ML20212E316

Safety Evaluation Re Operation of Rockwood Stone,Inc Quarry Near Plant

ML20212E316
Person / Time
Site:	Fermi
Issue date:	02/27/1987
From:	Office of Nuclear Reactor Regulation
To:
Shared Package
ML20212E278	List: ML20212E274 ML20212E316
References
NUDOCS 8703040323
Download: ML20212E316 (4)

Text

s.x.y g ; _ 1 c'<_ , :A . . . . "a a u.s : _ . c.J

^

,m n.  ! -- - .

sI

~ nee

'('

~

UNITED STATES I o NUCLEAR REGULATORY COMMISSION j I wAsumaron, o.c. asses  ;;

- SAFETY EVAt.UATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION RELATED TO THE OPERATION OF THE ROCKWOOD STONE INC OUARRY DETROIT EDISON COMPANY (DECO) 1 FERMI-2 DOCKET NO. 50-3411

1.0 INTRODUCTION

In a telephone conversation on June 24, 1986, the staff conveyed to DECO a concern regardino the potential effects of operations at the Rockwood Stone, Incorporated, (RSI) quarry on the safe operation of the Fermi-2 plant. This

_q uarry has operated since 1982, producing dolomitic limestone for the con-struction industry. Previously described existing quarries with respect to the Fermi-? site are at least eight miles away from the site. In a [[letter::IA-86-512, Responds to FOIA Request.App Documents,Including NUREG-0020, NUREG-0030,NUREG-0090 & 691121 Rept to ACRS, Enrico Fermi Atomic Power Plant, Available in PDR|letter dated July 24, 1986]], the licensee provided an analysis of the potential effects of the RSI quarry operations on the Fermi-2 plant. This Safety Evaluation describes the staff's review of the July 24, 1986, submittal and its findings with respect to the safe operation of Fermi-2.

2.0 EVALUATION The operation of the RSI quarry involves the use of explosives for the purpose of blasting quarry stone. The explosive used is Ammonium Hitrate Fuel 011 (ANF01, which has a TNT Eouivalence of 1.08. .The, explosives are shipped to the quarry by truck in approximately 40,000 pound quantities, with a maximum onsite storage of about 80,000 pounds.

One hazard associated with the operation of the RSI quarry is an air blast

due to a potential explosion of bulk quantities of ANFO. Deco has estimated the blast overpressure considering an explosion of 80,000 pounds '

of'ANFO. Specifically, using the guidelines of Regulatory Guide 1.91, DECO estimated that the blast overpressure effects are insignificant with respect l to safety-related plant structures beyond a distance of 1989 feet from the explosion. The staff has performed an independent analysis of the potential i

blast effects of such an explosion. The results indicate that the potential air blast effects of either an explosion at the quarry or an explosion of a shipment at its nearest point to the Fermi-2 plant are insignificant with respect to the plant structures.

The explosions postulated also have been reviewed with respect to potential ground effects at the Fermi-2 site. DECO considered the ground effects due

, to nonnal blasting operations at the RSI quarry and in its engineering judgement has concluded that the ground effects at the Fermi-2 site due to

normal blasting would be insignificant. Deco also noted that there has D

' , , ,. ~.- . n .z a . L,~ _. ~ ~,9 .

L 3.

1 i

,. t l

not been any detectable indication on the active site seismograph or the i peak shock recorders during quarry blasting activities due to normal .

explosions. However, DECO did not address potential ground effects due. l to accidental explosions of bulk quantities of ANF0, either at the RSI .

quarry or.during shipments to the quarry.  :

[' The staff has considered the potential ground effects due to the detonation of the maximum stored inventory of 80,000 pounds of ANFO at the RSI quarry, as well as the. detonation of a shipment of 40,000 pounds at the closest approach (two miles.from Fermi-2). In a previous review of.another nuclear '

power plant, the staff had analyzed the detonation of 82,000 pounds of

~ explosives. Its findings for that case were that the free field peak ground acceleration was.less than 0.02g at a. distance of 8700 feet. The Fermi-2 safety-related structures are designed to meet an operating basis earthquake acceleration _of 0.08g. Furthermore, the plant is designed to shut down safely after an earthquake as great as 0.15g. . Hence, in view of the Femi-2 seismic design values, as well'as the distances involved with respect to the postulated explosions, it is reasonable to expect that: '

the potential ground motion at the Fermi-2 plant site is acceptably low.

However, there is a possibility that differences in subsurface. geology between the Fermi-2 site and the previously analyzed site could affect l ground motion and hydrostatic pressures. Hence, DECO needs to provide a

• confirmatory analysis of the postulated explosions and their effects on

< ground motion and peak hydrostatic pressures in order to demonstrate that the hazard is insignificant. The analysis should include a review of the construction activities for Fermi-2 (as well as the inactive Fermi-1 plant) and list any damages to structures (onsite or offsitel due to the blasting.

that has occurred at the RSI quarry. Deco also needs to make availahle to the staff any reports or other results of investigations in regard to such damages.

Another potential hazard essessad is that related to;the dewatering activ-ities at the RSI quarry and +' potential for redirecting contaminated groundwater from its normal ....it to east course. According to Deco's de-scription of the location of the quarry, it is situated approximately one i mile away from the lake shore and three miles from the Femi-2 plant. The J. Fermi-2 FSAR (Fig. 2.4-24) indicates that the contour lines of water levels

! measured in the dolomite are approximately parallel to the lake shore. This ,

l means that the groundwater gradient is primarily toward the lake and normal F to the shoreline. Hence, the permeability of the fractured dolomite is likely to be greatest in a direction normal to the lake shore, where flow paths have been developed. On this basis, a dewatering operation is expected to i .. intercept flow primarily in " front" and "back" of the cuarry relative to i

the shoreline. The inflow from the sides is expected to be much less. In view of the above considerations, the staff concurs with Deco's assessment i that the dewatering activities at the RSI quarry would not have any dis-cernible effect on the groundwater flow at the Fermi-2 site.

l

..;a. ~ . .

r3 ' .

7

.2 -- _..au .-.. -._-.

_? ,

3-t 3.0 ~ CONCLUSIONS ,

The' staff has reviewed the potential hazards associated with the operation of and the potential explosion accidents at the RSI quarry and has deter-mined that present and future dewatering activities at the PSI quarry are not expected to have any appreciable effect on the established groundwater flow in the vicinity of the Fermi-2 site. With respect to postulated explosions of bulk quantities of the explosives used for RSI quarry blasting, the staff finds that they 'do not pose a significant hazard to the safe

-operation of the Fermi-2 plant. The staff has reason to believe that the associated ground motion and peak hydrostatic pressures may also be in-significant. However, Deco needs to provide a confirmatory analysis of the postulated explosions to demonstrate that the ground motion-and hydrostatic pressure change hazards are insignificant with respect to the Fermi-2 plant in order to fully allay the staff's concerns relative to the effects of the RSI quarry operation on the continued safe operation of the Fermi-2 plant.

Principal Contributor: K.lCampe,NRR 4

en

~

. . ..~ . a . . .aa .u- . . . ., . .  ; ~ . u . - .- a :. ~ a. z a .

s,; y-Q . -'

Mr. B. Ralph Sylvia .

Detroit Edison Company Femi-2 Facility

.cc: . .

Mr. Harry H. Voigt. Esq.. Ronald C. Callen LeBoeuf, Lamb, Leihy & MacRae Adv. Planning Review Section-1333 New Hampshire Avenue, N. W. Michigan Public Service Connission Washington, D. C. 20036 6545 Mercantile Way P. O. Box 30221 John Flynn, Esq. Lansing, Michigan 48909

-Senior Attorney .

Detroit Edison Company Regional Administrator, Region III 2000 Second Avenue U. S. Nuclear Regulatory Commission Detroit, Michigan 48226 799 Roosevelt Road .

Glen Ellyn, Illinois 60137 Mr. Dennis R. Hahn, Chief Nuclear Facilities and Environmental-

+

Monitoring Section Office Division of Radiological Health P. O. Box 30035 Lansing, Michigan- 48909 Mr. Steve Frost .

Supervisor-Licensing Detroit Edison Company Fermi Unit 2 6400 North Dixie Highway Newport, Michican 48166 Mr. Thomas Randazzo

. Director,. Regulatory Affairs Detroit Edison Company Fermi Unit. 2 6400 North Dixie Highway Newport, Michigan 48166 Mr. Walt Rogers U. S. Nuclear Regulatory Commission Resident Inspector's Office 6450 W. Dixie Highway Newport, Michigan 48166 Monroe County Office of Civil Preparedness

, 963 South Raisinville

!- Monroe, Michigan 48161 l

I i

i.