ML20198F133
| ML20198F133 | |
| Person / Time | |
|---|---|
| Site: | Washington Public Power Supply System |
| Issue date: | 11/11/1974 |
| From: | Harold Denton US ATOMIC ENERGY COMMISSION (AEC) |
| To: | Moore V US ATOMIC ENERGY COMMISSION (AEC) |
| References | |
| CON-WNP-1219 NUDOCS 8605280421 | |
| Download: ML20198F133 (4) | |
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'x DOCIET MUMBEES: ~ 50-440 ed 50-513 RESPONSIBLE BRANCE: LWR 2-3.
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REQUESTED C(MFLETION DATEt October 31,197(
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AFFLICAlrIS RESPONSE DATE MECESSAIT 70R i
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NEXT ACTION PLANNID ON FROJECT: ASAP i
DESCRIPTION OF RESPONSE: Amendment to PSAR
.REVIEN STATUS:
Site Analysis Branch (HydroloS c Engineering Section) -
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1; Enclosed are the hydrologic engineering positions on the subject plant a
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l HYDROLOGIC ENGINEERING POSITIONS WPPSS NUCLEAR PROJECTS NOS. 1 AND 4 DOCKET NOS. 50-460 & 50-513 1.
It is our position that you have not demonstrated adequately that the plant areas will not be adversely affected by a Probable Maximum Flood (PMF) on~the local drainage area (38.5 square miles).
Accordingly, provide the following, substantiated, information (Section 2.4.3):
(a)
Provide information that substantiates that only a 6-hour duration Probable h vin =nn Precipitation [ PEP).need le._
considered.
Normally, durations of 24 to 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> are used.
t (b) Provide the parameters used in your runoff model (presumably a unit hydrograph) to estimate the PMF hydrograph, and demonstrate that they are conservative. Additionally, provide the PMF hydrograph.
(c)
Figure 2.4-4 is not in sufficient detail to show drainge patterns through the site areas.
Provide detailed topographic maps of th'ese areas.
(d)
Provide water surface profile estimates for the PMP through
.the site areas, and substantiate that all parameters used in these estimates are conservative.
(e)
Provide estimates of coincident wind wave activity on the maximum; water surface elevation, indicating the maximum wave runup that can be expected.
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It is our position that you have not demonstrated that safety-related structures cannot be adversely affected by a local PMP on your proposed site drainage systems.
(Section 2.4.2.3, see Regulatory Guide 1.70.1.)
Provide estimates of the local PMP, and substantiate that site drainge systems, including roof drainage systems, will not cause ponding on site that could enter safety-related structures.
3.
It is our position that you have not demonstrated that your proposed ultimate heat sink (Section 9.2.5) fully meets the recommendations of Regulatory Guide 1.27.
Provide the bases (and _
demonstrate the conservatism) of your assumptions for water losses from the spray pond for the worst 30-day period of record.
In particular, substantiate that your assumptions on evaporation, drift, wind, wet bulb and dry bulb temperatures, temperature drop due to spraying, and antecedent. pond temperature are conservative.
State whether water, under emergency conditions,'foi~any othAF'purpos~es (potable, sanitary,. fire, etc.) may' be withdrawn from the pond.
If so, these withdrawals must be accounted for in the analysis.
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