ML19261D827

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RO on 790608:percent Power Meter Stuck at 98% Full Scale & Would Not Have Scammed If Power Had Exceeded 98%.Caused by Dust Inside Meter Movement.Movement Cleaned & Checked for Proper Operation
ML19261D827
Person / Time
Site: Pennsylvania State University
Issue date: 06/25/1979
From: Cunningham R
PENNSYLVANIA STATE UNIV., UNIVERSITY PARK, PA
To:
Office of Nuclear Reactor Regulation
References
NUDOCS 7906260467
Download: ML19261D827 (1)


Text

Tile PENNSYLVANI A ST ATE U NIVERSITY 207 01 D MAIN llUll DING UNIVI RSITY PARK. PLNNSY1 VANIA 16502 Yke PicssJcm her Aic.a( W $14 Rewarth anJ (n Juale StuJics hb5 6H2 25 June 1979 Operating Reactors Division of Reactor Licensing U.S. Nuclear Regulatory Commission Washington, D.C. 20555

Reference:

License R-2, Docket 50-05 Gentlemen:

On June 8, 1979, during a routine daily checkout of the reactor instru-mentation, it was discovered that the percent power meter stuck at 98% full scale and would not have scranmied had the power exceeded 98%. Amendment 16 to our license requires us to inform the Commission of any incident or condi-tion relating to the operation of the reactor which prevented or could have prevented the nuclear system from performing its safety function as described in the Technical Specifications. llence , the problem was immediately reported to Region I by a phone call from Dr. S . 11 . Levine to Mr. Larry Briggs, 10:30 A.M.,

June 8, 1979.

Disassembly of the percent power meter revealed a collection of dust in-side the meter movement which increased the internal friction in the meter preventing proper operation at the upper end of its scale. The meter move-ment was cleaned and checked for proper operation and returned to service. No further deficiency with this system has been observed.

The discovery was made during checkout of the instrumentation; therefore, the reactor was not operated with this condition. It was operated again only after the repair was effected and the system checked to assure proper operation.

Sincerely yours, m '

J

, ' > f[ <... ~ A e. ..Q l U < V,7 R. G. Cunningham Vice President for Research and Graduate Studies RGC:hml cc: I. B. McMaster 7908260 %~/ f