05000259/LER-1979-013-01, /01T-0 on 790723:in Response to IE Bulletin 79-02, 44 Anchors on safety-related Piping Were Visually Inspected. Two Were 1/2 Inch Short.On Non safety-related Piping,Two Slipped & Two Pulled Out.Caused by Rebar Interference

/01T-0 on 790723:in Response to IE Bulletin 79-02, 44 Anchors on safety-related Piping Were Visually Inspected. Two Were 1/2 Inch Short.On Non safety-related Piping,Two Slipped & Two Pulled Out.Caused by Rebar Interference

ML19242C450
Person / Time
Site:	Browns Ferry
Issue date:	08/06/1979
From:	TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19242C445	List: 05000259/LER-1979-013-01, /01T-0 on 790723:in Response to IE Bulletin 79-02, 44 Anchors on safety-related Piping Were Visually Inspected. Two Were 1/2 Inch Short.On Non safety-related Piping,Two Slipped & Two Pulled Out.Caused by Rebar Interference
References
LER-79-013-01T, LER-79-13-1T, NUDOCS 7908100432
Download: ML19242C450 (2)

LER-1979-013, /01T-0 on 790723:in Response to IE Bulletin 79-02, 44 Anchors on safety-related Piping Were Visually Inspected. Two Were 1/2 Inch Short.On Non safety-related Piping,Two Slipped & Two Pulled Out.Caused by Rebar Interference

Event date:
Report date:
2591979013R01 - NRC Website

text

RC F oRM 366 U. S. NUCLE AR REGULATORY COMMISSION 11)

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EVENT DEscal TION AND PROB A LE C NS ENCES

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l With plant in normal operation, a field inspection was perforced on various piping l

1 system hangers in response to IE Bulletin 79-02.

On saf ety-related piping 44 anchors [

3 l were visually inspected; two were inch short. On non-safety-related piping 18 bolt ]

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A is I anchors were pull-tested; two slipped and two pulled out.

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4G 41 42 4j 44 47 CALSE DESCRIPTION AND CCARECTIVE ACTIONS h l The short anchorages were due to rebar interference. TVA has evaluated these modified l 1 J l anchorages and has determined the supports were not degraded such that they could I

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, Tennessee Valley Authority Form BF-17 Browns Ferry Nuclear Plant BF 15.2 1/10/79 LER SUPPLEMENTAL INFORMATION BFRO-50+

259 / 7913 Technical Specification Involved Reported Under Technical Specification T. S. 6.7.2.a(9)

Date of Occurrence 7-23-79 Time of Occurrence 5:00 p.ci. Unit common Identification and Description of Occurrence:

In response to IE Bulletin 7F62, field inspection of anchors on various piping systems revealed two bc1ts cut off about " on safety-related systems (44 bolts inspected visually),and two slipped and two pulled out on non-safety-related systems which were pull tested (18 were tested).

Conditions Prior to Occurrence:

Plant in normal operation with all units at steady state.

L' nit 1 - 94%, unit 2 - 99%,

and unit 3 - 91?..

Action specified in the Technical Spectrication Surveillance Requirements met due to inoperable equipment.

Describe.

NA Apparent Cause of Occurrence:

Anchorages were shortened due to rebar interference.

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A'1alvsts of ( >ccurrence:

Being performed by Engineering Design, TVA.

Carrective Act:en:

Engineering Design evaluating.

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.I Failure Data:

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• R et en tion :

Period - Lifetime; Respunribility - Administrative Supervisor

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