05000219/FIN-2008005-04

Finding

Title

Failure of M1A Transformer Causes an Automatic Load Reject Scram

Description

An unresolved item was identified to review Exelons root cause assessment and licensee event report (LER) regarding the failure of the M1A main transformer and subsequent load reject scram to determine whether a performance deficiency existed which contributed to the transformer failure. The inspectors plan to review Exelons evaluation after it is completed, which had not occurred by the end of this inspection period. At 2101, November 28, Oyster Creek experienced a generator trip due to an A-phase and B-phase differential relay actuation, which resulted in a reactor shutdown due to a load reject scram. All safety systems operated as expected during the scram. The grid disturbance report provided by Jersey Central Power & Light, combined with information from the Oyster Creek Digital Protective Relay System, differential voltage and current indication data, and dissolved gas in oil analysis indicated that the fault occurred on the B phase of the M1A Main Power Transformer. Exelon entered this issue into their corrective action program in condition report IR 850348. (URI 05000219/2008004-04: Failure of M1A Transformer Causes an Automatic Load Reject Scram

04
Site:	Oyster Creek
Report	IR 05000219/2008005 Section 4OA3
Date counted	Dec 31, 2008 (2008Q4)
Type:	URI:
cornerstone	Mitigating Systems
Identified by:	NRC identified
Inspection Procedure:	IP 71153
Inspectors (proximate)	P Kaufman S Pindale J Kulp M Ferdas T Setzer R Nimitz N Perry R Bellamy C Crisdenr Nimitzd Spindler R Bellamy J Kulp J Schoppy M Ferdas S Barr T Setzer
INPO aspect
'
v • d • e

Finding - Oyster Creek - IR 05000219/2008005

1(0)2(1)3(4)4(3)5(5)6(0)7(1)8(1)9(0)301(0)302(0)402(0)403(0)18(0)

IR 05000219/2008005: 1 2 3 4 5

Finding List (Oyster Creek) @ 2008Q4

CCA Matrix: 2008Q4

	Q	CCA	Title
05000219/FIN-2008002-01	2008Q1	H.5	Inadequate Risk Assessment Identified Prior to Commencement of Maintenance
05000219/FIN-2008008-01	2008Q2		Failure to Review the Impact of Site Staffing Changes to the Fire Protection Program
05000219/FIN-2008003-01	2008Q2	H.9 H.2(b)	Improper Valve Reassembly Results in Instrument Air Transient
05000219/FIN-2008003-02	2008Q2		Instrument Air Transient Due to Insufficient Preventive Maintenance on Service Air Compressors
05000219/FIN-2008003-04	2008Q2	H.9	Diesel Driven Fire Pump Unavailable Due to Improper Testing
05000219/FIN-2008003-03	2008Q2	H.4 H.5	Potential Preconditioning of Core Spray Valves Prior to ASME In-service Test
05000219/FIN-2008004-02	2008Q3		Water with Tritium Identified in Excavation Area within the Protected Area
05000219/FIN-2008004-01	2008Q3	H.8	Scaffold Installation Procedure Not Properly Implemented
05000219/FIN-2008007-01	2008Q4		Drywell Sand Bed Water Intrusion, Drain Monitoring, and Coating Deficiency
05000219/FIN-2008005-03	2008Q4		Stack Radiation Monitoring System Sampling Capabilities
05000219/FIN-2008005-04	2008Q4		Failure of M1A Transformer Causes an Automatic Load Reject Scram
05000219/FIN-2008005-01	2008Q4	H.7	Conduct of Maintenance Procedure Not Properly Implemented
05000219/FIN-2008005-02	2008Q4	H.7	Core Alterations Performed Without the Required Configuration of Source Range Nuclear Monitors

Self-Identified List (Oyster Creek)

	Q	Title
05000219/FIN-2008004-03	2008Q3	Licensee-Identified Violation
05000219/FIN-2008005-05	2008Q4	Licensee-Identified Violation

[Oyster Creek Findings full list]

05000219/FIN-2008005-04

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