05000321/LER-1980-062-01, /01T-0:on 800612,w/Unit 1 in Cold Shutdown, Investigation Was Begun to Determine Cause of Pavement Deflection Which Occurred Beneath Crane Outrigger Pad. Caused by Improper Compaction of Localized Area

/01T-0:on 800612,w/Unit 1 in Cold Shutdown, Investigation Was Begun to Determine Cause of Pavement Deflection Which Occurred Beneath Crane Outrigger Pad. Caused by Improper Compaction of Localized Area

ML19326D776
Person / Time
Site:	Hatch
Issue date:	06/25/1980
From:	Coggin C GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19326D773	List:
References
LER-80-062-01T, LER-80-62-1T, NUDOCS 8007030286
Download: ML19326D776 (2)

LER-1980-062, /01T-0:on 800612,w/Unit 1 in Cold Shutdown, Investigation Was Begun to Determine Cause of Pavement Deflection Which Occurred Beneath Crane Outrigger Pad. Caused by Improper Compaction of Localized Area

Event date:
Report date:
3211980062R01 - NRC Website

text

I U.S. NUCLEAR REGULATflRY COMMISSION NRC FORM 366 l(7 77)

LICENSEE EVENT REPORT coainot block:

l l

l l

l (PLFASE PRINT OR TYPE ALL REQUIRED INFORMATION)

~

l G l A l E l I l H l 1 l@l 010 l-1010 l0 l0 !0 l-10 l0 l@l4 l1 l1 l1 l1 j@l l

l@

o i 7

8 9 LICENSEE CODE 14 15 LICENSE NUMULH 25 26 LICEN5E TYPE Ju bl CAT td con'T 3M l L ]@l 0 l 5 l 010 j 013 l 2 l1 l@l016 l1 12 l 810 l@l0161215l810.l@

o i 74 75 HEPOHT DATE 80 7

8 t,0 61 DOCKET NUMBEH tal 69 LVENT DATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h lWith Unit 1 in cold shutdown, an investigation was begun to determine

[

o 2 QL3_l Ithe cause of pavement deflection which occurred beneath a crane outrig-1 Iger pad at the intake structure.

The investigation revealed a settling i o 4 tof fill material under the service water and RHR service water lines.

I O $

lo lc i lRemedial action will be required in order to comply with FSAR compactioni 1

0l7ll requirements.

There were no effects upon public health and safety due i

i I

lto this event. This is not a repetitive occurrence.

o a DE COCE St BC E COMPONENT CODE SUBC D'E SU DE 12 l Z 1@ Lxj@ l x i@ I zi zl zl zl zl zlO Lx_J@ LXJ @

o 9 7

8 9

10 11 12 13 18 19 20 SEOUENTI AL OCCURRENCE REPORT REVISIUN EVE NT YE AR REPORT NO.

CODE TYPE N O.

O s=E R/RO l 81 ol 1-1 10 16 12 1 M

10111 lT I L _]

W L

a

_ 21 22 23 24 26 27 28 29 30 31 32 KEN ACT ON ON PL NT MET HOURS 22 SB IT FO A B.

UPPLIE MAN FACTURER lXl@lXl@

lzl@

[_zj@

10 l0 10 l0 l lYl@

lNlg lzj@

lz l9 l9 l9 lg 3J 34 35 36 37 40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h i O IThe cause has been determined as improper compaction of a localized area l li li l limmedi a tely in front of the intake structure.

A substantial depth of I

lbackfill was compacted in this area.

Difficulty in originally compact-I i 2 lTITl l i ng o f the b a ck fill appears.to have caused the problem.

Corrective I

laction will be determined after the problem's scope is determined.

l i 4 80 7

8 9 Y

% POWE R OTHER STATUf is FY DISCOVE RY DESCRIPTION

(_Gj @ 10 l 0 1 Ol @ l NA l

lC l@l Geortechnical Investigation l

i 5 ACTIVITY CONTENT REL E ASED OF RELE ASE AMOUNT OF ACTIVITY LOCATION OF RELE ASE L.zJ @ LZJ@l NA l

l NA l

i 6 7

8 9 10 11 44 45 80 PERSONNEL E XPOSUHES NUMBER TYPE DE SCRIPTION l 0l 0l Ol@l zl@l NA l

i 7 PEHSONNEL INJU IES NUYDEH

DESCRIPTION

l0l0l0l@l NA l

i a 80 7

8 9 11 12 TOSS OF OH DAMAGE TO FACillTY TYPE DE SCHIPTION

[_ zj@l NA l

i 9 80 7

8 t 10 E SCnsPTION CSSSUEL 81 NA l

1IlllllIIIllli 2 o 8 0'0 7 6'n o J_dT

'l r I rnnnin sont p1t Fno. Sory, 917-36W-7781 a

m m..e

i LER f:

50-321/1980-062 i

Licensee:

Georgia Power Company Facility Name:

Edwin I.

Hatch Docket #:

50-321 L

Narrative

Report for LER 50-321/1980-062 On 6-12-80, with Unit 1 in cold shutdown, an investigation was begun to determine the

cause

of pavement deflection which occurred beneath a

crane outrigger pad at the intake structure.

,The investigation involved excavation of the pavement and the ground beneath until reaching the service water lines below.

There was no damage done to the Unit 1 or 2 service water (PSW) or RHRSW piping in this area.

The investigation-was continued further and revealed two 1.

the separati.on of fill from underneath the problems: _

2.

existence of a

temporary pipe support used

piping, and during construction which.should have been removed then.

This temporary support has been removed.

Presently, a testing plan consisting of numerous soil samples from bowings at the intake structure is underway.

The A/E is assisting 'in the investigation and in determining a proposed correction to the problem.

'An acceptable resolution will be initiated once the results of the investigation are in and the appropriate course of action has been determined.

An update to this report will be issued.

W