ML071780395
| ML071780395 | |
| Person / Time | |
|---|---|
| Site: | Harris  |
| Issue date: | 05/30/2007 |
| From: | Miskiewicz D Nuclear Generation Group, Progress Energy Co |
| To: | Office of Nuclear Reactor Regulation |
| Oudinot D, NRR/DRA, 415-3731 | |
| References | |
| Download: ML071780395 (5) | |
Text
Harris Nuclear Plant (HNP)
Fire PRA Demonstrations NFPA 805 Transition David Miskiewicz May 31, 2007 HNP Pilot Meeting May 30 - June 1, 2007 Raleigh, NC
2 Data Infrastructure
3 O Compartment Scenarios Z All unprotected targets assumed impacted Z Compartment Ignition Frequency w/o severity factor Z Draft fault tree Z No credit for manual supression Z No recovery credit Z FRANC beta software FRANC
4 Timelines and Damage Sets Timelines operations timeline rt or gr fire systems timeline al auto man plant repsonse sp glst un fire growth f
race bar hgl multi damage sets D0 D1 D2 D3 D4 f
al race raceway targets ignite sp auto rt man or bar glst hgl gr multi hgl spreads to adjacent area un the order of the events on each timeline are generally fixed however, the timing can move based on other factors such that the relative order of the events between timelines can vary.
add multi-compartment source fire alarm spurious actuation occurs (and other failures) add protected raceways add local unprotected raceways add balance of raceways in compartment fire begins (source impacts - failures/sp) goal recovery unrecoverable condition is reached (fuel cladding damage) operator responses fire barrier failure goal parameter(s) out of acceptable range (lost) damaging hot gas layer established fire brigade begins suppression actions automatic suppression actuates operator trips reactor
5 Hot Gas Layers / Damage Sets O Determine critical HRR for HGL generation O Evaluating sources using progressive complexity Z 1. Using the source-target database determine the scenario HRR from the 98th ZOI:
source + target trays + adjacent cabinets Z 2. Build simplified fire growth models based on guidance in NUREG/CR-6850 (Template)
Z 3. Expand fire modeling detail as warranted