ML20024C816
| ML20024C816 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse, Crane  |
| Issue date: | 11/15/1978 |
| From: | Swanson E BABCOCK & WILCOX CO. |
| To: | Spangler W BABCOCK & WILCOX CO. |
| References | |
| TASK-*, TASK-GB GPU-0592, GPU-592, NUDOCS 8307130360 | |
| Download: ML20024C816 (3) | |
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Fron FLED.
E. V. Swanson. Plant Integration ass ess.s Cast.
File No, I-Toledo-TSS-14
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Cate Auxiliary Teodva:er Setpoints Novenhor 15, 1978
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..:..'.. M Our recent discussicos with Toledo personnel regarding their osed'to reduce 1
the stea= generatat level setpoint for natural circulatico, and 3&W's need to maintain a high level because of ICCS s=all break have led to an i= passe.
. f)i Both B&V and Toledo are in a " risk" position because the Toledo s=all break topicial was based on a 32' level position; any change to that position =ay require.re-analysis a.d re-licensing. Nevertheless, a stea= ge:erator level value has not been reported to NRC and the ICCS Unit believes that a 10' level se: point vill bs adequate.
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Toledo's needs to lover the serpoint are genuine and I offer the following
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suggestion which you should pursue with Toledo:
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Alter the ec=:rol logic of the STRCS so that it vill provide evo se:pci===.
'71 Since a ec: trol function cannot be readily p!sced is an ISTai sys:es, the c...-?
STKCS must be =rdified. In the presence of an E. STAS sigsti. the ESTAS J-
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sets a priority 'for operatics over any ST3C3 signal and dire::s the STICS
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to provido a high setpoint level control. In :ha abser.ce of an ISTa3
.- t s:gnal, bu: vith sn-STRCS generated signal, the ST7,CS con:rci se:peint
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(, C is directed to a lev Invel. " A general sche =ati: is attached; c:h:r esthods
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..t of implacenti=; a:e possible. but this purveys the concept.
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ESTAS could also initiate auniliary feedva:er and isolate = sin feedvater.
Turther inves:igation needs :o be e.ade as to the actual see:uence of even:s.
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'. ' 'Y i I believe 1: is new pcssible fc two condiriens to exis: because the II o
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systems do not initia:e A7".* by ESTAS.. These ares
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Siee co.dition Svstens Secue ee C.e.-trol !c ta:1.:
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Cffsite Pcver Avsilable ISTAS.--k* ICS 2' W u.
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Offsite Power Unsvallable ISTAS -cm STKCS.
10' (Auz. Teedwater)
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J'M If my ressening is' correct. the first condi:fon vill only previde a 2' t
contrn1 (of r. sin feedwater); r.o ST7CS sign =1 vill occur sad ths ICS will
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control. The other condition vill e uae the STTCS to respond to a loss of Icvel (nos: likely) or to,s lost cf punp. powcr. A: any rate. STRCS will Y
Initiate A1*J nd control to the hig!r sctpoi=t.
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. $sa$sentoSpangler Nove=ber 15. 1973 Auxiliary Teedvater Setpoints Co The first conditica =sy or c.sy not be acceptable to ICCS Analysis; they If such an
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have not 1 vestigated s s11 breaks with KC pumps running.
analysis were to be =.ade, the results veuld probably be unfavorable.
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I suggest that TEco confirm that the abeve sequences are correct before a decision is r.ade to initiate ATU with ESTAS.
I believe that further analytical effort vill probably be needed by Eccs.
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the 10' setpoint,is acceptable even though their judge =est to confirm thatI think that some docu=entation on file vill be required to n
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substantiate their claim, but I do not recc==end analyses at this ti=e.
4 An add).tional thouster.ight be considered for 11=1:1:3 the pressurizar W-4.
Recent i=vestigations for the 205 plants have shove us that.
draining.
the race of additios of feeduater has a substantial effect on RC temperature The Toledo plant power level caly requires about 500 sps (at about
.T Yet the pu=ps are capable drop.
30-40 seconds af ter trip) to remove decay heat.
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(at design) of about SC3 g;m each; with reduced staar. generator pressure to 30%. The total flev rate
'?j the addition sata increases by about 25:
possible tends to introduce subcooled water into the generator, fill to 4.
a preset level (pessibly as a subcooled inventory-I. don't kncv the effect of heat pickup as the water falls th:cugh the tube nese), and the= heat up
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A r. ore preferable mode would be to introduce flov at a rate +
to boiling.
more equal to the decay heat load.. An i=vestigation i=to race li=iting 6
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O li=iting may be a full or. partial tradeoff for level
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7,/'f Further discussions with T!co about these suggestions are desirablej ve
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