05000346/LER-1980-070-03, /03L-0:on 800828,during Weekly Diesel Fuel Pump Test ST 5016.01,diesel Fuel Pump Failed to Start at Required 95 Psig.Caused by Broken Pressure Switch.Switch Repaired & Recalibrated

/03L-0:on 800828,during Weekly Diesel Fuel Pump Test ST 5016.01,diesel Fuel Pump Failed to Start at Required 95 Psig.Caused by Broken Pressure Switch.Switch Repaired & Recalibrated

ML19338F052
Person / Time
Site:	Davis Besse
Issue date:	10/03/1980
From:	Frohne R TOLEDO EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19338F048	List: 05000346/LER-1980-070, Forwards LER 80-070/03L-0 05000346/LER-1980-070-03, /03L-0:on 800828,during Weekly Diesel Fuel Pump Test ST 5016.01,diesel Fuel Pump Failed to Start at Required 95 Psig.Caused by Broken Pressure Switch.Switch Repaired & Recalibrated
References
LER-80-070-03L, LER-80-70-3L, NUDOCS 8010070458
Download: ML19338F052 (3)

LER-1980-070, /03L-0:on 800828,during Weekly Diesel Fuel Pump Test ST 5016.01,diesel Fuel Pump Failed to Start at Required 95 Psig.Caused by Broken Pressure Switch.Switch Repaired & Recalibrated

Event date:
Report date:
3461980070R03 - NRC Website

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NT.C FORM 3G6 SPECIAL REPORT U. S. NUCLEAR REGULATORY CoMMISSloN ep, j

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60 61 DOCKET NUMBER 68 6'J EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND FROBAOLE CONSEQUENCES h lol2j l (NP-33-80-78) On 8/28/80 during the weekly Diesel Fire Pump (DFP) Test, ST 5016.01, l

g l the DFP failed to start at the required pressure of 95 psig.

During tests in the l

ITT71 i following weeks, the problem recurred.

In the above cases, the pump would run but wasl g,3l l technically inoperable because it would not auto start at the required pressure. The l

je l l station had entered the action statement of T.S. 3.7.9.1.

There was no danger to the l [TT71 1 Public or station personnel. The Electric Fire Pump was operable.

Because the prob- [

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40 di 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS g l Af ter the first occurrence the cause was explained as a broken pressure switch.

Underl 1 MWO IC-606-80, the switch was repaired and recalibrated. The switch has been recali-I 1

p TTI I brated three additional times when the problem recurred each week up until 9/20/80.

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SPECIAL REPORT TOLEDO EDISON COMPANY

' DAVIS-BESSE NUCLEAR POWER STATION UNIT ONE SUPPLEMENTAL INFORMATION FOR LER NP-33-80-78 DATE OF EVENT: August 28, 1980 FACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE:

Diesel Fire Pump would not start at required pressure Conditions Prior to Occurrence: The unit was in Mode 5 with Power (MWT) = 0 and Load (Gross MWE) = 0.

Description of Occurrence: On August 28, 1980 at OC;$ Tours during the performance of the Diesel Fire Protection System Pump Weekly Test, ST 5016.01, the Diesel Fire Pump failed to start at the proper fire water header pressur'. The required decreasing e

starting pressure is 95 psig but the pump did not start until the pressure had dropped to 64 psig.

A check of the pressure switch revealed that it was broken. The pump was declared inoperable. The station had entered the action statement of Technical Speci-fication 3.7.9.1.

This requires two high pressure pumps to be operable in all modes.

Action Statement (a) requires the pump to be restored to operable status within 7 days or in lieu of any other report required by Technical Specification 6.9.1, submit a Special Report within the next 30 days outlining the plans and procedures to be used to provide for the loss of redundancy la this,sytem. This is not a mode restraint.

Hewever, on September 4, 1980 at 0700 hours0.0081 days <br />0.194 hours <br />0.00116 weeks <br />2.6635e-4 months <br />, during the next weekly run of ST 5016.01, the same problem was encountered. This. time the Diesel Fire Pump did not start until the pressure had dropped to 85 psig. The diesel was placed in standby but was tzchnically inoperable due to the problem with the starting pressure.

Again on September 18, 1980 the pump would not start until the pressure had dropped to 90 psig.

It was placed in standby.

In all of the above cases the Diesel Fire Pump could be operated but was inoperable because it would not auto start at 95 psig.

Breause the problem was not corrected in the first seven days, these events are being submitted as a Special Report per Tec'anical Specification 6.9.2.

Designation of Apparent Cause of Occurrence: The failure to start at the required pres-cure in the first event appeared to be due to a damaged pressure switch which had been accidentally bumped.

Ir as repaired and recalibrated. However, when the problem repeated it was apparent there was more involved.

The switch has since been recalibrated three additional times and the problem recurred u, until September 20, 1980.

Investiga-tion is continuing to find the sources of the problem.

Corrective Ac; ton: Under Maintenance Work Order IC-606-80 the first event was corrected by replacing c broken glass and recalibration of the pressure switch.

ST 5016.01 was successfully performed on August 30, 1980. The diesel fire pump was declared operable.

LER #80-070

SPECIAL REPORT TOLEDO EDISON COMPANY DAVIS-BESSE NUCLEAR POWER STATION UNIT ONE PAGE 2 SUPPLEMENTAL > INFORMATION FOR LER NP-33-80-78 When the problem recurred during the next weekly test run, Maintenance Work Order IC-615-80 was issued and again the pressure switch was recalibrated. On September 13, 1980 under Maintenance Work Order 80-3196, a problem in the starting relay was corrected by replacing the AC2 coil.

ST 5016.01 was again successfully performed, and the Diesel Fire Pump was declared operable. When the problem recurred on September 18, 1980, the switch was again recalibrated. On September 20, 1980,. the Diesel Fire Pump was declared operable.

A maintenance electrician will accompany the operator for the upcoming weekly surveil-lance tests on the Diesel Fire Pump to oversee the starting sequence and look for any cdverse conditions.

Failure Data: Previous failures of the Diesel Fire Pump were reported in Lt.censee Event Reports NP-33-78-52 (78-042), NP-33-78-68 (78-034), and NP-33-80-30 (30-021).

LER #80-070 1

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