ML19290C286

LER 79-125/03L-0:on 791208,during Surveillance Testing,Decay Heat Cooler 1-1 Component Cooling Water Outlet Valve CC1467 Did Not Stroke from Control Room Switch.Caused by Mechanical Linkage in Valve That Had Vibrated Loose.Design Change Mad

ML19290C286
Person / Time
Site:	Davis Besse
Issue date:	01/05/1980
From:	Eldred D TOLEDO EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19290C284	List: ML19290C283 ML19290C286
References
LER-79-125-03L, LER-79-125-3L, NUDOCS 8001100485
Download: ML19290C286 (2)

Text

U. S. NUCLEAR REGULATORY COMMISSloN NPC F ORE 13SG (7-77 ) .

LICENSEE EVENT REPORT .

(PLE ASE PRINT OR TYPE ALL REQUIRED INFORMATION)

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63 63 EVENT DATE 7 8 60 61 DOCKET NUMBER EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h o 2 l On December 8,1979 at 2300 hours0.0266 days <br />0.639 hours <br />0.0038 weeks <br />8.7515e-4 months <br /> during the performance of surveillance testing, Decay o 3 l Heat (DH) Cooler 1-1 Component Cooling Water (CCW) Outlet Valve CC1467 would not strokp Since the station was in Mode 5, this incident is being o a droatheControlRoomswitch.

The valve was manually opened. ]

O ,, j reported as documentation of a component failure.

There was no danger to the health and safety of the public or station personnel. DH o c l o l 7 ) l Cooler 1-2 was operable at the time of the occurrence. (NP-33-79-145) l l

0 8 l 80 CAUSE COMP. VALVE SYSTE\t CAUSE SUBCODE SUUCODE CODE CODE SU8 CODE CO'.TONENT CODE lalol l C l F j@ y@ l A ]@ l Vl A L] Vl 0l PlQ l D @ lZl@ 13 Ig 19 20 8 9 to it 12 7

REPORT REVISION S EQU E N 'I AL oCCU R R E P.CE

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[gl34 Zlg 33 l3o Zl g 3/ 40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h i o ]The cause of the occurrence was that the mechanical linkage in the valve had vibrated gijijl loose.

This has been determined to be a design problem with the linkage connectin:; ]

l pin of the valve operator. On December 9,1979, a design change was made to the link-]

The linkage connecting pin was locked inj g,;3g l age under the direction of the manufacturer.

l jil4l l place. The valve was declared operable on December 10, 1979. 80 7 8 9

". pot.E R OTHER STATUS DISCOV RY DISCOVERY DESCRIPTION 32 ST S Surveillance Test ST 5074.U1 i 3 gg 0l 0 0lg NA l Blgl l ACTIVITY CO' TENT AMOUNTOF ACTIVITY LOCATION OF RELE ASE RELEASED OF RELE ASE li Ic 8i LzJ @ l10zi@l NA l [D 80 l

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' - David T. Eldred pg y . 419-259-5000, Ext. 237

TOLEDO EDISON COMPANY DAVIS-BESSE NUCLEAR POWER STATION UNIT ONE SUPPLEMENTAL INFORMATION FOR LER NP-33-79-145 DATE OF EVENT: December 8, 1979 FACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE: Decay Heat Cooler 1-1 Component Cooling Water Out-let Valve CC1467 would not stroke from the Control Room.

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

Description of Occurrence: On December 8,1979 at 2300 hours0.0266 days <br />0.639 hours <br />0.0038 weeks <br />8.7515e-4 months <br /> during the performance of Surveillance Test ST 5074.01, Component Cooling Water (CCW) System Monthly Test, Decay Heat Cooler 1-1 CCW Outlet Valve CCl467 would not stroke from the Control Room switch. Technical Specification 3.5.3.c requires one emergency core cooling subsys-tem operable comprised of one operable decay heat cooler in Mode 4. Since the sta-tion was in Mode 5 at the tbne of the occurrence, this incident is being reported as documentation of a component f ailure. The valve was manually opened.

Designation of Apparent Cause of Occurrence: The cause of the occurrence was that the mechanical 1inkage in the valve had vibrated loose. This has been determined to be a design problem with the linkage connecting pin of the valve operator.

Analysis of Occurrence: There was no danger to the health and safety of the public or to station personnel. Decay Heat Cooler 1-2 was operable at the time of the occurrence.

Corrective Action: On December 9,1979 per Facility Change Request 79-347, a design change was made to the linkage under the direction of the manufacturer. The linkage connecting pin was locked in place to prevent a loosening of the linkage from vibra-tion. The valve was declared operable on December 10, 1979 after the successful completion of ST 5074.01.

Failure Data: There have been four previously reported occurrences with failures of this type actuator. They were reported in Licenset Event Reports NP-33-78-120, NP-33-78-147, NP-33-79-74 and NP-33-7 9-ll4.

LER #79-125 1727 296

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