ML19319B735

RO NP-33-77-28:on 770729,HPIS Line 1-2 Removed from Svc to Perform Hydrostatic Test on Valve HP49.Test Completed & Hpis Valve HP2D Returned to Svc

ML19319B735
Person / Time
Site:	Davis Besse
Issue date:	08/19/1977
From:	Batch S, Lingenfelter J TOLEDO EDISON CO.
To:
Shared Package
ML19319B599	List: ML19319B598 ML19319B735
References
TAC-48560, NUDOCS 8001270191
Download: ML19319B735 (2)

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TOLEDO EDISON COMPANY DAVIS-BESSE UNIT ONE NUCLEAR PCWER STATION SUPPLEMENTAL INFOPEATION FOR LER NP-33-77-23 DATE OF EVENT: July 29, 1977 FACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE: Removed High Pressure Injection Line 1-2 from Service to perform hydrostatic test Conditions Prior to occurrence: The plant was in Mode 3, with Power (MWT) = 0 and Load (MWE) = 0. .

Description of Occurrence: In October, 1976, it was discovered that the welded stellite seat was cracked in one of the four High Pressure Injection (HPI)

Line Stop Check Valves, HP49. The valve was replaced in February, 1977, with a new stop check valve which required a complete reweld to install the new body. Since welding had been performed on the piping, a hydrostatic test on that section of pipe had to be completed. Since there are no isolatable boundaries between HP49 and the Reactor Coolant System (R.C.S.), the hydrostatic test had to be delayed until the Reactor Coolant System was pressurized. At 1100 hours0.0127 days <br />0.306 hours <br />0.00182 weeks <br />4.1855e-4 months <br /> on July 29, 1977, with the R.C.S. pressurized to 2120 PSIG, HP49 was hydro tested. This required removing power from injection valve HP2D ren-(p) .

dering one of the two flow paths for HPI Pump 1-1 inoperable. At this time the

\_s/ plant was in Mode 3 for which Technical Specification 3.5.2 required entry into i an action statement if either HPI Pump is inoperable. At 1630 hours0.0189 days <br />0.453 hours <br />0.0027 weeks <br />6.20215e-4 months <br /> on July 29, 1977, the hydro test was completed and power restored to HPI Valve HP2D. This removed the Station from the action. statement of Technical Specification L.5.2.

Designation of Apoarent Cause of Occurrence: The cause of this event was deliberately entering an action statement to perform the required hydrostatic test.

Analvsis of Occurrence: Since HPI Pump 1-2 was operable and only one of the two HPI Pump 1-1 Injection Valves was inoperable, H.P.I. would be supplied if needed under accident conditions; therefore, no threat occurred to the health rad safety of the public or to Station personnel.

Corrective Action: The hydrostatic test was completed and power restored to the High Pressure Injection Valve, HP2D, by 1630 hours0.0189 days <br />0.453 hours <br />0.0027 weeks <br />6.20215e-4 months <br /> on July 29, 1977.

Failur0 Data: No previous similar events have occurred.

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