ML20077F774

Informs That $2.52 Max Pulse Limit Set as Transient Rod Worth to Prevent Tech Spec Violation.Limit Accomplished by Mechanical Block & Electrical Interlock on Rod.Rod Will Be Calibr Every 6 Months Until Rod Worth Can Be Predicted

ML20077F774
Person / Time
Site:	Oregon State University
Issue date:	07/22/1983
From:	Wang C Oregon State University, CORVALLIS, OR
To:	Willett D NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
References
NUDOCS 8308030031
Download: ML20077F774 (2)

Text

7

.L .

r 3 / #fj 09] A7

~

ETe". sig.

Radiation Center University corvaiiis. Oregon 97331 (sos) 7s4-234: g, /g I'He July 22,1983 U.S. Nuclear Regulatory Commission Region V 1450 Maria Lane, Suite 210 Walnut Creek, CA 94596-5768 Attention: Mr. D. J. Willett, Reactor Inspector

Reference:

Oregon State University TRIGA Reactor (OSTR),

NRC License No. R-106, Docket No. 50-243

Dear Mr. Willett:

As agreed in your recent telephone conversation with Dr. Brian Dodd, we would like to infonn you of the Reactor Operations Comittee (ROC) decision made on July 21, 1983 with respect to the OSTR transient rod.

As you will recall, the annual calibration of the control rods detennined the worth of the transient rod to be $2.55. This is the same as our technical specifications pulse limit and an increase of 3c. If this trend were to continue and we pulsed with the transient rod carrier fully out, then it is possible that we could exceed our pulsing limit sometime in the next year.

In order to prevent violation of the technical specifications, the ROC decided to set a maximum pulse limit of $2.52. This has been accomplished as per our technical specifications by a mechanical block and electrical interlock on the transient rod. In addition, until such time as the transient rod worth variation can be predicted, the ROC directed the reactor operations staff to calibrate the transient rod every six months.

In the opinion of the reactor operations staff and the ROC these measures should be sufficient to prevent any unintentional violation of our technical specifications pulse limit.

8308030031 830722 PDR ADOCK 05000243 P PDR i

Oregon State Universityis an Affirmative Action / Equal Opnottunity Employer

~ ^

f.

D.J. Willett, USNRC July 22,1983 If you need any further information, please let us know.

Sincerely yours, N '-Q C. H. Wang Reactor Administrator, OSTR Director, Radiation Center rk cc USNRC, Document Management Branch, Washington, DC USNRC, Office of Inspection & Enforcement, Washington, DC Director, Oregon Department of Energy, Salem, OR A. G. Johnson, Assistant Director, Radiation Center B. Dodd, Assistant Reactor Administrator, OSTR T. V. Anderson, Reactor Supervisor, OSTR S. E. Binney, Chairman, Reactor Operations Committee 1

l l

l l

- i 4

L 4