ML19270H365
| ML19270H365 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 06/20/1979 |
| From: | Brown S VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| 409A, NUDOCS 7906270222 | |
| Download: ML19270H365 (2) | |
Text
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VIRGINI A ELECTRIC AND POWER CCMP ANY, ABOMMOND, VIRGINI A 23261 June 20, 1979 Mr. James 3 0tei!1v, Jirector er'al 10. " 'm Sffice 37 I,scection & Inforcement 9SBC '%5:,ac:nnq
'J. S.1oci?ar hgulatory Cc miission hqion !!
lock at h.30-129 101 'darietta Street, ~ui ta 3!00
\\t'inti, laorni: 3030'
' lear :*. l'Ra4? N:
1 J' "ay 21, l'"O, a reoort was made un1er the orovisions of 'XR"O.:W) concernirq overweight motor coerated vi!ves 3n the accutuistor disc *ia-:a ifnes.
Th!s was followeo tv a five 1av recort on May ?a, '?71, under the 3-ovisions of 10C7"1 s t.'tinq th1t t59 act ui veir t li t*a t" ee " motor aceratad valves (cne 09 t"a disch1*';9 0'
?107 of t% thrae iccJmI1 tors in the safety inj etion system) is greater *.han that used by Stone L 'hoster in their original cipe stress inalysis.
It was costulat.3d that this error could rasuit in overstr?ssed oicing under e-tain seismic loadirq conditions.
Stone t Webstea has comoleted the aviev of the effect of changing the saioht of the Valan/'lestingnouse sucolied valves lidentified as 12G953FJH) from 3050 counds to 3':0 counds.
The task -ocuired 3 -oana'ysis F -5c?3
' lass 1 cine stress cro>lems and a ?vis of tu revised 101dirns ca t5e 9 0e 4
sucocrts, reactor conlant 1000 nozzles, accumulator tank nozzles, and the icCumulator tank SUDoortinQ structur ?.
All cioe stresses 3-9 within the 3c311 cable AS"E allowaoles.
'Ne r? vised reactor coolint 1000 aor:le IWs 2nd accumul3 tor tank '97:!a l 3ds were transmitted to Jestingrouse and.iatarmined to Se accentyhle', is.,
e risti10 civ - Jocort designs wra -ayinwe ; aging pg n o,,
gg, y
.nr[ E r t was necess 3ry to raset tn-9, nf t3 2 3374,1 urner;.
~his ria?4 "en c0r'oieted. 3nd no other mo.fificationS t3 Mistico succorts ca requi*ed.
.19 3ccumulator tank succorts, in 3*W fesign,.,979 3)3g',,yggge4 and determined to u W quate, r' a li es invn:ved we-e originally sub'octoi to a c'pe bre?'< inalysis.
I1Ch lire was ecneCkad h"ed upn Our elm "ocMet91 aD7PoaC5 shic'1 deter'9i ned bre1k 10 cations Sv stress level.
This rupture review indic1ted that no additional araak coints were create'1 ini 70 modification of existing
-estriints was necesstry.
2342 345
[, h @- >w@ @ p uy y kn ] l 6
qo r
7906270 $
'4r. James P. O'Reilly, Director
?
This reoort shall be considered our final report under the orovisions o#
10CR 50. 5 H ei.
Should you require further information, clease contact this of' ice.
Very truly yours, I(ih' Sam C.'Dr,own, Jr.
Senior Vice ? resident Dowa" Station i
Enginaecing mi Construct on ec:
'd. John G. Davis, Acting Directer Office of Inscection L Enforcement
' *r. Harold R. Denton, 'Prector Office of Nuclear Reactor Regulation 2342 346
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