Document: NUREG-0800
Document ID: a9242e96-646c-405b-bcbe-0f249e45b75c
Document Type: srp
Title: Appendix 7-A
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0525/ML052500544.pdf
Revision Date: 2023-06
Chapter: 7
Section ID: 7
CFR Part: 
CFR Title: 

Content:
ualification requirements (such as those that pertain to environmental conditions, EMI/RFI, and seismic events) are addressed in Section 7.1. IEEE Std 384 defines a maximum credible voltage or current transient as that voltage or current transient that may 1 exist in circuits, as determined by test or analysis, taking into consideration the circuit location, routing, and interconnections combined with failures that the circuits may credibly experience. Appendix 7-A Rev. 4 — June 1997 BTP HICB-11-3 The following types of isolation devices are examples of devices that have been found to be acceptable, provided that the guidelines of this BTP are satisfied: • Isolation amplifiers. • Isolation transformers. • Fiber optic couplers. • Fiber optic cable. • Photo-optical couplers. • Relays (coil to contact isolation). Qualification of isolation devices should be based upon a combination of design analysis and qualification testing. The analysis should demonstrate the adequacy of the design, considering the range of possible fault conditions and variability between individual units. The qualification testing should validate the results of the analysis at the extremes of fault conditions. 2. Information to be Reviewed The information to be reviewed includes the applicant/licensee's description of the (1) device application, (2) device design, (3) test method, and (4) test results. 3. Acceptance Criteria General acceptance guidelines for application and qualification are provided in ANSI/IEEE Std 279 and Reg. Guides 1.75 and 1.153. Acceptance criteria for the descriptions of the device application, device design, test methods, and test results are as follows: Description of Device Application Isolation devices should be classified as part of the safety system and powered in accordance with the guidelines of Reg. Guides 1.75 and 1.153. If non-safety power sources interface to the isolation device, the applicant/licensee should verify that the non-safety power is