ML20086B195
| ML20086B195 | |
| Person / Time | |
|---|---|
| Site: | Fort Saint Vrain  |
| Issue date: | 10/31/1974 |
| From: | Mathie F, Swart F PUBLIC SERVICE CO. OF COLORADO |
| To: | Howard E NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| References | |
| AO-50-267-74-14, NUDOCS 8311170095 | |
| Download: ML20086B195 (4) | |
Text
p p
o v
N(
public Eiervice Comp:my CP Cchracb P. O.11ox 361, Platteville, Colorado 30651
. p, le'?
Yc h GI
"'Di' 1s ;p' y.
o.s.,,,$,yn 51,
(;
frv n
?'
31,1974I((Ehi[
/ /
October 4/ jg Mr. E. Morris llovard, Director Directorate of Regulatory Operations Region IV, USAEC 10395 West Colfax, Room 200 Denver, Colorado 80215 REF:
Facility Operating License No. DPR-34 Docket No. 50-267
Dear Mr. Howard:
Enclosed please find a copy of Abnormal Occurrence Report No. 50-267/74/14A, Final, submitted per the requirements of the Technical Specifications.
Very truly yours, Ashtslc. Obusd-Frederic E. Swart Superintendent Nuclear Production Fort St. Vrain Nuclear Cencrating Station FES:il s.
cc:
Mr. A. Giambusso hK00000267 95 741031 1"" CGn S
PDR 90PY SENr neo1on
l p
O V
v 11a t c :
Oct ght.nyft, 1974 ABNDPmL 0 :CURid:NCE l
TORT ST. YRAIll GUCLl:AR CENEl% TIT!G STATION PliBLIC SURVICE C0'PA'!Y OF COLOPADO P.O. liOX 361 PLATTF.VILLE, COLORADO 80651 PIPORT !!O. 50-267/74/14A Final IDENTIT] CATION OF GCCUf.1gt:CE :
Engine "B" of dieseJ-generation ser "A" failed to start during routine surveillance, July 29, 1974.
This in considered an abnorraal occurrence per section 2.1 (f) of the ' Technical Spccifications.
CONDITIO::S PRIOR
_TO OCCUPPI':CP.
- Steady State Pouer Routine Shutdown llot Shutdoun Routine Load Chcnge X
Cold Shutdown Other (specify)
_ Refueling Shutdovn Reactor in heliuri - cyyroyitrat cj Routine Start.up a tmospheri_cJrescttre The taajor plant parar.etern at the titae of the event were as follows:
Power
- PTR, O
MWth ELE CT,
0
._ MWe Secondary Collant Presnure O
psig Tetaperaturc 0
- f Flow O_
- /hr.
t Pritaary Coolant Pressurc 0
ps1R I
Tetapdrature _3_00
- F Core Inlet
__ 100
- F Core Outlet Flow O_ _
- /hr.
t
Pap,c 2 t
lirECRINIO:1 OF
.O.s__C1::.4_F"C.I_: :_
C- _ _.
On a routine siert durinn suivcillance tenting, enr.ine "li" of "A" dienel-gener ator cet can prevented fron st artint l'ecause the shutdown ne::unism, actuated by lou oil pressure or engine overspeed, had tripped.
AlPARE::T CAUSE
_ Unusual Service Cond.
Design OF OCCC'tCE::CI:.
Includine. Environment
!!anu f ac ture
_ Corponent Failure
~
Installation /Const.
~
X
_ Other (Specify)
Operator
._ Procedure Tolerances in the shutdoun ncchenism are such that a trip, as that inprobabic, occurence if the ucchanism is expericaced, ir a finite, but slightly out of adjustncnt.
A:ALYSIS OF OcCt" ": r:
Each tine an engine is taken out of service, the shutdorn nechanisa oil pressure during engine deccleration.
The oil starts cctuatiny thic to Im reach a -redeternined value to reuct the nechanism during ennine prcasure rmst the ucchanisn before it reaches the trip point.
acceleration to speed to reset Infrer,uently, the nechanisn travels far enough in its cycle during deceleration that reset et restart does not occur before the nachquisa trips.
COPI_ECTIVE:
the enginer nanufacturer, inforned us that the trip Caterpillar Co.,
travel furthcr in its cycle, by having a longer ncchanian could be rmde to This in acconplished by nachining a spacer which governs the start u~
travel.
point.
Further discuccion of the trip ncchanian uith Caterpillar indicates I
lengthening of the travr1 is not necensary if the nechanisn is properly ad-Toleranccs, if uithin specifications, thould not cause a false trip.
justed.
luspections and ndiustments as required, of the shutdoun ncchanism i
l vill be added to the cnr.ine's annual inspection.
1 To insure thnt nl1 four ennines have the trip nechanisu adjusted to satisfactory specificaticus, art:ngencuts have been nade to have a Cat crpillar l
service ran inspect an,i adjunt these ncchauinns, to the reconnended settings.
The engines vill then he tested, uith the service nan present.
P:rp,e 3 s
t e
OCCU!dir':CES :_
FAlLUPP. _1Q\\/Sl!!II A!! Itt'JORTr')
llona PROF;PjJP'ATIC 3:! PACT:
None CODP I:! PACT:
1:onc t
a V }-) j.-)fl.M
-Franh it. Itatitic Superintenlent - !!aintenance f f
)
G..
i g,j'j n ex-
[
%\\ wsy,$
Approved:
Luart Ifrederic E.
Sitperintendent - Ihiclear l'roducticn A*
l I
l
?
\\
I s
1 i
-... -..,., -. - _. - _. - -.