05000416/LER-1983-185, Updated LER 83-185/03X-1:on 831201,while in Cold Shutdown, Breaker 552-2105 Tripped,Causing Loss of Power to Div 1 ESF Bus & All Balance of Plant Loads.Caused by Two Shorted Wires in Breaker Hand Switch.Wires altered.W/840302 L

Updated LER 83-185/03X-1:on 831201,while in Cold Shutdown, Breaker 552-2105 Tripped,Causing Loss of Power to Div 1 ESF Bus & All Balance of Plant Loads.Caused by Two Shorted Wires in Breaker Hand Switch.Wires altered.W/840302 Ltr

ML20087C841
Person / Time
Site:	Grand Gulf
Issue date:	03/02/1984
From:	Byrd R, Dale L MISSISSIPPI POWER & LIGHT CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
AECM-84-0132, AECM-84-132, LER-83-185-03X, LER-83-185-3X, NUDOCS 8403130192
Download: ML20087C841 (3)

LER-2083-185, Updated LER 83-185/03X-1:on 831201,while in Cold Shutdown, Breaker 552-2105 Tripped,Causing Loss of Power to Div 1 ESF Bus & All Balance of Plant Loads.Caused by Two Shorted Wires in Breaker Hand Switch.Wires altered.W/840302 Ltr

Event date:
Report date:
4162083185R00 - NRC Website

text

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. March 2, 1984 NUCLEAR PRODUCTION DEPARTMENT U.S. Nuclear Regulatory Commission Region II 101 Marietta St., N.W., Suite 2900 Atlanta, Georgia 30303 Attention: Mr. J. P. O'Reilly, Regional Administrator

SUBJECT:

Grand Gulf Nuclear Station Unit 1 Docket No. 50-416 License No. NPF-13 File: 0260/L-835.0 Update Report - Loss of Power to Division 1 ESF Bus and BOP Loads LER 83-185/03 X-1 AECM-84/0132 This letter submits an update to a previous report submitted on December 20, 1983. The event for which the report was submitted occurred on December 1,1983, while in Cold Shutdown, when breaker 552-2105 from service transformer 21 tripped causing n loss of power to the Division 1 ESF bus and all BOP loads. This resulted in a reactor scram signal, a loss of RPS buses, loss of shutdown cooling, RWCU isolation, Containment / Auxiliary Building isolations, CRD "A" pump trip, SGTS initiation, Control Room SFAU initiation, and an automatic start of Diesel Generator 11. Action (a) of Technical Specification 3.4.9.2 was met. This was reported pursuant to Technical Specification 6.9.1.13.b.

This update revises the estimated completion date to complete permanent corrective action. The design change to implement this action is expected to be complete by May 31, 1984. Attached is LER 83-185/03 X-1 which is a final report.

Yours truly, L. F. Dale Manager of Nuclear Services EBS/SHH:rg Attachment cc: See next page ()FFICI AI. COPY

[3U f,

'l i Member Middle South Utilities System

AECM-84/0132

• #E' MIX 1.*alPPI POWER Q LIGHT COMPANY cc: ' Mr. J. B. Richard (w/a)

Mr. R. B. McGehee (w/o)

Mr. T. B. Conner (w/o)

Mr. C. B. Tayloe (w/o)

Mr. Richard C. DeYoung, Director (w/a)

Office of Inspection & Enforcement U. S. Nuclear Regulatory Commission Washington, D. C. 20555 1

Document Control Desk (w/a)

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

.