Document: NUREG-0800
Document ID: 67e3fd64-e6a4-4522-b90f-4184c2f5b357
Document Type: srp
Title: FUNCTIONAL DESIGN OF CONTROL ROD DRIVE SYSTEM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0705/ML070540139.pdf
Revision Date: 2023-06
Chapter: 4
Section ID: 4.6
CFR Part: 
CFR Title: 

Content:
l systems should assure that a single malfunction of the CRDS will not result in exceeding acceptable fuel design limits. 4. To meet the requirements of GDC 26, the CRDS should be capable of providing sufficient operational control and reliability during reactivity changes during normal operation and anticipated operational occurrences. 4.6-6 Revision 2 - March 2007 5. To meet the requirements of GDC 27, the combined capability of CRDS and emergency core cooling system should reliably control the reactivity changes to assure the capability to cool the core under accident conditions. 6. To meet the requirements of GDC 28, the CRDS should be designed to assure that reactivity accidents do not result in damage to the reactor coolant pressure boundary, or result in sufficient damage to the core or support structures so as to significantly impair coolability. 7. The CRDS should be designed to ensure an extremely high probability of functioning during anticipated operational occurrences to in conformance is GDC, 29. 8. To meet the requirements of 10 CFR 50.62(c)(3), BWR plants should have an alternate rod injection system that is diverse and independent from the reactor trip system and should have redundant scram air header exhaust valves. Technical Rationale The technical rationale for application of these acceptance criteria to the areas of review addressed by this SRP section is discussed in the following paragraphs: 1. GDC 4 requires that SSCs be designed to accommodate the effects of, and to be compatible with, the environmental conditions associated with normal operation, maintenance, testing, and postulated accidents, and be appropriately protected against dynamic effects, including the effects of missiles, pipe whipping, and discharging fluids, that may result from equipment failures and from external events. The CRDS provides the capability to safely shut down the reactor during normal operations and anticipated operational occurrences and either prevents or