ML20009A903

LER 81-032/03L-0:on 810604,relay Status Lamp 302A Did Not Change State When Trip Signal Was Applied.Caused by Failed Relay Driver Card in Steam & Feedwater Rupture Control Sys Channel 2.Relay Driver Board Replaced

ML20009A903
Person / Time
Site:	Davis Besse
Issue date:	07/01/1981
From:	Trautman D TOLEDO EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20009A895	List: ML20009A894 ML20009A903
References
LER-81-032-03L, NUDOCS 8107140441
Download: ML20009A903 (2)

Text

U. S. NUCLE AR REGULATORY COMMISSION I NRC FORM 16

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<? 3 60 61 EVENT DESCRIPTION AND PROB ABLE CONSEQUENCES h foTO l(NP-33-81-40) At 1410 hours0.0163 days <br />0.392 hours <br />0.00233 weeks <br />5.36505e-4 months <br /> during the performance of ST 5031.14, it was noted that thel l relay status lamp 302A did not change state when a trip signal was applied. As a resulat t o ;3 ;

g o 6 4 ) lthe trip output to AF 599 (auxiliary feedwater discharge to Steam Generator 2) from thEi I o I s 1 ISteam and Feedwater Rupture Control System (SFRCS) Channel 2 was inoperable. This l

ITITI lplaced the unit in the action statement of Technical Specification 3.3.2.2. There was l

, l o l 7 l lno danger. to the health and safety of the public c" station personnel. SFRCS C'iannels l t

. ioisil1/3 and Auxiliary Feedwater Train 1 were operable. l l 80 CAUSE COMP. VALVE SYSTEM CAUSE SU8 CODE CCMPONENT CODE SUSCODE SU8 CODE CODE CODE

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS li l o l iThe cause was determined to be a failed relay driver card in SFRCS Channel 2. Under l l

U_Li_J IMWO IC-458-31. the defective relay driver board was replaced. The channel was declared!

i 2 loperable on 6/4/81 at 2240 hours0.0259 days <br />0.622 hours <br />0.0037 weeks <br />8.5232e-4 months <br />. The defective relay driver board will be tested to I g idetermine the failed component. _

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, 7 8 9 OTHER STATUS IS O RY DISCOVERY DESCRIPTION A  % POWER NA (_B_j@l During performance of ST 5031.14 l l

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r TOLEDO EDISON COMPANY DAVIS-BESSE NUCLEAR POWER STATION UNIT ONE SUPPLEMENTAL INFORMATION FOR LER NP-33-81-40 DATE OF EVENT: June 4, 1981 FACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE:

Inoperable trip output to AF 599 (auxiliary feed-water discharge to Steam Generator 2) from Steam and Feedwater Rupture Control System (SFRCS) Channel 2 during performance of ST 5031.14 Section 6.3 Conditions Prior to Occurrence: The unit was in Mode 1 with Power (MWT) = 2046 and Load ICross MWE) = 669 Description of Occurrence:

On June 4, 1981 at approximately 1410 hours0.0163 days <br />0.392 hours <br />0.00233 weeks <br />5.36505e-4 months <br /> during the performance of ST 5031.14, SFRCS Mcnthly Functional Test, Section 6.3, it was noted that the relay status lamn 302A did not change state when a trip signal was applied.

The above mentioned relay status lamp determines the trip status of an open signal to AF 59,9 (auxiliary feeawater discharge to Steam Generator 2) from SFRCS Channel 2.

This would have prevented AF 599 from receiving an open signal had it first received a close signal on a double ended main steam line break followed by a repressurization of Steam Generator 2. This placed the unit in the action statement of Technical Specification 3.3.2.2 which required the inoperable channel to be Theplaced in the unit was in Mode 1 tripped condition within one hour while in Modes 1, 2, and 3.Af ter what was initially dete i

at the time of the occurrence.

testing performed, the channel was declared operable, however, further evaluation of the necessary repairs led to the conclusion that the testing requirements were not adequate. The channel was again declared inoperable to perform response time testing.

Upon satisfactory completion of response time testing, the channel was declared opera-ble.

Designation of Apparent Cause of Occurrence: The apparent cause of the occurrence was determined to be a failed relay driver card in SFRCS Channel 2.

Analysis of Occurrence:

There was no danger to the health and safety of thIe public or to station personnel. SFRCS Channels 1/3 and Auxiliary Feedwater Train 1 were operabic at the time of the occurrence.

Corrective Action: Maintenance Work Order IC-458-81 was issued to investigate in

_which case it was found that Relay Driver Board (P/N GN177) location The SFRCS 2-1 was Monthly defec-Functional tive. The defective relay driver board was replaced. The channel was declared Test was again performed for this channel satisfactorily.The defective relay driver board will be operable on June 4,1981 at 2240 hours0.0259 days <br />0.622 hours <br />0.0037 weeks <br />8.5232e-4 months <br />.

tested to determine the failed component.

Failure Data:

There have been no previous failures of this type.

LER # 81-032 - ---- , . . _ .