05000455/FIN-2008002-03: Difference between revisions

Finding

Title

Unit 2 Notice of Unusual Event Due to Loss of Both System Auxiliary Transformers

Description

On March 25, 2008, Unit 2 SAT 242-2 de-energized upon receipt of a C phase to ground relay actuation. As designed the upstream switchyard breakers opened de-energizing both SAT 242-1 and 242-2. Also as designed the downstream breakers opened resulting in a fast transfer of the 6.9KiloVoltage buses to the Unit Auxiliary Transformers and the transfer of the 4KiloVoltage buses to the emergency diesel generators which had automatically started. The licensee entered a Notification of Unusual Event and the NRC entered the Monitoring Mode. The licensee subsequently transferred the 4KiloVoltage loads to the Unit 1 SATs and began troubleshooting efforts. Following verification that a fault did not exist on the SAT 242-1 circuit all Unit 2 house loads were transferred to SAT 242-1. Subsequently the licensee exited the Unusual Event and the NRC exited the Monitoring Mode. The inspectors reviewed the plants and the operators responses to the loss of both unit SATs to determine if the responses were appropriate and in accordance with design, procedures and training. At the close of the inspection period additional information was required to determine if the loss of the SAT was a finding, or if it constituted a deviation or violation. The additional information needed was the results of the licensees root cause evaluation and proposed corrective actions. Based on the root cause of the fault a possible performance deficiency existed and the root cause analysis would assist the inspectors in making such a determination. Documents reviewed are listed in the Attachment. (URI 05000455/2008002-03

03
Site:	Byron
Report	IR 05000455/2008002 Section 4OA3
Date counted	Mar 31, 2008 (2008Q1)
Type:	URI:
cornerstone	No Cornerstone
Identified by:	NRC identified
Inspection Procedure:	IP 71153
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 Meghanir Ngc Thompson B Bartlett J Cassidy R Skokowski C Scott
INPO aspect
'
v • d • e

Finding - Byron - IR 05000455/2008002

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 05000455/2008002: 1 2 5 6 3 4

Finding List (Byron) @ 2008Q1

CCA Matrix: 2008Q1

	Q	CCA	Title
05000454/FIN-2007004-02	2007Q3	H.14	Inadequate Basis in 10 CFR 50.59 Evaluation Associated with a Special Test Procedure
05000454/FIN-2007009-02	2008Q1	H.14	Failure to Implement Timely Corrective Actions for Degraded Sx Riser Piping
05000454/FIN-2007009-03	2008Q1	H.2(a) H.6	Inadequate Design Margins for Continued Operation of Sx Riser Pipes
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-2007009-01	2008Q1	H.14	Operating Experience Procedure Not Followed for Service Water Corrosion Event
05000454/FIN-2008006-02	2008Q1		Inadequate Corrective Actions for Motor Operated Valve Breaker Magnetic Trip Settings
05000454/FIN-2008006-03	2008Q1	H.5	Unauthorized Transient Combustibles
05000455/FIN-2008002-03	2008Q1		Unit 2 Notice of Unusual Event Due to Loss of Both System Auxiliary Transformers
05000455/FIN-2008002-04	2008Q1		Unit 1 Train B Auxiliary Feedwater Pump Diesel Fire and Shutdown During Surveillance
05000454/FIN-2007009-04	2008Q1	H.14	Trm Change Bypasses Procedure Change and Safety Evaluation Processes
05000454/FIN-2007009-05	2008Q1	P.1 P.1(a)	Failure to Identify Corroded 0SX138B Valve Bolting During VT-2 Examination
05000454/FIN-2008002-01	2008Q1	H.2	Failure to Evaluate Radiological Hazards for Alpha Radiation
05000454/FIN-2008002-02	2008Q1	H.5	Plant Barrier Impairment Permit Not Followed

Self-Identified List (Byron)

	Q	Title
05000454/FIN-2008002-05	2008Q1	Licensee-Identified Violation
05000454/FIN-2008002-06	2008Q1	Licensee-Identified Violation

[Byron Findings full list]

@@ Line 1: / Line 1: @@
 {{finding
-| title = Unit 2 Notice Of Unusual Event Due To Loss Of Both System Auxiliary Transformers
+| title = Unit 2 Notice of Unusual Event Due to Loss of Both System Auxiliary Transformers
 | docket = 05000455
 | inspection report = IR 05000455/2008002
@@ Line 13: / Line 12: @@
 | identified by = NRC
 | Inspection procedure = IP 71153
-| Inspector = 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, Meghanir Ng, C Thompson, B Bartlett, J Cassidy, R Skokowski, C Scott
+| Inspector = 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 Meghanir,  Ngc Thompson, B Bartlett, J Cassidy, R Skokowski, C Scott
 | CCA = N/A for ROP
 | INPO aspect =

05000455/FIN-2008002-03: Difference between revisions

Latest revision as of 23:04, 29 May 2018

Navigation menu

05000455/FIN-2008002-03: Difference between revisions

Latest revision as of 23:04, 29 May 2018

Navigation menu

Search