05000289/FIN-2018012-01

Finding

Title

Failure to Establish Appropriate Corrective ActionsAssociated with a Degraded Non-Safety Related Piping System.

Description

The NRC identified a Green finding when Exelon failed to establish appropriate corrective actions for a non-safety related system in the vicinity of safety-related equipment from 2010 to 2018. Specifically, failure to fix non-safety related piping resulted in its failure and water intrusion into the ESAS cabinets. This resulted in an event that required extensive clean up and detailed inspection of several Emergency Safeguards Actuation System (ESAS) cabinets due to water intrusion from the non-safety related system.

01
Site:	Three Mile Island
Report	IR 05000289/2018012 Section 4OA2
Date counted	Jun 30, 2018 (2018Q2)
Type:	Finding: Green
cornerstone	Initiating Events
Identified by:	NRC identified
Inspection Procedure:	IP 71152
Inspectors (proximate)	T Setzer C Hobbs B Lin R Vadella M Young
CCA	P.2, Evaluation
INPO aspect	PI.2
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v • d • e

Finding - Three Mile Island - IR 05000289/2018012

1(3)2(0)3(2)4(0)5(0)6(0)10(0)201(0)410(1)11(0)

IR 05000289/2018012: 1

Finding List (Three Mile Island) @ 2018Q2

CCA Matrix: 2018Q2

	Q	CCA	Title
05000289/FIN-2017403-01	2017Q3		Security
05000289/FIN-2017403-03	2017Q3	H.8	Security
05000289/FIN-2017004-01	2017Q4	P.2	Failure to correct degraded control rod connections
05000289/FIN-2018001-01	2018Q1		Enforcement Action (EA)-EA-18-029: Multiple Examples of Nonconforming to Design for Tornado Missile Protection
05000289/FIN-2018001-02	2018Q1		Enforcement Action (EA)-18-038: Primary Containment Declared Inoperable Due to Both Airlock Doors Open Simultaneously
05000289/FIN-2018012-01	2018Q2	P.2	Failure to Establish Appropriate Corrective ActionsAssociated with a Degraded Non-Safety Related Piping System.

Self-Identified List (Three Mile Island)

	Q	Title
05000289/FIN-2017403-02	2017Q3	Security
05000289/FIN-2017003-01	2017Q3	Licensee-Identified Violation
05000289/FIN-2018001-03	2018Q1	Licensee-Identified Violation

[Three Mile Island Findings full list]

05000289/FIN-2018012-01

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