ML19256G098: Difference between revisions
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{{#Wiki_filter:' U. S. NUCLE AR REGULATORY COMMISSION NRC FORM OGG (7-77) | {{#Wiki_filter:' U. S. NUCLE AR REGULATORY COMMISSION NRC FORM OGG (7-77) | ||
LICENSEE EVENT REPORT CONT HOL BLOCK: l l l l l l l (PLE ASE l'RINT OR TYPE ALL REQUIRED INFORMATION) 1 6 o 1 l o l 11 l D l B l S l 114 l@llb0 l 0 | LICENSEE EVENT REPORT CONT HOL BLOCK: l l l l l l l (PLE ASE l'RINT OR TYPE ALL REQUIRED INFORMATION) 1 6 o 1 l o l 11 l D l B l S l 114 l@llb0 l 0 | ||
- l 0 l 0 l N l p l v l- l 0 l 3_j@l4 h 2t> | - l 0 l 0 l N l p l v l- l 0 l 3_j@l4 h 2t> | ||
Line 25: | Line 24: | ||
51 CA T bd l@ | 51 CA T bd l@ | ||
7 8 9 LICLNSEE CODE LICENSE NUMdLR CON'T loIil S$ | 7 8 9 LICLNSEE CODE LICENSE NUMdLR CON'T loIil S$ | ||
$ [ L Jgl 0 l 5 l 0 l - l 0 l 3 l 4 l 686 l@] 1 lEVENT 1l2 l 3 17_ l 975l@l1l2l2l0l7 74 REPORT DAT E 980 @ | $ [ L Jgl 0 l 5 l 0 l - l 0 l 3 l 4 l 686 l@] 1 lEVENT 1l2 l 3 17_ l 975l@l1l2l2l0l7 74 REPORT DAT E 980 @ | ||
COCKErNUYBER 63 DATE 7 8 60 61 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h o 2 On November 23, 1979 at 2315 hours, Control Rod Group 5 Rod 11 Absolute Position IndI-l o13 l cation (API) was declared inoperable due to fluctuating signals which caused numerous I j | COCKErNUYBER 63 DATE 7 8 60 61 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h o 2 On November 23, 1979 at 2315 hours, Control Rod Group 5 Rod 11 Absolute Position IndI-l o13 l cation (API) was declared inoperable due to fluctuating signals which caused numerous I j | ||
Line 51: | Line 49: | ||
Ii15l El@ 0l 7 3lh NA l lAl@l NA ACTIVITY COrTENT LOCATION oF RELEASE RELE ASED OF RELE ASE AMOUNT OF ACTIVITY l NA l NA l li l6 8I 9W @ l Z l@l 7 to 11 44 45 80 PERSONNEL EXPOSURES NUMBE R TYPE DE SCRIP TION l | Ii15l El@ 0l 7 3lh NA l lAl@l NA ACTIVITY COrTENT LOCATION oF RELEASE RELE ASED OF RELE ASE AMOUNT OF ACTIVITY l NA l NA l li l6 8I 9W @ l Z l@l 7 to 11 44 45 80 PERSONNEL EXPOSURES NUMBE R TYPE DE SCRIP TION l | ||
i 7 1010 l0j@lz l@l NA " | i 7 1010 l0j@lz l@l NA " | ||
PEnsONNE t iN;uNiES NuvetR li la 8i 9lo 010 @l NA DEsCR4riON@ | |||
PEnsONNE t iN;uNiES | |||
NuvetR li la 8i 9lo 010 @l NA DEsCR4riON@ | |||
)b43 2hd 80 l | )b43 2hd 80 l | ||
7 11 12 LOSS OF On D AV AGE 1O F ACILITY TYPE DE SCRIP TION l | 7 11 12 LOSS OF On D AV AGE 1O F ACILITY TYPE DE SCRIP TION l | ||
i 9 (Z_j@lNA C0 F 8 9 10 | i 9 (Z_j@lNA C0 F 8 9 10 1% | ||
l 2101 [dUE 10@ln E CRIPTION i IIl1111111112 Eu & | l 2101 [dUE 10@ln E CRIPTION i IIl1111111112 Eu & | ||
68 69 1 8 9 419-259-5000, Ext. 231 DVR 79-186 NAME OF PHEPARER John Herner PHONE: | 68 69 1 8 9 419-259-5000, Ext. 231 DVR 79-186 NAME OF PHEPARER John Herner PHONE: | ||
TOLEDO EDISON COMPANY DAVIS-BESSE NUCLE 4R POWER STATION UNIT ONE SUPPLEMENTAL INF0tCIATION FOR LER NP-33-79-141 DATE OF EVENT: November 23, 1979 FACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE: Fluctuating indication on the absolute position indi-cation f or Control Rod 5-11 , | TOLEDO EDISON COMPANY DAVIS-BESSE NUCLE 4R POWER STATION UNIT ONE SUPPLEMENTAL INF0tCIATION FOR LER NP-33-79-141 DATE OF EVENT: November 23, 1979 FACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE: Fluctuating indication on the absolute position indi-cation f or Control Rod 5-11 , | ||
i The unit was in Mode 1, with Power (MRT) = 2024, l Conditions Prior to Occurrence: j and Load (Cross MWE) = 685. | i The unit was in Mode 1, with Power (MRT) = 2024, l Conditions Prior to Occurrence: j and Load (Cross MWE) = 685. | ||
t Description of Occurrence: On November 23, 1979 at 2315 hours, Control Rod Group 5 Rod 11 Absolute Position Indication (API) was declared inoperable due to fluctuating signals which caused numerous " Asymmetric Rod" alarms. This placed the unit in the action statement of Technical Specification 3.1.3.3 which required the position of the control rod to be verified by actuating one of its zone reference indicators. | t Description of Occurrence: On November 23, 1979 at 2315 hours, Control Rod Group 5 Rod 11 Absolute Position Indication (API) was declared inoperable due to fluctuating signals which caused numerous " Asymmetric Rod" alarms. This placed the unit in the action statement of Technical Specification 3.1.3.3 which required the position of the control rod to be verified by actuating one of its zone reference indicators. | ||
The rod position was verified at its 100% withdrawn position per the action state-ment,and the rod was placed in asymmetric bypass. | The rod position was verified at its 100% withdrawn position per the action state-ment,and the rod was placed in asymmetric bypass. | ||
Line 77: | Line 67: | ||
LER #79-116 fh43 28} | LER #79-116 fh43 28} | ||
TOLEDO EDISON COMPANY DAVIS-BESSE NUCLEAR POWER STATION UNIT ONE PAGE 2 SUPPLEMENTAL INFORMATION FOR LER NP-33-79-141 Failure Data: There have been sixteen previous failures of control rod APIS, how-ever, the origin of these f ailures has not been due to a common component; see Licensee Event Reports NP-33-77-63, NP-33-78-02, NP-33-78-19, hT-33-78-26, NP-33-78-38, NP-33-78-135, NP-33-78-144, NP-33-78-149, NP-33-79-31, NP-33-79-59, hT-33-79-90, hT-33-7 9-97, NP-33-79-100, NP-33-79-116, NP-33-79-137, and NP-33-79-138. | TOLEDO EDISON COMPANY DAVIS-BESSE NUCLEAR POWER STATION UNIT ONE PAGE 2 SUPPLEMENTAL INFORMATION FOR LER NP-33-79-141 Failure Data: There have been sixteen previous failures of control rod APIS, how-ever, the origin of these f ailures has not been due to a common component; see Licensee Event Reports NP-33-77-63, NP-33-78-02, NP-33-78-19, hT-33-78-26, NP-33-78-38, NP-33-78-135, NP-33-78-144, NP-33-78-149, NP-33-79-31, NP-33-79-59, hT-33-79-90, hT-33-7 9-97, NP-33-79-100, NP-33-79-116, NP-33-79-137, and NP-33-79-138. | ||
Rod 5-11 recently had a new PI assembly and hi temperature cable installed. | Rod 5-11 recently had a new PI assembly and hi temperature cable installed. | ||
LER #79-116 | LER #79-116 1643 286}} | ||
1643 286}} |
Latest revision as of 00:08, 2 February 2020
ML19256G098 | |
Person / Time | |
---|---|
Site: | Davis Besse ![]() |
Issue date: | 12/20/1979 |
From: | Werner J TOLEDO EDISON CO. |
To: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
Shared Package | |
ML19256G093 | List: |
References | |
LER-79-116-03L, LER-79-116-3L, NUDOCS 7912270420 | |
Download: ML19256G098 (3) | |
Text
' U. S. NUCLE AR REGULATORY COMMISSION NRC FORM OGG (7-77)
LICENSEE EVENT REPORT CONT HOL BLOCK: l l l l l l l (PLE ASE l'RINT OR TYPE ALL REQUIRED INFORMATION) 1 6 o 1 l o l 11 l D l B l S l 114 l@llb0 l 0
- l 0 l 0 l N l p l v l- l 0 l 3_j@l4 h 2t>
1LICENSE ll l1l1l@!
TYPE JO l
51 CA T bd l@
7 8 9 LICLNSEE CODE LICENSE NUMdLR CON'T loIil S$
$ [ L Jgl 0 l 5 l 0 l - l 0 l 3 l 4 l 686 l@] 1 lEVENT 1l2 l 3 17_ l 975l@l1l2l2l0l7 74 REPORT DAT E 980 @
COCKErNUYBER 63 DATE 7 8 60 61 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h o 2 On November 23, 1979 at 2315 hours0.0268 days <br />0.643 hours <br />0.00383 weeks <br />8.808575e-4 months <br />, Control Rod Group 5 Rod 11 Absolute Position IndI-l o13 l cation (API) was declared inoperable due to fluctuating signals which caused numerous I j
o 4 ]" asymmetric rod" alarms. This placed the unit in the action statement of Technical O s l Specification 3.1.3.3. There was no danger to the health and safety of the public or ]
o c to station personnel. The control rod never deviated from its intended position, onlyJ l
"o 7 lthe API was faulty. (NP-33-79-141) l 0 8 80 CAUSE CAUSE CoVP. VALVE SYSTEM SUBCODE SUBCOCE CODE CODE SUeCODE COYPONEN T CODE 7
o 9 8
l IlE l@ Wh l X l@ lX X lX lX lX lX l@ [X]@ l Xl @
9 10 ft 12 13 16 19 20 REVISION SE QU E N TI AL OCCURRENCE HEFOHT CODE TYPE N O.
,_ EVENT YE AR REPORT NO.
tt p p0 h PrPg l21 7 9l l-l [1 l 1 6l 24 26
]/]
21 l0l3 28 29 Ll 30
[---J 31 W
32
_ 22 23 HOUPS S 8 k FOR1 8. S PLIE MA FACT Rf H AKE ACT N ON Pt A T ET C IE JJ j@lXl@
34 l Z l@
3S lJ6Z l@ l0l0l010]
3/ 40 W@ lX l@ lNl@ lXlX'XlXl@
el 42 43 44 4/
CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h i o lThe exact cause of this occurrence is still undetermined but has been isolated to the l i i l position indication assembly and cabling between the electrical penetration and the g,j,;jrod. Investigation still is in progress at this time. When the plant is started up, ;
recorder for further j i j 3 l lthe inputs from the test connection will be monitored on a chart
]
Ii [4 i levaluat ion. 80 7 8 9 OTHER STATUS blSC HY DISCOVERY DESCRIPTION ST U3 % POWE H l
Ii15l El@ 0l 7 3lh NA l lAl@l NA ACTIVITY COrTENT LOCATION oF RELEASE RELE ASED OF RELE ASE AMOUNT OF ACTIVITY l NA l NA l li l6 8I 9W @ l Z l@l 7 to 11 44 45 80 PERSONNEL EXPOSURES NUMBE R TYPE DE SCRIP TION l
i 7 1010 l0j@lz l@l NA "
PEnsONNE t iN;uNiES NuvetR li la 8i 9lo 010 @l NA DEsCR4riON@
)b43 2hd 80 l
7 11 12 LOSS OF On D AV AGE 1O F ACILITY TYPE DE SCRIP TION l
i 9 (Z_j@lNA C0 F 8 9 10 1%
l 2101 [dUE 10@ln E CRIPTION i IIl1111111112 Eu &
68 69 1 8 9 419-259-5000, Ext. 231 DVR 79-186 NAME OF PHEPARER John Herner PHONE:
TOLEDO EDISON COMPANY DAVIS-BESSE NUCLE 4R POWER STATION UNIT ONE SUPPLEMENTAL INF0tCIATION FOR LER NP-33-79-141 DATE OF EVENT: November 23, 1979 FACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE: Fluctuating indication on the absolute position indi-cation f or Control Rod 5-11 ,
i The unit was in Mode 1, with Power (MRT) = 2024, l Conditions Prior to Occurrence: j and Load (Cross MWE) = 685.
t Description of Occurrence: On November 23, 1979 at 2315 hours0.0268 days <br />0.643 hours <br />0.00383 weeks <br />8.808575e-4 months <br />, Control Rod Group 5 Rod 11 Absolute Position Indication (API) was declared inoperable due to fluctuating signals which caused numerous " Asymmetric Rod" alarms. This placed the unit in the action statement of Technical Specification 3.1.3.3 which required the position of the control rod to be verified by actuating one of its zone reference indicators.
The rod position was verified at its 100% withdrawn position per the action state-ment,and the rod was placed in asymmetric bypass.
Designation of Apparent Cause of Occurrence: The exact cause of this occurrence is still undetermined but has been isolated to the position indication assembly and Inves-cabling between the containment external electrical penetration and the rod.
tigation still is in progress at this time.
Analysis of Occurrence: There was no danger to the health and safety of the public or to station personnel. The control rod never deviated from its intended position, only the API was faulty.
Corrective Action: The output of Rod 5-ll's API amplifier was put on a trend recorder and noted to fluctuate in an intermittent and irregular manner. Under work request IC-55-24-79, the API input was checked and also found to fluctuate. The position indication (PI) assembly was then disconnected and energized f rom a separate test source, and the output monitored. Fluctuations w 2re again noted, ef fectively isolat-ing the problem to the PI assembly and/or cabling.
During the plant shutdown on December 2,1979, a recorder was placed on the input to Rod 5-ll's API amplifier to observe the voltage change as the PI assembly reed switches operated. No apparent malfunctions were noted. With the assistance of a B&W technical representative, a test connection under Facility Change Request 79-424 was placed between the PI assembly and its associated cabling to monitor the various voltagcs at that point. The PI assembly was also adjusted at the direction of the B&W representa~tive under Maintenance Work Order 79-3691. When the plant is started up the inputs from the test connection will be monitored on a chart recorder for further evaluation.
LER #79-116 fh43 28}
TOLEDO EDISON COMPANY DAVIS-BESSE NUCLEAR POWER STATION UNIT ONE PAGE 2 SUPPLEMENTAL INFORMATION FOR LER NP-33-79-141 Failure Data: There have been sixteen previous failures of control rod APIS, how-ever, the origin of these f ailures has not been due to a common component; see Licensee Event Reports NP-33-77-63, NP-33-78-02, NP-33-78-19, hT-33-78-26, NP-33-78-38, NP-33-78-135, NP-33-78-144, NP-33-78-149, NP-33-79-31, NP-33-79-59, hT-33-79-90, hT-33-7 9-97, NP-33-79-100, NP-33-79-116, NP-33-79-137, and NP-33-79-138.
Rod 5-11 recently had a new PI assembly and hi temperature cable installed.
LER #79-116 1643 286