ML20072N110
| ML20072N110 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 03/22/1983 |
| 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 8304010447 | |
| Download: ML20072N110 (2) | |
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s TENNESSEE VALLEY AUTHORITY CH ATTANOOG A. TENNELSEE 374ot 400 Chestnut Street Tower II March 22, 1983
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U.S. Nuclear Regulatory Commission
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Region II t
Attn:
Mr. James P. O'Reilly, Regional Administrator o
101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30303
Dear Mr. O'Reilly:
BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 - ROUTING OF MAKEUP TANK OUTLET LINES - BLRD-50-438/82-72, BLRD-50-439/82 SECOND INTERIM REPORT The subject deficiency was initially reported to NRC-0IE Inspector C. W. Hehl on October 15, 1982 in accordance with 10 CFR 50.55(e) as NCR BLN BLP 8228. This was followed by our first interim report dated November 12, 1982. Enclosed is our second interim report. We expect to submit our next report by December 23, 1983 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. M. Mills Manager Nuclear Licensing Enclosure cc:
Mr. Richard C. DeYoung, Director (Enclosure)
Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, D.C.
20555 e304010447 830322 LOFFICIAL COPY PDR ADOCK 05000438 S
(( J f An Equal Opportunity Employer
M' ENCLOSURE BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 ROUTING OF MAKEUP TANK OUTLET LINES NCR BLN BLP 8228 BLRD-50-438/82-72, BLRD-50-439/82-66 10 CFR 50.55(e)
SECOND INTERIM REPORT Description of Deficiency The present routing of the Makeup and Purification System makeup tank outlet line to the train A makeup pumps will let dissolved gases (mainly hydrogen) come out of solution because of the pressure drop in the line and collect at the high point of the pfping. The gas buildup will result in reduced net positive suction head available to the pumps and result in pump damage. The train A pumps are the only pumps affected by this condition.
Interim Progress TVA has chosen to reroute the makeup tank outlet line to an elevation below the makeup tank water level to prevent the dissolved gases (mainly hydrogen) from coming out of solution. Analysis of both the revised piping arrangement and the rerouting of electrical cables to a relocated motor operated valve remain to be completed.
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