05000346/LER-1980-019-01, /01T-0:on 800325 Reactor Flux/Flow Trip Setpoints Were Not Verified to Be Properly Reset within 4-h of Manual Shutdown of Rcp.Caused by Attention Given to Feedwater Swings.Trip Setpoints Verified Later

/01T-0:on 800325 Reactor Flux/Flow Trip Setpoints Were Not Verified to Be Properly Reset within 4-h of Manual Shutdown of Rcp.Caused by Attention Given to Feedwater Swings.Trip Setpoints Verified Later

ML19309D752
Person / Time
Site:	Davis Besse
Issue date:	04/03/1980
From:	Kocis R, Stotz J TOLEDO EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19309D750	List: 05000346/LER-1980-019, Forwards LER 80-019/01T-0 05000346/LER-1980-019-01, /01T-0:on 800325 Reactor Flux/Flow Trip Setpoints Were Not Verified to Be Properly Reset within 4-h of Manual Shutdown of Rcp.Caused by Attention Given to Feedwater Swings.Trip Setpoints Verified Later
References
LER-80-019-01T, LER-80-19-1T, NUDOCS 8004110386
Download: ML19309D752 (3)

LER-1980-019, /01T-0:on 800325 Reactor Flux/Flow Trip Setpoints Were Not Verified to Be Properly Reset within 4-h of Manual Shutdown of Rcp.Caused by Attention Given to Feedwater Swings.Trip Setpoints Verified Later

Event date:
Report date:
3461980019R01 - NRC Website

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60 61 DOCKET NUV8E R 68 69 EVENT OATE 14 75 REPORT DATE 80 EVENT OESCRIPTION AND PROBABLE CONSEQUENCES h f5771 1(NP-32-80-03) On 3/25/80 at 1720 hours0.0199 days <br />0.478 hours <br />0.00284 weeks <br />6.5446e-4 months <br />, the T.S. 3.4.1 (2.2.1) action statement dead-I lline passed before the Reactor Protection System (RPS) flux /d flux / flow trip setpointsl o 3 lo l4 l lcould be verified to be properly reset as required following the manual shutdown of a i f6TTI Ireactor coolant pump.

On 3/25/80 this event was determined to be immediately reporta-l 0 6 lble under T.S.

6.9.1.8.b.

There was no danger to the public or station personnel. Thel lo l 7 l lRPS did automatically reset the trip bistables to reflect the change to three pump o a loperation. The settings were out of tolerance by less than 1%.

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31 40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h [TlT] lThe cause of this occurrence is attributed to a combination of events.

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At 1940 hours0.0225 days <br />0.539 hours <br />0.00321 weeks <br />7.3817e-4 months <br />, setpoint readjustments were completed. A l

, 7 l Technical Specification change will become effective with the new fuel load which l

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{n80-047 NAME OF PREPARER Robert Kocis and Jan Stotz 419-259-5000, Ext. 296 atgd PHONE:

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TOLEDO EDISON COMPANY DAVIS-BESSE NUCLEAR' POWER STATION UNIT ONE SUPPLEMENTAL INFORMATION FOR LER NP-32-80-03 DATE OF EVENT:

l larch 25, 1980 FACILITY: Davis-Besse Unit 1 Action Statement verification of flux O flux flow IDENTIFICATION OF OCCURRENCE:

was not completed within four hours of manual shutdown of a reactor coolant pump The unit was in Mode 1, with Power (MRT) = 1800, Conditions Prior to Occurrence:

end Load (Gross MWE) = 600.

On March 23, 1980 at 1720 hours0.0199 days <br />0.478 hours <br />0.00284 weeks <br />6.5446e-4 months <br />, the Technical Specifica-Description of Occurrence:

action statement deadline passed before the Reactor Protection Sys-tion 3. 4.1 (2. 2.1) tem (RPS) flux / delta flux / flow trip setpoints could be verified to be properly reset.

This verification was necessary following the manual shutdown of Reactor Coolant Pump When the RPS setpoint was checked (RCP) 1-1 which was experiencing seal problems.

it verified that there had been an automatic reset of the flux / delta per ST 5030.18, This flux / flow trip setpoints. However, the reset was slightly non-conservative.

required a readjustment which was not completed until 1940 hours0.0225 days <br />0.539 hours <br />0.00321 weeks <br />7.3817e-4 months <br /> on March 23, 1980.

This meant the station had operated for two hours and twenty minutes beyond action statement deadline with a trip setpoint for a limiting condition for operation slightly non-conservative.

On March 25, 1980, this event was determined to be immediately reportable under Techni-cal Specification 6.9.1.8.b as the operation of the unit with a parameter or operation subject to a limitingcondition for operation less conservative than the 1 cast conser-vative aspect of the limiting condition for operation established in the technical specification.

Verbal notification was made to Luis Reyes (NRC on-site inspector) at 1130 hours0.0131 days <br />0.314 hours <br />0.00187 weeks <br />4.29965e-4 months <br /> on March 25, 1980 by Terry Murray (Station Superintendent). A confirming letter was tele-copied to NRC Region III at 0940 hours0.0109 days <br />0.261 hours <br />0.00155 weeks <br />3.5767e-4 months <br /> on March 26, 1980.

Designation of Apparent Cause of Occurrence: The cause of this occurrence is attri-buted to a combination of events which caused the technical specification action state-ment deadline to be exceeded. The first problem was the reedwater swings that occurred when RCP 1-1 was stopped. The unit then had to be stabilized before the shift foreman instrument and control personnel to start their verification of the new could permit The RPS hi flux trip setpoint verification was started one hour, RPS trip setpoints.

twenty minutes after RCP 1-1 was stopped and took one hour and eleven minutes to com-plete.

The next problem was that power was returned to 70% following the reduction made during the f eedwater swings before the sh.if t foreman called instrument and control personnel back to do the flux / delta flux / flow readjustments.

By the time they started, there was only about a half hour left to verify and readjust the four channels before LER #80-019

e TOLEDO EDISON COMPANY DAVIS-BESSE NUCLEAR POWER STATION UNIE Oht SUPPLEMENTAL INFORMATION FOR LER NP-32-80-03 PAGE 2 th2 action statement deadline passed.

It then took 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> and 48 minutes to complete.

Another problem was that the ST 5030.18, Check of RPS Flux /21 Flux / Flow Bistable Setpoint The procedure was new and completion required more time than expected to complete.

tschnicians that did the work were qualified but did not have any previous experience with the procedure.

Analysis of Occurrence: There was no danger to the health and safety of the public or to station personnel. The RPS did reset the trip bistables to reflect the change to three pump operation. The settings were out of tolerance by less than 1%.

The flux trip setpoints were verified properly reset within the action statement deadline.

Corrective Action

On March 23, 1980 at 1940 hours0.0225 days <br />0.539 hours <br />0.00321 weeks <br />7.3817e-4 months <br />, the flux / delta flux / flow trip catpoint readjustments were completed. This removed the station from the action state-cant of Technical Specification 3.4.1.

The station is now in three RCP operation and will remain in such until the refueling outage beginning in April, 1980. A technical specification change will become effective with this new fuel load which will raise the operating limit for three pump operation from 78.3 to 80.2 percent full reactor power.

This means the RPS automatic reset will be conservative and this should eliminate the nted for readjustment which will make it easier to comply with the action statement.

Failure Data: This is the first time the station was unable to verify and readjust RPS trip setpoints within the action statement deadline.

LER #80-019 e