05000336/LER-1979-037-31, /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

/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: 05000336/LER-1979-037, Forwards LER 79-037/03L-0 05000336/LER-1979-037-31, /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
References
LER-79-037-031, LER-79-37-31, NUDOCS 7912180601
Download: ML19260C121 (1)

LER-1979-037, /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

Event date:
Report date:
3361979037R31 - NRC Website

text

(7 771 LICENSEE EVENT REPORT coNToot stocic:

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60 El DOCKET NUMBER 68 63 EVENT 0 ATE 74 75 REPOR 7 DATE 80 EVENT DESCRIPTloN AND PROBABLE CONSEQUENCES h l During routine maintenance, leakage was discovered on the boric acid evaporator "B" I

O 2 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

[_1_1/ 9/79.

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The cracked pipe spool will be reolaced when material is available, i

l To prevent similar occurrences, the boric acid piDino is beina protected by maintaininal 1 3 I low chloride concentrations.

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