05000416/LER-1983-060-03, /03L-0:on 830329,during Cold Shutdown,Load Shedding & Div I LSS Sequencing Panel Failure Alarm Actuated.Caused by Failure of 15-volt Dc Power Supply Used to Power Solid State Electronics for Sys Logic

/03L-0:on 830329,during Cold Shutdown,Load Shedding & Div I LSS Sequencing Panel Failure Alarm Actuated.Caused by Failure of 15-volt Dc Power Supply Used to Power Solid State Electronics for Sys Logic

ML20023B554
Person / Time
Site:	Grand Gulf
Issue date:	04/28/1983
From:	Byrd R MISSISSIPPI POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20023B542	List: 05000416/LER-1983-060, Forwards LER 83-060/03L-0 05000416/LER-1983-060-03, /03L-0:on 830329,during Cold Shutdown,Load Shedding & Div I LSS Sequencing Panel Failure Alarm Actuated.Caused by Failure of 15-volt Dc Power Supply Used to Power Solid State Electronics for Sys Logic
References
LER-83-060-03L, LER-83-60-3L, NUDOCS 8305050178
Download: ML20023B554 (2)

LER-1983-060, /03L-0:on 830329,during Cold Shutdown,Load Shedding & Div I LSS Sequencing Panel Failure Alarm Actuated.Caused by Failure of 15-volt Dc Power Supply Used to Power Solid State Electronics for Sys Logic

Event date:
Report date:
4161983060R03 - NRC Website

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e EVENT DESCRIPTION AND PROSABLE CONSE0ptseCES h o 2 [On March 29. 1983. while in Cold Shutdown. a Load Sheddino and I

o 3 l Sequencing (LSS) panel failure alarm actuated.

The Division I LSS 1

o 4 l system, the Division I Diesel Generator, LPCI A and LPCS were 1

o s l subsequently declared inoperable.

The Division II Diesel Generator was 1 o s lavailable.

LPCI C was the only operable ECCS system, therefore, an 1

o 7 [LCO was entered pursuant to T.S.3.5.2.

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[ go-] lThe cause was f ound to be f ailure of the 15V DC power supply used to j

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The power supply was replaced on April 9, 1983.

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Attachmsnt to AECM-83/0261 Page 2 of 2 SUPPLEMENTARY INFORMATION TO LER 83-060/03 L-0 Mississippi Power & Light Company.

Grand Gulf Nuclear Station - Unit 1 Docket No. 50-416 Technical Specification involvtd: 3.5.2

- Reported Under Technical Specification: 6.9.1.13.b Event Narrative:

On March 29, 1983, while in Cold Shutdown, a Division I Load Shedding and Sequencing panel failure alarm actuated. Upon investigation'it was determined that power was available.to the panel, however, some indicating lights were off. A subsequent maintenance investigation found the internal 15V DC power supply failed. The power supply powers solid state circuits for system logic and timing functions. The power supply was replaced and LSS Division I was restored on April 9, 1983.

During the event, an LCO was entered under T.S.3.5.2 due to LPCI C being the only operable ECCS system. Division I (D/G 11, LPCI A, and LPCS) was declared inoperable due to inoperability of LSS Division I.

HPCS was inoperable due to maintenance being performed on the HPCS and D/G 13 systems. LPCI B was inoperable due to the SSW B system being down for maintenance. This is submitted as a final report.

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