Browns Ferry-1 single-loop operation tests

Technical Report · Sun Sep 01 00:00:00 EDT 1985

DOI:https://doi.org/10.2172/5070273· OSTI ID:5070273

March-Leuba, J.; Wood, R. T.; Otaduy, P. J.; McNew, C. O.

This report documents the results of the stability tests performed on February 9, 1985, at the Browns Ferry Nuclear Power Plant Unit 1 under single-loop operating conditions. The observed increase in neutron noise during single-loop operation is solely due to an increase in flow noise. The Browns Ferry-1 reactor has been found to be stable in all modes of operation attained during the present tests. The most unstable test plateau corresponded to minimum recirculation pump speed in single-loop operation (test BFTP3). This operating condition had the minimum flow and maximum power-to-flow ratio. The estimated decay ratio in this plateau is 0.53. The decay ratio decreased as the flow was increased during single-loop operation (down to 0.34 for test plateau BFTP6). This observation implies that the core-wide reactor stability follows the same trends in single-loop as it does in two-loop operation. Finally, no local or higher mode instabilities were found in the data taken from local power range monitors. The decay ratios estimated from the local power range monitors were not significantly different from those estimated from the average power range monitors.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 5070273
• Report Number(s): ORNL/TM-9601; ON: DE86001438
• Resource Relation: Other Information: Portions of this document are illegible in microfiche products. Original copy available until stock is exhausted
• Country of Publication: United States
• Language: English

Related Subjects

21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS
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REACTOR STABILITY
REACTOR NOISE
REACTOR OPERATION
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ENRICHED URANIUM REACTORS
MIXED SPECTRUM REACTORS
OPERATION
POWER REACTORS
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210100* - Power Reactors
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