ML20198E376

Submits Daily Highlight.On 860517,18 & 19,Unit 2 Tripped Due to lo-lo Level in Steam Generator 2A & hi-hi Level in Steam Generator 2D.On 860517,Unit 1 Tripped Due to Too Many Control Rods on Dc Hold Bus

ML20198E376
Person / Time
Site:	Catawba
Issue date:	05/19/1986
From:	Jabbour K, Javvour K Office of Nuclear Reactor Regulation
To:	Harold Denton, Eisenhunt D, Lyons J NRC
References
NUDOCS 8605270359
Download: ML20198E376 (2)

Text

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MY 19 W Docket No. 50-413/414 MEMORANDUM FOR: H. Denton* R. W. Houston F. Rosa D. Eisenhut* D. Crutchfield V. Benaroya J. Lyons* E. Rossi E. J. Weinkam H. Thompson

• G. Lainas L. Rubenstein*

F. Miraglia* T. Speis G. Lear R. Bernero* W. Russell B. J. Youngblood G. Holahan* J. Milhoan S. Varga T. Novak R. Ballard V. Noonan F. Schroeder C. Berlinger THRU: B. J. Youngblood, Director PWR Project Directorate #4 Division of PWR Licensing-A FROM: Kahtan Jabbour, Project Manager PWR Project Directorate #4 Division of PWR Licensing-A

SUBJECT:

DAILY HIGHLIGHT Catawba Units 1 and 2 On May 17,1986, at 7:55 a.m., Catawba Unit 2 tripped from 15 percent power on 10-10 level in the 2A steam generator. It returned to criticality at about 8 p.m. the same day.

On May 18,1986, at 9:47 a.m., the main generator was lined up with the grid and producing its first electricity. At 11:24 a.m. the operator manually tripped the reactor on hi-hi level in the 2D steam generator. Da May 19, 1986, at 4:20 a.m., the reactor returned to criticality. At 2:10 p.m., the Unit 2 reactor tripped on 10-10 level in the 2A steam generator.

On May 16, 1986, at 1:43 p.m., the Catawba Unit I reactor returned to cri ticality. On May 17, 1986, at 2:38 p.m. , the reactor was at 44 percent power when two fuses failed in the rod control cabinet. While Duke's maintenance personnel were in the process of replacing the fuses, they placed too many control rods on D. C. hold bus. This caused negative rate flux and resulted in reactor trip. The reactor returned to criticality at 4:28 a.m. on May 18,1986. Currently, it is at 100 percent.

Ib Kahtan Jabbour, Project Manager PWR Project Directorate #4 Division of PWR Licensing-A PWR#4/lbDPWR-A Y

PWR#4/DPWR-A KJabbour:lr {1nBJYoungblood 5//}/86 5/jq /86

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