ML19296B354

Forwards LERs 80-003/03L-0,80-004/03L-0,80-005/03L-0 & 80-006/03L-0

ML19296B354
Person / Time
Site:	Arkansas Nuclear
Issue date:	02/15/1980
From:	Trimble D ARKANSAS POWER & LIGHT CO.
To:	Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19296B355	List: 05000368/LER-1980-003-03, /03L-0:on 800120,during Mode 3 Operation, Emergency Feedwater Flow Control Valve Failed to Close on Demand.Caused by Lack of Hydraulic Pressure 05000368/LER-1980-004-03, /03L-0:on 800107,during Mode 1 Operation,Core Protection Calculator B Failed.Channel B DNBR & Linear Power Density Trips Were Bypassed Placing Reactor Trip Logic in two-out-of-three Trip Sequence.Cause Unknown 05000368/LER-1980-005-03, /03L-0:on 800123,during Steady State Mode 1 Operation,Reactor Coolant Leakage Calculation Indicated Approx 3.6 Gpm Unidentified Leakage.Caused by Packing on Pressurized Spray Valves Leaking Excessively 05000368/LER-1980-006-03, /03L-0:on 800123,during Mode 1 Operation,Core Protection Calculator B Failed,Generating DNBR & Linear Power Density Trips in Primary Power Sys.Cause Undetermined. Channel Restarted & Declared Operable ML19296B354
References
2-020-07, 2-20-7, NUDOCS 8002200444
Download: ML19296B354 (1)

Text

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ARKANSAS POWER & LIGHT COMPANY POST OFFICE box 551 UTTLE ROCK. ARKANSAS 72203 (501)371-4000 February 15, 1980 2-020-07 Mr. K. V. Seyfrit, Director Office of Inspection & Enforcement U.S. Nuclear Regulatory Commission Region IV 611 Ryan Plaza Drive, Suite 1000 Arlington, Texas 76011

Subject:

Arkansas Nuclear One-Unit 2 Docket No. 50-368 License No. NPF-6 Licensee Event Report Nos.

80-003/03L-0, 80-004/03L-0, 80-005/03L-0, and 80-006/03L-0 (File: 2-0520)

Gentlemen:

In accordance with Arkansas Nuclear One-Unit 2 Technical Specification 6.9.1.9.b, attached are the subject reports concerning the failure of the EFW flow control valve (80-003/03L-0), a Core Protection Calculator channel failure (80-004/03L-0 and 80-006/03L-0) and Reactor Coolant System unidentified leakage exceeding limits (80-005/05L-0).

Very truly yours, M6N d [

k David C. Trimble Manager, Licensing DCT: MAS:nak Attachments cc: Mr. Victor Stello, Jr., Director Mr. Norman M. Haller, Director Office of Inspection and Enforcement Office of Management and Program U.S. Nuclear Regulatory Commission Analysis Washington, D.C.

20555 U.S. Nuclear Regulatory Commission Washington, D.C.

20555 Mr..W. D. Johnson U.S. Nuclear Regulatory Commission Post Office Box 2090 Russellville, Arkansas 72801 90 o2200 Ok f /EMOE A MtOOLE SOUTH TIES SYSTEM