05000346/LER-1981-002-03, /03L-0:on 810102,reactor Coolant Pump 1-2 Was Shutdown Due to High Seal Return Temp & Deteriorating Seal Staging & on 810106,pump 2-1 Was Shutdown for Deteriorating Seal Staging.Caused by Seal Degradation.Seals Replaced

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/03L-0:on 810102,reactor Coolant Pump 1-2 Was Shutdown Due to High Seal Return Temp & Deteriorating Seal Staging & on 810106,pump 2-1 Was Shutdown for Deteriorating Seal Staging.Caused by Seal Degradation.Seals Replaced
ML20003A990
Person / Time
Site: Davis Besse 
Issue date: 02/02/1981
From: Syslo J
TOLEDO EDISON CO.
To:
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20003A987 List:
References
LER-81-002-03L, LER-81-2-3L, NUDOCS 8102100159
Download: ML20003A990 (2)
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LER-1981-002, /03L-0:on 810102,reactor Coolant Pump 1-2 Was Shutdown Due to High Seal Return Temp & Deteriorating Seal Staging & on 810106,pump 2-1 Was Shutdown for Deteriorating Seal Staging.Caused by Seal Degradation.Seals Replaced
Event date:
Report date:
3461981002R03 - NRC Website
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text

LICENSEE EVENT REPORT

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60 el DOCK ET NUVSER tid 4,9 EVENT 0 ATE 74 7S REPORT OATE 80 EVENT DESCRIPTION AND PROB ABLE CONSEQUENCES h o 2 l(NP-33-81-01) on 1/2/81 at 1938 hours0.0224 days <br />0.538 hours <br />0.0032 weeks <br />7.37409e-4 months <br />, Reactor Coolant Pump (RCP) 1-2 was shutdown due!

ITTT1 Ito high seal return temperature t.nd deteriorating seal staging. The high flux and l

g l flux / delta flux / flow trip setpoints were reset per T.S. 3.4.1.

On 1/6/81 at 0730 hour0.00845 days <br />0.203 hours <br />0.00121 weeks <br />2.77765e-4 months <br /> 4 iog,,y lRCP 2-1 was shutdown due to deteriorated seal staging. The turbine / generator was l

oe ltripped, and the reactor shutdown. The plant entered Mode 3 at 0803 hours0.00929 days <br />0.223 hours <br />0.00133 weeks <br />3.055415e-4 months <br /> in compli-1 o 7 lance with T.S. 3.0.3.

There was no danger to the health and safety of the public or I

[ o g a 1 lto station personnel.

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g lThe cause was the shutdown of reactor co_olant pumps due to seal degradation.

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TOLEDO EDISON COMPANY DAVIS-BESSE NUCLEAR POWER STATION UNIT ONE SUPPLEMENTAL INFORMATION FOR LER NP-33-81-01 DATE OF EVENT: January 2, 1981 FACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE: Controlled Shutdown of Reactor Coolant Pumps 1-2 and 2-1 Dua to Seal Degradation Conditions Prior to Occurrence: The unit was in Mode 1, with Power (MRT) = 1525 and.

Load (Gross MWE) = 495 Description of Occurrence: On January 2,1981 at 1938 hours0.0224 days <br />0.538 hours <br />0.0032 weeks <br />7.37409e-4 months <br />, control room operators shutdown Reactor Coolant Pump (RCP) 1-2 due to a high seal return temperature of 1700F and deteriorating seal staging. The station was running at a reduced power level.

Instrument and Control personnel reset the hi flux and the flux / delta flux / flow set-points to 78.5 percent rated. thermal power as required by Technical Specification 3.4.1.

The action statement requires that in Mode 1, with one pump not in operation, power operation may proceed provided thermal power is restricted to less than 80.2 percent of rated thermal power and within 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> the setpoints for the high flux and the flux / delta flux /fl'>w trips be reduced.

On January 6,1981 at 0730 hours0.00845 days <br />0.203 hours <br />0.00121 weeks <br />2.77765e-4 months <br />, control room operators shutdown RCP 2-1 due to deteriorated seal staging. Reactor power had been reduced to 15 percent prior. to tripping the pump. Following the pump trip, the turbine / generator was tripped, and the reactor shutdown. The plant entered Mode 3 at 0803 hours0.00929 days <br />0.223 hours <br />0.00133 weeks <br />3.055415e-4 months <br /> in compliance with Tech-nical Specification 3.0.3.

Designation of Apparent Cause of Occurrer.ce: The cause of the occurrence was the con-trolled shutdown of RCPs for repairs. The pumps were shutdown to prevent further degradation of the seals.

Analysis of Occurrence: There was no danger to the health and safety of the public or to station personnel. The reactor was shutdown, placing it in a safe condition.

l

Corrective Action

Under Maintenance Work Orders 80-4162 and 80-4163, the mechanical seals were replaced.

Toledo Edison Company and Byron Jackson, the seal vendor, are investigating the cause of the seal failure.

i iled s1<qy ur.s of a reactor coolant pump were 5

Failure Data: Three previous et~

reported in Licensee Event Reposta NP-33 '.9 A'

7" 044), NP-33-79-120 (79-103) and NP-32-80-03 (80-019),

LER #81-002

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