View source for RBG-42159, Forwards Response to 950925 RAI Re GL 92-08, Thermo-Lag 330-1 Fire Barriers, Including Response to GL 92-08 Reporting Requirement 2(c) from & Calculations Which Will Be Used to Detemine Ampacity Derating Parameters

{{Adams
| number = ML20094K925
| issue date = 11/09/1995
| title = Forwards Response to 950925 RAI Re GL 92-08, Thermo-Lag 330-1 Fire Barriers, Including Response to GL 92-08 Reporting Requirement 2(c) from & Calculations Which Will Be Used to Detemine Ampacity Derating Parameters
| author name = Fisicaro J
| author affiliation = ENTERGY OPERATIONS, INC.
| addressee name = 
| addressee affiliation = NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
| docket = 05000458
| license number = 
| contact person = 
| document report number = GL-92-08, GL-92-8, RBF1-95-0265, RBF1-95-265, RBG-42159, TAC-M85596, NUDOCS 9511170213
| package number = ML20094K929
| document type = CORRESPONDENCE-LETTERS, INCOMING CORRESPONDENCE
| page count = 7
| project = TAC:M85596
| stage = Other
}}

=Text=
{{#Wiki_filter:Entctgy operations. Inc.
Rwer Bend Stahon 54E5 U S Hghaay 61 5~ ENTERGY                                                                        ; " Fie tx 7077s.
Tel 504 336 0225 Far 504 635 5068 James J. Fisicaro Duector Nuclear Saf tey November 9,1995 U.S. Nuclear Regulatory Commission Document Control Desk Mail Stop Pl-37 Washington, D.C. 20555

==Subject:==
Response to Request for Additional Infonnation, Generic Letter 92-08, "Thermo-Lag 330-1 Fire Barriers" (TAC No. M85596)
River Bend Station - Unit 1 License No. NPF-47 Docket No. 50-458 File Nos.:     G9.5, G9.33.4 RBG-42159 RBF1-95-0265                                                                                           ,
i Gentlemen:
The Request for Additional Information (RAI), Generic Ixtter 92-08, "Thermo-Lag 330-1 Fire Barriers" (TAC No. M85596) dated September 25,1995, requested that Entergy Operations, Inc., (EOI) submit ampacity derating evaluations, including any applicable test repons, in order to provide an adequate response to GL 92-08 reponing requirement 2(c).
The summary of the requested infonnation incorrectly indicated that no ampacity information was previously provided by River Bend Station (RBS). The RBS response to GL 92-08                      l reponing requirement 2(c) was provided in a {{letter dated|date=April 14, 1993|text=letter dated April 14,1993}} (RBG-38343). An RAI dated Decen.ber 22,1993, acknowledged the April 14,1993, response. The RBS response to the December 22,1993, RAI was dated February 9,1994 (RBG-40047), and addressed ampacity issues in Section IV.B., "Ampacity Demting." This response was acknowledged in the Follow-up to the RAI dated September 23,1994. Attachment I provides                ;
EOI's n:sponse to GL 92-08 reponing requirement 2(c) from the {{letter dated|date=April 14, 1993|text=letter dated April 14, 1993}}.
In addition, EOI was requested to submit the anticipated test procedures or a description of the analytical methodology including typical calculations which will be used to detennine the ampacity derating pammeters, or to infonn your office of the earliest date by which this informatiog will be pmvided for the Thermo-Lag fire barriers installed at RBS. EOI's
               .~utLt5 9511170213 951109 PDR     ADOCK 05000458                                    0 %
P.                     PDR                                    \

Response to Request for Additional Information, Generic I.etter 92-08, "Thermo-12g 330-1 Fire Barriers" (TAC No. M85596)                                                                 ;
l    November 9,1995
!    RBG-42159                                                                                       i RBF1-95-0265 Page 2 of 2                                                                                     ;
II response is pmvided in Attachment 2. Note that a supplement to this response will be           !
provided in accordance with the schedule described in the attachment.                           !
!     Should you have any questions or mquim additional information, please contact Tim Gates of     j my staff at (504) 381-4866.                                                                    ,
t Sincerely, f
               &                    h f
    . JJF/kym i
l     attachments (2) l     enclosure (1)                                                                                   l l
l     cc:    U.S. Nuclear Regulatory Commission l            Region IV l            611 Ryan Plaza Drive, Suite 400 l            Arlington, TX 76011 Mr. D. L. Wigginton U.S. Nuclear Regulatory Commission 11555 Rockville Pike M/S OWFN 13-H-3 Rockville, MD 20852 l
l NRC Resident Inspector (w/o enclosure)
P.O. Box 1051                                                                           j l             St. Francisville, LA 70775                                                              i l
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4 9
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  . . . -..~.m_ -. . . . _ _ _ _ . - . . . - . _ -
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BEFORE THE l'                                                 UNITED STATES NUCLEAR REGULATORY COMMISSION                                                          j i                                                                                                                                                       :
1                                                                                                                                                       !
l LICENSE NO. NPF-47                                                                   :
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DOCKET NO. 50-458                                                                  ;
I '-                                                                 IN THE MA*lTER OF                                                                  l 4
GULF STATES UTILITIES COMPANY                                                                l l
CAJUN ELECTRIC POWER COOPERATIVE AND                                                              I ENTERGY OPERATIONS, NC.                                                                   {
l AFFIRMATION                                                                     j I, George A. Zinke, state that I am acting Director of Nucicar Safety of Entergy Operations, Inc., at River Bend                      ;
Station; that on behalf of Entergy Operations, Inc., I am authorized by Entergy Operations, Inc. to sign and file                      1 with the Nuclear Regulatory Commission, this Response to Request for Additional Information, Generic Letter 92-                        l 08,"Thermo-La 130-1 Fire Barriers" (TAC No. M855%), that I signed this supplement as acting Director-                                 i Nucien Safety a. ',iver Bend Station of Entergy Operations, Inc.; and that the statements made and the matters set                     !
forth therein are true and correct to the best of my knowledge, information, and belief.
                                                                                            ,       ?
O George AZihke STATE OF LOUISIANA                                                                                                                     ,
WEST FELICIANA PARISH I
SUBSCRIBED AND SWORN TO before me, Notary Public, commissioned in the Parish of East Baton Rouge and qualified in and for the Parish and State above named, this           9 4 day of Il6m4a b .1995, bbu            46 ((
U Jane Russell Notary Public My Commission expires with life.
l           ,    . -               . . , . ,                            - . . , , . , -               . . -_,       .       -

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ATTACHMENT 1 i
Reauest for Additional Information (RAI) of February 9.1994 The Request for Additional Information (RAI), Generic Letter 92-08,"Thermo-Lag 330-1 Fire Barriers" (TAC No. M85596) dated September 25,1995, requested, in part, that Entergy Operations, Inc., (EOI) submit ampacity derating evaluations, including any applicable test reports, in order to provide an adequate response to GL 92-08 reporting requirement 2(c). GL 92-08 reporting requirement 2(c) states:
State (1) whether or not the as-built Thermo-Lag 330-1 barrier configurations are consistent with the barrier configurations used during the ampacity derating tests relied upon by the licensee for the ampacity derating factors used for all raceways protected by Thermo-Lag 330-1 (for fire protection or safe shutdown capability or i
to achieve physical independence electrical systems) and (2) whether or not the ampacity derating test results relied upon by the licensee are correct and applicable to the plant design.                                                                                   j l
l The RBS response to GL 92-08 dated April 14,1993, (RBG-38343) states, in part-The as-built fire barrier configurations at RBS are consistent with fire barrier configurations used in TSI ampacity derating tests. The fire barrier configurations used in the tests were installed in accordance with TSI Technical Note 20684, "Thermo-Lag 330 Fire Barrier System, Installation Procedures Manual." In general, fire baniers at RBS were installed to the same procedure, therefore, for the purposes of ampacity derating, the as-built fire barrier configurations are consistent with those used in the qualifying tests.
The ampacity derating of cables inside Thermo-Lag wrapped raceway is addressed in RBS Calculation E-218, "Ampacity Verification of Cables Within Raceways Wrapped with Appendix R Fire Protection Banier." The basis for the ampacity derating was a letter from TSI to SWEC dated July 5,1985. The test report numbers and ampacity derating values are shown in the following table:
TSI            UL DERATING         DERATING TEST REPORT                          DESCRIPTION                 VALUE            VALUE 1.T.L. No. 82-355-F-1            One llour Cable Tray Test                  12.5 %
I.T.L. No. 84-3-275A             Three llour Cable Tray Test              20.55 %
Technical Note No. 111781        One llour Conduit Test                      7.2%
I.T.L. No. 84-10-5               Three llour Conduit Test                  9.72 %                     i UL 86NK23826, File R6802         One 1Iour Cable Tray Test                                  28.0 %
UL 86NK23826, File R6802         1hree llour Cable Tray Test                                31.2 %
UL 86NK23826, File R6802         1hree 11our Conduit Test                                    9.4%
A letter from Underwriter's Laboratories (UL) to TSI dated January 21,1987, presides the results of a test performed by UL to determine the ampacity derating of Thermo-Lag 330 fire

Attachmsnt 1 RBG-42159 RBF1-95-0265 Page 2 of 2 wrap enclosures. The RBS review of the UL Report concerning ampacity derating of Thermo-Lag 330 fire wrap enclosures noted that the UL test configurations vary from the TSI report and the RBS installed configurations. Calculation E-218 was reviewed using the more conservative ampacity derating factors from the UL test shown in the table above. The review and resulting modifications confirmed that all wrapped cables are adequately sized.
Although GL 92-08 reporting requirement 2(c) contains no specific request to submit ampacity derating evaluations, a copy of Calculation E-218 is enclosed.

                                       - A'ITACHMENT 2 Request For Additional Information of December 28.1994 The RAI dated September 25,1995, requested, in pan, that EOI submit the anticipated test procedums or a description of the analytical methodology including typical calculations which will be used to detennine the ampacity derating parameters, or to inform your office of the earliest date by which this information will be provided for the Thermo-Lag fire baniers installed at RBS. As explained in previous RAI responses (most recently, RBG-42029 dated October 26,1995) RBS is pursuing a comprehensive program to evaluate applications of Thenno-Lag in the plant. The project consists of two sections. The first is a re-analysis of the Safe Shutdown Methodology. This effon is expected to result in a significant reduction in the amount of fire wrap material required. The second will review the Thermo-Lag installations that remain and determine if the Thenno-Lag can be qualified as-is through additional testing, if the Thenno-Lag can be upgraded economically using methods similar to those tested by the Nuclear Energy Institute, or if the Thermo-Lag must be replaced with a diffemnt material.
The Project Instmetion for evaluating ampacity is currently under development. Based upon the current project schedule, ampacity testing and/or model development will occur during the second quaner of 1996. A supplement to this msponse will be provided at that time with the anticipated test procedures or a description of the analytical methodology including typical calculations which will be used to detennine the ampacity derating parameters. A summary of the process which is expected to be used is provided below.
: 1. Identify all required and abandoned Thermo-Lag wrapped raceways and the associated       l cables.                                                                                  I 1
: 2.      Son cables by function-l 120 VAC or 125 VDC Control and Power Cables Small Power Cables Large Power Cables (480V) i Instrumentation Cables                                                          '
4 kV Power Cables 13.8 kV Power Cables
: 3.      Evaluate instrumentation cables for generic elimination from the analysis.
: 4.      Evaluate 120 VAC and 125 VDC control cables for generic elimination from the analysis.
: 5.      For all power cables, detennine the component it supplies and load current.
For AC loads, use electrical transient analysis program (ETAP)
For DC loads, use calculated values for full load current at rated voltage and  ,
rated hp/kW                                                                   i
: 6.      Develop ampacity adjustment factor (value greater than one).                            1 i

RBG-42159 RBF1-95-0265 Page 2 of 2
: 7. Apply ampacity adjustment factor to determine minimum required ampacity.
Minimum Required Ampacity = FullImad Current X Ampacity Adjustment Factor
: 8. For each cable in a wrapped raceway, identify the cable diameter. Use this value to.
detennine the base ampacity of the cable based upon 40 C in air.
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: 9. Identify the maximum ambient design temperatum for each mom in which a wralped raceway exists. Use this value to determine the'ampacity derating adjustment for temperature.
: 10. Calculate the depth of cables in each wrapped tray (other than contml cables). Use this value to determine an ampacity derating adjustment for cable depth.
I 1. Identify the wrap detail and determine if it is bounded by a Texas Utilities (TU)
Electric Company test case. If yes, then use TU demting factor. If no, then develop additional analysis.
: 12. Calculate the derated cable ampacity with fire wrap using the TU ampacity derating value.
: 13. Knowing the cable ampacity with firewrap and the minimum required ampacity, calculate the margin. If margin is less than zero, perfonn additional analysis.                  ,
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