ML19249A529: Difference between revisions
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{{#Wiki_filter:U. S. NUCLE AR REGUL ATORY COMMISSION NRC F ORM 36G | {{#Wiki_filter:U. S. NUCLE AR REGUL ATORY COMMISSION NRC F ORM 36G (7-7 7) | ||
(7-7 7) | |||
LICENSEE EVENT REPORT CONTROL DLOCK: l l l l l l I (PLEASE PRINT OR ".YPE ALL REQUIRED INFORMATION) 1 6 l0 l1l l0 l H j D l B l S 1 @l 0l 0l -l 0 0lN lP lD l-l013l@l4 l1l1 Il l1 l@l 23 26 LICEN50 T yP; JO l | LICENSEE EVENT REPORT CONTROL DLOCK: l l l l l l I (PLEASE PRINT OR ".YPE ALL REQUIRED INFORMATION) 1 6 l0 l1l l0 l H j D l B l S 1 @l 0l 0l -l 0 0lN lP lD l-l013l@l4 l1l1 Il l1 l@l 23 26 LICEN50 T yP; JO l | ||
$ / t. A T 58 l@ | $ / t. A T 58 l@ | ||
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, 4 gpump bearings with high temperature lubricant will be installed under M"O 70-159A. 80 7 8 9 STA S % POWER OTHER STATUS DtSCO R DISCOVERY DESCRIPTION i s (E_j@ lll0l0 @ NA l l A l@l Operator observation l ACTIVITY CO TENT RE LE ASEC, OF RE LC ASE AMOUNT OF ACTIVITY LOCATION OF RELE ASE 7 | , 4 gpump bearings with high temperature lubricant will be installed under M"O 70-159A. 80 7 8 9 STA S % POWER OTHER STATUS DtSCO R DISCOVERY DESCRIPTION i s (E_j@ lll0l0 @ NA l l A l@l Operator observation l ACTIVITY CO TENT RE LE ASEC, OF RE LC ASE AMOUNT OF ACTIVITY LOCATION OF RELE ASE 7 | ||
i G 8 9 W h d@l 10 11 NA 44 l l 45 NA 80 PE RSONNEL E MPO5URES NU9HER TYPE DESCHIPTION i 7 1010 l o j@[zj@l NA " | i G 8 9 W h d@l 10 11 NA 44 l l 45 NA 80 PE RSONNEL E MPO5URES NU9HER TYPE DESCHIPTION i 7 1010 l o j@[zj@l NA " | ||
l | l PERSONNE t N;uW,ES NuvaE n DESCR. riON@ .. | ||
/ (#IZ NA l li ls l8 l9 0 l 0 l 0 l@l 7 11 12 80 T l'E s'C"'A'l ''''"" @ 79082305M l i o [ z_j@ NA 8 9 10 80 7 | |||
PERSONNE t N;uW,ES | |||
NuvaE n DESCR. riON@ .. | |||
/ (#IZ | |||
NA l li ls l8 l9 0 l 0 l 0 l@l 7 11 12 80 | |||
T l'E s'C"'A'l ''''"" @ 79082305M l i o [ z_j@ NA 8 9 10 80 7 | |||
evotic' NRC USE ONLY . | evotic' NRC USE ONLY . | ||
7 2 o 8 9 | 7 2 o 8 9 | ||
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419-259-5000, Ext. 292 DVR 79-119 NAME OF PREPARER Craic E. Jensen PHONE: { | 419-259-5000, Ext. 292 DVR 79-119 NAME OF PREPARER Craic E. Jensen PHONE: { | ||
TOLEDO EDISON COMPANY DAVIS-BESSE NUCLEAR POWER STATION UNIT ONE SUPPLEMENTAL INFORMATION FOR LER NP-33-79-98 DATE OF EVENT: July 22, 1979 FACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE: Containment Post-Accident Radiation Monitor RE 5030 was inoperable Conditions Prior to Occurrence: The unit was in Mode 1, with Power (MWT) = 2755, and Load (Gros MWE) = 908. | TOLEDO EDISON COMPANY DAVIS-BESSE NUCLEAR POWER STATION UNIT ONE SUPPLEMENTAL INFORMATION FOR LER NP-33-79-98 DATE OF EVENT: July 22, 1979 FACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE: Containment Post-Accident Radiation Monitor RE 5030 was inoperable Conditions Prior to Occurrence: The unit was in Mode 1, with Power (MWT) = 2755, and Load (Gros MWE) = 908. | ||
Description of Occurrence: At 1610 hours on July 22, 1979, the Post-Accident Radia-tion Monitor RE 5030 was found to be off as the overloads on the motor were tripped. | Description of Occurrence: At 1610 hours on July 22, 1979, the Post-Accident Radia-tion Monitor RE 5030 was found to be off as the overloads on the motor were tripped. | ||
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Improvea pump oearings witu nign temperature rated luoricant will oe installed per Maintenance Work Order 78-159A. Facility Change Request 78-521 has been written to reduce pump speed in order to decrease the load on the pump bearings. A preventa-tive maintenance program has been established for these radiation monitor pumps. | Improvea pump oearings witu nign temperature rated luoricant will oe installed per Maintenance Work Order 78-159A. Facility Change Request 78-521 has been written to reduce pump speed in order to decrease the load on the pump bearings. A preventa-tive maintenance program has been established for these radiation monitor pumps. | ||
LER #79-085 *g/gjy | LER #79-085 *g/gjy | ||
TOLEDO EDISON COfiPANY DA\ IS-BESSE NUCLEAR POWER STATT.0N U'IIT ONE PAGE 2 SUPPLEMENTAL INFORMATION FOR LER NP-33-79-98 Failure Data: This is a repetitive failure. Previous pump related problems with the radiation monitors have been reported in Licensee Event Reports NP-33-78-30, NP-33-78-45, NP-33-78-54, NP-33-78-77, NP-33-79-37, NP-33-79-42, NP-33-79-95, and NP-33-79-96. | TOLEDO EDISON COfiPANY DA\ IS-BESSE NUCLEAR POWER STATT.0N U'IIT ONE PAGE 2 SUPPLEMENTAL INFORMATION FOR LER NP-33-79-98 Failure Data: This is a repetitive failure. Previous pump related problems with the radiation monitors have been reported in Licensee Event Reports NP-33-78-30, NP-33-78-45, NP-33-78-54, NP-33-78-77, NP-33-79-37, NP-33-79-42, NP-33-79-95, and NP-33-79-96. | ||
LER #79-085 YSl5sTj"l}} | LER #79-085 YSl5sTj"l}} | ||
Revision as of 01:08, 2 February 2020
| ML19249A529 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 08/17/1979 |
| From: | Jensen C TOLEDO EDISON CO. |
| To: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| Shared Package | |
| ML19249A526 | List: |
| References | |
| LER-79-085-03L, LER-79-85-3L, NUDOCS 7908230529 | |
| Download: ML19249A529 (3) | |
Text
U. S. NUCLE AR REGUL ATORY COMMISSION NRC F ORM 36G (7-7 7)
LICENSEE EVENT REPORT CONTROL DLOCK: l l l l l l I (PLEASE PRINT OR ".YPE ALL REQUIRED INFORMATION) 1 6 l0 l1l l0 l H j D l B l S 1 @l 0l 0l -l 0 0lN lP lD l-l013l@l4 l1l1 Il l1 l@l 23 26 LICEN50 T yP; JO l
$ / t. A T 58 l@
7 8 9 LICENSEE C09E 14 15 LICE N3E NuMt1E H CON'T 7
lol1l 7 8
[n"c l L l@l 0 [ 5COCKET b> 61 l 0 l- l 0 l 3 l 4 l 6 l@l NUVBEH M b1 0DATE ENENT l 7 l 2 l2 l 7 l 9 @[0 l 8 l 1 l 7 l 7 l 9 14 75 REPORT D ATE HJ EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h o 2 l Af ter tripping and being reset several times, Containment Post-Accident Radiation Monii o a ] tor RE 5030 was declared inoperable at 0430 hours0.00498 days <br />0.119 hours <br />7.109788e-4 weeks <br />1.63615e-4 months <br /> on 7/23/79. This placed the unit inl Th_re was no danger to the health and safety of l o 4 Ithe Action Statement of T.S. 3.3.3.6.
lo Is! I the public or station personnel. RE 5030 does not control any equipment but is used l o G l for conitoring purposes only. The redundant monitor, RE 5029, was operable during thel l o j i j l periods that RE 5030 was inoperable. (NP-33-79-98) l I
o a i 60 SYSTEM CAUSE CAUSE COVP. VALVE CODE CODE SUSCODE COYPONENT CODE SU8 CODE SUBCODE 1o191 I n l a l@ LLi@ Lal@ I r l u l M I P xixl@
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OCCU R R E N CE REPORT REVISION SE QUENTI AL E REPORT NO. CODE TYPE N O.
LER RO
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43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS ji o ]The cause of this occurrence was component failure. The motor was drawing excessivo I i i [ current and tripping on overload because of a loss of Iubrication of the pump bear- 1 y,,,,lings due to high ambient temperature. The pump was replaced with a rebuilt pump, l i l 3 l l RE 5030 surveillance tested and declared operable at 0600 hours0.00694 days <br />0.167 hours <br />9.920635e-4 weeks <br />2.283e-4 months <br /> on 7/23/79. Improved l
, 4 gpump bearings with high temperature lubricant will be installed under M"O 70-159A. 80 7 8 9 STA S % POWER OTHER STATUS DtSCO R DISCOVERY DESCRIPTION i s (E_j@ lll0l0 @ NA l l A l@l Operator observation l ACTIVITY CO TENT RE LE ASEC, OF RE LC ASE AMOUNT OF ACTIVITY LOCATION OF RELE ASE 7
i G 8 9 W h d@l 10 11 NA 44 l l 45 NA 80 PE RSONNEL E MPO5URES NU9HER TYPE DESCHIPTION i 7 1010 l o j@[zj@l NA "
l PERSONNE t N;uW,ES NuvaE n DESCR. riON@ ..
/ (#IZ NA l li ls l8 l9 0 l 0 l 0 l@l 7 11 12 80 T l'E s'C"'A'l '"" @ 79082305M l i o [ z_j@ NA 8 9 10 80 7
evotic' NRC USE ONLY .
7 2 o 8 9
[d@loEYCniPTiON 10 m @ l 68 69 l ll1ltll1 83 5
]
419-259-5000, Ext. 292 DVR 79-119 NAME OF PREPARER Craic E. Jensen PHONE: {
TOLEDO EDISON COMPANY DAVIS-BESSE NUCLEAR POWER STATION UNIT ONE SUPPLEMENTAL INFORMATION FOR LER NP-33-79-98 DATE OF EVENT: July 22, 1979 FACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE: Containment Post-Accident Radiation Monitor RE 5030 was inoperable Conditions Prior to Occurrence: The unit was in Mode 1, with Power (MWT) = 2755, and Load (Gros MWE) = 908.
Description of Occurrence: At 1610 hours0.0186 days <br />0.447 hours <br />0.00266 weeks <br />6.12605e-4 months <br /> on July 22, 1979, the Post-Accident Radia-tion Monitor RE 5030 was found to be off as the overloads on the motor were tripped.
The overloads were reset and pump restarted at 1650 hours0.0191 days <br />0.458 hours <br />0.00273 weeks <br />6.27825e-4 months <br />. After tripping repeatedly, RE 5030 was declared inoperable at 0430 hours0.00498 days <br />0.119 hours <br />7.109788e-4 weeks <br />1.63615e-4 months <br /> on July 23, 1979.
This placed the unit in the action statement of Technical Specification 3.3.3.6 which requires that two post-accident containment monitoring systems be operable in Modes 1, 2, or 3. The action statement requires that the inoperable radiation moni-tor be returned to service within 30 days or the unit must be placed in hot shutdown (Mode 4) within the next 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />.
Designation of Apparent Cause of Occurrence: Upon disassembly of the f ailed pump, it was discovered the failure was caused by the bearing losing lubrication due to high ambient temperature and severe service conditions.
Analysis of Occurrence: There was no danger to the health and safety of the public or to station personnel. This instrument does not control any equipment but is used for monitoring purposes only. No other systems were affected by this occurrence.
No incident requiring use of this instrumentation occurred during the time the moni-tor was inoperable. The other containment post-accident radiation monitor, RE 5029, was operable during the periods that RE 5030 was inoperable.
Corrective Action: Under Maintenance Work Order 79-1906, the pump was replaced on RE 5030 with a rebuilt pump. On July 23, 1979 at 0600 hourc, Surveillance Test ST 5032.01, " Monthly Functional Test of Radiation Monitoring System" was completed and RE 5030 was declared operable, removing the unit from the action statement of Technical Specification 3.3.3.6.
Improvea pump oearings witu nign temperature rated luoricant will oe installed per Maintenance Work Order 78-159A. Facility Change Request 78-521 has been written to reduce pump speed in order to decrease the load on the pump bearings. A preventa-tive maintenance program has been established for these radiation monitor pumps.
LER #79-085 *g/gjy
TOLEDO EDISON COfiPANY DA\ IS-BESSE NUCLEAR POWER STATT.0N U'IIT ONE PAGE 2 SUPPLEMENTAL INFORMATION FOR LER NP-33-79-98 Failure Data: This is a repetitive failure. Previous pump related problems with the radiation monitors have been reported in Licensee Event Reports NP-33-78-30, NP-33-78-45, NP-33-78-54, NP-33-78-77, NP-33-79-37, NP-33-79-42, NP-33-79-95, and NP-33-79-96.
LER #79-085 YSl5sTj"l