ML20125D880
| ML20125D880 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 12/22/1978 |
| From: | Tally C BABCOCK & WILCOX CO. |
| To: | Robert Davis BABCOCK & WILCOX CO. |
| References | |
| TASK-TF, TASK-TMR NUDOCS 8001160807 | |
| Download: ML20125D880 (1) | |
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THE BABCOCK & WILCOX COMPANY POSER GENERATION ".ROUP Q-, Q; h,.
To l
R.B. Davis, Manager, Control Analysis rcm C.W. Tally, Control Analysis
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.os m.3 Cust.
File No.
TECo or Ref.T3.59/NSS-14 S V DJ.
Date Pressurizer Level Problems Following Reactor Trio December 22, 1978 I
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3 On December 20, 1978, a brief study was performed on the Old Forest Road Simulator to determine the sensitivity of the reactor trip transient to the 9
auxiliary feedwater flewrate.
The results are basically cualitative because the output available for recording is in units used in the computer program and has not been user oriented.
For examole, orassuri:er mass is available, but no level.
Parameter scaling aise makes cuantitative results dif'icult ::
obtain.
However, i: was clear from the runs we made :nat the transien: :ressu-i:er invent ry is strongly cecencant on :ne AFW feedra e.
Although we could.c: a:nieve the AFW feedrate of 1200 g:m cer loco wnich D5-1 suroesedly nas, we Oi: rea:n about 1100 gom.
Runs made with :nis ficarate are ::::ared wi:n einars wi:n hal f this rate.
The effect was marked:
RCS cressure and cenerator :-:::sc roce slowly W the minimun level rectnec was ni;her.
~he runs'also sho.:::.n a:
e pressuri:ar is not very far free empty after a normal..rsact:r trio fr:m 1:I.
FP, rea:ning levels in :ne neigt.cornecc of -.;5 :: -53 incres.
Tnese res'_l:s,
- l th u ;r :l i;P i.
..c., 4.ieu re, ba s i cal ly cr.m.~ h.. F..' '. '..l nk s ' ? re d h.. m maintaining some inventory in tne cressuri:er cay as marginal for situs:icns in which AFW is permit:ed :o rapidly raise OT5G levei :o 123 in:nes.
I do not offer these results as evidence to stand alone.
For one thing, the simulator is a training tool and not intenced fo-analytical our:oses.
' o.m e r,
jit can be ouite instructii.e in si vations like :nis anc I teliev : W :s :..
'the feasibility of using PT-P! (177 FA version) :s co an AFh si:ing araiy: s ::
suppor a design cnange to the OB-I system.
It a;oears tha: :nis may be :ne salient ooint in the clant's capability to maintain an acceptable pressuri:er level and as such, should be addressed in any discussions for a permanent fix l
if plans for a dual level setpoint fix fall through.
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CWT /Ip cc: h 8001160dD7
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