ML19329B855
| ML19329B855 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 09/12/1977 |
| From: | Borysiak M, Lingenfelter J TOLEDO EDISON CO. |
| To: | |
| Shared Package | |
| ML19329B856 | List: |
| References | |
| NUDOCS 8002060863 | |
| Download: ML19329B855 (3) | |
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LICENSEE EVEt f F3EPORT p.L J I i 'l_J CoNinoi si OCic m.,
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tVINT Oi SCmePflON g ; Makeup Pumps 1-1 and 1 2 were inoperable. A fuse was blown in the j
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I CAUST OfSCm P1 oN o@ l, The fuse in the relay cabinet was blown. The exact cause of the blown fooI fuse is not knor.m.
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f TOLEDO EDISON COMPANY DAV4.-BESSE UNIT ONE NUCLFJI POWER. aTION SUPPLEMENTAL INFORMATION FOR LER NP-32-77-14 o-i DATE OF EVENT: August 29, 1977 FACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE: Makeup Pumps 1-1 and 1-2 were inoperable.
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Conditions Prior to Occurrence: The plant was in Mode 3, with Power (MWT) = 0 and Load (MWE) = 0.
Description of Occurrence: On August 29, 1977, at 1225 hours0.0142 days <br />0.34 hours <br />0.00203 weeks <br />4.661125e-4 months <br />, the Control Room operator observed that Makeup Pump 1-2 tripped. He then unsuccessfully attempted to start Makeup Pump 1-1.
Beth Makeup Pumps were inoperable, in violation of Technical Specification 3.1.2.4.
Upon investigation, it was discovered that Makeup Pump 1-2 had tripped due to a blown fuse on Terminal 21R of Relay Cabinet 2825. This fuse supplies 120 V AC to the relay which provides the " Low Level" interlock to trip the pump on low level in the Makeup Tank. This relay,also provides the interlock for Makeup Pump 1-1 and thus it could not be started.
There were no redundant systems available and operable; therefore, E=ergency Procedure EP 1202.15, " Loss of Reactor Coolant Makeup", was initiated isolating Reactor Coolant Makeup, Letdown and Seal Injection. Control rods were inserted to 0% and Abnormal Procedure AB 1203.04, "Depressurization of RCS with only Safety Related Equipment", was initiated.
Designation of Apparent Cause of Occurrence: The fuse supplying 120 V AC to the relay used to provide the interlock for both Makeup Pumps blew. The exact reason for the blown fuse is not known.
Analysis of Occurrence: There was no danger to the health and safety of the public or Station personnel. From 1225 hours0.0142 days <br />0.34 hours <br />0.00203 weeks <br />4.661125e-4 months <br /> to 1335 hours0.0155 days <br />0.371 hours <br />0.00221 weeks <br />5.079675e-4 months <br /> on August 29, 1977, Emergency Procedure EP 1202.15, " Loss of Reactor Coolant Makeup", and Abnormal Procedure AB 1203.04, "Depressurization of RCS with ouly Safety Related Equip-ment", were implemented and would have safely shut down the plant if a Makeup Pump could not have been restored.
Corrective Action: At 1335 hours0.0155 days <br />0.371 hours <br />0.00221 weeks <br />5.079675e-4 months <br /> on August 29, 1977, the fuse was replaced returning Makeup Purps 1-1 and 1-2 to service thus removing the, Station from, the Action State =ent of Technical Specification 3.1.2.4.
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To prevent recurrence, Facility Change Request 77-288 was issued. This requests
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Makeup Pumps inoperable.
Failure Data: No previous similar events have occurred.
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IE FILE COPY TOLECO
%ms EDISON September 12, 1977
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License No. NPF-3 (7
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'K Mr. James G. Keppler
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g Regional Director, Region III
'ai [ t.V Office of Inspection and Enforcement U. S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, Illinois 60137
Dear Mr. Keppler:
Reportable Occurrence NP-32-77-14 Davis-Besse Nuclear Power Station Unit 1 Date of Occurrence: August 29, 1977
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Enclosed find three copies of Licensee Event Report NP-32-77-14 with a su>plemen-
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tal information sheet, which is being submitted in accordance with Technical Specification 6.9 to provide 14 day written notification of the subject cecur-rence.
Yours truly,
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W' t ack Evans Station Superintendent Davis-Besse Nuclear Power Station JGE/JRL/ljk Enclosures cc:
Dr. Ernst Volgenau, Director Office of Inspection and Enforcement Encl: 40 copies Licensee Event Report 40 copies Supplemental Information Sheet Mr. William G. Mcdonald, Director Office of Management
[~'T Information and Program Control (V)
Encl: 3 copies Licensee Event Report
${p ]0 /077 3 copies Supplemental Information Sheet 2 copies Telecopied Report THE TCLEDO EDISCN COMPANY EDISCN PLAZA 300 MADISON AVENUE TOLEDO CHIO 43652 "d$,
LICENSEE E. Er:r REPORT
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DAVIS-BESSE UNIT ONE NUCLEAR POWER STATION SUPPLEMENTAL INFORMATION FOR LER NP-32-77-14
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DATE OF EVENT: August 29, 1977 FACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE: Makeup Pumps 1-1 and 1-2 were inoperable.
Conditions Prior to Occurrence: The plant was in Mode 3, with Power (MWT) = 0 and Load (MWE) = 0.
Description of Occurrence: On August 29, 1977 at 1225 hours0.0142 days <br />0.34 hours <br />0.00203 weeks <br />4.661125e-4 months <br />, the Control Room operator obrerved that Makeup Pump 1-2 tripped. He then unsuccessfully attempted to start Makeup Pump 1-1.
Both Makeup Pumps were inoperable, in violation of Technical Specification 3.1.2.4.
Upon investigation, it was discovered that Makeup Pump 1-2 had tripped due to a blown fuse on Terminal 21R of Relay Cabinet 2825. This fuse supplies 120 V AC to the relay which provides the " Low Level" interlock to trip the pump on low level in the Makeup Tank. This relay also provides the interlock for Makeup Pump 1-1 and thus it could not be started.
d There were no redundant systems available and operable; therefore, E=ergency Procedure EP 1202.15, " Loss of Reactor Coolant Makeup",
as initiated isolating Reactor Coolant Makeup, Letdewn and Seal Injection. Control rods were inserted to 0% and Abnormal Procedure AB 1203.04, "Depressuritation of RCS with only Safety Related Equipment", was initiated.
Designation of Apparent Cause of Occurrence: The fuse supplying 120 V AC to the relay used to provide the interlock for both Makeup Pu=ps blew. The exact reagon for the blown fuse is not known.
Analysis of Occurrence: There was no danger to the health and safety of the public or Station personnel. From 1225 hours0.0142 days <br />0.34 hours <br />0.00203 weeks <br />4.661125e-4 months <br /> to 1335 hours0.0155 days <br />0.371 hours <br />0.00221 weeks <br />5.079675e-4 months <br /> on August 29, 1977, Emergency Procedure EP 1202.15, " Loss of Reactor Coolant Makeup", and Abnormal Procedure AB 1203.04, "Depressuri=ation of RCS with only Safety Related Equip-ment", were implemented and would have safely shut down the plant if a Makeup Pump could not have been restored.
Corrective Action: At 1335 hours0.0155 days <br />0.371 hours <br />0.00221 weeks <br />5.079675e-4 months <br /> on August 29, 1977, the fuse was replaced returning Makeup Pumps 1-1 and 1-2 to service thus removing the Station from
[T the Action Statement of Technical Specification 3.1.2.4.
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'hP-32-77-14 2
i To prevent recurrence, Facility Change Request 77-288 was issued. This requests
. separate circuits for each Makeup Pump to prevent one fuse from rendering both j
Makaup Pumps inoperable.
Failure Data: No previous similar events have occurred.
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