ML15118A804

Webinar 2015 Slides Presentation

ML15118A804
Person / Time
Site:	Oyster Creek
Issue date:	05/05/2015
From:	Division Reactor Projects I
To:	AmerGen Energy Co
KENNEDY, SR
Shared Package
ML15118A795	List: ML15118A804 ML15125A026
References
Download: ML15118A804 (23)

Text

Welcome!

This webinar will start in a few moments Nuclear Regulatory Commission - Region I 1

Todays Presenters Ho Nieh Director, Division of Reactor Projects Silas Kennedy Branch Chief, Division of Reactor Projects Niklas Floyd Reactor Inspector, Division of Reactor Safety Amar Patel Senior Resident Inspector Inspector, Oyster Creek Brett Klukan Regional Counsel (Moderator) 2

2014 Performance Results Inspection Activities at Oyster Creek in 2014 Discussion of Greater than Green Findings Question-and-Answer Session Closing g Remarks g

Agenda 3

Exelon operated Oyster Creek safely and in a manner that p preserved the p public health and safety y

and protected the environment.

2014 Annual Assessment Summary y 4

Action Matrix Multiple/Repetitive Licensee Regulatory Degraded Unacceptable Degraded Response Response Cornerstone Performance Cornerstone IIncreasing:

i

• Safety Significance

• Inspection

• Management Involvement

• Regulatory Action Assessment Summary (cont.):

Oyster O t Creek C k is i iin th the Regulatory R l t R

Response

Column of the NRCs Reactor Oversight Process Action Matrix 5

Assessment Summary (cont.):

Action Matrix:

Regulatory Response Column Inspection Findings Performance Indicators

• One White finding: #2 emergency

• One White performance indicator:

diesel generator fan shaft failure unplanned scrams (3Q2014)

• One Yellow finding: electromatic

• Returned to Green in 4Q2014 and relief valve failures (old design satisfactory follow-up follow up inspection issue - no Action Matrix input) (95001)

• Nine Green findings in 2014

• All performance indicators are currently Green Green White Yellow Red Increasing Safety Significance 6

6900 hours0.0799 days <br />1.917 hours <br />0.0114 weeks <br />0.00263 months <br /> of inspection and related activities 2 Resident Inspectors on site - residents issue four quarterly inspection reports per year and walk through the plant every day NRC C Inspection spect o Activities ct t es at Oyster Oyste Creek C ee in 2014 0

7

14 regional g inspections p

2 major team inspections Fire Protection Problem Identification and Resolution Follow-up inspection (95001) for a White unplanned scrams performance indicator NRC C Inspection spect o Activities ct t es at Oyster Oyste Creek C ee in 2014 0

8

No. 2 Emergency Diesel Generator Fan Shaft Failure Electromatic Relief Valve (EMRV) Failures Greater-than-Green Findingsg 9

No. 2 Emergency Diesel Generator Fan Shaft Failure White violation of 10 CFR 50, Appendix B, Criterion III III, Design Design Control Control Exelon did not review the suitability of a new maintenance process for tensioning the cooling fan belt for the diesel generators.

This resulted in the shaft being more susceptible to fatigue and subsequent failure.

Diesel Generator 10

No. 2 Emergency Diesel Generator Fan Shaft Failure (cont (cont.))

Exelon Exelonss corrective actions included:

Replacing the fan shaft for No. 2 emergency diesel generator g

Checking for a similar problem in the identical No.1 emergency diesel generator Revising the maintenance procedure 11

No. 2 Emergency Diesel Generator Fan Shaft Failure (cont (cont.))

Background on the Issue NRC IInspection ti R Reportt 05000219/2014005 (F (February b

11, 2015)

ADAMS Accession Number: ML15042A072 Date of follow-up supplemental inspection (95001): TBD Action Matrix Input Degraded Multiple/Repetitive Degraded Unacceptable Licensee Response Regulatory Response Cornerstone Cornerstone Performance White violation for emergency Follow-up Follow up inspection (95001) di diesel l generator t

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Electromatic Relief Valve (EMRV)

Failures Yellow violation of 10 CFR 50, Appendix B, Criterion III, Design Control Old design issue per Inspection Manual Chapter (IMC) 0305 The original design of the EMRV actuators was inadequate because portions of the actuator could bind when subject to vibration associated with plant operation.

Green White Yellow Red Increasing Safety Significance 13

Electromatic Relief Valve (EMRV)

Failures (cont (cont.))

EMRV actuator design 14

Electromatic Relief Valve (EMRV)

Failures (cont.)

Exelons corrective actions included:

Performing a reactor shutdown and containment entry to test the currently installed EMRVs EMRVs. All five EMRVs stroked successfully 15

Electromatic Relief Valve (EMRV)

Failures (cont.)

Corrective actions (cont.):

Replacing all five EMRV actuators with redesigned actuators during the refueling outage g in October 2014 Revising applicable maintenance procedures 16

Why is this an Old Design Issue?

Identified by Exelon through voluntary as-found bench testing of EMRV actuators Exelon replaced all of the actuators with redesigned actuators, and revised applicable maintenance procedures 17

Why is this an Old Design Issue (cont.)?

Not likely to be previously identified by recent ongoing licensee efforts Not a current performance deficiency associated with existing Exelon programs, policy, or procedure 18

What will the NRC do with this Old Design Issue?

No input into the NRC Action Matrix (i.e., no column changes)

Our process (IMC 0305) still requires performance of a follow-up (supplemental) inspection to review Exelons root cause evaluation and corrective actions for this issue.

Because this issue is Yellow Yellow, the NRC will perform supplemental inspection procedure 95002 (date TBD)

Action Matrix Input Degraded Multiple/Repetitive Degraded Unacceptable Licensee Response Regulatory Response Cornerstone Cornerstone Performance White violation for emergency Follow-up inspection (95001) diesel generator No Action Matrix Input Yellow violation/old design Follow-up inspection (95002) issue for EMRVs 19

Electromatic Relief Valve (EMRV) Failures (cont.)

Background on the Issue NRC Inspection Report 05000219/2014009 (February 11, 11 2015)

ADAMS Accession Number: ML15042A231 Date of follow-up supplemental inspection (95002): TBD 20

21 22 Do you have feedback on this webinar for us?

Go to the public meeting schedule on our website (http://meetings.nrc.gov/pmns/mtg), click on the [more] link f this for thi specific ifi meeting ti andd th then click li k on th the M Meeting ti Feedback link. Or E-mail comments to Silas Kennedy at silas.kennedy@nrc.gov