ML121710444

Apla, 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)

ML121710444
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: ML121710444 (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 PRA Licensing Branch PRA RAI 23.

In the response to PRA RAI 23, the following needs additional clarification. The last bullet in the list of the basis for assuming a peak transient HRR of 69 kW cites the test results from Table G-7 of NUREG/CR-6850, stating that... the types of fires that can be expected in these rooms (i.e., polyethylene trash can or bucket containing rags and paper) were measured at peak HRRs of 34 kW or below. This is true except for one test, SNL-Nowlen, Test #9, where a 50 kW HRR during the first 15 min was observed. Since this test involved a much larger trash can (30 gal) than any of the others (maximum of 5 gal), the bullet should add either of the following clarifications: (1) i.e., a maximum-sized polyethylene trash can or bucket of ~5 gal. containing rags or paper; or (2) were measured at peak HRRs of 50 kW or less. Provide the appropriate clarification.