ML20027A431

LER 78-107/03L-0:on 781031,during Performance of ST 508.01, Diesel Generator Monthly Test,On Diesel Generator 1-2 Room Temp Rose to 110 F & Outside Damper Would Not Open.Caused by Damper Linkage Being Out of Adjustment & Bound in Guide

ML20027A431
Person / Time
Site:	Davis Besse
Issue date:	11/27/1978
From:	Hartigan J TOLEDO EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20027A430	List: ML20027A429 ML20027A431
References
LER-78-107-03L, LER-78-107-3L, NUDOCS 7812010213
Download: ML20027A431 (3)

Text

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NEC FCRM 366 U.S. NUCLEAR REGULATORY COMMISSION (7 7h LICENSEE EVENT REPORT (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

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63 69 EVENT DATE 74 75 REPORT DATE 80 7 8 60 61 DOCKET NUMBER EVENT OESCRIPTION AND PROBABLE CONSEQUENCES h l o 12 l l During the conduct of ST 5081.01, Diesel Generator (DG) Monthly Test" on DG l-2, the l ga y3i ; room temperature rose to 1100F. The outside air damper would not open. DG 1-2 was l ga;4ll declared inoperable at 2045 hours0.0237 days <br />0.568 hours <br />0.00338 weeks <br />7.781225e-4 months <br /> on 10/31/78. This placed the unit in the Action l

o;3; l Statement of Technical Specification 3.8.1.1. DG l-1 was operable and would have l io ;g j l been available if offsite power was lost. DG l-2 would start and would hava continuedj

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] g 43 lI l2 l0 l6 l g 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS 27 IslollIt was discovered the damper linkage was out of adjustment and bound in a guide. The l li ii l l linkage was disassembled and readjusted. The damper was stroked six times. I y lST 5081.01 was completed, and Diesel Generator 1-2 declared operable at 2345 hours0.0271 days <br />0.651 hours <br />0.00388 weeks <br />8.922725e-4 months <br /> on l 3 3 joctober 31, 1978. This renoved the unit from the Action Statement of Technical Speci-l i

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7 8 9 10 68 69 so. S DVR 78-161 w .,n,......,o John _P. Hartigan PHONE: 419-259-5000, Ext. 253 {

TOLEDO EDISON COMPANY DAVIS-BESSE UNIT ONE NUCLEAR POWER STATION SUPPLEMENTAL INFORMATION FOR LER NP-33-78-125 DATE OF EVENT: October 31, 1978 FACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE: Inoperable Diesel Generator 1-2 Ventilation Inlet Dampe r Conditions Prior to Occurrence: The unit was in Mode 2, with Power (MRI) = 83 and Load (MWE) = 0.

Description of Occurrence: During the conduct'of ST 5081.01, " Diesel Generator Monthly Test", on Diesel Generator Unit 1-2, the room temperature rose to 1100F, The ventilation fans were on and the damper motor was running but damper HV 5336A would not open.

Diesel Generator 1-2 was declared inoperable at 2045 hours0.0237 days <br />0.568 hours <br />0.00338 weeks <br />7.781225e-4 months <br /> on October 31, 1978.

This placed the unit in the Action Statement of Technical Specification 3.8.1.1, which requires both Diesel Generators to be operable while the unit is in Modes 1, 2, 3 or 4.

'I During the investigation of this failure, it was determined the preventative main-tenance work order 78-2298 had determined the damper would not open on October 26, 1978, but at this time, it was not realized the damper was required for emergency diesel generator long teon operation. A work request was generated by the person-nel performing the preventative maintenance.

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b Designation of Apparent Cause of Occurrence: Under Maintenance Work Order 78-1426-42, damper HV 5336A was inspected, and it was discovered the linkage was out of adjustment and bound in a guide.

Analysis of Occurrence: There was no danger to the health and safety of the public l

or to unit personnel. Diesel Generator 1-1 was operable and would have been availa-ble if offsite power was lost. Diesel Generator 1-2 would start and would have e

continued to function for an undetermined amount of time.

Corrective Action: The linkage was disassembled and readjusted. The damper was stroked six times to verify proper operation. Surveillance Test ST 5081.01 was completed and Diesel Generator 1-2 declared operable at 2345 hours0.0271 days <br />0.651 hours <br />0.00388 weeks <br />8.922725e-4 months <br /> on October 31, 1978. This removed the unit from the Action Statement of Technical Specification

3. 8.1.1. -

LER #78-107

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4 TOLEDO EDISON COMPA!N DAVIS-BESSE UNIT ONE NUCLEAR POWER STATION SUPPLEMENTAL INFORMATION FOR LER NP-33-78-125 PAGE 2 Maintenance Work Order 78-2643 was issued to inspect the linkage on inlet damper HV 5329A to Diesel Generator Room 1-1 Ventilation Fan. There has been a preven-tative maintenance schedule to inspect the operation of the dampers on a bi-monthly basis. At this time, it is felt that this frequency is adequate.

A copy of this report will be routed to all Shif t Foremen and Maintenance supervisory personnel so it is realized these dampers are required for emergency diesel generator operability. .

Failure Data: There have been no previously reportable failures of the Diesel Generator Room Ventilation Dampers.

LER #78-107 t

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