ML20032D375
| ML20032D375 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 11/03/1981 |
| 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 8111130713 | |
| Download: ML20032D375 (2) | |
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e 6 TENNESSEE VALLEY AUTHO, Rig CH ATTANOOG A. TENNESSEE 374oTL A NTA,.';E 0 p r;;t 400 Chestnut Street Tower II November 3,b9f N O
^0*N BLRD-50-439/81-64 I
6, Mr. James P. O'Reilly, Director
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Dear Mr. O'Reilly:
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BELLEFONTENUCLEARPLANTUNIT2-LAPINDICATIONONNAVC0SPOOLPEdBd;j\\
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BLRD-50-439/81 FINAL REPORT The subject deficiency was initially reported to NRC-0IE Inspector R. V. Crlenjak on October 8, 1981 in accordance with 10 CFR 50.55(e) as NCR 1592. Enclosed is our final report. We consider 10 CFR Part 21 applicable to this deficiency.
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 m.u 7 T.iff Y
L
. Mills, Manager Nuclear Regulation and Safety Enclosure cc:
Mr. Victor Stello, Jr., Director (Enclosure)
Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, DC 20555 l
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PDR An Equal Opportunity Employer G
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.s ENCLOSURE BELLEFONTE NUCLEAR PLANT UNIT 2 LAP INDICATION ON NAVC0 SPOOL PIECE BLRD-50-439/81-64 10 CFR 50.55(e)
FINAL REPORT Description-of Deficiency During weld preparation, TVA found an unacceptable lap-type indication in an ASME III Class 3 piping subassembly which was supplied to TVA by the National Val e and Manufacturing Company (NAVCO), Pittsburgh, Pennsylvania. The subassembly is a 6-inch, schedule 160, ASME SA 106 GR B -
pipe with mark number 2CA-28, which is part of the Auxiliary Feedwater (AFW) System. Ths lap indication depth was measured.at 3/32", which.
exceeds the depth allowed by the material specification. The measured depth is below TVA-calculated minimum wall thickness of 0.6241" by 0.0039".
The indication is therefore considered a " defect," as defined by the ASME Code.
Safety Implications
-s The subject spool piece is located on the discharge side of the motor-i driven pump on the AFW System. Should the AFW System be activated and the turbine-driven pump not be operational, a failure of this spool piece could reduce the feedwater supply. This could result in an excessive thermal transient in the steam generator which may adversely impact the Reactor Cooling System.
Corrective Action TVA has replaced the defective portion of pipe with new pipe. Lap type indications are characteristic of rolled carbon-steel pipe. TVA has idantified only two indications (one significant, one nonsignificant) of this type out of approximately 10,000 spool pieces supplied to Bellefonte by 3'.VC0 of which approximately 60 percent have been installed. - NAVC0 has been notiC'ed of this deficiency and TVA concurs with the assessment tbst this does not indicate a generic breakdown of NAVCO's QA program. Consequently, there are ro actions to prevent recurrence.
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