05000260/LER-1981-026-03, /03L-0:on 810520,inservice Insp Ultrasonic Exam Did Not Receive Required Evaluation.Caused by Effect of Reduced Recording Level Not Being Recognized Until Recent Questions Were Raised in Area.Procedures Clarified

/03L-0:on 810520,inservice Insp Ultrasonic Exam Did Not Receive Required Evaluation.Caused by Effect of Reduced Recording Level Not Being Recognized Until Recent Questions Were Raised in Area.Procedures Clarified

ML20004G052
Person / Time
Site:	Browns Ferry
Issue date:	06/19/1981
From:	TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20004G051	List: 05000260/LER-1981-026, Forwards LER 81-026/03L-0 05000260/LER-1981-026-03, /03L-0:on 810520,inservice Insp Ultrasonic Exam Did Not Receive Required Evaluation.Caused by Effect of Reduced Recording Level Not Being Recognized Until Recent Questions Were Raised in Area.Procedures Clarified
References
LER-81-026-03L-01, LER-81-26-3L-1, NUDOCS 8106290055
Download: ML20004G052 (2)

LER-1981-026, /03L-0:on 810520,inservice Insp Ultrasonic Exam Did Not Receive Required Evaluation.Caused by Effect of Reduced Recording Level Not Being Recognized Until Recent Questions Were Raised in Area.Procedures Clarified

Event date:
Report date:
2601981026R03 - NRC Website

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> EVENT oESCRIPTioN ANo PROB A81LE CONSEQUENCES Oto r'Til 1 During review of ISI performed on unit 2 HPCI piping, it was found that one ISI l

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... a Tennessee Valley Authority Form BF 17 Br: owns Ferry Nuclear Plant BF 15.2 6/04/81 1.ER SUPPLEMENTAL !NFORMATIOi' BFRO-50, _2_60 / 81026_ Technical Specification involved 4.6.G lleported Under Technical Specification 6.7.2.b.(3)

• oate due Nac:_6/19/81 Date of Occurrence,5/20/81 Time of Occurrence 0720 Unit 2

Identification and Description _of Occurrence; One ISI ultrasonic exam perfonned on unit 2 piping did not receive evaluation required to meet TVA's comitment to 1971 edition, sumer 1971 Addenda of Section XI.

Conditions Prior to occurrence:

Unit i refueling outage Unit 2 at 99%

Unit 3 at 100%

Action specified in the Technical Specification SurveiUance Requirements met due to inoperable equipment. Describe.

None Apparent Cause of Occurrence:

Previous calibration reflector comparison between 5% notch and side drilled holes had indicated comparable sensitivity when used with summer 1971 recording levels. The effect of the reduced recording level required by the sumer 1975 code was not

. recognized until recent review of ultrasonic testing raised questions in this area.

Anaipis of Occurrence:

There was no danger to the health or safety of the public, no release of activity, no damage to the plant or equipment, and no resulting significant chain of events.

Corrective Action

The weld will be reexamined at the next refueling outage in accordance with applicable requirements. All scanning records have been reviewed and meet the recordir,9 and evaluation lesel required by the Sumer 1978 Code except for six welds which meet the recording and cyaluation level required by the Sumer 1971 Code w%rggsDgggforthebaselineexaminations.

None Retention:

Per' d - Lifetime; Responsibility - Document Control Supertisor

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