ML19274F811

Forwards LERs 79-048/03L-0,79-049/03L-0,79-050/03L-0, 79-051/03L-0 & 79-052/03L-0

ML19274F811
Person / Time
Site:	Arkansas Nuclear
Issue date:	07/31/1979
From:	Trimble D ARKANSAS POWER & LIGHT CO.
To:	Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19274F812	List: 05000368/LER-1979-048-03, /03L-0 on 790703:startup Channel Excore Nuclear Log Count Ratemeter on Remote Shutdown Indicated Incorrectly During Mode 1 Operation.Cause Not Stated. Feedback Wiper Arm Cleaned 05000368/LER-1979-049-03, /03L-0 on 790703:hydraulic Snubber Visual Insp Surveillance Not Performed on Schedule.Caused by Erroneous Assumption by Plant Personnel That Surveillance Performed During Reactor Coolant Pump Motor Maint 05000368/LER-1979-050-03, /03L-0 on 790703:control Room Emergency Air Conditioner 2VE1-A Failed to Start from Control Room Panel 2c33 During Mode 1.Caused by High Pressure Switch Tripping Due to Low Water in Condenser 05000368/LER-1979-051-03, /03L-0 on 790706:emergency Feedwater Flow Control Valves from Electric Driven Pump to Steam Generator a Failed to Close from Control Room Demand Signal.Cause Not Stated.Valve Tested & Motor Replace 05000368/LER-1979-052-03, /03L-0 on 790708:core Protection Calculator B Failed Causing Low DNBR & High Linear Power Density Trips in Plant Protection Sys B.Caused by Lost Bit in High Core Memory Due to Failed Air Conditioner in Computer Room ML19274F811
References
2-079-17, 2-79-17, NUDOCS 7908060468
Download: ML19274F811 (1)

Text

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ARKANSAS POWER S LIGHT COMPANY POST OFFICE BOX 551 LITTLE ROCK. ARKANSAS 72203 (501)371-4000 July 31, 1979 2-079-17 Mr. K. V. Seyfrit, Director Office of Inspection and Enforcement U. S. Nuclear Regulatory Comm.

Region IV 611 Ryan Plaza Drive, Suite 1000 Arlington, TX 76011

Subject:

Arkansas Nuclear One-Unit 2 Docket No. 50-368 License No. NFP 6 Reportable Occurrence Report Nos. 50-368/79-048; 50-36S/79-049; 50-36S/79-050; 50-368/79-051 and 50-368/79-52 (File:

2-0520 )

Gentlemen:

In accordance with Arkansas Nuclear One - Unit 2 Technical Speci-fication 6.9.1.9, we have attached the subj ect reports concerning the inoperability of the startup channel excore Nuclear Log Count Ratemeter to indicate correctly (79-048); the failure to perform the Hydraulic Snubber Visual Inspection within defined time limits (79-049);

the failure of the Control Room Emergency air conditioner to work (79-050); the failure of to Emergency Feedwater flow control valves to close upon a demand si nal (79-051); and, the failure of the "B"

t Core Protection Calculator causing low DNBR and high LPD trips in the "B" PPS (79-052).

Verv truly yours, e

Dtg David C. Trimble Manager, Licensing DCT: BI: gp Attachment Mr. Norman M. Haller, Director cc:

Mr. Victor Stello, Jr. Director Office of Management and Office of Inspection and Enforcement Program Analysis U. S. Nuclear Regulatory Comm.

7 U. S. Nuclear Regulatory Comm.

Washington, DC 20555 0

Washington, DC 20555 y

g g y Q Mr. W. D. Johnson U. S. Nuclear Regulatory Comm.

Meveen u:oote souTs uTitivies sysTeh