05000321/LER-1980-086-01, /01T-0:on 800724,w/Unit 1 in Cold Shutdown,Support P52-F512-H704 Determined Missing on Instrument Air Sys. Caused by Inadequate Small Bore Piping Design.New Hanger Design Supplied & Support Installed

/01T-0:on 800724,w/Unit 1 in Cold Shutdown,Support P52-F512-H704 Determined Missing on Instrument Air Sys. Caused by Inadequate Small Bore Piping Design.New Hanger Design Supplied & Support Installed

ML19330C387
Person / Time
Site:	Hatch
Issue date:	08/04/1980
From:	Coggin C GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19330C383	List: 05000321/LER-1980-086, Forwards LER 80-086/01T-0 05000321/LER-1980-086-01, /01T-0:on 800724,w/Unit 1 in Cold Shutdown,Support P52-F512-H704 Determined Missing on Instrument Air Sys. Caused by Inadequate Small Bore Piping Design.New Hanger Design Supplied & Support Installed
References
LER-80-086-01T, LER-80-86-1T, NUDOCS 8008080310
Download: ML19330C387 (2)

LER-1980-086, /01T-0:on 800724,w/Unit 1 in Cold Shutdown,Support P52-F512-H704 Determined Missing on Instrument Air Sys. Caused by Inadequate Small Bore Piping Design.New Hanger Design Supplied & Support Installed

Event date:
Report date:
3211980086R01 - NRC Website

text

u.s. NuctEAR REGULATORY COMMISSION

)

anc PoauIss.

377)

LICENSEE EVENT REI' ORT p - 60NTRol block: l l

l l

l l

l (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) 1 6

lGlA'lElIlHlIl@l010l-1010101010l-1010l@l4Il1111(1l@l l _l@

( /

9 7

8 W LICENSEE CODE 14 IS LICENSE NUMBER 25 26 LICENSE TYPE JO 57 CAT 58 0 t "fR% Lx_j@l 01510 l 010131211 l@l01712 I4 I8 l0 l@l018 l0 l4 l8 l0 l@

' con'T A

68 69 EVENT DATE 74 75 REPORT DATE 80 60 61 DOCKET NUMBER l

7 8

EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h coolers, a review of I lWith Unit 1 in cold shutdown for repair of drywell 0 2 g taj Idata. for IEB 79-14 by the AE revealed that a support (P52-F512-H704) wasl integrity could!

Imissing on the instrument air system and that the piping O 4 IOlsi Inot be assured in a seismic DBE.

Piping failure would have rendered 8 l

10181 Ivalves for post-LOCA hydrogen ventina of the containment inoperative.

1 This is a repetitivel IThere were no effects on public health and safety.

0 7 I

levent; see LER 50-321/1979-065.

O 8 E

CODE

$ SC E COMPONENT CODE SU8 CODE S

ODE Q

l P l A _l @ [B_J@ l Al @ l S l U l P l 0 l R l T l@ W@ [Z_J @

7 8

9 10 11 12 13 18 19 20 REVISION SEQUENTIAL OCCURRENCE REPORT EVENT YEAR REPORT NO.

CODE TYPE N O.

@,aj,g/RO 18 l0 l

[-j l0 l8 l6 l y

l0 l1l lT l

[-j l0l LER 23 22 23 24 26 27 28 M

30 33 32 KN A T ON O PLA T MET HOURS S8 TE FO id B.

SU PLIE MA F CTURER [X__j@[Z_J@

LZ_J@

lZ l@

l 0l 0l 0l 0l [Yj@

l N l@

W@

lB l1 l3 l0 ]@

33 34 3S 36 3

40 48 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS IThe' initial small bore piping support design was done using the cookbooki

)

i O This supoort was not in-1 lilil Imethod and did not rely on computer analysis.

1sta11ed due to an error in implementing this method of design.

A new I

i,

ihanger design was supplied by the AE.

The new hanger was installed I

a I

m Iprior to startup of the unit.

80 7

8 9 ST US

% POWER OTH(R STATUS 15 RY OtSCOVEFY DESCRIPTION

@ [G_J@ l010 l0 l@l NA l

l Di@l Notification from AE l

A TiVITY CO TENT LOCATION OF RELEASE LZ_j @ [Zj@l NA l

l NA l

RELEASED OF RELE ASE AMOUNT OF ACTtvlTY i 6 PERSONNEt ExPOSUAES NUMBER TYPE

DESCRIPTION

j 10l 010 l@LZ_j@l NA i 7

' nRSO~NEl'iN,ULS OESCRirTiON@

l NUMBER 10101 ol@l NA i a 80 7

8 9 11 12

'#5,$

SCR,%' '"" @

l

' " '"^

E NA Q @l 9

7 8 9 10 NRc use oNov 80080so p C3

,SSE[ t'lSCR, TION @

NA l

lllllllllllllj L 8l 2 a 68 69 80 5 7

8 9-10 912-367-7781 i

m mm

i, O

N ll ll LER f:

50-321/1980-086 q

Licensee:

Georgia Power Company 1

Facility Name:

Edwin-I. Hatch Docket #:

50-321

Narrative

Report for LER 50-321/1980-086 On 7-24-80, the site was notified by the AE (Bechtel) that a

- support was-missing on the instrument air system.

This missing support (P52-F52-F512-H704) was discovered during a review of field data for IEB 79-14.

At the time of discovery Unit I was in. cold shutdown for repair of drywell cooling fans.

Computer analysis indicated - that while the piping and support arrangement was safe for normal plant operating conditions, the ' code allowable stresses would be exceeded for an OBE - seismic event, field stresses would be exceeded for a DBE seismic _ event, and piping integrity could not be assured in this case.

Failure of the piping would

cause

loss of operability of. valves T48-F332A&B, F333A&B, F334A&B, and F335A&B used for post-LOCA hydrogen venting of containment.

These valves could be operated manually if required.

Prior to startup the missing support was per an AE supplied design.

There were no effects upon public health and safety.

This is a repetitive event; see LER 50-321/1979-065.

i P

a 4

e