ML121710439

Afpb, Request for Additional Information Round 3, Request to Adopt National Fire Protection Association Standard NFPA 805, Performance-Based Standard for Fire Protection for LWR Generating Plants (2001 Edition)

ML121710439
Person / Time
Site:	Callaway
Issue date:	06/19/2012
From:	Andrew Hon Plant Licensing Branch IV
To:	Elwood T Union Electric Co
Hon, A L, NRR/DPR, 415-8480
Shared Package
ML121710420	List: ML121710432 ML121710439 ML121710444
References
TAC ME7046
Download: ML121710439 (1)

Text

REQUEST FOR ADDITIONAL INFORMATION LICENSE AMENDMENT REQUEST TO ADOPT NATIONAL FIRE PROTECTION ASSOCIATION STANDARD 805 PERFORMANCE-BASED STANDARD FOR FIRE PROTECTION FOR LIGHT WATER REACTOR GENERATING PLANTS CALLAWAY PLANT (TAC NO. ME7046)

Office of Nuclear Reactor Regulation Division of Risk Assessment Fire Protection Branch Fire Modeling RAI 1b For the case of fires which postulate propagation to secondary combustibles and a Froude number above the validation range, the licensee indicates the fire conditions are calculated assuming a nominal base area which is smaller than the area of the ignition source. Provide examples where this assumption was made.

Fire Modeling RAI 1c Indicate exactly where in NUREG 1824 it is stated that the total heat release rate was used in the validation of Alperts ceiling jet correlation.

Fire Modeling RAI 1f Provide the results of the sensitivity study related to equivalence ratio on the portal or, if those results are already posted, indicate where they can be found.

Fire Modeling RAI 1g Provide a list of areas and scenarios where the results of the analyses described in Appendix B, C and D of document EPM R1984-01-002 were used.

Fire Modeling RAI 1i Provide the fuel composition that was used in the FDS analyses of areas C-21 and C-22 and explain how this composition was determined.

Fire Modeling RAI 2b The results appear to be counter-intuitive and it may be necessary to determine up to what extent the revised geometry in the FDS input file is representative of that in the plant. Provide the FDS input files and pictures that show the obstructions in areas C-21 and C-22.

Fire Modeling RAI 3k A typical range for standard response sprinkler response time index (RTIs) is 100-350 (m-s)1/2.

Perform a sensitivity analysis to substantiate the use of an RTI of 130 (m-s) 1/2.

Fire Modeling RAI 3t The Society of Fire Protection Engineers (SFPE) Handbook lists two sets of values for the type of qualified cable that is present in the MCR (XLPE/XLPE according to the MCR abandonment study report). XLPE/XLPE cable #1 in the SFPE handbook table has a soot yield of 0.12 g/g and a heat of combustion of 28.3 kJ/g. The values for cable #2 are 0.12 g/g and 12.5 kJ/g, respectively. Explain why the soot yield and heat of combustion for cable #1 were used in the analysis.