ML19322C314
| ML19322C314 | |
| Person / Time | |
|---|---|
| Site: | Crane, Davis Besse  |
| Issue date: | 11/22/1976 |
| From: | Randy Baker BABCOCK & WILCOX CO. |
| To: | Jonathan Evans TOLEDO EDISON CO. |
| References | |
| TASK-TF, TASK-TMR NUDOCS 8001160836 | |
| Download: ML19322C314 (2) | |
Text
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.e m T wr4 Mr. J. G. Evans, Station Super: f.;.acen. _g-o i, ,h*.i,,' TDavin-Besse fI;uclear Power Stat'4*' ~ - - - ' ~- @ $ $ h,[ 5501 I; orth State Route #2 j-g I OsX Harbor, Ohio h3kh9 Subjeet: 'Ecco==endations for. Avoiding PressurizerTOffsSeale Indicationsi ~ i Nar Jack: Experience has shoun that the BLW 177 Fuel Assemb3y Plants with the precsuriser . leyel indication range of only 320 inches are susceptitle to belov :ero level: g indientionsson reactor / turbine trips and load rejecticn transients. Dur~Cen- ..h trol Analysis, Unit in Lynchburg has reviewed this problem and provided the fol-b lovingigene'ric resolution: For a plant. vith no:::al operating level of the pressuriser of 1c0 +LO 1. ~ -c0 inches,t raise the nominal. level) to 200 + 20 inches rather than 180 inches. Operating histor/ of automatic pressuriser level control shows a deviation of approximately +_10 inches. A.y addi.icnal increase in level vill be in conflict with the assumptic::s c=plo' fed in the Anticipated Transient Without Scra: study for the IEC. 2. The amount of blevdown of the steam safety relief valves has been assuned to be 5% or approximately 50 psi for the safety v-lves with the lowest setting (1050 psir;). Measured stesa line pressures at operating plants of this type indicate that the actun1 blowdown is about 75 or 75 psi and even as large as 6.55. The ninimu= reactor coolant system average temperature folleving r. reser.or trip should not decrease belev Sh8 F and the minimum stean cenerator dis w.r c prescu: c sgulf._.e.xtecLO~[5. psic at the same time. Snould the tea-I sured, steam, safety, valve blevdown exceed 70, the valte blevdowns m<should be, readjusted to approximately 5% at your earlie'st convenience. ^ i .N'e&WhX -h' Rh-.* h5$2KY.E$. QD QW.C '$s.ET .Y5.W. y-q QQ~ }' g! EXHIBIT 3 . j h. d., page 1 of 2 _, Ap t L oui _( 8ooneo 736 , <- 7., ;.,.,9..,... -s. ,. p.;..., y,.,.... ;;:..:&,.;;g,.
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r e' a f.CM !TOO Dabcock & WilcoX 620-0022. !!cyc=ber 22, '.97o Pace 2 The pressurizer level alar:s,shoulLre=airi.,the sc=e with_the exception er Thet, low _ level.l alarm should be raisedIto J80 inchesi th2 lov level alar =. 4 Pressuriser alarms are selected with an adequate marcin frc= 160 inches. for the operator to take action before the pressuriser level acnieves a i critical high or lov value. This change vill increase that mars n. I=ple=entation of these reco==endations vill require chances in Plant Se:- / /' ', points, Plant Limits & Precautions, and all procedures with a reference to 7 ?jj) nor=al pressurizer level and pressurizer low level alar = sespcint. If yo'd have an/ questions in this matter, please do not hesitate to call. Yours truly, .o R. . Baker, Jr. Site Operations Manager ?J3:FIS:nif cc: W. H. Spangler J. A. Laue E. L. Logan R. L. Pitt=an E. R. Michaud R. W. Winks E. C. Novak, TECo J. D. Lenardson, TECo EXHIBIT 3 p' age 2 of 2 O 9}}