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lg (PLEASE PRINT OR TYPE ALL REQUIREO fNFORMATION) 10 t 8 9 lllLlQlAlDj1j@l0l0l0l- 14 t$ | lg (PLEASE PRINT OR TYPE ALL REQUIREO fNFORMATION) 10 t 8 9 lllLlQlAlDj1j@l0l0l0l- 14 t$ | ||
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57 wA T 3d F LICENSEE COCE LICENSE NuMd ER .3 CON'T | 57 wA T 3d F LICENSEE COCE LICENSE NuMd ER .3 CON'T Io 1 5OuR$ I L !@l 0l 5 DOCKET l0 l0 NLYSE l0 l2A l5 l 4 l@l 630 J 5(VENT l 2 DATE l4 l 7 l9 l@l 0 l 6RiPORT l 1 lD5ATEl 7 l 930l@ | ||
Io 1 5OuR$ I L !@l 0l 5 DOCKET l0 l0 NLYSE l0 l2A l5 l 4 l@l 630 J 5(VENT l 2 DATE l4 l 7 l9 l@l 0 l 6RiPORT l 1 lD5ATEl 7 l 930l@ | |||
7 8 60 6: Gd 14 75 EVENT DESCRIPTION ANO PROBA8LE CONSEQUENCES h O 2 l While conducting the suppression chancer to drywell vacuum breaker monthly exercise l g , | 7 8 60 6: Gd 14 75 EVENT DESCRIPTION ANO PROBA8LE CONSEQUENCES h O 2 l While conducting the suppression chancer to drywell vacuum breaker monthly exercise l g , | ||
(QOS 1600-1), vacuum breaker 1-1601-32D failed to give a closed indication. Subsequently, g ; Technical Specification 3.7.A.4.b could not be met. The unit was in the process of g gg being shut down for a scheduled maintenance outage at the time. All other vacuum breakegs O 6 l Operated properly. g I OTTI I I O a i j 7 8 s 80 E ODE SUSC E COMPONENT CODE SLB DE SU E | (QOS 1600-1), vacuum breaker 1-1601-32D failed to give a closed indication. Subsequently, g ; Technical Specification 3.7.A.4.b could not be met. The unit was in the process of g gg being shut down for a scheduled maintenance outage at the time. All other vacuum breakegs O 6 l Operated properly. g I OTTI I I O a i j 7 8 s 80 E ODE SUSC E COMPONENT CODE SLB DE SU E | ||
Line 37: | Line 35: | ||
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[YJg 48-l Y lg 42 l43N l@ lA l5 l8 l547l@ | [YJg 48-l Y lg 42 l43N l@ lA l5 l8 l547l@ | ||
44 CAUSE DESCRIPTION ANO CORRECTIVE ACTIONS h i o l An inspection of the valve indicated that the valve stem was bindina. thus not allowino l ITTT 1 I the disk to fully shut. A defecrive bushing was replaced as well as the end Oackina | 44 CAUSE DESCRIPTION ANO CORRECTIVE ACTIONS h i o l An inspection of the valve indicated that the valve stem was bindina. thus not allowino l ITTT 1 I the disk to fully shut. A defecrive bushing was replaced as well as the end Oackina f | ||
f | |||
, 7 g on the valve stem. The vacuum breaker was satisfactorily tested. l mi I 1 4 l l 7 8 9 80 STA % POWER CTNER STATUS IS O RY DISCOVERY DESCRIPTION i s l Dl@ [0 l2 l6 l@l NA l B j@l Routine Test l A IVITY CO TENT AMOUNT OF ACTivtTY LOCATION OF RELEASE 1 6lRELEASE @D OF RELEASE NA lZlgl l l NA l 7 8 9 10 t1 44 45 60 PERSONNEL EXPOSURES NUMBER TYPE D ESCRIPTION NA iTTil I ol 010 '@l Z l@l l | , 7 g on the valve stem. The vacuum breaker was satisfactorily tested. l mi I 1 4 l l 7 8 9 80 STA % POWER CTNER STATUS IS O RY DISCOVERY DESCRIPTION i s l Dl@ [0 l2 l6 l@l NA l B j@l Routine Test l A IVITY CO TENT AMOUNT OF ACTivtTY LOCATION OF RELEASE 1 6lRELEASE @D OF RELEASE NA lZlgl l l NA l 7 8 9 10 t1 44 45 60 PERSONNEL EXPOSURES NUMBER TYPE D ESCRIPTION NA iTTil I ol 010 '@l Z l@l l | ||
*ERSONNEL INJURIES NuMeER OESCnlPTION i a 101Ol01@l NA qg7A p% | *ERSONNEL INJURIES NuMeER OESCnlPTION i a 101Ol01@l NA qg7A p% | ||
l 7 8 9 11 12 [ I al 7 80 LOSS OF OR DAVAGE TO FACILITY TYPE D E SCRIPTION i NA 7 | l 7 8 9 11 12 [ I al 7 80 LOSS OF OR DAVAGE TO FACILITY TYPE D E SCRIPTION i NA 7 | ||
9 8 9 lZl@l 10 a0 l | 9 8 9 lZl@l 10 a0 l | ||
PU8LtCITY NRC USE ONLY 4s e tSSUED D 7906270JoJ lllllll ll l; | PU8LtCITY NRC USE ONLY 4s e tSSUED D 7906270JoJ lllllll ll l; L2J 8o]9 I N lhl ESCRIPTION 7 | ||
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10 | 10 K.. Leech - - - - - - - | ||
K.. Leech - - - - - - - | |||
-- 309-654-2241 ext . 176 ? | -- 309-654-2241 ext . 176 ? | ||
NAurnfPAFPAAFA PHONE: - | NAurnfPAFPAAFA PHONE: - | ||
: l. LER NUMBER: LER/R0 79-19/03L-0 | : l. LER NUMBER: LER/R0 79-19/03L-0 | ||
: 11. LICENSEE NAME: Commonwealth Edison Company Quad-Cities Nuclear Power Station Ill. FACILITY NAME: Unit One IV. DOCKET NUMBER: 050-254 V. EVENT DESCRIPTIO!i: . | : 11. LICENSEE NAME: Commonwealth Edison Company Quad-Cities Nuclear Power Station Ill. FACILITY NAME: Unit One IV. DOCKET NUMBER: 050-254 V. EVENT DESCRIPTIO!i: . | ||
Line 65: | Line 54: | ||
Vill. CORRECTIVE ACTION: | Vill. CORRECTIVE ACTION: | ||
The defective bushing was replaced as well as the packing on that end of the valve stem. The vacuum breaker was then tested satisfectorily. | The defective bushing was replaced as well as the packing on that end of the valve stem. The vacuum breaker was then tested satisfectorily. | ||
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Latest revision as of 05:30, 22 February 2020
ML19269E314 | |
Person / Time | |
---|---|
Site: | Quad Cities |
Issue date: | 06/15/1979 |
From: | Leech K COMMONWEALTH EDISON CO. |
To: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
Shared Package | |
ML19269E312 | List: |
References | |
LER-79-019-03L-01, LER-79-19-3L-1, NUDOCS 7906270205 | |
Download: ML19269E314 (3) | |
Text
NRC FORM 366 U.S. NUCLEAR RECULATORY COMMISSION wm -
- LICENSEE EVENT REPCRT COi1 TROL BLOCA. '
1 l l l l 6
lg (PLEASE PRINT OR TYPE ALL REQUIREO fNFORMATION) 10 t 8 9 lllLlQlAlDj1j@l0l0l0l- 14 t$
l0 l 0 l 0 l - l 0 l0 l 0 l@l ./.l 1 lLICENSs 6 1 l 1TYPE l 1JJ l@[ l l@
57 wA T 3d F LICENSEE COCE LICENSE NuMd ER .3 CON'T Io 1 5OuR$ I L !@l 0l 5 DOCKET l0 l0 NLYSE l0 l2A l5 l 4 l@l 630 J 5(VENT l 2 DATE l4 l 7 l9 l@l 0 l 6RiPORT l 1 lD5ATEl 7 l 930l@
7 8 60 6: Gd 14 75 EVENT DESCRIPTION ANO PROBA8LE CONSEQUENCES h O 2 l While conducting the suppression chancer to drywell vacuum breaker monthly exercise l g ,
(QOS 1600-1), vacuum breaker 1-1601-32D failed to give a closed indication. Subsequently, g ; Technical Specification 3.7.A.4.b could not be met. The unit was in the process of g gg being shut down for a scheduled maintenance outage at the time. All other vacuum breakegs O 6 l Operated properly. g I OTTI I I O a i j 7 8 s 80 E ODE SUSC E COMPONENT CODE SLB DE SU E
[ 9] l S l A l@ y@ l B l@ lV lA lL [V lE lX l@ J @ W @
7 8 s 30 si 32 is is 39 20 SEQUENTIAL OCCURRENCE REPORT REVISION LER/RO EVENT YEA R REPORT NO. CODE TYPE NO.
h ,RE l 7l 9l
,21 22 g
23 l 0 l1 l9 l 24 26 l/l 27 l0l3l 2u 29 W
30
[_J 31 l0 l J2 N A O CN PL NT ME HOURS 22 SB 1 FOR B. SUPPLIE MAN FACTURER l0 g ]4g 33 3 35 Z
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44 CAUSE DESCRIPTION ANO CORRECTIVE ACTIONS h i o l An inspection of the valve indicated that the valve stem was bindina. thus not allowino l ITTT 1 I the disk to fully shut. A defecrive bushing was replaced as well as the end Oackina f
, 7 g on the valve stem. The vacuum breaker was satisfactorily tested. l mi I 1 4 l l 7 8 9 80 STA % POWER CTNER STATUS IS O RY DISCOVERY DESCRIPTION i s l Dl@ [0 l2 l6 l@l NA l B j@l Routine Test l A IVITY CO TENT AMOUNT OF ACTivtTY LOCATION OF RELEASE 1 6lRELEASE @D OF RELEASE NA lZlgl l l NA l 7 8 9 10 t1 44 45 60 PERSONNEL EXPOSURES NUMBER TYPE D ESCRIPTION NA iTTil I ol 010 '@l Z l@l l
- ERSONNEL INJURIES NuMeER OESCnlPTION i a 101Ol01@l NA qg7A p%
l 7 8 9 11 12 [ I al 7 80 LOSS OF OR DAVAGE TO FACILITY TYPE D E SCRIPTION i NA 7
9 8 9 lZl@l 10 a0 l
PU8LtCITY NRC USE ONLY 4s e tSSUED D 7906270JoJ lllllll ll l; L2J 8o]9 I N lhl ESCRIPTION 7
NA l 68 69 ll 50 * ;
10 K.. Leech - - - - - - -
-- 309-654-2241 ext . 176 ?
NAurnfPAFPAAFA PHONE: -
- l. LER NUMBER: LER/R0 79-19/03L-0
- 11. LICENSEE NAME: Commonwealth Edison Company Quad-Cities Nuclear Power Station Ill. FACILITY NAME: Unit One IV. DOCKET NUMBER: 050-254 V. EVENT DESCRIPTIO!i: .
On May 24, 1979, while conduc- 1g the suppression chamber to drywell vacuum breaker monthly exercise (Q0S 1600-1), vacuum breaker 1-1601-320 failed to give a closed indication. It coulc not be determined if the valve actually failed to close or if it just was a limit switch problem, because of the inaccessibility of the vacuum breakers. Subsequently, Technical Specification 3.7. A.4.b could not be met. The Unit was in the process of being shut down for a scheduled maintenance outage. Work request 2868-79 was written to investigate the problem. An event of a similar nature was reported in RO 77-49/03L.
VI. PROBABLE CONSEQUENCES OF THE OCCURRENCE:
The suppression chamber to drywell vacuum breakers on Unit One had'all been successfully operated previously on April 26, 1979 During the exercise test performed on May 24, all other vacuum breakers operated properly; thus, the safety implications of this occurrence were minimal.
Vll. CAUSE:
An inspeccion of the v&lve indicated that the stem was binding, thereby not allowing the disk to fully shut. During disassembly, a rough spot was found on the bushing at one end of the valve stem.
Vill. CORRECTIVE ACTION:
The defective bushing was replaced as well as the packing on that end of the valve stem. The vacuum breaker was then tested satisfectorily.
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