Nev. Admin. Code § 459.95364 - Parameters for analysis of off-site consequences
1. An
owner or operator shall use the following endpoints when preparing an analysis
of off-site consequences:
(a) For toxic highly
hazardous substances, the toxic endpoints provided pursuant to NAC
459.9533;
(b) For flammable highly hazardous substances
and explosives:
(1) In a scenario that studies
the potential effects of an explosion, an overpressure of 1 psi (0.0703 kilograms per square
centimeter);
(2) In a scenario that
studies radiant heat and exposure time, a radiant heat of 5 kw/m2
(1586 BTU per hour per square foot) for 40 seconds; or
(3) In a scenario that studies the lower
flammability limit, the lower flammability limit provided by the N.F.P.A. or
other generally recognized sources; or
(c) If an endpoint is not provided pursuant
to NAC 459.9533 or a substance is not
designated or classified as toxic, flammable or explosive pursuant to NAC
459.9533, the owner or operator
shall define an appropriate endpoint that results in the greatest impact to
employees and public receptors. The owner or operator shall define a toxic
endpoint in a manner that is comparable to the health impacts defined by the
2020 Emergency Response Guidebook, which is adopted by
reference pursuant to NAC
459.95528, and shall define a
flammable or explosive endpoint as set forth in paragraph (b).
2. The owner or operator shall use
a wind speed of
1.5 meters per second
(4.9 feet per second) and an
atmospheric stability class of F when preparing the worst-case release
analysis, except that, if the owner or operator demonstrates that local
meteorological data show a higher minimum wind speed or less stable atmosphere
at all times during the previous 3 years, these minimums may be used. For an
analysis of an alternative scenario, the owner or operator shall use the
typical meteorological conditions.
3. Except as otherwise provided in this
subsection, the owner or operator shall use the highest daily maximum
temperature during the previous 3 years and the average humidity for the site
based on temperature and humidity data gathered on-site or at a local
meteorological station for a worst-case release analysis involving a toxic
highly hazardous substance. A facility using the R.M.P. Guidance for
Off-Site Consequence Analysis, which is adopted by reference pursuant
to NAC 459.95528, may use 25°C
(77°F) and 50 percent humidity as values for these variables.
For an analysis of an alternative scenario, the owner or operator may use typical temperature and humidity data gathered on-site or at a local meteorological station.
4. The owner or
operator shall analyze:
(a) A worst-case
release of a toxic highly hazardous substance assuming a ground level (0 feet)
release.
(b) An alternative
scenario involving a toxic highly hazardous substance using the release height
that is determined by the release scenario.
5. The owner or operator shall use urban or
rural topography for a worst-case release scenario or an alternative scenario,
as appropriate. An urban topography has many obstacles, such as buildings and
trees, in the immediate area. A rural topography has no buildings in the
immediate area, and the terrain is generally flat and unobstructed.
6. The owner or operator shall ensure that
any table or model used for a dispersion analysis of a toxic highly hazardous
substance appropriately accounts for gas density.
7. For a worst-case release analysis, the
owner or operator shall assume that a liquid other than a gas which is
liquefied by refrigeration only is released at the highest daily maximum
temperature based on data for the previous 3 years appropriate for the
facility, or at process temperature, whichever is higher. For an alternative
scenario, the owner or operator may assume that the substance is released at a
process or ambient temperature which is appropriate for the scenario.
8. As used in this section, "typical
meteorological conditions" means the temperature, wind speed, cloud cover and
atmospheric stability class that prevail at the site based on data gathered at
or near the site or from a local meteorological station.
Notes
NRS 459.3818, 459.3833
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