05000455/FIN-2008003-10

Finding

Title

Licensee-Identified Violation

Description

10 CFR 50.65(a)(4) requires in part, that the licensee shall assess and manage the increase in risk that may result from the proposed maintenance activities before performing maintenance. Contrary to the above, between April 5, 2008 to April 6, 2008, the licensee failed to consider that both Unit 1 Essential Service Water Train Cross-tie Isolation Valves, 1SX033 and 1SX034, were left opened and unable to be closed in the main control room in their risk evaluation before conducting the 1A EDG testing. This finding affected the mitigating capability during an internal flooding event in the auxiliary building. The finding was determined to be of very low safety significance for Unit 1 because the unit had been shutdown since March 23, 2008, decay heat load was low, and the time to boil was long. The licensee entered this issue into their corrective action program as IR 759945

10
Site:	Byron
Report	IR 05000455/2008003 Section 4OA7
Date counted	Jun 30, 2008 (2008Q2)
Type:	NCV: Green
cornerstone	Mitigating Systems
Identified by:	Licensee-identified
Inspection Procedure:
Inspectors (proximate)	B Bartlett C Acosta C Thompson C Zoia D Jones J Cassidy J Jacobson N Feliz Adorno R Jickling R Ng R Russell R Skokowski T Bilik V Meghani
INPO aspect
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v • d • e

Finding - Byron - IR 05000455/2008003

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

IR 05000455/2008003: 6 1 2 3 4 5 7 8 10

Finding List (Byron) @ 2008Q2

CCA Matrix: 2008Q2

	Q	CCA	Title
05000454/FIN-2007004-02	2007Q3	H.14	Inadequate Basis in 10 CFR 50.59 Evaluation Associated with a Special Test Procedure
05000455/FIN-2008002-03	2008Q1		Unit 2 Notice of Unusual Event Due to Loss of Both System Auxiliary Transformers
05000454/FIN-2008002-02	2008Q1	H.5	Plant Barrier Impairment Permit Not Followed
05000454/FIN-2008002-01	2008Q1	H.2	Failure to Evaluate Radiological Hazards for Alpha Radiation
05000454/FIN-2007009-05	2008Q1	P.1 P.1(a)	Failure to Identify Corroded 0SX138B Valve Bolting During VT-2 Examination
05000454/FIN-2007009-04	2008Q1	H.14	Trm Change Bypasses Procedure Change and Safety Evaluation Processes
05000455/FIN-2008002-04	2008Q1		Unit 1 Train B Auxiliary Feedwater Pump Diesel Fire and Shutdown During Surveillance
05000454/FIN-2007009-02	2008Q1	H.14	Failure to Implement Timely Corrective Actions for Degraded Sx Riser Piping
05000454/FIN-2008006-03	2008Q1	H.5	Unauthorized Transient Combustibles
05000454/FIN-2008006-02	2008Q1		Inadequate Corrective Actions for Motor Operated Valve Breaker Magnetic Trip Settings
05000454/FIN-2007009-01	2008Q1	H.14	Operating Experience Procedure Not Followed for Service Water Corrosion Event
05000454/FIN-2008006-01	2008Q1	H.9 H.2(b)	Failure to Perform 10 CFR 50.59 Evaluations for Changes in Assumed Operator Times
05000454/FIN-2007009-03	2008Q1	H.2(a) H.6	Inadequate Design Margins for Continued Operation of Sx Riser Pipes
05000455/FIN-2008003-04	2008Q2	H.2	Failure to Correctly Tighten Fittings Leads to Failure to Start During a Surveillance of the 0B Sx Makeup Pump
05000455/FIN-2008003-05	2008Q2	H.5	Failure to Perform an Updated Risk Evaluation Prior to Surveillance Testing of the Unit 1 Train a Diesel Generator Based on Existing Plant Conditions
05000455/FIN-2008003-07	2008Q2		Design Bases RE-ANALYSIS of the Ultimate Heat Sink
05000454/FIN-2008003-06	2008Q2		Unit 1 and Unit 2 Auxiliary Feedwater Tunnel Hatch Margin to Safety
05000455/FIN-2008003-03	2008Q2	H.8	Failure to Perform Evaluation of a Leaking Bolted Connection
05000455/FIN-2008003-01	2008Q2	H.8	Fire Suppression Sprinkler Obstruction in the Diesel Oil Storage Tank Room
05000455/FIN-2008003-02	2008Q2	H.14	Failure to Correctly Evaluate and Disposition of a Weld Indication

Self-Identified List (Byron)

	Q	Title
05000454/FIN-2008002-05	2008Q1	Licensee-Identified Violation
05000454/FIN-2008002-06	2008Q1	Licensee-Identified Violation
05000455/FIN-2008003-08	2008Q2	Licensee-Identified Violation
05000455/FIN-2008003-10	2008Q2	Licensee-Identified Violation

[Byron Findings full list]

05000455/FIN-2008003-10

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