ML20086M409

Forwards LER Re Automatic Reactor Trip That Occurred as Result of lo-lo SG Level.During Process of Establishing Clearance for Maint Activity on Radiation Monitor,Assistant Unit Operator Opened Wrong Breaker

ML20086M409
Person / Time
Site:	Sequoyah
Issue date:	07/18/1995
From:	Adney R TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML20086M415	List: ML20086M409
References
NUDOCS 9507240277
Download: ML20086M409 (2)

Text

- - _ _ _ _ _ _ _ _ -._ _____ -.

'IUA Tennessee Valley Authority Post Office Box 2000. Soddy-Datsy. Tennessee 37379 July 18, 1995 U.S. Nuclear Regulatory Commission -

ATTN: Document Control Desk Washington, D.C. 20555 Gentlemen:

. TENNESSEE VALLEY AUTHORITY - SEQUOYAH NUCLEAR PLANT UNIT 1 - DOCKET No. 50-327 - FACILITY OPERATING LICENSE DPR LICENSEE EVENT REPORT (LER) 50-327/95008  ;

The enclosed LER provides details concerning an automatic reactor trip )

that occurred as a result of a lo-lo steam generator level. During the l process of establishing a clearance for a maintenance activity on a j l

radiation monitor, an assistant unit operator opened the wrong breaker.

This resulted in a loss of power to Reactor Protection Set 1. The loss of l power to the protection set caused a reduction in feedwater flow, l resulting in decreasing levels in the steam generators and a subsequent j reactor trip. This event is being reported in accordance with i 10 CFR 50.73(a)(2)(iv) as an event that resulted in the automatic l actuation of engineered safety features, including the reactor protection  !

system.

1 Sincerely, hR.J.hdney .

Site Vice President Enclosure cc: See page 2 25005i hE'*UEEl Qg;ge,,

PDR j

72

, 4 U.S.* Nuclear Regulatory Commission Page 2 July 18, 1995 cc (Enclosure):

INPO Records Center '

Institute of Nuclear Power Operations 700 Galleria Parkway Atlanta, Georgia 30339-5957 Mr. D. E. LaBarge, Project Manager U.S. Nuclear Regulatory Commission One White Flint, North 11555 Rockville Pike Rockville, Maryland 20852-2739

- NRC Resident Inspector Sequoyah Nuclear Plant 2600 Igou Ferry Road Soddy-Daisy, Tennessee 37379-3624 Regional Administrator U.S. Nuclear Regulatory Commission .

Region II )

101 Marietta Street, NW, Suite 2900 1 Atlanta, Georgia 30323-2711 I

l l