ML20069B498

Significant Deficiency Rept 413/81-28 Re Westinghouse Radiographic Film for Reactor Vessel CRDM Housing Welds. Radiographic Technique Sufficiently Sensitive to Detect Rejectable Flaws.Westinghouse 811204 & 25 Ltrs W/Rept Encl

ML20069B498
Person / Time
Site:	Catawba
Issue date:	12/08/1981
From:	Parker W DUKE POWER CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20069B503	List: ML20069B498 ML20069B523 ML20069B534
References
10CFR-050.55E, 10CFR-50.55E, NUDOCS 8112240238
Download: ML20069B498 (3)

Text

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400 SotTTri Cut:xcn STnEzr, CllARIDTTE, N. C. T.:5340 3 } O f C iki Sb*h WILLI AM O. PA R M E R, J R.

VSCt PettaCENT I(6 f Pwo,.t:Anta 7c4 Sv taas PeoowcT'ose 3 7 3-4ct) 3 Mr. James P. O'Reilly, Director U. S. Nuclear Regulatory Commission Region II 101 Marietta Street, Suite 3100 Atlanta, Georgia 30303 Ile: Catawba Nuclear Station Unit 1 Dccket No. 50-413

Dear Mr. O'Reilly:

Pursuant to 10 CFR 50.55e, please find attached Significant Deficiency Report SD 413/81-28.

Very truly yours, f(,, 17td CUU Ah p William O. Parker, Jr. c.f

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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 Washie ', ton . 3. C. 20555 Columbia, South Carolina 29201 Rcnident Inspector-NRC Palmetto Alliance Cacawba Nuclear Station 2135 Devine Street Columbia, South Carolina 29205 tghs 3 ,

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CATAWBA NUCLEAR STATION Report Number: SD 413/81-28 Report Date: December 8, 1981 Facility: Catawba Nuclear Station Unit 1 Identification of Deficiency:

Radiographic film for reactor vessel CRDM housing welds supplied by Westinghouse does not meet the requirements of ASME Section 111, Appendix IX. (CA-81-19)

Description of Def_i_ciency:

On June 3, 1981, Messrs. W. O. Henry, J. K. Berry, and J. E. Cavender advised Mr. J. Bryant of NRC, Region II, of this deficiency.

On June 24, 1981, Westinghouse determined that thirteen (13) RT films at Catawba exceaded 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.

1 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 for these welds even though all the essen-tial parameters of radiography may not have been met.

In addition, Westinghouse performed a fracture mechanics evaluation of the welds which indicates that a very large flaw would be necessary to cause f ailure of the weld. (A copy of the Westinghouse report is attached.)

Therefore, we conclude that these welds would not have failed.

Corrective Action:

These radiographs were produced approximately 8 to 10 years ago. We do not anticipate receiving any other radiographs produced by this 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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