ML20010B801
| ML20010B801 | |
| Person / Time | |
|---|---|
| Site: | Fort Saint Vrain  |
| Issue date: | 10/19/1977 |
| From: | Brey H, Frost R, Hillyard H PUBLIC SERVICE CO. OF COLORADO |
| To: | |
| Shared Package | |
| ML20010B798 | List: |
| References | |
| FOIA-81-95 RO-77-34-(30), NUDOCS 8108180102 | |
| Download: ML20010B801 (3) | |
Text
i 1
4 kEPORT DATE: __0ctober 19, 1977 REponTMII OCCURRENCE 77-34 OCCURRENCE DATE:
'SepIember 19, 1977
{
FORT ST. VRAIM NUCLEAR CENERATING STATION PUBLIC S'
/ ICE C02:PANY OF COLORADO
- i. :
P. O. BOX 361 PLATTEVILLE, COLORADO 80651 REPORT NO. 50-267/77-34(30)
Preliminary IDENTIFICATION OF OCCURRENCE:
On September 19, 1977, a number of errors were found in the seismic supports for portions of Class I, field run, two inch and under piping systems. This event has been identified as a reportable occurrence in accordance with Fort St. Vrain Technical Specification AC 7.5.2.b.3.
EVENT DESCRIPTIOM:
As the result of the review of seismic systems and equipcent that was per-formed following discussions with the Nuc1 car Regulatory coznission in May, l
1976, it was necessary to review the piping system support design for those portions of systems or equipment that were revised from C7 ass II to Class I s tatus.
This revision from Class II to Class I resulted in field checking l
appro:cimately 500 isometric drawings that defined the affected portions of
(
two inch and under piping systems in the plant.
These isometric drawings serve as the basis for Fort St. Vrain piping seismic certification.
t The re-f sults of 'he field check of these 500 isemetric drawings indicated that in addition t + the piping support revisions ' required because of Class I boundary l
extensions, other errors in the supports of the existing class I portions l
of the pipit.g syste=s also existed.
{
lowing eneral categories:
The errors identified fall into the fol-
- 1) }Hssing hangers
- 2) Improper hangers used in the installation
- 3) llangers not located in the proper location
- 4) System piping configuration does not agree with the isometric drawings CAUSE DESCRIPTION:
The cause of the errors in seismic support for some Class I, two inch and under piping systems has been identified as inadequate implementation of the Quality Assurance Program during the construction phase..
~
LIVEDALE81-95 PDR g
-rv-'
"W
l' r-f I
/
i
~
REP RTABl.E OCCURRF.NCE 7 7-3'.
5 Page 2 of 2 CORRECTIVE ACTION:
A pro [r'am has been instituted.to evaluate the scismic supports of Class 1, two inch and under piping and to provide corrective action as required.
'Ihe licensee's Quality Assurance Department will insure that the program con-tinues until complete.
A supplement to this report will be issued when the corrective action has been completed.
q
/
.(q. 'G,'%
Prepared by:
/.h..v /.v.
. /*.-f Richard R. Frost Technical Services Technician ~
s Reviewed by:
L
'fYi
(, m
<'3 H. E. Hillyprd, Jrg' Technical Services Supervisor Reviewed byh U*
a H. Iarry Brcy Superintendent, Operatiqns I
Approved by: _[redericE.Suart M
t,,a' '
,oo r
Nuclear Production Manager l
...-__-_-r
-,v, ie r.
,m-.
.~---,.,e
--,rw.7
(
I
~
LICENSEE EVENT BEPORT CONTROL DLOCK:l l
l l
l l
l
[ptEASE PRINT ALL REOulRED SNFOAMATION) 1 L
6 4
a E
'tcENst NuMain yPE T PE
[5E I Cl ol vis I'v lij 1 o 101-1 olo lo lo lo 1-101 1 1411 11121o1 10131 7 89 14 15 25 26 30 31 32 OAT E GORY P
U DOCKET NUMDEA EVENT DATE REPoAT DATE O 1 CON 7 l } I' {LJ
[.LJ l o I 5 l o l-l o l 2 l 6 l 7l lo l9 l1 l9 l7 l7 l. l1l o l1I 9I 7l 7l 7 8 57 58 59 60 61 69 69 74 75 80 EVENT DESCA!PTION 35 l As the result of review of seismic systems and equipment that was performed following l 7 89 80
$ l discussions with the NRC in May, 1976, errors were found in the supports of portions ofl
~
7 89 80
$ l Class I, two inch and under pipinn.
Errors identified fall into the following general l 7 89 80 SE l categories:
- 1) missing hangers,
- 2) Improper hangers, 3) Improper hanger location, l 7 89 80
$] 4) System not like drawing.
(Ro 77-34)
I 7 09 80 pg i
- $EE
$0DE c
COMPONENT CODE S
A M
F A
vuAnw
@E lZlZI d l Hl AlN lG l E l Rl W
IZ l 9l 9l 9l (NJ 7 89 10 11 12 17 43 44 47 48 CAUSE DESCRIPTION DE lThe cause of the errors in seismic support for some Clar s I, 7 a9 two inch a'n'd under piping ' l 80
@ l systems has been identified as inadequate implementatica of the Quality Assurance pro-l'
- 7 89 80 06 hram durinR the construction phase.
'7 89 80 SYa$
% POWER OTH:A Si***
OISCOVE D:SCoVERY DESCARTON 8
Lzj lo I319 I I N/A l
(_CJ lN/A 7 C 9
10 12 13 44 45 46 80 ACTNTTY COSTENT ret EAsto or attraSE
. AMOUNT or AcTMTV LOCATON OF RELE SE 00 l_Z.lj
{Zj i
N/A l
I l
N/A 7 8 9
10 11 44 45 80 PERSONNEL EXPOSURES tiUvetR TYPE DE SCR. A TON DE 10101 of LZj lN/A l
1 7 89 11 12 13 80 PERSONNEL INJUR:ES
.I Nuuatn otScastCN DE lo l o l ol 1 N/A i7 C0 11 12 80 OFFSITE CONSEOUENCES
, [31 IN/A
!7 09 80 LOSS OR DAMAGE TO FAClulY TYPt DESCR# ION DElZj l N/A
- 7 G9 10 80 PUBLrE l N/A l
1
- 7 8g 80 ADDITIONAL FACTORS DE l n/^
l
!7 gg 80 1
EB l n
I
(
u,os, [ 4 f d, h v. sillyara, ar.
. [
,,oy,.
om nwg
~ ~
-,