ML20032C605
| ML20032C605 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 10/30/1981 |
| From: | Mills L TENNESSEE VALLEY AUTHORITY |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, NUDOCS 8111100637 | |
| Download: ML20032C605 (2) | |
Text
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TENNESSEE VALLEY AUTHORITY USNRC REGJgN L A NTA, O c;,n c i,,
CH ATTANOOG A. TEN N ESS2E 37401 400 Chestnut Street Tower II 8m3 A8 M
October 30, 1981
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Mr. James P. O'Reilly, Director Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission k,
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Region II - Suite 3100 101 Marietta Street q,,
Atlanta, Georgia 30303
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Dear Mr. O'Reilly:
BELLEFONTE NUCLEAR PLANT UNIT 2 - GOUGES IN PRESSURIZER VESSEL -
BLRD-50-439/81 SECOND INTERIM REPORT The subject deficiency was initially reported to NRC-0IE Inspector R. V. Crlenjak on July 14, 1981 in accordance with 10 CFR 50.55(e) as NCR 1522. This was followed by our first interim report dated August 13, 1981. Enclosed is our second interim report. We expect to submit our next report by February 18, 1982.
If you have any questions concerning this matter, please get in touch with R. H. Shell at FTS 858-2688.
Very truly yours, TENNESSEE VALLEY AUTHORITY l
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y p. M. Mill, Manager T
Nuclear Regulation and %y are Enclosure cc:
Mr. Victor Stello, Jr., Director (Enclosure)
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Office of Inspection and Enforcement U.S. Nuclear Regulatory Comm'.ssion Washington, DC 20555 3
Mr. James McFarland (Enclosure)
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l Senior Project Manager Babcock & Wilcox Company P.O. Box 1260 Lynchburg, Virginia 24505 YDRh$afK0500o439 3l 81>030 S
PDR nn Equal Opportunity Employer
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ENCLOSURE BELLEFONTE NUCLEAR PLANT UNIT 2 GOUGES IN PRESSURIZER VESSEL BLRD-50-439/81-48 10 CFR 50.55(e)
SECOND INTERIM REPORT Description of Deficiency During an inspection, it was noticed that there were several gouges, approximately 1/16" to 3/16" deep and 1/2" to 1-1/2" long, on the pressurizer vessel. Until the site evaluation is complete, it will not be known if these gougt-violate the minimum wall thickness of the vessel.
TVA's Division of Construction (CONST) made these gouges when a grinder came in contact with the pressurizer vessel wall during the grinding of shear bar welds.
Similar deficiencies which have occurred at the site include:
Two reactor coolant pump cases (one p[r unit) which were accidently 1.
gouged, but minimum wall thickness was not violated (NCR's 1442 and 1465).
2.
Arc strikes on the elbow conn'ecting the 32-inch cold leg pipe to the steam generator outlet nozzle, which were repaired by buffing (NCR 1212).
3 Arc strikes on the head of a decay heat resoval system cooler. TVA is in the process of obtaining corrective acc. ion from B&W (NCR 1538).
None of these similar deficiencies were determined to be reportable.
Interim Progress The affected areas are to be repaired by grinding the indications and blendin; them with the vessel surface. The minimum base metal thickness will then be verified by aubjecting the ground area to an ultrasonic examina tion. Based on preliminary wall thickness measurements, the as-ground wall thickness will not violate the minimum wall thickness.
To prevent recurrerne of this type deficiency, construction employees have been instructed to exercise greater caution when grinding welds in order not to damage plant cauipment by allowing contact with the grinder.
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