ML20249B273: Difference between revisions

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#REDIRECT [[3F0698-29, Informs That Util Determined That Addl Testing to Support Original Ampacity Derating Factor Test Data for Fire Barrier Sys Is Not Warranted at Present Time]]
| number = ML20249B273
| issue date = 06/18/1998
| title = Informs That Util Determined That Addl Testing to Support Original Ampacity Derating Factor Test Data for Fire Barrier Sys Is Not Warranted at Present Time
| author name = Baumstark J
| author affiliation = FLORIDA POWER CORP.
| addressee name =
| addressee affiliation = NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
| docket = 05000302
| license number =
| contact person =
| document report number = 3F0698-29, 3F698-29, TAC-M91772, NUDOCS 9806220256
| document type = CORRESPONDENCE-LETTERS, INCOMING CORRESPONDENCE
| page count = 2
}}
 
=Text=
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                                                                                                                                                          '1 Florida e EaffaX","  Power 8lll"Ju"~*.**. mn June 18,1998                                                                                                                                    ,
3F0698-29 U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555-0001
 
==Subject:==
Continued Use of the Safety Evaluation Ampacity Derating Value for the MTS-1 Four Inch Conduit Fire Barrier System at Crystal River Unit 3 (TAC No. M91772)
 
==References:==
: 1. NRC to FPC letter, 3N0597-21, dated May 22,1997, " Crystal River Unit 3
                                  " Request for Additional Information Regarding Thermo-Lag Related Ampacity Derating Issues (TAC No. M91772)"
  -                        2. FPC to NRC letter, 3F0797-06, dated July 3,1997, " Response to Request for Additional Information Regarding Thermo-Lag Related Ampacity Derating Issues"
: 3. NRC to FPC letter 3N1197-13, dated November 14,1997, " Safety Evaluation Addressing Thermo-Lag Related Ampacity Derating Issues for Crystal River (TAC No. M91772)"
 
==Dear Sir:==
 
In Reference 1, the NRC transmitted a Request for Additional Information regarding Florida Power Corporation's (FPC) fire barrier system ampacity derating test results. Item I requested FPC to further justify the Ampacity Derating Factor (ADF) for 4-inch conduit protected by the MTS-1 fire barrier system. Using the FPC test data, Sandia National Laboratories (SNL) conservatively calculated an ADF for this fire barrier of 33% which was above the tested result of 23%. FPC responded in Reference 2 and agreed to use this conservative ADF value for the MTS-14-inch conduit fire barrier system until an alternative resolution was proposed. The NRC issued the Safety Evaluation for FPC's ampacity test report in Reference 3, and acknowledged FPC's agreement to use an ADF of 33% for the 4-inch conduit MTS-1 fire barrier system, f3 FPC has determined that additional testing to support the original ADF test data for this fire I          barrier system is not warranted at this time.              Therefore, FPC 'will continue to use the l          SNL-derived ADF of 33% for the MTS-14-inch conduit fire barrier system until such time that fy l          addition,al analysis or testing is conducted, reviewed, and approved by the NRC.
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* Crystal Rtvor. Florida 34428 4 708 . (352) 795 4 486 PUR  ADOCK 05000302                          A Floride Progress Corrpeny P                    PDR      j;                                                                                _ _ _ _ _ _ ._______ ___
 
U.S. Nuclear Regulatory Commission 3F0698-29                                          .
Page 2 of 2 If you have any questions regarding this submittal, please contact Ms. Sherry Bernhoft, Manager, Nuclear Licensing at (352) 563-4566.
Sincerely, L S. aumstark Director, Nuclear Engineering and Projects
                        . JSB/jnb xc:                  Regional Administrator, Region II Senior Resident inspector NRR Project Manager.
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