ML19305E836: Difference between revisions
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LICENSEE EVENT REPORT 8005200507 C) CcNTRcL stCCx: I ! I I I I g (PLEASE PRINT OR TYPE ALL REQUIREO INFORMATION) lo t i8 l 7l c I O 7 | LICENSEE EVENT REPORT 8005200507 C) CcNTRcL stCCx: I ! I I I I g (PLEASE PRINT OR TYPE ALL REQUIREO INFORMATION) lo t i8 l 7l c I O 7 | ||
I F l S I V l 1 15l@l 010 l- !LICENSE LICENSEE COCE 14 0 l0 lNuveta 01010 l- l010 25 l@l4 26 l1 Il !2Tvet LICENSE IOJ3l@l57 CAT l 64 l@ | I F l S I V l 1 15l@l 010 l- !LICENSE LICENSEE COCE 14 0 l0 lNuveta 01010 l- l010 25 l@l4 26 l1 Il !2Tvet LICENSE IOJ3l@l57 CAT l 64 l@ | ||
Cc.vT | Cc.vT l0I1I F 4 S [Md00l L l@l 0 l 5OCCK 6i l 010 l0 l 21617 ET NUVS E A 64 | ||
l0I1I F 4 S [Md00l L l@l 0 l 5OCCK 6i l 010 l0 l 21617 ET NUVS E A 64 | |||
@l 69 014 Il 18 l 810 l@l O! 5l EVENT DATE 74 75 11QATE AEPCAT 31 Sl Ol@ dG EVENT DESCRIPTION AND PROBA8LE CCNSEQUENCES h lo12l lDuring testing, it was discovered that two of twelve helium circulater seal malfunc- l lo!3l l tion pressure differential switch units tripped outside the limits of LCO 4.4.1, I laiAIITable 4.4-3. Reactor coeration durinz test interval. Recortable oer Technical Soeci-l l a i 3 ! t fication AC 7.5.2(b)1 and AC 7.3.2(b)2. No effect on public health or safety. Re- l la is l ldundant system available and operable. Similar reports are RO 77-47 Final. and Pre- l l c j 71 l liminary reports RO 78-2 7. RO 79-32. RO 79-56. R0 80-07, and R0 S0-16. I I | @l 69 014 Il 18 l 810 l@l O! 5l EVENT DATE 74 75 11QATE AEPCAT 31 Sl Ol@ dG EVENT DESCRIPTION AND PROBA8LE CCNSEQUENCES h lo12l lDuring testing, it was discovered that two of twelve helium circulater seal malfunc- l lo!3l l tion pressure differential switch units tripped outside the limits of LCO 4.4.1, I laiAIITable 4.4-3. Reactor coeration durinz test interval. Recortable oer Technical Soeci-l l a i 3 ! t fication AC 7.5.2(b)1 and AC 7.3.2(b)2. No effect on public health or safety. Re- l la is l ldundant system available and operable. Similar reports are RO 77-47 Final. and Pre- l l c j 71 l liminary reports RO 78-2 7. RO 79-32. RO 79-56. R0 80-07, and R0 S0-16. I I | ||
10!31 I 30 7 i SYSTEM CAUSE CAUSE C OVP. VALVE COCE CCCE SUECOCE COMPCNENT CODE SUBCOCE SUBCOCE 10191 7 3 9 l C l a l@ It l@ It l@ l 11 10 ii 12 f2 Ni s l Tl RI ul@ i8 l s l@ I z i@ | 10!31 I 30 7 i SYSTEM CAUSE CAUSE C OVP. VALVE COCE CCCE SUECOCE COMPCNENT CODE SUBCOCE SUBCOCE 10191 7 3 9 l C l a l@ It l@ It l@ l 11 10 ii 12 f2 Ni s l Tl RI ul@ i8 l s l@ I z i@ | ||
Line 32: | Line 30: | ||
i yl@ l42N I@ l43NI@ l4As i 01 a l Ol@ | i yl@ l42N I@ l43NI@ l4As i 01 a l Ol@ | ||
JJ J4 36 40 ei 47 CAUSE CESCRIPTICN AND CCRRECTIVE ACTICNS h lilal lITT Barton Model 239 pressure dif ferential switches failed to actuate at trio coint I til-l jdue to dirt accu =ulation in electrical switches. Affected switches re-adiusted to i | JJ J4 36 40 ei 47 CAUSE CESCRIPTICN AND CCRRECTIVE ACTICNS h lilal lITT Barton Model 239 pressure dif ferential switches failed to actuate at trio coint I til-l jdue to dirt accu =ulation in electrical switches. Affected switches re-adiusted to i | ||
;i,,j l proper trip points. Trip settings being checked on a =cnthly basis. Redis12n of I i,;,; ] system being evaluated. l li t a l ! I | ;i,,j l proper trip points. Trip settings being checked on a =cnthly basis. Redis12n of I i,;,; ] system being evaluated. l li t a l ! I 5 i so ST %*CWEA oTWE A STATUS Ca5 MY OaSCOVERY OESCRIPTf 0N 11 i s l l E l@ l 01 21 3l@l N/A l l Cl@l Coerability Test l | ||
5 i so ST %*CWEA oTWE A STATUS Ca5 MY OaSCOVERY OESCRIPTf 0N 11 i s l l E l@ l 01 21 3l@l N/A l l Cl@l Coerability Test l | |||
' ' " " '5 '* So ; | ' ' " " '5 '* So ; | ||
*JTivifv C01 TENT I | *JTivifv C01 TENT I | ||
AELEASED 08*ELEASE AVCUNT OF ACTIVITY LOCATICN OF RELEASE Ii is 4I l3 Z l @ l zi@l N/A l l N/A i l 7 13 11 44 45 ga l | AELEASED 08*ELEASE AVCUNT OF ACTIVITY LOCATICN OF RELEASE Ii is 4I l3 Z l @ l zi@l N/A l l N/A i l 7 13 11 44 45 ga l | ||
PE ASCNNEL EXPCSUAES j | PE ASCNNEL EXPCSUAES j | ||
NUV8Ea TvrE OESC AIPTICN U9 liI'li010l0l@lzl@lN/A | NUV8Ea TvrE OESC AIPTICN U9 liI'li010l0l@lzl@lN/A I | ||
I | |||
' ' ' 2 " 8o | ' ' ' 2 " 8o | ||
.E AScNN ENu'AiES I | .E AScNN ENu'AiES I | ||
Line 47: | Line 41: | ||
LOSS | LOSS | ||
'vpf OF CA OAMAGE TO SACiUITY h CESCRiPTION %/ | 'vpf OF CA OAMAGE TO SACiUITY h CESCRiPTION %/ | ||
12 13lIzl@lN/A | 12 13lIzl@lN/A 4 ) i3 50 l ] | ||
4 ) i3 50 l ] | |||
NRC USE CNLY , | NRC USE CNLY , | ||
ISSU E OE OM''TICN 12IalIN181N/A I i !Ii!l!tIIItl{ | ISSU E OE OM''TICN 12IalIN181N/A I i !Ii!l!tIIItl{ | ||
(303) 785-2253 AuMnA.o==Aaco PmCNE: h. . | (303) 785-2253 AuMnA.o==Aaco PmCNE: h. . | ||
t i REPORT DATE: May 15, 1980 REPORTABLE OCCURRENCE 80-20 l' ISSUE O OCCURRENCE DATE: Aoril 18,1980 Page 1 of 4 | |||
t | |||
i REPORT DATE: May 15, 1980 REPORTABLE OCCURRENCE 80-20 l' ISSUE O OCCURRENCE DATE: Aoril 18,1980 Page 1 of 4 | |||
; i i | ; i i | ||
FORT ST. VRAIN NUCLEAR GENERATING STATION PUBLIC SERVICE COMPANY OF COLORADO 16805 VELD COUNTY ROAD 19 1/2 PLATTEVILLE, COLORADO 80651 REPORT NO. 50-26 7/80-20/03-L-0 i | FORT ST. VRAIN NUCLEAR GENERATING STATION PUBLIC SERVICE COMPANY OF COLORADO 16805 VELD COUNTY ROAD 19 1/2 PLATTEVILLE, COLORADO 80651 REPORT NO. 50-26 7/80-20/03-L-0 i | ||
Line 68: | Line 52: | ||
During performance of the monthly check of the helium circulator seal malfunction pressure dif ferential switches, it was discovered that two | During performance of the monthly check of the helium circulator seal malfunction pressure dif ferential switches, it was discovered that two | ||
! of twelve switch units tripped outside the limits specified in LCO 4.4.1, Table 4.4-3. | ! of twelve switch units tripped outside the limits specified in LCO 4.4.1, Table 4.4-3. | ||
, Since reactor operation had taken place during the test interval, this i is reportable per Fort St. Vrain Technical Specification AC 7.5.2(b)1 | , Since reactor operation had taken place during the test interval, this i is reportable per Fort St. Vrain Technical Specification AC 7.5.2(b)1 and AC 7.5.2(b)2. | ||
and AC 7.5.2(b)2. | |||
EVENT DESCRIPTION: | EVENT DESCRIPTION: | ||
During normal plant operation, instrument personnel performed the circu-lator seal malfunction (buffer-mid-buffer) switch operability check. The switches are normally calibrated on an annual basis; however, due to the problems cited in the previous reports as listed on the LER, a check of buf fer-mid-buffer trip settings on a monthly basis has been undertaken as an interim measure to test operability. | During normal plant operation, instrument personnel performed the circu-lator seal malfunction (buffer-mid-buffer) switch operability check. The switches are normally calibrated on an annual basis; however, due to the problems cited in the previous reports as listed on the LER, a check of buf fer-mid-buffer trip settings on a monthly basis has been undertaken as an interim measure to test operability. | ||
Line 79: | Line 61: | ||
] | ] | ||
The trip settings for the twelve switches are listed in Table 1. | The trip settings for the twelve switches are listed in Table 1. | ||
The switch settings which were found to be less conservative than those | The switch settings which were found to be less conservative than those established by the Technical Specification did not prevent the fulfillment of the functional requirements of the system. | ||
established by the Technical Specification did not prevent the fulfillment of the functional requirements of the system. | |||
i | i | ||
_, ._ _ _._ _ __ , _ _ . . _ - , _ , , ,_ _ _,..-r _ .M | _, ._ _ _._ _ __ , _ _ . . _ - , _ , , ,_ _ _,..-r _ .M | ||
. _ = _ _ ._ - . .- _- | . _ = _ _ ._ - . .- _- | ||
.; | .; | ||
REPORTABLE OCCURRENCE 80-20 | REPORTABLE OCCURRENCE 80-20 | ||
-ISSUE 0 Page 2 of 4 | -ISSUE 0 Page 2 of 4 CAUSE : | ||
CAUSE : | |||
! DESCRIPT30I: | ! DESCRIPT30I: | ||
Dirt buildup and accumulation in the electrical switches prevented them 4 | Dirt buildup and accumulation in the electrical switches prevented them 4 | ||
from making proper contact. | from making proper contact. | ||
i i CORRECTIVE | i i CORRECTIVE ACTION: | ||
ACTION: | |||
The trip settings of the electrical switches were re-adjusted to the proper trip points. | The trip settings of the electrical switches were re-adjusted to the proper trip points. | ||
Due to the continuing problems being experienced with the electrical switches, the interim check of the trip settings is being conducted on a monthly basis. | Due to the continuing problems being experienced with the electrical switches, the interim check of the trip settings is being conducted on a monthly basis. | ||
Line 108: | Line 79: | ||
; existing equipment. | ; existing equipment. | ||
No further corrective action is anticipated or required. | No further corrective action is anticipated or required. | ||
'f I | 'f I | ||
i | i | ||
) . | ) . | ||
4 | 4 | ||
.- , , . , _. y e - - 3 -, _ - e 9 = e e- .-- | .- , , . , _. y e - - 3 -, _ - e 9 = e e- .-- | ||
REPORTABLE OCCL~ARENCE 80-20 ISSUE O Page 3 of 4 TABLE 1 As Found Inches H2O As Left Inches H2O Increasing l Decreasing Increasing Decreasing Trip Point i Trip Point Trip Point lt Trio Point lA Circulator PDIS-21149 '77 -5 +77 -5 PDIS-21151 +74 -7 +74 -7 P DIS-2115 3 +75 -5 +75 -5 13 Circulator PDIS-21155 +77 -5 +77 -5 PDIS-2115 7 +90h - 7 ,, +73 -7 PDIS-21159 +73 -9 +73 -9 1C Circulator PDIS-21150 +76 -7 +76 -7 PDIS-21152 +82h -21 h +74 -7 PDIS-21154 +76 -5 +76 -5 1D Circulator PDIS-21156 +74 -8 +74 -8 PDIS-21158 +77 -5 +77 -5 PDIS-21160 +75 -5 +75 -5 h Denotes switches which were out of tolerance. | |||
REPORTABLE OCCL~ARENCE 80-20 ISSUE O Page 3 of 4 TABLE 1 As Found Inches H2O As Left Inches H2O Increasing l Decreasing Increasing Decreasing Trip Point i Trip Point Trip Point lt Trio Point lA Circulator PDIS-21149 '77 -5 +77 -5 | |||
PDIS-21151 +74 -7 +74 -7 P DIS-2115 3 +75 -5 +75 -5 13 Circulator PDIS-21155 +77 -5 +77 -5 PDIS-2115 7 +90h - 7 ,, +73 -7 PDIS-21159 +73 -9 +73 -9 1C Circulator PDIS-21150 +76 -7 +76 -7 PDIS-21152 +82h -21 h +74 -7 PDIS-21154 +76 -5 +76 -5 1D Circulator PDIS-21156 +74 -8 +74 -8 PDIS-21158 +77 -5 +77 -5 PDIS-21160 +75 -5 +75 -5 h Denotes switches which were out of tolerance | |||
^ -- ~ - | ^ -- ~ - | ||
FIPORTABLE OCCURRENCE 80-20 ISSUE O Page 4 of 4 | FIPORTABLE OCCURRENCE 80-20 ISSUE O Page 4 of 4 | ||
~ | ~ | ||
Prepared By: _ 5 '''' C. C | Prepared By: _ 5 '''' C. C |
Revision as of 13:19, 1 February 2020
ML19305E836 | |
Person / Time | |
---|---|
Site: | Fort Saint Vrain ![]() |
Issue date: | 05/15/1980 |
From: | Gahm J PUBLIC SERVICE CO. OF COLORADO |
To: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
Shared Package | |
ML19305E834 | List: |
References | |
LER-80-020-03L, LER-80-20-3L, NUDOCS 8005200507 | |
Download: ML19305E836 (5) | |
Text
_ -_
NOC (b;'M 365 U. S. NUCLE AR REGULATORY CCMMISSION (7 77)
LICENSEE EVENT REPORT 8005200507 C) CcNTRcL stCCx: I ! I I I I g (PLEASE PRINT OR TYPE ALL REQUIREO INFORMATION) lo t i8 l 7l c I O 7
I F l S I V l 1 15l@l 010 l- !LICENSE LICENSEE COCE 14 0 l0 lNuveta 01010 l- l010 25 l@l4 26 l1 Il !2Tvet LICENSE IOJ3l@l57 CAT l 64 l@
Cc.vT l0I1I F 4 S [Md00l L l@l 0 l 5OCCK 6i l 010 l0 l 21617 ET NUVS E A 64
@l 69 014 Il 18 l 810 l@l O! 5l EVENT DATE 74 75 11QATE AEPCAT 31 Sl Ol@ dG EVENT DESCRIPTION AND PROBA8LE CCNSEQUENCES h lo12l lDuring testing, it was discovered that two of twelve helium circulater seal malfunc- l lo!3l l tion pressure differential switch units tripped outside the limits of LCO 4.4.1, I laiAIITable 4.4-3. Reactor coeration durinz test interval. Recortable oer Technical Soeci-l l a i 3 ! t fication AC 7.5.2(b)1 and AC 7.3.2(b)2. No effect on public health or safety. Re- l la is l ldundant system available and operable. Similar reports are RO 77-47 Final. and Pre- l l c j 71 l liminary reports RO 78-2 7. RO 79-32. RO 79-56. R0 80-07, and R0 S0-16. I I
10!31 I 30 7 i SYSTEM CAUSE CAUSE C OVP. VALVE COCE CCCE SUECOCE COMPCNENT CODE SUBCOCE SUBCOCE 10191 7 3 9 l C l a l@ It l@ It l@ l 11 10 ii 12 f2 Ni s l Tl RI ul@ i8 l s l@ I z i@
is .0
, SECUENTI A L CCOU A AENCE REPCAT REVISICN gga oo EVENT YE A A AEPORT NC C00E TvPE No.
@ PE ,7 I 81 01 ( --J l 0l 21 Ol l/l 10131 lLl l-l l ul
_.2, a n 2 a 27 2. a u si 22 TA N AYT C C PLANT v C wCURS S8 iT SCA 8. SL P8 LI E MA UFACT RER lx l@lx l@ i35z l@ Iz l@ l 01 of ol nl 3/
i yl@ l42N I@ l43NI@ l4As i 01 a l Ol@
JJ J4 36 40 ei 47 CAUSE CESCRIPTICN AND CCRRECTIVE ACTICNS h lilal lITT Barton Model 239 pressure dif ferential switches failed to actuate at trio coint I til-l jdue to dirt accu =ulation in electrical switches. Affected switches re-adiusted to i
- i,,j l proper trip points. Trip settings being checked on a =cnthly basis. Redis12n of I i,;,; ] system being evaluated. l li t a l ! I 5 i so ST %*CWEA oTWE A STATUS Ca5 MY OaSCOVERY OESCRIPTf 0N 11 i s l l E l@ l 01 21 3l@l N/A l l Cl@l Coerability Test l
' ' " " '5 '* So ;
- JTivifv C01 TENT I
AELEASED 08*ELEASE AVCUNT OF ACTIVITY LOCATICN OF RELEASE Ii is 4I l3 Z l @ l zi@l N/A l l N/A i l 7 13 11 44 45 ga l
PE ASCNNEL EXPCSUAES j
NUV8Ea TvrE OESC AIPTICN U9 liI'li010l0l@lzl@lN/A I
' ' ' 2 " 8o
.E AScNN ENu'AiES I
NUvsER CE SCRIPTION li 141 7 s 2 1010101@l n i2 N/A ,o i
LOSS
'vpf OF CA OAMAGE TO SACiUITY h CESCRiPTION %/
12 13lIzl@lN/A 4 ) i3 50 l ]
NRC USE CNLY ,
ISSU E OE OMTICN 12IalIN181N/A I i !Ii!l!tIIItl{
(303) 785-2253 AuMnA.o==Aaco PmCNE: h. .
t i REPORT DATE: May 15, 1980 REPORTABLE OCCURRENCE 80-20 l' ISSUE O OCCURRENCE DATE: Aoril 18,1980 Page 1 of 4
- i i
FORT ST. VRAIN NUCLEAR GENERATING STATION PUBLIC SERVICE COMPANY OF COLORADO 16805 VELD COUNTY ROAD 19 1/2 PLATTEVILLE, COLORADO 80651 REPORT NO. 50-26 7/80-20/03-L-0 i
Final IDENTIFICATION OF OCCURRENCE :
During performance of the monthly check of the helium circulator seal malfunction pressure dif ferential switches, it was discovered that two
! of twelve switch units tripped outside the limits specified in LCO 4.4.1, Table 4.4-3.
, Since reactor operation had taken place during the test interval, this i is reportable per Fort St. Vrain Technical Specification AC 7.5.2(b)1 and AC 7.5.2(b)2.
EVENT DESCRIPTION:
During normal plant operation, instrument personnel performed the circu-lator seal malfunction (buffer-mid-buffer) switch operability check. The switches are normally calibrated on an annual basis; however, due to the problems cited in the previous reports as listed on the LER, a check of buf fer-mid-buffer trip settings on a monthly basis has been undertaken as an interim measure to test operability.
There are twelve buffer-mid-buffer switch units, three per circulator.
Each switch unit contains two electrical switches. The range of the i swnsing element is f rom (-) 100 inches of water to zero to (+) 100 inches of water. One of the electrical switches in each unit must operate at 4
greater than or equal to (-) 10 inches water (negative buffer-mid-buf fer),
and the other . electrical switch must operate at less than or equal to (A) 80 inches water (positive buffer-sid-buffer) per Table 4.4-3.
]
The trip settings for the twelve switches are listed in Table 1.
The switch settings which were found to be less conservative than those established by the Technical Specification did not prevent the fulfillment of the functional requirements of the system.
i
_, ._ _ _._ _ __ , _ _ . . _ - , _ , , ,_ _ _,..-r _ .M
. _ = _ _ ._ - . .- _-
.;
REPORTABLE OCCURRENCE 80-20
-ISSUE 0 Page 2 of 4 CAUSE :
! DESCRIPT30I:
Dirt buildup and accumulation in the electrical switches prevented them 4
from making proper contact.
i i CORRECTIVE ACTION:
The trip settings of the electrical switches were re-adjusted to the proper trip points.
Due to the continuing problems being experienced with the electrical switches, the interim check of the trip settings is being conducted on a monthly basis.
The investigation of the problem associated with the helium circulator seal malfunction trip switches has been completed, and Public Service
- Company Nuclear Project Department is proceeding on a path to replace the
- existing equipment.
No further corrective action is anticipated or required.
'f I
i
) .
4
.- , , . , _. y e - - 3 -, _ - e 9 = e e- .--
REPORTABLE OCCL~ARENCE 80-20 ISSUE O Page 3 of 4 TABLE 1 As Found Inches H2O As Left Inches H2O Increasing l Decreasing Increasing Decreasing Trip Point i Trip Point Trip Point lt Trio Point lA Circulator PDIS-21149 '77 -5 +77 -5 PDIS-21151 +74 -7 +74 -7 P DIS-2115 3 +75 -5 +75 -5 13 Circulator PDIS-21155 +77 -5 +77 -5 PDIS-2115 7 +90h - 7 ,, +73 -7 PDIS-21159 +73 -9 +73 -9 1C Circulator PDIS-21150 +76 -7 +76 -7 PDIS-21152 +82h -21 h +74 -7 PDIS-21154 +76 -5 +76 -5 1D Circulator PDIS-21156 +74 -8 +74 -8 PDIS-21158 +77 -5 +77 -5 PDIS-21160 +75 -5 +75 -5 h Denotes switches which were out of tolerance.
^ -- ~ -
FIPORTABLE OCCURRENCE 80-20 ISSUE O Page 4 of 4
~
Prepared By: _ 5 ' C. C
! Asa 3. Reed
.! Technical ';ervices Technician i
Reviewed By: -
//
. W. Tahm
! / Technical Services Supervisor
i Reviewed By:
Frank R. Mathie Operations Manager Approved By: 4~ [undw Don Warembourg gf Manager, Nuclear Prodhetion I
i i
- _ . - ,.