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:
rvival rates for those species impinged or entrained by relying on experience at other stations. Certain species have been shown to be especially fragile (e.g., threadfin shad, menhaden, bay anchovy), whereas some shellfish are much hardier (e.g., blue crab and penaeid shrimp). ` Consider the design and proposed operation of any proposed screen wash and fish return system. ` Consider the potential value of such a system, if a return system is not proposed. October 1999 5.3.1.2-7 NUREG-1555 ` Assume 100% mortality for all entrained biota, considering the following: - For once through systems, however, you may perform an analysis using a refined estimate of mortality and factoring in species tolerances to thermal, chemical, mechanical, and pressure stresses; transit time through the system; and plant operational characteristics. - For the special case of a multipurpose cooling pond for which makeup water is provided from another water body, the impacts should be considered at both the plant intake and the source water intake. (5) Consider the potential for altered hydrodynamic characteristics induced by inlet system operation (e.g., altered circulation patterns) to affect attraction and entrapment of aquatic biota, and consult with the reviewer for ESRP 5.3.1.1 to determine the extent and seasonal variation of any such alterations. (6) Consult with the reviewer for ESRP 5.3.2.1 to determine if there is any potential for the recirculation of heated effluent from the plant discharge system. If recirculation is predicted, analyze the potential effects of increased impacts of entrapment, entrainment, and impingement. (7) In this final step, estimate the magnitude of the potential impingement and entrainment impacts on the species populations and the aquatic ecosystem. ` 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