ML19351G361

LER 81-006/03L-0:on 810119,power Lost to Safety Features Actuation Sys Channel 1 Cabinet.Caused by Blown Supply Fuse from Panel Y-1 Due to Procedure Deficiency.Fuse Replaced & Procedure Modified

ML19351G361
Person / Time
Site:	Davis Besse
Issue date:	02/13/1981
From:	Isley T TOLEDO EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19351G357	List: ML19351G356 ML19351G361
References
LER-81-006-03L, LER-81-6-3L, NUDOCS 8102230582
Download: ML19351G361 (2)

Text

U. S. NUCLE AR HEGULATORY COMMISSION NRC FsRM 360. ,

(7 77)

LICENSEE EVENT REPORT (PLE ASE PRINT OR TYPE ALL REQUIRED INFORMATION)

CONTROL BLOCK: l 1

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I 8 60 61 DOCKET NUMBE R EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h lo l2l 1 (NP-33-81-05) On 1/19/81 at 1550 hours0.0179 days <br />0.431 hours <br />0.00256 weeks <br />5.89775e-4 months <br /> during the performance of the Safety Features l go 33; l Actuation System (SFAS) Grounding Test, TP 520.02, power was lost to the SFAS Channel l lo l4 l l 1 cabinet. This made the SFAS Channel 1 containment radiation inoperable. The unit l lo l3) l entered Action Statement 9 of T.S. 3.3.2.1 which was satisfied since the containment I lo Is l I bistable tripped upon loss of power. There was no danger to the health and safety ofl l

10 l 71 l the public or station personnel. The remaining three channels were operable during l

Io!a] I this time. 80 DE CODE SUB E COMPONENT CODE SLBCODE S ODE Q lI lB l@ ]@ l Zl@ l Z l Zl Z l Z l Z l Z l@ y@ lZ l @

12 13 18 19 20 7 8 9 80 11 REVIS80N SEQUEN TI AL OCCURRENCE REPORT REPORT NO. CODE TYPE N O.

EVENT YEAR LERfRO O,aggg 18111 l-J 23 l e l e l 61 24 26 Lc.]

27 18131 2d 29 Lil Ju L-J 31 L8J 32_

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42 43 44 4; CAUSE DESCRIPTION AND CORRECTIVE ACTIONS li j o l l The cause was the lack of proper warning in procedure TP 520.02 and the vendor's test l lijijl outline. Instrument and Controls personnel were installing a iumper between terminal 1 I

, 7 l 12 of 7 !121 and instrument ground. In the attempt, an arc occurred, and the supply l

f [TTi'l I fuse from panel Y-1 blew. The procedure did not contain a warning that terminal 12 was the 118 VAC supply to the SFAS cabinet. Mod T-5361 was written to the procedure.

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^ OTHER STATUS dis O RY DISCOVERY 0ESCRIPTION

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TOLEDO EDISON COMPANY UDAVIS-BESSE NUCLEAR POWER STATION UNIT ONE SUPPLEMENTAL INFORMATION FOR LER NP-33-81-05 DATE OF EVENT: January 19, 1981 FACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE: Loss of power to Safety Features Actuation System (SFAS) Channel 1.

3 Conditions Prior to Occurrence: The unit was in Mode 5 with Power (MWT) = 0 and l Load (Gross MWE) = 0.

Description of Occurrence: On January 19, 1981 at 1550 hours0.0179 days <br />0.431 hours <br />0.00256 weeks <br />5.89775e-4 months <br />, during the performance of the SEAS Grounding Test, TP 520.02, power was lost to SFAS Channel 1 cabinet. This j made SFAS Channel l containment radiation inoperable. This placed the unit in.the

Action Statement 9 of Technical Specification 3.3.2.1, which required the inoperable '

unit to be placed in the tripped condition within one hour. The containment radiation bistable trips upon loss of pcwer.

i j

j Designation of Apparent Cause of Occurrence: Instrument and Control personnel were ,

installing a j umper between terminal- 12 of TB121 and instrument ground. - When the j jumper was installed, an arc occurred, and the supply fuse from panel Y-1 blew. The

cause of the event was a proced 33 deficiency. The test procedure, TP 520.02-and Con-3 solidated Controls Corporation test outline did not give any warning that terminal 12 was the 118 VAC supply to the SFAS cabinet.

Analysis of Occurrence: There was no danger to the-bealth-and safety of the public or

! to station personnel. The remaining three channels of SEAS containment radiation were *

[

operable during this time. _

i j Corrective Action: The fuse was replaced under Maintenance Work Order 81-1356 and 1 power was restored at 1710 hours0.0198 days <br />0.475 hours <br />0.00283 weeks <br />6.50655e-4 months <br /> the same day. Temporary modification T-5361 was 1 written to TP 520.02 to provide adequate warning.

Failure Data: A similar occurrence in which a procedure deficiency caused a loss of an SEAS channel was reported in Licensee Event-Report NP-33-80-59.

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LER #81-006 .

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