05000346/LER-1978-004-03, /03L-0:on 780105,inlet Balancing Dampers to Emergency Ventilation Sys Fans 1-1 & 1-2 Found Closed.Cause Unknown.Dampers Returned to Balance Position & Locknut Tightened

/03L-0:on 780105,inlet Balancing Dampers to Emergency Ventilation Sys Fans 1-1 & 1-2 Found Closed.Cause Unknown.Dampers Returned to Balance Position & Locknut Tightened

ML19326A188
Person / Time
Site:	Davis Besse
Issue date:	01/31/1978
From:	Alten B TOLEDO EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19326A184	List: 05000346/LER-1978-004, Forwards LER 78-004/03L-0 05000346/LER-1978-004-03, /03L-0:on 780105,inlet Balancing Dampers to Emergency Ventilation Sys Fans 1-1 & 1-2 Found Closed.Cause Unknown.Dampers Returned to Balance Position & Locknut Tightened
References
LER-78-004-03L, LER-78-4-3L, NUDOCS 8002030051
Download: ML19326A188 (2)

LER-1978-004, /03L-0:on 780105,inlet Balancing Dampers to Emergency Ventilation Sys Fans 1-1 & 1-2 Found Closed.Cause Unknown.Dampers Returned to Balance Position & Locknut Tightened

Event date:
Report date:
3461978004R03 - NRC Website

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SUPPLE:-D'n Aij:::'00:ATN"! FOR LE: ::P-33-70 -3S DATE OF T_VT. :T: January 3, 1970

' FACILITY: Davis-Eesse Unit 1.

IDENTIFICATION OF OCCURRE!!CE: Emergency Ventilation System (EVS) Fans 1-1 and 1-2 Inlet Balancing Dampars Closed Cond ition.4 Prior to Occurrence: The unit was in Mode 3, with Potaer (MCE) = 0, and Load (MWE) = 0.

- Description of occurrence: At 1500 hours0.0174 days <br />0.417 hours <br />0.00248 weeks <br />5.7075e-4 months <br /> on January 5,1978, the inlet balancing dampers-to EVS Fans 1-1 and 1-2 (CV 69 and CV 73) were found closed.

Rich thcac dampers closed, the EVS could not draw down the annulus af ter a locs of coolant

- accident. This placed the uni: in e:: cess of tha Action Statt: tant of Technical Specification 3.6.5.1 chich rcepires two indenendanc LV3 in node: 1, 2, 3 and 4 Lluitir.c Cundicion rer Cperacion 3.0.3 was, theref ere, applicable.aich requires

'the unic ro La in ?!ada 3, :10: Stcadby, trithia one hour. The unic ras in ::adu 3 at the t* o of tSc c:curre,cs. Tha d,rpars ssrc irmouietely re-op:ncd :c thu g.

E,csttien mu hed *.'n the ductuari,, to r,1va tha fan _the rated flo.>.

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Desinnation of Apparent Cause of Occurrence: Even though the exact cause is not known, the dampers were procaoly closed by some unknown person.

Since the lock-nuts that hold the damper in position were tight and the dampers could not be re-opened without looser.ing the locknuts, there is little possibility that thcoe

~ dampers vibrated shut.

Analysis of Gecurrence:.There was no danger to the health and safety of the public or to unit personnel. No incident. requiring EVS occurred during taa time that the

' dampers were closed.

Corrective Action: The dampers were returned to the balance position and the locknut tightened. These darpers are checked as part of a monthly preventive maintenance schedule, andiclosure of these dampers would show'up on the monthly surveillance test as a;zero or extremely low flow condition.

This incident will be distributed to Maintenance ani Inntrunent and Control

- personnel for raquired reading.

7511ure Data: 1There have been no previous sinflar tecurrences.

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