ML20076F508
| ML20076F508 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 08/18/1983 |
| 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, NCR-1976, NUDOCS 8308260063 | |
| Download: ML20076F508 (3) | |
Text
e TENNESdIESWALLI.iEY;A'UgHORITY G',
dNNESS 374o1 CHATIA O A
400 Chestnut Street Tower II NN Aug a 1983 BLRD-50-438/83-11 U.S. Nuclear Regulatory Commission Region II Attn:
Mr. James P. O'Reilly, Regional Administrator 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30303
Dear Mr. O'Reilly:
BELLEFONTE NUCLEAR PLANT UNIT 1 - GENERAL ELECTRIC MOTORS EXCEED RATED LOAD
- BLRD-50-438/83 REVISED FINAL REPORT The subject deficiency was initially reported to NRC-0IE Inspector P. E. Fredrickson on January 10, 1983 in accordance with 10 CFR 50.55(e) as NCR 1976. This was followed by our interim report on February 8,1983 and our final report on July 29, 1983 Enclosed is our revised final report.
In our previous report TVA had stated that the premature motor failures documented in NCRs 2102 and 2285 (BLRD-50-438/83-02) may have been due to long-term overload. However, investigation has shown that the premature failures were not caused by this condition as there was insufficient evidence of overheating of the entire winding. Also, the failures were located in either the top coil in the stator slot at the end, or the stator core, which suggests that the failures could not have been primarily caused by the motor overheating due to the plugged air passages in the stator.
Consequently, TVA no longer considers NCRs 2102 and 2285 related to NCR 1976.
TVA does not now consider the subject nonconforming condition adverse to the safe operation of the plant. Therefore, we will amend our records to delete the subject nonconformance as a 10 CFR 50.55(e) item.
Our final report contained a typographical error which changed the essence of the report. Thus, to clarify the final report TVA has decided to issue a revised final report.
If you have any questions, please get in touch with R. H. Shell at FTS 858-2688.
Very truly yours, TENNESSEE VALLEY AUTHORITY B308260063 830818 L. M. Mills, Manager PDR ADOCK 05000438 S
PDR Nuclear Licensing Enclosure
'OSTb W cc: See page 2 1983-TVA 50m ANNIVERSARY (3
g An Equal Opportunity Employer
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~2-U.S. Nuclear Regulatory Coimaission August 18, 1983 i
cc: Mr. Richard C. DeYoung, Director (Enclosure)
Office of Inspection and Enforcement U.S. Nuclear Regulatory Connission Washington, D.C.
20555 Records Center (Enclosure)
Institute of Nuclear Power Operations 1100 Circle 75 Parkway, Suite 1500 Atlanta, Georgia 30339 1
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-ENCLOSURE BELLEFONTE NUCLEAR PLANT UNIT 1 i
GENERAL ELECTRIC MOTORS EXCEED RATED LOAD BLRD-50-438/83-11 NCR 1976 REVISED FINAL REPORT.
10 CPR 50.55(e)
Description of Deficiency Current readings taken on two 150 hp General Electric (GE) induction motors supplied by Ingersoll Rand (I-R), Chamblee, Georgia, exceeded their.
nameplate value of 195 amperes. The increased current cculd be partially.,
attributeg to TVA operatfn*g the comgressors at a dischar'ge pressure of.
110 lb/in instead of the 100 lb/in originally specified in the c ontract.
Safety Implications As specified in TVA contract 76K31-86849, the subject motors were to be operated' 2
at 100 lb/in g and 720 sofm air delivery. Af ter the compressors were delivgred TVA requested that the operating pressure be increased to 110 lb/in g.
Subsequently, I-R agreed to reset-the compressor safety valves for proper operation at the increased discharge pressure. Measurements were taken in the field _which. have shown. tgat.at.the design, conditions..of.120 s_oftand_a discharge pressure of 100 lb/in g, the compressors required 149.88 hp from the 150 hp motor instead of the 140 hp value provided.to TVA by I-R.
Operation at the increased discharge pressure requires the motor to operate at approximately 110 percent of the nameplate rating. However, The subject motors are capabfe of electrical operation at 115 percent of the nameplate rating on a continuous basis.
Although the motors age capable of continuous ope' ration at the h; creased pressure of 110 lb/in, TVA will replace the exisiting' motors (und'er engineering change notice (ECN) 1916) with motors that meet the present quality assurance and environmental qualification requirements.- The specification for the replacement motors will now allow continuous operation within the service factor horsepower range which will ensure that the current required by the motor will not exceed the value shown on the motor nameplate during normal operation.
Inasmuch as the subject motors are capable of electrical operation at 115 percent of the nameplate horsepower rating on a continuous basis it is our conclusion that there are no conditions adverse,to the safe operation-of the plant concerning this specific deficiency, and we no longer consider 10 CFR 50.55(e) applicable.
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