05000296/LER-1980-023-01, /01T-0:on 800617,during Normal Operation,Spare Dresser Industries Safety Valve Was Discovered W/Cracks in Guide.Caused by Initial Pouring of Casting & Cooling.Spare Valves Will Be Inspected for Cracks

/01T-0:on 800617,during Normal Operation,Spare Dresser Industries Safety Valve Was Discovered W/Cracks in Guide.Caused by Initial Pouring of Casting & Cooling.Spare Valves Will Be Inspected for Cracks

ML18025A950
Person / Time
Site:	Browns Ferry
Issue date:	06/30/1980
From:	TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18025A949	List: 05000296/LER-1980-023, Forwards LER 80-023/01T-0 05000296/LER-1980-023-01, /01T-0:on 800617,during Normal Operation,Spare Dresser Industries Safety Valve Was Discovered W/Cracks in Guide.Caused by Initial Pouring of Casting & Cooling.Spare Valves Will Be Inspected for Cracks
References
LER-80-023-01T, LER-80-23-1T, NUDOCS 8007080416
Download: ML18025A950 (4)

LER-1980-023, /01T-0:on 800617,during Normal Operation,Spare Dresser Industries Safety Valve Was Discovered W/Cracks in Guide.Caused by Initial Pouring of Casting & Cooling.Spare Valves Will Be Inspected for Cracks

Event date:
Report date:
2961980023R01 - NRC Website

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8 GO G I DOCKET NUMBEA 69 EVENT DATE 14 15 REPORT DATE 80 EVENT OESCRIPT(ON AND PROBABLE CONSEOUENCFS QIO During normal operation it was discovered that a spare Dresser Industries safety valve(

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" had a guide with.cracks.

Preliminary engineering evaluation has shown guide. is a non-J 4

pressure boundary component and not" necessary to maintain integrity of primary coolant system.

Evaluation also indicates no interference with valve operation.

T.S.i t

6 not applicable.

There was no danger to health or safety of public.

No previous I

~O7 occurrence.

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Crack induced during initial pouring'f casting and subsequent cooling with service condition caused cracks to become visible.

Spare valves on hand will be disassembled

~and inspected for cracks.

Valve usage expected to be terminated by spring 1983.

3 Dresser, safety valve,'ode 1 3707RA-RT2 1, Size 6 x 10, pressure c1ass 1500 lbs.

4 A565 material.

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10 NAME OF P RfP hfIE II hhETIEOD OF DISCOVERY

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,LOCATIONOF RELEASE NA NRC USE ONLY 68 FI9 I"IONF.'0 Bl 80 7 ~ \\

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Tennessee Valley Authori~

Browns Ferry Nuclear.

PlaMt L'ER SUPPLEMENTAL INFORMATION Fol1ll BF-17 BF 1512 1/10/79 DFRO 50 296 /

8023 Technical Specification Involved Not applicable Reported Under Technical Specification Dote of Occurrence eftff~

Time of Occurrence '.

Unit Identification and Descr~ition'of Occurrence:

This was first discovered at another utility.

Subsequently, a spare Dresser main steam safety valve was inspected at BFNP and found to have cracks on the upper portion of tPe guides.

Conditions Prior to Occurrence:

Unit 1 Hot shutdown, preparing to go critical for return to service.

Unit 2 Normal operation at 1055

>Me.

Unit 3 Normal operation at 1100

".1We.

Action specified in the Technical Specification Surveillance Requirements met 1~~n b

NA A~>arent Cause of Occurrence:

Cracks were induced at the time of initial pouring of the casting and subsequent cooling with service conditions of alternate high heating and cooling causing the cracks to become more apparent.

Analysis of Occurrence:

Dresser engineering evaluation was that the cracks, due to the method of their forming, would not be liable to propagate.

Battelle Memorial Institu'te has confirmed the initial evaluation of Dresser Engineering Personnel and their metallurgists agree'hat no propagation of the crack is indicated by the sample which was examined.

Corrective. Action:

Cracking in this guide (which is not a pressure retaining part) has no effect on the operation, functionability, or 3esign life of the valve.

All guides will be inspected for cracks.

I'ailute Data:

NA

~Retention: 'riod - Lifetime; Responsibility - Administrative Supervisor

~Revision:

'11

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