ML19317G646
| ML19317G646 | |
| Person / Time | |
|---|---|
| Site: | Rancho Seco |
| Issue date: | 07/21/1972 |
| From: | Deyoung R US ATOMIC ENERGY COMMISSION (AEC) |
| To: | Davis E SACRAMENTO MUNICIPAL UTILITY DISTRICT |
| References | |
| NUDOCS 8003250701 | |
| Download: ML19317G646 (5) | |
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REQUEST FOR ADDITIONAL INFORMATION SACRAMENTO MUNICIPAL UTILITY DISTRICT RANCHO SECO NUCLEAR GENERATING STATION DOCKET NO. 50-312 2.0 SITE
-2.12 Your reply to Request 2.4 states that the AT data for th'e months of November 1971 through May 1972 are now available for pro-cessing. Provide monthly summaries for November 1971 through March 1972 and an average summary for the period April 1971 through March 1972. These summaries are defined in the joint frequency distribution specification in Request 2.4.
Include the number of observations available for these five months of data.
2.13 Provide the rainfall intensities and time distributions used to compute the runof f hydrographs presented as Figures 2A-1 through 2A-4 (Amendment 9).
2.14 Provide typical plan and crosa sections of the on-site dam and its appurtenant structures (spillway, intake, etc.).
2.15 Provide the design bases for site drainsge.
2.16 The Ultimate Heat Sink lafety Guide, No. 27, suggests that a minimum 30-day water supply be immediately available for either normal. or emergency shutdown and cooldown. To substantiate the heat dissipation capability of the spray ponds provide the fol-lowing information:
Provide the t-usient heat load for normal and emergency a.
shutdown and cooldown; b.
Discuss any credit taken for surface cooling and the possi-bility of hydraulic short-circuiting thereof; c.
Provide spray 'coef ficients, evaporation coef ficients, drif t loss estimates and demonstrata that the spray ponds are cap-able of meeting both normal cooldown and emergency shutdown requirements during the most severe meteorological condi-tions which may be anticipated during plant operation.
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The postulated loss of all sources of water except the emergency spray ponds.could require the transfer of water from one pond to another. Your proposal to use a portable pump for this purpose is not censidered as dependable as a permanently installed transfer system.
Indicate your plans and schedule to install pernanent pumps of suitable seismic design, to transfer water from one spray pond to the other, or' modify the design to provide a'n equivalent assurance that water can be transferred from either pond.
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. AUXILIAR5 SYSTEMS 9.17 The ".esponse to Reques t 9.13 regarding the design criteria for sizing the filter bank in the Emergency Ventilatins System for the Control Room is not adequate. The follcwing information is required:
9.17.1 Provide information and/or drawings showing the exact location and elevation of the outside air intake (s) for the Control Room.
Indicate the distances between the points of release (for each design basis accident) and the air intake to the Control Room.
Indicate the expected dilution factors between these release points and the air intake. Provide technical references and/or experimental data to justify the dilution factors used in your
- analysis, 9.17.2 Indicate the type of damper used to isolate the normal Control l
Room Air Intake System (Figure 9.7-2) and the leakage through this line when the damper is closed. Describe the method to be i
used to check the leak rate through this damper.
If significant inleakage occurs, describe a more positive method which can be used to isolate this leakage path. Provide an estimate of the concentrations of noble gases and iodines which could be expected to enter the Control Room via this path for each design basis accident (DBA).
9.17.3 For each DBA, specify the quantity of fission products which could build up on the Emergency Filter System. Provide an estimats at the concentrations of iodines and noble g'ases which
- can enter the Control Room through the filters for each DEA assuming a continuous air intcke of 400 CFM.
Indicate the thyroid and whole body dose of the Control Room operators based on both sources of inleakage for each DBA (assuming they remain in the Control Room for the duration of the accident).
9.17.4 It appears from Figure 9.7-2 that there is a single isolation damper on the outside air intake line. In the event of failure l
of this damper, indicate the doses to the Control Room operators j
for each of the Design Basis Accidents.
l-9.17.5 -In describing the basis for Control Room design, include all l
source terms or points of inleakage into the Control Room, and l
the amounts of activity that can leak into the room from all sources for each DBA.
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-. 9.17.6 Indicate the filter efficiency for,both the HEPA and the
- charcoal filters used in the Eraergency Ventilation system.
Provide the~ basis and justification if the filter ef ficiency used in your analyses exceeds 90 percent. Describe the Charcoal i
Filter System to be.used including charcoal type, weight and bed depth.
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