ML20150C348
| ML20150C348 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 03/11/1988 |
| From: | Moran D NRC OFFICE OF SPECIAL PROJECTS |
| To: | NRC OFFICE OF SPECIAL PROJECTS |
| References | |
| TAC-62260, NUDOCS 8803180175 | |
| Download: ML20150C348 (22) | |
Text
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i March 11, 1988 Docket No. 50-260 LICENSEE: Tennessee Valley Authority (TVA)
FACILITY:
Browns Ferry Nuclear Plant, Unit 2 (BFN)
SUBJECT:
SUMMARY
OF FEBRUARY 29, 1988 MEETING WITH TVA DEALING WITH BFN UNIT 2 RESOLUTION OF CONCERNS ON ELECTRICAL CABLE AMPACITY i
The neeting convened at 1:30 p.m.
The list of attendees is Enclosure 1.
The afterncon meeting was for the purpose of providing the staff with the BFN criteria for resolution of ampacity concerns.
The meeting agenda and viewgraphs sumarizing the content of BFN's presentation are Enclosure 2.
Resolution of ampacity concerns involves a three phase program.
Phase I is the same approach used for Sequoyah (Enclosure 2 Item 5 of "Problem Solution and Status").
Phases II and III nust be evaluated. All cables detemined unacceptable in Phase I will be evaluated in Phase II i
(Enclosure 2, Item 7 of "Problem Solution end Status").
Cables failing Phase Il evaluation are evaluated according to the criteria in Phase III (Enclosure 2, Item 7 of "Problem Solutinn and Status").
The BFN proposed schedule is laid out on the last page of Enclosure 2.
After discussion with the staff it was agreed that a final schedule will be firmed l
up in mid March 1988.
Original Signed by i
David H. Moran, Project Manager i
TVA Projects Division i
Office of Special Projects
Enclosures:
As stated l
cc w/ enclosures:
1 See next page DISTRIBUTION 8803180175 080311 Docket File PDR ADOCK 05000260 i
NRC PDR P
PDR l
Local PDR Those on attached list 7
f OSP:TVA/L 05 l (AD/P CJamerson ohs n.Jg GZech 3/0/88 y/j/88 3 /(\\ /f.8 i
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DISTRIBUTION FOR MEETING SUFMARY DATED: March 11, 1988 Facility:
Browns Ferry Nuclear Plant. Unit 2*
. Docket File.
NRC PDR Local PDR Projects Reading S. Ebneter J. Axelrad S. Richardson G. Zech B. D. Liaw K. Barr G. Gears D. Moran C. Jamerson A. Ignatonis OGC J. Rutberg F. Miraglia E. Jordan J. Partlow A. Marinos ACRS(10)
Hon. M. Lloyd Hon. J. Cooper Hon. D. Sundquiest Hon. A. Gore Dr. Henry Myers Mr. R. King, GAO P. Gwynn J. Scarborough G. Marcus C. Miller T. Elsasser C. Ader TVA-Pockville Browns Ferry Reading
- Copias sent to those persons on facility service list.
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Tennessee Valley Authority Browns Ferry Nuclear Plant Unit 2 i
CC*
General Counsel Regional Administrator, Region !!
Tennessee Valley Authority U.S. Nuclear Regulatory Comission 400 West Sumit Hill Drive 101 Marietta Street, N.W.
E11 B33 Atlanta, Georgia 30323 Knoxville, Tennessee 37902 Resident Inspector / Browns Ferry NP Mr. R. L. Gridley U.S. Nuclear Regulatory Comission Tennessee Valley Authority Route 12, Box 637 SN 1578 Lookout Place Athens, Alabama 35611 Chattanooga, Tennessee 37402-2801 Mr. Richard King Mr. H. P. Pomrehn c/o U.S. GA0 Tennessee Valley Authority 1111 North Shore Drive Browns Ferry Nuclear Plant Suite 225, Box 194 P.O. Box 2000 Knoxville, Tennessee 37919 Decatur, Alabama 35602 Dr. Henry Myers, Science Advisor Mr. M. J. May Comittee on Interior Tennessee Valley Authority and Insular Affairs Browns Ferry Nuclear Plant U.S. House of Representatives P.O. Box 2000 Washington, D.C.
20515 Decatur, Alabama 35602 Mr. S. A. White Mr. D. L. Williams Manager of Nuclear Power Tennessee Valley Authority Tennessee Valley Authority
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400 >!est Sumit Hill Drive 6N 38A Lookout Place r
W10 B85 1101 Market Street Knoxville, Tennessee 37902 Chattanooga, Tennessee 37402-2801 i
Chairman, Limestone County Comission P.O. Box 188 Athens, Alabama 35611 Claude Earl Fox, M.D.
State Health Officer l
State Department of Public Health State Office Building Montgomery, Alabama 36130 1
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i ENCLOSURE 1 AMPACITY PRESENTATION FEBRUARY 29, 1988 NAME ORGANIZATION PHONE Art Alford BFN - Site Licensing M. J. May BFN - Licensing (205)729-5014 i
Paul Speidel BFN - PE (205)729-50.14 i
C. C. Mason TVA - ONP (615) 751-2742 J. T. Grille Ebasco - BFN (205)7C9-4148 Daivd H. Moran NRC PM for BFN (301)492-0766 Jack D'Agostaro Ebasco - BFN (205) 729-4226 Angelo Marinos NRC/OSP (301) 492-3317 Brian E. Reagan BFEP (615)632-8793 T. A. Ippolito TVA (301) 770-6790 M. J. Ray TVA (615)751-2726
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Gerry Gears NRC/OSP (301)492-0167 i
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l TENNESSEE VALLEY AUTHORITY BROWNS FERRY NUCLEAR PLANT UNIT 2 RESOLUTION OF CONCERNS ON 3
I ELECTRICAL CABLE AMPACITY l
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PRESENTED TO THE U.S. NUCLEAR REGULATORY ' COMMISSION 3
,2, i
BETHESDA, MARYLAND 1
l FEBRUARY 29, 1988 r
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AGENDA MEETING BETWEEN TVA AND NRC ELECTRICAL CABIE AMPACITY j
r I.
PROBLEM IDENTIFICATION l
11.
PROBLEM DESCRIPTION i
III. PROBLEM SOLUTION AND STATUS A.
REVISED ELECTRICAL DESIGN STANDARD
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B.
EVALUATION PROGRAM 1.
PURPOSE 2.
IMPLEMENTATION i
3.
RESULTS 4.
INTERFACES j
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SCHEDULE DNE4 - 1286W
t THE FOLLOWING VOLTAGE.EVEL DEFINITIONS APPLY AS USED IN THIS
.RESENTATION AND DS-E12.6.3:
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i V3 - AUXILIARY AND CONTROL AC AND DC POWER CABLES OPERATING AT A VOLTAGE OF UP TO 277V AND A CURRENT OF LESS THAN 30 1
AMPERES.
V4 - AUXILIARY AC AND DC POWER CABLES OPERATING AT A VOLTAGE UP TO 600V.
THIS INCLUDES CABLES OF 277V OR LESS WITH A RATED LOAD CURRENT OF 30 AMPERES OR GREATER.
i V5 - MEDIUM VOLTAGE AUXILIARY POWER CABLES WITH A NOMINAL RATED VOLTAGE OF 5, 8, OR 15 KV.
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1 1
1 1
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l EgQaiEM IDENTIFICATION i
A.
INDEPENDENT AND TVA CONDUCTED AUDITS 1.
INP0 FINDING, MARCH 1984 2.
TVA BELLEFONTE ELECTRICAL EVALUATION TEAM FINDING,
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JAN0ARY 1985 3.
NUCLEAR SAFETY REVIEW STAFF (NSRS) REPORT, MARCH 1986
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TVA PROBLEM IDENTIFICATION REPORT 1.
PIRGENEEB8605 APPROVED 8/7/86 C.
TVA EMPLOYEE CONCERNS EVALUATION PROGRAM
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1.
ELEMENT 240.0, CABLE DERATING (DESIGN) AND CABLE f
C0ATING DERATING DNE4-2142W 1
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PROBlFM DESCRIPTION A.
SPECIFIC AREAS OF CONCERN:
ADDRESSED IN ADDRESSED IN ORIGINAL STANDARDS REVISED STANDARD l
PARAMETER (DS-E12.1.1.4)
(DS-E12.6.3)
THE NUMBER OF CURRENT No YES CARRYING CONDUCTORS IN A CABLE ROUTED IN TRAY AN INCREASED DEPTH OF No YES CABLE IN RANDOMLY FILLED TRAYS CHANGE IN THE CABLE No YES DIAMETER IN RANDOMLY FILLED TRAYS THE GROUPING OF CONDUITS No YES THE NUMBER OF CURRENT No YES r
CARRYING CONDUCTORS IN THE CONDUIT C/BLES.0F DIFFERENT No YES INSULATION TEMPERATURE i
RATINGS ROUTED IN THE SAME RACEWAY DERATING EFFECTS OF FIRE No YES RETARDANT CABLE COATINGS, TRAY COVERS, AND BOTTOMS AND APPENDIX R FIRE WRAP l
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4 PROBLEM DESCRIPTION (CONTINUED)
B.
MAGNITUDE OF POTENTIAL DISCREPANCIES:
PRIMARILY REDUCTION AFFECTS PARAMETER FACT 6R VOLTAGE LEVEL THE NUMBER OF CURRENT g3/N V3, V4 CARRYING CONDUCTORS IN A CABLE ROUTED IN TRAY AN INCREASED DEPTH OF AMPACITY @ 30% 4" =.83 V4 CABLE IN RAND 0MLY FILLED AMPACITY @ 30% 3" TRAYS CHANGE IN THE CABLE I
=dX I
V3, V4 X
o DIAMETER IN RANDOMLY d
o FILLED TRAYS THE GROUPING 0F CONDUITS 6 x 1 MATRIX =.86 V4, V5 THE NUMBER OF CURRENT 4-6 CONDUCTORS =.80 V4 CARRYING CONDUCTORS IN THE 43 AND ABOVE
=.50 CONDUIT CABLES OF DIFFERENT 90
> 750=.86 V4 0
0 INSULATION TEMPERATURE 90 -+ 600=.66 RATINGS ROUTED IN THE SAME RACEWAY DERATING EFFECTS OF FIRE CABLE C0ATING
=.913 V4, V5 RETARDANT CABLE C0ATINGS, TRAY COVER
=.75 TRAY COVERS, AND BOTTOMS TRAY BOTTOM
=.89 AND APPENDIX R FIRE WRAP TRAY COVER & BOTTOM =.66 3-M APPENDIX R WRAP CONDUIT
=.625 3-M APPENDIX R WRAP TRAY
=.44
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i PROBLEM SOLUTION AND STATUS 4
A.
REVISED ELECTRICAL DESIGN STANDARD (DS-E12.6.3) 1.
BASIS OF THE REVISED STANDARD (CALCULATION EEB-CSTF-0001 )
l CABLES INSTALLED IN AMPACITY BASIS l
CONDUIT IPCEA P-46-426 NEC ARTICLE 310 (1987)
TRAY (RAND 0MLY FILLED) V3, V4 ICEA P-54-440 IEEE 70 TP 557 PWR TRAY (MAINTAINED SPACING) V5 IPCEA P-46-426 2.
TVA SPECIFIC INSTALLATION CONFIGURATIONS CABLES INSTALLED IN AMPACITY BASIS FIRE PROTECTIVE CABLE COATINGS JOSLYN RESEARCH CENTER TEST REPORT FACTORY MUTUAL TEST REPORT TRAY COVERS AND/0R BOTTOMS 3M CORPORATION SPONSORED TEST REPORT IEEE TRANSACTION 83SM305-0 APPENDIX R FIRE WRAP 3M CORPORATION SPONSORED TEST REPORT THERMAL SCIENCES, INC., SPONSORED TEST REPORT DNE4 - 2140W i
4 PROBLEM SOLUTION AND STATUS (CONTINUED) 3.
INDEPENDENT TECHNICAL REVIEW A.
THE_ STANDARD WAS DEVELOPED UTILIZING TVA AND INDUSTRY EXPERTISE.
B.
THE METHODOLOGY HAS BEEN REVIEWED AGAINST, AND FOUND TO BE IN ACCORDANCE WITH, THE STANDARDS OF SEVERAL ARCHITECT / ENGINEERS.
C.
THE STANDARD WAS REVIEWED AND FOUND ACCEPTABLE AS PART OF THE EMPLOYEE CONCERNS PROGRAM.
4.
IMPLEMENTATION OF THE REVISED STANDARD A.
THE SELECTION OF NEW POWER CABLE SIZES UTILIZING DS-E12.6.3 IS REVIEWED FOR ALL NUCLEAR PROJECTS BY THE TVA ELECTRICAL ENGINEERING BRANCH PERSONNEL WHO DEVELOPED THE STANDARD.
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PROBtEM SOLUTION AND STATUS (CONTINUED)
B.
EVALUATION PROGRAM 1.
PURPOSE A.
DETERMINE THE OPERATIONAL ADEQUACY OF PREVIOUSLY INSTALLED SAFETY-RELATED AND ASSOCIATED ELECTRICAL POWER CABLES WITH RESPECT TO AMPACITY B.
B0UND ANY IDENTIFIED PROBLEMS C.
CORRECT ALL IDENTIFIED DEFICIENCIES D.
PROVIDE COMPLETE, AUDITABLE DOCUMENTATION m
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1 PROBLEM SOLUTION AND STATUS (CONTINUED) 2~.
IMPLEMENTATION A.
ESTABLISHED A SEPARATE ENGINEERING GROUP WITHIN THE ELECTRICAL ENGINEERING PROJECT TO CONDUCT THE EVALUATION SAMPLING PROGRAM.
B.
BROWNS FERRY TASK INSTRUCTION TI-E110-0, "PREPARATION OF CABLE DERATING CALCULATION"
- 1. DEFINED INSPECTION LOTS (A) V3 LEVEL CABLES ROUTED IN TRAY (B) V3 LEVEL CABLES ROUTED IN CONDUIT WITHOUT APPENDIX R FIRE WRAP (C) V3 LEVEL CABLES ROUTED IN CONDUITS WITH APPENDIX R FIRE WRAP (D) V4 LEVEL CABLES ROUTED IN TRAY WITHOUT TRAY COVERS, BOTTOMS OR APPENDIX R FIRE WRAP (E) V4 LEVEL CABLES ROUTED IN TRAY WITH TRAY COVERS AND/0R BOTTOMS AND/OR. APPENDIX R FIRE WRAP (F) V5 LEVEL CABLES ROUTED IN TRAY WITHOUT TRAY COVERS, BOTTOMS OR APPENDIX R FIRE WRAP.
(G) V5 LEVEL CABLES ROUTED IN TRAY WITH TRAY COVERS, AND/0R BOTTOMS AND/0R APPENDIX R FIRE WRAPS (H) V4 AND V5 LEVEL CABLES ROUTED IN CONDUIT WITHOUT APPENDIX R FIRE WRAP (I) V4 AND V5 LEVEL CABLES ROUTED IN CONDUIT WITH APPENDIX R FIRE WRAP
- 2. DETERMINE THE TOTAL NUMBER OF UNITS (SAFETY-RELATED AND NONSAFETY-RELATED CABLES ROUTED WITH SAFETY-RELATED CABLES) IN EACH LOT BASED ON THE MOST LIMITING RACEWAY CONFIGURATION FOR AMPACITY DNE4 - 1306W
i PROBLEM SOLUTION AND STATUS (CONTINUFD)
- 3. A.
PERFORM A 100-PERCENT EVALUATION OF THOSE INSPECTION LOTS WHICH A REVIEW OF THE ORIGINAL PROBLEM AND THE SEQUOYAH EXPERIENCE INDICATES HAVE THE GREATEST POTENTIAL FOR AN UNACCEPTABLE QUALITY LEVEL.
THIS INCLUDES INSPECTION LOTS D, E, F, AND G.
B.
PERFORM A SAMPLING INSPECTION OF THOSE INSPECTION LOTS WHICH A REVIEW 0F THE ORIGINAL PROBLEM AND THE SEQUOYAH EXPERIENCE INDICATES HAVE THE LEAST P0TENTIAL FOR AN UNACCEPTABLE QUALITY LdVEL.
SAMPLES WILL BE SELECTED ON A RAND 0M BASIS IN ACCORDANCE WITH AN INDUSTRY ACCEPTED SAMPLING PROGRAM T0 t
PROVIDE 9S PERCENT RELIABILITY WITH 9S PERCENT CONFIDENCE.
THIS INCLUDES INSPECTION LOTS A, B, C, H, AND I.
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PROBLEM SOLUTION AND STATUS (CONTINUED)
- 4. PERFORM A 100-PERCENT WALKDOWN OF THE INSTALLED CONFIGURATION FOR THE RACEWAY SECTION(S) IN WHICH THE CABLES ARE BEING EVALUATED.
BROWNS FERRY TASK INSTRUCTION TI-E036-01 CAELE/ RACEWAY WALKDOWN
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IBM (A)
IDENTIFY DEPTH AND WIDTH OF CABLE AND FLAMEMASTIC (B)
IDENTIFY EXISTENCE AND LOCATION OF TRAY COVERS AND/0R BOTTOMS
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(C)
IDENTIFY EXISTENCE OF ABANDONED CABLES (D)
CONFIRM LOCATION OF APPENDIX R WRAP (E)
IDENTIFY IF CABLES PASS THROUGH FIRE STOP OR PRESSURE SEAL (F)
IDENTIFY WHETHER ALL CABLES ARE COVERED BY FLAMEMASTIC.
(G)
SKETCH TRAY FILL g
f CONDUIT t^
(A) LOCATION (BUILDING, ELEVATOR, ROOM)
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4 (B) CONFIRM LOCATION OF APPENDIX R WRAP (C) IDENTIFY EXISTENCE AND SPACING OF ADJACENT CONDUITS DNE4 - 1306W-
PROBLEM SOLUTION dND STATUS (CONTINUED)
- 5. EVALUATE SAMPLES IN STRICT ACCORDANCE WITH DS-E12.6.3.
THIS "PHASE I" EVALUATION INCLUDES THE FOLLOWING CONSIDERATIONS:
(A) TRAYS AT MAXIMUM 30% FILL, VERIFY NO OVERFILLS (VERIFICATION PERFORMED IN PHASE II)
(B) LOAD CURRENT BASED ON NAMEPLATE OR EQUIPMENT RATING (C) LOAD CURRENT MULTIPLIERS APPLIED PER DS-E12.6.3 (D) FLAMEMASTIC DERATING ASSUMED LINEAR BEYOND 2" DEPTH (CONSERVATIVE)
(E) DERATING FOR INSTALLED TRAY COVERS AND/0R BOTTOMS (F) ALL CABLES DERATED TO LOWEST CABLE INSULATION TEMPERATURE RATING b
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t PROBLEM SOLUTION AND STATUS'(CONTINUED)
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- 6. FOR THOSE INSPECTION LOTS RECEIVING A 100-PERCENT EVALUATION (D, E, F, AND G),
4 CONTINUE UNTIL THE EVALUATION IS COMPLETE.
FOR THOSE INSPECTION LOTS RECEIVING A SAMPLING INSPECTION (A, B, C, H, AND 1),
CONTINUE UNTIL AN ACCEPTABLE QUALITY LEVEL IS ACHIEVED IN EACH LOT OR UNTIL THE LOT IS REJECTED.
ALL CABLES WITHIN A REJECTED LOT WILL HAVE THEIR ADEQUACY WITH RESPECT TO AMPACITY DETERMINED.
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PROBLFM SOLUTION AND STATUS (CONTINUED)
- 7. ALL CABLES WITH AN UNACCEPTABLE AMPACITY RATING FROM "PHASE I" WILL BE EVALUATED IN "PHASE II" AND IF STILL UNACCEPTABLE, "PHASE III."
"PHASE II" INCLUDES THE FOLLOWING CONSIDERATIONS:
i (A) ACTUAL TRAY FILL IF LESS THAN 30%
(B) LOAD CURRENT BASED ON CONNECTED OR RUNNING LOAD (C) LOAD CURRENT MULTIPLIERS REDUCED ON CASE BY CASE EVALUATION (D) ACTUAL FLAMEMASTIC DERATING FOR DEPTHS BEYOND 2" WILL BE DETERMINED BY TEST OR ANALYSIS (E) TRAY C0 VERS / BOTTOMS NOT REQUIRED FOR j
PERSONNEL PROTECTION OR TO MEET LICENSING COMMITMENTS WILL BE REMOVED (F) INSULATION TEMPERATURE RATINGS MAY BE RAISED AB0VE ORIGINAL DESIGN LIMITS AFTER CONSIDERING CABLE LIFE REDUCTION WHILE MAINTAINING QUALIFICATION (G) HEAT TRANSFER CALCULATIONS BASED ON ACTUAL INSTALLED CABLE CONFIGURATION, OR ASSUMED WORST CASE (H) ACIUAL HEAT GENERATED IN THE TRAY (IZR)
PHASE III INCLUDES THE FOLLOWING CONSIDERATIONS:
(A) THE OPERATING DIVERSITY WITHIN A PARTICULAR RACEWAY (B) FREQUENCY AND DURATION OF OPERATION OF A PARTICULAR CABLE (C) P0TENTIAL FOR DEENERGIZING UNIT 1 AND/0R UNIT 3 CABLES TO SAVE, SHORT TERM, UNIT 2 CABLES DNE4 - 1306W
PROBtFM SOLUTION AND STATUS (CONTINUED)
- 3. RESULTS A.
CABLES WITH A REMAINING LIFE OF LESS THAN TWO YEARS AFTER RESTART WILL BE REPLACED PRIOR TO BFN UNIT 2 RESTART.
B.
CABLES WITH A POST RESTART LIFE OF GREATER THAN TWO YEARS BUT LESS THAN THE PLANT DESIGN LIFE WILL HAVE REPLACEMENT SCHEDULES ESTABLISHED AND DCCUMENTED.
C.
CABLES WHICH ARE ADEQUATE FOR THE FULL PLANT DESIGN LIFE WILL BE DOCUMENTED D.
RESTRICTIONS FOR FUTURE CABLE INSTALLATIONS WILL BE ESTABLISHED.
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PROBLEM SOLUTION A'ND STATUS (CONTINUED)
- 4. INTERFACES C0 ORDINATION WITH THE FOLLOWING BFN PROGRAMS / DOCUMENTS WILL BE PERFORMED TO ENSURE ADEQUACY AND CONSISTENCY.
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A.
V0LTAGE DROP ANALYSIS B.
SHORT CIRCUIT AND C0 ORDINATION ANALYSIS C.
APPENDIX R ANALYSIS D.
ENVIRONMENTAL QUALIFICATION PROGRAM E.
BFN NUCLEAR PERFORMANCE PLAN
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F.
BFN FINAL SAFETY ANALYSIS REPORT DNE4 - 1306W
PROBLEM SOLUTION AND SThTUS (CONTINUED)
To ha firked-up iw WM swd, [4 f C.
SCHEDULE FEBRUARY 1988 EVALUATION OF FIRST CABLE THROUGH PHASE I-III COMPLETED MARCH 1988 FIRST ADDITIONAL RACEWAY DESIGN COMPLETED MODIFICATIONS GROUP BEGINS FIRST WORKPLAN MAY 1988 EVALUATION OF LAST CABLE THROUGH PHASES I-III IS COMPLETED JUNE 1988 LAST ADDITIONAL. RACEWAY DESIGN COMPLETED JULY 1988 CALCULATIONS FINALIZED AND FINAL REPORT AND RECOMMENDATIONS ISSUED MODIFICATIONS GROUP COMPLETES LAST WORKPLAN b
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