View source for 05000346/LER-1980-038-03, /03X-1:on 800420,svc Water Discharge Header Pressure Relief Valve SW Psv 3962 Was Continuously Discharging & Would Not Reseat.Caused by backed-off Adjusting Ring.Spring Tension Readjusted

{{Adams
| number = ML19345G542
| issue date = 03/31/1981
| title = /03X-1:on 800420,svc Water Discharge Header Pressure Relief Valve SW Psv 3962 Was Continuously Discharging & Would Not Reseat.Caused by backed-off Adjusting Ring.Spring Tension Readjusted
| author name = Stotz J
| author affiliation = TOLEDO EDISON CO.
| addressee name = 
| addressee affiliation = NRC OFFICE OF INSPECTION &amp; ENFORCEMENT (IE REGION III)
| docket = 05000346
| license number = 
| contact person = 
| document report number = LER-80-038-03X, LER-80-38-3X, NUDOCS 8104070491
| package number = ML19345G537
| document type = LICENSEE EVENT REPORT (SEE ALSO AO RO), TEXT-SAFETY REPORT
| page count = 2
}}
{{LER
| Title = /03X-1:on 800420,svc Water Discharge Header Pressure Relief Valve SW Psv 3962 Was Continuously Discharging & Would Not Reseat.Caused by backed-off Adjusting Ring.Spring Tension Readjusted
| Plant = 
| Reporting criterion = 
| Power level = 
| Mode = 
| Docket = 05000346
| LER year = 1980
| LER number = 38
| LER revision = 3
| Event date = 
| Report date = 
| ENS = 
| abstract = 
}}

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8 60 G1 DOCKET NUMUE R 64 tc EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h [a l 2 l l-(NP-33-80-47) On 4/20/80 at 1430 hours dttring the pc"pance of the Service Water Syq-l tem Refueling Relief Valve Test ST 5075.03, maintenance personnel found that Service ]
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TOLEDO EDISON COMPANY DAVIS-BESS NUCLEAR POWER STATION UNIT ONE SUPPLEMENTAL INFORMATION FOR LER NP-33-80-47 DATE OF EVENT: April 20, 1980 FACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE:
Service Water Dircharge Header Pressure Relief Valve SW PSV 3962 would not rescat The unit was in Mode 6, with Power (MRT) = 0 and Conditions Prior t.
arrence:
Load (Gross FME) = 0.
Description of Occurrence: On April 20, 1980 at 1430 hours, during the performance of the Service Water System Refueling Relief Valve Test, ST 5075.03, maintenance personnel observed that SW PSV 3962 was continuously discharging and would not rescat even when pressure was reduced well below its relieving point.
This valve provides overpressurization protection for the service water discharge header.
Being in Mode 6, the station did not enter the action statement of Technical Specifi-cation 3.7.4 which requires there be two independent service water loops operable in Modes 1, 2, 3, and 4.
Designation of Apparent Cause of Occurrence:
SW PSV 3962 failed because the adjust-1l ing ring that controls the relieving pressure had backed off and was preventing the valve from seating. There was no spring tension holding the valve closed. Essentially, the valve was continuously leaking by.
The locking mechanism on the adjusting ring was not holding the ring at its desired position. The bellows was also found to be SW PSV 3963 in the other service ruptured but was not a cause of the valve failure.
water loop was checked and had a ruptured bellows, but it was not continuously leaking by and was only slightly out of tolerance in the conservative direction.
1l Deleted.
There was no danger to the health and safety of the public Analysis of Occurrence:
or to station personnel.
The valve was providing overpressurization protection.

==Corrective Action==
Under Main tenance Work Order 80-1319; SW PSV 3962 was repaired
.by replacing the bellows and readjusting the spring tension which concrols the A locking mechanism was remachined to provide a better hold to relieving pressure.
prevent it from backing off. SW PSV 3963 also had its bellows replaced. The repaired 1l valves were successfully tested under ST 5075.03 on May 23, 1980 and placed back in service.
Failure Data: _There have been no previously reported failures.
LER Id0-038
}}

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