ML20085F519

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Change Request 13 to License DPR-4 Re New Rod Oscillator
ML20085F519
Person / Time
Site: Saxton File:GPU Nuclear icon.png
Issue date: 09/20/1967
From: Neidig R
SAXTON NUCLEAR EXPERIMENTAL CORP.
To:
Shared Package
ML20083L048 List: ... further results
References
FOIA-91-17 NUDOCS 9110220197
Download: ML20085F519 (6)
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.s-5 Ar,i. ;-; 't.;CIEla W" 1:i :.5 : ,,, s. s.uuL;ii IOCKET NO. 50 146. ,- ,.

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  • CHANGE REPORT No.13 T
1. Applicr.nt nereby :;fnita Chant.;c depc: t No.13 in ec. plica::e . ith p:,ragra!O. 3(11)1 of Idconoc DP:t-4.

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1. Tercrittien of Change Tne precent reactivity oscillator (Change Feport No.11) atty 1 retineed by a larger oscillator in a new subassently (No. XX). The ae. atassembly censists of one prescure housing thimbic with to CD of 1.66" and an ID of 1 16". A sketch nf the oscillator prote is shuen in Figure 1. Tne design is quite similar to the present oscilletor vith a movable tute inside a stationary tube. Both tubes are made up of stainless steel vith hafnium sleeves 1.6 inches vide in the active region of the core. Reactivity change is caused by hafnium sleeves in the movable tube moving in and out of the stationary hafnium sleeves. The maximum reactiity change that can te ecused with the new es.11ator is 1.3 x 10' iK/g as extrapointed from men-surements en the present oscillator.

A sketch of the pressure housing and oscillator is shown in Figure 2. The pressuro housing is made of type 316 stainless steel vith a vall thickness of 0.250 inches.

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2. Purpose of Change This large oscillator vill greatly facilitate acquisition of data (vith movable detectors) on axial variation of kinetic parameters caused by pH, and on differences in dynamic heat transfer caused by pH between cermet and cxide fuel rods and coolant (using the thensocouples in the instru-mented subassembly). Information on axial variations vould supplement data on radial variations obtained by trip tests and permit spatial evalua-

, tien of pH effect. Dynamic measurements with the special thermoeouples vould contribute to the development of a model for phenomena inside and out-side a Iuel rod.

3. Safety considerations The mechanical design of the pressure housing is based on ADE boiler code, section VIII for external pressure 2500 psi, temperature 650 F and allowed stress of 17,050 psi.
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( Impact calculatienc vere made on the iscumption that the covable tube seph-rates from the drive with maxitum kit tic energy of oscillation and falls a frem the maximum height. The stationary tute of the oscillator can, even for full stroke operation at 10 eps, absorb ar.y such impact with a maxi-num Ftress Vithin the yield strength of the stationary tube. There is no impact stresa on the pressure houring under such an accident. .

Calculations vere else made on the effects of possible flov induced vibration on th> pressure housinE. The maximum deflection of the housing has been found to te neEliEible (N 10~ in, due to parallel flow anu N 10' in. due to cross ficv), as also the stresses induced (less than 10 psi).

The pressure housinE has been tested at a static external pressure of 3800 psi.

Other mechanical details such as the con-o-seal joint at the head penetration, and clearances at fuel assembly contact points are the same as other Saxton sutassemblies. One difference from other subnssemblies is that the support tube is of a heavier valled tute which extend.a in one piece from the head penetration down and through the bottom of the fuel assembly. This structure is mechanically more ststle.

N Thermal, hydrau'.ic and nuclear effects introduced by changing the nine flux thimble assembly to a sinEle thimble assembly in a peripheral location have been analy:ed. As no power peaking is expected in the rods surrounding the esell' ..vr, no thermal or hydraulic problems are anticipated. Because of the minor reactivity effect of the oscillator and the absence of heat or fission product Eenerating materials generally, there is no nuclear safety problem asso..ated with the operation of the subassembly.

The same drive mechanism and support structures which have been operating satisf acterily for over three years with the old oscillator vill be used for the new escillator. The increased vei6ht of the useillator tube (10 lbs com-pared with 5 lbs) vill be compensated by reducing the frequency of oscillation.

In normal operation the oscillator vill be moved in a stepvise manner at ran-den time !.ntervals varying from 6 to 6' ceconds between steps. Normal force i

requirements is 10 lbs, maximum available force is 30 lbs, which is less than I

the force for which impact calculations vere perforned.

It is cur opinion that no unreviewed hasards are presented by this change.

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