Document: NUREG-1555
Document ID: 5a4eb38b-9f84-4cc6-ab01-0be817580f4c
Document Type: esrp
Title: INTAKE SYSTEM
Source: NUREG-1555
Source URL: https://www.nrc.gov/reading-rm/doc-collections/nuregs/staff/sr1555/initial/
Revision Date: 2007-10
Chapter: 5
Section ID: 5.3.1
CFR Part: 
CFR Title: 

Content:
. ` Use the results of Step 4 as the starting point (i.e., the potential station cropping rates for phytoplankton, zooplankton, and meroplankton, including fish eggs and larvae, and juvenile stages of “important” species). ` Consider these cropping rates in relation to natural mortality rates, reproductive rates, and standing stock estimates for the species populations. ` Consider other existing stresses (cumulative mortality) to the fragile species (e.g., impacts of other electrical generating stations sited nearby). In general, the entrainment cropping of phytoplankton and zooplankton will not impact these communi- ties due to the short reproductive cycles for these species. More detailed consideration should be given those species with annual reproductive cycles, such as most fish and shellfish. The reviewer may assume, for a first approximation, that plant cropping translates directly to a reduction in the harvestable or parent stocks. Where possible, this impact should be expressed in quantitative units such as (1) catch per unit effort, (2) harvestable stock by weight, (3) recruitment in numbers, (4) dollar values, and (5) numbers or percentages of specific size, age group, or life stage. The reviewer may use more refined analyses (e.g., population modeling, compensation factors) when results suggest that additional precision is needed. NUREG-1555 5.3.1.2-8 October 1999 IV. EVALUATION FINDINGS The depth and extent of input to the EIS will be governed by the attributes of the aquatic ecological resources that could be affected by operation of the station’s heat dissipation systems and by the magnitude of the expected impacts on these resources. This section of the EIS should present (1) a list of adverse impacts of cooling system intake operation to aquatic ecosystems, (2) a list of the impacts for which there are measures or controls to limit adverse impacts and the associated measures and controls, (3) the applicant’s commitments to limit these