ML022690267

Meeting Handouts to Discuss Kaowool Issues

ML022690267
Person / Time
Site:	Farley
Issue date:	09/25/2002
From:	Rinaldi F NRC/NRR/DLPM/LPD2
To:
References
Download: ML022690267 (7)

Text

NRC FORM 658 U.S. NUCLEAR REGULATORY COMMISSION (9-19~99 TRANSMITTAL OF MEETING HANDOUT MATERIALS FOR IMMEDIATE PLACEMENT IN THE PUBLIC DOMAIN This form is to be filled out (typed orhand-printed)by the person who announced the meeting (i.e., the person who issued the meeting notice). The completed fohmin and the attachedcopy of meeting handout materials, will be sent to the Document ControlDesk on the same day of the meeting; underno circumstances will this be done later than the working day after the meeting.

Do not include proprietarymaterials.

DATE OF MEETING The attached document(s), which was/were handed out in this meeting, is/are to be placed 09/25/2002 in the public domain as soon as possible. The minutes of the meeting will be issued in the near future. Following are administrative details regarding this meeting:

Docket Number(s) 50-348 AND 50-364 Plant/Facility Name FARLEY, UNITS 1 AND 2 TAC Number(s) (if available)

Reference Meeting Notice AUGUST 19,2002 Purpose of Meeting (copy from meeting notice) TO DISCUSS KAOWOOL ISSUES NAME OF PERSON WHO ISSUED MEETING NOTICE TITLE F. RINALDI JPROJECT MANAGER OFFICE NRR DIVISION DLPM BRANCH PD 11-1 Distribution of this form and attachments:

Docket File/Central File PUBLIC NRC FORM 658 (9-1999) PRINTED ON RECYCLED PAPER Tirls form was designed using inF-orms

Raceway Fire Barrier Resolution Project Farley Nuclear Plant

' Project Status

• ,September 25, 2002

__SOUTHERNA COMPANY AGENDA

- Kaowool Recap I~ - Current Resolution Status I* - Risk Informed / Performance Based - Fire Modeling of SWIS

-I, 1

Kaowool Recap FNP selected and installed Kaowool to meet original raceway fire protection requirements BTP APCSB 9.5-1 (late 70's)

FNP requested and was granted specific Appendix R exemptions to 1 hr fire barrier requirements based on Kaowool use. (mid 80s)

NRC questioned technical basis of exemptions and acknowledges their approval but no longer understands the basis for granting (1999)

SNC commits to address NRC concerns (2000) i Current Resolution Status 19 Fire Areas Affected Preferred Solutions are:

Reroute Cable Install Fire Rated cables Installation of Local Indication Add controls to Hot Shutdown Panel Enhance operator actions Service Water Intake Structure Fire Modeling Administrative Controls J Upgraded Fire Barrier Walls L Exemptions 2

Current Resolution Status

- 30 to 35 Design Change Packages will be developed

- 5 DCP's have been issued. One is complete; several are being worked during the current Unit 2 outage.

• Our Plan is to be complete with all modifications by end of year 2005.

Project Timeline Project Timeline W r ee 2We are here!

2000 - The Study Year/

• Develop potential resolution and develop recommended resolution plan outageImplementation and non-outageYears mods S

S

/

S200213/415-

.Both to be conducted each year.

S ItJ S S

S

i. S S

S S

S 2001 - DCP Development Year 2006 - The Clean Up Year

° Obtain management

- Complete 'left-over work concurrence and begin design work for DCPs, begin exemption 'reconstitution.'

3

Risk Informed / Performance Based Modeling at the SWIS SWIS houses the service water pumps (ultimate heat sink)

IAz Modeling at the SWIS

-Approximately 1350 feet of Appendix R Kaowool

- Rerouting is not feasible

-Removal of current wrap may involve complex "personnelprotection requirements I *Rewrapping cable with new wrap does not provide significant safety improvement 4

Modeling at the SWIS

-SNC has conducted a pilot study of a risk informed / performance based fire model at the SWIS

-Pilot performed by outside consultants and follows the guidelines of NFPA 805

-Model Results:

Afire of sufficient magnitude to cause loss of function of redundant trains of cables is extremely unlikely Much better improvement in CDF/LERF is achieved by other modifications than re-wrapping cable trays Modeling at the SWIS Modeling of SWIS has shown that other modifications do provide a safety improvement

-Isolation of a DG Control Circuit

-Elimination of the need for Unit 2 service A water booster pumps by modification of service water pump seals

-Enhancement of the swing pump fire barrier to prevent spreading fire from one train to another.

5

Conclusions SNC is on schedule to complete all Kaowool fire barrier work by end of 2005.

This date is contingent on the acceptance of fire modeling for the SWIS Pilot Fire modeling of the SWIS has shown that modifications as opposed to re-wrapping of cables "improves plant safety Utilization of risk insights and fire modeling can result in greater safety improvement than strict compliance with Appendix R 6