ML20235L849
| ML20235L849 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 02/15/1989 |
| From: | Moran D Office of Nuclear Reactor Regulation |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| TAC-62260, NUDOCS 8902280005 | |
| Download: ML20235L849 (28) | |
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papuf* s UNITED STATES dP [ g
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g NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 205S5 February 15, 1989 Docket Nos. 50-259/260/296 LICENSEE: Tennessee Valley Authority FACILITY: Browns Ferry Nuclear Plant, Units I, 2 and 3
SUBJECT:
FEBRUARY 1, 2, 3 AND 6, 1989 HEETING WITH TVA TO ASSESS THE ELECTRICAL CABLE INSTALLATION AND AMPACITY ISSUES AND ACTION PLAN FOR CLOSURE On February 1, 2 and 3, the ADSP staff met with TVA at the Browns Ferry site to discuss electrical cable installation and arfacity issues. The meeting was continued the following Monday, February 6,1989 at One White Flint North in Rockville, Maryland to close the discussion of ampacity. The attendance rosters are Enc'osure 1. On February 1, 1989, the meeting consisted of a discussion of TVA's method for assessing cable separation problems and TVA's proposed corrective action. TVA had been asked to review the groupings of' cables for which adequate separation must exist. TVA had not progressed sufficiently to provide exhaustive quantitative information at that time. For example, it is necessary to detertnine the total number of cables requirf ng a verification that the separation is adequate. This meeting produced a tist of major items (Enclosure 2) which TVA is to accomplish as part of the resolution of the cable separation issue. On February 2,1989, the meeting on empacity covered a review by TVA of their current effort at Browns Ferry Nuclear Plant, (BFN) Unit 2. The agenda and TVA handouts are contained in Enclosure 3. The ampacity program status is shown below: V review - complete; 1300 cables were reviewed, no failures in this group 3 V,V - 66% complete 29 failures to date 4 5 - scheduled to finish February 1989 V,V - walkdowns complete 4 5 - analysis performed
- final calculations - March 31, 1989
- 117 failures Calculations - Software QA finished February 28, 1989
- Completion - end of March 1989 8902280005 890215 /
ADOCK 05000259 f8' PDR p FDC ,
{ \ < TVA stated that it expects to save 60 to 65 cables by use of the diversity concept. The ampacity data base information can be used in resolving the cable separation issue. l l On February 6,1989, the ampacity meeting was continued at One White Flint l North. The agenda is contained in Enclosure 4. This ineeting was devoted to resolving the 60 C EQ limitation placed on certain BFN cables. BFN has approximately 40 cables rated between 60 C and 90 C. TVA explained their testing criteria for determining the actual temperatures which the 60*C and 90"C cables will see during accident scenarios. The time frame (time . l temperature duty cycles) during the scenario was also presented to the staff. TVA's ampacity resolution effort is scheduled for completion at the beginning of April 1989. j The NRC staff ir,spected and is in general agreement with TVA's position on how the 2ES320-Z cable was damaged during installation. TVA will provide a subraittal to document this damage and to document the resolution of this ! concern as presented to che staff in the January 19, 1989 meeting. Q avid . ora. ProjeRT!! macer TVA Projects Division Office of Special Projects
Enclosures:
- 1. Attendance Lists
- 2. Major Items To Be Accomplished
- 3. Meeting Objectives
- 4. Cable Ampacity Meeing - February 6 cc w/ enclosures:
See next page DISTRIBUTION Docket FITT NRC PDR Local PDR Those on Attached List
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OFr. :NRR:TV% A : NP. :TVA: AD/P : : : : NAME :M .s : n:as :SB k : : : : DATE j /l /89k_______::_2/ /89 :2/ h/8' : : : :_ 0FFICIAL RECORD COPY _ _ _ _ _ _ ~
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V ,: ENCLOSURE 1 FEBRUARY'1, 1989- . ELECTRICAL CABLE SEPARATION n Name Organization. 4
.TVA' David Skridulis NRC' Hukam Garg NRC Angelo Marinos J,.D. Collins NE NE J. D. Hutson NE Jeff Rinne NE
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F ENCLOSURE 1 FEBRUARY 2. 1989 AMPACITY EVALUATION' Organization f Name TVA Art ' Alford Bechtel John Rommel Brian F. Reagan NE Masoud Bajestani TVA NE Kent W. Brown Sandia Vernon F. Nicolette Sandia L Mark J. Jacobus- NRC Hukam C. Garg. NRC Angelo Marinos. NE J. H.-Rinne NE J.'O. Hutson .I a i i
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' ENCLOSURE 2 MAJOR ITEMS TO BE ACCOMPLISHED FEBRUARY 1. 1989 CABLE SEPARATION l
Need to establish that the evaluation groups are separate non-related
- 1. ]
groups such that statistical approach can be utilized.
- 2. Exclusion of the V3 safety-related cables from the evaluation is of concern and needs to be justified.
- 3. NRC will evaluate TVA's statistical methodology when it is worked out.
(Formula and acceptance criteria).
- 4. TVA will perform additional review of drawing discrepancies and evaluate against the basic sepa;ation criteria in order to justify the 95%
confidence level in the cable and conduit data base.
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- l ENCLOSURE 3 AMPACITY MEETING OBJECTIVES FEBRUARY 2, 1989 4
MEETING OBJECTIVES.- 4
- AMPACITY STANDARDS
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- BFN CABLE SIZING
- REVIEW 0F CURRENT EFFORT 4
NPK2 - 5930W w_________________________ . _ _ _ _ ._ _ _ _ _ . __ __ . _ _ _ _ _ ___ _ _ _ _ . _ _ - _ _____ _ _ _ _ - _ _ _ ._ _ _ _ _ _ _ - - _ _
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-5 AMPACITY PROGRAM STATUS
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V3 REVIEW - COMPLETE (1300 CABLES REVIEWED) .
- NO FAILURES V,V54 CONDUIT - 66% COMPLETE
- 29 FAILURES TO DATE
-~ FINISH 2/89 (100% REVIEW)
V 4 ,1V5 TRAY - WALKDOWNS COMPLETE
- ANALYSIS PERFORMED BUT NOT CHECKED
- FINAL CALC 3/31
- 117 FAILURES CALCULATION SOFTWARE - FINISH QA 2/28 PROGRAMMATIC CONTROLS NPK2 - 5969W
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y. DERATING FACTORS ADDED TO TVA STANDARDS
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- MIXED INSULATION RATINGS
- APPENDIX R COVERINGS
- CABLE DIAMETERS ,
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DEPTH OF 30% FILL ACTUAL DEPTH
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.g L - ACTUAL LOADS I - REVISED' MULTIPLIERS
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- OVERLOADED CABLE SIZES
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f DIVERSITY 0 100 = W100 A (W W = ACT IF UNIFORM: QACT = WACT A HEAT CAPACITY MARGIN AQ=Q100 - QACT QM AX = Q1 00 + 6 Q (IDEAL) NPK2 - 5930W
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" HEATING 6 VS DIVERSITY' 3
DIVERSITY 'C
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TRAY NODE HTNd6 *C , 57-92 2FS-ESII. '2 9.. 11 58 93 2FS-ESII-3 64 78 2HO-ESII-6 64 >150
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-2AQ-ESII 15 59 69 2AQ-ESII 2 58 69 2GU-ESII.
O i . c NPK2 - 5969W I _Mb__._-_I.____________._________-.______._..___________________.________._.__-_._._______ _ _ _ _ _ _ _ _ _ _ _ _ _ . . _ _ _ _ _ _ _ _ _ _ . _ . . _ _ . _ _ _ _ _ _ . _ _ _ _ . _ _ . _ _ . _ _ _ _ _ _ _ _ _ _ _ _ _ _ . _ _ _ . _ _
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.FLAMEMASTIC PROGRAM
' THICKNESS TEST CALCULATION 1.00 l'.00' l.00 0.00" 1.00 - 'l.00 0.25" 0.92 0.91 0.91 O'.50" 0.90 - 0.90 0.75" l 0.87 0.86 0.86
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.1.50" 0.83 0.83 0.83 0.83
'1.75" 0.82 - 0.82 2.00" 1 2.50"- -0.80 - 0.80 3;00" 0.78 - 0.78 y
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CONCLUSIONS , 1 SOME BFN CABLES UNDERSIZED
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1% APPROXIMATELY efe CABLES BEING REPLACED DIVERSITY MODEL PROVIDES ADEQUATE LEVEL OF MARGIN-AMPACITY TESTING PROVIDES REASONABLE ASSURANCE NPK2 - 5969W
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l @;![$g' 3[,.* yis6"= ,1 +ew \. ; b0# p.ch e ENCLOSURE 4 CacLt aemat.iiY i i 39 j aq p ' -j-FEBRUARY,6, 1989
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e 1[hy, ( s ,ti .- CABLE AMPACITY , l PURPOSE l RESOLVE 60 C EQ LIMITATION l APPROACH REPLACE THREE HARSHEST AREAS
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REMAINING AREAS GENERIC' ANALYSIS XLPE
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o Literature Search i l o Review Test Data o Purchase Specifications vs Industry Standards 1 i
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. Browns Ferry Nuclear Plant CC' . .
Regional Administrator, Region II General Counsel . U.S. Nuclear Regulatory.Comission - ~j Tennessee Valley Authority 101 Marietta Street, N.W. 400 West Summit: Hill Drive. Atlanta, Georgia 30323
, Ell 833 Knoxville, Tennessee 37902 ~ Resident Inspector / Browns Ferry NP U.S. Nuclear Regulatory Comission Mr. R.lL. Gridley . .
Route-12, Box 637 i
~ Tennessee Valley Authority Athens, Alabama 35611
~ SN 1578 iookout Place .
Chattanooga, Tennessee 37402-2801 Dr. Henry Myers. Science Advisor Mr. C. Mason Comittee on Interior Tennessee Valley Authority Browns Ferry Nuclear Plant and Insular Affairs. U. S. House of Representatives P.O. Box 2000 Washington, D.C. 20515 Decatur,' Alabama 35602 Tennessee Valley Authority Rockville Office Mr. P.-Carier . 11921 Rockville Pike-
' Tennessee Valley Authority Browns Ferry Nuclear Plant Suite 402 Rockville, Maryland P.0852 P.O. Box 2000
,; .Decatur, Alabama 35602 Mr. Oliver D. Kingsley, Jr. i Senior Vice President. Nuclear Power Hr. D. L'. Hilliams' Tennessee Valley Authority Tennessee Valley Authority 6N.38A Lookout Place 400 West Sumit Hill' Drive 1101 Market Street W10 B85 . Chattanooga, Tennessee 37402-2801 Knoxville, Tennessee 37902 Chairman, Limestor e County Comission P.O. Box 188 Athens, Alabama 3501 e Claude Earl Fox, M.D. l State Health Officer State Department of Public Health - State.0ffice Building Montgomery, Alabama 36130
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DISTRIBUTIONFORMEETING
SUMMARY
_ DATED: February 15, 1989 1 Facility: - Browns Ferry Nuclear Plant, Units 1, 2. and 3* I 1
<xCDocket? File,, I NRC PDR
' ' l Local PDR' Projects Reading ADSP. Reading
'D. Crutchfield .
B. D. Liaw j S. Black ' R.: Pierson D. H. Moran' G. Gears M. Simms F.-McCoy RII ' 15-B-18 J. Rutberg i H. Garg L l A. Marinos ACRS(10) GPA/PA 2-G 5 7 GPA/CA 16-G-19
- 5. Vargt 14-E-4 E. Jorden MNBB-3302 B. Grimes 9-A-2 P. Gwynn .
16-H-3 J. Scarborough 16-H-3 G. Marcus 16-H-3 T. Elsasser 16-H-3 4 16-G-15 L. Norrholm C. Ader 16-H-3
'BFN Rdg. ?fle'
*cc: Licensee / Applicant & Service List i
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