ML20076F786
| ML20076F786 | |
| 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 | |
| REF-PT21-83 10CFR-050.55E, 10CFR-50.55E, NUDOCS 8308260151 | |
| Download: ML20076F786 (2) | |
Text
---
pr l Q Il '.$
7 8#
TENNES $hALLEYsIALiTHORITY p,
g na ~.
CHATTANOOGA. TENNESSEE 37401 400 Chestnut S tgwerII August 18, 1983 BLRD-50-438/83-45 BLRD-50-439/83-38 U.S. Nuclear Regulatory Comission 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 UNITS 1 AND 2 - DESIGN OF AUXILIARY FEEDWATER PUMP TRIP AND THROTTLE VALVE ELECTRICAL CIRCUITS - BLRD-50-438/83-45, BLRD-50-439/83 FIRST INTERIM REPORT The subject deficiency was initially reported to NRC-0IE Inspector L. Watson on July 19, 1983 in accordance with 10 CFR 50.55(e) as NCR BLN EEB 8316. Enclosed is our first interim report. We expect to submit our next report by December 29, 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 L. M. Mills, Manager Nuclear Licensing Enclosure cc:
Mr. Richard C. DeYoung, Director (Enclosure)
Office of Inspection and Enforcement U.S. Nuclear Regulatory Comission Washington, D.C.
20555 Records Center (Enclosure)
Institute of Nuclear Power Operations 1100 Circle 75 Parkway, Suite 1500 Atlanta, Georgia 30339 l
OFFICI AL COPY 8308260151 830818 PDR ADOCK 05000438 f )fl g 1983-TVA SOTH ANNIVERSARY An Equal Opportunity Employer L
I
s*
ENCLOSURE BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 DESIGN OF AUXILIARY FEEDWATER PUMP TRIP AND THROTTLE VALVE ELECTRICAL CIRCUITS 10 CFR 50.55(e)
BLRD-50-438/83-45, BLRD-50-439/83-38 NCR BLN EEB 8316 FIRST INTERIM REPORT Description of Deficiency '
The electrical circuitry for the Auxiliary Feedwater Pump Turbine controls receives power through a manual transfer switch (1/2CA-43-003-S) from channel G (normal) and channel F (al~ ternate) of the 125V DC Class 1E power system (EU) and the 120V Class 1E AC Vital Power Distribution System (EJ). The transfer switch is designated and labeled S (special) for separation purposes; however, the cables, conduit, and equipment are designated and labeled G (channel G).
The design criteria " Physical Independence of Electrical Systems," NM4-50-D786, stipulates that circuits which can receive power from two divisions shall be identified as S and separated from all other wiring. Therefore, this circuit violates the requirements of the design criteria.
Interim Progress TVA is.still..rev.iewing _the _ subject deficiency _.tg determine the _ corr,ectlye_ action.,_ _
required. We will provide further details in our next report.
4 0
l wm _.
_e a -
...sp.
-.wm.....
.,u
._a
_