Document: NUREG-0800
Document ID: 4f097781-0d4c-4b5b-be06-a3cd19ae9fe8
Document Type: srp
Title: Revision 5 - March 2007
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0706/ML070660430.pdf
Revision Date: 2023-06
Chapter: 7
Section ID: 7
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guaranteed maximum and minimum. Appendix 7-B-6 Revision 5 - March 2007 Differential Modes - Faults between the signal terminals that cause the potential of one side of the signal transmission path to be charges relative to the other side. Direct indication - Indication from direct measurement of desired variable. Diverse instrumentation and control systems (diverse I&C). Those systems provided expressly for diverse backup of the reactor trip system and engineered safety features actuation systems. Diverse I&C systems account for the possibility of common-mode failures in the protection systems. Diverse I&C systems include the anticipated transient without scram (ATWS) mitigation system as required by 10 CFR 50.62. For plants with digital computer-based instrumentation and controls, diverse I&C systems may also include hardwired manual controls, diverse displays, and any other systems specifically installed to meet the guidance of the staff Requirements Memorandum on SECY-93-087, “Policy, Technical, and Licensing Issues Pertaining to Evolutionary and Advanced Light-Water Reactor (ALWR) Designs.” Documentation - Information recorded about a specific life cycle activity. Forty-one activities are recognized in SRP BTP 7-14. Documentation includes software life cycle design outputs and software life cycle process documentation. A document may be in written or electronic format, and may contain text, illustrations, tables, computer files, program listings, binary images, and other forms of expression. A document for an activity may be divided into several individual entities. Embedded software or firmware - Software that is built into (stored in read-only memory) a computer dedicated to a pre-defined task. Normally, embedded software cannot be modified by the computer that contains it, nor will power failure erase it; some computers may contain embedded software stored in electrically erasable programmable read-only memory (EEPROM), but changing this memory typically