, 1981 submittal. A corrected Sig-nificant Deficiency Report SD-413/81-28 will be submitted by December 17, 1981. Verv truly yours, ? y Willian 0. Parker, Jr RWO/php Attachment cc: Director Mr. Robert Guild, Esq. Office of Inspection and Enforcement Attorney-at-Law U. S. Nuclear Regulatory Commission 314 Pall Mall Washington, D. C. 20555 Columbia, South Carolina 29201 NRC Resident Inspector Palmetto Alliance Catawba Nuclear Station 2135'3 Devine Street Columbia, South Carolina 29205 s n', n 1M. ;N5h hUZ4022gf00 sir DR 3 ADOCM O 215 _ll 27 l1r

DUKE POWER COMPANY CATAWBA NUCLEAR STATION Report Number: SD-413/81-12 Report Date: December 15, 1981 Facility: Catawba Nuclear Station Unit 1 Identification of Deficiency: Radiographic film for reactor vessel CRUM housing welds supplied by Westinghouse does not meet the requirements of ASME Section III, Appendix IX. (CA-81-19) Description of Deficiency: On June 3,1981, Messrs. W. O. Henry, J. K. Berry, and J. E. Cavender advised Mr. J. Bryant oi NRC, Region II, of this deficiency. On June 24, 1981, Westinghouse determined that thirteen (13) RT films at Catawba exceeded the film density requirement. Evaluation of Deficiency: Westinghouse fabricated a mock-up of the CRDM housing welds and radiographed the mock-up using the same RT technique that was used originally. Artificial discontinuities were introduced in the mock-up which consisted of a 1/32 inch (0.032 inch) groove and a 1/16 inch (0.063 inch) diameter hole. The essential features of the IQI (penetrameter) and the artificial flaws were clearly discernable in the radiographs of the mock-up. Westinghouse radiographed the thirteen (13) CRDM housing welds at Catawba. No rejectable indications were detected by this examination. Indications of porosity of approximately 1/65 inch (0.016 inch) were discern-able in some instances on some of the film. This information verified that the radiographic technique is.sufficiently sensitive to detect discontinuities which would be considered rejectable tor these welds even though all the essential parameters of radiography may not have been met. In addition, Westinghouse performed a f racture mechanics evaluation of the welds which indicates that a very large flaw would be necessary to cause failure of the weld. (A copy of the Westinghouse report is attached.) There-fore, we conclude that these welds would rot have failed. Corrective Action: These radiographs were produced approximately 8 to 10 years We do not anticipate receiving any other radiographs produced by this ago. organization (RDM). All other radiographs, which were produced by RDM were reviewed and no other discrepancies were detected. No other action is planned.

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