ML19224D828

LER 79-015/03L-0 on 790610:leak Identified in RCS & Traced to Isolation Valve.Cause Unknown.Isolation Valve Repaired & power-operated Relief Valve Declared Operable

ML19224D828
Person / Time
Site:	Millstone
Issue date:	07/09/1979
From:	NORTHEAST UTILITIES
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19224D824	List: ML19224D823 ML19224D828
References
LER-79-015-03L-01, LER-79-15-3L-1, NUDOCS 7907170092
Download: ML19224D828 (1)

Text

U. S. NUCL F AH REGUL A1 GRY COMA.11%hrJ J hC L 9Hf.i 3 a 17h LICENSEE EVENT REPORT cornnotntoco[ s l l } ] l u

l@ (PL EASE PRIN T OH TYPE ALL Hf GUMIE D INFOht.1 ATION) o ij [ C ] T l I1_j u l S l 2 ]@[0 jo l- 10L3LLN5l lo 1010 l- lo l010_j@[4 l 1 []_ [1 l 1_j@l l t, # ( A l 1,3 l@

bl>' PLH /> 2ts LICLL.l fift JU b 9 t lCL N i L O!DE 14 f5 covi 0 d $$ lLj@l0 l 5 l0 l0 JO_J3 l3 l6_ j@0 l6 Od (1 l1 10 [7 l9 l@{0_[7l0 E VE NT U Ali 14 l 's 9!7l9]@

HErDitT DAfL fa

1. 3 CJ L1 U DC t, E T f;U'.' _ , H tvenT oEScHmllON AND PhOa AM CONSf uuCNCLS @

O 2 During steady state power operation, a leak of unknown origin in the Reactor _i

[

O q[

Coolant Systeu in excess of 1 Gril was identified in containment. The plant was l

n .

[

plcted in cold shutdown in accordance with the Action Statement of Technical F5TC) 1 Specificction 3.4.6.2 and the leak traced to an isoletion valve, 2-RC-405, for one j

[Tpq l of two po'.;er operated pressurizer relief valves. As a result the power operate ' ]

gl relief valve, 2-RC-404, was declared inoperable in accordance with Technicul Speci- l griq L fication 3.4.9.3.G. The isolation valve, 2-RC-405, was then repaired. l CAUS C O Y P. VAlVF SYSTE'A CAU5L SU0 CODE SueCocE COCL CODE .UacoDF COYr0*.LN1 COD 1019t: I C ] B l@ [E]@ l B j @ [V l A l L l V l E l X j@ lE @ [D _

IJ 49 20 _

j@

10 t/ T3 7 9 11 IdV320N SEOUEN11AL OCCUHhtACL Htf0HT CO M 1YPE f* 0.

([ g ,ng

,IVLNT YE AR H L PDH I NO.

.

28 29 JJ 31 3?

,,_ 21 21 23 24 26 27 L it. P '. , 1 Ht h T tr A 1O O FL T r T C HOUHS Sub I i f ? It F f U@lz l@

33 M 1, A l@

J5 lJoA l@ (0l1l0 J/

0 43

[ f(j @

41

[L@ lAl@

4) 43

[V 44 0 l8 lS l@ 4p CAUSE DESCHWHON AND COHHECTIVE ACTIONS h i o l The valve leakage issued frerL th e body to bonnet seal. The valve,2-RC /0S, is a [

ggl 21/2 inch pressure seal gate valve with a notor operator, rated at 2500 PSI, ASME [

Ill, Class 1, SA-182 stainless steel. The valve gasket end spacer ring were replaced; g , ; ;,g i and the valveput igck into service. The power operated relief valve was then also j

, 3 l j

i i j g, j ] declared operable, 7 8 9 , P.'E T HOD OF F /+ Cit iTY OTHF R ST AT US DitCOV 5. H Y DISCOVUtY DESCHIPTION 32

$TATUS %FOWEH

[A,j@l Leakacie Calculated l

[_i_lij I F l@ l O l 91 5 @l NA l

,

Atie v !Y CO IlNT LOCATION 0F HELE ASE Ftl LE ASE D OF Hlli > J A'.900N T OF ACTIVITY HA l liIcl Z l @ Llj@l NA I I _

FEf tSON*1E t f XPC (E S NUYa C Ft TYPE DE SChiP flON NA l i i l 0 l 0 l 0 l@l z l@l 00 Pt n%ONNE L IN JU IES b uY Lii H O L SCH tP f lON l

7 i a 8 9 l0l0 0l@] 11 12 UA LOis or 04 U A*.' AGE T O F ACill T Y -

TYPE DL5CalP r ION NA m 0 %r 7907170 l li l H UI I U !@lto C'

' ' ' ' "

CO 1

12iol 15SUt HIPilON Yl r@I Ll press telea y _1100. .lun, 10. 1071 1 o ce IIIIIIIIIIII}{^ u.-

/ 8 9 10

, - -  ?