ML20040F663
| ML20040F663 | |
| Person / Time | |
|---|---|
| Site: | 05000000, Limerick |
| Issue date: | 10/15/1970 |
| From: | Case E US ATOMIC ENERGY COMMISSION (AEC) |
| To: | Morris P US ATOMIC ENERGY COMMISSION (AEC) |
| Shared Package | |
| ML20040F238 | List: |
| References | |
| FOIA-81-385 NUDOCS 8202100054 | |
| Download: ML20040F663 (4) | |
Text
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=t!L; iEf- -g.; _N t 9g. 30 gy P. A. Morris, Director Division of Reactor Li ensing Q3 LIMERICK - DOCKET NO. 50-352 - CONTAINMENT DESIGN REVIEW M:' .pt:: The attached questions on the Limerick contahrment design IE.w
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vere transmitted informally in May 1970. They are now being 9.- transmitted formally to complete our records. p{ 7 r,.- W; ; f., - OriginSI *
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r"Eason G. Case, Director M( Division of Reactor Standards ^@'p' rp
Enclosure:
-A Request for Additional Q 9:", Infornation af* .f cc w/ encl: [ S. Hanauer, DR j'{ R. Boyd, DP,L g-D. Knuth, DRL A, e.- G. Lear, DRL fp Isi Distribution: ifi >.,] Suppl.Ning / 7prt SPB Re DR Reading d7 3'I{ 'p DRS Reading bec: H. Specter M. Rosen E. Case Nw. ?N h.. A*, DRS SPB,,,,,,,,,,,DRS:SPB , IR,,,,,,,,, -{t i
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L $b 3' LIMERICK g i V' REQUEST FOR ADDITIONAL INFORMATION i b
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R Provide the initial conditions, feedwater and steam isolation valve
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1. closure time assumptions, blowdown rate, and enthalpy that were used $l @N to analyze the recirculation line break. Nl Y' Describe the bases for determining the height of the downcomers above-2. f! the drywell floor. If it is assumed that the blowdown liquid separates d E fro = the blowdown steam, can the downco=ers be flooded with water from a broken recirculation line? Discuss the relationship of the break hy' area to vent area ratio to the peak drywell pressure and to the peak 5-r s. Are the downcomers designed to J drywell floor differential pressure. IN withstand waterhammer and other possible dyna =ic events that may occur f g during blowdown? 3. Describe and justify your vent clearing model. p b Describe the drywell' floor and downco=er pressure and leakage tests. g 4. How frequently will these tests be made once the plant starts operating? [,'s Assuming that a path exists between the drywell and the euppression g 5. 5 chamber air space before the recirculation line breaks, discuss the 1 } increase in drywell peak pressure as a function of bypass area for Identify and describe all potential bypass paths pure steam flow. 3 that connect the drywell and the suppression cha=ber air space, such p I } as the drywell floor drain system, inoperative supprescion cha=ber
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Analyze the effects of preheating the suppression pool by a small G,, break in a recirculating line prior to the double-ended rupture of .-h gl this line. With the suppression pool at its technical specification 4@: te=perature limit, assume that a small break in the recirculation line N w occurs with the subsequent isolation of the primary containment. For @W: 2 several sized s=all breaks (through 1 ft ) determine the pool te=pera-M b 5 m ture and reactor vessel pressure through at least 10 seconds. Assume l' 'h, that the leaky recirculation line has a double-ended rupture at some 7.it 99 5 -c time within this 10 second time zone. Are ther.e combinations of A.: small break size and time of double-ended recirculation line rupture that would cause the pool te=perature to exceed 170*F during the reac-tor vessel blowdown? Describe the sensitivity of your answers to your w_ assu=ptions of the availability of off-site power, PER cooling modes, nif / g etc. .sy 7. What is the relationship between peak drywell floor differential ha pressure and blowdown rate? How is the blowdown rate affected by pri=ary syste= subcooling? What initial pressure in the recirculation "g m w. line is required to increase the drywell floor peak differential V .D,., pressure by 5 psi above the value submitted in the PSAR? 4E. -c Yl@ 8. Describe and justify your vent flow model utilizing all available g s l prepurge and non-prepurge 11u=boldt Bay and Moss Landing pressure j i suppression tests. De=onstrate that the vent flov model, independent .g. l _.f l of other aspects of the containment pressure transient analysis, is conservative. -t P a i ~ fi ulid. N ~~'~' ~ ~ ~ ' ~~ ~ ~~~~ ~ ~ -}. ~ % iWJissegek, +.4
'5 ' s y. o 9 g hd v 3 h: - P?. ! n ~ 9. Following a LOCA, the fleid in the fan-coil cooling units will heat 11A .. a -[I' 5 up and pressurize. How are these units designed to prevent leaks -b
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VS 10. What te=peratures and pressures would obtain in the dryvell following [ 4? the double-ended severance of a recirculation line if all the drywell 8., ?p: air remains in the drywell and is assumed to be compressed without 'ji, TK n". - mixing by the blowdown steam and water. M, + s.E. 7,$ 7 3r $3 3c s -M 9, $8 1 px ^$. ,f.'
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