ML19268C169
| ML19268C169 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 11/06/1979 |
| From: | VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| To: | |
| References | |
| NUDOCS 8001030516 | |
| Download: ML19268C169 (1) | |
Text
._____._.-.- - -
Virginia Electric and Fcher Capany 1ortn Anns P:'ar a Staticn, Unit 91 NFF-4
,' Decket b. EO-330 24 Mcur Reportable Event f licitten Follt.w-Up
[1 h
3 Event: Iccorrect f aisnic Respensa spectru Cur.e Used d
in a Pips Stress Analysis LER/60 79-15)/01T-0 i
During 'the revi(w of valve keights in cen[urcticn with the as-tuilt' reviu of IE Eulletin 79-14, it was discovered that an incorrect geisnic respcase i specteta curva nxd been used in a pipe strass analysis. Review of the selmic i input to other stress prcblic.s ra,realed that sc a othar seis,.ic curve:; had ust.d the wrcng input for:.at.
.The cause of this discrepancy is r.ot knc n at this tiu.
An investigstion of tre extent of tta problen is in prcgrass. This in w -
tigaticn has sit. n that sc a of the strass analyses for ec Eccur.t ccaling. suc. ..
. kater, ar.d other safety related systa. s used incorrect seistiic f nput whicn eculd
'. have yieldad ir.ccnservative pipa stresses pipe support loads, ar.d equip . ant im e Ncne cf the deficier.cias founo were 1ccated in the contaire, ant tu11dico n.n kere any a part of the reactor ecolant pressure tcundsry. Cr.e of the strets analyses in tt:e Auxiliary Euildir.g has tun run with the correct seliale curva
- and resultad in a calculated pipe stress atove the allcatie stated in the FDn.
- The unit is presently in a refueling shutdt,wn r.cds.
I U Cc O Ii2 a s,P.01g uY
$ C *g
'# cn Ao a g, g. UP#GW t. _
- 3,9.CHEMDES O i
. s, a, ** T d i & k WG g, putMff ..
i t, suTMM 'U
, g
' C cr: f,, -
s ll E Y J .
0 q
r 6
' " ~ ~ ~
' - _ _ _ _ _ _ d' ~-
8001030 C/6
. 3