ML20236X238
| ML20236X238 | |
| Person / Time | |
|---|---|
| Site: | Trojan File:Portland General Electric icon.png |
| Issue date: | 06/04/1987 |
| From: | Mayer L, Van Bladeren G PORTLAND GENERAL ELECTRIC CO. |
| To: | |
| Shared Package | |
| ML20236X228 | List: |
| References | |
| TAC-65473, NUDOCS 8712090066 | |
| Download: ML20236X238 (17) | |
Text
- _ _ _ _ _ - _ - -
ENCLOSURE 2 IULTAEK REPORT 135UE:
Accumul_eter Fill Line Failure
.-_. b.d-Action Plan I tem bio. :
TITLE:
Kerotest Val ve Flew Test e u n_ r.r.
Druermine flew r ate at which Karatest Ve fe ecomec unstable 2nu
" :.cu. : e c r jurinc reserse flo.,9.
Dupi cate the Troian EIE accumulator fill line geometry f rom accumulator "A"
to valve CVE570A s.s cicsaly as practical but using availicl e materi a;s.
Use a watzr c
.r ". 9 at OOarOman Plant wniCn h a E. sufficient hwad and ficN fcr tne e n a. r..
.. t. ;.,
3..
g.; ;L - - gg g; 3 / L U..L w, j I UlN'.) :
The bc:.ler Desl acgir.; Water Evutem nas two cumps. cach rated at 400 gem and 60 psi.,
We chose this system fcr the te:t.
Scardman Plant personnel cl os el v replicated the cecmetry of the Trojen ciping s" stem from EIE Accumulator
'A"
- valve CVE975A.
C ar c or' s t e e '..
w
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_--a..
.~_.w.,
'e established steacy state flow conditions at 10, 13, 37, 40 and 63 acm without valve chatter.
We increased flow until chatter started I
an t n, e n recucac taow s:1gnt.v.
gJe mee.sur ed a steadv stage tiow ot
.3
- E ;pr aithout chatter.
When we increased flow acain, chatter bwgen a.n c :ne pipir.; c r oit e. Etc; pinc tha test. before a measurement c uld ce taken.
.:. p w.ct:cr curi"c /aive chatter was vicient, a fecting the da lagging system piping about 75 fest away.
This pipinc. hcwever.
.- mrv f l.3::i bi s.
The rolse.oes loud.
The frequencv did appear ic C a.a e r.d er flow rate as it did sound Icwer at tne tnresholc than at higher flows.
The tabs on the lateral restraint at H-226 location L t.j _cce m - d :..a were signti : ant y bent cutwerc.
ine ancnce at 3.acaplon 3
- et move.
~t is clear t o
,.is that thc valve : hatters violent 1v at hich reverte
- 1 2 ". ca es ishcut ccn enc that ~ha resultina water hammer :an
~
_...,i...
.., 4.. i r. o,
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,.3 r.+...... - -
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4 s.
taa accumu1=ter cannecticn.
1 estimate t.at the rumcer cf.vcles to a
i.p...
- v. 4.
4..
- q,.
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y.
. 7...
cru c l e ar ". s record 2d cr. v: deo:s :e rttu.
.,.. s L n ci. _..;.ni c :
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1.
Test Proteaure 2.
e lowmeter Check : heet 3.
Test Data Sheet 4.
As-built Icometric of Test Piping 5.
Tro;ar 5t cr er c.c - Miter:a1 Isave sheet
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8712090066 871203 PDR ADOCK 05000344 P
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KEROTEST VALVE FLOW TEST l
[
l (SIS Accumulator Tank Connections) 1 Y
_ M___________________________________
APFROVED BY G o<, b Van B1aderen 1.
References 11 Tr o j an Isometric Drawing blumber CI-60!R-1 -690, Rev. 6 1.2 Kerotest Valve Drawing Number W-D-9913-(2). Rev. D 1.3 Boardman PLID 1-M-116. Sh 2.
Rev.
l.4 Maintenance Request ____________________________
2.
Scoce Investigate flow conditions which are believed to have
!alve in the caused unstable operation of the Kerotest
/
Trojan Enfety Iniection Accumulator Fill Line.
Using a piping system in the Ecardman Flant with suitable head and flow, install a piping arrangement similar to that between accumulator and valve, a Kerotest val ve.
and verify i1ow conditions for anset of valve disk chatter.
~ ~.
Design 3.1 Use the Scotblower Deslagging Water Fumpc as the water source.
The test engineer has the authority to use a different ccurce if f i el d conditions don't al l ow usina these pumps.
3.2 Between the plant piping system and the 1-inch line to the Eerotest valve. install a short section of larger diameter piping to si mul at e a vessel.
The size of piping will be determined based on avai l abi li tv of
- n at er i al.
If suitable materi al is not avai l abl e. the test engineer may direct attaching the 1-inch 1 :. n e directiv to the olant system.
~. ' "
Ancher the simulated vessel saturely to wichstInd expected pipe whic.
If the ccnnection is di'ect ;c the plant piping system, anchor the 1-inch line s ec ur el v to prevent any damage to the plant piping.
3.4 Duplicate the arrangement shown for the 1-inch 1ine as shown on Reference 1 as closelv as practical.
Use schedule 40 carbon steel pipe.
Anchor the pipe coming out of the I:eratest valve at the 1ccation which CV527EA sculd normallv occuev.
Inatc11 a 1ateral restraint at 1ccation H226. Dc not inst all H224
- f
,s
- * - ~,.
required by field condi.tions, this design may be modified by the test engineer.
3.5 Direc.t or divert the flow from the pipe outlet to a safe location.
4.
Test Equipment i
4.1 Flow meter installed in deslac.aina. water pipinc..
4.2 Tepe recorder.
4.3 Video recorder. if av ai l ab l e.
- 4. 4 Communicate 6ns betwsen cumo centrol staticn v s.1 ve operator, and observers.
4.5 Stopwatches.
5.
Test Procedure 5.1 Fully Open Kerotest valve.
I.2 21 :22 crair..ent alpin; succivir.c water tc tszt es t a' l i st-2: ping. Etart onc deslagging water cump and c
recircul ation flow.
Use drain / vent valve in supply line to control test f1cw rate.
Establish a flow rate ef abcut 15 gem.
Increase flow rate' slowly until velve chatter begins.
Step at increnents to record flow rate and make observaticne of flow / equipment interaction.
5.a Start tace recorder to record soun=s of valve at beginning of test and record complete test.
If video recorder is avail abl e, record entire test.
3.5 Start:second deslagging water pumo if more flow is needed.
5.6 Determine flow rate at onset of valve chatter. Trio pump if piping becins to whip.
Tric cumo at first indication of potential dancer to personnel er ecuicment.
o_
Ece_2en.atacc w.'
Ett2r data n at: ached data sheet.
6.2 Prepare repcrt
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i KEROTEST VALVE FLOW TEST DATA SHEET (SIS Accumulator Tank Connections)
F1ow. aal2 Time Interval F1ow Rate Observations 1
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______________________ Engineer Mayer - Tect Loren E.
Date:
Witnessed by:
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Mayer - Test Engineer Witnessed by:
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N0 PGE 2345 (Oct 86), PLEASE PRINT __
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FROM 303 22( 5690
'87.06.15 06:56 ENCLOSURE 3 e
CHRONOLOGY OF ACCUMULATOR FILL LINE FAILURE On Hay 12, 1987 While transferring water from the "A" accunuletor to the "D" accumulator by sluicing through the fill lines, a rupture of the "A" fill line at the accumulator nozzle-to-pipe weld occurred. The differential pressure between the accumulators at the time was 583 psid.
On May 13, Nuclear Plant Engineering commenced an investi5ation/
evaluation of the failure.
On May 16. the weld was repaired and the clearance on the system was released on May 18.
On May 22, a metallurgical evaluation, which had begun following 'the rupturo on May 12, was completed, revealing a low-cycle f atigue f ailure had occurred. preliminary conclusions reached were a fatigue crack could have initiated during construction of a platform near the "A" fill line.
The workors may have used the pipe as a platform from which to work during construction. The effect of the sluicing operation would have been to propagate the crack. This hypothesis was being evaluated by Nuclear Plant Engineering.
l The system was hydrostetically tested satisfactorily on May 23.
Later in the af ternoon on May 23 af ter the pressure in the accumulator was reduced l
to approximately 650 psis, operations tried to repeat the sluicing opers-tion.
A loud banging noise was heard, and the operation was stopped. A second attempt was made and the loud banging noise continued.
Followin5 a valve line-up check, the operation was started again, and the fill line nozzle weld for the "A" accumulator failed again.
A metallurgical evaluation has been completed on the second failure with the determination the failure is again low-cycle fatigue, Evaluations have been conducted to determine the cause of the failure and the source of the loud banging noise.
It has been determined the noise came from the packless, diephragm valve in the "A" fill line When exposed to backflow with a very high differential pressure. This conclusion has been verified through vendor and industry contacts. A backflow test across a packless, diaphragm valve has been performed and has verified the valve chatter under backflow conditions.
Inspections of system pipin5, supports, valves, and welds have been conducted on a selected basis for each of the four accumulators.
An independent evaluation of the sluicing operation and poet aluicing operations has also boon performed.
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