ML19241C066

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Elaborates on Conclusions of B&W 790405 Memo.Increase in Selected Thermocouple Readings Is No Cause for Concern
ML19241C066
Person / Time
Site: Crane Constellation icon.png
Issue date: 04/06/1979
From: Willse J
BABCOCK & WILCOX CO.
To:
BABCOCK & WILCOX CO.
References
THE-79-179, NUDOCS 7907260541
Download: ML19241C066 (5)
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Text

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C. T. Rc= bough :: Engineering Cperaticas.'fana;er, Action Iten 143, 4/5/~9. The purpose of :his memo is to elaborate on c nciasions no. 3 and 4 in the referenced meno. The increase in selec:cd ther ccqt ple readings is no cause for concern. The temperature is still 100'T below saturation temperature. The increased readings are causcd U by two fac:crs. The first and smalles: effec is aJ increase 1 :' the core inlet temperature. The pri.ary cause for the cP.ng; .a thermoccuple readings is the change in the fic. dis tribution caused by the shifting debris in the core. This,cas vin uly d o.... o n 3... s...: .g h e,.3 . b. 4 .a.1 p....,.. : - y,. ;. a-., A. s. e .m*.. w.. ...,.. p a e.'- :..... ,s. g. ..y ...y ..,.,1 d .,. 4, 4. e.,..

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w. Conclusion number 4 is inaccurate since resistance readings Will show wide variations frca :heraccouple to ther.occuple and also the readings will depend on whether the cbrenel or alumel wire resistance is be:..n; acasured. iic h e ve r, :. '. neede,, we can state the folicwing: A test can be performed to determine whe:her a gross failure of a thermocouple has occurred. ror a goce theraccoup.e the resistance between one t/C _,eac. anc grouna shcu,3ce approximately a.0 cr..as u while the other lead :c ground should measure appr xima:ely 300 chas to ground. JTW:mp cc: F. E. Unit Manage p J. S. Tulenko cd M f ,. c.u.n -,. s _>,, ?? QA OA t2 O.s. O t_k 7907 2 6 0syi

THE BASCOCK & WILCOX COMPANY POWEit GENERATION GROUP f To l ) Ingineering operations !!anager c:a "'*3'8 C.T. Renbough. T.:el >!:nagemen: & OcVelo?nen: F i l e !;o. Cust. or Ref. C,.,C, -,,_2e-m t CPU 2' 3&W's View of Increasing Incere Ther:ccouple Readings (Instru::ica l W April 5, 1979 i,,........................................... As reques:cd in A::1:n I e= If3, the increscing thercoccu:le data has been revicued by both ::?CD and L2C ;ctsennel. These personaci have included J.3. Andrews, G. A. l' eyer, J. A. 'Jeir.er, J.T. '!aye r, T.I.. ~.!ils :n. E.T. Chulick, ?.E. >!a cla, R.A. Capeland, J.W. Ewing, H.O. Warren, and J.C. 3revn. A su= mary of the pertinent data and their conclusions is a:: ached for D.R. Roy's response :o 31111. cue. l 4 cTx/div A -{ %i. '1 ~ ng P e e e CL u 10 4 c't~) v,1 c m Fm o'; m. ; i n - n.., ~.\\, i ,,,' ' t'G r1 1 N s j n >:,.. =e

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s '. e ] Incore ther=occuple data fres TMI-2 have been evaluated. As shewn belev, six of the thirty thermoccuples for which we have data have sho.a a te=perature rise of 7 - 33 7 over the past 5 days (117 hours) or 1.4 - oo 6.o per day. T/C at T/C at Nc: Increase Locarion 0345,3/21 0542.4/5 Increase f 7) Per Dav ( FT 13C 290 297 7 1.4 13F 293 307 9 1.3 13H ,310 320 10 2.1 11G 427 445 13 3.7 12F 303 327 24 4.9 11L 302 335 33 6.3 Temperature vs ti=e for loca:icas 137, 127, and lit are shown in the attached figure. The folleving conclusions have been reached based on this data. 1. There is no mechani = which has been postuls:cd th:: veuld cau.e decalibration :o the ex:ent shczn by the d::a. Theref::c, i: Is concluded that :he :her:ccouple readings are accur::e and thc: :ruc te=pera:ures are being ::ni:ored :o :50 .n . s.- 2. There is no:hing in the fuel, strue:ur:1 ra:erials, er fi:sien products which would c:use a che=ical rese:ica th:: veuld result in the obsc ved n:c of :capara:urc rise. 3. As indicsted in :he attached cap of tempera:ure changes for 30 selected locations, the increasing readings are loca:cd prefercatially in the core (in the center of the ri;h: half). This leads to the 20s: probable explanation that a very gradual flow redistribu:icn is occu rring; either increased flev blockage in this regica or decreased flev blockage in another regica causing :e:perature increases in this region. 4. If Met Ed questions :he ther:ccouple readings, a si=ple test can be perfor=ed. The resistanca be:veen the T/C lead and ground sh:uld be approxicatelf 750 ch=s. 549166 3 -s'" - -. "'_,i. P9 O ' l.T di ';xi D [D, ' } ["g d1 9 '*% I. R Qf ~' [4 + J \\t' \\_ \\'\\ >, \\ c0\\k$ s. n J y w

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