ML20083H412
| ML20083H412 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 12/27/1983 |
| 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 8401040493 | |
| Download: ML20083H412 (2) | |
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TENNESSEE VALLEY AUTHORITY CHATTANOOGA TENNESSEE 374ot 400 Chestnut Street Tower II December 27, fvesEC 29 A 8 : 58 BLRD-50-438/83-45 BLRD-50-439/83-38 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 UNITS 1 AND 2 - DESIGN OF AUXILIARY FEEDWATER PUMP TRIP AND THROTTLE VALVE ELECTRICAL CIRCUITS - BLRD-50-438/83-45, BLRD-50-439/83 SECOND 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. This was followed by our interim report dated August 18, 1983 Enclosed is our second interim report. We expect to submit our next report by April 2, 1984'.
In our first interim report, we inadvertently stated that 10 CFR Part 21 was applicable to this deficiency. Please note that it does not apply to this deficiency.
s If you have any questions, please get in touch with R. H. Shell at FTS 858-2688.
Very truly yours, TENNESSEE VALLEY AUTHORITY T
L. M. Mills, Manager Nuclear Licensing Enclosure oc:
Mr. Richard C. DeYoung, Director (Enclosure)
Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, D.C.
20555 Records Center (Enclosure)
Institute of Nuclear Power Operations 1100 Circle 75 Parkway, Suite 1500 Atlanta, Georgia 30339 0401040493 831222 PDR ADOCK 05000438 g
- 1983-TVA 5OTH ANNIVERSARY An Equal Opportunity Employer l
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ENCLOSURE o
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 SECOND INTERIM REPORT Description of Deficiency
.The electrical circuitry for t e Auxiliary Feedwater Pump Turbine controls h
receives power through a manual transfer switch (1/2CA-43-003-S) from channel G (normal) and channel F (alternate) of the-125V DC Class 1E power system (EU) and f
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 The identified components that receive normal and alternate power from channels G and F, respectively, will be identified as "S." The design revisions are being implemented by engineering change notices 2372 and 2833 e
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