Document: NUREG-0800
Document ID: 2349ea77-1f6e-45e4-a2df-f56249a774f1
Document Type: srp
Title: CONTROL ROD DRIVE SYSTEMS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070364.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.9.4
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CFR Title: 

Content:
actions in response to detected leakage to adequately address prevention and mitigation of the effects of leakage associated with potential failures of this piping.51 For BWR control rod drive systems that include a control rod drive return line, the reviewer verifies acceptable commitments for the return line design and its implementation in accordance with Reference 12 and Part II, Section 8 of Reference 11.52 Exceptions taken by the applicant to any of the accepted codes, standards, or NRC criteria must be identified and the basis clearly justified so that evaluation is possible. Engineering judgment, experience, comparisons with earlier cases and design margins, and consultation with supervisors permit the reviewer to reach a decision on the acceptability of any exceptions posed by the applicant.53 The choice of structural materials of construction for the CRDS is reviewed by the MTEBEMCB in SRP Section 4.5.1. 54 3. Loading combinations are defined as those loadings associated with plant operations which are expected to occur one or more times during the lifetime of the plant and include but are not limited to loss of power to all recirculation pumps, tripping of the turbine generator set, isolation of the main condenser, and loss of all offsite power, combined with loadings caused by natural or accident events including, for BWRs, water hammer loads. The load combinations which are postulated to occur are specified for each of the design and service conditions as defined in Paragraph NB-3113 of the ASME Code (Ref. 7) . These load combinations are defined in Reference 12SRP Section 55