View source for RBG-31324, Forwards Updated Info Re Util Licensing Activities.Effect of Drywell Temp Increase on Suppression Pool Hydrodynamics Can Be Addressed by Evaluating Effects on Peak Drywell Pressure

{{Adams
| number = ML20245H123
| issue date = 08/04/1989
| title = Forwards Updated Info Re Util Licensing Activities.Effect of Drywell Temp Increase on Suppression Pool Hydrodynamics Can Be Addressed by Evaluating Effects on Peak Drywell Pressure
| author name = Booker J
| author affiliation = GULF STATES UTILITIES CO.
| addressee name = 
| addressee affiliation = NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
| docket = 05000458
| license number = 
| contact person = 
| document report number = RBG-31324, NUDOCS 8908160321
| document type = CORRESPONDENCE-LETTERS, INCOMING CORRESPONDENCE, UTILITY TO NRC
| page count = 6
}}

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                             - GULF STATES . UTILITIES " COMPANY                                                                                             ,
RIVEft B4ND M Ah0N    POM OFftCI box 220 -    .5T FRAMP.NILLE Louls;AN A 70775 AREA CODE 6D4 ' ' ti4tiO94      3db 86bt
            ..I' -                                                                   August' 4,1989 RBG- 31324 File No. G9.5,'G9.42                                                 q
                             -U. S. Nuclear Regulatory Commission Document Control Desk-L
_                   Washington, D.C. 20555 Gentlemen:
River Bend Station - Unit 1 Docket No. 50-458 This letter is provided to update the- NRC-Staff River Bend Station (RBS) Project Manager on Gulf States. Utilities Company's (GSU). Licensing . activities in-support of the RBS. The enclosed.
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attachment provides' the currently _ identified non-outage related activities in order of their respective GSU priority. Should                                                                  g activities or priorities change or require special attention, GSU will promptly notify you.                                                                                                        t
: l.                           .In response -to your request - identified 'during the review for L
Amendment 25, GSU has developed the information in Attachment II.
In summary, . the increase in temperature reduces the drywell air mass which in-turn results in lower peak drywel_l pressure and
                             . suppression pool            loads.      Further details are included in the attachment.
I                             Your support of previously completed activities and                                        these upcoming activities is appreciated. If additional information is required, please contact Mr. L. A. England, Director-Nuclear Licensing, at (504) 381-4145.
1                                                                                                                                                            i Sincerely, L''                                          4 f.f.
FJ. E. Booker Manager-River Bend Oversight
,                                                                                    River Bend Nuclear Group JEB/      RJK          ch                                                                                                        I L,
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                                  .Mr. Walt A. Paulson
                                   'RBS-Project Manager
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* ATTACHMENT II The effect of drywell temperature increase on suppression pool hydrodynamics can be addressed by evaluating the effects on peak drywell pressure.
An increase of the initial drywell temperature from 135 degrees Fahrenheit to 145 degrees Fahrenheit with the same containment and drywell initial pressure and dew point temperature selection will result in a lower calculated peak drywell pressure. A higher initial drywell temperature results in less air mass         in the drywell and a lower drywell relative humidity. With less air mass and a lower relative humidity, a larger portion of the steam blowdown will         be used to increase the drywell humidity as opposed to increase the drywell temperature and the corresponding pressure; the net effect is a lower calculated peak drywell pressure.
This behavior is documented in FSAR section 6.2.1.1.3.1.2 which indicates that with a drywell temperature range of 100 degrees Fahrenheit or 135 degrees Fahrenheit, the 100 degrees Fahrenheit case yields the bounding peak pressure differential of 19.2 pst.          The magnitude of such reduction for initial         drywell  temperatures between 100 degrees Fahrenheit and 145 degrees Fahrenheit is about 0.07 psi; therefore, the calculated peak drywell pressure can be considered as independent to the initial drywell pressure.             Since a lower peak drywell pressure leads to a lower maximum pool swell velocity, the generic pool swell impact load definition based on 50 ft/sec maximum velocity remains bounding.
The above evaluation concludes that the generic hydrodynamic load definitions specified in GESSAR and accepted by NUREG 0978 are not affected by the increase in drywell temperature and remain applicable for RBS.
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