ML19345G751
| ML19345G751 | |
| Person / Time | |
|---|---|
| Site: | Hartsville, Phipps Bend  |
| Issue date: | 04/09/1981 |
| From: | Mills L TENNESSEE VALLEY AUTHORITY |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| REF-PT21-81-402-000 10CFR-050.55E, HTRD-50-518-81, HTRD-50-519-81, HTRD-50-520-81, HTRD-50-521-81, PBRD-50-553-81, PBRD-50-554-81, PT21-81-402-000, NUDOCS 8104220216 | |
| Download: ML19345G751 (3) | |
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PRE.IMINARY EVALUATION OF THE'A1TAQED REPORT INDICATES LEAD R FOLLOWUP AS SHMi BE.0W:
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.y TENNESSEE VALLEY AUTHORITY fl-l/0 2-0 0g cH ATTANOCGA. TENNESSEE 37401 400 Chestnut Street Tower II April 9, 1981 HTRD-50-518/81-09, -519, -520. -521/81-c8 PBRD-50-553/81-11, -554/81-06 Mr. James P. O'Reilly, Director Office of.'nspection and Enforcement U.S. Nuclear Regulatory Ccamissica Region II - Suite 3100 1r* '!arietta Street Ati ata, Georgia 30303
Dear Mr. O'Reilly:
HAES7'- !.'t AND PDPS REND NUCLEAR PLAhTS - REPCR*ASLE DEFICIENCY -
REACTOR PRESSURE VESSEL NLi AND STUD IRREOULARITIES -
HTED-50-518/81-09, -519, -520, -521/51 PRRL-50-553/31-11,
-55t /81-06 The subject deficiency was initially reported to NRC-CIE, Regien II, Inspector P. A. Taylor en March 10, 1981, as NCE S-15.
In ecepliance with parsg sph 50.55(e) ef 10 C'R Part 50, we a e enclosing the first and fir:a1 report en the subject deficiency. We consit'er 10 CFR Par c 21 applicable to this nonconformance. If you have any questions, please call Jim Decer at F"S 357-2014 Very truly yours, TENNESSEE 7ALLET AtTfBORITT L. M. Mills, Manager Nuclear Regulation and Safety Enclosure cc:
Mr. Victor Stello, Director (Enclosure)
- Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, DC 20555 An Ecu3i O:;;;r:pi$ E 7 ;0 f-
P' ENCLCSUPI HARISVILLE AND PHIP@S BEND NUCLEAR PLANTS REACTOR PRESSURE VESSEL (RPV) NITT AND STUD IRPEGULARITIES HTRD-50-518/81-09, -519, -520, -521/81-08 PBRD-50-553/81-11, -554/81-06 10CFR50.55(e) REPORT NO.1 (FINAL)
Description of the Deficiency The subject nonconforming condition identifies three individual deficiencies.
They are:
1.
Threads on seven nuts, out of 252 inspected, which were improperly machined and do not conform to standards specified in Industrial Fasteners Institute, Fasteners Standards, Fifth Edition.
2.
Failure to stamp studs with material identification as specified in the procurement document.
3 Overmachining of 11 studs, out of 126 inspected, to an undersi:ed condition.
The nuts and studs are used to hold the reactor pressure vessel to the RPV pedestal.
The particular lot of material inspected is for use at Phipps Bend Nuclear Plant (PBN) unit 2.
The material was fabricated by Acimet Manufacturing Company (Acimet), Cleveland, Ohio, under subcontract from Lakeside Bridge and Steel Ccmpany. Acimet supplied si=ilar material for the RPV bolting assemblies at Hartsville Nuclear
- .ints (HTN) A and B and PSN unit 1.
The nonconformilg condition was identified as a result of a 100-percent visual and gauge inspection conducted by TVA at the Acimet Plant. This was an expanded inspection (TVA normally performs only a random sampling inspection) which was prompted by the identification of deficient nuts at Hartsville Nuclear Plant A.
In additica, as a result of the repeated recurrence of discrepant material manufactured by Acimet to TVA (NCR HNPA-117, described to NRC-OIE as nonreportable on January 27, 1981, and NCR ENPB-032, described to NRC-0IE as nonreportable on January 27, 1981), one must cenclude that a significant breakdown of a portion of the Acimet Quality Assurance Program exists.
Safdty Implications Three individual deficiencies are identified by the NCR. Material identification will not affect safety of the plant. The improper threading on the nuts is a recurrence of a similar problem identified at HTN (NCR's HNPA-117 and HNPB-032) and determined not to affect safety of the plant. The undersized thread on the studs, from a safety standpoint, cannot be addressed due to a lack of adequate information. Therefore, during a seismic event, it is assumed that the integrity of the RPV could be compromised and this could affect the safety of the plant.
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Corrective Action The PBN unit 2 material identified by this NCR has been reworked or replaced. A 100-percent visual and gauge inspection was then performed, the material was found to be acceptable by TVA and was released for shipment to PBN unit 2.
In additien, TVA initiated inspection at HTN A and B and PBN unit 1 on all materials shipped from Acimet. The inspection at HTN was a 100-percent visual and gauge inspection of the nuts and a 90-percent visual and gauge inspection of the studs. Out of 1008 nuts inspected, 179 were rejected. No studs were rejected. The inspection at PBN unit 1 was a 100-percent visual inspection of the nuts and studs. Out of 252 nuts,12 were rejected. No studs were rejected. TVA is in the process of returning all deficient nuts to Acimet for replacement.
TVA will perform a 100-percent visual and gauge inspecticn of the replacement nuts.
Upen receipt of the replacement =aterial, all orders on this contract will be ecmpleted. TVA has no other contracts with Act;et at this time. TVA has placed a note in the Acimet file for. future crders th'at' 100-percent source inspection is required on all centract work provided by them.
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