Visual inspections of N Reactor horizontal control rod channels
This document describes the examination of thirteen horizontal control rod channels during the N Reactor Surveillance Program campaigns of 1987 and 1988. Traverses with miniature video cameras recorded the condition and relative positions of graphite blocks that form channel walls. The major conclusion confirms that no conditions exist that would prevent rod insertion. Where encroachment of broken filler block keys into the channel indicated a potential for rod motion impairment their removal by displacement into gaps between blocks was performed as preventive maintenance. In some locations a chisel was used in clearing keys lodged in gaps between tube blocks. Other observations include counts of safety balls observed in channels, breaks in tube blocks and Tee-bars and separations at Tee-bar junctions that results from axial graphite contraction. 15 refs., 18 figs., 6 tabs.
- Research Organization:
- Westinghouse Hanford Co., Richland, WA (United States)
- DOE Contract Number:
- AC06-87RL10930
- OSTI ID:
- 720742
- Report Number(s):
- WHC-SP-0600; ON: TI90021240
- Resource Relation:
- Other Information: PBD: Jul 1990
- Country of Publication:
- United States
- Language:
- English
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