ML19221A584
| ML19221A584 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 04/02/1979 |
| From: | Perrone P BABCOCK & WILCOX CO. |
| To: | |
| References | |
| OLS-790402-1, NUDOCS 7905230244 | |
| Download: ML19221A584 (2) | |
Text
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Stctus of Piant Gia;nostic Raasurwents to 03%
1 Igril 2.1979.
19ril 2,1979
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Tne-folic.fr.g 91=arizes the status of RDS cc surr.mts on the plant.. Suggest
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transsittal to Tergars at the Site and Tech Support Grc:0 i
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Pr m ure Moise, i
W h,we cenaccted to the tride-rangs pres:ura transrittars in the A and B locp. Our ecaipt= ant n?tsures the DC (steady state) valua of this pressura t
transnitter, giving an indicatica sintiar to the Centrol P.3 n readcut of j
pressura leval. lia hwe also extracted an /_C sip:1 by iuvirq the CC l
valu2 ar.d a=plifying the AC cr rrafsc centent of the signal for teth cf t.%se transnitters. Ti>2 results of t.%sa c2nuremnts are st.::arized as folice;:
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Since about 1503, on the 31st, the trida-rc c A prescura r.oice fus sham an oscillating cocpenent en top of the DC Inval. This cccpenent has h2d tha characteristic t^.at the c:cillation appiita is ca::ima when the steady state-value of pressura is m fort. The oscillatica.
l is minisus v. hen the ste dy state value of presp is afnin:2.
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The a:plituda of the oscillatica has increasec8 rmicately 13 pil pent to peak to ICO psi peak to peat in the ti2e frc:s approximtaly l
1700 on the 31st to 0600 on April 1,1979. Porsr sp : tral density i
plots indicate, in addition to broad band las frequcncy content, a
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spectral peak at 6.8 hertz.
1 b.
At a ti:ss betraen 1453 and 1507, on April 2.1979, the 100 psi peak k
f to peak c:ciliation on wide-rangs A has been occurring centinoonsly ragardless of the steady state pressure value. The spectral characteristic runirts the same, na:::ely 1 car frequene,y broad band plus pesk at 6.8 hertz.
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We have also ses a spectral peak at 6.8 hert: in the leap B wide-ranga pressure transmitter and the 1cep B flow delta P transmitter.
The loop S tride range pressure trans:ritter exhibited the sa:n O
coming and gsing of these oscillations until 1500 cn April 2,1979.
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R2 uve c@.*ised by Nitti, that his calculaticr.cl wtri on butble valme Wduction sh vad the hbMo r.ent t3 1r3 voluxa at apprcxinately the m tir.a co April 2,1979 tut wa r.cticcd the pr~ssure oscillaticns ccntir.uing ca a steady 6tsis, e.
I hve regzsted Engherirq (Pryor) to dotaruine d>at th2 cause-of 6.3 Pertz escillaticas in the pressure transcittars ami ficv:
tranicitters could be. Allic.co Ms airo tcw recuested to datemiro cat =e of th: Fhar.c:c.a.
2.
tr,s:e Parts $Lwitoring P.:G por enn:1 have se:cessfully rcrir6d nine of the tucIva la s3 prts cczitor char.r.21s tr.d ara praviding ccatinuing survaillance for abnorml locse p:rts indiccticas. Since the b2 ginning of this acnitoring tha evening of tM 31st, accalerox.aters loc:ted at the tcp and bettcc:: of the res: tor nssei hava givcc no fr.dication of icosa parts and have produced caiy the stundt of fic;r naise. ThO accelerc.r.eter at the top and bottcc of the stean ge."arator hava providad a peri:dic ryt1=fc icctrsctive-like reed uhich has grad'., ally d!rinished until the point nas diere it is ter21y perceptable. The accelero 3ters ct the top and bottc= of the A stam geacrat.:r brea pmided noisas indic3tive of fics and th:t lo:p pl:s scio low icvel cachanical tinkling scu.ds. As of C200. April 2.1979, th: =2tallic scuads in the top of the A st2am ga.Trater acceae (by lister.fng cc:'?criscas) to haya in:rcased. W2 am perfcrcing qumtitatt ce naasurer.mts ct this tine, to datartirc siSFificanc?.
a.
L*e hr/a provided precedure input recmMaticas to the Systed per;1e-for ap;:ropriate sanitoring to ba dona undar eny planned picnt evolutio.s.
3.
Transritter Health Pbnitoring Per request of the Ir.stncentation pacple, u2 are tenitorfr.g t?.e steady state and noise values of the pressurizer level transmitter, the 013G B stera prestur2 transmitter ar.d the vida-rzaga A pressum transsitter.
Evaluatien of tha noite levels on these signals is huittative of impen::ing failure of the transz:ittar. Results so far.indicata transmitters are satisfactory.
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