05000237/FIN-2011008-07

Finding

Title

Licensee-Identified Violation

Description

In April 2011 the licensee determined that several paths existed, in addition to previously evaluated condensate storage tank (CST) to hotwell make-up valve path, which could cause gravity drain of the CST to the hotwell due to multiple spurious operations. As a result, the licensee determined that a review and circuit analysis of other CST and clean demineralizer paths needed to be performed. The licensee initiated a circuit analysis review, which was still in progress at the time of this inspection, to more fully address potential CST drain down scenarios. Based on the inspectors review, it was determined that the above non-compliance for an MSO (Scenario 2aj, Loss of CST Inventory to Hot Well, of NEI 00-01, Table G-1, BWR Generic MSO List) was a violation of 10 CFR Part 50, Appendix R, Section III.G. The inspectors determined that the licensees existing procedures already addressed the more significant potential drain down path event involving spurious opening of CST to hotwell make-up valves and that a drain down event would occur over a relatively long period of time, providing operators an opportunity to intervene. Therefore, inspectors assigned a low degradation to this finding and determined that it screened as having very low safety significance (Green). The licensee initiated ARs 01257847, FP Triennial: MSO Scenario Did Not Have IR, and 01257854, MSOPS 2aj: CST Drain Down, to add Scenario 2aj to the corrective action program.

07
Site:	Dresden
Report	IR 05000237/2011008 Section 4OA7
Date counted	Dec 31, 2011 (2011Q4)
Type:	NCV: Green
cornerstone	Mitigating Systems
Identified by:	Licensee-identified
Inspection Procedure:
Inspectors (proximate)	Z Falevits R Daley R Langstaff R Winter J Bowen S Belding
INPO aspect
'
v • d • e

Finding - Dresden - IR 05000237/2011008

1(0)2(7)3(9)4(5)5(3)6(0)7(0)8(8)9(0)301(0)403(2)404(0)405(0)406(0)501(0)502(0)22(0)

IR 05000237/2011008: 1 2 3 4 5 6 7 1

Finding List (Dresden) @ 2011Q4

CCA Matrix: 2011Q4

	Q	CCA	Title
05000237/FIN-2011403-01	2011Q1	H.2	Security
05000237/FIN-2011002-02	2011Q1	H.5	Control Room Ventilation Smoke Detector Failure to Perform Post-Maintenance Testing
05000237/FIN-2011002-04	2011Q1	H.5	Failure to Perform Surveillance Testing on East Turbine Building Vent HVAC Smoke Detectors
05000237/FIN-2011002-05	2011Q1		Undocumented Technical Basis for Change to EOP ATWS Mitigation Strategy
05000237/FIN-2011002-06	2011Q1	H.2	Failure to Follow TS 5.5.2 Implementing Procedures
05000237/FIN-2011002-07	2011Q1	H.11 H.12	Dresden 3B Circulating Water Pump Bearing Failure Due to Low Oil Level
05000237/FIN-2011002-03	2011Q1		Adequacy of Control Room Ventilation Smoke Purge Function
05000237/FIN-2011002-01	2011Q1		Satisfactory Performance of a Surveillance Test Procedure That Was Later Demonstrated to be Not Capable of Being Performed
05000237/FIN-2011003-04	2011Q2		Inadequate Instructions for Coping with a Dresden Lock and Dam Failure
05000237/FIN-2011003-06	2011Q2		Concerns with the Licensing and Design Basis
05000237/FIN-2011003-01	2011Q2		Failure to Include Adequate Acceptance Criteria in a Surveillance Test
05000237/FIN-2010502-01	2011Q2		(Traditional Enforcement) Changes to EAL Basis Decreased the Effectiveness of the Plan without Prior NRC Approval
05000237/FIN-2011003-08	2011Q2	P.2	Failure to Place One Channel of the Rod Block Monitor Into Trip
05000237/FIN-2011003-07	2011Q2	H.12	Change In Unit 2 Reactor Water Level Due To A Failure To Follow Procedure
05000237/FIN-2011003-05	2011Q2		Inadequate Scoping of a Non-Safety-related Pump Into Maintenance Rule
05000237/FIN-2011003-03	2011Q2		Inadequate Acceptance Criteria for Testing Equipment Relied Upon to Mitigate the Consequences of a Lock and Dam Failure
05000237/FIN-2011003-02	2011Q2		Inadequate Instructions for the Inspection of Safety-Related Portions of the Intake Structure
05000237/FIN-2010502-02	2011Q2		Changes to EAL Basis Decreased the Effectiveness of the Plan without Prior NRC Approval
05000237/FIN-2011004-04	2011Q3		Inadequate Preventive Maintenance Procedure For Valve 2-2301-29
05000237/FIN-2011004-01	2011Q3		Classification of the Emergency Diesel-Driven Flood Pump to Required Quality Standards
05000237/FIN-2011004-05	2011Q3		Alert Declared Due to Chemical Spill
05000237/FIN-2011004-03	2011Q3		Inadequate Relay Preventative Maintenance
05000237/FIN-2011004-02	2011Q3		Improperly Classifying the Unit 2 and 3 Containment Cooling Service Water (CCSW) Pump Vault Drain Check-Valves as Non-Safety-Related
05000237/FIN-2011008-03	2011Q4		Failure to Ensure Operators Required for Safe Shutdown Were On-Site
05000237/FIN-2011008-06	2011Q4		Failure to Obtain NRC Approval for Change Adverse to Safe Shutdown
05000237/FIN-2011008-02	2011Q4	H.9	Failure to Identify Diesel Fire Pump Battery Terminal Corrosion
05000237/FIN-2011008-04	2011Q4		Safe Shutdown Procedure Implementation
05000237/FIN-2011008-01	2011Q4	H.10	Failure to Implement Transient Combustible Program
05000237/FIN-2011005-02	2011Q4	H.2	Control Rod Blade Disengages from Lifting Tool and Drops Over Reactor Core into an Empty Cell
05000237/FIN-2011005-01	2011Q4	H.12	Bus 23 Pot Fuse Drawer Resulting in the Inoperability of the Control Room Emergency Ventilation Air Condition System
05000237/FIN-2011005-03	2011Q4		Unplanned Unit 2 Secondary Containment TS Entry
05000237/FIN-2011008-05	2011Q4		Failure to Obtain NRC Approval for Change Adverse to Safe Shutdown

Self-Identified List (Dresden)

	Q	Title
05000237/FIN-2011403-02	2011Q1	Security
05000237/FIN-2011003-09	2011Q2	Licensee-Identified Violation
05000237/FIN-2011008-07	2011Q4	Licensee-Identified Violation

[Dresden Findings full list]

05000237/FIN-2011008-07

Navigation menu

Search