ML20084G591
| ML20084G591 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 04/17/1984 |
| From: | Mills L TENNESSEE VALLEY AUTHORITY |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| NUDOCS 8405070285 | |
| Download: ML20084G591 (2) | |
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d TENNESSEE VALLEY AUTHORITY CHATTANOOGA TENNESSEE s74ot 400 Chestnut Street Tower II April 17,1984 BLRD-50-438/82-51 BLRD-50-439/82-46 U.S. Nuclear Regulatory Commission Region II Attn:
Mr. Jamee P. O'Reilly, Regional Administrator -
101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30303
Dear Mr. O'Reilly:
BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 - DEFICIENCI IN UNDERVOLTAGE PROTECTION DURING AN ACCIDENT - BLRD-50-438/82-51, BLRD-50-439/82 FIFTH INTERIM REPORT j
The subject deficiency was initially reported to NRC-0IE Inspector R. V. Celenjak on July 27, 1982 in coordance with 10 CFR 50.55(e) as i
NCR BLN EEB 8205. This was followed by our interim reports dated August 25 and November 19, ~ 1982 and, January 17 and September 15, 1983._ Enclosed is our fifth interim report. We expect to submit our next report by October 17, 1984.
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 D5 %
. fat.L.'M. Mills,' Manager
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Nuclear Licensing Enclosure oc:
Mr. Richard C. DeYoung, Director (Enclosure)
Office of Inspection' and Enforcement U.S. Nuclear Regulatory Commission Washington, D.C.
20555' i
Records Center (Enclosure)
Institute of Nuclear Power Operations 1100 Circle 75 Parkway,? Suite 1500 Atlanta, Georgia 30339 8405070285 840417 PDR ADOCK 05000438 5
PDR _.
1983 TVA 5OTH ANNIVERSARY ~
An Equal Oppcetunity Employer gg l'
ENCLOSURE BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 DEFICIENCY IN UNDERVOLTAGE PROTECTION DURING AN ACCIDENT NCR BLN EEB 8205 BLRD-50-438/82-51, BLRD-50-439/82-46 10 CFR 50.55(e)
FIFTH INTERIM REPORT Description of Deficiency During a design review, it was determined that the present design of the additional level of under-or overvoltage protection does not fully comply with the requirements as stated in Bellefonte Final Safety Analysis Report Question 430.38 and the guidelines in NRC branch technical position PSB-1.
Misinterpretation of these requirements by TVA caused the original design not to consider a degraded voltage concurrent with an accident. Because of this misinterpretation, the time delay selected to initiate separation of the Class IE distribution system from the degraded offsite power system will not permit connection to the alternate or emergency power systems soon enough to ensure adequate voltages for the required safety-related motors.
Interim Progress System design and procurement activities associated with engineering change notice 1559 have been completed. The analysis to determine the voltage and time-delay setpoints is still in the process of being checked. Our final report will be provided upon approval of the analysis.
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