ML13010A282

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January 12, 2013 Webinar Presentation Slides
ML13010A282
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Site: Palisades Entergy icon.png
Issue date: 01/10/2013
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NRC/RGN-III
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Download: ML13010A282 (31)
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NRC Public Webinar NRCs Perspectives on Leaks January 12, 2013 1

Welcome Cynthia Pederson Deputy Regional Administrator NRC Region R i III 2

Introductions - NRC

  • Cynthia Pederson, Deputy Regional Administrator, Region III
  • Elba Sánchez-Santiago, Reactor Inspector RIII (Presenter)

Inspector,

Meeting g Agenda g

  • Meeting Purpose
  • Classifications

-Examples

  • Q&A Session
  • Closing Remarks 4

Meeting Purpose

  • Provide a perspective on leaks and how they are regulated by the NRC.
  • Provide examples of leaks that have occurred at Palisades and actions taken to address these leaks.
  • Answer questions from the public.

5

What is a leak?

  • A leak is generally an opening in a pipe a component or a structure pipe, from which a fluid escapes.

- Examples:

E l

  • Metallic portion of a component (Through-Wall))

6

Leaks Covered by NRC Regulations

  • Leaks from safety related piping and components.

components

  • Leaks that have an impact on safety related components.

- For example, a leak from a non safety related system that falls onto a safety related component.

  • L Leaksk ffrom components important i to safety. (e.g. Fire Protection) 7

Leaks Not Covered by NRC Regulations

  • Leaks that have no impact on safety-related equipment equipment.

8

Through-Wall Leaks

  • Through-wall leaks originate from a crack or material loss that goes all the way through the wall of the pipe or component.
  • All through through-wall wall leaks that are in safety related components are required to be repaired.
  • The actions taken and the timeliness are dependant on the safety significance (component class).

9

Classifications

  • Safety Related systems are divided into three American Society of Mechanical Engineers (ASME) Code categories (Class 11, Class 22, or Class 3) 3).
  • The system Code Class is determined by application of a methodology endorsed by the NRC (Regulatory Guides and the Code of Federal Regulations).

10

Class 1 Systems

  • Are safety related systems.

( CS)

  • It includes all RCS connections up to the outermost containment isolation valve.

11

Class 1 Systems

  • Repair Requirements

- Must be repaired immediately after discovery.

- No RCS Pressure Boundary g p Leakage permitted.

12

Control Rod Drive Housing Leak -

Palisades Example p

13

Control Rod Drive Housing Leak - Palisades 14

Control Rod Drive Housing Leak -

Palisades

- Through-wall leak in control rod drive housing #24 found on August 12 12.

  • The housing is part of the primary coolant system boundary.
  • Area is not allowed ANY leakage per Technical Specifications.

q

  • Required repair p p prior to start-up.

p 15

Class 2 Systems

  • Are safety related systems.
  • Typically systems that are relied upon directly to mitigate an accident.

16

Class 2 Systems

  • Repair Requirements

- Leakage must be evaluated to determine the effect on the system.

- The repair may occur at a later time dependent on the results of the evaluation which must follow an NRC approved method.

17

Main Steam Leak -

Palisades Example Steam Leak 18

Main Steam Leak - Palisades Example

  • Small un-isolable through-wall steam leak.

leak

  • Technical Specifications required a plant shut down.
  • Repair was required prior to start-up (November 2012).

19

Safety Injection Refueling Water Storage Tank (SIRWT) - Palisades C t Catacombsb

  • Image for demonstration purposes only 20

Safety Injection Refueling Water g Tank (SIRWT)

Storage ( ) Area - Palisades

  • Tanks structure was determined to be sound based on an NRC accepted methodology.
  • Confirmatory action letter (CAL) was issued to Palisades in order to track their commitments.

21

Class 3 Systems

  • Are safety related systems.
  • Generally consist of cooling water systems that support the reactor shutdown function.

f

Class 3 Systems

  • Repair Requirements:

- Similar to Class 2, leakage must be evaluated to determine the effect on the system.

system

- The repair may occur at a later time dependent on the results of the evaluation which must follow an NRC approved method.

23

Service Water Leak -

Palisades Example 24

Service Water Leak - Palisades

  • The NRC resident inspector discovered water leaking from a service water valve valve.
  • The leak rate was about 11/2 cups per hour and did not affect system functions functions.
  • NRC inspectors monitored the leak on a daily basis.
  • The valve was repaired in November 2012 25

Summary of Through Wall Leaks

  • Repair requirements depend on the component Code Class and/or evaluation results.

26

Conclusion

  • Palisades is operating safely.
  • The NRC has noted a number of technical issues for which initial NRC review identified f no immediate safety f

concerns.

  • Proper maintenance of the facility is necessary to ensure safe plant operation.

27

Conclusion

  • NRC continues to monitor licensees activities related to leaks to ensure that regulatory requirements are met.

28

Questions 29

M ti Closure Meeting Cl Cynthia Pederson Deputy Regional Administrator NRC Region R i III 30

Meeting g Contacts

  • Followup Questions - Contact the NRC Region III Offi off Public Office P bli Affairs Aff i Viktoria Mitlyng / Prema Chandrathil T l (630) 829 Tel: 829-9500 9500 OPA3@nrc.gov 31
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