ML20009G160
| ML20009G160 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 07/24/1981 |
| From: | Holder G TENNESSEE VALLEY AUTHORITY |
| To: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| Shared Package | |
| ML20009G142 | List: |
| References | |
| LER-81-028-01X, LER-81-28-1X, NUDOCS 8108030384 | |
| Download: ML20009G160 (7) | |
Text
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- u. s. NUCLEAR CEGuLATORY C00secespeces tRcFgRt4 sea. UPDATE REP 0JtT - PREVIOUS REPORT DATE 6/25/81 j (7 771* LICENSEE EVEMT REPORT CONTHOL BLOCK: I I l l l l 1h 6
(PLEASE PRINT OR )YPE ALL RE!uf EE3 INPZesATIONI l @
[o l t l l Al Ll Bl Rl Pl 2l@IS0l 0l -l 0l 0l 0l Ol 0l-l 0l760 @ 264 l 1 l 1 l 1 57 CAT Sil LICENSE TYPE JO 44 LICENSE NuMSEA 7 8 9 LICENSEE CoOE
- i CON'T 101 1 y',"c' LIJ@l 01 510101012161 ooCKET NuweER 88 ol@l 88 016111118111@l EVENT oATE 74 79 017oATE RSPoRT l 21418 80 l 1 l@ .
i
'/ 8 eo el EVENT DESCntPTION AND PROGA8LE CONSEQUENCE 5 h SI 4.2.B.8, l Q l Durine a maintenance outane. while oerformina routine surveillance test. ,
@Ti'l I reactor high-pressure switches _ PS 68-93 switch 12 and PS 68-94 switch #2 controlling j 9
1 TOTT] I shutdown coolina valves of the RHR system were found above limits of T.S. Table 3.2.A.)
There was no danger to the health I e ITITI l_ The areatest out of tolerance was 6.5 percent. i i
BFRO-50-259/7816. 7908, 8058, j
@ l or ==fety of the oublic. Previous s4=11mr events: )
l'oTTlI 8129. 8132r 260/7802. 7917. 7924. 8022. 8057. 8123: 296/7907. 7912. 7928, 8022, I {
loIail 8030. 8045. 8052. 8107.
NE yon su N E couroNENT COct OE 5 C E l,o,1,2J.
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L EVENTYEAM I8111
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a 27 10111 25 29 px y1 y3lj EN" 'EYS oVIEr *Ee E Bo' e5IsSus. ET uAYNAcEden A
- fe'TYw Nouns l 0 l 01 O f g g g l15l0l6[9lg CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h I i l o I l Setpoint drif t. Setpoints on the model B2T-M12SS pressure switches were reset to thej Addi- 1 t, roper value, and the survei.llance instruction was completed satisfactorily.
L' ).1.) I j
i7 I tionally, a design change request (DCR 1398) has been' initiated to replace these
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Lij,1) I switches with an analog transmitter with a trip switch.
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' Activity ColrENT '* "
LOCATION op MELEASE @
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- 9 W@l 8108030384 810724 NRC USE ONLY
' eusti$7v PDR ADOCK 05000260 otsCniefioNh S PDR g l ; ; ; ; g g g {g 3 l.d.13 ! esvehl_ 68 69 30 g a
- al 9 10 Gene Holder (205) 729-6134 6, PHONE:
NAME OF PREPARER m
Form BF 17
-
LER SUPPLEMENTAL ISFORMATION e Table 3.2.A :
n t. ItO -r,0- 260 / 81028 R1 T+ chaical Specification involved .
- Date duc 14RC:_,NA .
Itcported Under Technical Spec;fication . 6.7.2.AO)
. 0920 1115 Unit 2 $,
l)are of Occurrence _6/.1._1_/_8_1__ Time of Occurrence 7
Idt ntification and !)c.s cription of Occurrence:
Durinig ~St 4'.'2.Y.T,"reac'toiT1gh pressure switches were found above T.S. limits. ;
At 0920 PS 68-93 switch #2 was found at 124 psi; at 1115, PS 68-94 switch #2 was found at 131 pai. Test limit is 123 ysi, which is the limit of 115 psi a l.
plus 8 psi water leg. 4 e
Conditions Prior to O_ccurrence:
Chit I ref~ueling outags~ ,
Unit 2 maintenance outage. I f
Unit 3 at 100%. !
I i
i Action specified in the Technical Specification Surveillance Requirements met j-
.due tc inoperable equipment. Describe.
=
None 't I
p.pp.trent Cause of O< currence: . j Setpoint drif t. -
1-An3hsis of Occurrence:
There was no danger to the health or safety of the public, nh release of actirity, no damage to :.he plant or equipment, and no resulting significant chain of events.
fjorr,!.ctive Act_io,n : Setpoints wer'e reset to the proper value, and the surveillance instruction completec' satisfactorily. Additionally, a desigir change request (DCR 1398) has been initiated to replace these switches with an analog transmitter with a trip switch. A study of the setpoin~. drift problem is attached.
t l
BPd) 50-259/7816, 7908, 8058, 8129, 813"; 260/7802, 7917, 7924, Failure 80zz, cuai, Data:8123; 296/7907, 7912, 7928, 8022, 8030, 8045, 8052, 8107.
j Period - 1.ifetime; Responsibility - Document Control Supervisor 3etention:
- Revision: .-
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1 . . .
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Subject:
SETPOINT DRIFT - BARKSDALE PRESSURE SWITCllES *
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Recently there has been a number of LERs on Barksdale pressure switches; {
six during 1981, 21 since January 1978. Our commitment to training on ,
these switches has been strong and continuous; therefore, we do not /,
believe this is the problem. )
Our attention was turned to the switch and the application to which it Il i
was being used. Attachment 1 plots the setpoint drift of 4 of these j switches for a period of 4 years. It is readily obvious these switches m are cyclic, being high in the warm months and low in the cold months. }l Attachments 2 and 3 provide the specifications for the Barksdale pj B2T-A12SS switch. The important characteristics f or PS-1-81, 91 are: $
Element type: Bourdon Tube
- j f
Proof Pressure: 1800 psig , ;
Rated Accuracy: tl% or 12 psig '
. I 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 perfonn e very reliably. However, the reason it does not becomes apparent when Attachment 4 is reviewed. The following conclusions can be drawn from Attachment 4:
- 1. For our application, a piston switch is better than a I diaphrage or bourdon tube. Our experience indicates.
{
the piston type Static-0-Ring to be a very reliable ^ _
r and accurate switch. -
t
- 2. Bourdon tube switches are extremely sensitive to prosess 5 surges. In our application, snubbers have been in-stalled to help alleviate this deficiency.
- 3. For greatest accurt_y, the setpoint should fall b the upper 65% oC the adjustable range. For the most f avorable life iactor the setpoint should be in the lower 65% of the adjustable range. For PS-1-81, 91:
Span = 1123 and setpoint (% Span) = 13.7%.
This places these swi:ches in the lower portion of Zone C, which is FAIR accuracy and EXCELLENT life.
Our experience proves this correct. Other switches we have drif t problems with are PS-68-93, 94. They have setpoints of 108 psig or setpoint (% span) is 9.6%. ,
In the final analysis, one can only conclude a misapplication of these 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 for DCR 1398 as it now is tied to 79-01B and environmental qualifications. In the interim we are investigating an improved switch and will keep you informed.
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!!;5TF.U::E ii DATA SHEET 'i 224A9300 -
1 DRESEURE S'.4ITCII SRC::!:S FERRY 1~2,3 - e., e $.m 95 i ,. 95 rnsi m.t t r::a L -l- St !- ',,
- ITE!' (TAG) ?!O 5-11A r.o 0 . l5-1? t r. 9 i Eia a b-91o l ~
4 4 l l .1 l fi $
- 00*flTITY /PLA:li e l lD"'.i en !T oore l ne: 1,
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- SERV!CE I cot:0 VAC'eti ,
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. ELEMEllT: DIAPHRAG!1 BOURDO:t TUBE ,- t.
TYPE DIAPHF.AGli ~ MAii.d! AL 55 Bil!!A ti l' lSS [,
. BODY MATEP.IAL ,
- I' -
C0;it;ECTOR SIZE , i ga npT :1 n. nor I n nor
< i SCALE RA;;GE/UillTS l ,
1-S!!AP ACTIO t , 5::AP ACT10:1 . 2-5:!AP ACTIC:: -- CD:lTACT: i TYPE /FOR!i SPDT 0 POT SPOT RAT!!iG - Ina a los i!sc lina n pen ife.c l f 10A a 120 VAC 'g )
- RE00 rat;GE ( ADJ) ! l0-5osio l I
- C0:! TACT #1 CPER AT l?3.3!!! HG '!AC DEd I1 M: m b '9- I' l.8"d 7 % I' C 9 f
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- CO ITACT d2 CFER AT lspaor l lco:gg l5cq- ' $
PURCHASE R :; E (*.0J11 2_?o ? p pr: l l .y_s m in
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F.ESET 5 A:t O!F~ l . .:_ , p i n pr; l ,1 e . 2 ; .
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- - 1 PP..us Frecs -. .S go .e 5 i . . n ., , 4 , l l i c nn .,4,.
- PP.CCE55 FLUID l l I l fg-
- DE5!G:1 TE::P l. .
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- CESIGi PRESS 1 4
- t;CE:'AL TE '? f I * !:00.:'*L PRESS 27-?9 i'! Uq l .65 .ee- aC4 . .' ! !
$20oEia lI a.0
- PCCD /CCURACY ! ! 0. 3 t Un Vr.C ,ei- .
I:ATED ACCU?*CY I 1% l I.1/2", l
! 15 F5 Pl.IEC'd 5E SPEC 12532013:001 fic'2r.513:6M' I :n sr. a ee:--a t
'/Ei;00R BARY.5 DALE l kiTATIC-0-P ::", ' _!!nA.gKjoALE l !a27-AljlS.s I FAT ';0 lOIT-H1355 h?!!3A.1 LC ATIO'i LOCAL !?5-57.6 l l LOCAL ,I l l I P',10 l 729E135 l729E13C I. l720E155 l -
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- YM DELAVAL TURBINE INC. e BARKSDALE CONTROLS Olvt5:CN
- 5125 Alcoa Aisnue L0s Angeles e Cant 90G5P. i, He.ued Saurdien Tube Models OPERATINGCHARACTERISTICS
- ORDERINGDATA nVater f gnt Howng (NEMA 4)
$c Ip'r"o'et r,$rnal Adiustment UNE EE ~ U
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Miust:ble Range Appron. ' Proof 81T 82T Actue Catalog Cate nce N,_ (Test) Decreasing 'acteasing yg g, ,, Number Number Ain. Mas. (Differentid) Matenal* , j.y .gg.g]q Pressure ( Min.l Man. D2T Hl2 {
#C ,Ygf, ,h 1800 to 1180 70 1200 toto 20 Broere 316 BIT.H12 BIT Al253 82T.Al253 1800 50 1173 77 1200 11 to 27
[,*p f. _ ,, J ;,3' ,.. - jf..% 4800 160 3170 190 3200 15 to 30 Dronze 81T H32 82T H32
+'1.l'M@lL 4 -N b Ir4
- d. 4000 7200 100 240 3161 199 3200 4715 325 4500 16 to 39 40 te 85 316 316 81T M12SS 81T.A4Rss 02T H3250 h 82T A47.S$ '
" 1750 325 6385 440 6500 54 to !!5 31 6 BIT A6553 R2T.A6535 I' die 31 6 81T.Al20$$ 02T Al20SS
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E " 18000 C00 11450 1150 12000 275 to 550
" 24000 603 17450 275 to S$0 316 DIT A18055l02T.AlaC55 4d.. 1150 l18000 _
**Stonte* represents Phosphor 8 tonne Tube with SAE 88 Brass Socket E2T OttAL CONTROL "216" represents 316 Stainless Steel fute & Socket 31T $1NCLC $EITING
"*APAINCO ' male opening for %* 00 tube connection. To change .A6553 and Al2355 switenes to %* not, add .P4 suths to model number. Perce adoitson required.
Approsimate shipping weight 2.5 Itrs. DET.t!L DATA ELECTR: CAL CHAllACitRISTICS: A16 models incorporate Underwriters' Laboratories. Inc. listed smie cole double throw snap actes switchms elements. Electncal rating (con. Imurms inductive) 10 amps 125 or 250 volts AC. 3 amos 480 volts AC. Automatically reset by sao action of seitch. For more details and other switch classes. ies pages 33 35. [LLCTRICAL CONNECTION: To scron termino 6s on covered terminal strip through %*nps conduit connector. g Circuit JI: Common- Purple P1tE!31JRE CONNECTION: %* N.P.T. internal threed. escept as noted". models with Normally Closed- Blue Proot Pressures above 8.000 P.S.I. have "AMINCO* le:nale opening for %* 0.D. tube Normally Open- lied connection. Circuit #2:Commen- Bro =9 Normally Closed-Oronte A0JUSTMENT INSTRUCTICMS Norma 61y Open - Yellow Turn adjustment screw c!ocanise to lower a:tuation point (switch setting). D2T BIT .
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MOW TO SELECT A PRESSU.T SWITCH FOR YOUR APPLICA -
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t Termmal block pressure switches are houeed and. en cel s
), SEftVICE LIFE OF THE SwtTCH tron. .*re equipped with enciosad terminal blocks, taic STEP 1 Espected sa rvice hfe is the first cons.deratecri to be made e'imir.ating His encense of buyine. and installing e.ste:tr.it [
in sciecting a pressure sw tttt regardless o: the pres.sure junction bones. or sensitivity des 6 red. If the servsce lite tihe number of Emplosion proof pressure switches are cesigned with Iear.* Cycles the switch is espected to o;:erate) is one shillio or housmgs buet to Conform to acceptad electncal standstis fess, use of either a bourdon tube or diaphrry,m smtch is in escialmg the smits from emplosive atmosphere. Att e s- ' andicated. If a service hfe of more than Gris enillion cycles plosion proof models are equipped with terminal hirwas j is desired. a piston switch should t,e used. Ari caception for convemence in wiring. to this rule may tse made when pressure chrent:e ett a sys-tem es very sin;nt (20%. or less, of the adtustable range). SELECTION OF AOJUSTA81.E RANCC Under such conditic.9 a bourdon tube or deaphragm STEP S smtett can be used up to 2.5 emilion cycles before metal The term " working range" dsfines the pressure rance a - smtch may see under nnernal wortung conditions. Iris :s I f a t Ct8". normaily the adlustable raege. A second consideration in chooseng a pressure swittft is I the speed of cycimg regardless of the servece hfe. II 4 For greatest accurney the set point should faU its the upper I swstch as espected to cycle more than once every three 65% of the adjustabte range. For the most favorable life
- t+conos. a piston type switch should be specified. The factor the set point should be in the lower 65% of tne t metal of any bourdors tube ot diaphragm acts as a spring adiustable rante. Therefora, the most favomble combera- ;
which will heat and fatigue in entremety fast Cycling tion of 30 curacy and life faClor lies in the medole 30% o' operations. thus shortening the life of the switch. the adjustable range (see disgrem). This general rui. applies both to diaphragm and bourdon tube pressure f The media to be controiled must always be considered r when selectsng a pressure switch and. to simplify selection
- smtches. i wettert materials for each type of swich are noted on ;
- t. see acct **c? & 8W1 uttet it'4 a . , , ,
apphcable catalog pages. 2 8cm tett Wttet IM c aw.as 20 l. STEP 2 PetOOF PRESSURES Choice of the type of pressure switch to be used - dia- -
,,,,,,,,v ,
=s = e J
[# pnragm, bourdon tube or pitton - also enust be goserned , l by the proof pressure to whict) it well be subsected. (Proof g* y ga '
- l pressure is ttie highest surge pressure that we6l ever be p esperienced in a system.) It must be rememtiered that, l.
although & pressure gauge may register a constant Oper* e/ abng pressure, there may be surges going througri re sys- .M / g.,, ;l ( tem that see dampened out by the orifice en the Cauete. $ ' U , l Diappragm end bourdon tube pressure switches are en- " g treme6y sensitive and wouid be affected by those surges. 5 M j Darlisd.ile diaphragm .witclies are available in an adlust- ;x 4 .
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able tante from vacuum to 150 psi mth proof pressures / C. ['
' y ,'*p(, l ' ,,l.
to 300 pse. flark sdale bourdon tube switeries are adiustable .
' ' a * -
to 18.000 pse with proof pressurns of 24 C03 osi. Barksdale piston switches have an adsustaible range tr,12.000 psi mth a proof pressure of 20.000 psi. acc. - unact Pood_r ei, veer cooo i escrucur ' ST!'P 3 FUNCTION OF THE SWITCH . y The tunttion ot the switch is another sictermemng (Jft9r t' , m mahmg .e selection. Thiee types of Uasksaaie pressurs . smtches. taaseet on function, ase itcscritmd below: HOW 10 READ CATALOG NilMBERS OF (1) Sinr:le setting pressure switches sense a sinr,te pres- DIAPHRACM surer source and open or cluse a sa.igle electrical cercu,1 by rneans of one snap action electrical switch. . BOURDON TUDE AND (2) Pressure difference switches sense a change in rela. tionship between two vanable contained pressures and OfA SEAT. P!STON open ct Ctose a single electncal circuit by m rans of one PRESSURE SWITCHES ! snap at. tion elei.trical switch. (3) Dual control pressure switches sense two pressere l lamals fount a ringle pressure source arid (Ten ur close two gyp, tat cuatec wasets t.a. t u p a r . ' r,,, e , : e ., p. ey., .,.. s . s,,,e i snetependent electrical ci.cuits by means of two soap action m e m se semw. .s.as seen..< J.De s cenere electrical smtches. t,w et owwe t.N,see. w.w.mmum.e neo 6
' r.m.enerwm % e4 en >=ae e+6
. . t .,,, w ,,a STEP 4 TYPES OF HOUSING AVAlt.ARLE ,
085818.I**'"" W' Strippret pressure smtches are basic BJrksdale pressure switch unik. mthout housant1. fl ey snay be u,cd wherevce
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*%f r:r.si e nciosures ara stready .wailable and are f avorerl ,g ter creapn.nl equipment enamatacturt es for rasat m sommtm _ g,q gg c.ilemet s roetusally, strapped smtches may be puschased , ,
g, ,,,,,,,,,,,,,,,,,,,, at a inws r cost,
- a.em r. n 8. essee a 4. s T *W e=wewas a e Xt o vs.,
Haused pressure switches Jre completely encfosad to wW' 'T * ' * .*e e.s.e e Ott ne c. .wt avoed possable hazard from Icuse wires in eaposed loca- , newsesse See e,ee ea d ease *v ti an s .
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