ML19318A632

RO 50-321/1980-055:on 800531,snubber 36 on X32-1F7,1-inch Instrument Line from Recirculation a Loop,Appeared Locked Up During Visual Insp.Caused by Snubber Corrosion.Snubbers Failing Surveillance Test Will Be Replaced Prior to Startup

ML19318A632
Person / Time
Site:	Hatch
Issue date:	06/02/1980
From:	Manry M GEORGIA POWER CO.
To:
References
NUDOCS 8006230522
Download: ML19318A632 (2)

Text

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' 'A T L A !! T A , CEORGIA 30303 /f 3 J1L J E C T : H wt ch t'n i t 1. Docket No. 50-325. flot i f i c a t i nn of Reportabic Occurrence No. 50-321/1930-0$$.

MOTIFIED: Mr. Paul Shemanski "A7E: 6-2-D'I DATE: 5-31-80 TIME: 1735 EDT -

TIE S C R I P T I ON OF REPORTABLE OCCURRENCE .

YnItIn1 rnn:*iticn U IIII~ IInit T7Fco l d shutanwn, a rando- visumi inepection or ,

a c t.* a n i h t e feutside dryvell) mechanical snubbir* nn safety )

• rte-s use being performed as per site ecmcittment in l '. R ti o . l 50-373'1480-021. (Site committed to do a random v i r. u a l inspection cf accessibic fontside drvwc111 mechanical snuhbe:s on esfety systema b ,v P-1-80.)

Nature of Ocrurrence

& YITUaMiiIEc t i on being performed per surveillance required by MM d I-PG-2700 revealed t h .s t snubber 1.16 on Teo. # X17-177 ff" i n s t r ur-e n t line f r ot- Recirculatien "A" loop) appeared to be'

" locked up". Personnel then removed one end of snubber F r o ta itn point of attachment and attempted to manually stroke the unubber; it would not stroke. The snubber was then removed

- Pervir- nnd tchen to shop and placed on snubber test

+= Land. There a force of up to 1500 pounde was applied to the

- enubber in both the EXTENDED and RETRACT directions (750 pound snubber) and the snubber did not acve. This verified that the up".

gnubber was "Incked Sibsequent visun1

. inspections and manual attempts to stroke othe: icechanical anubbers revealed that t h e. following anubbers T were also " locked up":

h 1)

• snubber # 5 on Iso. f 121-F23: 3/4" drain from 1B*l-F022c.

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. ') Snubber F 6 on Iso. 8 B21-F24: 3/4" drain from i' 1521-F022D. , ,

h' 3) Snubber 8 7 on Iso. 9 821-r25: 3/4" drain from 1831-F0233.

a) Snubbern # 34 and 35 on 1so.

• X32-IF6: 1" instrument

1. ' line f rose Reactor Reelreulation Pump A discharme.

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f 5) Snubber # 37 on Ino, d X33-1F5: I" instrurent line f r orn Reacter Recirculation Pump B flow. ,

c 61 Snubher # 3R on Iso. A X34-1116: 3/4" line to Scal Water for Reac t or Rec i rcul a t i on Pump A.

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All failed mechanical snubbers were manufactured by International Nuclear Safeguards. i Iu..ediate corrective Action R i , .. e Unit 1

I fe action was neither required vis s in c o T rT norShutdown, taken. no intnediate corrective

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THIL: investtaatton (cutting snubber apart)

• the cause of the snubbers being " locked up" wasrevealed corrosion in that tha enubbers.

Eupp!cecntal Corrective Action WrVeTT13nt safety e ofvs.I tha rcrainiU, rneehanical snuhbers on Unit I s y n t e rn a be completed and all that fail the I

surveillance will be replaced prior to startup.

I; Statun of Redundant or Backup Svntems There are no -redundant or backup s v s i: e m s .

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J u..s.t i f i e n t i o n for Continued Operation

.To n e - Unit I will not start up until all mechanical snubbers I

on safety systems have been inspected and all failed snuhbers have been replaced.

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