05000298/LER-1980-037-03, /03L-0:on 801006,during Surveillance Testing of RHR Svc Water Sys,Sw Throttle Valve on Discharge of B Heat Exchanger Would Not Allow Sys Flow to Pass.Caused by Missing Disc Skirt.Disc & Stem Nut for SW-MO-89B Replaced

/03L-0:on 801006,during Surveillance Testing of RHR Svc Water Sys,Sw Throttle Valve on Discharge of B Heat Exchanger Would Not Allow Sys Flow to Pass.Caused by Missing Disc Skirt.Disc & Stem Nut for SW-MO-89B Replaced

ML19343A829
Person / Time
Site:	Cooper
Issue date:	11/03/1980
From:	Doan P NEBRASKA PUBLIC POWER DISTRICT
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19343A821	List: 05000298/LER-1980-037, Forwards LER 80-037/03L-0 05000298/LER-1980-037-03, /03L-0:on 801006,during Surveillance Testing of RHR Svc Water Sys,Sw Throttle Valve on Discharge of B Heat Exchanger Would Not Allow Sys Flow to Pass.Caused by Missing Disc Skirt.Disc & Stem Nut for SW-MO-89B Replaced
References
LER-80-037-03L, LER-80-37-3L, NUDOCS 8011210570
Download: ML19343A829 (1)

LER-1980-037, /03L-0:on 801006,during Surveillance Testing of RHR Svc Water Sys,Sw Throttle Valve on Discharge of B Heat Exchanger Would Not Allow Sys Flow to Pass.Caused by Missing Disc Skirt.Disc & Stem Nut for SW-MO-89B Replaced

Event date:
Report date:
2981980037R03 - NRC Website

text

U. S. NUCLEAR [E ULATORY COMMIS$40N CRO FDR$4 366 (7 77f LICENSEE EVENT REPORT CONTROL BLOCK; l l

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00 P3 OOCKET NUM8ER 68 89 EVENT DATE 14 15 REPORT DATE 80 EVENT DESCRIPTION ANO PROBA8LE CONSEQUENCES C10 jDuring normal surveillance testing oT the RHR Service Water System, SW-MO-89B, the [0l2 p pr} lSW throttle valve on the discharge of the "B" RHR heat exchanger would not allow lol4I frequired system flow to pass. The redundant loop was operable as well as both die-I l o t s 1 Isel generators. There were no adverse affects to the public health and safety.

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JJ J4 35 36 31 40 44 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS @

lt I o f ISW-MO-89B is a 18", 300# Globe Valve.

Subject valve was disassembled and ir.spected.1 t,i,1ij IValve dise had separated from the stem and the disc skirt which acts as a zuide was1 [TT 1 Imissing. Pieces removed downstream.

Parts replaced.

"A" loop valve inspected andi E Ialthough still operable. had the same problem. Parts replaced. Cause due to ext-l

14l Ireme cavitation. Vendor is redesianine disc to be installed at a later date.

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