ML19322D231
| ML19322D231 | |
| Person / Time | |
|---|---|
| Site: | Oconee, Crane  |
| Issue date: | 12/12/1974 |
| From: | Randy Baker BABCOCK & WILCOX CO. |
| To: | |
| References | |
| TASK-TF, TASK-TMR 193, PROB-741212, NUDOCS 8002100074 | |
| Download: ML19322D231 (9) | |
Text
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BABC0CK & WILCOX ITE PRGOLEM REPORT C0!iTR ACT 1;0620-000h SPR N0 193 REY. N0. 01 CUS10'.'ER nee Pmier cenpany vet;COR pocp..ie31 P.O. NO.
TASK N0.28 GROUP NO. h1 SEQ. NO. 01 SITE ENGINEER g.). di a -
REQ'O. RESOL.DAIE REQ'O. C0!.iP. DATE l
-+ *.nm1 1ITLE 2RC - 1 FAILED IN OPL21 POSITIOH DESCRIPTI0tt 0F PROBLEM See 1.ttached:
STATUS - ACTI0tt 10 DATE Il!CLUDING PERSONS CCNTACTED See Attached:
FURTHER ACTION RECOMMENDED BY SITE PERSONNEL See attached:
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RE Si'Luil 0N
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,S$C"ATURE
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l N.S. SUPPORT ENGit:EER
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5 TASA ENGINEER tR PROJECT MANAGER O. 6
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AUTil. CH.\\RGE t'O.
O FIELD CilANGE REO FC NO. / $.5'~~-
i SITE C0"PLEil0N REPORI p c. fo zQi$g O ' RECD.NENDED pc. -4/ (vs3 - 3) pc - fgg(pg. y]L o,, o j, e,]
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_D A T E C0"P L E T E D / (5f7 <-f SIGNEDDV(([}]DAT((/y/g,/7'j[O[,,$".'
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S.O.M. C0t!STR. REP APPROVAL./[$'f [ 9,7 I
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f INSTRUCTIONS FOR PDS-21091 - SITE PROBL1h REPORT
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Initiated by MPG Nuc] car Service l
(1) Originator - Fill in:
Customer; Contract Number; Vendor; Purchase Order Number; Task Eumber; GroupsNumber; Sequence Number;
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Name; Titic; Description of Problem; Status; Further t
Action Recommended by Site Personnel; Originator Signature and Date; Vendor Claim (if applicabic).
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(2) Site Operations Manager - Fill in:
SPR Number; Revision Number; Req'd.
Resol. Date;-Rcq'd. Comp. Date; Approval
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Signature; Date.
l (3) Nuc1 car Service Support Engineer - Fill in:
Cost Category; Authorized Charge Number.
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(4) Task Engineer - Fill in:
Resolution; Recommended Std.'s Changc*; (if applicabic, FC Req. and FC Number); Signature and Date.
- If recommended standard's change, transmit a copy to cognizant Standard l~
Task Engineer to resolve with Standard Plant Manager.
(5) Field Engineer - Implement resolution; upon completion, fill in: Completion l
Report; Date Completed and Signature.
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NOTE:
If necessary to deviate from the approved SPR, note deviation and submit revised SPR to the Site Operations Manage..
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l (6) Site Operations Manager - Approve completion; sign.
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'i Initiated by B!N Construction Company I
(1) Originator - (Same as (1)' above)
(2) Construction Co. Site Representative - (Same as (2) above) iI
.i i (3) Project Manager
_(Same as (3) above)
!l (4) Task. Engineer - (Same as (4) above) l
-(5) Construction Co. Site Representative - (Same as '(5) and (6) above) i
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Dabcock & Yli!cox SPR # 193 Rev.0
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June 12, 197h Oconee - Unit II s
DESCRIPTIO!! OF PROELE:4:
After th 1mc.t reactor trip ^on Unit II on May 30, 1974, it was impossible to keep the nonnal operating pressure in the pressurizer with all heater
' banks on.
It appeared that the yoke bushing threads of the motor-operated valve 2RC-1 are stripped because the shaft does not move in and out of the -
valve, although the motor runs and indicates closed or open position of 2RC-1 in the control room.
STATUS - ACTIO!I TO D/GEII!CLUDU!G PERSO!!S C0!iTACTED:
To naintain the pressure in the pressurizer 2RC-3 was closed after y
the Reactor trip.
With 2RC-3 closed a minimum bypass spray flow of 0.75 gpm is not maintained as per DP 1101-01 section 1.2-5 Stan Holland and Jim Hampton were informed that keeping RC-3 shut violates limits and precautions and that if they continue to operate, f
RC-3 should not be opened unless absolutely necessary to minimize the nunber of cycles on the spray nozzlc. Duke was also asked to revire RC-3 so that it could be throttled to maintain some small continuous spray flow.
Additionally, Mr. V. Miller and Mr. R. Reynolds of Mt. Vernon were contacted in an effort to determine what the effects of frequent cycling of 2RC-3 would be on the pressurizer spray nozzle. Mr. Miller could not provide an absolute nutber as to the allcaable number of cyles, or even what consr.itutes a cycle ;
however, he did state that with the pressurizer et normal operating temperature, spray line temperatures as lcw as 522 F had been analyzed. The results of these analysis indicated that the expected nozzle lifetime was 'not significantly reduced.
Based on this n'dditional inf<n stion, Mr. Stan Holland and Duke Power operating personnel were informed that if they were going to cycle 2RC-3 in order to main-tain pressurizer boren concentration, then they should cycle the valve at a frequency such that spray line temperature did not decrease to below 522 F.
This-information was also provided to Duke Power Company in a letter. ~(Encl. #1)
By June 11, Dune Power Co. had completed electrical modifications to the 2RC-3 i
. orcrator to alhzt thin valve to he stopped at intermediate positions, thus a allowing it 'to be used as a throttle valve to maintain contiriuous spray 'line flev. The valve in now being operated to maintain continuous. spray line..flov.
.The data requested by the letter of Enclosure #1 is here included as Enclosure f2.
This data is highly suspect, since a brief examination of it will reveal gross discrepancics between time-between cycles, and spray line-temperature prior to cycling the. valva. These are unexplained at this time.
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g j t, Wilc0X SPR //193 Rev.0 June 12, 197h Oconee - Unit II With 2RC-3 in a throttling position, the following data was obtained fron
. Unit II:
y Tave =
579 F Tc 558 F
=
Pres =
2155 T (spray line) = 473.5 'F Rx. Power = 75%
By comparison, Unit I pararr.eters are shown below:
Tave =
579 F Te 556 F
=
Pres =
2155 T (sprty; line) = h82.8 Ex. Power = 99 + %
The above data should be compared with the transient data of enclosure #2 to deternine the validity of RC Spray line temperatures as listed. Ilote: Spray line ternoccuples are on the exterior of the pipe and therefore do not measure true fluid temperature.
I'J'THI'R ACTIO I RECO:/?'E:!D 'D BY SITU PER5'0:U;EL It is recorrended that the data of enclosure 2 be forwarded to Mr. R. Reynolds for analysis of the thernal shocks to which the spray nozzle was subjected.
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'It is urther recc= ended that more definitive information concerning the following be generated for all contracts:
1)
What temperature differential constitutes a spray nozzle cycle?
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- 2) How nany cycles are available?
cnd 3)
Given the sam situation repeats itself, what is the best way to operate the systen while continuing plant operat, ions?
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P.O. Box 12CO Lynchburg Va. 24505
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1 l'. O. Box 1175
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,. l Subject; bait II Spray Line Stop' Valve (2RC-3)
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- O Attention: fir. J. Ed Smith'
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Dear Mr. Smith:
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Hecent failure of the spray line' valve (2RC-1) in an intermediate
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.;3 position has required that the spray line isolation valve (2RC-3) be MJa[N i
shut and opened only as necessary to maintain pressuriner boron con-
>.U k-ccatration.
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1 r. Stan Holland and fir. Jim Hampton were informed by E. & W. persennel that operating with 2RC-3 shut violates limits and precautions, Dp 1101-
[*'i 01, in that the mininum required spray flou of 0.75 cpm is not naintained.
B. & U. has further recom": ended that if this method of oneration is con-
- I tinued, 2RC-3 should not be operated unless absolutely necessary to min-
"'-l imize the number of temperature transients on the spray noncle.
An afiditional factor to consider is the severity of the thermal shock suffered by the spray non 1c cach time the valve is cycled. Analycis of
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ter.perature transients has been previously performed with 522 P as the liriting minimum spray flow temperature. Thus, it is further reco:munded that if it is anticipated that continuous cycling of RC-3 vill be re-quired to prevent excessive boren concentration buildun in the nressur-iter, then the valve should be cycled at a frequency such that hpr r line temperature does not decrease to belov 522 F.
While operating the pressurizer in this configuration, it is requested
.'. b that you leg the following data cach time 2RC-3 is cycled:
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- 1) time at which the valve is opened
- 2) tit.u at which the valve is closed 3) temferature in the spray line just prior to openinc the valve.
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. l-'J SOM Letter # 2031
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June 5, 197h o
Oconcc - Unit II n g.'
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Based on conversations with Unit II operating personnel and th. Stan 7lj Holland of' Duke Pcuer Company, this data is now being logged. It in
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cd'litionally recommended that you consider re-viring the controller i.
for 2 liC-3 such that the valve my be partially opened in order to
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tr.aintain a small continuous spr:\\y flov.
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.Yours truly, O..l
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L*. Day
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. Sitc Opere.tions Manager
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U. A. Cobb
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H. L. Pittnan Stan Holland (DPC)
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Loyd Schmid (DPC).
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' dabc'ock & V!ilc0x Enclosure #2 SPR 193 Oconee II June 14, 197h Page 1 of 3 2RC-3 Cycling D tte_
Start Stop Temp._
6/11/7h 0029 0030' h12 0128 0130 0201 0202 427 0258 0259 422 0407 0h08 410 1
0500 0501 h20 0607 0608 408 0700 0701 417 0857 0858 393 0923 h43 0922 1025 1025 425 -
1046 1046 450 12h5 1248 400 11:16 1h19 450 1522 1524 h60 6/11/74 1630 1633 560 9 O
1801 1802 566.6 1901 1903 564.0 2006 2007 562 9 7
2126 2128 565.5 2305 2307 561 7 0100 0103 39h.7 0243 024h 428.2 0317 0318 hh2.8 oh06 Oh07 h24.8 0501 0503 419 5 0624 0625 428.5 0705 0707 431 9 6/9/7h 2203 220h h14.6 2301 2302 h16.h 6/10/7h 0101 0102 39h 020h 0205 h11 0303 030h h12 Oh02 0103 hlh 4
0505 0506 h12 0606 0607 h13 0701 0702 hl'(
0805 0806 h13
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0925 0926 h06
. O 1103 110h 399 i
i 1206.
1207 h2h
'130h 1305 h27 i
1h01 1h02 h21 l
1503 1504 h2h n.
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t gahCOCk EdVilCOX IF.nclonure //2 SPR 193 - Oconee II June 14, 1974 Page 2 of 3 Date_
Start Stop Temp.
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26/w/7h (cont'd)
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1602.
1603 h17 2 1703 1704 h17 1759 1800 415.h 1903 1904 413.0 2015 2016 405.6 2046 20h7 h34.9 2207 2208 418.8 6/10/Th 2301 2302 412.h Date Time Open Time Shut Spray Line Tenperature 6/8/7h 1237 1238 374.8 1333 1334 h21.7 1h33 1h3h h16.2 153h 1535 418.3 1623 1624 425 3 1807 1808 400 9
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1902 1903 h25.2 i
O 2002 2003 415.8 2124 2125 407.7 2202 2203 430.6 6/8/74*
2300 2301 h25.3 6/9/7h 0014 0015 452.8 0118 0119 414.3 0205 0206 425 7 0303' 030h h18.7 okos Oh06 421.3 0528 0529 h07.8 0603 0603 437 9 0702 0703 h23.2 6 /9/74-0822 0823 h08.1 0929 0931 413 1018 1019 h32 9 1109 1110 h24.2 1220
- 1220 h30.1 1329 1329 561.h 1555 1536 412.4 1741'
. 17h2-397 5 1809 1610 438.7 l-i 1902 1903 h20 9
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371 9 1030 1031 564.5 after 11h4' 11h5 560.3
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BabCOCh & Y/ilCOX SPR //193 - u June lh, ? e Page 3 of 3 Cate Time Onen Time Shut Spray Line Temperature 6/h/74-1h30
' 1h31 564.5 '
1529 1530 561.3 1710 1711 566 1915 1916 566."
20h1 2041 56h.7 7
1 21h5 21h5 558.5 2239 2 2140 558.2 1
2348 2349 558.3/
6/5/74 0150.
0153 395 0258 0259 423 0353 0354 h29 6/6/74 0322 0323 h26 6/7/7h 0055 0056 f-0900 0901 566 3 ?
1008 1009 566 )
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