ML20235V064

Summary of 890216 Meeting W/Util in Rockville,Md Re TVA Statistical Methodology on Electrical Cable Separation. Agenda & List of Attendees Encl

ML20235V064
Person / Time
Site:	Browns Ferry
Issue date:	03/01/1989
From:	Moran D Office of Nuclear Reactor Regulation
To:	Office of Nuclear Reactor Regulation
References
TAC-00493, TAC-493, NUDOCS 8903100023
Download: ML20235V064 (12)

Text

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, ,, .3 g NUCLEAR REGULATORY COMMISSION 5 ij WASHINGTON, D. C. 20555

... . ./ March 1, 1989 Docket Nos. 50-259/260/296 LICENSEE: Tennessee Valley Authority (TVA)

FACILITY: Browns Ferry Nuclear Plant, Units 1, 2 and 3

SUBJECT:

MEETING

SUMMARY

OF TVA PRESENTATION OF CABLE SEPARATION --

STATISTICAL SAMPLING The NRC staff met with TVA on February 16, 1989 in Rockville, Maryland to receive a presentation of TVA's statistical methodology on electrical cable separation. Attachment 1 is the list of attendees and Attachment 2 is a copy of the agenda and handouts.

TVA presented their cable routing evaluation results for the V, and V5 class power cables which determined the adequacy of the data base for these cables.

TVA further suggested that the adequacy of other classes of cable routings .

can be inferred from the investigation of the V4and Y cable evaluation with no further walkdowns required. Thestaffrequiresadditi$nalinformationbefore such determination can be made.

.TVA was left with essentially two options:

Option 1. Justify that the data base of V 3-Vg cables can be used to extrapolate the adequacy of the data base for V3-V3 cables, or Option 2. Evaluate a statistically defensible random sample of V 3-V2 cables and a separate one from V 3 cables.

The written formal report from TVA, documenting resolution of the cable separation issue is expected to include the material outlined in Attachment 2.

Explanation of cable groupings:

TVA has grouped the electrical cable for analytical purposes as follows:

Instrument cables - V1-Y2 Control cables - V 3 Pwer cables - V4-V5 K

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These designations are defined as follows:.

Voltage level V3 . low-level signal cables from thermocouple, strain gages, vibration detectors, thermal converters and resistance temperature detectors (RTDs)

V2 . medium-level signal cables for digital input to and outputs from the computer, instrument transmitters and recorders.

V 3 . low voltage power cable applications typically, 120 VAC or 250 VDC which provide motive and control power for alternating current motors, motor operated end selenoid valves and control power for relays, closing circuits and trip circuits..

'Y 4 ^480 power cable, lighting cabinet feeder cables and

' low voltage power cables carrying 30 amperes or more.

V5 - 4160 V cables.

Original signed by David H. Moran, Project Manager TVA Projects Division Office of Nuclear Reactor Regulation Attachments:-

1. Attendance List .

2. . Drawing Discrepancy L91uation cc w/ attachments:

See next page Distribution Docket File NRC PDR Local PDR Those on Attached List

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. 2-These designations are defined at follows:

Voltage level V3 . low. level detectors, vibration signal cables from converters thermal thermocouple, and strain gages, resistance temperature detectors (RTDs)

V 2 - medium-level signal cables for digital input to and outputs from the computer, instrument transmitters and recorders.

V 3 - 1 w v ltage power cable applications typically, 120 VAC or 250 VDC which provide motive and control power for alternating current motors, motor operated and selenoid valves and control power for relays, closing circuits and trip circuits.

V 4 - 480 power cable, lighting cabinet feeder cables and low voltage power cables carrying 30 amperes or more.

V5 - 4160 V cables.

Original signed by David H. Moran, Project Manager TVA Projects Division Office of Nuclear Reactor Regulation Attachments:

1. Attendance List

2. Drawing Discrepancy Evaluation cc w/ attachments:

See next page Distribution Docket File NRC PDR Local PDR Those on Attached List

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M :TVA: AD/,P  :  :  :

l DFC :NRR:TVA/LA :NRR:TV

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DATE 23 / / /89  : %/ /89 : 5/ / /89  :  :  : :

OFFICIAL RECORD COPY

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Browns. Ferry Huclear Plant.

cc:

General Counsel .

Regional-Administrator, Region II -; '

1 Tennessee Valley Authority U.S. Nuclear Regulatory Comission 400 West Sumit Hill Drive 101 Marietta Street, N.W.

' Ell B33 , Atlanta, Georgia 30323 i Knoxville, Tennessee 37902 i Resident Inspector / Browns Ferry NP l Mr. R. L. Gridley U.S. Nuclear Regulatory Comission- .. j Tennessee Valley Authority' Route 12, Box 637 i 5N-1578 Lookout Place Athens, Alabama 35611 Chattanooga, Tennessee 37402-2801 Mr. C. Mason Dr. Henry Myers, Science Advisor Tennessee Valley Authority Comittee on Interior l Browns Ferry Nuclear Plant and-Insular Affairs P.O.' Box 2000 U. S. House of Representatives  ;

Decatur, Alabama - 3560'. Washington, D.C. 20515 Tennessee Valley Authority j Mr. P. Carier Rockville Office d Tennessee Valley Authority 11921 Rockville Pike Browns Ferry Nuclear Plant Suite 402

.P,0.' Box 2000. Rockville, Maryland 20852 "

Decatur, Alabama 35602 . .

Mr. D. L. Williams Mr. Oliver D, Kingsley, Jr.

Tennessee Valley Authcrity Senior Vice President, Nuclear Group 400 West Sumit Hill Drive Tennessee Valley Authority W10 BB5 6N 38A Lookout Place Knoxville, Tennessee 37902 1101 Market Street Chattanooga, Tennessee 37402-2801

' Chairman, Limestone County Comission P.04 Bcx 188 Athens, Alabama 35611 Claude Earl Fox, M.D.

State Health Officer State Department of Public Health i State Office Building Montgomery, Alabama 36130 l

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DISTRIBUTION ~FOR MEETING

SUMMARY

' DATED- March 1, 1989:

Facility:' Browns . Ferry Nuclear Plant, Units.1,' 2 and 3*

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NRC PDR (h Local-PDR- ,

Projects Reading

ADSP Reading-D. Crutchfield B. D. Liaw S. Black R. Pierson

.D. Moran-

-G. Gears M. Sims F..McCoy J. Rutberg G. Hubbard F5 Paulitz R.'Wescott D. Lurie LA. Marinos T. Rotella ACRS(10) ,

GPA/PA GPA/CA (M. Callahan) (5)

S. Varga E. Jordan B.' Grimes P. Gwynn J. Scarborough' G. Marcus--

T. Elsasser '

L. Norrholm

.C. Ader BFN Rdg. File cc: Licensee / Applicant and Service List l

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.~ . Enclosure 1 s LICENSING MEETING - ATTENDANCE LIST SUD3ECT ELECTAICAL l.SS UES - C'48LG S6 PARA 776N Feb I5 ; t383 '1:Cc _pm DATE TraE NAME (PLEASE PRINT) l ORGANIZATION l MAILSTOP l PHONE NO.

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BROWNS FERRY NUCLEAR PLANT

[ 'IVA/NRC MEETING ELECTRICAL CABLE SEPARATION FEBRUARY 16, 1989 ROCKVILLE, MD PURPOSE

TO RESOLVE THE ISSUES OF CONCERN RESULTING FROM DISCUSSIONS IN THE MEETING ON FEBRUARY 2,.1989.

AGENDA STATISTICAL EVALUATION AND. SAMPLING >EIHODOLOGY JUSTIFICATION FOR SEPARATE NONRELATED CABLE GROUPS JUSTIFICATION FOR EXCLUDING V3 SAFETY-RELATED CABLES FROM EVALUATION 1

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.:..N ELECIRICAL CABLE SEPARATIONS BROWNS FERRY NUCLEAR PLANT FEBRUARY 16, 1989

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PROBLB1 IDENTIFICATION o DRAWING DISCREPANCIES FR031 AMPACITY WALKDOWNS o UNCLEAR CRITERIA FOR CABLES WITH "IE" SUFFIX o NONDIVISIONAL CABLE ROUTED Wim BOE DIVISIONS o NONDIVISIONAL CABLE ORIGINATING FROM DIVISIONAL SOURCE AND THEN ASSOCIATING WIm OPPOSITE DIVISION CABLES o ROUTING OF NONDIVISIONAL CABLE IN DIVISIONAL CABLE TRAY WAS BASED ON CABLE-BY-CABLE AND NOT CIRCUIT o CABLES DESIGNATED AS SAFEIY-RELATED ON Q LIST WITH NO DIVISIONAL SUFFIX PROBLEMS IDENTIFIED BY CAQRs POPULATIONS OF CABLES EVALUATED REPORT POPULATION METHOD SECTION Statistical ,

o Drawing discrepancies from ampacity walkdowns Evaluation 4.1 o Low-voltage and medium-voltage power cables 1005 4.2 from safety sources o Nondivisional low-voltage and medium-voltage Sample 4.3 power cables from non-safety sources o Nondivisional control cables from safety sources 100% 4.4 o Nondivisional contro) cables from non-safety Sample 4.5 sources 4

o Nondivisional medium-level Signal and low-level 100% 4.6 signal cables from safety and non-safety sources (generic) o Cables designated with "IE" suffix 100% 4.7 l

o Nondivisional low-voltage and medium-voltage 1005 4.8 power cables on Q-list o Nondivisional control cables on Q-list Sample 4.9 o Nondivisional medium-level signal and low-level Sample 4.10 ,

signal cables on Q-list l l

s' DRAWING DISCREPANCY EVALUATION o BACKGROUND

- TOTAL 982 V4/V5 CABLES OF CONCERN joo p/M ' [#wue rM/d

- VISUAL'WALKDOWN y A 4t/M. A G-Ae/ /ar/a N M" RESULTED 582 UNKNOWNS

- SIGNAL TRACED 443 CABLES (45% V4/V5 POPULATION) .

- V4/V5 POTENTIAL CABLE ROUTING PROBIStS (::5300) ~2.r7 dg./e M [

EVALUATED 291 CABLES INCLUDES 200 V4/VS CABLES

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- 20% V4/V5 POPULATION REVIEWED o RESULTS

- 13 DISCREPANCIES (93% RELIABILITY /95% CONFIDENCE)

- 0 SAFETY SIGNIFICANT DISCREPANCIES (99% RELIABILITY /

95% CONFIDENCE) o CONCLUSION ESTABLISHED ACCEITABLE LEVEL OF CONFIDENCE IN DATA BASE

- THEREFORE, NO FURTHER REVIEW REQUIRED

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i V4/V5 NON-SAFETY CABLE POPULATION DEFINITION (TYPICAL).

o CABLES FROM SOURCE ALL NONDIVISIONAL o END DEVICES NON-SAFETY o RACEWAYS ENTERING SOURCE NONDIVISIONAL o SOURCES IN= CLOSE' PROXIMITY TO NON-SAFETY TRAYS o INSTALLATION PRACTICES / PERSONNEL TRAINING / SUPERVISION SIMILAR 3

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p, V3 SAFETY CABLES _

o NO' EXISTING CAQs/EfPLOYEE. CONCERNS.'-

o V3 ASSOCIATED CIRCUITS REVIEW CONFIRMED

-'o V3 Q-LIST IE/NON-SAFETY CONFIRMED

. o. V3 NON-SAFETY REVIEW CONFIDfED -

. o' ' DRAWING DISCREPANCY REVIEW CONFIRMED E

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