ML20024C618

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Forwards Work Completed in May 1979,investigating Methods of Detecting Operation of PORV
ML20024C618
Person / Time
Site: Crane  Constellation icon.png
Issue date: 06/11/1979
From: Roberts R
BABCOCK & WILCOX CO.
To:
BABCOCK & WILCOX CO.
References
TASK-01, TASK-02, TASK-06, TASK-1, TASK-2, TASK-6, TASK-GB GPU-2097, NUDOCS 8307120884
Download: ML20024C618 (23)
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Text

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  • LR:73:6372-14:01 e, n.s.

CETECTIC?! CT PCF.7 CFEPJ. TIC!! ~ wCE S, 1379/ p, COI4Jad*.~*f . cn ^ s..., Attached is a report of the work I cc pleted in l'.my 1979 investigatir.3 mathcds of detecting cperation of the Pfict C;sratad ~ ReliefYalve(PCRV). ~ Y /dfAC e,4;"~~. R. C. Rcbarts RCR:kkd Attachment Sponsored By !;UCLCAR PC',lER GEliERATIC'! DIVISICt!' Cat:4= tion: CC?tPANY Lt'AITE3 t TNs seifoiensi.ca.: f,eets e.e tat.*e i va;mn m, e w www v..n as Co,%'sa. r secto'iant. .. nr.o cuo,o.a.i, a reo;,ee e.,sy.:,,i.. e..e, or is Cwo.,n ecow..:ne. ,f O!STRIBUTIGl: E NPCD R. K. thada J. A. Casta".es j Corp: rate Informatica Car. tar (2). . D. E. Lee a II C 1B I s l E P. E. Perrent

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R. L. Currie K. E. Suhrka T. C. Engelder Library (2) R. fl. Kubik l R. C. Rc!:erts i Library (2) 8". -.e m go -- e

.i o O sc' I Babceck & Jfleer tq;7g:g372 14:01 be,. _t ""r ,g f~'.".' C' 1.0 TNTRCCUCTTCN Following the accident at THI 7 B&W has put a rew c phnis in the 4 operation of the PCRV (Ptiot Cperated P.elief Yalve) used in cur nuclear plants. This report of cy effcets to find 5 sirle and rettable method to detact operatten of the PCRV ccnchdes that several candidates exist r but that It will be necessary to perform tests to confirm that the dete is "Re11able" (work under til anticipated conditions). n

  1. JECT 14: 70_E,sTA8t!!M A FETNCD CF 1.

Primary; detecting "CPCF

  • CLOSED" or "RCW- tio FLCW condition for PORY.

2. Secondary 1 detecting small leaks. failure to reseat. - _CCMDITICNT FCR WTCH C3JECTIVE3 SHCt'tD EE MET 1. Operating with satur.ted steam in the pressurt:er a1; p to 2500 pst.

2. at less than 2500 psi. Operating with subecoled itquid in the prersur Of p rticular interest is the region between 1500 and 2500 pst and a region around 500 pst with saturated staam or watee for both regions PRIMARY UTE CF PCRV i

1. safety limits during a. transient while plant is atTo con power.

2. To Itmit pressures below NDTT limits when AC system is at lower te.paratures.

~ f (See Figure 1. attached, for a picture of RC Fressure. Temp and area ofPCAV). use l l l l r- .m 7

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~ ~.~m o o p _Babceck & W1eer (R:79:6872 14:01 ~) " pe. 3 -Ti .N 'Cr C' OESCRIPTION CF OPERATIC 3 0F PILOT CPERATED RELIEF VALVE (PCRY, ELECTR0" ETIC VAty!) See simplified drawing of valve, Figure 2. NOM'. ALLY CLCSED Solanoid, S, is de-energized. Pilot valve disc, x, is closed with spring force < Pressure in cha:ter, A, goes through the crifice, X, and equaltzes with the pressure in chambers B and C. The force of disc, Y, frtn char.ber 8 ts greater than the force on the tcp of Y closing or main-I taining closed disc of the main valve. k _OPEN t selonald, S. operates e:cvi5g lover, L, operating rod, M, ssal and guida piston, N, actuating rod, O, and pilot disc, x, against the spring and pressure differential. The pressure ~in chae.bers B and C will quickly dug out port O, rapidly because of crifice, X, is much smaller than exit port. D. The reduced pressurein charter, 8, isso great that the pressure above the disc Y fras charher, A, will force main valve disc, Y, open. f A I

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-~ ~.. - ~. e O O 3C Babeeck A kileer LR:79:5372-14tC1 Pace 5 3- .-@..t. '

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C 2.0 STATEMENT OF PROBLEM

i The pilot cperated pressure relief valve (pCRV) used en the RC system pressurizer has had a history of failure both to cperate and to close. At least two valve manufacturers have supplied valves of nearly identical function and both have experienced failures. At least sc=c of the failures have been traced to parts inside the valve that are not accessible to direct detection of metten (see descriptien of valve cperatien and a stepitfied drawing attached for a better understanding of the valve operation).

Therefore, it is necessary to detect operaticn with sc=e indirect eieans to l allow retrofiting to existing installation. i A list of measureables that might be used to detect operation are:

1. Pressure dcwnstream frc:s the valve.
2. Temperature downstream from the valve.

3. F1cw. 4 Noise enitted during valve operation. 5. Ultrasonic (active) eessurecent cf valve disc position. 6. Eddie current measurc= ant of valve disc pcsition. The solution should be capable of determining either cpen-closed or flow-l no flow. A typical physical arrangement of the PCRV is shown in Figure 3. About 20 feet of 4 inch pipe with two 908 ells lead from the valve to a 14 inch header. The header septies into a quinch or drain tank which may have pressure up to 150 psia and is partially filled with water. I I i

o o 1 g; { " \\. ,.s D_-! RC-R2- 'CLECT Q1ATIC" j . w...' e &* RC % nc.yz e i 4 I ( = 3 ,J

s. ac4

\\ / 9 ac-arx a NO RC RIS r b ? \\ 6' kOL i., 6* ktL 14" t Header ) TO ktt.7-3 CRAlft TANK I FICJRE 3 PHYSICAL ARRma7 cp pony e L e

-w O O -ic. Babeeck A kileer t.Rt73:6372.la:01 6.- Pace 7 -- l 'C; C Valves RC-RIA and PC. AIE are safety valves and empty into the sa header.- It should be noted that pressures, ter;eratures (noise) frca these valves operating or leaking will be seen at the PCR , and vthratten To understand the flow in the 4 inch pipe connected to the PCRY.th following should be noted: For pressurtzer pressures above e 1800 pst, two-or 11 quid conettiens in the pressurtzer. phase flow will exis For saturated va;or and pressu es between 450 pst e and 1800 pst in the pressuri:er, two-phase flow will exist during part of the trip to the drain tank. o For saturated vapor and pressure below 450 pst in the pressure, super heated steam shculd exist in the flow. For all Itquids above'212 F in the pressurtzer. two-e 8 Phase flew will result. Estimated pressure, te:;erature, and quaitty of the e drain tank at 15 psia areflow three feet dcwnstrea::: frt:s the PCRV wtt PRES $URI?tR CO?:OTTTC*t '1 T_YAPCR PSIA

a. 2500 PSI saturated Yepor-8 352 431 F 831 b.

2500 PS! Saturated Liquid 398 456'F 43 500 PS! Satur.ted vapoc e. 45 320*F Super Heat d. SCO PSI saturated Liquid ? ? 24% 500 PSI 300'T(sutecoleditquid) e. Drata Tant at 10t1 PSI 17 300'F 05 e Choked flow.111 exist at the exit of the 4 inch pipe into the 14 inch pipe for c:any pressuri:er ccaditions making the drata tank conditica unic:portaat, Pressure drop in the 4 indt pipe 20 feet long with e two 900 els range fras 1 psi to 255 ;;st for the five input conditions caecked. - ~,

t J e O O };- Babecek & uileos LRt79t!B72 14:01 Pace 8 f ',: .g

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C. 3.0 M[THCCS OF DETECTING AND RECUfRED TESTING A. list of identified methods of detecting valve operation is shown in Table 1. None of the methods is without doubts of success and/or problems of implementation. In reviewing this table, one finds Methods 4. '7, 8, 9 and 10 have reasonably high probability of success. These and possibly others not itsted should be investigated in a lab test environ:nent. The following pressurt:er conditions should be ste:ulated:

a. 2500 psi saturated vapor
b. 1500 pst. saturated liquid
c. 1800 psi subcooled 11guld d.

500 pst saturated vapor e. 500 psi saturatiMt 11cutd 8 f. 500 p31 250 F 11 qui 4 leth short (\\ sec) and extended (15 sec) operations should be tried. The outlet piping should be stattar to that used in scoe " Typical' plant. Variables that should be measured versus time are:

1. Temperature near valve outlet i

2. Temperature rear end of 4 inch pipe 3. Pressure near valve outlet 4 Pressure near end of 4 inch pipe

5. Temperature in drain 1tne 6.

Flow if possible O b e 6

. s TABLE 1 , [ METH005 0F DETECTING PORY VALVE OPERATION NETH00 ADVANTAGE 5 DISADVANTAGES COMENTS

3. Back Pressure in 4 inch Pipe pear PORV e Rapid Response e llould not separate PCRV from finworkable i

} (PressureThresholdDetector) e Rolfable Equipment code safety valves s Back Pressure free Drafn Tank can exceed pressure frra valve operation yielding unsatisfactory n> v f results.

3. Temperature fa 4 inch pfpe near PORY

,Re11able Equipment e Dif(fcult or imposilble to Very rarginal (TemperatureThreshold) e Sfsple to implement set threshold temperature operation at e Hay not be possible to tell '3I 1eakage from operation eVeryslowresponse(perhaps 10's of sec) e llould not separate PORV from code safety 3. Temperature in 4 inch pipe near PORV e Re11able Equipment 0 Slow Response Not workable d Temp /d Tlas e Sfspie to Implement a k'ould not separate p0RV from Use rapid rise to set latch to "0 PEN" code safety Q Use rapid decrease to clear latch e Could be confused by change to " CLOSED" la pressure or phase change in pressurtzer s 4. Flow by ap along length of pipe or e Fast Response o Espensive f( Restrictor is May not work at i w nstriction e Reifable Equipment "**d'd 'fI na lf f rence free fg fbcfpes r alve f at lower g e llay be noisy if set sensitive enough for all plant conditions ,g]f fac'h pipe ranged from 1 psi to 255 pst for 5 conditicr.s 4 Me Q

TABLE 1 METH005 0F DETECTING FORY VALVE OPERATION I HETH00 ADVANTAGES Dl5 ADVANTAGE 5_ C0fttENTS 5. Flow by Ultrasonic Clamp On ileter e Very Simple to Install e No Manufacturer has been Unavailable ' Fast found to supply for two-phase fluid 6. Flow by Vortes shedding

  • e fast e liust be in flow stream Unknown e llorks with 11guld or e [mpensive ta install

[ der 9"5 tt e Slople electronics conditions 7. Flow by ident Transfer (FCI)** e sinple Electronics e Must intercept flow streast Untested for i ~ e llorits with all fluids e Slow Response g'foyl e Hay also work for ons leak detection by using second threshold 3. Noise-Accelerometer (to 15 kHZ) e Simple Clampon trans-e May confuse other noise for Untested for ducer " Operation" this appilcation e liay detect leaks e May require adaptation to Not sure wha e Possibly fast response different plant piping part of spec ' e e Complex Electronics is important

  • Bau investigated this sethod of flow detection in some depth about 1974.

J AAC report RR-8091, Dr. H. Windishcann reports that Vortex Shedding flouseters will work with fluids or gases but not both due to the large differences in fluid properties. It is unlikely that a single device could be used for this appitcaticn. I

    • 1his technique looks to be the simplest and best device for the job.

It seems that it would work with all known flow conditions. Mr. Hack McQueen of Fluid Components Inc.', P. O. Box 1165 Canoga Park, CA g1304 (FCI) felt that there would be no problems using this device in a,4 inch pipe with the flow, velocity and quality that we would anticipate. I have sent 8. J. Shepherd a copy of FCI catalog and I have a copy also.

l i TABLE 1 itETl1005 0F DETECTING PORV VALVE CPERATION ptETH00 ADVANTAGES DISADVANTAGES COFM NTS I 9. Noise - Acoustic Emission (10 KHZ to e simple Transducer e Possible Interference from e Untested for 300 KHZ) from flow l e Play detect leaks other noise (less than for e Very fast dB) this appilca-tion e Ilay require machining a e tiot sure wSat flat on the valve to mount part of a Coc9les Electronics %g I

10. Noise - Valve pod Notse e Very fast e Play require machining a flat e sames as #8

@ @ $8 I N e ll0 Interference on valve body e 51spie o Ci* Plex Electronics e Not proven techalque

11. Ultrasonic (NTOType)Detectionof Valve Disc Position e Tells posttion of vale e Requires machining valve body ndependent of e untested in a 11ay not work depending on this applica-valve geccetry tion

' fg"'h.dpeCLOy a Very complex electronics

12. Eddie Current Valve Disc Position e Sare as #1 Except Hay e May Require Extensive e low prot: abo Detector not detect valve stuck euchining on valve sifghtly open ty of success

,,,.a Not Work Depending on ""d AI9h '05LE i Va ve Geometry to implement 13. Noise - 5foging Wfre e Fast Unknown km work was e Sfsple done at Ohio State University on this device - Flow starts a wire stretched across the pipe " singing" - un-able to contact kncwledgeable I persons at OSU , IY'f,'b 1

j I ~# o O Eabeeck & '.'lle r .s tR;79:sg72-ta:01 piee 12 g. r..'

7. Soloneld voltage C'
8. Solonofd current
9. ' Solenofd pesttion (micro-swf tch) 10 Outputs fr:m detector devices.

The results of this testing should lead to a satisfactory detection me Fras the above, it can be seen that the test facility should be ca of supplying s, team at 115,CC0 lbs/hr at 2500 pst for 15 se e equipped for steam valve testing. Figure 4 shows a test system schematic used for valve bicw-dcwn testing that probably would be suitable for o testing also. Further data on valve operation at other than normal c could be obtained also as a piggyback on this testing. :nditions e e

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