ML20024C456
| ML20024C456 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 05/07/1979 |
| From: | Bailey H BABCOCK & WILCOX CO. |
| To: | |
| References | |
| TASK-03, TASK-3, TASK-GB GPU-2617, NUDOCS 8307120643 | |
| Download: ML20024C456 (4) | |
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SPJ Phi 7 H. A. Bailey UCENSING t
EVALUATION OF TRANSIENT EEHAVIOR AND SMALL REACTOR' COOLANT SYSTEM EREAXS IN THE L 7 FUEL ASSEM3LY PLANT I
MAY 7,.1979 E/ 0 L U'M E II APPENOICE5 Babcock & Wilcox 8307120643 790507 DR ADOCK 05000 4834
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APPINDIX 1 NATURAL CIRCLU TION y
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Natural Cir:ulatten durin: ?ess of Offsite ?ever Tes: a: "MI-2 P.e::cpelita: Idis:: C:=,.a=y :: du::ed a se::essful less of offsi:e power
- es:== April 21, 197 8, f := an ini:ial power level of 15".
So:h diesel senera:::s were off 1 1:11117 bu star:ed autoca:ically withis 17 seconds af:e
- he reac:c: =ip.
he e=e:ge:cy feedvater sys:e= s:arted a supply of va:er to
- he staa= genera:crs a: a:p ::.i=ately one =inute, hu: the final level was abou:
10" 1: the Operate Range rather than 50*.
Tigure 28 displays the loop 3 core te=pera:ure difference of 357 c more and :he si=..1:aseous change 1: RC pressure and pressurize level during the natural circulation flow condition.
Figure 28 shows c:her RC systa= ta=peratures and indicates nearly equal loop A and loop 3 perfor=ance. The highes het leg ta=pera:ure is = ore :han 1007 below.he sa: uratic: :e:pera:ure for the RC systa=.
Figure ',0, which shows s:aa= genera:or condi:1ons following the reac:or =1p, reveals :ha: the nor=al fill rate for the emergency feedva:e systa= has dras:1cally reduced staa= pressure to 700 psig. A review of previous case power his:ory showed tha: the core had c:1y 0.5 IIP days at the :ime of this test.
Tigu:e 31 co= pares :he loves: ceid les :e=perature vi:h :he s:aa= genera:or sa:uration curve.
S t'telanned Natural'Circula: ion occurrence a: Davis-Besse 1 On Nove=ber 29, 1977, Toledo Idiso: Co=pany experienced as inadver:en:
less of offsi:e power incide:: which unpowered :he four RC pu=ps and resul:ed i: =a: ural circula:1c flow rate cc di:1c:s in the RC systa=. 3 e 1:1:ial reac:c:
power was 40*..
""ne incide:: vas ini:12:ed by unre=oved electri:a1 :es: ju=pers e ith caused the rea:::: pcver to increase us:i1 it '::1pped :: Overpower a: 5 0';.
1 3e reac::: ::1; ini:ia:ed a turbine =1; which caused the opera::: := cpe :he B 4843
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