05000296/LER-1979-018, Forwards LER 79-018/01T-0

Forwards LER 79-018/01T-0

ML18024B103
Person / Time
Site:	Browns Ferry
Issue date:	11/13/1979
From:	Calhoun J TENNESSEE VALLEY AUTHORITY
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18024B104	List: 05000296/LER-1979-018, Forwards LER 79-018/01T-0 05000296/LER-1979-018-01, /01T-0:on 791030,RHR Pumps 3A & 3C Led to Differential Relay Operation & Interruption of Normal Supply to Shutdown Boards 3EA & 3EB from Unit Board 3A.Caused by Mismatch of Current Transformer Ratios on Normal Supply
References
79113-03, 79113-3, NUDOCS 7911160524
Download: ML18024B103 (2)

LER-1979-018, Forwards LER 79-018/01T-0

Event date:
Report date:
2961979018R00 - NRC Website

text

November 13, 197 0

TENNESSEE VALLEYAUTHORITY CHATTANOOGA. TENNESSEE 37401 716 Edney Building i

Mx. James P

O'Reilly, Director U.S. Nucl r Regulatory Commission Office o Inspection and Enforcement Region I 101 rietta Street, Suite 3100 Atlanta, Georgia 30303

Dear Mr. O'Reilly:

TENNESSEE VALLEY AUTHORITY-BROWNS FERRY NUCLEAR PLANT UNIT 3 - DOCKE NO, SO-296 - FACILITY OPERATING LICENSE DPR REPORTABLE OCCURRENCE REPORT BFRO-50-296(7918 The enclosed xeport provides details concerning a simultaneous start of residual heat removal system pumps 3A and 3C which resulted in a differential relay operation which caused an interruption of the normal supply to

, shutdown boards 3EA and 3EB from unit board 3A during low-pressure coolant in)ection logic testing.

This report is submitted in accordance with Browne Ferry unit 3 Technical Specification 6.7.2.a.(9)

~

Very truly yours, TENNESSEE VALLEY AUTHORITY J.

R. Calhoun Director of Nuclear Power Enclosure (3) cc (Enclosure):

Director (3)

Office of Management Informat U.S. Nuclear Regulatory Commi Washington, DC

,20555 on and Program Control sion Director (40)

Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, DC 20555 R. F. Sullivan, NRC Inspector, Browns Ferry An Equal Opportunity Employer goo>

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