05000259/LER-1981-038-03, /03L-0:on 810630,setpoints for Reactor Low Pressure Switches PS-3-74B,PS-68-95 & PS-68-96 Actuated Outside Allowable Limits.Caused by Setpoint Drift.Barton & Barksdale Model Switches Recalibr
| ML20009G490 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 07/28/1981 |
| From: | Holder G TENNESSEE VALLEY AUTHORITY |
| To: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| Shared Package | |
| ML20009G481 | List: |
| References | |
| LER-81-038-03L, LER-81-38-3L, NUDOCS 8108040340 | |
| Download: ML20009G490 (6) | |
| Event date: | |
|---|---|
| Report date: | |
| 2591981038R03 - NRC Website | |
text
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U.S. NUCLEAR REGULATORY COMMISSION nu: P onM.h.e,
~
LICENSEE EVENT REPORT CONIHOL OLOCL l l
l l
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l (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATIONI i
e i. y l Al I,l Bl Rl Fl 1lh! 0 l O!
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.i LlLENSE L Cont 14 15 LICENSE NUMBEH 26 26 LICENSE TYPE JO
$1 CAT $8 l)?V I
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"' [/,"c' l Ll@l 01 51 01 01 01 21 51 9 @l 01 6 l 3 l 01 81 1]@l 017 12 l 81 8l 1l@
eas 61 DOCK ET NUMBER 68 69 EVENT DATE 74 7S REPORT D ATE 80 F VI NI IMCHH' HON AND PnOB ABLE CONSEQUENCES h
[] - [ _ therir rel ue l ing outage, while performinn SI 4.2.B-7 setnoints for reactor low -
1 gg[ pressitre switches PS-3-74B, PS-68-95, and PS-68-96 were found to actuate outside of l
-[{ E LI,S. Tables 1.2.A and 3.2.B limits. The average out of tolerance was 2.92 percent.
l Q-l There was no danger to the health or safety of the public. Previous similar events: l Jgg [ IWR0 50-259/78016, 79008, 80058, 81029, 81032: 260/78002. 790t7. 79024, 80022, 80057,f
[-[~l [ M 1023; 296/79007, 79012, 79028. 80022, 80030, 80045, 80052, 81007.
I 1
L1LJ L.
- Y S i t M
CAUSE
CAUSE COMP.
VALVE r: ODE CODE SU8 CODE COMPONE NT CODb SUSCODE SUSCODE
- 1., i i i ci il@ LnJ@ 181@ 111x l S ir la lu l8 is l@ I zi@
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/1 23 24 26 27 28 29 30 31 J2 A8:llON FilitlHt EFFECT SHUTDOWN ATT ACHM E N T NPRO4 PRIME COMP.
COMPONENT f /4 T r; Af: TION ON PLANT METHOO HOURS SUBMITTED FORMbv8.
SUPPLIER MANUFACTURER l E Jgli+1F lg lhZl@
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ti 36 31 40 41 42 43 44 47 CAU:.E DE. quit lPTION AND CORRECTIVE ACTIONS h lilH Il %tpoint drift. The Barton Model 288 and Barksdale Model B2T-M12SS pressure switches I kLij l we're recalibrated to oroner setnoint and SI 4.2.B-7 successfully comnieted. DCR l
.Ii1 I l 1V)H replaces these switches with analog transmitters and trip units.
A study of I
IiI'l l minoint drift problems is attached, f
l
['IiI' 80 i
s ne u iy METHOD OF I ^ l e r, mmh OTHER ST ATUS Ol'iCOV F R Y DISCOVERY DESCRIPTION
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259 ' 81038 T* t ' a aL ;4' < *.:..ii '.. I n.." "d Tables. 3._2.. A and 3. 2.B l
P.. '. I !!nel.:r 6' i h:n SU"edic it ir.n 6.7.2.b.2 alia te due Niu:: 7/30/81 i m'e..f (Ircu r re 1. e 6/30/81 i hue s. f ( "" 'tre ern:"
0900 i.' n i!
, _ l,
- .l r.1iical h n and ! m..copt ion..f I h:curren. v Setpoints for reactor low-pressure switches PS 74B, PS-68-95, and PS-68-96 were l
found to actuate outside of T.S. tables 3.2.A and 3.2. B limits. The average i
out of tolerance was 2.92 percent.
t '.,:uiit ion. I'.rio.r. :. ()r s u r.r.e.nce.
Unit 1 in refueling outage.
f I
linit 2 at 997..
tinit 'I a t 91%.
t i ini fe linical :;pe. ificat ie.n.;u r' "i'.l.ne" lleyttirement: niel
- - l i..!:
.}... C ie. t tiv pri.il.!.
e.;i..puc.it.
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None S..t " :.i t'au:-
l' L -
n.-
}
Setpoint drif t.
I f
'?r 1 !g.9
'fr
,.t' There was no danger to the health or safety of the public, no release of activity, l
nn damar.e to the plant or equipment, and no resulting significant chain of events.
r i
I i
1 ?.. r.-ciire.\\ct inn.
I Switches wore recallbrated to proper setpoint and SI 4.2.B-7 successfully 1398 replaces these switches with analog transmitters and trip completed. DCR un i t s. A study of setpoint drift problems-is attached, i
BFR0 50-259/78016, 79008, 80058, 81029, 81032; 260/78002, 79017, i
l ailure Data:
79024,~80022, 80057, 81023; 296/79007, 79012, 79028, 80022, 80030, 80045, 80052, 81007.
l
!;c t en t ion :
l'e r y.d - ?.if. ur.. Ite.ponsibility - Dr.rument Control Supervisor ff L
m.. iv..n :
KITACllMENT to LER 11 FRO-50-259/810 38 Subi.et:
SETpo1NT i)RTFT - 1;ARKSDAl.E PRESSURF. S91TCllE9 Recent iv t here han been a number of LER.; en B.irksdale precsure switches:
..ix. luring 1981, 21 ;ince January 1978. n i c ommi ttren t to t raf uiun na u
switihes has been "tronr. anil. ont inueun ; theref ore, we do not r ho helter. th!. Is the problem.
i a t t e n t i..n.. in tuine.1 to the sui t c h an.' th".ipplication t o wh i c h it i as beinr used.
Attachuent 1 plots the s.c t po i n t. drift cf 4 of t he.4e swit ches f or a per ied of 4 years, it is readily obvious these switches a r.. eyelic, be ine hir.h in the warm months and low in the celd months.
A t t icimen t s.' cad 3 provide the specificat ions for the 13arksdale P. ' - A l '.5
- witch.
The Lnpor t ant character ist les f or PS-i-81, 91 are:
L l enen t type:
11ourdon Tube proof l'ressure:
1800 psig Hated Accuracy:
il2 or 12 psig psig - recently chanped from 160 psig Setpoint:
13 4
Adicatable Ran:'e:
77-1200 psig
!: sou h!.ippear haned on. st t.ic h:aen t i. 2 a.id 1 t. he swi t ch would perfo nn
.t-ieii ably llouc v e i t h.-
r.. r. o n it d oc.
n"t becomon apparent when
.' i hurni ; i:
icoi.
>r d.
the iollowine ioneinnion. ran ho d t..wn i rom
' a c i.. ic u t 4:
1.
For our ap;.1i cat ion, a p iston swit.ch is hett.cr than a diaphragm or bourdon tube.
Our experience indicates the pinton type Statis-O-Ring to he a very reliabic and accurat t switch.
2.
Beurden tub W it ches are extremelv sensitiste to pr.wess In our appl icat ion, annbbet s have been in-su r r,e s.
- talled to help alleviate t hi.-; def iciency.
For yr ate t acco:acy, Ihe set poin t shooid fall in the most th.. upper i.i ei the niin. t able ran e.
i' e r
. oi :.h !c lit.
1.
tor 'he scipoint rhould b.-
in the
+
For ps-1-Si, 41:
l ow. r n'o it 'he.id i nnt.ihl e i. n c, c.
Span = 1123 and Setpoint P "p:nO -
13.7*.
This p laecs these switches in the lower portion of Zone C, which I.s FAIR accu racy and F.XCthl.ENT life Our f.pe rience provan t h is correct.
Other switches we have drift problems with are pS-68-93, 94.
The'/ have set point s o ' 108 psig or setpoint (7 span) is 9.6*..
In the fir.al analysis, one can only conclude a misapplication of these witch.m, both in switch type and cf adjustable range.
We recognized this voars ano and DCR 1398 (12/7/77) was initiated.
EN DES does not have an imp lement at ion date f or DCR 1598 as it now la tied to 79-01B an.' environment al inial if ica t ions.
In the interim we are investinating Uipioved nuitet'
.d will keep you informed, an i
1 4
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