ML19220A036

RAI - Edwin I. Hatch Nuclear Plant, LAR Regarding Adoption of NFPA 805, Request for Additional Information, EPID L-2018-LLA-0107

ML19220A036
Person / Time
Site:	Hatch
Issue date:	08/08/2019
From:	John Lamb Plant Licensing Branch II
To:	Enfinger T Southern Nuclear Operating Co
References
L-2018-LLA-0107
Download: ML19220A036 (7)

Text

CODE OF FEDERAL REGULATIONS,

"[f]ire risk is already bounded by the fire initiating event treatment (e.g., loss of the panel is bounded by assumed plant trip.

this modeling assumption was implemented due to conservatism in the modeling logic for LOC and transferring to the RSP."

If the modification is associated with a VFDR, the delta risk calculation eliminates the variance via modification."

If the modification does not mitigate a specific VFDR the modification is credited in both the compliant and variant models to estimate the delta risk between the post transition plant and the compliant model."