05000321/LER-1981-041-01, /01T-0:on 810506,during Surveillance walkdown,23 Pipe Supports Failed Support Functionality Criteria Per IE Bulletin 79-14.Caused by Supports Exceeding Design Criteria. Supports to Be Modified or Replaced

/01T-0:on 810506,during Surveillance walkdown,23 Pipe Supports Failed Support Functionality Criteria Per IE Bulletin 79-14.Caused by Supports Exceeding Design Criteria. Supports to Be Modified or Replaced

ML20004B661
Person / Time
Site:	Hatch
Issue date:	05/19/1981
From:	Coggin C GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20004B660	List: 05000321/LER-1981-041, Forwards LER 81-041/01T-0 05000321/LER-1981-041-01, /01T-0:on 810506,during Surveillance walkdown,23 Pipe Supports Failed Support Functionality Criteria Per IE Bulletin 79-14.Caused by Supports Exceeding Design Criteria. Supports to Be Modified or Replaced
References
IEB-79-14, LER-81-041-01T, LER-81-41-1T, NUDOCS 8105290253
Download: ML20004B661 (3)

LER-1981-041, /01T-0:on 810506,during Surveillance walkdown,23 Pipe Supports Failed Support Functionality Criteria Per IE Bulletin 79-14.Caused by Supports Exceeding Design Criteria. Supports to Be Modified or Replaced

Event date:
Report date:
3211981041R01 - NRC Website

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8 6U 61 DOCKCT fvUf/GLH ul 6J EVENT DATE 74 75 HCPOHT DATE 80 EVENT DESCRIPTIOfJ AND PROBABLE CONSEQUENCES h o 2 10n 5-6-81. with Unit I shutdown for a refuelina/ torus modification out-I to la i lace, the AE conducted a surveillance walkdown of pipe supports per IE3 I

179-14 and then notified the site that a total o f 23 supports had failed 1 o 4 o s Ithe support functionality criteria ftr IEB 79-14.

This is a repetitive I l o lo I Luxu rren ce : see LER 50-_321/1981-039.

There were no effects on nublic lo'i71[h_ealth or safety.

No systems operabilities were affected.

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50-321/1981-041 Licensec:

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Narrative

Report for LER 50-321/1981-041 On'5-6-81, with Unit 1 shutdown for a refueling / torus modif-ication outage, the AE conducted a surveillance walkdown of pipe supports per IEB 79-14 and notified the site that a total-of 23 supports had failed the support functionality criteria for IEB 79-14.

The supports and associated types of failures are as follows:

Pipo Support Failures of~ Functionality Requirements 1.

L21-X29-H800:

Spring is bottomed out.

2.

B21-X29-II804 :

Stress in structural members resulting from weight plus DBE scismic loads excccds the matcrial yield stress.

3.

B31-Il001 :

The support does not act in the designed direction.

4.

T45-H002:

Support is not carrying the weight load of the pipe.

5.

N11-MSil-1:

Stress in structural members resulting. from weight plus DBE scismic loads exceeds the material yield stress.

6.

N11-MSH-2:

Stress in structurai members resulting from weight plus DBE scismic loads exceeds the material yield stress.

7.

N11-MSH-16:

Deflection of the support resulting from weight plus DBE scismic loads exceeds 1/4".

8.

N11-MSH-43:

Load in the standard support component (hyd-raulic snubber) exceeds the MFGRs recommended allowable based en the pressure relief valve setting for the unit.

9.

N11-MSH-46:

Load in~the standard support component (hyd-raulic snubber) excceds the MFGRs recommended allowabic based on the pressure relief valve setting for the unit.

10.

N11 -MSi!-47 :

Load in the standard support component (hyd-raulic snubber) exceeds the MFGRs recommended allowable based on the pressure relief valve setting for the unit.

11.

P41-SWil-10:

Stress in structural members resulting from weight plus DBE scismic loads exceeds the material yield 1

stress.

12.

P41 - SWil-9 2 :

De flection of the support resulting from weight plus DBE seismic loads exceeds 1/4".

13.

P41 -SWil-101 :

Stress in structural members resulting from

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weight plus DBE seismic loads exceeds the material yield stress.

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14.

P41-SWil-102 :

Stress in structural members resulting from weight plus DBE scismic loads exceeds the material yield stress.

15.

P41-SWH-105:.

Stress in structural members resulting from weight plus DBE scismic loads exceeds the material yield stress.

16.

P41-SWH-113:

Stress in structural members resulting from weight plus DBE scismic loads exceeds the material yield stress.

17.

P41-SWH-116:

Stress in structural members resulting from weight plus DBE seismic loads exceeds the material yield stress.

18.

P41-SWH-119:

Stress in structural members resulting from weight plus DDE scismic loads exceeds the material yield stress.

19 P41-SWH-150:

Stress in structural members resulting from weight plus DBE scismic loads exceeds the material yield stress.

20.

P41-SWH-153:

Stress in structural members resulting from weight plus DBE scismic loads exceeds the material yield stress.

21.

P41-SWH-154:

Stress in structural members resulting from weight plus DBE scismic loads exceeds the material yield stress.

22.

P41-SWH-157:

Stress in structural members resulting from weight plus DBE scismic loads exceeds the material yield stress.

23.

P41-SWH-165B:

The support is not acting in the analyzed direction.

This is a

repetitive occurrence; see LER 50-321/1981-039.

There were no offects on public health or safety.

No systems operabilitics ucre affected.

The support functionality criteria failures occurred because the design requirements of the supports were exceeded.

Six types of failures were detected in the twenty-three supports:

1.

Some supports have stresses in structural members result-ing from weight plus DBE scismic loads exceeding the materials yield stresses.

2.

Spring bottomed out.

3.

Supports not acting in analyzed and designed directions.

4.

Support not carrying the weight load of pipe.

5.

Deflection of support resulting from weight plus DBE.

6.

The load in the standard support component (hydraulic snubber) exceeds the manufacturer's recommended a)1owabic based on the pressure relief valve setting for the unit.

The supports will be modified or replaced as necessary prior to Unit l's startup such that the requirements of Tech Specs 6.9.1.8.i are satisfied.

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