ML19319B756

RO NP-33-77-43:on 770801,boration Sys Flow Path Found Inoperable Due to Closed Discharge Valves MU349 & MU354. Caused by Procedure & Personnel Errors During Weekly Boron Concentration Test.Surveillance Test Procedure Modified

ML19319B756
Person / Time
Site:	Davis Besse
Issue date:	08/25/1977
From:	Lingenfelter J, Murray T TOLEDO EDISON CO.
To:
Shared Package
ML19319B647	List: ML19319B646 ML19319B756
References
NUDOCS 8001270218
Download: ML19319B756 (2)

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l f TOLEDO EDISON COMPANY l s DAVIS-BESSE UNIT ONE NUCLEAR POWER STATION t SUPPLEMENTAL INFORMATION FOR LER NP-33-77-43 DATE OF EVENT: August 1, 1977 l FACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE: 3 oration Systems Flow Path Incparable Conditions Prior to occurrence: The plant was in Mode 3, with Power (MWT) = 0 and Load (MWE) = 0.

! Description of Occurrence: At 1147 hours0.0133 days <br />0.319 hours <br />0.0019 weeks <br />4.364335e-4 months <br /> on August 1, 1977, the Reactor Operator attempted to add makeup to the Reactor Coolant System vole =e by " batching" in the required ratio of boric acid from the Boric Acid Addition Tanks and water from the Primary Water Storage Tank, to maintain the Reactor Coolant Boron Concentra-tion at the existing level. When he tried to pump in the boric acid, he was unable to get flow through either Boric Acid Pump. This placed the Station in the Action Statement of Technical Specification 3.1.2.2 as we did not have an operable flow path from the concentrated boric acid storage sysr.em.

A valve lineup check was made and two valves (MU349 & MU354), one in the path of a

each pump, were found closed. The valves were opened and the flowpaths for each pump were verified at 1200 hours0.0139 days <br />0.333 hours <br />0.00198 weeks <br />4.566e-4 months <br />. This removed the station from the Action Statement.

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. Designation of Apparent Cause of Occurrence: At 1444 hours0.0167 days <br />0.401 hours <br />0.00239 weeks <br />5.49442e-4 months <br /> on July 26, 1977, l #2 Boric Acid Addition Tank was taken off recirculation following the weekly sampling to determine baron concentration in accordance with Surveillance Test i ST 5052.02. At 1456 hours0.0169 days <br />0.404 hours <br />0.00241 weeks <br />5.54008e-4 months <br />, the same day, #1 Boric Acid Addition Taak was taken off recirculation following its weekly Surveillance Test for boron concentration.

Due to an error in the procedure, the lineup was not properly restored to normal in that MU349 was not re-opened. There was operator error in that MU354 should j not have been closed to perform the recirculation in the first place.

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l t Analysis of Occurrence: The boration path from the Borated Water Storage Tank was operable throughout this occurrence, and the Reactor Coolant System Boron Concentration was still at refueling concentration (1944 ppm), which gives a i shutdown margin of 9%d-ef There was no threat to the health and safety of the

. public or Station personnel.

I Corrective Action: The procedure has been modified to correccly positicn MU349 g upon co=pletion of recirculatica of No. 2 3cric Acid Addition Tank. The

. NP-33-77-43

. procedure has also been :sodified to perform an independent verification of the valve positions in the flev path following recirculation of the Soric Acid Addition Tanks.

Failure Data: No previous similar events have occurred.

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