ML20198G448
| ML20198G448 | |
| Person / Time | |
|---|---|
| Site: | Satsop |
| Issue date: | 05/14/1975 |
| From: | Oreilly P Office of Nuclear Reactor Regulation |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| CON-WNP-1309 NUDOCS 8605290596 | |
| Download: ML20198G448 (20) | |
Text
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9 UNITED STATES NUCLEAR REGULATORY COMMISSION W ASHINGTON, D. C. 20555 MAR.1 41975 DOCKET NOS: STN 50-508 AND Y 509 APPLICANr: NASIIDUKN PUBLIC IOER SUPPLY SYSITM (WPPSS)
FICILITY: WPPSS NUCLEAR PIGECTS 10. 3 AND NO. 5 SLM4ARY CF FEBIUARY 25, 1975 MEETDC WITH WPPSS RHNDDG ULTIMATE lEAT SINK On February 25, 1975, representatives of WPPSS, Phacrn, arri Ocrtustion Engineerig met with the NRC staff in Bethacada, Maryland. The meeting was held at WPPSS' request in order to discuss their proposed revision to the design of the Ultimate Heat Sink for WPPSS lbclear Projects !b.
3 and No. 5. Enclosure Ib.1 contains a list of attendees.
Ebasco described the present Ultimate Heat Sink design. 'Ihe present design consists of a ombination of wet and dry coolig towers located on the roof of the Any414ary rutilding for each unit. 'Ite proposed design revision would use only dry coolig towers, which would be located on the Auxiliary niilding roof (see Enclosure No. 2).
Itasm then described how the meteorological design bases for the present Ultimate Heat Sink were obtained. The 20-year set of meteorological data obtainoi at Olynpla was ur,ed to obtain the meteorological design bases. The method used to extrapolate the set of 20 years of data to a 100-year recurrence interval was described by Pha m . This method is described in Enclosure No. 3. Usig this nethod, a nuximum tsperature of 108 F was obtained. !b attspt was nado to correlate the Olympia data with the data obtaired onsite or with li:nited data available frun Elma. Ebasco daaeribed a prnhabilistic technique that was ussi to support a maxi == taperattre of 93.5 F which they proposed to use for the revised Ultimate Holt Sink design.
Details of this prnhnhilintic argunent are also described in Encicoure No. 3.
In response to our irquiry, mam stated that, if the atmospheric tsperature excoedel the design basis maxinun tsperature for the dry cooling towers for a sufficient period of time (about 4-6 haurs),
the capability of the Ultimate Heat Sink to function in the event of an accident might be inpaired.
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'Ihe reatmnerdations of Regulatory Guide 1.27 regarding the meteorological design bases for the Ultimate Heat Sink were then discussed.
We inforned WPPSS that the following approaches mac+Irdng the meteoro-logical design bases for the Ultimate Heat Sink would be considered acceptable:
(1) Use an appropriate historically recorded =v4== tanperature. frm the region near the site (105 F recorded at Elma) as the traximum tarnperature and provide a statement that Olynpla recorded 103 F as the highest tanperature.
(2) Correlate the temperatures recorded at the site with those recorded at olyupia, considering wve.iate cmfidence intervals, to daronstrate that the 103 F =v4== tmperature rh at Olynpia is more representative of site corditions than the 105 F recordai at Elma. Use the 103 F taperature in the Ultdrnate Heat Sink design.
(3) Use the :xchabilistic approach described, including appropriate confid;%:o L.tervals. The worst possible conditions and all reasonaLie ocanbinations thereof should be used (loss of offsite power, earthquakes, micsiles, taperatures, high winds) along with the upper conf 1derce limits.
(4) Use a lower =vi== taperature (such as 93.5 F) and show that the consequences of =eMing this temperature are acceptable.
L 4 f Patrick D. O'Reilly Light Water Reactors Project Branch 1-3 Division of Reactor Licenalty
Enclosures:
- 1. Attendance List
- 2. Essential Cooling Water Systen -
Previous and Revised Designs
- 3. Nav4==t 'hnparature Analyses cc w/ercl: see page 3
r-
+
) MAR. I 41975
. 3 --
oc w/ enc 1:
Washington Public Power Supply Systan NETH: Mr. J. J. Stein Maranging Director 3000 George mshington Way +
Richland, Washington 99352 JW B. Rnot.ts, Jr. , Esq.
Cwar, Hadlock & )(notts 1747 Pennsylvautia Avenue, N. W.
Maahington, D. C. 20006 !
Ridurd Q. Quigley, Esq.
Washington Public Pawar Supply System 3000 George mahirgton Way Richland, Washington 99352 +
4.
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1 Drm'RE ND.1 W LLTf
_h I 3W S C OIW RJBLIC PODER SUPPLY SY9ITM D. B. Mitford G. Sorensen 03ENJSTIN ECINEERDG, DC.
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TABLE II
- PROBABILITIES OF DAILY MAXIMA Temp. Probability. + Return Period .
(years)
, h .
(decimal) .
92 0.004215 0.65 93 0.003058 0.90 93.5 0.00274 , 1.00*
94 0.002238 1.22 95 0.001632 1.68 96 0.001192 2.30 97 0.0008693 3.15 98 0.0006387 4.29 98.5 0.0005479 5.00*
99 0.0004710 5.82 100 0.0003424 8.00 101 0.0002523 10.86 102 0.0001812 15.12 103 0.0001365 20.07 104 0.0000976 28.07 25 0.0000727 37.69 8
06 0.0000531 - - 51.60 . .
1;07 0.0000387 70.80 liO8 0.0000274 100.00*
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