ML20009F559
| ML20009F559 | |
| Person / Time | |
|---|---|
| Site: | Yellow Creek  |
| Issue date: | 04/22/1981 |
| From: | Mills L TENNESSEE VALLEY AUTHORITY |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| REF-PT21- 10CFR-050.55E, 10CFR-50.55E, NCR-YC-100, NUDOCS 8107310302 | |
| Download: ML20009F559 (2) | |
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TENNESSEE VALLEY AUTHORITgGIT"...
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-t 400 Chestnut Street Tower' g ' g*0 3GiA CH ATTA NOGG A. TENN ESSEEl..D f
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Mr. James P. O'Reilly, Director th[
(73 Office of Inspection and Enforcement J Q "m 0 1997 5 ;
U.S. Nuclear Regulatory Commission 6-Region II - Suite 3100 tA %gg%
101 Marietta Street Q
8 6
w Atlanta, Georgia 30303 sjf
Dear Mr. O'Reilly:
YELLOW CREEK NUCLEAR PLANT UNIT 1 - DEFICIENT hELDS ON GAS STRIPPER MODULE
- NCR YC-100 - REVISED FINAL REPORT The subject deficiency was :.nitially reported to NRC-0IE Inspector M. Thomas en October 8, 198'), in accordance with 10 CFR 50.55(e).
This was followed by our incerim reports dated November 6,1980, and February 5, 1981. Enclosed is a revision to our March 31, 1981, final report as discussed with B. R. Crowley on April 15, 1981. We consider 10 CFR 21 applicable to this deficiency.
If yoit have any questions concerning this matter, please get in touch with D. L. Lambert at FTS 857-2581.
Very truly yours, TENNESSEE VALLEY AUTHORITY hI L. M. Mills, Manager Nuclear Regulation and Safety Enclosure cc:
Mr. Victor Stello, Jr., Director (Enclosure)
Office of Inspecticn and Enforcement U.S. Nuclear Regulatory Commission Washingtor. DC 20555 So l 8107310302 810422 PDR ADOCK 05000567 S
PDR fa n Equal Ocportunit'/ EmDICve'
ENCLOSURE YELLOW CREEK NUCLEAR PLANT UNIT 1 e
DEFICIENT WELDS ON GAS STRIPPER MODULE NCR YC-100 10 CFR 50.55(e)
REVISED FINAL REPORT Description of Deficiency During installation of the gas stripper pump module (C_?M) at Yellow Creek Nuclear Plant, a TVA welding inspector noticed several weld deficiencies. For example, fillet welds were found to be undersized with some visible porosity. There also appeared to be a lack of penetration on butt welds. are strikes were visible. The GSPM is manufactured by Norwalk Fabricators.
It was purchased by TVA from Combustion Engineering.
Safety Implications The failure of the gas strippgr pump module could result in release of radioactive gaseous fission products (most notably the noble gases) through the ventilaticn system. This condition could adversely affect the safety of plant operations.
Corrective Action On March 17,_.1981, representatives of Norwalk Fabricators, Combustion Engineering, and TVA met in Windsor, Connecticut, to finalize an approach to making repairs. It was decided that Norwalk Fabricators would supervise the removal of all piping that was joined together by welds which did not meet the requirements of the. applicable ASME Code.
All of the removed piping is to be returned to Norwalk for repairs.
This work will be completed by July 31, 1981.
Corrective action to prevent recurrence will be addressed in final resolution to NCR YCN QAB 8101.
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