ML18033A644
| ML18033A644 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 02/21/1989 |
| From: | Gridely R TENNESSEE VALLEY AUTHORITY |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| TAC-62260, NUDOCS 8902280247 | |
| Download: ML18033A644 (9) | |
Text
gc CELE RATED DI BUTI0N DEMONSTRATION SYSTEM REGULATOR NFORMATION DISTRIBUTION TEM (RIDS) o>
ACCESSION NBR:8902280247 DOC.DATE: 89/02/21 NOTARIZED:
NO DOCKET FACIL:50-260- Browns Ferry Nuclear Power Station, Unit 2, Tennessee 05000260 AUTH.NErME AUTHOR AFFXLXATXON GRIDELY,R.
Tennessee Valley Authority RECIP.NAME RECIPIENT AFFILIATION Document Control Branch (Document Control Desk)
SUBJECT:
Discusses 890202 meeting re facility cable ampacity evaluation program, incorporate DOR gu'idelines in EQ program.
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TITLE: TVA Facilities Routine Correspondence NOTES:1 Copy each to: S.Black, J.G.Partlow, B.D.Liaw, F.McCoy D
05000260 RECIPIENT ID CODE/NAME SIMMS,M GEARS,G INTERNAL: ACRS UDGC STRACT REG FILE 01 COPIES LTTR ENCL 1
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TENNESSEE VALLEYAUTHORITY CHATTANOOGA. TENNESSEE 37401 5N 157B Lookout Place PPB 51%88 U.S. Nuclear Regulatory Commission ATTN:
Document Control Desk Washington, D.C.
20555 Gentlemen:
In the Matter of Tennessee Valley Authority Docket No. 50-260 BROWNS FERRY NUCLEAR PLANT (BFN) UNIT 2 ELECTRICAL CABLE AMPACITY (TAC 62260)
The purpose of this letter is to confirm in writing agreements reached with NRC during meetings held at BFN on February 2,
- 1989, and in Rockvi lie, Maryland on February 6, 1989.
During the course of discussions regarding BFN's cable ampacity evaluation prog'ram, TVA noted that one of its major limiting ampacity considerations was that a large number of power cables had been derated during specific environmental qualification (EQ) testing.
The deratings were not the result of observed or anticipated performance limitations but rather resulted from restricted aging durations used to satisfy plant schedule" commitments.
The staff, along with their consultants from Sandia National Laboratories, noted that the evaluations did not appear to take advantage of the full range of options afforded by the Division of Operating Reactors (DOR) guidelines for a plant of BFN's vintage.
The staff and TVA agreed that further EQ considerations could be applied with certain restrictions to establish qualification at the manufacturer's ratings for many crosslinked polyethylene cables in areas of limited environmental transients.
'The enclosure provides a listing of the significant considerati'ons that shall be applied when performing qualification analysis in accordance with the provisions of the DOR guidelines.
In summary, TVA plans to incorporate the DOR guidelines into its EQ program at BFN.
Furthermore, the revised ratings will then serve as a basis for reevaluation of the affected cables ampacity.
8902280247 890221 PDR ADOCK 050002b0 P
PNU An Equal Opportunity Employer
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Nuclear Regulatory Commission
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'. If you have any questions, please telephone Patri,ck P. Carier,'FN Site Licensing, at (205) 729-3570.
Very truly yours, TENNESSEE VALLEY AUTHORITY Enclosures cc (Enclosures):
Mr. F.
R. McCoy, Assistant Director for Inspection Programs TVA Projects Division U.S. Nuclear Regulatory Commission Region II 101 Marietta Street, NH, Suite 2900 Atlanta, Georgia 30323 Ms. S.
C. Black, Assistant Director for Projects TVA Projects Division U.S. Nuclear Regulatory Commission One Nhite Flint, North 11555 Rockvi lie Pike Rockvi lie, Maryland 20852 Browns Ferry Resident Insp'ector Browns Ferry Nuclear Plant Route 12, Box 637
- Athens, Alabama 35609-2000 R. Gridley, anager Nuclear Licensing and Regulatory Affairs
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Enc 1 osure ELECTRICAL CABLE AMPACITY Page 1 of 2 The following considerations shall apply when performing qualification analysis in accordance with the provisions of the DOR guidelines for electrical cables at Browns Ferry (BFN).
Cables will be eligible for consideration under the guidelines in accordance with their date of purchase.
Only cables of domestic manufacture may be evaluated with this approach.
Only cables with crosslinked 'p'Olyethylene (XLPE) primary insulation may be evaluated using this approach't is recognized that similar analysis for other materials might be developed with parameters suited to that material.
A separate submittal would be required for any other insulation systems.
Generic qualification analysis will only be used in the absence of other conclusive test data for the ratings and environments of concern.
As previously noted by TVA, all EQ required cables in BFN's three most environmentally severe areas (drywell, steam tunnel, and reactor water cleanup backwash receiving tank room) are being replaced.
The subject analysis may not be applied in these areas due to their environmental severity.
Except as noted below, generic analysis wi 11 be limited to cables installed in areas of the plant where the postulated accident temperatures do not exceed 205'F.
For areas exceeding 205'F during a postulated
- accident, the subject cables must meet one or more of the following criteria; a.
the cable does not have to operate during the accident that creates the transient in excess of 205'F, or; b.
C.
the cable does not have to operate until the temperature decreases below 205'F, or; the cable is routed in conduit (i.e.,not on open tray) and it can be shown by test that the cable temperature does not exceed 205'F at any time during the transient.
Note:
Similar analysis was used in evaluating the affects of superheat in the main steam valve vault at Sequoyah.
The total radiation dose must not exceed 17 MRads (40 year normal plus accident dose) in the areas under consideration.
Enclosure ELECTRICAL CABLE AMPACITY Page 2 of 2 Although cables are not considered pressure sensitive, for the purposes of this evaluation TVA will only consider installations in areas which do not experience pressures greater than 5 psi above normal.
In keeping with section 4(8) of NUREG-0588 the aging affects of humidity are not considered significant.
Therefore, all areas with a relative humidity of up to and including 100 percent will be evaluated in this analysis.
Based on the above considera'ti'ops and limitations environmental qualification packages will be generated for each manufacturer and cable type (i.e.
no 'generic cable binder'ill be assembled).
The subject analysis will be based upon a review of a wide variety of resources including, but not limited to; a.
TVA, vendor or independent lab reports on XLPE cable, qualification to enveloping conditions.
The intent will be to show the strength of this family of materials from across the industry.
b.
A literature search of available materials data to establish the conservative nature of the limiting conditions selected.
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