ML19332D311: Difference between revisions
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{{#Wiki_filter:f sx*, | {{#Wiki_filter:f sx*, | ||
Neon EDISDN PLAZA r 300 MADISON AVENUE November 27, 1989 tottoo, GHto 436520301 j Log No.: BB89-01255 - | Neon EDISDN PLAZA r 300 MADISON AVENUE November 27, 1989 tottoo, GHto 436520301 j Log No.: BB89-01255 - | ||
NP33-89-017 j | NP33-89-017 j Docket No. 50-346 , | ||
License No. NPF-3 t | |||
Docket No. 50-346 , | United States Nuclear Regulatory Commission l Document Control Desk Vashington, D. C. 20555 Gentlement LER 89-015 l Davis-Besse Nuclear Power Station, Unit No. 1 : | ||
License No. NPF-3 | |||
Date of Occurrence - September 24, 1989 + | Date of Occurrence - September 24, 1989 + | ||
Enclosed Licensee Event Report 89-015 which is being provided in accordance with 10CTR50.73(a)(2)(i) to provide written notification of the subject occurrence. , | Enclosed Licensee Event Report 89-015 which is being provided in accordance with 10CTR50.73(a)(2)(i) to provide written notification of the subject occurrence. , | ||
Yours truly, | Yours truly, | ||
-M( | -M( | ||
Louis F. Storz | Louis F. Storz Plant Manager , | ||
Plant Manager , | |||
Davis-Besse Nuclear Power Station l LFS/p1f Enclosure cci Mr. A. Bert Davis Regional Administrator ^ | Davis-Besse Nuclear Power Station l LFS/p1f Enclosure cci Mr. A. Bert Davis Regional Administrator ^ | ||
USNRC Region III Mr. Paul Byron ; | USNRC Region III Mr. Paul Byron ; | ||
DB-1 NRC Sr. Resident Inspector hbk NC ' [[6 %AA | DB-1 NRC Sr. Resident Inspector hbk NC ' [[6 %AA p | ||
p | |||
1811C p.nm apt , 4.6. wucLSAR htsubAfony comuneseow I APPhovto one too 31to otte | 1811C p.nm apt , 4.6. wucLSAR htsubAfony comuneseow I APPhovto one too 31to otte | ||
~ | ~ | ||
UCENSEE EVENT CEPORT (LER) | UCENSEE EVENT CEPORT (LER) | ||
* PActLify IsAa88 til oocetti MutAD4h tal PAE.E us 1 Davis-Besse Unit No. 1 0 l5lojolel3:4l 6 1 loFl 0 l3 f tTLE e4) | * PActLify IsAa88 til oocetti MutAD4h tal PAE.E us 1 Davis-Besse Unit No. 1 0 l5lojolel3:4l 6 1 loFl 0 l3 f tTLE e4) | ||
Reactor Coolant System Flow Transmitter Erroneously Declared Operable evowv u te m Lan wumun a neont ute m erwin , AciLmes wvolvio mi j mowin oAv vaAn vsAn ''UM;;;" '*g | Reactor Coolant System Flow Transmitter Erroneously Declared Operable evowv u te m Lan wumun a neont ute m erwin , AciLmes wvolvio mi j mowin oAv vaAn vsAn ''UM;;;" '*g | ||
,, uowin oAv vtAn '^ci ut v a^=* D0ckst avustam ) | ,, uowin oAv vtAn '^ci ut v a^=* D0ckst avustam ) | ||
015l0lol0l 1 l 1 i | 015l0lol0l 1 l 1 i | ||
0l9 2l 4 8 9 8l9 0l1l5 0l0 1l1 2l 7 8 ]9 ol5loiolol l l l vae as one = ouememo rumeuAm to sas niou.a m wve w is een s: icn , ., m w w nn . | |||
0l9 2l 4 8 9 8l9 0l1l5 0l0 1l1 2l 7 8 ]9 ol5loiolol l l l | |||
vae as one = ouememo rumeuAm to sas niou.a m wve w is een s: icn , ., m w w nn . | |||
; | ; | ||
Moot W M 400lbl 30.estiel 00.734.lWHed 73J1tl ; | Moot W M 400lbl 30.estiel 00.734.lWHed 73J1tl ; | ||
1 _ _ _ | 1 _ _ _ | ||
R N.454rH1HO M.hteHij 30J34.Hallel 73314el l | R N.454rH1HO M.hteHij 30J34.Hallel 73314el l n., 0 i2 i 3 inh.i | ||
n., 0 i2 i 3 inh.i | |||
.si. | .si. | ||
.J.i.H. _ or | .J.i.H. _ or | ||
_ g,yg ; | _ g,yg ; | ||
, >g . se.4ssa.inHai 1 seJai.H Ho _ | , >g . se.4ssa.inHai 1 seJai.H Ho _ | ||
se.t.iaHmHal assAs > | se.t.iaHmHal assAs > | ||
<,y< , | <,y< , | ||
,s l '< M.4084.H1HNI MJ34.H8Hal 08J34.HRHval#1 | ,s l '< M.4084.H1HNI MJ34.H8Hal 08J34.HRHval#1 | ||
Line 76: | Line 53: | ||
"^Xl$4 0 | "^Xl$4 0 | ||
"I'nd"^j}' '[ | "I'nd"^j}' '[ | ||
cAust systsu coueontwv "'ys,$6 "$',05^jj8 Ig') .{,)j:$gg; | cAust systsu coueontwv "'ys,$6 "$',05^jj8 Ig') .{,)j:$gg; | ||
. ,: sw l l l l l l l x^ ' | . ,: sw l l l l l l l x^ ' | ||
l l l l l l l N | l l l l l l l N | ||
, e e . .es s , | , e e . .es s , | ||
[". A E U | [". A E U i l l l l l l ve' aers l l 1 l l l l Suppleessaff AL htpoRT EMPSCTto t*ti MONTH oAv vlAR vas lif ree, comeke, tK9tCTt0 SUOncistloN DATti No l l l Aser Act m . e.n .a, m an , nei on October 26, 1989, while reviewing questions raised about activities , | ||
associated with the calibration of FTRC01A2, it was concluded that the transmitter was out of tolerance when RPS Channel 2 was returned to operable status on September 24, *,989. RPS Channel 2 was inoperable for about 38 hours , | |||
i l l l l l l ve' aers l l 1 l l l l Suppleessaff AL htpoRT EMPSCTto t*ti MONTH oAv vlAR vas lif ree, comeke, tK9tCTt0 SUOncistloN DATti No l l l Aser Act m . e.n .a, m an , nei on October 26, 1989, while reviewing questions raised about activities , | |||
associated with the calibration of FTRC01A2, it was concluded that the transmitter was out of tolerance when RPS Channel 2 was returned to operable | |||
status on September 24, *,989. RPS Channel 2 was inoperable for about 38 hours , | |||
without satisfying the action statement of Technical Specification 3.3.1.1. | without satisfying the action statement of Technical Specification 3.3.1.1. | ||
The most probable cause of the calibration problem was a leak-by in the instrument manifold that was incorrectly seen as a zero shift. Consequently, when the transmitter was valved back into the RCS flow process and the equalizing valve tightened, the transmitter output was erroneously high. | The most probable cause of the calibration problem was a leak-by in the instrument manifold that was incorrectly seen as a zero shift. Consequently, when the transmitter was valved back into the RCS flow process and the equalizing valve tightened, the transmitter output was erroneously high. | ||
I l | I l | ||
l' On October 3, 1989, the transmitter was recalibrated successfully. An- | l' On October 3, 1989, the transmitter was recalibrated successfully. An-engineering review of the process readings vas conducted and the channel restored to operable. Individuals involved have reviewed the incident and results for lessons learned. | ||
engineering review of the process readings vas conducted and the channel restored to operable. Individuals involved have reviewed the incident and results for lessons learned. | |||
1 1 | 1 1 | ||
i l | i l | ||
l l | l l | ||
t | t | ||
r | r WRC Doroh U S WUCLE03 Cl!ULitohv C0hteH0810es LICENSEE EVENT REPORT (LER) TEXT CONTINUATION waovto oue =o 3 iso-oio. | ||
WRC Doroh U S WUCLE03 Cl!ULitohv C0hteH0810es | |||
tr>ihtS. s/31'N f acetaff haast sie Dochti NUtISt h (3) Llh huuttR 46) PAGE tai | tr>ihtS. s/31'N f acetaff haast sie Dochti NUtISt h (3) Llh huuttR 46) PAGE tai | ||
"** " ht.W." . | "** " ht.W." . | ||
Line 118: | Line 74: | ||
Davis-Besse Unit No. 1 o ls lo jo lo l3 l 4l6 8 l9 - | Davis-Besse Unit No. 1 o ls lo jo lo l3 l 4l6 8 l9 - | ||
0l1l5 - | 0l1l5 - | ||
0l 0 0p or 0 l3 Tort a m . = hac =,.mem nn Description'of Occurrences | 0l 0 0p or 0 l3 Tort a m . = hac =,.mem nn Description'of Occurrences o | ||
While reviewing questions raised about activities associated with an earlier calibration of flow transmitter FTRC01A2, it was concluded that the I transmitter was in fact inoperable when declared operable on September 24, 1989, at 0502 hours. FTRC01A2 senses Reactor Coolant System (RCS-AB) Loop 2 Hot Leg flov and inputs to Reactor Protection System (RPS-JC) Channel 2. The calibration had been performed with the reactor at 25 percent power. On September 25, 1989, at 1412 hours, with the reactor at 100 percent full power, the flov transmitter was again declared inoperable and RPS Channel 2 vas placed in the tripped condition in accordance with the action statement.of Technical Specification 3.3.1.1. | |||
t on October 26, 1989, the review concluded that there was firm evidence that the transmitter had been inoperable for approximately 38 hours without the action statement of Technical Specification 3.3.1.1. being satisfied. This is reportable under 10CFR50.73(a)(2)(1)(B) as a condition prohibited by Technical Specifications. | t on October 26, 1989, the review concluded that there was firm evidence that the transmitter had been inoperable for approximately 38 hours without the action statement of Technical Specification 3.3.1.1. being satisfied. This is reportable under 10CFR50.73(a)(2)(1)(B) as a condition prohibited by Technical Specifications. | ||
l | l Apparent Cause of Occurrences | ||
! The cause of returning the transmitter to an operable status when it was actually inoperable was personnel error when evaluating the transmitter output data. | |||
Apparent Cause of Occurrences | |||
! The cause of returning the transmitter to an operable status when it was actually inoperable was personnel error when evaluating the transmitter output | |||
data. | |||
l On September 23, 1989, work vas initiated to replace FTRC01A2 which had drifted high and had been previously declared inoperable. A new transmitter was installed and calibrated using Plant Procedure DB-MI-03062, Channel Cal of l FTRC01A2. During this process, the transmitter was thought to be experiencing l a zero' shift. After completion of the string calibration, restoration was completed and the RCS flow input to RPS Channel 2 was evaluated as acceptable. | l On September 23, 1989, work vas initiated to replace FTRC01A2 which had drifted high and had been previously declared inoperable. A new transmitter was installed and calibrated using Plant Procedure DB-MI-03062, Channel Cal of l FTRC01A2. During this process, the transmitter was thought to be experiencing l a zero' shift. After completion of the string calibration, restoration was completed and the RCS flow input to RPS Channel 2 was evaluated as acceptable. | ||
The numbers were good for indicated flow vith the reactor at 100 percent power. However, this calibration and evaluation was done with the reactor at l 25 percent power, and the indicated flov input was actually too high for this power level. , | The numbers were good for indicated flow vith the reactor at 100 percent power. However, this calibration and evaluation was done with the reactor at l 25 percent power, and the indicated flov input was actually too high for this power level. , | ||
l It is now thought that the zero shift was probably a result of leak-by | l It is now thought that the zero shift was probably a result of leak-by | ||
; in the instruhlent valve manifold which existed during the calibration on September 23, 1989. During the restoration of the transmitter to the RCS flov, valves were repositioned and tightened, and this caused what was seen as the shift. | ; in the instruhlent valve manifold which existed during the calibration on September 23, 1989. During the restoration of the transmitter to the RCS flov, valves were repositioned and tightened, and this caused what was seen as the shift. | ||
Analysis of Occurrence Vith the transmitter indicating high, it would have taken RPS Channel 2 longer to sense en RCS flow reduction to the trip setpoint. Although technically | Analysis of Occurrence Vith the transmitter indicating high, it would have taken RPS Channel 2 longer to sense en RCS flow reduction to the trip setpoint. Although technically inoperable, it vould have provided some degree of protection. The other three l channels vere operable during this time and would have provided protection but | ||
inoperable, it vould have provided some degree of protection. The other three l channels vere operable during this time and would have provided protection but | |||
; with less redundancy. Therefore, there is little safety significance to this l finding. | ; with less redundancy. Therefore, there is little safety significance to this l finding. | ||
I?*,,' ** * "' .u s am ees+eu s6ii | I?*,,' ** * "' .u s am ees+eu s6ii | ||
l ens ana u. =vettu a:varoay co C 1 LICENSEE EVENT REPORT (LER) TEXT CONTINUATION ***aovio ove ao moaion , | |||
l | |||
ens ana u. =vettu a:varoay co C 1 | |||
LICENSEE EVENT REPORT (LER) TEXT CONTINUATION ***aovio ove ao moaion , | |||
.- unians awie i PeteLif t maast its pocatisepustatar g g , ,g,,,g , ,,, ,,,,g,, | .- unians awie i PeteLif t maast its pocatisepustatar g g , ,g,,,g , ,,, ,,,,g,, | ||
"** " t'a" l t'J.*J: , | "** " t'a" l t'J.*J: , | ||
l Davis-Besso Unit No. 1 0 l5 l0 l0 lo l3 l4 l 6 8l9 - | l Davis-Besso Unit No. 1 0 l5 l0 l0 lo l3 l4 l 6 8l9 - | ||
0l1 l 5 - | 0l1 l 5 - | ||
0l0 0l 3 0F 0 l3 mn e === === . - a .am mac e mma w im Corrective Action to Prevent Recurrences | 0l0 0l 3 0F 0 l3 mn e === === . - a .am mac e mma w im Corrective Action to Prevent Recurrences i | ||
on October 3, 1989, the transmitter was recalibrated successfully. An i engineering review of the process readings was conducted, and the channel was ! | |||
restored to operable. 1 Personnel who were involved with this event have reviewed the lessons learned. ; | restored to operable. 1 Personnel who were involved with this event have reviewed the lessons learned. ; | ||
Failure Datat . | Failure Datat . | ||
Although there have been previous flov transmitter failures, this is the first which has led to an LER since 1983. , | Although there have been previous flov transmitter failures, this is the first which has led to an LER since 1983. , | ||
REPORT NO.: NP33-89-017 PCAO NO.: 89-0517 ! | REPORT NO.: NP33-89-017 PCAO NO.: 89-0517 ! | ||
i r | i r | ||
4 m | 4 m |
Revision as of 16:06, 31 January 2020
ML19332D311 | |
Person / Time | |
---|---|
Site: | Davis Besse ![]() |
Issue date: | 11/27/1989 |
From: | Storz L, Stotz J TOLEDO EDISON CO. |
To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
References | |
LER-89-015, NP-33-89-017, NUDOCS 8911300343 | |
Download: ML19332D311 (4) | |
Text
{{#Wiki_filter:f sx*, Neon EDISDN PLAZA r 300 MADISON AVENUE November 27, 1989 tottoo, GHto 436520301 j Log No.: BB89-01255 - NP33-89-017 j Docket No. 50-346 , License No. NPF-3 t United States Nuclear Regulatory Commission l Document Control Desk Vashington, D. C. 20555 Gentlement LER 89-015 l Davis-Besse Nuclear Power Station, Unit No. 1 : Date of Occurrence - September 24, 1989 + Enclosed Licensee Event Report 89-015 which is being provided in accordance with 10CTR50.73(a)(2)(i) to provide written notification of the subject occurrence. , Yours truly,
-M(
Louis F. Storz Plant Manager , Davis-Besse Nuclear Power Station l LFS/p1f Enclosure cci Mr. A. Bert Davis Regional Administrator ^ USNRC Region III Mr. Paul Byron ; DB-1 NRC Sr. Resident Inspector hbk NC ' [[6 %AA p
1811C p.nm apt , 4.6. wucLSAR htsubAfony comuneseow I APPhovto one too 31to otte
~
UCENSEE EVENT CEPORT (LER)
- PActLify IsAa88 til oocetti MutAD4h tal PAE.E us 1 Davis-Besse Unit No. 1 0 l5lojolel3:4l 6 1 loFl 0 l3 f tTLE e4)
Reactor Coolant System Flow Transmitter Erroneously Declared Operable evowv u te m Lan wumun a neont ute m erwin , AciLmes wvolvio mi j mowin oAv vaAn vsAn UM;;;" '*g
,, uowin oAv vtAn '^ci ut v a^=* D0ckst avustam )
015l0lol0l 1 l 1 i 0l9 2l 4 8 9 8l9 0l1l5 0l0 1l1 2l 7 8 ]9 ol5loiolol l l l vae as one = ouememo rumeuAm to sas niou.a m wve w is een s: icn , ., m w w nn .
;
Moot W M 400lbl 30.estiel 00.734.lWHed 73J1tl ; 1 _ _ _ R N.454rH1HO M.hteHij 30J34.Hallel 73314el l n., 0 i2 i 3 inh.i
.si. .J.i.H. _ or
_ g,yg ;
, >g . se.4ssa.inHai 1 seJai.H Ho _
se.t.iaHmHal assAs >
<,y< , ,s l '< M.4084.H1HNI MJ34.H8Hal 08J34.HRHval#1 ' 'I M.egeleHittel 30JD4.lWHWI 80J34sHastal
- LIC8tdS$8 Co4 TACT PoA THW LtR nti NAME 70LEPMOh8 NvM98R AhtAcoot Jan C. Stotz. Engineer - Maintenance Planning 4 l 119 'M2IU @ l514l4 counters one una con aAcw conspoessar e Aitune ossenioso in vues siseont tisi l cAuse avstou courowawr y
"^Xl$4 0 "I'nd"^j}' '[
cAust systsu coueontwv "'ys,$6 "$',05^jj8 Ig') .{,)j:$gg;
. ,: sw l l l l l l l x^ '
l l l l l l l N
, e e . .es s ,
[". A E U i l l l l l l ve' aers l l 1 l l l l Suppleessaff AL htpoRT EMPSCTto t*ti MONTH oAv vlAR vas lif ree, comeke, tK9tCTt0 SUOncistloN DATti No l l l Aser Act m . e.n .a, m an , nei on October 26, 1989, while reviewing questions raised about activities , associated with the calibration of FTRC01A2, it was concluded that the transmitter was out of tolerance when RPS Channel 2 was returned to operable status on September 24, *,989. RPS Channel 2 was inoperable for about 38 hours , without satisfying the action statement of Technical Specification 3.3.1.1. The most probable cause of the calibration problem was a leak-by in the instrument manifold that was incorrectly seen as a zero shift. Consequently, when the transmitter was valved back into the RCS flow process and the equalizing valve tightened, the transmitter output was erroneously high. I l l' On October 3, 1989, the transmitter was recalibrated successfully. An-engineering review of the process readings vas conducted and the channel restored to operable. Individuals involved have reviewed the incident and results for lessons learned. 1 1 i l l l t
r WRC Doroh U S WUCLE03 Cl!ULitohv C0hteH0810es LICENSEE EVENT REPORT (LER) TEXT CONTINUATION waovto oue =o 3 iso-oio. tr>ihtS. s/31'N f acetaff haast sie Dochti NUtISt h (3) Llh huuttR 46) PAGE tai
"** " ht.W." . *W.#
Davis-Besse Unit No. 1 o ls lo jo lo l3 l 4l6 8 l9 - 0l1l5 - 0l 0 0p or 0 l3 Tort a m . = hac =,.mem nn Description'of Occurrences o While reviewing questions raised about activities associated with an earlier calibration of flow transmitter FTRC01A2, it was concluded that the I transmitter was in fact inoperable when declared operable on September 24, 1989, at 0502 hours. FTRC01A2 senses Reactor Coolant System (RCS-AB) Loop 2 Hot Leg flov and inputs to Reactor Protection System (RPS-JC) Channel 2. The calibration had been performed with the reactor at 25 percent power. On September 25, 1989, at 1412 hours, with the reactor at 100 percent full power, the flov transmitter was again declared inoperable and RPS Channel 2 vas placed in the tripped condition in accordance with the action statement.of Technical Specification 3.3.1.1. t on October 26, 1989, the review concluded that there was firm evidence that the transmitter had been inoperable for approximately 38 hours without the action statement of Technical Specification 3.3.1.1. being satisfied. This is reportable under 10CFR50.73(a)(2)(1)(B) as a condition prohibited by Technical Specifications. l Apparent Cause of Occurrences ! The cause of returning the transmitter to an operable status when it was actually inoperable was personnel error when evaluating the transmitter output data. l On September 23, 1989, work vas initiated to replace FTRC01A2 which had drifted high and had been previously declared inoperable. A new transmitter was installed and calibrated using Plant Procedure DB-MI-03062, Channel Cal of l FTRC01A2. During this process, the transmitter was thought to be experiencing l a zero' shift. After completion of the string calibration, restoration was completed and the RCS flow input to RPS Channel 2 was evaluated as acceptable. The numbers were good for indicated flow vith the reactor at 100 percent power. However, this calibration and evaluation was done with the reactor at l 25 percent power, and the indicated flov input was actually too high for this power level. , l It is now thought that the zero shift was probably a result of leak-by
- in the instruhlent valve manifold which existed during the calibration on September 23, 1989. During the restoration of the transmitter to the RCS flov, valves were repositioned and tightened, and this caused what was seen as the shift.
Analysis of Occurrence Vith the transmitter indicating high, it would have taken RPS Channel 2 longer to sense en RCS flow reduction to the trip setpoint. Although technically inoperable, it vould have provided some degree of protection. The other three l channels vere operable during this time and would have provided protection but
- with less redundancy. Therefore, there is little safety significance to this l finding.
I?*,,' ** * "' .u s am ees+eu s6ii
l ens ana u. =vettu a:varoay co C 1 LICENSEE EVENT REPORT (LER) TEXT CONTINUATION ***aovio ove ao moaion ,
.- unians awie i PeteLif t maast its pocatisepustatar g g , ,g,,,g , ,,, ,,,,g,, "** " t'a" l t'J.*J: ,
l Davis-Besso Unit No. 1 0 l5 l0 l0 lo l3 l4 l 6 8l9 - 0l1 l 5 - 0l0 0l 3 0F 0 l3 mn e === === . - a .am mac e mma w im Corrective Action to Prevent Recurrences i on October 3, 1989, the transmitter was recalibrated successfully. An i engineering review of the process readings was conducted, and the channel was ! restored to operable. 1 Personnel who were involved with this event have reviewed the lessons learned. ; Failure Datat . Although there have been previous flov transmitter failures, this is the first which has led to an LER since 1983. , REPORT NO.: NP33-89-017 PCAO NO.: 89-0517 ! i r 4 m l c
.",7,,""*"' . u . o o ... .....s..i . . - . . - _ _ _ _ _ _ _ _ _ _ _}}