N.J. Admin. Code § 7:31-2.2

Current through Register Vol. 56, No. 24, December 18, 2024

Section 7:31-2.2 - Reactive hazard substance (RHS) hazard assessment

(a) The owner or operator of a covered process in which an RHS or RHS mixture is used, handled, stored or generated shall perform and document a hazard assessment for the RHS in accordance with 40 CFR 68 Subpart B as incorporated by reference with changes at N.J.A.C. 7:31-2.1(c)1 and 2 and this section. As part of this hazard assessment:

1. The owner or operator shall consider the explosive/flammability hazard of the RHS.

2. For stationary sources that have multiple RHSs or RHS mixtures in covered process(es), the owner or operator shall report in the RMP the one worst-case release scenario that is estimated to create the greatest distance in any direction to the endpoint. The owner or operator shall report in the RMP additional worst-case release scenarios if a worst-case release from another covered process at the stationary source potentially affects public receptors different from those potentially affected by the worst-case scenario with the greatest endpoint distance.

3. The owner or operator shall identify, analyze, and report at least one alternative release scenario to represent all RHSs or RHS mixtures held in covered processes.

4. The owner or operator shall report in the RMP the RHS hazard assessment results in the RMP Offsite Consequence Analysis sections for flammable substances.

(b) The owner or operator shall use the following parameters and methods for the RHS hazard assessment:

1. Endpoint parameters: the endpoints for flammables listed at 40 CFR 68.22(a)(2);

2. Worst case release quantity: the maximum capacity of the largest process vessel containing an RHS or RHS mixture, not taking into account administrative controls that limit the maximum quantity;

3. A TNT-equivalent explosion method or any commercially or publicly available explosion modeling techniques, provided the techniques account for the 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 implementing agency access to the model and describes model features and differences from publicly available models upon request. When using a TNT-equivalent explosion method, the owner or operator shall use the following parameters:

i. The heat of reaction of the RHS or RHS mixture;

ii. One hundred percent of the potential heat release (heat of reaction) assumed to contribute to the explosion for an RHS mixture in a process vessel;

iii. One hundred percent of the potential heat release (heat of reaction) assumed to contribute to the explosion for a N.J.A.C. 7:31-6.3 Table I, Part D Group I RHS in a storage vessel but 28 percent of the heat of combustion may be used as an approximation if the detailed heat of reaction data is not available; and

4. All other parameters and calculation methods specified at 40 CFR 68 Subpart B as incorporated with changes at N.J.A.C. 7:31-2.1(c)1 and 2.

(c) An owner or operator having an RHS mixture containing one or more toxic or flammable EHS(s) listed in N.J.A.C. 7:31-6.3(a) Table I, Parts A, B, or C in a process above the threshold quantity who registered only the toxic or flammable EHS pursuant to N.J.A.C. 7:31-7.2(a)3 iv shall be exempt from the requirement of this section to perform an additional hazard assessment for the RHS mixture.

N.J. Admin. Code § 7:31-2.2

New Rule, R.2003 d.335, effective 8/4/2003.
See: 35 N.J.R. 935(a), 35 N.J.R. 3618(b).
Amended by R.2009 d.85, effective 3/16/2009.
See: 40 N.J.R. 5109(a), 41 N.J.R. 1206(b).
In (b)3iii, substituted "One hundred" for "Twenty-eight", and inserted "but 28 percent of the heat of combustion may be used as an approximation if the detailed heat of reaction data is not available".