05000282/FIN-2018011-01

Finding

Title

Failure to Justify Load Combinations Used in Main Steam Piping Stress Analysis

Description

Inspectors identified a Green finding and associated Non-Cited Violation of Title 10 of the Code of Federal Regulations, Part 50, Appendix B, Criterion III, Design Control, for the licensees failure to correctly translate provisions from specified quality standards for load combinations into piping analysis. Specifically, in the analysis for the Class I main steam piping, the licensee combined the seismic Operating Basis Earthquake and safety relief valve operating loads by Square Root of Sum of Squares. Prairie Island Updated Safety Analysis Report and the Engineering Manual for piping system stress analysis do not permit the Square Root of Sum of Squares method for combining these loads.

01
Site:	Prairie Island
Report	IR 05000282/2018011 Section 1R21
Date counted	Jun 30, 2018 (2018Q2)
Type:	NCV: Green
cornerstone	Mitigating Systems
Identified by:	NRC identified
Inspection Procedure:	IP 71111.21M
Inspectors (proximate)	A Dunlop J Benjamin V Meghani V Petrella S Kobylarz W Hopf J Corujo-Sandin M Jeffers K Takiyoshi K Yonebayashi
Violation of:	10 CFR 50 Appendix B 10 CFR 50 Appendix B Criterion III, Design Control
CCA	H.6, Design Margins
INPO aspect	WP.2
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v • d • e

Finding - Prairie Island - IR 05000282/2018011

1(2)2(1)3(4)4(0)5(0)6(0)11(2)301(0)411(2)412(0)503(0)301(0)

IR 05000282/2018011: 1 2

Finding List (Prairie Island) @ 2018Q2

CCA Matrix: 2018Q2

	Q	CCA	Title
05000282/FIN-2017003-01	2017Q3	P.3	Failure to Ensure Correct Operation of Meteorological Tower
05000306/FIN-2018001-01	2018Q1		Questions Regarding Corrective Action Program, Use of Operating Experience, and Qualification of the 21 125 VDC Battery due to Cell Lid Cracking
05000282/FIN-2018001-02	2018Q1		Questions Regarding the Corrective Action and Aging Management Programs Following the Discovery of 122 DDCLP FOST Vent Piping Degradation
05000282/FIN-2018011-01	2018Q2	H.6	Failure to Justify Load Combinations Used in Main Steam Piping Stress Analysis
05000282/FIN-2018011-02	2018Q2		Potential Failure to Protect Class I Structures, Systems,and Components from Tornado Generated Missiles
05000282/FIN-2018002-01	2018Q2		Results of ISFSICask Array Dose Calculation Not Incorporated into FSAR

Self-Identified List (Prairie Island)

	Q	Title
05000282/FIN-2017003-02	2017Q3	Licensee-Identified Violation
05000282/FIN-2017003-03	2017Q3	Licensee-Identified Violation
05000282/FIN-2017003-04	2017Q3	Licensee-Identified Violation
05000282/FIN-2017004-04	2017Q4	Licensee-Identified Violation
05000282/FIN-2017004-03	2017Q4	Licensee-Identified Violation
05000282/FIN-2017004-02	2017Q4	Licensee-Identified Violation
05000282/FIN-2017004-01	2017Q4	Licensee-Identified Violation

[Prairie Island Findings full list]

05000282/FIN-2018011-01

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