05000387/FIN-2012005-04: Difference between revisions

Finding

Title

Improper Stress Intensification Factor Results in RCS Pressure Boundary Leak

Description

A self-revealing Green NCV of 10 CFR 50 Appendix B, Criteria III, Design Control, was identified related to a leak on the Unit 1 A reactor recirculation pump suction line decontamination flange weld. Specifically, PPL personnel used an incorrect value for stress intensification factor in the vibration analysis in 2004 to support an extended power uprate (EPU). When the correct stress intensification factor was applied, American Society of Mechanical Engineers (ASME) OM-3 code limits for endurance and fatigue stress were exceeded. The weld failure resulted in pressure boundary leakage in excess of TS 3.4.4 limits from approximately June 16 through 19, 2012. PPL staff entered the problem in the PPL corrective action program (CAP) as CR 1589390, repaired and modified the flange line, and revised the calculation. The inspectors reviewed the performance deficiency using NRC IMC 0612, Appendix B, Issue Screening, and determined to be more than minor because it affected the Initiating Events cornerstone attribute of design control. The issue adversely affected the associated cornerstone objective of limiting the likelihood of those events that upset plant stability and challenge critical safety functions during shutdown as well as power operations. The finding was evaluated using Section A of IMC 609, Appendix A, Exhibit 1, Initiating Events Screening Questions. Since the finding result could not have reasonably exceeded the leak rate for a small loss of coolant accident (LOCA) and did not likely affect other systems used to mitigate a LOCA resulting in a total loss of their function (e.g., inter-facing system LOCA), the finding screened to very low safety significance (Green). This finding was determined to not be indicative of current performance because the deficiency occurred in 2004 and procedures and training are in place that would have precluded the issue. Therefore, no cross-cutting aspect is assigned.

04
Site:	Susquehanna
Report	IR 05000387/2012005 Section 4OA2
Date counted	Dec 31, 2012 (2012Q4)
Type:	NCV: Green
cornerstone	Initiating Events
Identified by:	Self-revealing
Inspection Procedure:	IP 71152
Inspectors (proximate)	A Bolger A Rosebrook C Lally J Caruso J Furia J Greives J Richmond M Gray P Finney R Edwards R Rolph
INPO aspect
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v • d • e

Finding - Susquehanna - IR 05000387/2012005

1(0)2(7)3(5)4(4)5(6)6(0)7(1)8(1)9(3)11(0)201(0)301(0)403(0)404(2)405(0)501(0)1(0)8(0)

IR 05000387/2012005: 1 2 3 4 5 6

Finding List (Susquehanna) @ 2012Q4

CCA Matrix: 2012Q4

	Q	CCA	Title
05000387/FIN-2012008-01	2012Q1	H.5	Inadequate Gain Settings Result in Reactor Scram
05000387/FIN-2012002-03	2012Q1		Installed Instrumentation Necessary for EAL Declaration
05000387/FIN-2012002-01	2012Q1	P.1	Inadequate MOV Program Implementation
05000387/FIN-2012002-02	2012Q1	P.2	Inadequate Instrumentation to Implement EALs for Unplanned Radiological Effluent Release
05000387/FIN-2012002-04	2012Q1	H.12	Noncompliance with Radiological Barrier
05000387/FIN-2012002-05	2012Q1	H.8	Failure to Follow Radiation Protection Procedures
05000387/FIN-2012003-03	2012Q2		VIOLATION OF 10 CFR 50.73(a)(2)(i)(B), FAILURE TO REPORT CONDITION PROHIBITED BY TSs
05000387/FIN-2012404-01	2012Q2	P.5	Security
05000387/FIN-2012003-05	2012Q2	H.5	Failure to Follow Radiation Protection Procedures
05000387/FIN-2012003-04	2012Q2	H.5	Improperly Performed Maintenance Impacts Secondary Containment
05000387/FIN-2012003-02	2012Q2	H.7	Failure to Correct MSIV Seat Leakage
05000387/FIN-2012003-01	2012Q2	H.14	Failure to Prevent Recurrence of Secondary Containment Bypass Leakage Significant Condition Adverse to Quality
05000387/FIN-2012404-02	2012Q2	H.7	Security
05000387/FIN-2012004-02	2012Q3	H.13	Inadequate Troubleshooting Results in Loss of Secondary Containment and Protected Equipment
05000387/FIN-2012009-03	2012Q3	P.3	Failure to Identify and Correct a CAQ Associated with Reactor Recirculation Valve Exercising Surveillance Procedure
05000387/FIN-2012009-02	2012Q3	P.2	Failure to Identify and Correct a CAQ Associated with a SAFETY-RELATED Battery Maintenance Procedure
05000387/FIN-2012009-01	2012Q3	H.8	Inadequate Compensatory Actions for Inadequate MOV Grease Analysis Procedures
05000387/FIN-2012004-03	2012Q3	H.5	Failure to Implement Risk Management Actions
05000387/FIN-2012004-01	2012Q3	P.1	Inadequate Procedure for Acts of Nature
05000387/FIN-2012005-04	2012Q4		Improper Stress Intensification Factor Results in RCS Pressure Boundary Leak
05000387/FIN-2012005-03	2012Q4	P.1	Failure of FULL-SCALE Drill Critique to Identify an RSPS Weakness
05000387/FIN-2012005-01	2012Q4	P.2	FAILURE TO DEMONSTRATE EFFECTIVE PREVENTIVE MAINTENANCE UNDER 50.65(a)(2)
05000387/FIN-2012005-06	2012Q4		Failure to Make a Timely Report for a Valid Actuation of RPS
05000387/FIN-2012007-01	2012Q4		Adequacy of Secondary Containment and Standby Gas Treatment System Testing
05000387/FIN-2012005-02	2012Q4		Failure to Report COMMON-CAUSE Inoperability of Independent Trains
05000387/FIN-2012005-05	2012Q4		Concerns Regarding Ppls Program for Conducting Biennial Medical Examinations for Licensed Operators and Reporting Changes in Medical Conditions

Self-Identified List (Susquehanna)

	Q	Title
05000387/FIN-2012002-06	2012Q1	Licensee-Identified Violation
05000387/FIN-2012002-07	2012Q1	Licensee-Identified Violation
05000387/FIN-2012004-04	2012Q3	Licensee-Identified Violation

[Susquehanna Findings full list]

@@ Line 1: / Line 1: @@
 {{finding
-| title = Improper Stress Intensification Factor Results In Rcs Pressure Boundary Leak
+| title = Improper Stress Intensification Factor Results in RCS Pressure Boundary Leak
 | docket = 05000387, 05000388
 | inspection report = IR 05000387/2012005

05000387/FIN-2012005-04: Difference between revisions

Latest revision as of 19:46, 20 February 2018

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05000387/FIN-2012005-04: Difference between revisions

Latest revision as of 19:46, 20 February 2018

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