ML19331D957

Ro:On 800803,entire Holding Tank Failed to Meet Primary Tech Specs.Caused by Inadvertent Entry of Approx 400 Gallons of Water Failing to Meet Primary Specs.Holdup Tank Drained & Water Meeting Primary Specs Returned to Tank

ML19331D957
Person / Time
Site:	University of Missouri-Columbia
Issue date:	08/29/1980
From:	Brugger R, Mckibben J MISSOURI, UNIV. OF, COLUMBIA, MO
To:
References
NUDOCS 8009040406
Download: ML19331D957 (2)

Text

I Research Reactor Facility UNIVERSITY OF MISSOURI pesearen Park Columena. %ssoun 65211 August 29, 1980 reiepnene cio 882a211 Director of Licensing U. S. Nuclear Regulatory Commission Washington, D. C. 20555

Reference:

Docket 50-186 University of Missouri License R-103

Subject:

Report as required by Technical Specification 6.1.h(2)

Description On August 3,1980 while attempting to make reactor grade water using the building demineralized water system, approximately 400 gallons of water not meeting primary specifications was sent to the holding tank. . An analysis of the tank showed that this inadvertent addition caused the entire tank to fail to meet primary specifications. Further operation would have been in violation of Technical Specification 3.10.b and the reactor was shutdown.

Analysis The reactor make-up water system provides primary make-up water to tne reactur. Primary grade water is made by running the building domestic water system through an H-OH demineralizer resin bed. It is then held in storage in a 6000 gallon holding tank. This same demineralizer bed is used to supply water for the regeneration of the pool and primary ion exchange resin keds.

On August 3,1980 at approximately 2100, the system was started up to make water for the make-up water storage tank. The previous use of the building de-mineralizer bed had been the regeneration of the pool ion exchange bed. When this evolution had been completed, the valve line-up had been only partially secured with the bypass valve around the conductivity cell controlled solenoid valves left open. When flow through the bed was initiated, it went directly to the holding tank vice the drain. When the mistake was realized, flow was secured and the hold-up tank sampled. Conductivity measurements indicated 4 micro mhos/cm.

This no longer met our primary grade specifications and the reactor was shutdown.

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Dorector of Licensing August 29, 1980 Page 2 No unreviewed safety question resulted from this occurrence. The reactor was immediately shutdown when the problem resulted. A sufficient water in-ventory existed up to the time of shutdown to assure safe operation.

Corrective Action The hold-up tank was drained to the waste water system and water meeting primary specifications was returned to the tank. When sufficient inventory existed to meet the Technical Specification for greater than 2000 gallons of primary grade water, reactor operation was resumed.

The procedures involved in handling the demineralized water bed was re-viewed and a step adding a check of the bypass valve was added to the procedure.

The importance of properly sticuring a valve line-up following completion of an evolution and verifying valve line-ups prior to operation of a system were re-viewed with the operating staff.

Sincerely, ,

p %Y/ /' W v r &-Y V . JC. McKibben Reac, r Manager Endorsement Reviewed and approved:

Robert M. Brugger Director JCMK:vs cc: James Keppler, Director Regulatory Operations - Region III Reactor Advisory Committee Reactor Safety Subcommittee Document Management Branch, NRC '