ML19260C121

LER 79-037/03L-0:on 791114 During Routine Maint,Leakage Discovered on Boric Acid Evaporator B Concentrates Pump Discharge Line,Due to Hairline Crack in Type 304 Stainless Steel Pipe.Caused by Chloride Stress Corrosion Cracking

ML19260C121
Person / Time
Site:	Millstone
Issue date:	12/07/1979
From:	Harris J NORTHEAST UTILITIES
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19260C117	List: ML19260C116 ML19260C121
References
LER-79-037-031, LER-79-37-31, NUDOCS 7912180601
Download: ML19260C121 (1)

Text

(7 771 LICENSEE EVENT REPORT

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74 75 REPOR 7 DATE 80 7 8 60 El DOCKET NUMBER EVENT DESCRIPTloN AND PROBABLE CONSEQUENCES h O 2 l During routine maintenance, leakage was discovered on the boric acid evaporator "B" I ITTT1 I concentrates pump discharge line. Examination revealed a hairline crack in a 1-1/2 in.1 ULL*J type 304, schedule 105 stainless steel pipe. A patch was applied to the crack to stoo I

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O s I the leakage. The leakage was contained with> the Radwaste System. Similar occur- l ULL8J l rences: LER 76-28/3L, dated 5/21/79. LER 76-25/30, dated 1/31/77 and LER 79-33, dated i O 7 I

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33 34 36 36 37 40 42 43 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h i O l The cause of the failure is chloride stress corrosion cracking resultino from an I g i earlier brief cross-tie of aerated radwaste (high chloride) and clean liquid radwaste i 2 I systems in 1975. The cracked pipe spool will be reolaced when material is available, i 1 3 l To prevent similar occurrences, the boric acid piDino is beina protected by maintaininal i 4 I low chloride concentrations.

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