Ohio Admin. Code 3745-104-11 - Hazard assessment: alternative release scenario analysis
[Comment: For dates of non-regulatory government publications, publications of recognized organizations and associations, federal rules, and federal statutory provisions referenced in this rule, see paragraph (C) of rule 3745-104-01 of the Administrative Code titled "Referenced materials."]
(A) Number of scenarios. The owner or
operator of a stationary source with processes subject to program two or
program three shall identify and analyze at least one alternative release
scenario for each regulated toxic substance held in a covered process and
shall identify and analyze at least one
alternative release scenario to represent all flammable substances held in
covered processes.
(B) Scenarios to
consider.
(1) For each scenario required under
paragraph (A) of this rule, the owner or operator shall select a scenario
which includes the following :
(a) That is more likely to occur than the
worst-case release scenario under rule
3745-104-10
of the Administrative Code; and
.
(b) That
will reach an endpoint offsite, unless no such scenario exists.
(2) Release scenarios considered
may include, but are not limited to, the following, where applicable:
(a) Transfer hose releases due to splits or
sudden hose uncoupling;
.
(b)
Process piping releases from failures at flanges, joints, welds, valves and
valve seals, and drains or bleeds;
.
(c)
Process vessel or pump releases due to cracks, seal failure, or drain, bleed,
or plug failure;
.
(d)
Vessel overfilling and spill, or overpressurization and venting through relief
valves or rupture disks; and
.
(e)
Shipping container mishandling and breakage or puncturing leading to a
spill.
(C)
Parameters to be applied. The owner or operator shall use the appropriate
parameters defined in rule
3745-104-09
of the Administrative Code to determine distance to the endpoints. The owner or
operator may use either the methodology provided in the "RMP Offsite
Consequence Analysis Guidance" or any commercially or publicly available air
dispersion modeling techniques, provided the techniques account for the
specified modeling conditions and are recognized by industry as applicable as
part of current practices. Proprietary models that account for the modeling
conditions may be used provided the owner or operator allows the director or
the director's representative access to the model and describes model features
and differences from publicly available models to local emergency planners upon
request.
(D) Consideration of
mitigation. Active and passive mitigation systems may be considered provided
they can withstand the event that triggered the release and would still be
functional.
(E) Factors in
selecting scenarios. The owner or operator shall consider the following in
selecting alternative release scenarios:
Notes
Promulgated Under: 119.03
Statutory Authority: 3753.02
Rule Amplifies: 3753.02, 3753.03, 3753.04
Prior Effective Dates: 08/13/1999, 07/01/2005, 01/08/2010
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