ML19209B299

LER 79-028/03L-0:on 790904,hydraulic Snubber Located on Main Steam B Atmospheric Dump Valve Found Inoperable.Caused by Broken Snubber Reservoir.Snubber Replaced

ML19209B299
Person / Time
Site:	Millstone
Issue date:	10/01/1979
From:	Crockett J NORTHEAST UTILITIES
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19209B297	List: ML19209B296 ML19209B299
References
LER-79-028-03L-01, LER-79-28-3L-1, NUDOCS 7910090466
Download: ML19209B299 (1)

Text

'

LICENSEE EVENT REPORT cONTHOL DLOCK: l

• l l l l l l lh 6

(PLE ASE PRINT OR TYPE ALL f tLQUlHED INFORMATION) l o l i. I I q 1 t'l NI SI al@[ 0 l 01 -l 0 LICENst 14 e l 01010NuvuiH l - 10 l 0J@l 25 41 1LICLt.st 26 L1_I_11 i l@lsi car l Su IQ d 9 LICLN5f.E COT)E 15 i Yet JJ covr o i 3

s

,gnT l Llgl 0l 5l 0 0l 0l 3l 3 l 6 l@l 0(d] 9 l 0 l 41719 74l@l1 60 61 DOC K E T N U'# E H Id EVENT DATC h 0l0lll7l9l@

HEPOFlT DATE B3 EVENT DESCHIPTION AND PROD AOLE CONSEQUENCES h o ,, l During routine power operation, a hydraulic snubber located on the B main steam I o 3  ; atmospheric dump valve was found to be inoperable. The fluid reservoir had been [

g 4  ; broken off the snubber. The faulty snubber was removed and a replacement unit [

o 3 ; ins tal led . Facility operation was in accordance with Technical Specification 3.7.8.1. [

g g  ; Snubber - Hanger 405388, ITT Grinnell, Fig. 201, 2 1/2 inch bore x 5 inch stroke. I o 7 I I O 8 l  !

ScS'o'E '880E S

50s^cS5E CO:.sPO: ANT cooc St,f ac 5$r seer O 9 9

al Bl@ l Al@ [F_j@ l SI Ul Pl 01 Rl TJ8 LoJ8 LzJ @

10 7 8 11 12 13 la 'O 20

_ SEQUENTI AL OCCURRENCE HErORT HEVISION LER RO EVENT YEAR HEPOR T NO. CODE TYPE NO.

@ g.og 71 4 l-l I 01 21 81 1/l I O 3! l30 Ll [-] [0_j

_ 21 22 23 24 2ti 27 23 29 31 32 T KLi A YO ON PL PT PIET i HOURS SUB i F 1 S. PLil P. A' F 1 iEH 33 Clgl34X l@ l Z jg 35

[367. l@ l 0l 0l 0l 01 3/ 43

[t!J@

41 W@ lAl@ l Il 2 l 0 l7 l:

42 43 44 47 CAUSE DESCHIPTION AND CORRECTIVE ACTIONS h

[i i a l The snubber reservoir was inadvertently broken off by contract insulators during i ii i [ reinsulation of a steam line in the vicinity. Snubber replaced. The periodic snubber I

,, ,  ; visual inspection frequency will be increased to a 12 nonth frequency per Technical j p, 3 l Specification Table 4.7-3. g i 4 I I 7 8 9 E0 ST .'OWER OTHE R STATUS ISC F DISCOVEHY DESCRIPTION i s l E g i . l 0 l 0 ]gl NA l l B lgl Operator observation l A!Tivir co'EtNT tOcAnONO,neuASc@

7 i c muYm Or nYusE P 9 LJ @ L_J81 to 11 mOuNr ' Os AenviTv 44 I

45

@ I N^ _

i 83 PERSONNEL FXPOSURES NUr/B E R TYPE DF SCHIP TION i >

1 01 01 Ol@L zJ@l Na I

' ' ' ,E n SOm a',N,u',?,ES NUveEn otSenienON@

i -

7 8 9 1 01 01 Ol@l 11 12 NA l P.O L O',S OF OH D AYAGE TO F ACIL1TY 43 lIId )

lilalLZj@l T Yi' E DE SC HIP TION v NA l l l ' C[f/

I J B 9 10 00 17 l 'etzo[" 791009046( ""C"3' "'Y i B 9 l I Zl l@o?lcn,rnON @

10 NA [

C tl 09

((ll L((fIllllr; LU !

, . J. O. Crockett , . . 203-447-1791 i