ML20038B202
| ML20038B202 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 11/13/1981 |
| From: | Holder G TENNESSEE VALLEY AUTHORITY |
| To: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| Shared Package | |
| ML20038B196 | List: |
| References | |
| LER-81-039-03X, LER-81-39-3X, NUDOCS 8111240857 | |
| Download: ML20038B202 (6) | |
Text
{{#Wiki_filter:_ . . anwe vam mo e U FDAl t. Ktf0Kr - PREVIOUS REPORT DATE 9/14/81
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..g LICENSEE EVENT REPORT
' CONTROL BLOCK: I n
l l l l l lh 6 (PLEASE PRINT OR TYPE ALL REQUf RED INFORMATION) lo !1l l 8 9 l Al LICENSEE El BICODE Rl Fl 1l@l 0l 0l -l 0lLICENSE le 15 0l 0l 0l Ol -l 0l Ol@l 4lLICENSE NUMBER 25 26 1l Il TYPE Il 1l@l JO l 57 CAT 58 l@ CON'T 1011! 7 8 S lL@lOl51Ol010l2l916@lOl81117l8l1l@l1l1l1l3l811l@ 60 61 DOCKET NUMBER 68 69 EVENT OATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROB A8LE CONSEQUENCES h J o l 2 l lDurine normal coeration. while nerfoTwing SI 4.1. A-14. turbine first-stage l
,To 131 lperinissive switch 3-PS-1-81A was found 3 percent above limit of T.S. table 3.1.A. l 'lo14l lThere was no dancer to the health or safety of the nublic. Previous similar events: 1 'I o I d i 1BFRO-50-259/78016. 79008. 80058. 81029. 81032. 81038: 260/79016. 79017. 79024. 80020. I I
lo 16 ] 180057. 81030: 296/79007. 79012. 79028. 80022. 80045. 80052. 81007. 81032. l o l 7 l l Redundant systems were available and coerable. I 1 101811 80 7 8 9 CE CODE SUBC E COMPONENT CODE SUSCODE S E lol91 lI l A lh h [,,J,,,jh lIlNlSlTlRlUlh d h d h 7 8 9 10 11 12 IJ 18 19 20 SE QUE NTI AL OCCURRENCE REPORT REVISION EVENTYEAR REPORT NO. CODE TYPE NO. LE R
@ ,aj g.RO 18111
_ 21 22 1-1 23 l01319l 24 26 M 27 1013 l 28 29 M 30 [-j 31 W 32 T KEN A ON PL NT MET HOURS SB f FO 8. SU LIE MANUFACTURER [A_J@l1J@ L2.J@ lzl@ l 010 l 010 I Ly_i@ 41 l_yJ@ l4311 @ l B I O l 6 lyh 33 34 3b 36 37 40 42 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS l1 i o l lThe Barksdale bourdon tube pressure switch model B2T-A12SS setpoint had drif ted. l li li l IReplaced switch with an identical replacement and functionally tested per SI 4.1.A-14 l 1. I i i , I lon 10/9/81. Design change request 1398 has been initiated to replace this switch I Ii1al Iwith'an analog transmitter with a trip switch. A study of setpoint drift problems is I Iil$ 1 lattached. 80 I u 4 ')
'((NE power oTHER STATUS hEsIc"ov50v' oiSCovERv oESCRIPTION @
l1 l r, j d h l0l9l8l@l ' NA l lBl@l Surveillance test ] A TtytTY CO TENT aELeasto os aELE ASE AMOUNT OF ACTivtiv LOC ATION OF RELEASE W d @ (JJ@l 7 8 9 to . 11 NA 44 l l 45 NA 80 l Pf RSONNEL EXPOSURES NUMBE R TYPE' DESCHIPTION ll l71l0lolQ,,jh d hl NA l Prnsne.NSiNsuZEs Nums a w,cniPiioN@ l i l a#fl 9l 0 l 0 l 0 lhl 11 12 NA 80 l t Os5 OF OH DAMAGE TO F AGI iT V tvPE D E SCHIF TION [i l o l [2 jhl NA l t a 9 to 80
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i;g j f ESCHIPTION I e I ol [g [@l NA l lll!lIIilllIlgI H J 10 68 69 80 4
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8111240857 811113 psoNs: (205) 729-6134 2 PDR S ADOCK 05000296 PDR
Tennessee Valley Authority Form BF-17
.- Browns Ferry Nuclear Plant BF 15.2 6/04/81 LER SUPPLEMENTAL INFORMATION BFRO-50 296 / 81039 RITechnical Specification Involved Table 3.1.A Reported Under Technical Specification 6.7.2.b(2) *Date due NRC: NA _ , , _
Date of Occurrence 8/17/81 Time of Occurrence 1330 3 Unit Identification and Description of Occurrence: While performing SI 4.1.A-14, turbine first stage permissive switch 3-PS-1-81A was found 3 percent above the limit of T.S. table 3.1.A. t Conditions Prior to Occurrence: i Unit 1 in refeuling outage. r Unit 2 at 36%. i 5 Unit 3 at 98%. r Action specified in the Technical Specification Surveillance Requirements met due to inoperable equipment. Describe. None i Apparent Cause of Occurrence: Setpoint drift. r i Analysis of Occurrence: There was no danger to the health or safety of the public, no release of 2, activity, no damage to the plant or equipment, and no resulting significant
! chain of eve nts.
~
l l i Corrective Action: Replcced switch with an identical replacement and functionally
- tested per SI 4.1.A-14 on 10/9/81. Design change request 1398 has been initiated to replace this switch with an analog transmitter with a trip switch. A study of setpoint drift problems is attached.
i' Failure Data: BFRO-50-259/78016, 79008, 80058, 81029, 81032, 81038; 260/79016, 79017, I I 79024 N 0, 80057, 81030; 296/79007, 79012, 79028, 80022, 80045, 80052, 81007, l ' 81032. {
- Retention : Period - Lifetime;. Responsibility - Document Control Supervisor
- Revision:
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Subj ect: SETPOINT DRIFT - DARKSDALE PRESSURE SWITC11ES Recently there has been a number of LERs on Barksda,le pressure switches; I six during 1981, 21 since January 1978. Our commitment _ to training on ' these swit,ches has been strong and continuous, theref ore, we do not ' believe this is the problem. L Our attention was turned to the switch and the application to which it was being used. At tacbraent 1 plots the setpoint drift of 4 of these switches for a period 6f 4 years. It is readily obvious these switches l- are cyclic, being high in the warm months and low in the cold months. Attachments 2 and 3 provide the specifications for the Barksdale B2T-Al2SS switch. The important. characteristics f or PS-1-81, 91 are: Element type: Bourdon Tube Proof Pressure: 1800 psig > Rated Accuracy: 1% or 12 psig Setpoint: 154 psig - recently changed from 160 psig Adjustable Range: 77-1200 psig It would appear based on Attachments 2 and 3, the switch would perform very reliably. llowever, the reason it does not becomes apparent when Attachment 4 is reviewed. The .f ollowing conclusi. is can be drawn from - Attachment 4: u l- For our application, a piston switch is better thon a ,' l. diaphragm or bcurdon tube. Our experience indicates l the piston type Static-0-Ring to be a very reliable and accurate switch.
- 2. Bourdon tube switches are extremely sensitive to process surges. In our application, snubbers have been in-stalled to help alleviate this deficiency.
i
- 3. For greatest accuracy, the setpoint should fall in the upper 65% of the adjustable range. For the most f avorabic life f actor the setpoint should be in the
- 7 lower 65% of the adjustable range. For PS-1-81. 91:
Span - 1123 and Setpoint (% Span) = 13.7%. !- t This places these switches in the lower portion of Zone ? C, which is FAIR accuracy and EXCELLENT life. p I l* Our experience proves this correct. Other switches we
!i have drift problems with are PS-68-93, 94 They have i setpoints of 108 psig or se: point (% span) is 9.6%.
i [ In the final analysis, one ,can only conclude. a misapplication of these
- I switches, both in switch type and % of adjustable range. We recognized this years ago and DCR 1398 (12/7/77) was initiated. EN DES does not have An implementation date f or DCR 1398 as it now is tied to 79-OlB and environmental qualifications. In the interim we are investigating
;, en improved switch and will keep you informed. ,
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- D del.AVAL TURDINE INC + BAR.tSOALE C0t:1ROLS DiviSICN + 5125 Alcoa AvCnue Los Angeles
- Calal 900%
Hr.sted Bostdon f ute Modela OPERATINGCHARACTERISTICS
- ORDERING DATA
%fer fight Houset (NEMA 4) and terminal 5tr p PRESSURE SWITCHES - All values given in P.S.I.(Cauge)
Tseper proof [aternal Adjustment p,,ng Adjustable Rsage Appron. gp l ggy h (Test) lecreasing increasing 'O' Catalog Catalog tied e Pressure M,n. M a n. Min. Man. (o;rre,ential) MateriaP "" * ' ""*D I ME1 ~" ' 1800 50 1180 70 1200 10lo 20 Bronte BIT H12 02T Hl2 1800 50 1173 77 1200 11 to 27 316 81T Al213 82T A1255 4500 160 3170 190 3200 15 to 30 Dronze BlfH32 BIT H32
;A: 4800 160 3161 199 3200 16 to 39 316 Blf H3255 02i H32$$
7200 240 4715 325 4800 toto 85 316 alTA485s B2T A481$ I " 9750 325 6385 440 6500 54 to ll5 316 OIT A65SS 82TA655$ I *
" 18000 600 11450 1150 12000 275 to S50 316 DIT Al20$$ B2f Al2055
" 24000 603 17450 1150 13000 2751o 550 31 6 l
, ., -. BIT Alltoss!o2T A18055 O *"Bronas" reptesents Phosphor Bronze f ute with SA[ 83 Brass socket BIT SINGLE $tTTING B2T DUAL CONTROL "316" represent: 316 Stamiess steel Tube & Socket
"-AMINC0" female opening for %' 00 tube connection. To chaage A6555 and Al20$%
switches to M* not. add P4 sutfin to model number. Price addition requi ed. Appronimate shipping weistit 2 5 lbs. OETalt DATA tt[CTRtCAL CHARACTIR15ftC3: Att models incorporats Underwriters' Laboratories. Inc. listed Eingle pole dnuble throg snap action switching e!ctnefitt. [lettiscal fating (con-tinuous inductive) 10 amps 125 or 250 volts AC. 3 amps 480 votts AC. Automat =alle reset ty snap action of switch. For more details and other switch classes. see paites 33 35. EttCTRICAL CONNTC110m: To screer terminals on covercd terrrinal strip through %*nos conduit connector. WIRE C00lMC - PRissVRE PRI55URE CONNECT 10N: %* N P.T. internal thread except as noted**, anodels with Circuit 41: Comrrion - Purple Proof Pressures abo,e 8.000 P 31. have "AMihCO' fewe cHning for %* 0 0. tuto Normal'y Closed - Blue unnection. Normally Open - Red Circuit s2: Common- Brown AD1USTMENT INSTRUCTICNS Normally Cicsed - Orange Tura selvstment screw clock,ise to to er actuation point (saitch setting). Normatly Open- Yellow Bli D2T 8 315 ----
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! _ Ib Not e: All citer dimensons for 02T are the same as 81T Pets cet PCet t{q P t Udth arisiCO' fluail CPf uG W( Nett)".-
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l %< A rTMHMENY 4
. - HOW TO SELECT A PRESSURE SWITCH FOR YOUP. APPLICATION
) STEP 1 SERVICE tr E OF THE SWITCH Terminal hMcii pressure sw.iches are houmi and en aritti.
l'On. 're *';uipped with enrinsed term.nat titocks thas Especteo service hf e is the first considesation to be made ehm'nat'r'E t'io t a pen *,*: 'if buying and installirq enteretnl an selectmg d pressure switcli. regaidless c: the pressure junction bones. or sensitnnty desired. If the serveco ble (the r umtpr of Emplosion prrx,f pressure sw tches are cessitned with ! cavy cycles the switch es espected to operate) es one rind on er housings huvt to conform to .icrepted electncal standards less, use of either a bourdon tube c,r diaphragm snatch is m isotating the umt?. fenm explosive atmosphere. All cu-indicated. il a service hfe of more than one miNeon cycles plosion pecot enodels are courpped with termmal blods is desired, a proton switch should be used/An exception for convenience in wirinC. to this rule may be made whern pressure change in a sys-tem asirefy shght (20% or less, of the adfustatste rance). STEP 5 SELECYlON OF ADJUSTABLE RAftGC Uncerl such conditions a bourdon , tube or diaphragm switch can be used up to 2.5 millica cyctes tvefore metaf The term ,, working range" defmes the pressure rance a fatigue, switch may see under nortnat workmg conditions this is A second consideration in choosmg a pressure switch as normally the adjustahte rar ge, the speeo of CYCL *S. regardless of the service hf e. If a for greatest accuracy the set pomt should f allin the upper switch is espected to cycle more than once every three gg g seconda, a pisten type switch should be specified. The factor the set point should te in the lower 65% of the metal of any bourdon tube of Claphragni acts as a spring adjustable range. Therefore, the most favorable combina-which will heat and fatigue in entremely fast cycfmg tion of accuracy and life facter lies in the rmddle 30% of operations, thus shortening the life of the switch,
- the ediustable range (scc diagram) This general rule The media to be centtolled must slaays be considered apphes both to diaphragm and bourdon tube pressure when selecting a pressure switch and.to simplify selection, switche s.
wetted materials for each type of swetch are noted on applicabie Catalog pages, t ice acNaser s Ort stWr rent 4 ,,,,
'8ws8 r rLn Uit seurs fW C v e=
PROOF PRESSURES STEP 2 Choice of the type of pressure smtch to be used - d.3-
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p*1ragm, bourdon tutie or piston - also must be governed C""
"*-r naassure to which it will be subjected. f Proof [
'"**sure that will over be . :l -
j, n arbered that. l wnstant oper- l although a pressure ggawgs en.9 y .*""* -o
/jg / ll emig pressure, there may t;e surges go.ng througn a sys- w,,,
tern that are dampened out by the onface m the Eaun 5 - t~ Diaphragm and bourdon tube pressure switches are en-tremely sensitive and would be affected tsy those surges. l !' , 3 M Darksdale drapnragm switches are available in an adjust- - at,te range from vacuum to 150 psi with proof pressures af,' f 'N.( i_ to 300 psi.Herksdale bourdon tube switenes are art i u. table , S ** {l 6 to 18,000 psiwith proof pressures of 24.0M psi. Berksifale 'l$ ;*h l ' ,,,,,,.,, piston switches have an adjust =hte rae.go tr.,12.000 pse ; ai c . *' with a proof pressure of 20,000 psi. wi.ci /p_o..! r.u .or coco Feneur ia - FUNCTION OF THE Swi1CH
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- STEP 3 The function of the switch is another determmm,t factor in mahmg is selection. Thece types of Darkssaia presuire switches, based on function, are itescribed below. HOW f 0 7EAD CMALOG NilhtDERS OF (1) Singte setting pressure switches sense a smete rres- DIAPHitACM sure source and open or close a smgte efect9ca r circuit
- by means of one snap ection electrical switch. g g g g, l c. (2) Pressure difference switches sense a change un refa-
! tionship between two variaL4 contained pressures and DIA. SEAL PISTON l open or close a single electrical circuit by means of one PRESSURE SWITCHES ! snap action electrical switch. (3) Dual contret pressure switches serise two prcuure m ura meen
. ; hmits frorn a single pressure source and open or cfose two r,,,,,.,,,,,,,,,,,,,.,,y.,,,,n,,,,,,,,,,,g,,p.g,,s.,
- independent electrical chcmts by means of two snap action i,,, ,,, ,, s,. ,, i . s.. , s,ii.., p . t,, ,i c.c. .
electrical switch es. r, .. weg s. sm, , ii . w.m n....s ma j r . a.sm,.sn .e n ,as .a s . .a e.s
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, e TYPES OF HOUSING AVAtt.ADLE STEP 4 ete *
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! l Stripped pressure switches are basic Barksdale peessure *****88"" switch units without housings. TPey may be used whereves j'" atectrical enclosures are atteady available and are tevorrei by original eWpment manuf actu rers for uso m t.ommon -- Olt $1055 UL si,.g cabinets featurally, stripped switches may be purchased ,,, ,,,,,,,,,,,,, , , , , , , , , , , u ,, ,,,,,,,,,,,n,,,,,,,,,,,,,,,,,,,,;.,,,,,, o.. *as;te:s. at a lower cost. *
..e fo w b..iiastw s'ws Hous'eY p'ress6re switches are comt)letely enclos.wf to s. %. .~ . ,,. .w . o ti n s 'c s < v
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4.o.d possibie narard inom iew w.res in c.veen soc . ...i....,,,........, l tions, s I .
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