ML19064A231
| ML19064A231 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 02/20/2019 |
| From: | Rain M Flowserve Corp |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| Download: ML19064A231 (3) | |
Text
9198313376 Flowserve Raleigh Marketing FLOWSERVE rt*/11 20-Feb-2019 US Nuclear Regulatory Commission Document Control Desk 11545 Rockville Pike
~ockville, MD 20852-2746 02:30:47 p.m.
02-22-2019 Flow Control DMslon Am:hor/Darfmg Valves BWRPValves Edward Valves Valtek Control Products Wa1&Bster Valves
Subject:
Spring Deflection Causing Potential Hang-Up of the Flapper (Disc), Worcester Series 44 Swing Check Valve This is to notify the US Nuclear Regulatory Commission that, in accord.ance with the provisions of 10CFR Part 21, we have identified a potential issue and are submitting our evaluation of the
- event.
Attachements:
Picture of Adverse Condition General Assembly Views
==
Description:==
. GE BWXT, acting on behalf of Ontario Power sent five valves back to the Flowserve facility for evaluation of the spring which could spread apart when th!;! flapper rotates open and w~dge between the ~alve body and flapper, creating the potential for the valve flapper to stick open.
Evaluation: Shop inspections of the returned valves confirmed the pote~tial for the spring legs to rotate outwards and* potentially wedge between the flapper and seat retainer. Of the five valves evaluated, two of the valves had the spring legs rotate outward and and after repeated cylces got caught between the flapper and disc; on one of the instances the spring legs prevented full closure of the flapper.
If the valves have a safety-related funtlon to Isolate flow and must transfer closed, then the springs could prevent the valve from performing its safety related function.
The evaluation determined the cause is an inadequate spring design which aliows the spring to deflect and permit the legs to move outaward.
Extent of Condition: In discussion with the customer, it is believed the problem did not exist with valves originally supplled from the Worcester, Scarborough Canada facility; although this cannot be confirmed by Flowserve. It Is believed the extent of condition resides with valves and replacement springs supplied from the Flowserve Raleigh, NC facility when the product line was transferred and. the spring vendors changed; even though it has been confirmed that the Flowserve U S Inc Flow Conlllll Division Raleigh Operations P0Box1961 1900 Soulh Saunders Street Raleigh, NC 27603 Toll Free: 1.aoo.225-11909 Phone:
1-91 !l-a32-0525 Facslmlle: 1-911h'l31-3369 www.flowserve.com 1 /3
9198313376 I*
Flowserve Raleigh Marketing 02:31:11 p.m.
02-22-2019 springs supplied out of the Raleigh, NC facility comply with the product drawing requirements.
The springs were first sold in valve assemblies or as replacement parts from the Raleigh faclUty starting in 2008.
Valve Scope:
The scope of impacted valves ls 1the Worcester series 44 swing check valves. {Please note Worcester also has a series 44 three piece ball valve, which is not in the scope.) The Raleigh
- facility has supplied parts or valves for four Worcester series 44 swing check valves asssemblies which use these springs. The drawings numbers for these valve assemblies are listed below.
Drawing KN44-0590 KN44-0630 14-107362-001 16-118733-001 Corrective Actions:
Valve Size 1.Sx 1x1.5 2
1.Sx 1x*1.s 1.Sx lx 1.5 Customer Bruce Power, GE BW>q & Ontario Power Comanche Peak GEBWXT GEBWXT t!
Owner's may remove the springs. The valves will check-off and seal under low pressure conditions without the assitance of the spring; this was demonstrated In shop tests using tap water pressure (aproximately 60 psig) and will initiate closure when full open without the -assitance of the spring.
Flowserve Is evaluating alternate spring designs along with the possibility of adding.
guides to prevent the undesired spring movement. Any new design will be proof tested.
7'_"'/mk Mark Rain, PE Product/Design Engineering Specialist Flowserve Corporation Flow Control Division 1900 S. Saunders St.
Raleigh, NC 27603 Flowserve U s Inc Flow Canlml Division Page 2 of 3 Raleigh Operalims PO Box 1961 1900 South Saunders street Raleigh, NC 27603 i
Toll Free: 1.SOD-225.e9B9 Phone:
1-91~32-0525 Facsimile: 1-91~1-3369 lWtYlfiowserte mm 2 /3
9198313376 Flowserve Raleigh Marketing Picture of Adverse Condition General Assembly Views I
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L _________________ _J lSQMEJRIC YJEW ~
ar SPRING N<<J :OT HW!INC SIJIIASSQlln.y, Flowserve U s Inc Flow Conlml Olvlslon Page 3 of 3 Raleigh Operations P0Box1961 1900 SDU!h Saunders Slreet Raleigh, NC 27603 02:31 :31 p.m.
02-22-2019 Toll Free: U!00-225-fi989 Phone:
1-919-832.o525 Facsimie: 1-919-831-3369 WWW~MI.Wm 3 /3