ML20127L289
| ML20127L289 | |
| Person / Time | |
|---|---|
| Site: | Monticello  |
| Issue date: | 08/28/1975 |
| From: | Iverson O, Mayer L NORTHERN STATES POWER CO. |
| To: | Anthony Giambusso Office of Nuclear Reactor Regulation |
| References | |
| LER-LER-750828, NUDOCS 9211230483 | |
| Download: ML20127L289 (2) | |
Text
. _.
/'85,
"[.
NORTHERN STATES POWER COMPANY j
M I N N E A PO L.d S. M I N N E S OTA 95401 Y
,=..
Tegtilaldry' N' N' s'
August 28, 1975 by 8 Rg g
SEp p 5
\\(/[Q{
k Mr A Giambusso, Director U.
Division of Reactor Licensing-U S Nuclear Regulatory Commission Washington, DC 20555 N
4 y
Dear Mr Giambusso:
N FONTICELLO NUCLEAR GENERATING PLANT Docket No. 50-263 License No. DPR-22 Licensee Event Report to the NRC Failure of RWCU Pump Seal Water Line The Licensee Event Report for this occurrence is reproduced on the back of this letter.
Yours very truly, h.
W L 0 Mayer, PE Manager of Nuclear Support Services IDM/DbN/ak cc: J G Keppler G Charnoff MPCA Attn: J W Ferman b
a.
9267-9211230483 750828 gDR ADOCK 05000263 PDR
-over-
LiGENSEE EVENT REPORT
~
cONTROt eLOCNI_ l l
I l-l l
puAsc e:wr Au caruma mr::maresi 1
6 Yv$g NAME
@ lM lN lMl Nl Pl 1l _
tcENSE NuMDEn tv l0 l0 l-l 0 l 0l 0l 0l 0l-l0 l 0 l l4l1l1l1l1l l0l1l 7 89 14 15 25 26 30 31 32
[vE SYun!E DOCKEY NUMBER EVENT Datt-Ripont DATE C AT E GORf
@ CON'T l M l I l lL-l l 0 l 5101-10l 216l 3j l0 l8 l118 l 7l Sj 10 l8-121617151 7 8 67
$8
$9 60 61 68 09 74 75 80 EVENT DESCRIPTION
@ l During normal plant operation, a threaded nipple in section of 1/2" seal water line l
7 89 80
@ l between #12 RNCU Pump and seal water heat-exchancer failed at thread root.
System wasl 7
89
$ l immediatelv isolated No nrevious similar failures. Affected narts renlaced in kind. l 80 7 89
@ l Invest ientine nossibility 80 7 89 nf renlacinn ninn with tubinc.
(A0 263/75-141 l
hl 80 l
7 89 p%g 80 fE Yo$f C
COMPONf NT CODE R
M NtJF 18 A VOLATON
@ lcl cl Ln)
I el 11 pl Elx lx l L1J l II 0171 sl LLI 7 89 10 11 le 17 43 44 47 48 CAUSE DESCRIPTION
@ {_ Stress induced in pipe at fitup. Vibration and concentration of stress in thrends l
7 89 80 EE l resulted in faticue failure of nine.
A ffor t rei nnrts ron1nced in k i n -1.
pino - 1/?"
l 7 89 DE [ AISI Type 304, Schedule 80, seamless 80 l
7 89 FaciuT v MfTH00 0F STATUS
% POWE4 OTHER STATUS D!SCOVE RY DISCOVE RY DEStrupTON l 0l 6l 4l l N/A l W l
NA l
7 8 9
10 12 13 44 4b 46 80 AC TIVIT Y CONTENT AELEASED OF HE LE ASE AMOUNT OF ACIMTV 3
[_GJ l_NJ l 0.7 curies total l
l Reactor Buildine. Vent to Atmosphere l
LOCATON OF AELEASE 7 8 9
10 11 44 45 PERSONNEL EXPOSURES 80 NUMBER TYPE DESCruPil0N
@ l 0l 0l 01 Wl NA l
7 89 11 12 13 80 PERSONNEL INJURIES NUM BE R DE SCArDTION DG l 0l Ol 0l lNA l
7 89 11 12 OFFSITE CONSEQUENCES I
@l NA 7 89
__l LOSS OR OAMAGE TO FACluTY 80 tVPE DE SC A6FTiON DE Lij l
NA l
7 is 9 10 80 PUBUCIT Y DE I NA l
7 89 80 ADDITIONAL FACTORS DG 1 NA 7
89-l-
Bo DE I
-7 80 l
s.
80
- * ~ '
2
- NAME:-
O M_
Ite enn 612-295-5131 pH GPO $48 667 k[
- 1
.