# Changes, Tests, and Experiments: Confirmation of Effective Date and Availability of Guidance
> **Nuclear Regulatory Commission** · Final Rule: Confirmation of effective date and availability of guidance. · Published 2000-12-13 · Effective 1999-10-09 · 65 FR 77773
## Document
- **Document number:** 00-31735
- **Category:** nuclear-licensing
- **Sub-agency:** Nuclear Regulatory Commission
- **Federal Register citation:** 65 FR 77773
- **CFR reference:** 10 CFR 50
- **Publication date:** 2000-12-13
- **Effective date:** 1999-10-09
## Abstract

The Nuclear Regulatory Commission amended its regulation concerning changes, tests, and experiments for nuclear reactors on October 4, 1999 (64 FR 53582). The effective date of this amendment was deferred until guidance on implementation of the revised provisions of the rule was issued to reactor licensees. This document announces the availability of that guidance (Regulatory Guide 1.187, "Guidance for Implementation of 10 CFR 50.59, Changes, Tests, and Experiments") and specifies the effective date for the October 4, 1999, amendment to Sec. 50.59.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2000/12/13/00-31735/changes-tests-and-experiments-confirmation-of-effective-date-and-availability-of-guidance)
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