ML20115C004

Manual Opening of Reactor Trip Breakers and Subsequent Feedwater Isolation Signal & Manual Reactor Trip

ML20115C004
Person / Time
Site:	Sequoyah
Issue date:	07/05/1996
From:	Adney R TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML20115C007	List: 05000328/LER-1996-003-05, :on 960605,reactor Trip Breakers Manually Opened Because Shutdown Bank D Dropped Into Reactor Core.On 960607 Manual Reactor Trip Initiated Due to Dropped Rod. Added Caution Statement to Apropriate Operations Prcedure ML20115C004
References
NUDOCS 9607110130
Download: ML20115C004 (2)

Text

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Tennessee Valley Authority. Post Offee Box 2000. Soddy-Darsy. Tennessee 37379-2000

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R.J. Adney Site Vce President Sequoyah Nuclear Plant July 5,1996 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D.C. 20555 Gentlemen:

TENNESSEE VALLEY AUTHORITY - SEQUOYAH NUCLEAR PLANT (SQN)

UNIT 2 - DOCKET NO. 50-328 - FACILITY OPERATING LICENSES DPR I LICENSEE EVENT REPORT (LER) 50-328/96003 The enclosed report provides details concerning two events: 1) the manual opening of the reactor trip breakers and subsequent feedwater isolation signal; and 2) a manual reactor trip. In the first event, the reactor trip breakers were manually opened because of Shutdown Bank "D" dropping into the reactor core during testing. Upon the opening of the breakers, a feedwater isolation (FWI) signal '

automatically generated because 6f plant conditions (reactor coolant temperature beh WI setpoint). In the second event, the manual reactor trip was initiated because of a dropped rod. The rod drop was caused by a loose connection on a sensing resistor in the power supply to the rod. This report is being reported in accordance with 10 CFR 50.73(a)(2)(iv) as events or conditions that resulted in a manual or automatic actuation of an engineered safety feature, including the reactor protection system.

Sincerely, R. J Adney jpg17

- Enclosure cc: See page 2 2

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4 U.S. Nuclear Regulatory Commission Page 2 July 5,1996 -

Enclosure cc (Enclosure):

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INPO Pecords Center I

l Institute of Nuclear Power Operations 700 Gelleria Parkway Atlanta, Georgia 30339-5957 l

Mr. R. W. Hernan, Project Manager i

U.S. Nuclear Regulatory Cc,mmission One White Flint, North 11555 Rockville Pike l

Rockville, Maryland 20852-2739 NRC Resident Inspector l

Sequoye.h Nuclear Plant l

2600 Igou Ferry Road l

Soddy-Daisy, Tennessee 37379-3624 l

Regional Administrator U.S. Nuclear Regulatory Commission Region II l

101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323-2711 l

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