ML20238C720
| ML20238C720 | |
| Person / Time | |
|---|---|
| Site: | Nine Mile Point  |
| Issue date: | 05/14/1987 |
| From: | Scinto J NRC |
| To: | Neighbors D NRC |
| Shared Package | |
| ML20238A944 | List:
|
| References | |
| FOIA-87-438 NUDOCS 8709100321 | |
| Download: ML20238C720 (45) | |
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Note to Don Nei chbors From Joe Geinto
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Re: Ni ne M2 l e 2 ' Valves 073116 u
Thic is generally okay but.needs some work,
- 1) Gomewhere you should explain what is the change of set points y
l
-involved in this amend.
P.2 suggests that the change is from less than 6% to less than 8% closed but mentions slightly l'
di f f e; rent numbers. f or the " allowable" valves.
Then p.3 says
'n[.lso'rdthing about the new set points " correspond" to'85% MSIV open inhtuad of 907. MSIV open.
All these different ways of talking about the cet point r.hange should be given some context and explained.
- 2) P.S At ;1 east briefly describe the license condition that is being taken out.
- 3) There needs to be at least a brief discussion of the valve designation change indicating that _(I presume) that it doesn't a4fect the vuJves at all -- its only a numbering change --- BUT many numbering changes are the result of the deletion or addition of some val ves.
If this is the case here, it needs to be discussed.
i l'm not sure whether thi s will' involve much change in the SER or whether those are fairly simple.
If they are simple this does not need i o r eturn to OGC.
Call Mr. Karman and discuss whether or not the changes warrant OGC review, e
cc : Nic.ar ni in
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i B/I9 il' B709100321 870829 PDR FOIA PDR-WETTERHB7_ ___ _ __-438
I' NINE MILE POINT UNIT 2 MSIV PROTOTYPE TESTING Packing Dimensions After First Test Sequeace February 10, 1987 Width Depth Ring (radial)
(axial)
'l 0.396 in.
0.256 in.
2 0.392 in.
0.256 in.
3 0.394 in.
0.266 in.
Note: Measurements taken approximately 43 yours after valve dis-assembly.
Based on informal measurements taken earlier, it appears that packing width dimension slowl above value following removal from valve. y increased to i
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Additional Evaluation of MSIV Ball Valve Degradation 7
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The staff, in a Safety Evaluation dated October
,1986, provided its 1
Iassessment.of the conditions leading to degradation of the MSIVs at NMp-2 and of the mode of failure of th tungsten carbibe coating on the I
balls in the MSIV valves. The SE$ also discus, sed the corrective actions h
V.
- taken by the licensee to alleviati the problem as well as the testing and h
- analyses perfonned to define the problem and ' demonstrate the valves were Ii
' acceptable for service for the ffhst refueling cycle. The staff concluded l
'l 's s s
,from the review of the results of the 'te,sts and analyses that were
- [
!perfonned and from the review of the modifications that were made to the i
N l MS!Ys that they were acceptable for plant use uk to the first refueling. By j l their submittal of January 14, 1987 as supplemented and ciarified by letters of January 23 and Jmuary 27, 1987, the ifcensee fonhally advised b
the staff that all of the MSIVs with the exception of valve 6b hadY
/
acceptable leak rates in a Type "C" leak test that was performed following,
/
i
, pre-operat_f onal testing-of the valves in naramh The Ifcensee i
reported that considerable damage was observed on the tungsten flML i
carbide coating on the ball and on the matingfseat surfaces,d= 9 Sb vm m dH:nedhd. The licensee also reported that slight damage was observed on the ball surfaces of valves 6c, 6d and 7d when the bonnets of these valves were removed. The damage to the ball surfaces were reported to be in the same location, attut 12 degrees from the full open.postion,-as was previously observed. The licensee reported they believed that the mode i
of failure of the tungsten carbMe coating was the same as that previously stated. The previously reported failure mode was as follows:
}
I i.
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s 1)l High' local. contact stresses occur when the seats p
- rock" causing the softer stellite. 6 seat material
^
to be smeared onto the harter t ungsten carbide ball surface when the' valve wat,ycled open.
- 2) When the ste111te 6 material'is present both on the ball surface and the seat, the high local s
~~d contact' stresses-cause localized cold welding r
of portions of the seat to the ball surface.
s
- 3) ' Subsequent cycling of the. valve causes local delamination of portions of the tungsten carbide coating when the local cold welded areas are pulled apart.
This premise is N
supported by the observations of the ball and simulated seat surfaces in the e44e friction test performed at about 55 /si ball pressure.
k C /C Pock marks were observed on both the seat and ball after 30 strokes of the valve during the test.
l
- 4) The loose hard tungsten carbide flakes removed frun the q
o-s hM1 surface cut the softer seat surface when the eu.
valve is' cycled, causing the seal between the seat and 4
ball surfaces fo be degraded.
e
/
1 1
The licensee reported they have not identified the root cause for the current problem leading to degradation of the the tungsten carbide coating
~
-but believe several factors may be contributors. These factors are possible build up of allowable tolerances in the valve components, valve assembly problems, and gap to provide clearance for thermal expansion when the Ow J
valve is hot.
e pre operational testing of the valves that has been A
performed to date has been done cold and dryMs M h W h.
. The staff agrees that the factors discussed above could lead to situations where the friction between the ball and the seats could increase, the contact pressures could increase)and the propensity for " rocking" of the CLQ44r*
seats could increase. Further, the staff believes that the stroking of the MSIVs dry during the pre-operational testing is a significantly different operating condition from the 75 cycle test that was perfonned previously.
In the 75 cycle test the ifcensee stated the valve was wetted periodically during the t e staff believes
~tthetestTn~gperfohedtodateis
~
/inadequa )te trovl sis for pred 4nMerformanc'e34h '
utyregh censee has comitted to a proto type valve testing program
=
..... steam condQions.[0nTob[ective of th regram is simulate valve }
fe'rformance during the(frst operating cycle of Jbe facility. The staff J4ng/.and assessment of the results is I l considers the completion of his necessary to reach a conclusibs to - hether additional testing of the actual MSJYs;in't facility above and beyond thbu,r, rent test requirements mayJeIuired to ensure the valves have not excessively' degraded.
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l j6{fpu+ ap The licensee has performed an additional te-t where the ball and seats rY NM
' / 'T from valve 6b were cycled 54 full and pe/rtstrckesabovet}e2 a
f an g
part strokes accumulated from the prefoperational testingf The l'icensee fM Git % g -
selected this partled, Ar ball and sea s for additional testing because it b
i
)
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4 was the most sevenely degrade 0during the preloperational testing. The licensee intended this additional testing to be a demonstration that they
,t had bounded any future degradation that might occur if a valve with a delaminated ball surface and scratched seats were operated for the balance of the first operating cycle. The staff feels the results from this test as well as the results from previous i i kwheretheMSIVshavebeen i[
cycled with the ball and seats damagufindicate that catastrophic failure of
)
the seats would not be expecteC and 6,therefore, any leakage that would 4
occur M-en-MSEwecN4Me+would be around the degraded seats. The staff does not, however, neceb[ fly agree that this 54 stroke test provided a r
quantative bound as to what the maximum leak.'ge could be 1; a valve with a a
damaged ball and seat were operated for the balance of the operating cycle.
The proto ype testing comitted to by the licensee should however) provide J
v c',*ltional insigh;fy tc J,ct thets nrimum leakage rate Met bg p,5 7
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' L ?) L d /(( h* 4*v_.k mummsewwh -se 1A A LS_ g f /W / ^ b'/ b' /I, "'89 yr ~ ~ r IA d w-l Verification of the mechanical Integrity of the valve and the actu-ator for the espected operating and test cycles. Demonstration of valve leak tightness for the espected valve duty cycles. Demonstration of the ability to close the valve within the Technical Specification limits under normal operating pressure, temperature and steam conditions. - Verificat",on of the conservatism of the between-the-seat leak test method as an alternative to across-the-valve seat leakage tests. Provislott of baseline data for the evaluation of (1) the lor-g-ters suitability of the valve and (2) potential design and material taprovements. ',
19 k Q of' da. & M MSZV & N. W l.. 4 MO - W 1. Further evaluation of the effects of valve ball to seat interface and orientation. 2. Further evaluation of friction effects between the ball and seat. 3. Further evaluation of packing design, alternate coatings, alternate spring loads, and seat rocking. m M Wu. O e- 'pst i
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