ML19064A231

Flowserve - Spring Deflection Causing Potential Hang-Up of the Flapper (Disc), Worcester Series 44 Swing Check Valve

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 02:30:47 p.m. 02-22-2019 1 /3 FLOWSERVE

' Flow Control DMslon Am:hor/Darfmg Valves BWRPValves Edward Valves

' rt*/11 Valtek Control Products Wa1&Bster Valves 20-Feb-2019 US Nuclear Regulatory Commission Document Control Desk 11545 Rockville Pike

~ockville, MD 20852-2746

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 US Inc Raleigh Operations Toll Free: 1.aoo.225-11909 Flow Conlllll Division P0Box1961 Phone: 1-91 !l-a32-0525 1900 Soulh Saunders Street Facslmlle: 1-911h'l31-3369 Raleigh, NC 27603 www.flowserve.com

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9198313376 Flowserve Raleigh Marketing 02:31:11 p.m. 02-22-2019 2 /3 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 ls1the 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 Valve Size Customer KN44-0590 1.Sx 1x1.5 Bruce Power, GE BW>q & Ontario Power KN44-0630 2 Comanche Peak 14-107362-001 1.Sx 1x*1.s GEBWXT 16-118733-001 1.Sx lx 1.5 GEBWXT Corrective Actions:

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 i

1900 S. Saunders St.

Raleigh, NC 27603 Flowserve U s Inc Raleigh Operalims Toll Free: 1.SOD-225.e9B9 Flow Canlml Division PO Box 1961 Phone: 1-91~32-0525 1900 South Saunders street Facsimile: 1-91~1-3369 Raleigh, NC 27603 lWtYlfiowserte mm Page 2 of 3

9198313376 Flowserve Raleigh Marketing 02 :31 :31 p.m. 02-22-2019 3 /3 Picture of Adverse Condition General Assembly Views I

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ar SPRING N<<J :OT HW!INC SIJIIASSQlln.y, Flowserve U s Inc Raleigh Operations Toll Free: U!00-225-fi989 Flow Conlml Olvlslon P0Box1961 Phone: 1-919-832.o525 1900 SDU!h Saunders Slreet Facsimie: 1-919-831-3369 Raleigh, NC 27603 WWW~MI.Wm Page 3 of 3