ML19264B540
| ML19264B540 | |
| Person / Time | |
|---|---|
| Site: | Yankee Rowe |
| Issue date: | 04/14/1966 |
| From: | Norian P US ATOMIC ENERGY COMMISSION (AEC) |
| To: | Doan R US ATOMIC ENERGY COMMISSION (AEC) |
| Shared Package | |
| ML19264B539 | List: |
| References | |
| NUDOCS 8011170523 | |
| Download: ML19264B540 (2) | |
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- 'Divinion of T< actor Liuera.iry
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l{hM p:cearch & powe r F.ee ntc r Cafety Iranct Di 'nion of Reartcr Licensing
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Le Yankee reactor uns crigLnally designed to require berated prim ry l
coolunt only during enetor "otdevn, nnd long tert mactivity change:
due to. fuel @pletion wer ' connenantec for l y centrol rod pocition adjuutment.. In order to cttain lenger ccre life ez'd reduced fuel costs,
_ "'. 1Tantee has. steadily increaced the enrichtent cf the new fuel loaded enci1E chutdown (Cores 1 & 2 - 3.hy, Corer 3 & L L.1%, Cora 5 k.99
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Approximate 1,y one-half (36 elements) of the cere is changed each shut--
down. h e higher recetivity worth cf the rew ecret. required the une of chemien1 chim in addition to the centrol rod rystem during power operation.
he curren$. baron ecncentretien limit (Tech. Spec. 2-6 6) in the m in coolant system ic 193 ppm nt loc.cs n. Love 15 W e.
'Ihic limit vas celected l
on the bacin thr t it v<culd ^ct require n.ny change to the accident analyres presented in the criginn2 Final En-nrdr.": mary Eepc-t.
Thece. accidents W crctcr c:cf' eicnt cf -1 x 10-VrF. Tunkee vere analyr.ed fcr c a r
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has repcrted on
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coefficient wouiu :
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equilibri= xenan.
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~ ' ~ The ~$ elation to hurlear Sn'ety of pcsitive nyderator coefficients is ' ',
, ' a disenaced in a -et-en+ Vr-tind cr t repert, WC!?-2E %, "Fenetivity C<.-
efficients in Wer,tinghouse Prennariced Water Eet.eters".
%e new series cf Westinc; bouse mactcrc vill have ponitive cade ster coeffielente
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.during a.signifiennt partion of the initial cycle, end boren Ocn-entra-tions grenter tJum 2003 pp-nn cropred fcr re-nni =eration at pcver, he repcrt emphar.1:r.e. that the rower (dc pler) coefficiert is the primary e
'... rechanicm for ter-innting tr.nciente anc that the rectivity etances cue w
to w derator errects are limited tc rec. vane: ir teth rnte and recnitude.
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'Couc1 usions -
- ?be Toricwing conclucians can be made conetrnir.g cpertt1= cf _tne hnkee nactcr with 155 p;r ber= in the main ecc1cz.t d. rin;; the initini cc:.
cf Ctre T creriticr. (eccen-iall; nenen f e-):
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i; (1) Operation in ti'ir nrz..cr, dtboy;b cutrice cf technien!
cper d ri cr.t' ion::, did nn represent fin unrevitsed mdety 1
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tue rs.r.ierator coefTielent vec scre negative quent,1cr rint p*/CT.
thre -1 x 20-(
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' (2) The azdety of the reactor m.to Let frignificutly decreared
- r,ince the J rimar./ +a-4"' ting mechanic: fcr renctivity trimslentr, wrte providt i by the doppler coefTicient, which in indep nd<r:t ~f the Leron concent:ation.
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