ML19220A725

Forwards Hydrologic Engineering First Round Questions Re FSAR

ML19220A725
Person / Time
Site:	Crane
Issue date:	08/05/1974
From:	Harold Denton US ATOMIC ENERGY COMMISSION (AEC)
To:	Moore V Office of Nuclear Reactor Regulation
References
NUDOCS 7904240179
Download: ML19220A725 (3)

Text

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e AUG 5 1974

7. Moorn Assistant Director for Light Water Reactors, Group 2 HID20I4GIC ZNCINEERING Q-1-FSAR PIANT NAME: Thrsa Mile Island - Unit 2 LICZ2CING STACZ: OL DOCIET HIDGER: 50-320 ESFCNSI3LZ BRANCH: IRRr2-2 emu m w COMPLETION DAIE: August 2, 1974 APPLICGIS RESPtXTSE DAIS NECESSART TUR NEIT ACTION PIANNED ON PROJECI:

October 18, 1974 DESC2IPTIDE OF IZIONSE: Answer questions Er7IIW STAIUS: SA3(HES) - Anraiting rasponses Enclosed are 7SAR Q-l's for the subject plant, prepared by T. L.

Johnson and W. S. Bivins, for your tr==rittal to the applicant.

Orgmat Eptd by it. R. Oenton Escold R. Denton, Assistant Director for Sita Safety Directorata of Licensing

Enclosure:

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u V. '! ore, Assistant Direct:r for Light dater Reactors, Group 2 HYDROLCGIC DGI'IEERI:iG Q-1-FSAR PLAliT lL\\._.:

Three Mile Island - Unit 2 LIC :iSI:IG STAGE: OL DOC:GT NUM3ER: 50-320 RESPONSI3LE 3RA:iCH: LWR 2-2 REQUESTD CCMPLETION DATE: August 2, 1974 APPLIC12CS RES?CNSE DATE NECESSA?JI FOR NF.2C ACTION PL1:CIED ON PROJECT:

October 18, 1974 DISC 2i?I:0N OF ZESPONSE: Answer questions BEVIEW STA!t : SA3(HES) - Awaiting responses Enclosed are FSAR Q-l's for the subject plant, prepared by T. '..

Johnson and W. S. Biitas, for your trans:tittal to the applicant.

W Harold R. Denten, Assistnn: Director for Site Safety Directorate of Licensing

Enclosure:

As stated cc: w/o enclosure A. Gianbusso W. Mcdonald J. Pan:arella ec: w/ enclosure S. Hanauer J. Hendrie SS 3 ranch Chiefs A. Kenneke C. Long L. Shao I. :Giel

3. Washburn T. Johnson R. Kleckar D. Eisenhut S..,arga 6c., 9('2 a

AUG 5 ;074 SITE Mi ALYSIS 32X;CH - dYDRCLOGIC ENGC222I'iG FSAR (Q-1) THP.EE MILE ISLX;D - C'IIT 2 REVIEWED BY:

T. L. Johnson & W. S. 31' sins 32.2.

Substantiate the adequacy of site protection for the eff ects (2.4.2.3) of local intense precipitation, including the PMP.

Provide assurances that the site drainage system, including the roofs of safety-related buildings, will prevent flooding of safety-related facilities. Describe and provide details (si:es, di=ensions, composition, grades) of site drainage facilftsus such as culverts, ditches, canals, and drains. Present applicable design bases to sub'stcntiate the adequacy of the designs. Provide a more detailed site map, with detailed topcgraphy, shewing locations of levees, channels, and culverts, any other f eatures involving hydrologic considerations.

32.2.2 Properly reference Hydrometeorological Report No. 40.

(2. 4. 3.1) 32.2.3 Furnish detailed river cross-sections used in determination of water surface profiles and division of flow through the various Susquehanna River channels at the site.

32.2.4 Discuss sedi=entation and esti= ate sedi=ent loads in the vicinit7 of the intake structure. Provide assurances that caterial cannot be deposited during a flood or a flore recession in a sanner which would cause the cooling water intakes to be segregated from the river cooling water.

32.2.5 (a) The riprap and the riprap toe should be designed in (2.4.10) accordance with EM 1110-2-1601, Hydraulic Design of Flood Control Channels, or sinilar conservative criteria, for protection against channel velocities if they are the controlling design basis. Define the controlling design basis and criteria (wind waves or channel velocities) used to establish riprap ci e and thickness. Provide the bases for filter thickness and gradation. Provide the esti=ated scour depths, and basis therefore, anticipated 2.t.the toe of the dike during the design flood and PMF.__ Provide detailed channel cross-sections that were used in riprap design.

(b) Docu=ent that the riprap will withstand the effects of flood waves and channel velocities created by the f ailure of Stoney Creek reservoirs, assu=ing various levels of p

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. flev (up to 1/2 PMri in the Susquehanna ?.iver.

Include wave heights and velocities and describe the nature of the saves.

(c) Discuss any adverse ef fects on the access bridge for flcus up to and including the PMF, due to accumulation of debris, securing of bridge piers and abut =ents, and sedimentation.

Will the bridge provide access to TMI for all Susquehanna River flood levels up to and including the PMF? Discuss the need for access during floods.

(d) Describe placement of the riprap.

Was, or will any riprap be placed undervacer?

(e) Provide tae bases for design of additional riprap protectica that =ay be required in the vicinity of structures which protrude into the channel flcw area or otherwise

=ay produce vortices and/or other undesirable flow patterns.

(f) Furnish results and bases of cc putations of wave action on the levee and saf ety-related facilities for the levee design flood and the PMF.

Provide the bases for your decision not to place riprap on the south dike across the island.

(g) Provide assurances that all safety-related structures have been adequately dasigned to withstand flooding and the static and dynamic effects thereof, such as wave action, runup, and splash during the cccurrence of the PMI.

32.2.7.

Present in datail the hydraulic design bases for the determination

( 2. 4.11) of water surf ace eleva:1ces during 1cwficv conditions.

32.2.6.

Provide assurances that liquid effluents can be discharged through the plant discharge canal, or otherwise safely disposed of, at any river level up to and including the level requiring plant shutdevn. Discuss any flooding effects related to this structure.

32.2.9 Provide assurances that all necessary steps taken to prevent (2.4.14) ficeding of safety-related facilities during various stages of Energency Closure, Shutdown, or Shutdcvn Aler: can be accc:plished in the available time.

I discussion should be referenced to the PMF hydrograph, water surface elevations, rate of rise and time required (including bases for tine required) to accenplish necessary ficod-pravention actions such as gate closures and flood-barniar placements.

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