05000293/FIN-2012005-03

Finding

Title

Inadequate Design Control for Station Blackout Battery

Description

The inspectors identified a finding of very low safety significance (Green) because Entergy did not verify the adequacy of the design of the Station Blackout (SBO) battery as required by procedure EN-DC-126, Engineering Calculation Process. Specifically, Entergy used an incorrect minimum voltage for the SBO battery resulting in the sizing calculation significantly overstating the available design margin. Entergy entered the issue into their corrective action program (CR-PNP-2012-5076). This finding was more than minor because it was associated with the design control attribute of the Mitigating Systems Cornerstone and affected the cornerstone objective of ensuring the reliability of systems that respond to initiating events to prevent undesirable consequences. The finding was determined to be of very low safety significance (Green) because it was not a design or qualification deficiency, did not represent a loss of system safety function, and did not screen as potentially risk significant due to a seismic, flooding, or severe weather initiating event. This finding has a cross-cutting aspect in the area of Human Performance, Resources Component, because Entergy did not ensure that accurate design documentation was available. Specifically, Entergy used the incorrect minimum voltage for the SBO battery, resulting in nonconservative conclusions in the battery sizing calculation.

03
Site:	Pilgrim
Report	IR 05000293/2012005 Section 4OA2
Date counted	Dec 31, 2012 (2012Q4)
Type:	Finding: Green
cornerstone	Mitigating Systems
Identified by:	NRC identified
Inspection Procedure:	IP 71152
Inspectors (proximate)	T Moslak J Lilliendahl G Meyer S Pindale T Fish B Smith M Schneider R Bellamy M Orr
CCA	H.7, Documentation
INPO aspect	WP.3
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v • d • e

Finding - Pilgrim - IR 05000293/2012005

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

IR 05000293/2012005: 1 2 3 4

Finding List (Pilgrim) @ 2012Q4

CCA Matrix: 2012Q4

	Q	CCA	Title
05000293/FIN-2012003-01	2012Q2		Failure to Verify the Adequacy of the Design of MCC-B18 with Respect to Internal Flooding
05000293/FIN-2013003-01	2012Q2		Failure to Follow Procedures Results in Loss of Shutdown Cooling
05000293/FIN-2012004-01	2012Q3	H.5	Inadequate Processing of Work Package Results in Reactor Scram
05000293/FIN-2012403-01	2012Q3	H.6	Security
05000293/FIN-2012403-02	2012Q3	H.14	Security
05000293/FIN-2012403-03	2012Q3		Security
05000293/FIN-2012005-01	2012Q4		Failure to Verify the Adequacy of the Design of the SBO Fuel Oil Transfer System
05000293/FIN-2012005-02	2012Q4	P.3	Inadequate Corrective Actions for Station Blackout Battery
05000293/FIN-2012005-03	2012Q4	H.7	Inadequate Design Control for Station Blackout Battery
05000293/FIN-2012005-04	2012Q4	P.2	Failure to Evaluate Extent of Condition for B-15 Safety-Related Bus After Identifying an Overload Condition on the B-14 Safety-Related Bus

Self-Identified List (Pilgrim)

[Pilgrim Findings full list]

05000293/FIN-2012005-03

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