ML19326A229
| ML19326A229 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 05/22/1970 |
| From: | Racquel Powell US ATOMIC ENERGY COMMISSION (AEC) |
| To: | Boyd R US ATOMIC ENERGY COMMISSION (AEC) |
| References | |
| NUDOCS 8002030087 | |
| Download: ML19326A229 (4) | |
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Roger S. Boyd, Assistant Directer for Boiling Vater Reactors, 3L
'2fRU: Robert L. Tedesco, Chief, 3WR-2, IllL SITE RELATED MEERS C0]ICERNI3G THE DAVIS Nut A"ILI'1'f Doc 2T No. 50-3M
'Ibe ACSS Subcommittee for the ravis.Besse facility requested that we make available fer its use at the for+he reing meeting (May 26,1970),
a listing of site related problems. In respcase to this request, we plan to provide to the Subcccanittee the following ite:ns alcog with our preliminary ccamente.
(1) Geology-Feundatica
'3nere is the potential that significant solution cavities and colution fissures exist just belev the foundation level of Class I structures. To scaure that any signifiennt cavities and fissures vill be discovered and properly treated, we believe that either of two actions vould be acceptable. First, the applicants could make closer borings (about 15 feet spart) steng vith providinc additicent infcrmation re6arding possible re:nedial treatacnt if found to be necessary. Second, the applicant eculd repcrt the findings of its excavation and drilling alcag with uppropriate treatments, and then ac h ts a site visit by represcatatives of the A?,0 for review. Since the precent plan is to start excavating in July, this approach :may not be practient since it could delay cenpletion of our revisv. ':his matter was discosced with the appli-cents at a meeting held on May 20, 1970. 'Ibey indicated that they would give f.arther study to the development of an acceptable program incir. ding criteria to provide assurance that any significant solution cavities would be discovered and repaired during the exce= tion.
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Reser 8. Boyd MAY 2 21970 (2) Hydrology Flooding aspects of the Davis-Besse site are still under review by us. We need acceptable analysea of the probable maxirJa design veter level and the prcbable minisua low water level, to assure an adequate level of protection of essential plant safety features.
(3) resign Basis Accident We and the applicants do not agree on accident sc4els mainly because of assumptions used in :sodeling
- adteorological effects at the site. 2nsed on available data ve assume that the release of radioactivity froct the containment occurs at the 20-foot elevation and is transported at a vind speed of 1 ::1/see for the first 2h hours. Under these conditions we cal:ulate a two-beur does of 280 res at the exclusion radius and a 330 rem at the icv population zone. At a meeting held on May 20, l'370, the applicants agreed to install an additional charcoal filter in series in the exhaust duct. We ccasider this action to be acceptable.
(4) Seionic
'Ihe horizontal acceleration for the cperating basia carthquake (032) and the design basis earthquake (E2E) are O.C8g sac 0.15g, respectively. Ve and our censultant, U.S. Coest & Geodetic Survey, have concluded the above acceleration values are acceptable for the ravis-Eesse sita.
h applicants have proposed to design Class I structures based on an earthquake response spectru:s which has an ampli-fication factor of 3.0. Class I equigaent vill be designed using a time-history response spectrum which will not vary significantly frca the smooth response spectrum.
Amendment k of the PSAR describes the wthed the applicants intend to use to develop the time-history response spectrum.
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w Roger 3. B yd YAY 2 2 570 Ve and cur seicnic design censultant, John A. 31tane &
Associates, believe that (a) the seismic respcase spectrum proposed to be used in the seismic design of the Invis-Besse Class I structures and equipment shculd have an amplification of no less than 3.5 and (b) the tine-history response spectrum used in seismic design should envelop the smooth response spectrum.
(5) Restricted Areas There are three areas located near the station site which have been established as restricted areas for use by branches of the Armed Forces and industry as impact areas for air to Ground gunnery and bombing training nissions, small arms firing, and anti-airerstt weapcas. These areas are clearly identified in Appendix 2A cf ths PEAR and the type of vespons fired in the restricted area 13 specified. ':he centrol of activities within the restricted areas is enfereed by the Adjutant General, State of Chio, and cuch agencies as ha =ay dalegate this authority. The applicants respenas to question 1.10, Acendaent 3, indien+es that the structures and vital componento, which ars required for safe shutdevn of the facility and preven-tion of any radicactivity release, vill te protected against external missilas by a reinfereed concrete vall with a sininun thickness cf 13 iacher. 'Je and cur censultant, :!r. J. Proctor, IJ. O. :Taval Ordance Inborntcry, have reviewed the penetration capability fcr i
the venpons described in the PSAR.
~he folleving tabis 1:xlicates the reinforced concrete vall perferatica, and scabbing frca projectiles fired frca the restricted areas.
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!apact Limit of Lisit of Projectile Penetration Perforstion Thicknees Scabbing Thickness k0 mm 5.49 inches 3.9 inches 10.35 inches 25 an APIS-T 16.9 inches 21.5 inches 24.1 inches 25 mm APEEI-T k.9 inches 7.h inches 3.S inches 35 mm 27.1 inches 3h.5 inches 33.h inches I
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Roger S. Soyti h-NY2. 7 The above perforation thicknesses inciteate that the 25 m APIS-T (Annor Piercing Discarding Sabot) and the 35 m pmjectile could result in perforation of the nininusa concrete vall thickness of 13 inches. In Appendix 2A of the PSAR the applicants bare indicated that TRW has agreed to construct a bunker and shield system to provide a physical barrier to patect a6minst accidental firing of the 25 uma and 35 : a in the direction of the facility, we will folicw tbs implementatica of this action.
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Raysend R. Powell Boiling Vater Reacter 3rmach 2 Division of Beactor Licensing ec: 2A. !!crris F. Echroeder R. DeLw T. R. Wilson S. Ievins K. Go11er e4 2+ributirn:
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