05000373/LER-1983-147, Updated LER 83-147/03X-1:on 831112,RHR B HX Outlet Valve 1E12-F003B Failed to Open Via Motor Operator or Manually. Caused by Water Trapped in Bonnet Cavity.Valve Limit Switches Temporarily changed.W/840320 Ltr: Difference between revisions
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~ '!.URDATEOL REmf -6 - - - ' - | |||
fREPOR,TSUBMITTED 12/12/83" LICENSEE EVENT REPORT | |||
' ' CONTROL SLOCX: l l l l l l h (Pt. EASE PRINT OR TYPE ALL REQUIRED itsPO'RS4AT1ENI g | |||
g , | |||
a l t l l l' { L l L l S l C l 1 g o l0 l- l ucanasmuussa 0 l0 l0 l0 l0 l- (0 l0a g=4 } ucmass 1 ; 0 ltree0 [ao0 gsi ca r sa f, to ae ucanssa caos i. . | |||
cont ott 0 | |||
sou l L l@l 0 l oocas?N de si 5101010131713 M sR EI4 Gs i@l1 11 11 121813l@l0 sVsNT oats 7. 75 AsPoRT oATE (2so l2!3181 EVENT DESCRIPTION AND PROSASLE CONSEQUENCE 3old Shutdown, the B RHR Heat Exchanger outlet , | |||
p 3 n.11-12-83 0 at 2215 with the unit in The inoperability l g ; valve (1E12-F003B) failed to open via the motor operator or manually. | |||
g g gof this valve, while in the closed position, made B Shutdown Cooling and B The A Shutdown Cooling Loop was operable to control decay , | |||
gPool Cooling inoperative. | |||
This second gheat. A second method of controlling decay heat was also available. | |||
g Safe operation of the plant was mainta!ned. g goerj gmethod utilizes the RHR and RCIC systems. | |||
1 MITU l c:n v iv. | |||
# ** systsu causs causs suecos susc=os c:ueemsurcces g :p g ecos caos susceos 1o181 l C ] F jg gg l A1: [g l VlIJ Al Ll Vl Ej X g ts sg 9 10 11 2 s ' | |||
e | |||
@ a g/Ao LaR 1VENTYEAA g i2,8I 31 L-J | |||
= | |||
8 R 11 14 17 i W | |||
2, IOI3I | |||
= = | |||
W 2. | |||
U m | |||
i iI | |||
= | |||
= .s.c,a, =e. | |||
u s G ^"usMis' ,oTJ's*u '"!T,*.ar- | |||
?"x.". TrYa! o!M'Eir 5'?a!lll" L2 | |||
= J@ | |||
Iz l@ lo lo lo Yi i U.. @ WO W@ I. A i 31911.,I@ | |||
'Lx.J@L.xJ@ | |||
= s | |||
= 2 the valve can ecome inoperable in the close position due to water 9 CAUSE DESCRIPTION AND CCRRECTIVE ACTICNS g llt is believed that Since the bonnet cavity does not have a mechanism j | |||
,being trapped in the bonnet cavity. | |||
to vent off the entrapped water for valve opening, the wedge is hydraulically locked in , | |||
, g the closed pcsition. At the recommendation of Anchor Darling Valve Mfg., the valvethe wed g l limittion switches were temporarily changed such thatThis change should allow during and not by torque. | |||
the entra i | |||
E 'Ivalve openina. | |||
'st seawan ofwenstAtus @ oEsmT osuuswanv osscan rion 22 g | |||
l , s WQ l 0l 0l0islgl NA l { g Observat. ion so as as as | |||
' 7 a4 g . is i.ccamose oc mes.aasa h messasso op astaAss amou= rop activ Tv @ l NA NA l l | |||
l '" | |||
l.5 l.s,) | |||
' W @ W @ EEss | |||
"* penso==sLsxpos '* | |||
wuusen Tves osscaimo= @ l M l0l0l0 "' | |||
] @l'* NA ,,,,,,n,,,,,. | |||
'' penso==s'L euu'Ess a i "*"'*N NA I-I' I' I ! OW"O b! | |||
I I 8404030253 840223 PDR ADOCK 05000373 so b op on oEactSo pActury n'3 PDR Tves ossenimon V S gTZe6 j | |||
, y l' s9Z l@l to NA | |||
[ | |||
NRc uss cNLY s0 | |||
; 7 ^ , | |||
NA [ j ., 9 g g g g g g g g g l 2 121 e l [@$s"semimo=Q t | |||
! es se so. : | |||
~ | |||
- r s 9 io | |||
" 815/357-6761 g PHONE: | |||
NAME OP emEP ARER | |||
,y, i. | |||
-l .: LER NUMBER: 83-14 7/03X-1 1 l' I . - LASALLE COUNTY. STATION: - Unit 1 111.- DOCKET-NUMBER: 050-373/374 . | |||
IV. : EVENT. DESCRIPTION: | |||
On 11-12-83 at 2215'with:the unit in Cold Shutdown, the B RHR Heat Exchanger outlet. valve (1E12-F0038) failed (to open via the motor operator or manually. | |||
-The Inoperability of this valve, while in the _ closed position, made B Shut-3 | |||
'down' Cooling and B Suppression Pool Cooling inoperative. | |||
V.n PROBA8LE: CONSEQUENCES-OF THE OCCURRENCE: - | |||
The A Shutdown Cooling Loop was operable to control decay heat. A second method ~of controlling decay-heat was also available - LLP-83-29 which utilizes the. RHR and RCIC systems. By 0300 on 11-13-83, the A RHR Shutdown Cooling Loop-was in operation. A high temperature of'185 F on the reactor water cleanup. system bottom head drain was reached prior to A RHR Shutdown | |||
' Cooling operation.- Safe operation.of the plant was' maintained. | |||
VI. CAUSE:- | |||
~ | |||
'1E12-F003B is a: flex-wedge gate valve manufactured by the Anchor Darling e ' Co .- Similar problems-with this valve have occurred previously. The correc-tive action in LER 83-117/03L-0 stated that the valve would be disassembled | |||
-1 at the next planned. unit outage of4suf ficient duration an'd the valve internals | |||
=inspacted Lfor any . potential . causes of inoperabili ty. A supplemental LER will ' | |||
-be issued-describing the" valve internals inspection. The 1E12-F003B valve was' disassembled via workLrequest L27760. The valve internals were inspected | |||
.by. representatives of-Anchor Darling Co., Mark Controls Corp.,-and Ceco. The | |||
' internals were evaluated as' extremely good. A wedge to seat rings contact | |||
~ test (Blue -Test) Indicated approximately 100% contact. While performing | |||
' Work Requesti . L29638, written to remove and ~ replace- the motor operator for the valve Internals 1 Inspection. the operator motor winding insulation was j: .foundL to be burnt. The valve was reassembled,! motor operator.-(with a new | |||
' ;- ~ motor) was replaced, and the valve satisfactorily cycled. The valve subse-Lquently again became locked in the1 closed position while continuing to test. | |||
ithe valve during various-conditions of B Shutdown Cooling, i t is believed | |||
^ | |||
_ that the valve 'can become Inoperable in ~ the close posi tion due to water being | |||
; trapped in the' bonnet cavity. - Since the' bonnet cavity does not'have a'mecha-inism- toient of.f the entrapped water for valve opening, the wedge is hydrauli-E ically; locked..in the closed position.- | |||
c | |||
.VII. " CORRECTIVE ~ ACTION: | |||
- At'the' recommendation of Anchor Darling, the valve limit switches were tempo-rarily: changed;such that the wedge travel'is stopped by position and not by | |||
- -torque. : This change would allow the water entrapped in the bonnet cavity to | |||
; ;be; vented'through the' upper seat rings to wedge seat as the valve is opened. | |||
A'temporaryLsystem! change' LAP 240-6 Att.'B 1-700-83 and work request L29978 L | |||
' Ewere performed to accomplish the above recommendation. The valve has since L- | |||
~ | |||
r w- -+ y9 m v-, ,--y, ,n-,-, ,.n, ,,n,,,, -m,. ny_-w.,,,-ew- ,.w,,,,-,n, we-en.-,,.,-. -mn,w , m ,4 ww,.- m.--~w-~nnm,-,w | |||
$3 J' Pcge it ' LER NUMBER: 83-147/03X-1 Vll. CORRECTIVE ACTION (Cont'd): | |||
been tested without failure several times under different conditions of B RHR Shutdown Cooling. A.I.R. 01-83-67128 has been issued to scrutinize the performance of_1E12-F003B over the next two excursions of the unit to cold shutdown. . If.the temporary system change to the valve resolves the valve becoming inoperative in the close position, a permanent modification will be made in accordance with Anchor Darling's recommendations. | |||
- Prepared by: M. A. Peters l | |||
e 4 | |||
r u- | |||
[D, Commonwe:lth Edison - O | |||
' / LaSalle County Nuclear Station O | |||
Rural Route #1, Box 220 | |||
( V 7 Marseilles, Illinois 61341 | |||
\ Telephone 815/357-6761 March 20, 1984 James G. Keppler Regional Administrator Region 111 U.S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, IL 60137 | |||
==Dear Si r:== | |||
Reportable Occurrence Report #83-147/03X-1 Docket #050-373 is being submitted to your office to supersede previously submitted Reportable Occurrence Report | |||
#83-147/03L-0, in accordance with NUREG-0161, " Instructions for Preparation of Data Entry Sheets for Licensee Event Report (LER) File"; General instruction No. 3 G. J. Diede ich Superintendent LaSalle County Station GJD/GW/kg Enclosure CC: Director of Inspection & Enforcement Director of Management information & Program Control | |||
- U.S. 'NRC Document Management Branch INP0-Records Center File /NRC ykR 2 O W e 74.72 'll | |||
}} | }} | ||
{{LER-Nav}} | {{LER-Nav}} |
Latest revision as of 00:49, 14 April 2020
ML20087N237 | |
Person / Time | |
---|---|
Site: | LaSalle ![]() |
Issue date: | 02/23/1984 |
From: | Diederich G, Peters M COMMONWEALTH EDISON CO. |
To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
References | |
LER-83-147-03X, LER-83-147-3X, NUDOCS 8404030253 | |
Download: ML20087N237 (4) | |
Event date: | |
---|---|
Report date: | |
3732083147R00 - NRC Website | |
text
" ____
~ '!.URDATEOL REmf -6 - - - ' -
fREPOR,TSUBMITTED 12/12/83" LICENSEE EVENT REPORT
' ' CONTROL SLOCX: l l l l l l h (Pt. EASE PRINT OR TYPE ALL REQUIRED itsPO'RS4AT1ENI g
g ,
a l t l l l' { L l L l S l C l 1 g o l0 l- l ucanasmuussa 0 l0 l0 l0 l0 l- (0 l0a g=4 } ucmass 1 ; 0 ltree0 [ao0 gsi ca r sa f, to ae ucanssa caos i. .
cont ott 0
sou l L l@l 0 l oocas?N de si 5101010131713 M sR EI4 Gs i@l1 11 11 121813l@l0 sVsNT oats 7. 75 AsPoRT oATE (2so l2!3181 EVENT DESCRIPTION AND PROSASLE CONSEQUENCE 3old Shutdown, the B RHR Heat Exchanger outlet ,
p 3 n.11-12-83 0 at 2215 with the unit in The inoperability l g ; valve (1E12-F003B) failed to open via the motor operator or manually.
g g gof this valve, while in the closed position, made B Shutdown Cooling and B The A Shutdown Cooling Loop was operable to control decay ,
gPool Cooling inoperative.
This second gheat. A second method of controlling decay heat was also available.
g Safe operation of the plant was mainta!ned. g goerj gmethod utilizes the RHR and RCIC systems.
1 MITU l c:n v iv.
- ** systsu causs causs suecos susc=os c:ueemsurcces g :p g ecos caos susceos 1o181 l C ] F jg gg l A1: [g l VlIJ Al Ll Vl Ej X g ts sg 9 10 11 2 s '
e
@ a g/Ao LaR 1VENTYEAA g i2,8I 31 L-J
=
8 R 11 14 17 i W
2, IOI3I
W 2.
U m
i iI
=
= .s.c,a, =e.
u s G ^"usMis' ,oTJ's*u '"!T,*.ar-
?"x.". TrYa! o!M'Eir 5'?a!lll" L2
= J@
Iz l@ lo lo lo Yi i U.. @ WO W@ I. A i 31911.,I@
'Lx.J@L.xJ@
= s
= 2 the valve can ecome inoperable in the close position due to water 9 CAUSE DESCRIPTION AND CCRRECTIVE ACTICNS g llt is believed that Since the bonnet cavity does not have a mechanism j
,being trapped in the bonnet cavity.
to vent off the entrapped water for valve opening, the wedge is hydraulically locked in ,
, g the closed pcsition. At the recommendation of Anchor Darling Valve Mfg., the valvethe wed g l limittion switches were temporarily changed such thatThis change should allow during and not by torque.
the entra i
E 'Ivalve openina.
'st seawan ofwenstAtus @ oEsmT osuuswanv osscan rion 22 g
l , s WQ l 0l 0l0islgl NA l { g Observat. ion so as as as
' 7 a4 g . is i.ccamose oc mes.aasa h messasso op astaAss amou= rop activ Tv @ l NA NA l l
l '"
l.5 l.s,)
' W @ W @ EEss
"* penso==sLsxpos '*
wuusen Tves osscaimo= @ l M l0l0l0 "'
] @l'* NA ,,,,,,n,,,,,.
penso==s'L euu'Ess a i "*"'*N NA I-I' I' I ! OW"O b!
I I 8404030253 840223 PDR ADOCK 05000373 so b op on oEactSo pActury n'3 PDR Tves ossenimon V S gTZe6 j
, y l' s9Z l@l to NA
[
NRc uss cNLY s0
- 7 ^ ,
NA [ j ., 9 g g g g g g g g g l 2 121 e l [@$s"semimo=Q t
! es se so. :
~
- r s 9 io
" 815/357-6761 g PHONE:
NAME OP emEP ARER
,y, i.
-l .: LER NUMBER: 83-14 7/03X-1 1 l' I . - LASALLE COUNTY. STATION: - Unit 1 111.- DOCKET-NUMBER: 050-373/374 .
IV. : EVENT. DESCRIPTION:
On 11-12-83 at 2215'with:the unit in Cold Shutdown, the B RHR Heat Exchanger outlet. valve (1E12-F0038) failed (to open via the motor operator or manually.
-The Inoperability of this valve, while in the _ closed position, made B Shut-3
'down' Cooling and B Suppression Pool Cooling inoperative.
V.n PROBA8LE: CONSEQUENCES-OF THE OCCURRENCE: -
The A Shutdown Cooling Loop was operable to control decay heat. A second method ~of controlling decay-heat was also available - LLP-83-29 which utilizes the. RHR and RCIC systems. By 0300 on 11-13-83, the A RHR Shutdown Cooling Loop-was in operation. A high temperature of'185 F on the reactor water cleanup. system bottom head drain was reached prior to A RHR Shutdown
' Cooling operation.- Safe operation.of the plant was' maintained.
VI. CAUSE:-
~
'1E12-F003B is a: flex-wedge gate valve manufactured by the Anchor Darling e ' Co .- Similar problems-with this valve have occurred previously. The correc-tive action in LER 83-117/03L-0 stated that the valve would be disassembled
-1 at the next planned. unit outage of4suf ficient duration an'd the valve internals
=inspacted Lfor any . potential . causes of inoperabili ty. A supplemental LER will '
-be issued-describing the" valve internals inspection. The 1E12-F003B valve was' disassembled via workLrequest L27760. The valve internals were inspected
.by. representatives of-Anchor Darling Co., Mark Controls Corp.,-and Ceco. The
' internals were evaluated as' extremely good. A wedge to seat rings contact
~ test (Blue -Test) Indicated approximately 100% contact. While performing
' Work Requesti . L29638, written to remove and ~ replace- the motor operator for the valve Internals 1 Inspection. the operator motor winding insulation was j: .foundL to be burnt. The valve was reassembled,! motor operator.-(with a new
' ;- ~ motor) was replaced, and the valve satisfactorily cycled. The valve subse-Lquently again became locked in the1 closed position while continuing to test.
ithe valve during various-conditions of B Shutdown Cooling, i t is believed
^
_ that the valve 'can become Inoperable in ~ the close posi tion due to water being
- trapped in the' bonnet cavity. - Since the' bonnet cavity does not'have a'mecha-inism- toient of.f the entrapped water for valve opening, the wedge is hydrauli-E ically; locked..in the closed position.-
c
.VII. " CORRECTIVE ~ ACTION:
- At'the' recommendation of Anchor Darling, the valve limit switches were tempo-rarily: changed;such that the wedge travel'is stopped by position and not by
- -torque. : This change would allow the water entrapped in the bonnet cavity to
- ;be; vented'through the' upper seat rings to wedge seat as the valve is opened.
A'temporaryLsystem! change' LAP 240-6 Att.'B 1-700-83 and work request L29978 L
' Ewere performed to accomplish the above recommendation. The valve has since L-
~
r w- -+ y9 m v-, ,--y, ,n-,-, ,.n, ,,n,,,, -m,. ny_-w.,,,-ew- ,.w,,,,-,n, we-en.-,,.,-. -mn,w , m ,4 ww,.- m.--~w-~nnm,-,w
$3 J' Pcge it ' LER NUMBER: 83-147/03X-1 Vll. CORRECTIVE ACTION (Cont'd):
been tested without failure several times under different conditions of B RHR Shutdown Cooling. A.I.R. 01-83-67128 has been issued to scrutinize the performance of_1E12-F003B over the next two excursions of the unit to cold shutdown. . If.the temporary system change to the valve resolves the valve becoming inoperative in the close position, a permanent modification will be made in accordance with Anchor Darling's recommendations.
- Prepared by: M. A. Peters l
e 4
r u-
[D, Commonwe:lth Edison - O
' / LaSalle County Nuclear Station O
Rural Route #1, Box 220
( V 7 Marseilles, Illinois 61341
\ Telephone 815/357-6761 March 20, 1984 James G. Keppler Regional Administrator Region 111 U.S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, IL 60137
Dear Si r:
Reportable Occurrence Report #83-147/03X-1 Docket #050-373 is being submitted to your office to supersede previously submitted Reportable Occurrence Report
- 83-147/03L-0, in accordance with NUREG-0161, " Instructions for Preparation of Data Entry Sheets for Licensee Event Report (LER) File"; General instruction No. 3 G. J. Diede ich Superintendent LaSalle County Station GJD/GW/kg Enclosure CC: Director of Inspection & Enforcement Director of Management information & Program Control
- U.S. 'NRC Document Management Branch INP0-Records Center File /NRC ykR 2 O W e 74.72 'll