ML19268C169: Difference between revisions

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| contact person =  
| contact person =  
| document report number = NUDOCS 8001030516
| document report number = NUDOCS 8001030516
| document type = REPORTABLE OCCURRENCE REPORT (SEE ALSO AO,LER), TEXT-SAFETY REPORT
| document type = REPORTABLE OCCURRENCE REPORT (SEE ALSO AO LER), TEXT-SAFETY REPORT
| page count = 1
| page count = 1
}}
}}


=Text=
=Text=
{{#Wiki_filter:._____._.-.-                -      -
{{#Wiki_filter:. _ _ _ _ _. _. -. -
Virginia Electric and Fcher Capany 1ortn Anns P:'ar   a  Staticn, Unit 91 NFF-4
Virginia Electric and Fcher Capany 1ortn Anns P:'ar Staticn, Unit 91 NFF-4 a
    ,'                  Decket b. EO-330 24 Mcur Reportable Event f                    licitten Follt.w-Up
Decket b. EO-330 f
[1 h
24 Mcur Reportable Event
3                     Event:       Iccorrect f aisnic Respensa spectru Cur.e Used d
[1 licitten Follt.w-Up h
in a Pips Stress Analysis LER/60 79-15)/01T-0 i
3 Event:
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.
Iccorrect f aisnic Respensa spectru Cur.e Used d
                                  .The cause of this discrepancy is r.ot knc n at this tiu.
in a Pips Stress Analysis LER/60 79-15)/01T-0
An investigstion of tre extent of tta problen is in prcgrass.         This in w -
$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
tigaticn has sit. n that sc a of the strass analyses for ec Eccur.t ccaling. suc. ..
specteta curva nxd been used in a pipe strass analysis.
    .                    kater, ar.d other safety related systa. s used incorrect seistiic f nput whicn eculd
Review of the selmic i
'.                      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
input to other stress prcblic.s ra,realed that sc a othar seis,.ic curve:; had ust.d the wrcng input for:.at.
    -                    and resultad in a calculated pipe stress atove the allcatie stated in the FDn.
.The cause of this discrepancy is r.ot knc n at this tiu.
      -                            The unit is presently in a refueling shutdt,wn r.cds.
An investigstion of tre extent of tta problen is in prcgrass.
I                                                                                               U     Cc O     Ii2 a s,P.01g uY
This in w -
                                                                                                        $      C *g
tigaticn has sit. n that sc a of the strass analyses for ec Eccur.t ccaling. suc...
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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 Ncne cf the deficier.cias founo were 1ccated in the contaire, ant tu11dico n.n e
          ;                                                          3,9.CHEMDES                               O i
kere any a part of the reactor ecolant pressure tcundsry.
                                                                  . s, a, **                             T     d i                                                           & k WG g, putMff                   ..
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.
i    t, suTMM                               'U
The unit is presently in a refueling shutdt,wn r.cds.
            ,                                                                                          g
I U
            '                                                                      C                  cr:  f,, -
Cc O
s                                                        ll E Y J                             .
Ii2 a s,P.01g uY C *g Ao cn a g, g. UP#GW
: t. _
3,9.CHEMDES O
. s, a, **
T d
i i
& k WG g, putMff t, suTMM
'U i
g f,, -
ll E Y C
cr:
s J
0 q
0 q
r 6
r 6
                                                                                      ' " ~ ~ ~
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                ' -    _ _ _ _ _          _              d' ~-
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8001030 C/6
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                                                                                          . 3}}
8001030 C/6 3
.}}

Latest revision as of 07:04, 3 January 2025

RO-79-151/01T-0:during Review of Valve Weights in Conjunction W/Ie Bulletin 79-14,discovered That Incorrect Seismic Response Spectrum Was Used in Pipe Stress Analysis. Cause Not Known.Investigation in Progress
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)
v • d • e


Text

. _ _ _ _ _. _. -. -

Virginia Electric and Fcher Capany 1ortn Anns P:'ar Staticn, Unit 91 NFF-4 a

Decket b. EO-330 f

24 Mcur Reportable Event

[1 licitten Follt.w-Up 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 Ncne cf the deficier.cias founo were 1ccated in the contaire, ant tu11dico n.n e

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 Ao cn a g, g. UP#GW

t. _

3,9.CHEMDES O

. s, a, **

T d

i i

& k WG g, putMff t, suTMM

'U i

g f,, -

ll E Y C

cr:

s J

0 q

r 6

' " ~ ~ ~

d'

~-

8001030 C/6 3

.

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