05000260/LER-1980-025-01, /01T-0:on 800617,during Normal Operation Discovered That Spare Dresser Industries Safety Valve Had Guide W/Cracks.Caused During Initial Pouring of Casting & Subsequent Cooling.Addl Valves Will Be Inspected for Cracks

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

ML18025A941
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
ML18025A940	List: 05000260/LER-1980-025, Forwards LER 80-025/01T-0 05000260/LER-1980-025-01, /01T-0:on 800617,during Normal Operation Discovered That Spare Dresser Industries Safety Valve Had Guide W/Cracks.Caused During Initial Pouring of Casting & Subsequent Cooling.Addl Valves Will Be Inspected for Cracks
References
LER-80-025-01T, LER-80-25-1T, NUDOCS 8007080373
Download: ML18025A941 (4)

LER-1980-025, /01T-0:on 800617,during Normal Operation Discovered That Spare Dresser Industries Safety Valve Had Guide W/Cracks.Caused During Initial Pouring of Casting & Subsequent Cooling.Addl Valves Will Be Inspected for Cracks

Event date:
Report date:
2601980025R01 - NRC Website

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Pre 1iminary engineering eva 1uation has shown guide is a non-J

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coolant system.

Evaluation'lso indicates no interference with v'alve operation.

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No previous o ccurrence.

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condition caused cracks to become visible.

Spare valves on hand will be disassembled and inspected for cxacks.

Valve usage expected to be terminated by spring 1983.

Dresser safety valve, Model 3707RA-RT21, Size 6 x 10, pressure class 1500 lbs.,

3 A565 matex'ial.

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Tennessee Valley Author~

~ ".=Browns Ferry Nuclear PPKt Form BF-l7 BF 15.2 1/10/79 LER SUPPLEMENTAL INFORMATION DFRO 260

/ 8025 Technical Specification Involved Not aPPlic~bl~

Reported. Under Technical Specification

6. 7.2 a(9)

Date of Occur rence 6/17/80 Time of Occurrence 12:30 p'Unit Identification and Description'of Occurrence:

This was ttrst Ciscovered at another ut sty..

Subsetuently, a spare Dresser main steam safety valve was insp'ected at BFNP and found to have cracks on the upper portion of the guides.

Conditions Prior to Occurrence:

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

Unit 2 Normal operation at 1055 K<e.

Unit 3 Normal operation at 1100 M<e.

Action. specified in the Technical SpecQ'ication Surveillance Requirements met Apparent 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.

'~Anal sis of Occurrence; Dresser engineering evaluation was that the cracks, due to the method of their forming, would not be liable to propagate.

Battelle htemorial Institute has confirmed the initial evaluation of Dresser Engineering Personnel and their metallurgist agrees:

that 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 design life of the valve.

All guides will be inspected for cracks.

Failure Data:

NA

~:Reten tion:

~Re.vision:

v eriod - Lifetime; Responsibility - Administrative Supervisor

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