Text

Summary of 970619 Meeting W/Licensee in Rockville,Md Re Corrective Actions & Schedules for Resolving Thermo-Lag Fire Barrier Issues at Mnps,Unit 2.List of Attendees Encl
	ML20141E053
Person / Time
Site:	Millstone
Issue date:	06/25/1997
From:	Mcdonald D; NRC (Affiliation Not Assigned)
To:	; NRC (Affiliation Not Assigned)
References
	NUDOCS 9706300198
	Download: ML20141E053 (36)
	v • d • e

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3 g3 ftf C L 4

4 UNITED STATES

.. g t

j NUCLEAR REGULATORY COMMISSION i

l WASHINGTON, D.C. 20066 4 001 l

f %*****,o# June 25, 1997 i

LICENSEE: Northeast Nuclear Energy Company (NNECO)

FACILITY: Millstone Nuclear Power Station, Unit No. 2 1

SUBJECT:

MEETING

SUMMARY

REGARDING THE JUNE 19, 1997, MEETING

} RESOLUTION OF THERM 0-LAG ISSUES i ,

. \

! PURPOSE l

1 Representatives of the Nuclear Regulatory Commission's (NRC's) Office of i Nuclear Reactor Regulation and NNECO met to discuss NNECO's corrective actions

and schedules for resolving the Thermo-Lag fire barrier issues at the !

)

~

Millstone Nuclear Power Station, Unit No. 2. The meeting was a followup of the April 24, 1997, meeting.

The meeting was held at NRC Headquarters in Rockville, Maryland. A list of

i. attendees is provided as Enclosure 1 and 'the reference material used by NNECO

{ is provided as Enclosure 2.

1

SUMMARY

l NNECO provided an overview of the work that has been completed, the work remaining to be done, identified the locations where Thermo-Lag is installed, i and the fixes that will be implemented. The fixes include the rerouting of i cables, upgrading of existing fire barriers, providing fire water as an

alternate cooling for the emergency diesel generators, and the removing of i Thermo-Lag from power cables with ampacity problems. The specific areas and

fixes are included in Enclosure 2. 1

' NNECO indicated that'it would need an exemption for the charging pump room due ;

to the lack of separation (18 feet instead of 20 feet) between the pumps and l no suppression. It was noted that the NRC staff had previously granted an exemption, which was later revoked based on subsequent modifications. The new i exemption request will be based on the configuration after fixes in this area l have been implemented. NNECO has also identified some potential errors or !

inconsistencies in the NRC staff's 1990 Safety Evaluation relating to fire !

protection as noted in Enclosure 2.

NNECO has committed to implement all of the Thermo-Lag fixes before plant startup. All other fire protection issues will be handled in accordance with i its Configuration Management Program. The NRC staff indicated that any 1

, NBC FILE CENTER COPY 1

9706300198 970625 '

PDR ADOCK 05000336 p PDR A

I o

1 June 25, 1997 requests for exemptions or other actions requiring staff review and approval should be submitted as soon as possible to allow the staff adequate time to respond to the request.

Original signed by:

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/encis: See next page l HARD COPY Docket File. '

PUBLIC SP0-L Memo SP0 Reading g l OGC ,Q \ l ACRS E-Mall

}{L SCollins/FMiraglia RZimmerman WTravers PMcKee DMcDonald

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WDean (WMD)

DOCUMENT NAME: G:

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06/ /97 06/ /97 DATF i O6/aff97 '~06/ff97 06/">/97 0FFICIAL RECORD COPY l

1 300040 a

--. , - - . . . . . . - .- . . =_- - - .-_ _ _

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i i requests for exemptions or other actions requiring staff review and approval should be submitted as Loon as possible to allow the staff adequate time to 3

respond to the request.

v __ L_O-Daniel G. Mcdonald Jr., Senior Project Manager Special Projects Office - Licensing j Office of Nuclear Reactor Regulation ,

' 1 Docket No. 50-336

?

Enclosures:

1. List of Attendees

2. Reference Material !

^

! cc w/encls: See next page 4

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1

ATTENDANCE LIST 06/19/1997 MEETING i

NORTHEAST UTILITIES / NUCLEAR REGULATORY COMMISSION NAME ORGANIZATION I

Daniel Mcdonald NRR/SP0 Bohdan M. Pokora NNEC0/MP2 Design Engineering l l

Paul D. Wagner NNEC0/MP2 Design Engineering l

Thomas Cleary NNECO/ Regulatory Affairs l l

! K. Steven West NRC/NRR M. H. Salley NRC/NRR e

/

Enclosurei

Millstone Lnit No. 2

~

. Thermo-Lag Effort Lpdate .

0 I

Paul D. Wagner Thomas G. Cleary Bohdan M. Pokora E June 19,1997 i

5 m

. i

. Background .

i

~

NNECO presented status of Thermo-Lag Resolution Effort to NRC Staff on April 24,1997.

NNECO committed to complete Thermo-Lag Resolution .

Study by June 1,1997 and to select fixes by June 15,1997.

i

- NNECO agreed to meet with NRC staffin June,1997 to present finalized fixes and discuss App R related heensmg ~

issues. -

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NNECO agreed to identify the proposed fixes and provide implementation schedule to NRC by July 1,1997. !

NNECO committed to implementation of Thermo-Lag fixes prior to startup.

--_ _-- =_===._-------a=.e es=humeu h-a m- --------"--------"-'-c--- " - -- - - - - - - - '

- ^- ------

Work Completed Since April 24, l 1997 Meeting l i

~

l j -

Completed Thermo-Lag Resolution Study.

Selected finalized Thermo-Lag fixes.

Approved funding for implementation of Thermo-Lag fixes.

Identified completion of Thermo-Lag fixes as a restart item.

t

. ~ Work Remaining To Be Done .

Resolve remaitiing Thermo-Lag ampacity calculation issues.

Complete licensing actions (ampacity RAI, exemption requests, clarify SER)

Initiate design change packages to implement fixes Evaluate design changes in accordance with 10CFR50.59 i i

Implement necessary design fixes (Prior to startup;

k Areas Where Thermo-Lag Is Currently Installed

- Auxiliary Buildin'g Cable Vault (R-1)

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

- I hour requirement . ,

- Z1 Switchgear Room (R-14)

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

- Charging Pump Cubicle Area (R-4)

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

- Turbine Building (R-3)

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

\ .

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

~

Components Power Feeder Cables to Z2 480V MCC B61 Power Feeder Cables to Z2 Battery Charger i

DC1 120 vac and 125 vde power cables for Fire Shutdown Panel C09 and C10 Fix Upgrade existing Thermo-Lag installations to 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months rating using XEI Application Guide

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

~

Components Power Cables for Charging Pumps P18B,P18C .

Fix Reroute cables directly from MCC to West Penetration Area 4

Skatch G AUXILIARY BUILDING WEST PENETRATION AREA -

FIRE AREA R-2 4*'

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Thermo-Lag Fixes For Charging Pump Cubicle Area (R-4)

Components

^

Z1 and Z2 power cables for Charging Pumps P18A, P18B, and P18C Fix

Reroute Z2 power cables for Charging Pump P18B and P18C through 'A' SI Pump Room (R-5)

Remove Thermo-Lag from charging pump cables with ampacity problems e

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CABLE RE-ROUTES BELOW CHARGING PUMP CUBICLES

~

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

~

Co~mponents App R related Z2 instrument and control cables.

Fix Install Thermo-Lag overlay material on Z2 wireways andjunction boxes to achieve 3 hour3.472222e-5 days 8.333333e-4 hours 4.960317e-6 weeks 1.1415e-6 months rating l

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

Components App R related Z2 instrument and control cables Fix Upgrade existing Thermo-Lag install ~ations -

on Z2 instrument and control cables to 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months rating using NEI Application Guide

.j

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

Component Control Cable for Turbine Driven Auxiliary Feedwater Pump -

Proposed Fix Reroute cable through West Penetration t

Area (R-2) ;

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RE-ROUTE OF Z2T871 OUT OF FIRE AREA R-3

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

Components Backfeed Power Cables '

Proposed Fix .

Provide hard piped connection to cool EDG with Firewater.

Remove Thermo-Lag from backfeed cables with ampacity problems

, i

Sketch B AUXILIARY BUILDING El.14'-6" L,

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SERVICE WATER FEBor.8 , ,

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DIESEL GENERATORS, BUILOlNG FilsEAmm --- !

p _ -_ & s w EXISTING FIRE WATER HEADER VENTILATION WITH EXISTING 6" VALVE ) *

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EQUIPMENT 1- -

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. 2.___ i r ;

PERMANENT CROSS CONNECT BETWEEN j FIRE WATER AND SERVICE WATER i

t Approximate Amount Of

~ Thermo-Lag Currently At Millstone Unit 2 Conduit 300 linear feet Single cable tray 160 linear feet Cables wrapped in tray 170 linear feet Wireways (i.e. tray) 90 linear feet

. .j Thermo-Lag Eliminated After ;

Fixes Implemented 'l i

^

t 57% of conduit -

l 94% of cable tray

s Summary of Planned Fixes

- Reroute Charging Pump ~ Power Cable in R-1.

Upgrade remaining Thermo-Lag installations in Fire Area R-1 to provide a full 1-hour fire barrier.

Upgrade Thermo-Lag installations in the Cable Vault portion of Fire Area R-14 to provide a full 1-hour fire barrier.

- Upgrade the Thermo-Lag on the wireways and junction boxes in the Switchgear Room portion of Fire Area R-14 to provide a full 3-hour fire 4 barrier. i t

- Install valves and a 6" line between the Fire Water and Service Water Systems to provide an alternate cooling water source to the Emergency Diesel Generators when the Service' Water Pumps are not available.

t

- Reroute cables associated with the Charging Pumps and Turbine Dnven Auxiliary Feedwater Pump.

- Remove Thermo-Lag from backfeed and charging pump power cables with ampacity problems.

l

~ Appendix R Open Licensing Issues and Discrepancies Exemption for Charging Pump Room E nsealed Penetrations in Wall Between Turbine Driven and Motor Driven Auxiliary ,

Feed Pump Rooms i

Classification of Alternate Shutdown Areas E se of Backfeed for Turbine Building Fire I

. [

~

Charging Pump Room s

Exemption ,

~

Initial exemption required due to:

Lack of area wide automatic suppression .

Lack of 20 ft of separation between charging pumps

, Lack of a one hour rated fire barrier ;

between charging pumps s

~

Charging Pump Room Exemption Initial exemption gave credit for:

Area wide fire detection 18 ft of separation between charging pumps Partial height missile shield between charging pumps 1 hr rated enclosure for charging pump .

cables Low fire loading in the area Curbs in front of each pump cubicle . .

~

Charging Pump Room s

Exemption XSECO installed 3 hr wrap on charging pump cables NRC revoked the exemption on the basis 4

that with three hr wrap, area met III.G.2 ,

requirements

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Charging Pump Room Exemption

~

- We will be requesting an exemption for 18 ft separation and partial height walls .

between pumps The exemption request will be revised to .

reflect area configuration after chargmg pump cable reroute and Thermo-Lag removal

Unsealed Penetrations Between TD and MD AFW Pump Rooms Exemption was granted for lack of a rated fire door between the TDAFW and MDAFW rooms .

XSECO docketed an 86-l'O Evaluation justifying unsealed openings in these rooms (April 16,1987) 1990 SER retained exemption for non-rated door and stated that there were no other openings in the wall between the two rooms

~

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Classification of Alternate Shutdown Areas 1990 SER classifies the following as alternate shutdown areas:

West Penetration Area, MCC B61, and Z-2 Switchgear Room and Cable Vault (R-2)

Z-1 DC Equipment and Battery Room 'A'

~

(R-9)

Z-2 DC Equipment and Battery Room 'B' (R-10)

Containment Building (R-15)

~

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Classification of Alternate Shutdown Areas Control Rooni is primary shutdown location for these areas EDG available to power App R shutdown components Operator actions outside control room compensate for spurious actuations and .

component failures Cold shutdown repairs not required

~ Use of Backfeed for Turbine ;

Building Fire 1990 SER states that Unit 1 to Unit 2 backfeed provides AC power for a Turbine Building Fire (R-3)

XSECO plans to providehard pipe connection from Fire Water System to EDG coolers so that EDG's can be used to provide AC power for an R-3 fire XSECO will perform 50.59 review of proposed modification and docket SER implications. .

Io l

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

Citizens Regulatory Commission i

Lillian M. Cuoco, Esquire ATTN: Ms. Susan Perry Luxton Senior Nuclear Counsel 180 Great Neck Road Northeast Utilities Service Company Waterford, Connecticut 06385 P. O. Box 270 Hartford, CT 06141-0270 Mr. F. C. Rothen Vice President - Nuclear Work Services Mr. John Buckingham Northeast Nuclear Energy Company

, Department of Public Utility Control P. O. Box 128 Electric Unit Waterford, CT 06385 10 Liberty Square New Britain, CT 06051 Ernest C. Hadley, Esquire 1040 B Main Street

. Mr. Kevin T. A. McCarthy, Director P.O. Box 549

Monitoring and Radiation Division West Wareham, MA 02576 Department of Environmental Protection 79 Elm Street Mr. D. M. Goebel Hartford, CT 06106-5127 Vice President - Nuclear Oversight Northeast Nuclear Energy Company i Regional Administrator, Region I P. O. Box 128 U.S. Nuclear Regulatory Commission Waterford, CT 06385

! 475 Allendale Road l King of Prussia, PA 19406 Mr. M. L. Bowling, Jr.

Millstone Unit No. 2 Nuclear First Selectmen Recovery Officer Town of Waterford Northeast Nuclear Energy Company Hall of Records P. O. Box 128 200 Boston Post Road Waterford, CT 06385 !

Waterford, CT 06385 Mr. J. K. Thayer l Mr. Wayne D. Lanning Recovery Officer - Nuclear Engineering Deputy Director of Inspections and Support i

Special Projects Office Northeast Nuclear Energy Company !

475 Allendale Road P. O. Box 128 !

King of Prussia, PA 19406-1415 Waterford, CT 06385 i l

Charles Brinkman, Manager Deborah Katz, President Washington Nuclear Operations Citizens Awareness Network ABB Combustion Engineering P. O. Box 83 12300 Twinbrook Pkwy, Suite 330 Shelburne Falls, MA 03170 Rockville,'MD 20852 i Mr. B. D. Kenyon Senior Resident Inspector President and Chief l Millstone Nuclear Power Station Executive Officer l c/o U.S. Nuclear Power Station Northeast Nuclear Energy Company P.p. Box 513 P. 0. Box 128 Niantic, CT 06357 Waterford, Connecticut 06385 l

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Mr. Allan Johanson, Assistant Director Office of Policy and Management Policy Development and Planning Division 450 Capitol Avenue - MS# 52ERN P. O. Box 341441 Hartford, CT 06134-1441 Mr. Neil S. Carns Senior Vice President and Chief Nuclear Officer Northeast Nuclear Energy Company

. c/o Mr. Richard T. Laudenat i Director - Regulatory Affairs P.O. Box 128 Waterford, CT 06385 i

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ML20141E053

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