ML20077R609

Proposed Tech Specs 3.1.1 Re Normal Power Fluctuations While in Servo Mode & Steady State Operation

ML20077R609
Person / Time
Site:	Armed Forces Radiobiology Research Institute
Issue date:	08/16/1991
From:	ARMED FORCES RADIOBIOLOGICAL RESEARCH INSTITUTE
To:
Shared Package
ML20077R492	List: ML20077R490 ML20077R609
References
NUDOCS 9108230199
Download: ML20077R609 (1)

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.8.0 LIMITING CONDITIONS FOft OPrit ATIONS 3.1 IlEACTOR C011E PAft AMETEitS 3.1.1 $,IEADY STATE OPPR ATION Aeolleabilitv This speelfication applies to the maximum ree tor power attained during steady

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state operation.

Objective To usure that the reactor safety limit (fre! ternperature) is not exceeded, and to provide for a set point for the high flux limiting safety systems, so that automatic protective action will prevent the safety limit from being reached during steady state operations.

Sneelfie ntions The reactor steady state power level shall not exceed 1.1 rnegawatts. The normal steady state operating power of limit of the reactor should be 1.0 megawatt. For purposes of testing and calibratlon, the reactor may be operated at power levels not to exceed 1.1 megawatts during the testing period.

MA!.[1 Thermal and hydraulic calculations and operational experience indicate that TRIGA fuel may be safely operated up to power levels of at leut 1.5 rnegawatts with natural convective cooling.

3.1.2 PULSE MODD OPEll ATION Apollenbilltv This specificatinn applies to the maxirnum thermal energy produced in the reactor as a result of a prompt critical insertion of reactivity.

DMettlu The objective in to usure that the fuel temperature safety limit will not be exceeded.

Sceelfiention The maximum step insertion of reactivity shall be 2.8% Ak/k ($4,00) in the pulse mode.

Dn is Bued upon the Fuchs Nordheim mathematical rnodel (cited by C.E. Clifford et al. In the April 1961 GA Report #2119, "Model of the AFRRI TRIGA

Reactor"), an insertion of 2.8% Ak/k results in a maximum average fuel temperature of less than 550'C, thereby staying within the limiting safety settings that protect the safety limit. The 50 C margin to the Limiting Safety l

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