05000361/FIN-2008010-01: Difference between revisions

Finding

Title

Inadequate Design Control for Design Basis of Ccw/Cwc Heat Exchangers

Description

The team identified a noncited violation of 10 CFR 50, Appendix B, Criterion III, Design Control, for failure to ensure that plant conditions were consistent with design calculation inputs and assumptions (rate of established component cooling water heat exchanger tube plugging). Specifically, there were no procedures to verify that the periodic heat treatments of the intake tunnel and intake structure were effective and that the population of shells available for plugging the component cooling water heat exchangers was consistent with the historical data used to develop the engineering calculation and operating instruction curves. As a result, the design basis calculation and operating instructions did not ensure the capability of the heat exchangers to perform their design function during anomalous conditions. The licensee has entered this into their corrective action program as Notification NN 200006369. This finding is more than minor in that the performance of the component cooling water heat exchangers is essential in protecting the mitigating systems cornerstone objective (design control and equipment performance attributes) of ensuring the availability, reliability, and capability of systems needed to mitigate the consequences of an accident. Specifically, the existing design analyses did not adequately demonstrate that the component cooling water heat exchangers would perform adequately in the event of anomalous tube plugging events and plant procedures did not ensure that these anomalous events would be detected and mitigated prior to the heat exchangers being plugged. These deficiencies represented reasonable doubt regarding the operability of the component cooling water heat exchangers. Using the Inspection Manual Chapter 0609, Significance Determination Process, Phase 1 Worksheets, the finding is determined to have very low safety significance (Green) because the deficiency did not result in a loss of safety function of component cooling water Train A for greater than the Technical Specification allowed outage time. Train B was not adversely affected by this event. This finding was reviewed for cross-cutting aspects and none were identified since the performance deficiency is long standing and is not indicative of current licensee performanc

01
Site:	San Onofre
Report	IR 05000361/2008010 Section 1R21
Date counted	Sep 30, 2008 (2008Q3)
Type:	NCV: Green
cornerstone	Mitigating Systems
Identified by:	NRC identified
Inspection Procedure:	IP 71111.21
Inspectors (proximate)	L Ellershaw J Adams C Baron G Skinner P Gage R Bywater M Bloodgood D Reinert
INPO aspect
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Finding - San Onofre - IR 05000361/2008010

9(0)14(0)16(0)1(0)2(2)3(7)4(1)5(5)6(0)7(0)10(7)11(0)12(0)13(3)15(1)301(0)401(0)402(0)501(0)14(0)

IR 05000361/2008010: 1 2 3 4 5 6 7

Finding List (San Onofre) @ 2008Q3

CCA Matrix: 2008Q3

	Q	CCA	Title
05000361/FIN-2008002-01	2008Q1	H.11 H.12	Unit 2 Main Feedwater Pump Trip Results in Inadvertent Power Reduction
05000361/FIN-2008003-07	2008Q2		Exercise of Enforcement Discretion for Willful Violation of Radiation Exposure Permit Instructions (EA 08-055)
05000361/FIN-2008003-01	2008Q2	P.2	Air Supply Equalizing Valve Not Secured Closed Due to Failure to Follow Procedures
05000361/FIN-2008003-04	2008Q2	H.13	Failure to Properly Implement the Operability Determination Process
05000361/FIN-2008003-05	2008Q2	H.7	CCW heat exchanger not operable due to Inadequate Maintenance Procedure
05000361/FIN-2008003-02	2008Q2	H.5	Pressurizer Pressure Transient due to Inadequate Maintenance Procedure
05000361/FIN-2008003-03	2008Q2	H.11 H.12	Failure to Properly Monitor and Execute a Unit 2 Reactivity Manipulation
05000361/FIN-2008003-06	2008Q2	H.2	Failure to Implement Procedural Requirements for Planned Unit 2 Power Reduction
05000361/FIN-2008010-03	2008Q3		Omission of Station Blackout Profile During Battery Service Tests
05000361/FIN-2008004-01	2008Q3	H.12	Failure to Follow Procedure to Move Nuclear Fuel in the Spent Fuel Pool
05000361/FIN-2008010-07	2008Q3	P.2	Inadequate Corrective Actions for Reactivity Events
05000361/FIN-2008010-01	2008Q3		Inadequate Design Control for Design Basis of Ccw/Cwc Heat Exchangers
05000361/FIN-2008010-02	2008Q3		Inadequate Design Control for 125VDC Control Circuits
05000361/FIN-2008010-04	2008Q3		Inadequate Corrective Actions for Battery Performance Test Issues
05000361/FIN-2008010-05	2008Q3	H.12	Failure to Follow Procedures During the Battery Performance Tests
05000361/FIN-2008010-06	2008Q3		Inadequate Procedures for 480 Vac System Grounds

Self-Identified List (San Onofre)

	Q	Title
05000361/FIN-2008002-02	2008Q1	Licensee-Identified Violation
05000361/FIN-2008015-01	2008Q3	Licensee-Identified Violation

[San Onofre Findings full list]

@@ Line 1: / Line 1: @@
 {{finding
-| title = Inadequate Design Control For Design Basis Of Ccw/Cwc Heat Exchangers
+| title = Inadequate Design Control for Design Basis of Ccw/Cwc Heat Exchangers
 | docket = 05000361, 05000362
 | inspection report = IR 05000361/2008010

05000361/FIN-2008010-01: Difference between revisions

Latest revision as of 23:06, 29 May 2018

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05000361/FIN-2008010-01: Difference between revisions

Latest revision as of 23:06, 29 May 2018

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