ML19242A324

LER 79-006/01T-0 on 790711:during Insp & Repair of Main Feedline,Confirmed That Branch Connection of Auxiliary Feedline Was Not Mfg Per Design Requirements.Branch Connections Replaced by Weldolets

ML19242A324
Person / Time
Site:	Point Beach
Issue date:	07/24/1979
From:	Fay C WISCONSIN ELECTRIC POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19242A321	List: ML19242A320 ML19242A324
References
LER-79-006-01T, LER-79-6-1T, NUDOCS 7908010385
Download: ML19242A324 (2)

Text

NRC FORM 366 U. S. NUCLEAR REGULATORY COMMISSION (7 77)'

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0 tW 61 COCn ET NLYBER bd 63 EVENT DATE 14 REPORT O ATE 63 EVENT DESCRIPTION AND PROB A8LE CONSEQUENCES h a 2 During repair activities connected with the inspection and repair of thel ai3 qmain feeci line (IE Bulletin 79-13), it was confirmed on 7-11-79 that the]

o 4 l branch connection of the auxiliary feed line to the main feed line was l ois ;not fabricated per design requirements. Calculations indicate that reiny a s if orcement of the branch connection falls below that required by Code.

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43 44 47 CAUSE CESCRP.eCN AND CORRECTIVE ACTIONS h i lDuring the main feed line repair outage, the two branch conr. 7tions have l

> lheen replaced by weldolets. Unit 1 auxiliary feed line connections wereI i

[found to have been similarly constructed and will be reinforced to meet i i.il design reqp rements. l

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ATTACHMENT TO LICENGEE EVENT REPORT NO. 79-006/0lT-0 Wisconsin Electric Power Company Point Beach Nuclear Plant Unit 2 Docket No. 50-301 During repair activities connected with NRC IE Bulletin 79- 13 and the replacement of the main feed line reducers and a short length of piping on Unit 2 "A" and "B" steam generators, it was confirmel on July ll, 1979, that the branch connection of the incoming 3" auxiliary feed line at the 16" main feed line was not fabricated per design and Piping Code B31.1 requirements.

Calculations indicate that reinforcement of the branch connection falls below that required by the Code.

It should be noted that approximately eight years of operation, along with a preservice hydrostatic test at 1356 psig and a minimum of one 800 psig leak test per year, have not indicated any problem with the integrity of the.ce branch connections.

During the me feed line repair c tage, the two branch connections have been replaced by weldolets to meet Code requirements.

Unit 1 auxiliary feed line connections were found to have been similarly constructed and will be reinforced to meet design requirements. This repair will be completed as early as practicable following the return to service of Unit 2.

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