ML20049J343

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Discusses Power Fluctuations of Triga Reactor Originally Reported 810813.Mods to Primary Coolant Diffuser Nozzle Eliminated Power fluctuations.Ni-16 Levels at Pool Surface Not Affected
ML20049J343
Person / Time
Site: Kansas State University
Issue date: 03/09/1982
From: Faw R
KANSAS STATE UNIV., MANHATTAN, KS
To: Rozier Carter
Office of Nuclear Reactor Regulation
References
NUDOCS 8203150138
Download: ML20049J343 (1)


Text

Department of Nuclear Engineering 3CA24S A S Ward Hall g Manhattan, Kansas 66506 913-532 5624 Inmra:nsrry March 9, 1982 to 4% (

Mr. R. Carter p sq Standardization and Special Projects Branch gqp,ggg*j Division of Licensing 2 U.S Nuclear Regulatory Commission '

e MAR 151982> .,0 '

Washington D.C. 20555 3 gawm anum numEsa Re: License R-88 ,Y M e Docket 50-188

'W I igt '

Dear Mr. Carter:

This letter concerns power fluctuations of the KSU TRIGA Reactor, as reported in our letter of August 13, 1981. Since that time we have have conducted additional tests and measurements, and have made modifications which have eliminated the power fluctu-ations.

Prior to the tests, the primary-coolant diffuser nozzle dis-charged at an angle of approximately 20 degrees below the hori-zontal and was directed toward the top of the reactor core. On December 29, 1981, the diffuser nozzle was re-oriented so that the discharge was horizontal. At the same time the sides of the nozzle were straightened which resulted in a slightly larger out-let area.

These changes have eliminated the power fluxuations previ-ously observed. Furthermore, Nitrogen-16 levels at the pool surface have not been affected. The KSU Reactor Safeguards com-mittee reviewed these tests and results on February 16, 1982. We plan no furcher action on this matter.

Sincerely, b

Richard E. Faw, Director, KSU Reactor Facility REF:mm cc: Tim DeBey ,

T G,6 i

8203150138 820309 PDR ADOCK 05000188 P PDR