05000352/FIN-2011008-01

Finding

Title

Station Blackout Licensing Basis Assumed Alternate AC Power Source.

Description

The inability to satisfy the licensing basis assumed alternate AC power source (i.e., three EDG\\\'s on the non-blacked out unit without using recovery procedures) during a certain Unit 1 station blackout event requires further review to determine compliance with 10 CFR Part 50.63, Loss of AllAlternate Current Power. The licensee entered this issue into the CAP as lR 1208490, Potential Station Blackout Procedure Bases Licensing lssue. This unresolved item (URl) is identified as URI 05000352, 35312011008-01, Station Blackout Licensing Basis Assumed Alternate AC Power Source.

01
Site:	Limerick
Report	IR 05000352/2011008 Section 4OA5
Date counted	Jun 30, 2011 (2011Q2)
Type:	URI:
cornerstone	Mitigating Systems
Identified by:	NRC identified
Inspection Procedure:
Inspectors (proximate)	J Rady C Williams K Mangan L Doerfleine Dipaolon Sieller L Doerflein T Hedigan
INPO aspect
'
v • d • e

Finding - Limerick - IR 05000352/2011008

1(0)2(2)3(3)4(4)5(1)7(1)8(1)403(0)404(0)501(0)502(0)503(2)9(0)15(0)

IR 05000352/2011008: 1

Finding List (Limerick) @ 2011Q2

CCA Matrix: 2011Q2

	Q	CCA	Title
05000352/FIN-2010004-02	2010Q3		Failure to Identify Incorrectly Adjusted Control Power Relay Resulting in Unit 1 Manual Scram
05000352/FIN-2010402-02	2010Q3	P.1	Security
05000352/FIN-2010004-01	2010Q3		Failure to Take Compensatory Action for Inoperable Fire Door
05000352/FIN-2010004-03	2010Q3	H.7	Failure to Perform Adequate PM on EDGs
05000352/FIN-2010007-01	2010Q4		Failure to Update UFSAR Consistent With Plant Conditions as Required
05000352/FIN-2010007-02	2010Q4	P.3	Three of Four RHR Unit Coolers Unreliable due to Planned and Unplanned Conditions (Silting)
05000352/FIN-2010403-01	2010Q4	H.8	Security
05000352/FIN-2011002-01	2011Q1	P.2	Failure to Address Repeat TS Response Time Test Failures
05000352/FIN-2011003-01	2011Q2	H.12	Failure to Position Recirculation lsolation Valves in Accordance with Clearance
05000352/FIN-2011003-03	2011Q2	P.4	Failure to ldentify Adverse Trend regarding Out-of-Calibration lnstrumentation
05000352/FIN-2011008-01	2011Q2		Station Blackout Licensing Basis Assumed Alternate AC Power Source.

Self-Identified List (Limerick)

	Q	Title
05000352/FIN-2010004-04	2010Q3	Licensee-Identified Violation
05000352/FIN-2011002-02	2011Q1	None
05000352/FIN-2011003-04	2011Q2	Licensee-Identified Violation

[Limerick Findings full list]

05000352/FIN-2011008-01

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