ML20140B470
| ML20140B470 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 06/04/1997 |
| From: | Hernan R NRC (Affiliation Not Assigned) |
| To: | NRC (Affiliation Not Assigned) |
| References | |
| NUDOCS 9706060223 | |
| Download: ML20140B470 (32) | |
Text
{{#Wiki_filter:_ _ _ _ _ _ _ _ _ _ _ - - _ - - M:uq $o-S27/32B g* k UNITED STATES j NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20666-0001
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June 4, 1997 . LICENSEE: Tennessee Valley Authority FACILITY: Sequoyah Nuclear Plant, Units I and 2
SUBJECT:
SUMMARY
- May 30, 1997, MEETING WITH TVA TO BRIEF THE STAFF ON THE STATUS OF THERM 0-LAG FIRE BARRIER UPGRADES AT SEQUOYAH On May 30, 1997, representatives of the Tennessee Valley Authority (TVA) met with members of the NRC staff in Rockville, Maryland. TVA requested this meeting as a followup to a meeting on November 4, 1996, to discuss the status of the Thermo-Lag fire barrier corrective action program at the Sequoyah Nuclear Plant (SQN) and the schedule for completion of the program. A list of attendees is given in Enclosure 1. Copies of the handouts provided by TVA are given in Enclosure 2.
TVA representatives discussed the Thermo-Lag testing program they conducted in order to gain the necessary confidence that use of additional Thermo-Lag material in the upgrades would be prudent. This testing included fire endurance testing, material property and composition testing, ampacity (current carrying capacity) derate testing, and seismic testing. There are approximately 4,400 linear feet of single conduit configurations and 1,650 square feet of special configurations that utilize Thermo-Lag at SQN. On the basis of its test results, TVA believes that approximately 2,100 feet of the linear configuration Thermo-Lag can be qualified as is. The remainder of the fire barriers will need to be upgraded. In addition, TVA plans to replace approximately 2700 linear feet of Kaowool insulation. Standard designs have been developed and detailed walkdowns are about 70% completed to verify the qualification of the 2,100 feet of linear barrier and to apply the standard designs to the remaining configurations. TVA plans to train and use a number of relatively small installation teams to ensure quality wrirk and to minimize risk of plant transients while the plants are operating. which will be throughout most of the walkdowns and installation of the upgrades. The walkdowns and the installation of the additional material requires erection of temporary scaffolding and much of this work will be in proximity to sensitive equipment (mostly electrical panels and instrumentation). TVA has budgeted approximately $6.8 million for Thermo-Lag upgrades during FY 97, FY 98, and FY 99. Detailed engineering started in October 1996 following completion of the test program. TVA stated that the pre-installation walkdowns are approximately 70% complete and that the walkdowns have been classified in three categories according to relative risk. Thermo-Lag removal has begun and installation of upgrades will start in October 1997 following completion of design and qualification of personnel. Personnel qualification will include test installations as well as a written examination. 9706060223 970604 PDR ADOCK 05000327 P PDR n
TVA stated (as shown in Enclosure 2) that the Thermo-Lag upgrades are , scheduled to be completed in June 1999 and the Kaowool replacement will be completed in August 1999. The staff requested written confirmation of these dates to be documented by letter from TVA. The staff considers these dates to be firm. Y. W Ronald W. Hernan, Senior Project Manager Project Directorate II-3 Division of Reactor Projects - I/II Office of Nuclear Reactor Regulation Docket Nos. 50-327 and 50-328
Enclosures:
- 1. Attendance List
- 2. TVA Handout cc w/ enclosures: See next page
' 4 l TVA stated (as shown in Enclosure 2) that the Thermo-Lag upgrades are scheduled to be completed in June 1999 and the Kaowool replacement will be completed in August 1999. The staff requested written confirmation of these dates to be documented by letter from TVA. The staff considers these dates to be firm.
original signed by R.Hernan Ronald W. Hernan, Senior Project Manager Project Directorate II-3 Division of Reactor Projects - I/II Office of Nuclear Reactor Regulation Docket Hos. 50-327 and 50-328
Enclosures:
- 1. Attendance List
- 2. TVA Handout cc w/ enclosures: See next page DOCUMENT NAME: G:\SQN\MTGSUM-5.30 *See previous concurrence is rec 2fve a copy of this document, indicate in the box: "C" = copy without attachment / enclosure aE" a copy with attachment / enclosure "N" = No copy 0FFICE i PO!! 3/PM /l _lf l PDil 3/LA / l L, SPS./BC + l ' PDII-3/PD g
') lC NAME RHernan f//f r// BClayton 4.(7 TMarsh FHebdon 7C DATE 6/ 4 /97 ' 6/ n /97 6/ 3 /97 6/ u /97 L
Off!CIAL RECORD COPY
I ( l i HARD COPY (w/ Enclosures 1 and 2) HARD COPY (w/ Enclosure 1) 7 Docket-File:."" 0GC PUBLIC ACRS PDII-3 Reading j l E-Mail (w/ Enclosure'11 '-
- S. Collins /F. Miraglia (FJM) t R. Zimmerman (RPZ)
T. Martin (TTM)- S.=Varga (SAV) '!' G. Holahan (GMH) ' J. Zwolinski (JAZ) E. Jordan (JKR) . T.. Marsh (LBM) . S. West (KSW)- 1 F. Hebdon (FJH) L. Tran_(LNT)- l L. Whitney (LEWI) i P. Madden (PMM) G. Tracy (GMT) ; J. Johnson (JRJ) i R. Hernan (RWH) ! D. Starkey-(DRS) J B. Clayton (BAC2) G. Wiseman (GRW) l 3 9\ l L ! i ! 060030 \
i SEQUOYAH NUCLEAR PLANT cc: Mr. Olive'r D. Kingsley, Jr. Mr. J. T. Herron, Plant Manager Tennessee Valley Authority Sequoyah Nuclear Plant President, TVA Nuclear and Tennessee Valley Authority Chief Nuclear Officer P.O. Box 2000 Tennessee Valley Authority Soddy Daisy, TN 37379 ' 6A Lookout Place , 1101 Market Street Regional Administrator Chattanooga, TN 37402-2801 U.S. Nuclear Regulatory Commission Region II Mr. O. J. Zeringue, Sr. Vice President 61 Forsyth Street, SW., Suite 23T85 Nuclear Operations Atlanta, GA 30303-3415 Tennessee Valley Authority 6A Lookout Place Mr. Melvin'C. Sharc.an 1101 Market Street Senior Resident laspactor Chattanooga, TN 37402-2801 Sequoyah Nuclea- Plant i U.S. Nuclear Regulatery Commission l Mr. Jack A. Bailey, Vice President 2600 Igou Ferry Road
- Engineering & Technical Services Soddy Daisy, TN 37379 Tennessee Valley Authority 6A Lookout Place Mr. Michael H. Mobley, Director !
1)01 Market Street Division of Radiological Health Chattanooga, TN 37402-2801 3rd Floor, L and C f.anex 401 Church Street Mr. R. J. Adney, Site Vice President Nashville, TN 372Ai-1532 l Sequoyah Nuclear Plant Tennessee Valley Authority County Executive ; P.O. Box 2000 . Hamilton County Courthouse l Soddy Daisy, TN 37379 Chattanooga, TN 3/402-2801 ' General Counsel Tennessee Valley Authority ET 10H 400 West Summit Hill Drive Knoxville, TN 37902 Mr. Raul R. Baron, General Manager Nuclear Assurance and Licensing Tennessee Valley Authority 4J Blue Ridge l 1101 Market Street Chattanooga, TN 37402-2801 Mr. Pedro Salas, Manager Licensing and Industry Affairs Tennessee Valley Authority 4J Blue Ridge 1101 Market Street l Chattanooga, TN 37402-2801 l Mr. Ralph H. Shell, Manager Licensing and Industry Affairs Sequoyah Nuclear Plant Tennessee Valley Authority P.O. Box 2000 Soddy Daisy, TN 37379
i 4 ATTENDEES NRC/TVA MEETING ON MAY 30. 1997 REGARDING THERMO-LAG l
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! HAmg Affiliation > l Ron Hernan NRC l Fred Hebdon - NRC. K. Steven West NRC L. B. Marsh NRC G. Wiseman NRC R. D. Starkey NRC T. Martin NRC ' i G. Holahan NRC R. Adney TVA
- 0. J. Zeringue TVA Mike Lorek TVA Jon R. Rupert TVA Raul R. Baron TVA Ed Wenzinger NUS 1
l I ENCLOSURE 1
i t t t I Tennessee Valley Authority Sequoyah Nuclear Plant TVA/NRC Thermo-Lag Meeting , May 30,1997-I I l P m N g- r i
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. Sequoyah Nuclear Plant -
TVA/NRC Thermo-Lag Management Meeting , May 30,1997 Agenda Introduction - R. J. Adney . Thermo-Lag History - J. R. Rupert Scope of Sequoyah Thermo-Lag Use M. J. Lorek Current Resolution Status M. J. Lorek ' Additional Thermo-Lag Application M. J. Lorek : Summary R. J. Adney l i h I . 4 l l . _ _ _ i
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*A '% wm .ee se . Sequoyah Nuclear Plant -
Thermo-Lag History Testing
- Test methodology developed October 1992 i
- Fire endurance testing Phase I October 1992 through April 1993 Fundamental Configurations - I hour j Phase II June 1993 through October 1993 Complex Geometries - I hour Phase III October 1994 through January 1995 3-hour Qualification for WBN -
Phase IV November 1995 through January 1996 SQN Material Properties & Old (1988)
- Material
! - Ampacity testing - Done in conjunction with each of the fire endurance tests (Phase I-Phase IV)
- Seismic testing Static / Mechanical Properties September 1994 through October 1994 Dynamic / Shake Tabie September 1994 through October 1994 Material / Lot Acceptance Test March 1995 through August 1995 i
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. Sequoyah Nuclear Plant -
l Thermo-Lag History 1 Thermo-Lag is being balanced with other SQN work activities
- Cash flow FY 97 FY 98 . FY 99
$748,000 $3,076,000 $2,996,000 TVAN
- Previous expenditures i FY 92 FY 93 FY 94' FY 9.1 FY 96 '
Testing 4,341 278,839 50,000 180,610 44,516 t BFN specific 166,058 1,946,000 18,000 600,000 180,000 SQN specific 3,900 98,200 68,200 . WBN specific 3,632,237 15,341,312 1,810,000 i Total 170,399 2,224,839 3,704,137 .16,220,122 2,102,716 4 ; a
- Sequoyah Nuclear Plant i
Scope of Sequoyah Thermo-Lag Use ' f I i [ 5 j. , I i s r t
Sequoyah Nuclear Plant Scope of Sequoyah Thermo-Lag Use 4 SQN Scope
- Approximately 4400 linear feet of Single Conduit (l",1-1/2",2",2-1/2",3", and 4")
l - Approximately 1650 square feet of Special Configurations
- Four boxed conduit configurations (3-4" and 1-2") s
! - Twentyjunction boxes
- Three cable trays
- In addition, approximately 2700 linear feet of Kaowool to be replaced NOTE: The 1",1-1/2",2", and 2-1/2" conduit is qualified to a minimum of 40 minutes out of 60 minutes, but does not meet our full qualification (approximately 2240 linear feet).
^ J I . i
r l .. 1 i, . I Sequoyah Nuclear Plant 4 j s . 4
- d. ,
j i 4 Current Resolution. Status ' i t T i j - 7 ji l I . 3
i Sequoyah Nuclear Plant ! Completed Resolution Items i Reduction Study - Engineering Review / Acceptance of l Altemate Compliance Strategies i - Engineering / Operations Review of Reduction Study l Detailed Scoping Study - Design Phase Sequoyah Specific Testing
- - Testing completed
- Engineering review / acceptance of tests .
l Finalized Reduction Scope - November 1996 l Design Standard Revision (Sequoyah Applicable) - i February 1997 Issued Removal DCNs - February 1997 General Engineering Specification (Sequoyah Applicable) -
- February 1997 l
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Sequoyah Nuclear Plant Current Resolution Status 4 Began Detailed Engineering (Upgrades and Removals) - October 1996 i Sequoyah Typical Drawings - February 1997 (To be issued with DCNs) Personnel Training - Ongoing Electronic Electrical Fire Barrier Raceway Database - March 1997 . Began Constructability Walkdowns - March 1997 9 .h I e ,
Sequoyah Nuclear Plant Current Resolution Status Constructability Walkdowns
- Purpose '
Verify location specific details of existing Thermo-Lag a Finalize location specific upgrades for Thermo-Lag Readdress attendant concerns (conduit spans, hangers, interferences, etc.)
- Walkdown Procedure - March 1997
- Area Priorities Priority 1 - May 1997 (85% complete)
Priority 2 - June 1997 (10% complete) Priority 3 - July 1997 (10% complete) NOTE: The 3" and 4" single conduit is expected to be qualified for use-as-is as a result of Engineering walkdowns and testing done in Fiscal Year 1997 (approximately 2130 linear feet). 10 !. 1
Sequoyah Nuclear Plant Current Resolution Status Walkdown attributes
- Thermo-Lag installations will be walked down Dedicated, specially-trained team consisting of fire protection engineers, electrical engineers, civil engineers, modifications engineers, and operations
- Special scaffolding required, some in close proximity to sensitive equipment
- Team will perform detailed documented inspections of existing installation for attributes such as:
Correct thickness Correct surface texture Cracks or shrinkage in material Visible gaps or separation from adjacent materials Compliance with requirements to cover intervening items 11 r. i ', e .
ucLear Piant Se4" Y *N;olution status
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.Walkdown attributes (continued)
Presence of mechanical fhsteners and compliance with space rules a Presence of surface voids (unacceptable) Presence of surface defaminations (unacceptable) Adequacy of civil support systems Protection of mechanical fasteners and civil supports a Water damage and the need to use a protective coating Need for weep holes (junction boxes) a Document the acceptability of single conduits > 3 inches Initiate minor maintenance documents to correct minor deficiencies Document required upgrades to be made Verify constructability of upgrade configurations 12 i. I e .
l 4 i - l ( ) Sequoyah Nuclear Plant l I i . i i i l; Additional Thermo-Lag Application ' 13 i: I e r
j . Sequoyah Nuclear Plant i i Additional Thermo-Lag Application t Training Requirements
- Engineering '
l Design Standard (Documented Proficiency Testing) ! General Construction Specification (Documented Proficiency Testing) l ~
- - Insulators, Craft, and Quality Control ,
General Construction Specification (Doc'u mented Proficiency i Testing) Use WBN-qualified and Omega-qualified as lead New insulators
- Sensitive Equipment / Activities Training 4
14 i. I l . _ _ _ _ _ . _ _ _ _ - _ _ _ _ _ _ _ __________________m_ _ _ _ _ _ _ _ _ _ _ . _ . _ _ _ _ _ . _ _ . _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ . _ _ - . - _ _ _ _ . _ _ . _ _ . _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ , * . - . r = _ _ _ _ _ _ ____-_
Sequoyah Xuclear Plant ' Additional Thermo-Lag Application Projected Application Rate Watts Har Sequoyah OTY MilRS UNIT RATE OTY MHRs (JNIT RATE (Estimate)* *
- Install TSI on Cable Tray Raceway 148LF 6841 43.8 N/A N/A N/A Remove / Install TSI on Cable Tray Raceway 289LF 22317 77.2 60LF 5400 90 Install TSI on Junction Boxes 25EA 3075 123.0 N/A N/A N/A Remove / Install TSI on Junction Boxes 2EA 964 482.0 10EA 5000 500 Remove / Install TSI on Junction Boxes 4EA 507 126.8 N/A N/A N/A Install TSI on Conduit Raceway
- 4675LF 44832 9.6 2750LF 41250 15 Remove / Install TSI on Conduit Raceway *
- 482LF 20893 43.4 2705LF 135250 50 Install TSI on Conduit Raceway (Annulus) 535LF 3450 6.5 N/A N/A N/A Install Fire Barrier Wrap 667LF 4726 7.1 N/A N/A N/A Firewrap Removal 22404 N/A N/A N/A 3M Firewrap Removal 3661LF 14483 4.0 N/A N/A N/A 3M Firewrap Removal 48 . N/A N/A N/A Raceway Work Release Support 6119 6750 Remove TSI on Conduit Raceway N/A N/A N/A 606LP 6060 10 Remove TSI on Enclosures N/A N/A N/A 538SF 5380 10 Direct Total 150299 205090 Work Support @ 30% of Direct (Scaffold erection / removal) 45090 61527 Training / Certification @ 10% of Direct & Work Support 19539 26662 Thermo-Lag upgrades for SQN
** Kaowool removal for SQN "* SQN estimate based on WBN unit rate 15 b NOTE: WilN unit rate reflects single-unit plant under construction; SQN estimated unit rate isfor a two-unit operating pl nt.
Sequoyah Xuclear Plant
- Additional Thermo-Lag Application
} Modifications Are Prioritized by Fire Area i l - Risk-Based 3 Compartmentation i Combustible loading a f Ignition sources a l Fire safe shutdown equipment location . i 2 i i i i 16 i: I
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4 l Sequoyah Nuclear Plant Additional Thermo-Lag. Application j Modifications Are Prioritized by Fire Area (cont.) l . - Scaffolding will have to be constructed around sensitive equipment a RCP undervoltage and underfrequency relays Steam generator pressure transmitters a 120V AC vital instrument power boards . '- a , 125V DC vital battery boards 6.9kV shutdown boards Component cooling water pumps a , 480V MOV boards a j 6900V/480V shutdown transformers i Reactor trip switchgear
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t Qtr 3.1997 j Otr 4,1997 Qtr1,1998 Otr2.1998 K) TaskName Duration Start Finish Mar l Apr l May l Jun l Jul l Aug Sep l Oct l Pkw Dec l Jan l Fen Mar 1 wandwns 90d 3/28/97 7/31/97 l-gm g q - 2 Thamotag Renaal : 110d 4/28/97 Of26/97 . g g- ;;] 3 Design Complete 1d 900/97 9/30/97 f $ DesignCoe e 4 cuawicaton compiece(2130i 1d 9/30/97 900/97 . j, j $ Qualmcation Complete (2130 LF 3"& 4") a :- : Priority 1 Areas 121d 1W15/97 41198 I { { 1, Priority 1 Areas I 6 FAM)86 120d 10/15/97 3/31/98 . j- !
- l FAA-084 7 :
FAM)69 . 32d 10/27/97 12/9/97 j {* [pgggq) j a FAA m 120d 10/15/97 3f31/98 !* ! [p g s : FAM)S7 32d 12/9/97 1/21/98 ' j-
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12 FAM)74 25d 2/10/98 3/16/98 {j j j lyA4 gyf 13 FAA-004 :* : 20d 3/5/98 4 1/98 ** 14 Priority 2 Areas 132d # 1/98 10f1/98 l- , j j j sl. is FAM)01 32d 41/98 5/14/98 {; j i l is FAM)99 32d N27/98 6/9/98 3: : : 17 FAM329 132d #1/98 10/1/98 j; j [ , is FAM331 32d 6f2/98 7/15/98
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Qtr3,1997 Qtt4.1997 Qtr1.1998 Otr2.1998 10 TaskName Duration Start Finish Mar l Apr l May Jun l Jul l Aug Sep l Oct l Now Dec l Jan l Feb Mar ,
, 21 Priority 3 Areae 175d- 10f2/98 81319 9 j ,
22 FAA429 175d 10/2/98 &3/99 ll . 23 FAA-101 32d 10/2/98 11116/98 ::
- 24 FAA-074 110d 10f26/98 3/26/99 l- , ,
2s FAA-108 :2d 11/9/98 12/22/98 :. : ii : : 26 FAME 8 32d 12/14!98- 1126/99 i: i . 27 FAA-061 32d 1/18/90 3/2/99 ! ! ' 28 Final Report 45d 4/26/99 6/25/99 j' : 2s Kaonoal Rardwwnent 238d 10ft/98 8/30/99 , ! : f.i. . . . s Task lll !!l Smynary I)- l) Rceed Up Progress Prgect . meg 7 Progress - Rosed Up Task l j. !!!-i: pl IAlestone h RoNed Up reisstme (Y Page 2 ,
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l Sequoyah Nuclear Plant Summary . 18 i. 1
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t Sequoyah Nuclear Plant Summary Schedule has been developed consistent with the safe operation of the plant and the safety significance of the Thermo-Lag upgrade
- Existing plant fire protection system consists of:
Detection Suppression Compartmentation . a . Fast response fire brigade a Compensatory measures Existing Thermo-Lag is qualified for a minimum of 40 minutes for single conduit runs Thermo-Lag upgrade is properly sequenced with respect to our material condition, regulatory, and reliability plant improvements
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i . v s
Sequoyah Nuclear Plant Thermo-Lag Major Milestone Ssmmary Non-required Thermo-Lag Thermo-Lag Thermo-Lag Thermo-Lag removed Upgrade of Upgrade of Upgrade of Sept 1997 Priority 1 Areas Priority 2 Areas Priority 3 Areas Complete - April 1998 ' Complete - Oct.1998 Complete - May 1999 rsh y Accept 3" and greater Thermo-Lag following g w walkdowns (2100 feet) y Sept.1997
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y . Upgrade Design Complete Sept.1997 l i I I I l I l 6 9 12 3 6 9 12 3 4 97 l 98 l 99 TIME i; i
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