ML19329B855

RO NP-32-77-14:on 770829,makeup Pumps 1-1 & 1-2 Determined Inoperable.Caused by Blown Relay Fuse.Fuse Replaced & Pumps Returned to Svc

ML19329B855
Person / Time
Site:	Davis Besse
Issue date:	09/12/1977
From:	Borysiak M, Lingenfelter J TOLEDO EDISON CO.
To:
Shared Package
ML19329B856	List: ML19329B855
References
NUDOCS 8002060863
Download: ML19329B855 (3)

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tVINT Oi SCmePflON g ; Makeup Pumps 1-1 and 1 2 were inoperable. A fuse was blown in the

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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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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 separate circuits for each Makeup Pump to prevent one fuse from rendering both i Makeup Pumps inoperable.

Failure Data: No previous similar events have occurred.

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%ms EDISON September 12, 1977 ,7.'

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Docket No. 50-346 3 4' O '

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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

,m Enclosed find three copies of Licensee Event Report NP-32-77-14 with a su>plemen-

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h 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 3 copies Supplemental Information Sheet ${p ]0 /077 2 copies Telecopied Report THE TCLEDO EDISCN COMPANY EDISCN PLAZA 300 MADISON AVENUE TOLEDO CHIO 43652 "d$ ,

LICENSEE E . Er:r REPORT

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SUPPLEMENTAL INFORMATION FOR LER NP-32-77-14 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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