ML20247E722
| ML20247E722 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 03/24/1989 |
| From: | Moran D Office of Nuclear Reactor Regulation |
| To: | Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20247E728 | List: |
| References | |
| NUDOCS 8904030222 | |
| Download: ML20247E722 (7) | |
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UNITED STATES
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NUCLE AR REGULATORY COMMISSION i
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rdASHINGTON D. C. 20555 March 24, 1929
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.g LICENSEE. Tennessee' Valley Authority TACILITY. Ercwns Ferry huclear Plant, Units 1, 2 and 3 1
SUBJECT:
.BROWh5 FERRY CAFLE SEPARAT*0N ISSUE - MARCH 14, 1989 MEETING SUMMAD On Tuesday, Merch 14, 1989, the *VA Projects Division staff met with TVA at the i
hRC effices ir Reckville, Maryland to hear a presentation on Browns Ferry -
' cable separation issues. The meeting was requested by TVA.
g The meeting announcement is Enclosure 1.
The attendance roster is Enclosure 2 ano the transcript of the proceedings is Enclosure 3.
The staff met witt TVA at their urging.
The meeting was attended by Special Projects senicr ranagement, as requesteo by TVA.
The cable populations and groups discussed are listed below:
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The Groups ere:
Y5 - 4160 solt power cable V - 48C volt power cable 4L - 120 volt ac/250 velt de contrul cable V$-5-10voltinstrumentcableand V{-c111ivoltormilliampereinstrumentcable Cable populatiers for these groups are:
V /Vc safety-related cables - 982 total V safety-related cables
- 5500 total V associateo cables
- approximately 16,500 total V /V safety-related cebles - unknown total 2
Corcerning V /V Cables j y TVA has signel traced 443 of the 9E2 safety-related cables.
TVA has evaluated 228 cables for separation and identified 18 separation discrepancies.
Eight cables require physical separation.
f The is positicr. curing the February 16, 1989 meetir.g was that 13 of the
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18 discrepancies ioentified in their January 6, 1989 report were correctly icentified and represented 93% reliability and 95'4 confidence level. TVA contluded they had established an acceptable level of confidence in their data base and therefore no further review was required.
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r Tre 7'4 position during the March 7, 1989 meeting represented no change from inat of: the February 16, 1989 meeting.
However, TVA agreed to consider the staff positior. on March 7, 1989 which was:
,q TVA has a sarple of 443' cables; i1 Deternine the number of discrepancies allowable for a 95-95 L
conficence level; and Review the remaining discrepancies found in the V /V 88*PI'*
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Du-ing the March 14, 1989 meeting to which the summary pertains, TVA stated their understanding as to the proper course of action if the V /V sampling produced discrepancies outside the acceptable limit.
That is,4TVkwould increase the scmple size to 100% of the population defined for the sample i# the discrepancies from the sample fall outside the acceptable liinit.
Concerning V, Cable Zero V cables were evaluated for separation prior to the February 16, 1989 meeting,.
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TVA has a record of a sample of 155 cables, made for another purpose and focuseo on design significance: -80 ampacity, 75 Appendix R cables including LE3 essociated cables.
TVA-found two failures to meet separation requirements associated with the ampacity in this sample.
Based on the discussion during the March 7,1989 meeting, tne staff proposed the following methodology for V 3
. cable are TVA' agreed to consider the methodology at that time:
Determine the various population divisions which the total number (22,000) of V cables is amendable to; 3
Set a sample size for attainment of a 95-95 confidence level for nach i
populations-Establish acceptance criteria; Perform the sampling; If pass, the inference is, the sample is indicative of the related population; and If failure of any sampling, increase sample size to 100% of the populatico division.
TVA stated concerning the 155 cable sample, a
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EC drawing discrepancies were identified from the.ampacity review;
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'14 orawing discrepancies were identified from the Appendix R. review; arc-L'nknown' separation violations frca the Appendix R data - review not completec.
Cor.cerning V./L Cables' TVA's position during the March.7,1989 meeting was V /V, are very low l
amperage, for example. currents are 10-50 milliamperes, up to 50 volts; and-typit. ally 14 gauge to 18 gauge wire. TVA noted that short circuit currents which can be generated in this category are less than ampacity ratings of these cables, hence. TVA prcpased to do nothing further except for Appendix R cables which are estimated to tctal less than 100 cables. The staff suggested at the March 7, 19E9 meeting, that a worst case analysis be included.in the submittal to justify the basis.
Durirg the March 14, 1989 meeting the staff added the need to address external damage from jet impingement or missiles in the worst case ar.alysis.
TVA has yet to document their approach for the cable separation resolution-discussed in this and the previous meetings, s
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nt David H. Mora(, hject TVA Projects Division Office of Special Projects
Enclosures:
1.
Meeting Announcement 2.
Attendance List 3.
Transcript cc w/ enclosures:
See next page
3-g.c 80 drawing discrepancies were identified from the ampacity review; 14 drawing discrepancies were identified from the Appendix R' review; and Unknown separation violations from the Appendix R data - review not completed.
Concerning V,/V,, Cables u
TVA's position during the March 7,1989 meeting was V /V, are very low I
amperage, for example currents are 10 50 milliamperes, up to 50 volts; and typically 14 gauge to 18 gauge wire. TVA noted that short circuit currents which can be. generated in this category are less than ampacity ratings of these cables, hence, TVA proposed to do nothing further except for-Appendix R cables which are estimated to total less than 100 cables. The staff suggested at the March 7,1989 meeting, that a worst case analysis be included in the submittal to justify th0 basis. During the March 14, 1989 meeting the staff added the need to address external damage from jet impingement or missiles in the worst case analysis.
TVA has yet to document their approach for the cable separation resolution discussed in this and the previous meetings.
f$nalsigned by:
David H. Moran, Project Manager TVA Projects Division Office of Special Projects
Enclosures:
1.
Meeting Announcement 2.
Attendance List 3.
Transcript cc w/ enclosures:
See next page Distribution Docket File NRC PDR-Local PDR Those on Attached List OFC :NRR:TVA/LA :NRR:T /PM
- TVA: AD/P
- TVA:AD/TP :
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- SBl M 3h 89 l DATE :3/9 /89
- 3h 89
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4i Browns Ferry Nuclear Plant-ct:
Ger.eral Counsel Regional Administrator, Region II
~er.nessee Valley Authority U.S; Nuclear Regulatory Commissi m
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--:: West: Sunmit Hill Drive 101 Marietta Street, N.W.
. Atlanta, Georgia 30323-
'E:: B33 37902 Tra ville, Ternessee Resident Inspector / Browns Ferry NP.-
- Mr. R. L.'Gridley.
U.S. NuclearLRegulatory(Commission
-Tennessee Valley Authority Route 12, Box-637 SE 157B Lookout Place Athens, Alabama 35611L Chattanooga, Tennessee 37402-2801
.Mr..C. Mason Dr. Henry Myers.. Science Advisor Tennessee._ Valley Authority Committee on Interior Browns Ferry: Nuclear Plant and Insular Affairs
'P.C.. Box 2000 U.' S. House of Representatives Decatur,-Alabara 35602 Washington, D.C.
20515 Tennessee Valley-Authority' Mr. F. Carier.
Rockville Office
. Tennessee Valley Authority 11921'Rockville Pike Browns Ferry Nuclear Plant Suite 402 P.O. Ecx.2000 Rockville, Maryland 20852 Decatur, Alabama 35600 Mr.. 0 liver D. Kingsley, Jr..
Senior Vice President, Nuclear Power
- Mr..D. L. Williams
. Tennessee Valley Authority:
' Tennessee-Valley Authority.
400. West Summit Hill Drive 6N 58A Lookout Place W10 BE5 110f, Market' Street Knoxville, Tennessee 37902 Chattanooga, Tennessee 37402-2801 Chairman., Limestone County Commission P.O.' Box 188 Athens, Alabama 35611 Claude Earl Fox, M.D.
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State Health Officer I
State Departrent of Public Health-State Office Building Montgomery, Alabama 36130 i
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.. 4 o'M D'5TR:EUTION FC: MEETING
SUMMARY
DATED: March 24, 19T9 Facility:
Browns Ferry Nuclear Plant, Units 1, 2 and 3*
-.e::Dc:kef Fili"?
'2: ?DR
- ccal PD Fr;jects Reacd r; ACSP Readin
D. CrutChfield B. C. Liaw S. Elect E.. PiersCr D.
- h. MOrar.
G. Gears M 51rr.s L. Watson
.. Partlow J. Rutberg E. F. G0ccnir H. Garg A. Marincs R. Pierson F. Paulit:
R. Auluck ACRS (10)
GPA/PA GPA/CA (M. Callahan) (5)
E. Jorder.
B. Grimes
- . Gwynn J. Scarberough G. Marcus J. Gray L. Nc. r no i,..
C. Ader BFN Rag. File cc:
Licensee / Applicant and Service List 1
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-LISTRIBUT Orc FOR MEETING' NOTICE DATED:
March 9,.i929
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u Facility: l Browns Ferry Nuclear. Plant,:Unnit 2*
Cccret File L
NR PCR
'!.ccal PDR
'Erojects-Reacing
-ADSF. Reading-D. Crutenfield B.-D. Liaw S. Black-
'R.'Pierson E'.
Hayes
- 3-E 4 F...McCoy RII
' S. Va rga
, 12-G-19 E. Jordan
-MNBB-3302 B. Grimes 9-A-2 W. S. Little Ri!
M. Simms B. Zalcman
-E.
Goocwin G. Gears-D. H. Moran
- h. Lanning 11-E-22
.Q. Rutberg 15-B-18
'A. Marinos H. Garg
.F. Paulitz.
D. Lurie ACRS (10)-
L GFA/PA 2-G-5 GPA/CA(E)-
J. Scaroorough 16-H-3 G. Marcus 16-H-3 P. Gwynn 16-H-3 C. Ader.
16-H-3 T. Elsasser 16-H-3 L. Norrholm 16-H-3 M..Callahan 16-G-19 BFN Rdg. File
- cc:
Licensee / Applicant & Service List J
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