ML20140J574

Application for Amend to License DR-15,proposed Change 6 for SEFOR

ML20140J574
Person / Time
Site:	05000231
Issue date:	08/05/1971
From:	GENERAL ELECTRIC CO.
To:
Shared Package
ML20140G249	List: ML20140G245 ML20140G273 ML20140G279 ML20140G284 ML20140G290 ML20140G295 ML20140G300 ML20140G306 ML20140G312 ML20140G317 ML20140G324 ML20140G329 ML20140G333 ML20140G339 ML20140G354 ML20140G360 ML20140G364 ML20140G370 ML20140G379 ML20140G384 ML20140G413 ML20140G437 ML20140G443 ML20140G452 ML20140G459 ML20140G464 ML20140G472 ML20140G477 ML20140G483 ML20140G494 ML20140G500 ML20140G511 ML20140G536 ML20140G566 ML20140G577 ML20140G582 ML20140G586 ML20140G597 ML20140G602 ML20140G604 ML20140G608 ML20140G616 ML20140G624 ML20140G629 ML20140G657 ML20140G672 ML20140G685 ML20140G703 ML20140G710 ML20140G715 ... further results
References
FOIA-97-34 NUDOCS 9705140133
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{{#Wiki_filter:,-, 4 s J* \\ e i 1 i 1 l ] Regulatory fil'e Cy. t a m,4g,g,w 7 4-l l PROPOSED CIULNGE NO. 6 i j FOR THE l ~ SOUTHWEST EXPERIMENTAL FAST OXIDE REACTOR August 5, 1971 I l i l i I 1 Re: LICENSE DR-15 l DOCKET 50-231 l l t 9 i l l r i 4 i i GENERAL ELECTRIC COMPANY l 310 DeGuigne Drive Sunnyvale, California 94086 -9705140133 970505 PDR FOIA ll VARADY97-34 PDR t ? :.e - . -?

m .) -e Proposed Change No. 6' i ( for-the Southwest Experimental Fast Oxide Reactor s I. Introduction l. j Under the authority of License DR-15, General Electric operates the Southwest Experimental Fast Oxide Reactor at a site near Strickler, Arkansas. A revision of the current Technical Specifications is desired as described herein. The applicable revised pages of the Technical l Specifications are also included as Attachment A. I i II. Proposed Changes Pursuant to the provisions of 10 CFR 50.59, General Electric requests that the SEFOR Technical Specifications be changed by substituting Pages 3.12-2, 3.12-3, and 3.12-5 in Attachment A of this document for j the corresponding pages of the current Technical Specifications. l These revisions will change the minimum allowable 20-inch travel time for the Fast Reactivity Excursion Device (FRED) from 0.085 seconds to 0.097 seconds, i III. Purpose of the Proposed Change l The purpose of this proposed change is to update the minimum allowable FRED 20-inch travel time so as to limit the maximum reactivity insertion rate of the super-prompt slug to 20 $/sec. IV. Discussion The present Technical Specifications limit of 0.085 see was the 20-inch travel time estimated to give a maximum reactivity insertion rate of 20 $/sec with a 1.3$ slug. This estimate was made prior to design changes in the FRED documented in Reference 1 and prior to in-reactor i i I l l ( 1 l

^Q r slug position versus time and slug worth versus position measurements. l At the beginning of the transient test program such measurements indicatedtthat the minimum 20-inch travel time would hr.ve to be increased (Reference 2). As discussed in Reference 2, the reactivity insertion rate can be determined as a function of axial position of the poison slug during a transient from the following relation: dk dk dx de dx de dk where gg-E reactivity insertion rate, dk gg E reactivity change per inch movement of poison slug as determined from slug worth versus position measurements. dx i gg-E poison slug velocity. The minimum 20-inch travel time of 0.097 sec, necessary to give an insertion rate of 20$/sec for a slug worth 1.30 dollars, has been determined by ratioing the rate which would have been obtained from the sub-prompt slug, if the poison section had been positioned 0.9 in. lower in the rod, a position that corresponds to the location of the poison section for the super-prompt slug. The sub-prompt slug worth with the poison section at this lower position would have been 101.1c. l Figure 1 gives the measured worth versus position characteristics of l dk the sub-prompt slug. Figure 2 shows the slope, gg, of Figure 1 and l also the FRED velocity characteristics as reported in Ref erence 2. The insertion rate that would be obtained by firing the sub-prompt slug so that the initial position of the poison section corresponds to the position of the poison section of the super-prompt slug can be determined by shif ting the velocity versus position curve for the sub-promp slug by 0.9 in., as shown on Figure 2. The reactivity l

-~~ - l 3 m l change per inch ( ) of the poison section as a function of position would not be shif ted. t The insertion rates obtai' ed by multiplying the velocity curves in n ( Figure 2 by the dk/dx curve are given in Figure 3. The maximum ) reactivity insertion rate determined in this manner is 14.4 $/sec. t l As discussed in Reference 3, the dynamic worth (as determined from reactor response) of the sub-prompt slugs was 4% greater than the static worth. Therefore, the reactivity insertion rate of 14.4 $/sec, and the alug worth of 1.011$, which are based on static slug measurements, are each increased by 4% to 15.0 $/see and 1.051$, respectively, for the determination of the reactivity insertion rate for a 1.3$ slug: I h 18.5 $/sec 15.0 = 1 N i i The calculated reactivity insertion rate of 18.5 $/sec is based on a FRED 20-inch travel time of 105 msec. Smaller 20-inch travel times would yield larger reactivity insertion rates. Since the insertion l rate is approximately inversely proportional to the 20-inch travel time f or small changes in the 20-inch travel time, a travel time of j 97 msee yields an insertion rate of 20 $/sec. This rate provides significant margin with respect to the rate of 50 $/sec (with a j dk i sodi,um-out Doppler coefficient, Tg, of -0. 004) for which the safety of the plant has been assessed (Reference 4). ] i i i l The average 20-inch travel time for the FRED is 105 msee with a l statistical standard deviation of 1.7 msec (Reference 1). As dis-cussed in Reference 1, page 11, a highly unlikely series of equipment malfunctions and bypassing of procedural controls would be necessary to substantially lower the 20-inch travel times. i l Therefore, the proposed limit of 0.097 see for the 20-inch travel 1 time can be met and will provide adequate assurance thct the maximum reactivity insertion rate will remain within safe limits. I 4. I

.. ~.,.... _.. ,e*. w '. 9 f f l . REFERENCES t. . l'. " Summary,ol Results from Testing of the. Fast Reactivity Excursion i f Device," submitted to the AEC-DRL on April 12, 1971, by the Breeder Reactor Development Operation of the General Electric Company.. 6 2. Dr. K. Cohen, Letter to Dr. P. A. Morris, " Characteristic Curves for the FRED Poison Slugs," April 23,,1971. i 3. "Results of the Familiarization and Sub-Prompt Critical Transients for Core I," submitted to the AEC-DRL on July 16, 1971, by the Breeder Reactor Department of.the General Electric Company. l 4. SEFOR FDSAR, Volume II, Section 16.4'2.3. l l I ~ i I i 6 6 t i l l J d i i ! f

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