ML20024C794

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Once-Through Steam Generator Tube Problems
ML20024C794
Person / Time
Site: Oconee, Crane  Duke Energy icon.png
Issue date: 11/15/1977
From:
BABCOCK & WILCOX CO.
To:
References
TASK-*, TASK-GB B&W-0794, B&W-794, NUDOCS 8307130334
Download: ML20024C794 (38)
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J 3 III. PAST SEQUENCE OF EVENTS l Letter sent to 177'FA plant customars recommending more frequent NI calibration p - August 1976 checks. - ',h ':rJ Letter sent to 177FA plant customars - March 1977 -umtions and providing more detailed surv. m = = 'g]j reinforcing previous rev-B__m-- - May 1977 con + mining proposed revision to nau

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l E Information meeting held in Lynchburg .j s - April 1977 with 177FA plant customars to discuss ~ . =q March lettar and obtain custcmar feedback. ...he d ;1 E "..."'3 2.b Letter sent to 177FA plant onstomers i * )+ 1-N ~ 3+mnAmed Tech 3pecs og WI natihratica ' D,% for comment. -*.8* g' 'W5G r - I'^hy,e. Letter sent to 177FA plant sestamerschanges to Tech ~ - October 1977 - otetaining r- _ C - 'ad Specs and Operating Procedsres. . k ;..J i W. ~ 9ak*M:, ..94 c %'N

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A i 1 j Reconnended Changes to _ Technical Specifications W NI power range calibration to heat balance should be l. 1 checked.a minimum of once per shift. i ! T d A re-calibration is required whenever a calibration os 2. check shows that the heat balance power exceeds the NI ,.l N indicated power by 2tR*P or more. V K e 9 5 The safety analyses for this plant was perfn M [ Nota assuming a maximum calibration error of 4%RTP (heat ,..N II balance > NI indicated power) in the RPS setpoint.] it? '(

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a &..M ll$ 'Reccumended Changes To Operating Procedures _ t '(.. A. During Startups )? Check NI power rants calibration at power levels of15-30, 70 g 1. approximately Thermal Power (RTP). ' ",;?. A NI power range calibration should be performed its ,r 2. Heat Balance (H3) minus NI indicated power [,> 24 RTP g' ~- q at I a) p 04 RTP aff j 15-30, and 604 RTP calibration checks. 53 minus NI indicated power [> 2% XTP at 90 W M ot p b) <-2% RTP i (.' RTP calibration checks. , z~f. , Jl Steady Stata Operation (Power level maintained within StRTP 7 ". band and no changes in red indez > 154 since last < m14heatica..E + 3. r ja. xt a ~~- M). i-%. Check WI power range calibration once per' shift and

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g y 1. recalibrate, if necessary, in accordance with Tech.- - ;$y O g n Spec. limits. f .M ~ L Power changes > 54 RTP and/or changes in Bod Indaz > 15% =fae* ,' f.... C. , i 'I-[ last calibration check. Check 5I power range calibration after rekching . - dl,m;o- 'i 1. i a: -4 with Tech. Spec. limits. chedes - hti In addition to first check, a =hh of two addi+4aami i ih....yf should be performed at 2 to 3 bour intervals to c ~ 2. At This additional checking abould con-two consecutive checks show that further recali- .d ', t . limits. ~ in Teeb. S f' tinue unti t bestion is not required. _M1 d,, kti NI Power Range Calibration Without the Computer .E D. If the computer is not available for beat balance omienistioma, -,F Tech. Spec. calibration limits should be adjusted in secordance s l method with the accursey of the hand heat balance calculatio i y-l .t A check shows (Eand Calc. Es minus NI indicated power) > (4tRTP sinus R3" C L ' - I' t r Accuracy * (tRTP]) l

  • A value less than 2t ATP cannot be used without prior NRC approvale;

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4 ~ i V. cuu s.dT PICGRAM .e ..l ^ Calculational code is being developed to investigate p,,.},' h 14.'k the combined effects of power distribution and A. dt tor response. Results ,1 Q , property changes on out-of-core e ec f "t ' t ian ,g will be used to determine magnitude of em14hration pron ~ g.- on feed-and-bleed type plants. p - t' and remote . r Conceptual designs for auto calibrator ( AT) . ' 2,. J. m i calibration devices have been developed for wy sH M 3. ?.g.,,, 'if IIjg Decision to continne work on these items will be., plants. implementatica of ',,.p g j Cg haamd on the extant of problan following ",;f D M r~ 5/

71 new Tech Specs and Operating Procedures.
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.? INTER-OFFICE CORRESPONDENCE en-st Q C3f3 _ Crystal liver meelear Plant satu testi jj Qj teffitti d SB8888T: Excessive CID mrvesent at 1 Steady Stata Power 9' patt: November 10, 1977 rg to: C. P. Deatty, Jr. 3=P-3 ) f

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e5 k, ,I I Escently, a stedy was undertakes to try and limit asetrol red datseEven th -j -l J,' envenant at steady state power. field changes for ac flow deedhead filter ta feedwater yeay ratis, delta Tc deedhand fittar and Teve integral deedband filtar, we ears 74 H still asperiencing red movesamt every ese aimetas. on sevember 8,1977, we installed a deadbagd fittar es turtriae ,s'f,] 4 header pressure error (ees attached schematic) and renewed the RC deadhead filter. Daring the east . 'g N bt w i'k flow deadband filtar and delta tt: At one Istarvsl, Y 54 D'F 24 hours control red drive aowesent had seased. The seit was at (nota: there was no movesset for weer four beers. i 'h 1001 FF and eteilibrium mesoa.) l ./.,{* Os mmm6er 9,1977, a-3 esperienced a 501/ min. to 801 FF reehackn. les i t .a _: d.e ta 1....f a f est.r h.eet.: co.p. i sed. (y the wait emoothly sed so escassive oscillations were exper as .' Y. ? A ff/, &f- ' s' L L 0. Toget Computar see Castrela Eastener ~. h EDT/ib attachment ll C. L ifestafor 's >., 'C I ze: h, .f; l '. i ,f l

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