05000259/LER-1979-013, Update to LER 79-013/01X-2:on 790723,discovered 163 Deviations in 2,151 Expansion Anchors Inspected.Caused by Rebar Interference,Shortbolts & Improperly Seated Anchors. Program to Correct Anchors Ongoing W/Insp Effort

Update to LER 79-013/01X-2:on 790723,discovered 163 Deviations in 2,151 Expansion Anchors Inspected.Caused by Rebar Interference,Shortbolts & Improperly Seated Anchors. Program to Correct Anchors Ongoing W/Insp Effort

ML19254F750
Person / Time
Site:	Browns Ferry
Issue date:	11/13/1979
From:	TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19254F749	List: 05000259/LER-1979-013, Update to LER 79-013/01X-2:on 790723,discovered 163 Deviations in 2,151 Expansion Anchors Inspected.Caused by Rebar Interference,Shortbolts & Improperly Seated Anchors. Program to Correct Anchors Ongoing W/Insp Effort
References
LER-79-013-01X, LER-79-13-1X, NUDOCS 7911160521
Download: ML19254F750 (2)

LER-1979-013, Update to LER 79-013/01X-2:on 790723,discovered 163 Deviations in 2,151 Expansion Anchors Inspected.Caused by Rebar Interference,Shortbolts & Improperly Seated Anchors. Program to Correct Anchors Ongoing W/Insp Effort

Event date:
Report date:
2591979013R00 - NRC Website

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i 4RC FORM 366 UPDATE REPORT - Previous Report Date 9/12/79 U.S. NUCLEAR REGULATORY COMMISSION (7-77)

LICENSEE EVENT REPORT CONTROL BLOCK: l l

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8 60 61 DOCKET NUM8ER 68 69 EVENT OATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h o 2 i With unit 1 at 1035 MWe, unit 2 at 1095 MWe. and unit 3 in outage. TVA's field inspec-l t

i o 13 l l tion and evaluation program of self-drilling expansion anchors is continuing in accor-l

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1 dance with IE Bulletins 79-02, 79-02 R1, and 79-02 R1 Supplement 1. To date 2151 anchors!

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s I have been inspected in safety-related piping systems. 163 deviations have been l

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l found. Initial pull-tests on 18 bolt anchors on non-saf ety-related piping resulted l

l with two slipping and two pulling out.

There was no effect to health or safety of thel o

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public. Event was reported under T. S. 6.7.2.a.(9).

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CODE TYPE NO.

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37 40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h l Deviations during installation were due to rebar interference. shortbolts and improper-l i

o li li l l 1y seated anchors. The anchorages with deviations are being evaluated by TVA's Divi-I g lsion of Engineering Design.2s found. The Division of Engineering Design is continuing l l to evaluate the results of the ongoing inspection program. A repair program to immedi-j i

3 lately correct improperly installed anchors is ongoing with'the inspection effort.

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% POWE R OTHER STATUS dis O RY DISCOVERY DESCRIPTION 32 y W@ l 0 l 9 l 5 l@l NA l

{ @l Inspection due to IE Bulletins l

ACTIVITY CO TENT RELE ASED OF RELE ASE AMOUNT OF ACTlvlTY LOCATION OF RELEASE NA l

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8 9 10 11 44 45 80 PERSONNEL EXPOSURES NUMRER TYPE

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'J 10 80 ISSUE" D E SCRIP TION [3_LoJ LIJ81 Press release i

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g 9 to 68 69 80 NAME OF PREPARER PHONE:

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Ter.ncs.ve Valicy Authority Fu n. fiF-17 Bra.v.u, Terry Nuclear Plant l' F 18. "

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LER SUPPLEMENTAL INFORMATION BFRO 259 / 7913 R1 Technical Specification Involved __ NA Reported Under Technical Specification T. S. 6.7.2.a(9)

Date <>f Occurrence 7/23/79 Time of Occurrence 5:00 p.m. Ur.it common Identification and Description of Occurrence:

In response to IE Bulletins 79-02 R1 and 79-02 R1, Supplement 1, field inspections of anchors on various piping systems (2151 anchors inspected to date) have revealed 163 deviations. On non-safety-related piping,18 bolt anchors were pull tested, two slipped,and two pulled out.

Conditions ' Prior to Occurrenec:

Plant in normal operation. Unit 1 - 1035 We, unit 2 - 1095 We, unit 3 - refueling outage.

Aethn :,recified in the Technical Specification Surveillance Requirements. net due tr. inoperable egipment. Describe.

N/A Aypar1nt_ Cause of occurrence:

Anchorages were shortened due to rebar interference.

Ana.l r.is of Occurrence:TVA's Division of Engineering Design analysis indicates all l

anchorages with deviations to be adequate with safety factors greater than 2.

The evaluation of the results of the ongoing inspection program continues. Subsequent to the four initial pull-test failures, 52 inchors were pull-tested on non-safety-related piping and 40 anchors tested on safety-related piping with all anchors passing at proof loads.

Corrt.ctive Action:

A repair program has been initiated by field forces to correct improperly installed anchors.

Failure Data:

NA

1. Retention :

Period - Lifetime; Resnonsibility - Admmi trative Superv.;or

• Revision.

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