ML20064K034
| ML20064K034 | |
| Person / Time | |
|---|---|
| Site: | 05200001 |
| Issue date: | 03/18/1994 |
| From: | Fox J GENERAL ELECTRIC CO. |
| To: | Poslusny C NRC |
| References | |
| NUDOCS 9403220179 | |
| Download: ML20064K034 (7) | |
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GENixkurEnergy ABWR Date 3 /\ el9 A To C kok Po s)y s +9 Fax No. - This page plus 5 page(s) From J a ch. F~o x Mait code 175 Curtner Avenue San Jose, CA 95125 Phone (408) 925 l8 7- 4 FAX . (408) 925-1193 or (408) 925-1687 Subject +% u.) s. s nos b o s sMs s ev _ s t - z.3 0 oar 6 dud J ru m si Massage Ck ek > a ka s c ( w kNr s_ k G eo ms Th o wsos s . No4C, h \J s u b st e d ctp_ x .m t -, c e ,_ F S 55t d 1l pey_
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lbP.te. nt M v!.,E fD LE W_ P-This is a revixd response to DSER Open item 2.31. i it was previously stated that the resolution to this issue was to trip the condensate pumps in the event of Level 8 in the SSAR this was further restricted to occur only ifit was coincident with indication that the feedpump discharge valves were not fully closed This solution imposes unreasonable restrictions on plant operat'.- From an operational standpoint, it is desirable to maxmuze the availability of tnc condensate pumt %r: evele cleanup mode to keep condensate in hotwell clean), even bring shutdown periods, when . w water level could be expected to be above 1.crel S. The preferable solution is to close all feedpump discharge and bypass valves in the event of Level 8. This ~ u>lution isolates the condensate pwnps from the vessel, but allows them to remain available and operating for shcrt cycle cleanup mode, it resolves the concern about vessel overpressurization by isolating the condensate pump from the feedwater piping sections in between the feedpump discharge valves and the feedwater injection valves. Therefore, even tf the feedwater mjection valves inadvertantly open, the closed feedwater ptuup discharge and bypass valves prevent condensate llow to the vessel. Condenste Pumps Feedwater Pump.s {[(hjr v.sves O m , n-X Feedwater n P {><C Injection y,3g Valves X n N V Assume iniection valve -) Feedpump . I
- tnadvertantly c; ens.
Hps Valve. Short c)cle X
- Cleanup n 1
Close all of these valves on Level 8. Then, this piping is tmpressurized and no flow. I The attached markups show the changes to SSAR chapter 7.7.1.4 (9)(interlocks) and Figures 7.7-8 and I 7.7 9 to adopt this improvement. We plan to include these changes in Ammendment R l l l 1
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t@ IE ' W I5N I 9 E IllLLD~P E:LM J P. 23A6100 flev. 3 Standard Safety Analysis Report ABWR _ J l 1 flow control valve signal through a linea izing function generator aad then to the feedpump flow control actuamr. In the single-element control mode, which is employed at lower feedwater (low rates, only a condidoned level error is used to detennine the feedpurnp demand.The master level controller (proportional + integran conditions the level error and sends it directly to the feedpump actuator linearizing function genenuar and then to the fcedpnmp flow control actuator itself. When the reactor water inventory must be decreased, during very low steam flow mte. conditions, the CIAV System dump valve is controlled by the FWCS in single
- element control Reactor water is dumped through the CUW System to the condenser.
Each feedpump flow control actuator can be controlled " manually"_ from the main control panel by selecting the manual mode for that feedpump, in manual mode, the operator may increase or decicase the demand that is sent directly to the linea:izing ftmction generator ot' the chosen feedpump flow control actuator (9) Interlocks The level control system also provides interlocks and control functions to q other systems When the teactor water level reaches the Level 8 uip setpoint, j g the FWCS simultaneously annunciates a control toom alarm, sends a trip a 7 signal to the Turbine Control System to trip the turbine genemtor, and sem?
/,' trip signals to the Condensate, Feedwater and Condensate Air Extmetion n
(CF&CAE) System to trip all feed putnps and to close the main feedwater [y discharge valveyThis interlock is enacted to protect the turbine from damace "Ir6m higlisii5iIture content in the steam caused by excessive carryover while preventing water levpl from nsi any higher. This m hr/oc/. MSo ' P'em -
'fuer yresstwirdr% ed g ye% c! }y Isolat g fhe_CandeS lu the even( that the feidwater pump' discharge vafves fail tji close following /
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the Leyef'8 trip signil, the FWyFfmtomaticalbfissues apother signat to th9 g'
!CFkdAE Lysym to trip alMIndensate pwnps in opd6r to avoid [ . [
Dh'e vessel'. ,/ ,/- , / 2_ , (cherpresqufbation p u m ps T rc in T oha veSSet, Upon detection of a loss of feedwater heating, the FWCS will send a signal to the Recirculation Flow Control System which wdl signal the Rod Control and Information System (RCIS) for initiation of automatic selected control t ud run-in (SCRRI). This is done to minimize reacthity transient resulting from introduction of cold feedwater in such an event. 1hte contm: systems not nnouires for santv - Amentsment 33
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.< TRANSACTION-REPORT > . 03-18-1994(FRI) '10:31 E REE C E 1 s'E J t JO . DATE TIME CCSTINATION STATION PG, DURATION MODE RESULT 935 3-16 10:27 408 925 1687 6 O*03'10" NORN.E CK 6 T 03'10'
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