ML19263C266

Forwards LERs 79-004/03L-0,79-005/03L-0,79-006/03L-0, & 79-008/03L-0

ML19263C266
Person / Time
Site:	Arkansas Nuclear
Issue date:	02/07/1979
From:	Rueter D ARKANSAS POWER & LIGHT CO.
To:	Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19263C267	List: 05000368/LER-1979-004-03, /03L-0 on 790107:during Power Escalation Testing, Both Control Element Assembly Clusters Declared Inoperable. Caused by Weak Reed Switch Position Transmitter Power Supply 05000368/LER-1979-005-03, /03L-0 on 790109:during Power Escalation Testing, Bistable Primary Power System 6 C Failed,Rendering C Pressurizer Low Pressure Trip Inoperable 05000368/LER-1979-006-03, /03L-0 on 790109:during Power Escalation Testing, B Core Protection Computer Declared Inoperable When Low Pressurizer Pressure Trips Received.Investigation Showed Ground Fault Relays Fall Out on Low Bus Voltage 05000368/LER-1979-008-03, /03L-0 on 790114:during Power Ascension Testing, Refueling Water Tank Level transmitter,2LT-5639-3,sensing Line Froze Due to Temporary Heat Lamp Burnout ML19263C266
References
FOIA-79-149 2-029-6, 2-29-6, NUDOCS 7902130160
Download: ML19263C266 (2)

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HELPING B UIL D ARKAN9AS A AK ANS AS POWER & LIGHT COMPA NY P O. BOY. 551

• LITTLE AOCK. AA<ANSAS 72203 *(501)371-4191 February 7, 1979 OONALD A. RUETER DIRECTOR TECHNICAL AND ENVIRONMENTAL SEAVICES 2-029-6 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 Reportable Occurrence Report Nos. 50-368/79-03; 50-368/79-04; 50-368/79-05; and 50-368/79-06; and 50-368/79-08 (File:

2-0520)

Gentlemen:

In accordance with Arkansas Nuclear One-Unit 2 Technical Specifica-tion 6.9.1.9, we have attached the subject reports concerning the inoperability of both CEAC's due to spurious CEA position indication (79-04); inoperability of the channel "C" Pressurizer Low Pressure Trip (79-05); the CPC channel "B" being declared inoperable and placed in a bypass condition (79-06) and the inoperability of one Refueling Water Tank RWT level in PPS "C" due to a frozen trans-mitter sensing line (79-08).

Reportable Occurrence Report number 50-368/79-03 was voided after being determined not reportable.

Reportable Occurrence Report number 50-368/79-04 is being submitted late.

This incident is attributed to unavoidable processing delays 7 9 0 213 01 Coo TAM P AvlNG. INVE S TO A OWNE O MEMDEA MIDDLE GOUTH UTIUTIES SYSTEM

A Mr. K. V. Seyfrit, Director February 7, 1979 Page Two and we believe this to be an isolated situation.

Very truly yours, Donalcl A. Rueter DAR/mmb Attachments cc:

Mr. John G. Davis, Acting Director Office of Inspection & Enforcement U. S. fluclear Regulatory Commission Washington, D. C. 2055.5 Mr. Norman M. Haller, Director Office of Management Information and Program Control U. S. Nuclear Regulatory Commission Washington, D. C. 20555

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