ML20141B479

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Summary of 970424 Meeting W/Licensee Re Thermo-Lag Fire Barrier Issues.Attendance List & Ref Matl Provided by Util Encl
ML20141B479
Person / Time
Site: Millstone Dominion icon.png
Issue date: 05/12/1997
From: Mcdonald D
NRC (Affiliation Not Assigned)
To:
NRC (Affiliation Not Assigned)
References
NUDOCS 9705150302
Download: ML20141B479 (27)
v • d • e


Text

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p . ,\- UNITED STATES

r il NUCLEAR REGULATORY COMMISSION 1 WASHINGTON. D.C. SegeHoot May 12, 1997

\*****  ;

LICENSEE: Northeast Nuclear Energy Company (NNECO) 3 -.

FACILITY: Millstone Nuclear Power Station, Unit No. 2

SUBJECT:

MEETING SUNiARY REGARDING THE APRIL 24, 1997, MEETING HELD.TO I DISCUSS THERMO-LAG FIRE BARRIER ISSUES - MILLSTONE NUCLEAR POWER STATION, UNIT NO. 2 l

PURPOSE }

The meeting was convened to provide representatives of NNECO an opportunity to ,

. discuss, with members of the Nuclear Regulatory Commission's (NRC's) Office of *

. Nuclear Reactor Regulation, its ongoing efforts and schedules for resolution  ;

of Thermo-Lag fire barrier issues at the Millstone Nuclear Power Station, Unit ,

No. 2. The meeting was a followup of a telephone conference call on April 14, '

t 1997.

The meeting was held at the NRC's One White Flint North office in Rockville, Maryland. A list of attendees is attached as Enclosure 1 and the reference material provided by NNECO is attached as Enclosure 2.

SUNiARY i

NNECO indicated that.approximately 700 linear feet of 1-hour and 3-hour Thermo-Lag material is installed over conduits, cables, and cable trays at the Millstone Nuclear Power Station, Unit No. 2. NNECO acquired the services of '

i Duke Energy and Services to perform a study on fire barrier configurations -l outside of the scope of Nuclear Energy Institute (NEI) Application Guide and provide recommendations for resolving outstanding Thermo-Lag issues. Based on

, preliminary results of the study, NNECO is considering (individually or in combinations) the following corrective actions: Justify or upgrade existing 4

installations, reroute cables, replace cables with 1-hour rated cables, add suppression,~ credit operator action, request exemptions, or use alternate safe shutdown approaches. NNECO further indicated that it would finalize its corrective action plans by June 15, 1997, initiate design change packages by

. July 15, 1997, and would complete the required modifications prior to restart from the current extended outage. The NRC staff will meet with NNECO in mid-June 1997, to. discuss its final corrective action plans, including any

. required reviews and approvals that might be necessary depending on the final corrective actions-chosen by NNECO.

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NRC FH.F CENTER COPY 9705150302 970512

.PDR ADOCK 05000336 P PDR .a

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The NRC staff indicated that, based on the information provided during the meeting (as detailed in Enclosure 2), NNECO is making progress toward the overall resolution of the Thermo-Lag issues at the Millstone Nuclear Power Station, Unit No. 2, and that the proposed completion of the corrective actions prior to restart from the current outage is reasonable.

Daniel G. Mcdonald Jr., Senior Project Manager Special Projects Office - Licensing Office of Nuclear Reactor Regulation Docket No. 50-336

Enclosures:

1. List of Attendees
2. Reference Material cc w/encls: See next page 4

l I

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May 12, 1997 The NRC staff indicated that, based on the information provided during the meeting (as detailed in Enclosure 2), NNECO is making progress toward the overall resolution of the Thermo-Lag issues at the Millstone Nuclear Power Station, Unit No. 2, and that the proposed completion of the corrective actions prior to restart from the current outage is reasonable.

Original signed by:

Daniel G. Mcdonald Jr., Senior Project Manager Special Projects Offic? - Licensing Office of Nuclear Reactor Regulation Docket No. 50-336

Enclosures:

1. List of Attendees
2. Reference Material ,

cc w/encls: See next page HARD COPY 100cket File PUBLIC SP0-L Memo SP0 Reading OGC ACRS 1

E-MAIL Scollins/FMiraglia RZimmerman l WTravers l PMcKee DMcDonald LBerry Dross (e-mail to SAM)

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\TE 05/d5/9',* 05/C/ /97 05/57 /97 ' 05//L /97 0FFICIAL RECORD COPY

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- j Northeast Nuclear Energy Company Millstone Nuclear Power Station Unit 2  ;

cc:

i Lillian M. Cuoco, Esquire Mr. F. C. Rothen Senior Nuclear Counsel Vice President - Nuclear Work Services Northeast Utilities Service Company Northeast Nuclear Energy Company P. O. Box 270 P. O. Box 128 i Hartford, CT 06141-0270 Waterford, CT 06385 Mr. John Buckingham Ernest C. Hadley, Esquire Department of Public Utility Control 1040 B Main Street Electric Unit P.O. Box 549 10 Liberty Square West Wareham, MA 02576 New Britain, CT 06051

, Mr. D. M. Goebel Mr. Kevin T. A. McCarthy, Director Vice President - Nuclear Oversight Monitoring and Radiation Division Northeast Nuclear Energy Company Department of Environmental Protection P. O. Box 128 79 Elm Street Waterford, CT 06385 Hartford, CT 06106-5127 Mr. M. L. Bowling, Jr.

Regional Administrator, Region I Millstone Unit No. 2 Nuclear ,

U.S. Nuclear Regulatory Commission Recovery Officer ,

475 Allendale Road Northeast Nuclear Energy Company i King of Prussia, PA 19406 P. O. Box 128 Waterford, CT 06385 '

First Selectmen Town of Waterford Mr. J. K. Thayer ,

Hall of Records Recovery Officer - Nuclear Engineering 200 Boston Post Road and Support Waterford: CT 06385 Northeast Nuclear Energy Company -

P. O. Box 128 Mr. Wayne D. Lanning Waterford, CT 06385 l Deputy Director of Inspections i Special Pro,iects office Mr. B. D. Kenyon '

475 Allendale Road President and Chief i King of Prussia, PA 19406-1415 Executive Officer  :

Northeast Nuclear Energy Company Charles Brinkman, Manager P. O. Box 128 Washington Nuclear Operations Waterford, Connecticut 06385  !

ABB Combustion Engineering 1 12300 Twinbrook Pkwy, Suite 330 Mr. Allan Johanson, Assistant Director Rockville, MD 20852 Office of Policy and Management Policy Development and Planning

  • Senior Resident Inspector Division l Millstone Nuclear Power Station 450 Capitol Avenue - MS# 52ERN  ;

c/o U.S. Nuclear Power Station P. O. Box 341441 P.O. Box 513 Hartford, CT 06134-1441 Niantic, CT 06357 ,

l

Northeast Nuclear Energy Company Millstone Nuclear Power Station Unit 2 cc:

Citizens Regulatory Commission ATTN: Ms. Susan Perry Luxton 180 Great Neck Road Waterford, Connecticut 06385 .

Deborah Katz, President Citizens Awareness Network ,

P. 0. Box 83 Shelburne Falls, MA 03170 The Honorable Terry Concannon Co-Chair .

Nuclear Energy Advisory Council Room 4035 Legislative Office Building Capitol Avenue Hartford, Connecticut 06106 Mr. Evan W. Woo 11acott Co-Chair Nuclear Energy Advisory Council 128 Terry's Plain Road Simsbury, Connecticut 06070 Little Harbor Consultants, Inc.

Millstone - ITPOP Project Office P. O. Box 0630 Niantic, Connecticut 06357-0630 l

l

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d ATTENDANCE LIST 04/24/1997 MEETING NORTHEAST UTILITIES / NUCLEAR REGULATORY COMMISSION NAME ORGANIZATION Daniel G. Mcdonald MRR/SP0 Steve West MRR/SPLB Linh Tran MRR/DRPW Daniele Oudinot MRR/SPLB Phil McKee MRR/SP0 l l Raymond Mecci Mortheast Utilities /MP2 Harry Miller Mortheast Utilities /MP2 1

Martin L. Bowling MP2 Recovery Officer Bohdan M. Pokora MP2 Design Engineering L.B. Marsh MRR/SPLB 4

i i

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Ehclosure 1

4 6

Millstone Unit No. 2 Thermo-Lag Resolution Effort .

't 1

Martin L. Bowling

~

Raymond P. Necci Harry L. Miller Bohdan M. Pokora 1

1 E April 24,1997 i

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Background i .

NRC Bulletin 92-01, Supplement 01 to GL 86-10, and GL i

92-08 identify Thermo-Lag fire rating and ampacity problems.

4 NUMARC and NEI conduct Thermo-Lag fire endurance test program.

NU responds to NRC request for information regarding Thermo-Lag installations at Millstone Unit No. 2 (March, 1995).

NU~ submits schedule for resolution of Thermo-Lag-issues at Millstone Unit No. 2 (February,1996).

4 Accomplishments to Date Chemical and Physical Analysis of Thermo-Lag Material for Quality Assurance (March 1995)

Thermo-Lag Assessment Report Prepared (August 1995, .

revised April 1996) - compared MP2 installations to NEI Application Guide Issued generic Thermo-Lag specifications for installation, inspection, and maintenance as well as for procurement and storage (March,1997)

Therm.o-Lag Resolution Study underway (February,1997) l l

l l

Work Remaining To Be Done  :

Complete NU review of study (June 1,1997)

Review and select proposed fixes (June 15,1997) i Identi: 9 proposed fixes and provide implementation schedule to NRC (July 1,1997) i l Initiate design change packages to implement fixes (July 1,1997) j Implement necessary design fixes (Prior to startup) m.___- _- _ _..____________.._s_.______...______._.__________________2 _ ** .' --n-s-' e- e rwe'

  • P

O Approximate Amount Of

! Thermo-Lag At The Millstone Point .

E ni.t 2 Station Conduit 300 linear feet Single cable: tray 160 linear feet Cables wrapped in tray 170 linear feet i -

Wireways (i.e. tray) 90 linear feet l

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Areas Where Thermo-Lag Is Installed .

i

- Auxiliary Building Cable Vault (R-1) j

- 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> requirement Z1 Cable Vault (R-14)

- 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> requirement Z1 Switchgear Room (R-14)

- 3 hour3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br /> requirement Charging Pump Cubicle Area (R-4)

- 3 hour3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br /> requirement l

- Turbine Building (R-3)

- 3 hour3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br /> requirement

- - _ _ _- - . _ - _ _ - _ _ - _ - _ _ - _ _ _ _ _ - - _ - - . - _ . _ _ _ _ - . . . . .._J

'l Approach To Thermo-Lag l Resolution Considered In Study Review existing Thermo-Lag installations for

overprotection Credit operator actions Identify adequate Thermo-Lag installations Review Installations for possible upgrade l -

Review for alternate methods to accomplish shutdown function 4

Identify possible cable reroutes 1

e Proposed Thermo-Lag Resolution At Millstone Consists Of: .

Justification of existing installations Upgrades of existing installations Cable Reroutes Alternate shutdown approaches i

4 m

Resolution Of Ampacity Issues .

i Remove Thermo-Lag .

- Alternative methods ofprotection

- Cable Reroutes

- Alternate Shutdown Methods Remove conservatisms from Ampacity l Calculations

l Thermo-Lag Fixes For Auxiliary

Building Cable Vault (R-1)

Components i

Power Feeder Cables to Z2 480V MCC B61 Power Feeder Cables to Z2 Battery Charger DC1 120 vac and 125 vde power cables for Fire Shutdown Panel C09 and C10 Proposed Fix l Upgrade existing Thermo-Lag installations to 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> rating using XEI Application

~

Guide

Thermo-Lag Fixes For Auxiliary Building Cable Vault (R-1)

Components Power Cables for Charging Pumps P18B,P18C
Proposed Fix Reroute cables directly from MCC to West Penetration Area

Thermo-Lag Fixes For Charging 1

Pump Cubicle Area (R-4) 1 Reroute Z2 power cables for Charging j Pump P18B and.P18C through 'A' SI Pump Room (R-5)

or Replace existing charging pump power cables with 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> rated cables. Provide sprinkler protection for common cable tray

Thermo-Lag Fixes For Z1 l Switchgear Room (R-14)

Install Thermo-Lag overlay material on Z1 l-.

instrument and control raceway to achieve 3

hour rating or Credit operator actions for local reading of

. instruments and manipulation of valves l

i Thermo-Lag Fixes For Z1 Cable Vault (R-14)

Upgrade existing Thermo-Lag installations on Z2 instrument and control cables to 1 .

hour rating using NEI Application Guide -

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Thermo-Lag Fixes For Turbine Building (R-3)

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Component

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i Control Cable for Turbine Driven Auxiliary Feedwater Pump Proposed Fix

Reroute cable through West Penetration 1 Area (R-2) or-Upgrade existing Thermo-Lag installation to 3 hour3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br /> rating

Thermo-Lag Fixes For Turbine ,

Building (R-3) .

Components l

Backfeed Power Cables .

Proposed Fix

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i Provide hard piped connection to cool EDG

with Firewater .

or Reroute cables with ampacity problems and provide 3 hour3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br /> rated wrap for remainder

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a Summary of Recommended Options i

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Upgrade the Thermo-Lag on all raceways in Fire Area R-1 and the Cable Vault portion ofFire Area R-14 to provide a full 1-hour fire barrier. Reroute Charging Pump Power Cable in R-1.

4 Upgrade the Thermo-Lag on the wireways andjunction boxes in the; ,

Switchgear Room portion ofFire Area R-14 to provide a full 3-hour .

fire barrier.

Install valves and a 6" line that will provide a cross connect between the Fire Water and Service Water Systems. This modification will '

provide an alternate cooling water source to the Emergency Diesel Generators when the Service Water Pumps are not available.

Reroute cables associated with the Charging Pumps and Turbine

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Driven Auxiliary FeedwaterPump.

Challenges Associated With Thermo-Lag Resolution Parallel Appendix R re-analysis, Appendix R Procedure Upgrade and IN92-18 work l Changes to SER, clarification of exemptions l

Thermo-Lag Related Work Which Could be Conducted With Plant On-Line t

Prefabricate Fire Water to Diesel Cooler piping and hangers Pre-install rerouted cables and conduit I

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! Summary Of Remaining GL 92-08 Work j Complete Thermo-Lag Resolution Study to identify potential fixes (June 1,1997) i Review study and select Thermo-Lag fixes (June 15,1997) - -

Identify proposed fixes to NRC (July 1, 1997) i Initiate design change packages to implement fixes (July 1,1997)

Implement design changes (Prior to startup)

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~ l h rip 6on~- aam i ,,, , man ,,,,,-i may i ,un i aut i aus i ser i - 1 -v i - aan i ces i man Thermolag Resolution study Thermolag Re solution Study '

15FEB97Ammmmmmmmmmmmme summmmmmE91JUN97 3iiilect Thermolag Flxes Select Thermolag Fixes 01JUN97zwK715JUN97*

Prepare Thermolag Prepare Thermolag Resolution Letter

' Resolution Letter 1SJUN97ammup01JUL9P ilCAMiart ICAVP Start l 23JUN974 Prepare Design Change Prepare Design Change Package 01 Jut 97-731AUG9P l Package Implement Design Changes Implement Design Changes 01SEP97-16NOV97*

Ready for Restart Ready for Restart 16DEC974 DE **

.ow C o.

Northeast Utilities Millstone Unit 2 Resolution of GL92-08 Issues cc m= Revision 1

__ ______ _ _____________ _ _ _ _ - _ _ _ _ _ _ _ _ _ _ _ _ ____ . _ _ _ _ _ _ _ _ _ . - . _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ . _ _ _ _ . _ _ _ _ _ _ _ . _ _ _ _ _ _ _ _ _ _ . _ _ . _ _ _ _ _ _ _ _ _ _ _ _ _

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