05000302/LER-1979-111-03, /03L-0:on 791224,while Performing Daily Operating Surveillance,Leak Discovered in Drain Line on Discharge Pipe MUP-13.Caused by Cyclic Stress Fatigye.Weld Area Repaired & Mods to Drain Lines Completed

/03L-0:on 791224,while Performing Daily Operating Surveillance,Leak Discovered in Drain Line on Discharge Pipe MUP-13.Caused by Cyclic Stress Fatigye.Weld Area Repaired & Mods to Drain Lines Completed

ML19257C503
Person / Time
Site:	Crystal River
Issue date:	01/16/1980
From:	Lancaster K FLORIDA POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19257C501	List: 05000302/LER-1979-111, Forwards LER 79-111/03L-0 05000302/LER-1979-111-03, /03L-0:on 791224,while Performing Daily Operating Surveillance,Leak Discovered in Drain Line on Discharge Pipe MUP-13.Caused by Cyclic Stress Fatigye.Weld Area Repaired & Mods to Drain Lines Completed
References
LER-79-111-03L, LER-79-111-3L, NUDOCS 8001290249
Download: ML19257C503 (2)

LER-1979-111, /03L-0:on 791224,while Performing Daily Operating Surveillance,Leak Discovered in Drain Line on Discharge Pipe MUP-13.Caused by Cyclic Stress Fatigye.Weld Area Repaired & Mods to Drain Lines Completed

Event date:
Report date:
3021979111R03 - NRC Website

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SUPPLEMENTARY INFORMATION Report No..

50-302/79-lll/03L-0 Facility:

Crystal River Unit #3 Report Date:

16 January 1980 Occurrence Date:

24 December 1979 Identification of Occurrence:

Degradation of the Makeup System (MUP-1B Discharge Drain Line)

Reportable under Technical Specification 6.9.1.9.d.

Conditions Prior to Occurrence:

Mode 1 power operation (1007.).

Description of Occurrence:

At 0030 while performing Daily Operating Surveillance SP-300, a piphole leak was discovered in the drain line on MUP-1B discharge pipe upstream of valve MUV-347.

Further investiga-tion revealed that the leak originated from a failure in the weld area of the pipe elbow. The affected area was repaired and MUP-1B was returned to service at 2345 on 27 December 1979.

Designation of Apparent Cause:

The cause of this event is attributed to cyclic stress fatigue.

Analysis of Occurrence:

No effect upon the plant or genera 3 public as redundant makeup pumps MUP-1A and MUP-lC were operab'.e.

Corrective Action

A modification (79-7-7), to reduce cyclic stress on all makeup pump discharge drain lines was completed on 11 January 1980.

The modification involved the installation of piping restraints on the discharge lines of each makeup pump.

Engineering evalua-tion of this event is undergoing further review.

Failure Data:

~E!s is the fifth occurrence of this type reported for MUP-1B.

~

rence LER 79-63, 82, 93, and 102.

/rc 1840 117