ML19341A644: Difference between revisions
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{{#Wiki_filter:. _ = ._ _ _ __ ._ _ | {{#Wiki_filter:. _ = ._ _ _ __ ._ _ | ||
U. S. NUCLEAA CS!ULAfoAV CoMMIS$40N seAC POM 36 Cm. ' | |||
l.lCENSEE EVENT REPORT comrAoteLoca.I ! l I l l l teksasa em Nr on tves ALL macusaso iNeo:Martszi l l Gl2.A l1vca(1%.11 (1 l@ls,carw@ | |||
l.lCENSEE EVENT REPORT comrAoteLoca.I ! l I l l l teksasa em Nr on tves ALL macusaso iNeo:Martszi | |||
l l Gl2.A l1vca(1%.11 (1 l@ls,carw@ | |||
r .. .a | r .. .a | ||
%. I P l uc. . A ul cca.8 l V l 5 l 1 [Ql 0weau.w-n. | %. I P l uc. . A ul cca.8 l V l 5 l 1 [Ql 0weau.w-n. | ||
.. . l 0 l- l 0 l o l 0 l 0 l o l- l0 l 0 m ccwr ITTTl g l1. @l 01510 l 010 l 313 ! ? d@l011 ava% | .. . l 0 l- l 0 l o l 0 l 0 l o l- l0 l 0 m ccwr ITTTl g l1. @l 01510 l 010 l 313 ! ? d@l011 ava% | ||
1017cars l 911 Gln | |||
: t. a I tan.ca l 'l 11 r carsA l Isol@ | : t. a I tan.ca l 'l 11 r carsA l Isol@ | ||
8 e .e .i accmar w ussa event oascairticN ANo paceasta constousNcts @ , | 8 e .e .i accmar w ussa event oascairticN ANo paceasta constousNcts @ , | ||
I Q l Wit _h the reactor shutdown, an operator wa4 perforntne a maninulation of' the seat | I Q l Wit _h the reactor shutdown, an operator wa4 perforntne a maninulation of' the seat 1105 hours when the meal flow dropped below the minimum on the i r.ama 11eak-off valves at the oniv RCP runnine. The numn was manually tripped, an l l G I IC Reactor Coolant Pump, I | ||
1105 hours when the meal flow dropped below the minimum on the i r.ama 11eak-off valves at the oniv RCP runnine. The numn was manually tripped, an l l G I IC Reactor Coolant Pump, I | |||
5 i req'uired. Itowever. Technical Specification 3.4.1'.1 requires at least one pump l | 5 i req'uired. Itowever. Technical Specification 3.4.1'.1 requires at least one pump l | ||
oe Lrunning. The pump was restarted within 20 minutes. There was a minimum of decav _ | oe Lrunning. The pump was restarted within 20 minutes. There was a minimum of decav _ | ||
I ITTTI I heat in the core and subcooled conditions were maintained. The health and safetv I | I ITTTI I heat in the core and subcooled conditions were maintained. The health and safetv I | ||
snu t of the public and site personnel was not jeopardized. so 8 s 4 Co pom4NrCoO4 se os su N' ITTTI I c i s l@ Ls.j@ (, Aj@ l Z l Z l Z l Z [ Z l Z l@ i Z@ . | |||
snu t of the public and site personnel was not jeopardized. so 8 s 4 Co pom4NrCoO4 se os su N' | |||
ITTTI I c i s l@ Ls.j@ (, Aj@ l Z l Z l Z l Z [ Z l Z l@ i Z@ . | |||
Z@ | Z@ | ||
. 50 In 12 IJ is aavisioN | . 50 In 12 IJ is aavisioN | ||
| Line 50: | Line 41: | ||
M T' ? cwa! of.'A'Er. '7.Mlll" s p lEJ @ lJLj@ LZJ@ | M T' ? cwa! of.'A'Er. '7.Mlll" s p lEJ @ lJLj@ LZJ@ | ||
a u l o f o f o@f .a L. o yJ@ f L.,.NJ O Iz n l@ Iz191919l@ | a u l o f o f o@f .a L. o yJ@ f L.,.NJ O Iz n l@ Iz191919l@ | ||
u n cAusa osscniericN ANo commscTive Actions @ | u n cAusa osscniericN ANo commscTive Actions @ | ||
g , ,o ; lThe cause of the unstable seal flow occurred during the valving attempt to transfer i The valving involved is sensitive enough to cause i g irhe RCP seal leak-off flow path. | g , ,o ; lThe cause of the unstable seal flow occurred during the valving attempt to transfer i The valving involved is sensitive enough to cause i g irhe RCP seal leak-off flow path. | ||
l g gthis instability. The plant engineering group is investigating a proposed l | l g gthis instability. The plant engineering group is investigating a proposed l | ||
g l Westinghouse solution to this problem. | g l Westinghouse solution to this problem. | ||
l l so ofwenstatus @ EsEoNav* oiscoveny oescaianom @ | |||
l l so | |||
ofwenstatus @ EsEoNav* oiscoveny oescaianom @ | |||
EY spowea i s [gj@ l0l0IOl@ln N/A | EY spowea i s [gj@ l0l0IOl@ln N/A | ||
= | = | ||
l [,,A,j@l Operator observation | l [,,A,j@l Operator observation | ||
= = = | = = = | ||
l | l ej,,,,,, g,,,, is toeano,.e...u.n@ | ||
ej,,,,,, g,,,, is toeano,.e...u.n@ | |||
u ouN/A ro,.cnvirv @ I I N/^ l | u ouN/A ro,.cnvirv @ I I N/^ l | ||
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: w. v .. enc.i.no,@ | : w. v .. enc.i.no,@ | ||
N/A l L' L'] 1010 I o !@lij@l " | N/A l L' L'] 1010 I o !@lij@l " | ||
' ' ' . .so.,s.'J. | ' ' ' . .so.,s.'J. | ||
won. 'i:nen ...n"o-@ N/A | won. 'i:nen ...n"o-@ N/A l | ||
i 4 1010101@l " | |||
' 'go ea,of' .g[o. ciurv g N/A l | ' 'go ea,of' .g[o. ciurv g N/A l | ||
@ L.,;;j@l | @ L.,;;j@l | ||
, . o | , . o | ||
* ' NAC USE CNLv , | * ' NAC USE CNLv , | ||
.u_ ,;''*:."s : .,-..: @ | .u_ ,;''*:."s : .,-..: @ | ||
N/A I ITTT1 LN 161 8 > to o I ! ' ' ! I ' ' ' ' ' ' ..I .;! | N/A I ITTT1 LN 161 8 > to o I ! ' ' ! I ' ' ' ' ' ' ..I .;! | ||
1 a | 1 a | ||
: v. s. Lacey ,,,cy ,; 412-643-3525 l u usc,,c.4as, i | : v. s. Lacey ,,,cy ,; 412-643-3525 l u usc,,c.4as, i | ||
l | l l | ||
l | |||
~ | ~ | ||
Attachment To LER 81-002/0tT Beaver Valley Power Station Duquesne Light Company Docket No. 50-334 4 | Attachment To LER 81-002/0tT Beaver Valley Power Station Duquesne Light Company Docket No. 50-334 4 | ||
\ | \ | ||
Because of a change made to the Reactor Coolant System (RCS) pressure requirements due to the overpressurization protection system, seal leak-off f rom the Reactor Coolant Pumps (RCPs) must be discharged to the Primary Drains Tank to provide less back-pressure on the No. .1 RCP seal than the Volume Control Tank (VCT) . When it becomes necessary to return the seal leak-of f flow to the normal system arrangement, the flow is directed to the VCT. The valving involved in this transfer can cause the flow to become unstable. If the flow is less than .2 gpm during the transfer, the operator must trip the RCP to protect the pump seal. Once the RCS pressure is increased to normal system pressure, the seal leak-off flow is stable and no further problems are encountered. | Because of a change made to the Reactor Coolant System (RCS) pressure requirements due to the overpressurization protection system, seal leak-off f rom the Reactor Coolant Pumps (RCPs) must be discharged to the Primary Drains Tank to provide less back-pressure on the No. .1 RCP seal than the Volume Control Tank (VCT) . When it becomes necessary to return the seal leak-of f flow to the normal system arrangement, the flow is directed to the VCT. The valving involved in this transfer can cause the flow to become unstable. If the flow is less than .2 gpm during the transfer, the operator must trip the RCP to protect the pump seal. Once the RCS pressure is increased to normal system pressure, the seal leak-off flow is stable and no further problems are encountered. | ||
Westinghouse has proposed a partial solution to this problem. They have suggested a finer flow measurement system which would help alleviate the control problem. This finer indication, along with throttle valves that are more suitable for very low flows, will elta'inate valving and control problems. | Westinghouse has proposed a partial solution to this problem. They have suggested a finer flow measurement system which would help alleviate the control problem. This finer indication, along with throttle valves that are more suitable for very low flows, will elta'inate valving and control problems. | ||
The Onsite Engineering Group is evaluating this problem. | The Onsite Engineering Group is evaluating this problem. | ||
e}} | e}} | ||
Latest revision as of 09:53, 31 January 2020
| ML19341A644 | |
| Person / Time | |
|---|---|
| Site: | Beaver Valley |
| Issue date: | 01/21/1981 |
| From: | Lacey W DUQUESNE LIGHT CO. |
| To: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| Shared Package | |
| ML19341A642 | List: |
| References | |
| LER-81-002-01T, LER-81-2-1T, NUDOCS 8101270593 | |
| Download: ML19341A644 (2) | |
Text
. _ = ._ _ _ __ ._ _
U. S. NUCLEAA CS!ULAfoAV CoMMIS$40N seAC POM 36 Cm. '
l.lCENSEE EVENT REPORT comrAoteLoca.I ! l I l l l teksasa em Nr on tves ALL macusaso iNeo:Martszi l l Gl2.A l1vca(1%.11 (1 l@ls,carw@
r .. .a
%. I P l uc. . A ul cca.8 l V l 5 l 1 [Ql 0weau.w-n.
.. . l 0 l- l 0 l o l 0 l 0 l o l- l0 l 0 m ccwr ITTTl g l1. @l 01510 l 010 l 313 ! ? d@l011 ava%
1017cars l 911 Gln
- t. a I tan.ca l 'l 11 r carsA l Isol@
8 e .e .i accmar w ussa event oascairticN ANo paceasta constousNcts @ ,
I Q l Wit _h the reactor shutdown, an operator wa4 perforntne a maninulation of' the seat 1105 hours0.0128 days <br />0.307 hours <br />0.00183 weeks <br />4.204525e-4 months <br /> when the meal flow dropped below the minimum on the i r.ama 11eak-off valves at the oniv RCP runnine. The numn was manually tripped, an l l G I IC Reactor Coolant Pump, I
5 i req'uired. Itowever. Technical Specification 3.4.1'.1 requires at least one pump l
oe Lrunning. The pump was restarted within 20 minutes. There was a minimum of decav _
I ITTTI I heat in the core and subcooled conditions were maintained. The health and safetv I
snu t of the public and site personnel was not jeopardized. so 8 s 4 Co pom4NrCoO4 se os su N' ITTTI I c i s l@ Ls.j@ (, Aj@ l Z l Z l Z l Z [ Z l Z l@ i Z@ .
Z@
. 50 In 12 IJ is aavisioN
) . occunaan.cs n.eont saousan.ai.
a4Pomrp o. CooE rYPE No.
Lgpino EVE'fVtA# o
@ ,aty,g 1811 l L--I IoIol21 kJ l 01 1i T l2 -J
,y
_u n a u 2. u a a 2 2 oas ^?.'W47 oT.lid.. 'Tu"/,817 of4l'l72"#.'..
M T' ? cwa! of.'A'Er. '7.Mlll" s p lEJ @ lJLj@ LZJ@
a u l o f o f o@f .a L. o yJ@ f L.,.NJ O Iz n l@ Iz191919l@
u n cAusa osscniericN ANo commscTive Actions @
g , ,o ; lThe cause of the unstable seal flow occurred during the valving attempt to transfer i The valving involved is sensitive enough to cause i g irhe RCP seal leak-off flow path.
l g gthis instability. The plant engineering group is investigating a proposed l
g l Westinghouse solution to this problem.
l l so ofwenstatus @ EsEoNav* oiscoveny oescaianom @
EY spowea i s [gj@ l0l0IOl@ln N/A
=
l [,,A,j@l Operator observation
=
l ej,,,,,, g,,,, is toeano,.e...u.n@
u ouN/A ro,.cnvirv @ I I N/^ l
'
- L;;J l
' ' ' .@o,..uiu.so '.1.@as 1.JJ " * "
- w. v .. enc.i.no,@
N/A l L' L'] 1010 I o !@lij@l "
' ' ' . .so.,s.'J.
won. 'i:nen ...n"o-@ N/A l
i 4 1010101@l "
' 'go ea,of' .g[o. ciurv g N/A l
@ L.,;;j@l
, . o
- ' NAC USE CNLv ,
.u_ ,;*:."s : .,-..: @
N/A I ITTT1 LN 161 8 > to o I ! ' ' ! I ' ' ' ' ' ' ..I .;!
1 a
- v. s. Lacey ,,,cy ,; 412-643-3525 l u usc,,c.4as, i
l l
~
Attachment To LER 81-002/0tT Beaver Valley Power Station Duquesne Light Company Docket No. 50-334 4
\
Because of a change made to the Reactor Coolant System (RCS) pressure requirements due to the overpressurization protection system, seal leak-off f rom the Reactor Coolant Pumps (RCPs) must be discharged to the Primary Drains Tank to provide less back-pressure on the No. .1 RCP seal than the Volume Control Tank (VCT) . When it becomes necessary to return the seal leak-of f flow to the normal system arrangement, the flow is directed to the VCT. The valving involved in this transfer can cause the flow to become unstable. If the flow is less than .2 gpm during the transfer, the operator must trip the RCP to protect the pump seal. Once the RCS pressure is increased to normal system pressure, the seal leak-off flow is stable and no further problems are encountered.
Westinghouse has proposed a partial solution to this problem. They have suggested a finer flow measurement system which would help alleviate the control problem. This finer indication, along with throttle valves that are more suitable for very low flows, will elta'inate valving and control problems.
The Onsite Engineering Group is evaluating this problem.
e