ML20077D194
| ML20077D194 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 07/20/1983 |
| From: | Mills L TENNESSEE VALLEY AUTHORITY |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| REF-PT21-83 NUDOCS 8307260419 | |
| Download: ML20077D194 (2) | |
Text
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t TENNESSEE VALLEY AUTHORITY CHATTANOOGA. TENNESSEE 374o1 400 Chestnut Street Tower II c2 DC July 20, 1983 W
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BLRD-50-438/83-42 N
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U.S. Nuclear Regulatory Conunission
'Q Region II 3
i3 Attn:
Mr. James P. O'Reilly, Regional Administrator CP
$9 101 Marietta Street, NW, Suite 2900
$7' Atlanta, Georgia 30303 3
7
Dear Mr. O'Reilly:
BELLEFONTE NUCLEAR PLANT UNIT 1 - MAKEUP /HIGH PRESSURE INJECTION PUMP VIBRATION -BLRD-50-438/83 FIRST INTERIM REPORT The subject deficiency was initially re;.orted to NRC-0IE Inspector Linda Watson on June 22, 1983 in accordance with 10 CFR 50.55(e) as NCR BLN 2393 Enclosed is our first interim report. We expect to submit our next report by December 2, 1983 We consider 10 CFR Part 21 applicable to this deficiency.
If you have any questions, please get in touch with R. H. Shell at FTS 858-2688.
Very truly yours, TENNESSEE VALLEY AUTHORITY DS W 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.
2055-Records Center (Enclosure)
Institute of Nuclear Power Operatioa 1100 Circle 75 Parkway, Suite 1500 Atlanta, Georgia 30339 8307260419 830720 PDR ADOCK 05000438 9
PDR OFFICTAL copy 1983-TVA SOTH ANNIVERSARY
[g An Equal Opportunity Employer
L ENCLOSURE BELLEFONTE NUCLEAR PLANT UNIT 1 MAKEUP /HIGH PRESSURE INJECTION PUMP VIBRATION BLRD-50-438/83-42 NCR 2393 10 CFR 50.55(e)
FIRST INTERIM REPORT Description of Deficiency Measured vibration levels on one of the three makeup /high pressure injection (MU/HPI) pumps provided by Babcock & Wilcox (B&W) for Bellefonte unit 1 are not consistently below the established high level limit of 0.75 mils. After the high vibration problem was noted, an attempt by B&W was made to balance the rotating assembly in November 1982. The effort was not successfbl. It was noted at that time that the vibration level on the pump varied with the temperature of the pump.
Since the attempt to balance the rotating assembly en site was not successful, the inner casing and rotating assembly were removed and shipped to the manufacturer, Bingham-Willamette in Portland, Oregon. The shaft and rotating assembly were examined by Bingham and returned to Bellefonte 'in March 1983 The pump was reassembled and fbrther vibration testing was completed. The initial vibration levels of the reassembled pump were high
'(2.5 to 3 0 mils displacement). B&W again attempted to balance the pump rotating assembly. Vibration levels were reduced to a level below the 0.75 mils limit for approximately 70 percent of the measurements, with the remainder of the measurements at or greater than the 0.75 mils limit. The pump to date has failed. to operate within the vibration limit on a consistent basis and still shows a significant variation of the vibration level with temperature.
Interim Progress TVA has forwarded this NCR to B&W for their evaluation and recommended corrective actions. B&W was also requested to advise TVA of a method for reducing the pump vibration level to an acceptable, stable figure and to address the root cause of the high vibration level in their response.
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