ML19254F947

LER 79-033/03L-0:on 791011,during Routine Maint,Leakage Discovered on Recovered Boric Acid Pump Suction Line.Caused by Chloride Stress Corrosion Due to Salt Water Leakage to Aerated Waste Drains.Pipe Spool Will Be Replaced

ML19254F947
Person / Time
Site:	Millstone
Issue date:	11/09/1979
From:	NORTHEAST UTILITIES
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19254F945	List: ML19254F944 ML19254F947
References
LER-79-033-03L-01, LER-79-33-3L-1, NUDOCS 7911190497
Download: ML19254F947 (1)

Text

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LICENSEE EVENT REPORT CONTHOL DLOCK: l 1

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HEPOHT DATE 7 60 DOCKE T NUYBE rt EVENT DESCRIPTlON AND PROBADLE CdCSEQUENCES h O 2 1 Durina routine naintenance, leakaae was discovered on thn rnenvorna bnric ac t ri nynn l l0 l3 l l suction line. Examination revealed a hairline crack in a_ three inch. typn'304. 1 0 4 l schedule 10S stainless steel pipe on the pipe side of the nine to conn suctinn I o s i valve weld. A patch was applied to the crack to stop the leakaoe. The leakane i O o l was contained within the Radwaste System. Similar occurrences: LER 76-28/3L. I O 7 l dated 5/21/76 and LER 76-25/30, dated 1/31/77. I I

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS i O l The cause of the failure is chloride stress corrosion due to the crosonco nf chlnridne I i i from salt water leakage to aerated waste drains and hiah tenneratnen nrnennt in thn I

, , [ concentrators as reported in LER 76-25/30. The cracked pipe spool will be reolaced I g,i3; l when' material is available. To prevent similar occurrences, the boric acid ninino I

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