05000346/LER-1980-003-03, /03L-0:on 800103,during Auxiliary Feedwater Pump Test,Pump l-1 Was Declared Inoperable.Caused by Improperly Adjusted Slip Clutch Between Governor Manual Speed Adjustment Shaft & Remotely Controlled Speed Changer Motion
| ML19257D456 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 01/30/1980 |
| From: | Thompson T TOLEDO EDISON CO. |
| To: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| Shared Package | |
| ML19257D454 | List: |
| References | |
| LER-80-003-03L, LER-80-3-3L, NUDOCS 8002040428 | |
| Download: ML19257D456 (3) | |
| Event date: | |
|---|---|
| Report date: | |
| 3461980003R03 - NRC Website | |
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NHCFonM:0G U. S. NUCLEAR REGULATORY COMMISSION (7 77)
LICENSEE EVENT REPORT CONTROL stock: ]
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60 61 OOOK ET NV.'3 E a t>J b3 EVENT DATE 74 75 REPORT DATE SJ EVENT DESCRIPTION AND PRC8 ASLE CONSCQUENCES h o
2 On January 3,1980 during the performance of Auxiliary Feedwater Pump Test ST 5071.01,l l problems were encountered with the turbine governor. Auxiliary Feedwater Pump 1-1 wasl o
3 l declared inoperable. The unit entered the action statement of Technical Specificationj o
l 3.7.1.2 which requires the inoperable pump be made operable within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> or be in j
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O c l hot shutdown within the next 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />. There was no danger to the health and safety l
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40 41 42 43 44 47 CAUSE C,ESCRIPTION AND CORRECTIVE ACTICNS h ol lThe cause was an improperly adjusted slip clutch installed between the governor manual jijij speed adjustment shaft and a remotely controlled speed changer motor.
There was also l a burr on the high speed stop pin.
Under Maintenance Work Order 80-1224, the correc-ITTTI I tions were made.
ST 5071.01 was successfully performed at 2300 hours0.0266 days <br />0.639 hours <br />0.0038 weeks <br />8.7515e-4 months <br /> un 1/5/80.
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l preventive maintenance procedure MI-M-95 has been written to periodically inspect the j i
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TOLEDO EDISON COMPANI DAVIS-BESSE NUCLEAR POWER STATION UNIT ONE SUPPLEMENTAL INFORMATION FOR LER NP-33-80-02 DATE OF EVENT: January 3, 1980 FACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE: Auxiliary Feed Pump 1-1 inoperable Conditions Prior to Occurrence: The unit was in Mode 3, with Power (MRT) = 0, and Load (Gross MWE) = 0.
Description of Occurrence: At 2230 hours0.0258 days <br />0.619 hours <br />0.00369 weeks <br />8.48515e-4 months <br /> on January 3, 1980 during performance of Auxiliary Feed Pump 1-1 Surveillance Test ST 5071.01, problems were encountered with the turbine governor for Auxiliary Feed Pump 1-1.
It stuck at 3400 RPM.
Due to inability to raise turbine speed to correspond with the high speed stop settings of.the governor, the pump was declared inoperable.
This placed the unit in the Action Statement of Technical Specification 3.7.1.2 which requires that with one pump inoperable, the inoperable pump must be repaired within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> or the unit must be in hot shutdown within the next 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />. Tech-nical Specification 3.7.1.2 requires operability of both Auxiliary Feed Pumps while in Modes 1, 2, and 3.
Designation of Apparent Cause of Occurrence: The cause of this occurrence was determined by station personnel and a Woodward Governor representative to be failure to readjust the slip clutch mechanism to compensate for normal wear. The slip clutch is installed between the governor manual speed adjustment shaf t and a remotely controlled speed changer motor, and protects the speed changer motor from overheating when the governor's mechanical high speed stop prevents further manual speed adjustment shaf t rotation.
In addition, a burr was present on the high speed stop pin which caused the pin to hang up prior to reaching the high speed stop position. This burr added further resistance to the slip clutch, and the clutch slipped prematurely.
Analysis of Occurrence: There was no danger to the health and safety of the public or to station personnel. Auxiliary Feed Pump 1-2 was operable during the inopera-bility of Auxiliary Feed Pump 1-1.
Corrective Action
On January 4, 1980 under Maintenance Work Order 80-1224 the slip clutch was properly tensioned, and the small burr on the high speed stop pin was removed. The Auxiliary Feed Pump 1-1 Test ST 5071.01 was successfully completed, and the system declared operable at 2300 hours0.0266 days <br />0.639 hours <br />0.0038 weeks <br />8.7515e-4 months <br /> on January 5, 1980. This removed the unit from the action statement.
A preventive maintenance instruction MI-M-95 was written and a preventive maintenance work order will be initiated to ensure the slip clutch for the speed changer motor is periodically inspected and properly adjusted.
LER 80-003 186u6 124
TOLEDO EDISON CCMPANY DAVIS-BESSE NUCLEAR POWER STATION UNIT ONE PAGE 2 SUPPLEMENTAL INFORMATION FOR LER NP-33-80-02 Failure Data: Licensee Event Reports NP-33-77-61 and NP-33--77-110 involved gover-nor mechanical problems, although neither specifically addressed the problems encountered in this instance.
LER 80-003 1866i25