ML20207H117
| ML20207H117 | |
| Person / Time | |
|---|---|
| Site: | Vogtle  |
| Issue date: | 12/30/1986 |
| From: | Bailey J GEORGIA POWER CO. |
| To: | Youngblood B Office of Nuclear Reactor Regulation |
| References | |
| GN-1275, NUDOCS 8701070462 | |
| Download: ML20207H117 (4) | |
Text
e Georgia Pcwer Company Pc t Offica Box 282 Wayn:sboro, Georgia 30830 Telephone 404 554-9961 404 724-8114 Southern Company Services, Inc.
Fest Office Box 2625 Birmingham, Alabama 35202 Telephone 205 870-6011 VOgtle Project December 30, 1986 Director of Nuclear Reactor Regulation File:
X7N16 Attention:
Mr. B. J. Youngblood Log:
GN-1275 PWR Project Directorate #4 Division of PWR Licensing A U. S. Nuclear Regulatory Commission Washington, D.C.
20555 NRC DOCKET NUMBER 50-424 CONSTRUCTION PERMIT NUMBER CPPR-108 V0GTLE ELECTRIC GENERATING PLANT - UNIT 1 TECHNICAL SPECIFICATIONS
Dear Mr. Denton:
Attached for your staff's review is an analysis supporting our proposed revision to Specification 3/4.3.3.7, " Chlorine Detection Systems" as discussed with your staff during the meeting which took place on December 22 and 23, 1986 in Bethesda.
If your staff requires any additional information, please do not hesitate to contact me.
Since rely,
e.y e--
x
. A. Bailey Project Licensing Manager JAB /sm xc:
R. E. Conway NRC Regional Administrator R. A. Thomas NRC Resident Inspector J. E. Joiner, Esquire D. Feig B. W. Churchill, Esquire R. W. McManus (w/o att.)
M. A. Miller (2)
L. T. Cucwa B. Jones, Esquire Vogtle Project File G. Bockhold, Jr.
0964V
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8701070462 B61230 hi t
PDR ADOCK 05000424
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PDR 4
LIMITS FOR OFFSITE STORAGE OF CHLORINE Table C-2 of Regulatory Guide 1.78 provides weights of chemicals that require consideration in control room evaluations for a 50 mg/m3 toxicity limit, F stability category, and control room air exchange rate of 1.2 per hour.
The procedure presented in Appendix A of the Regulatory Guide was used to adjust the weights given in Table C-2 to appropriately account for the actual toxicity limit (45 mg/m3) and actual VEGP control room air exchange rate (1.24 per hour).
The adjustment is shown in Exhibit 1.
For chlorine stored or transported 4 to 5 miles from the control room, as is the case for truck transport on highway 23 (refer to FSAR Table 2.2.3.6), weights of 52,258 lbs. or greater need to be considered in control room evaluations.
Since the maximum quantity transported by truck is only 2,000 lbs. (1 ton), this source needs no further evaluation.
Similarly, for chemicals stored or transported 3 to 4 miles from the control room, as is the case for the Savannah River Plant (SRP) (refer to FSAR Table 2.2.3-14) weights of 28,742 lbs. or greater need to be considered c
in control room evaluations.
Since the maximum quantity stored in an individual container at the SRP is only 2,000 lbs, this source does not require further evaluation.
Hence, the release of chlorine from either of these two offsite sources is not a design basis event with respect to control room habitability.
278/CAC/1-2
NOTE:
Subsequent to the analysis described in FSAR section 2.2 3, it was determined that the 34 tons of chlorine at SRP was stored in individual 1 ton cylinders in lieu of a single 34 ton container as analyzed in the FSAR.
The FSAR will be updated in a future amendment.
TABLE 1 i MAXIMUM WEIGHT (LBS)I DISTANCE I CONTROL!
l 0F CHEMICAL STORED l FROM I
ROOM l STABILITY SOURCE IN ONE CONTAINER I
CONTROL ROOM l TYPE l CATEGORY i
i l
l Truck on 1
2000 lbs.
I 4.72 miles I
C l
F Highway 23 l
l (7600 meters) l l
l l
l 1
1 I
I I
SRP l
2000 lbs.
I 3 5 miles l
C I
F I
I (5633 meters) l I
l l
1 Additionally, using the above described methodology it is shown (Exhibit 1) that chlorine stored 1 to 2 miles away from an unisolated control room should be considered if stored in containers in excess of 2,177 lbs. (1.09 tons).
Therefore, it is conservative to assume that 1 ton chlorine cylinders could be stored at a distance of 2 miles or greater without affecting control room habitability.
278/CAC/2-2
EXHIBIT 1 (1)
For distances of 4 to 5 miles from the control room, the actual weight which must be considered in control room habitability evaluations is:
1.2hr-1 = 52,258 lbs. = actual 60,000 lbs. x 45 mg/m3 x
50 mg/m3 1.24hr-1 weight (Table C-2 (Adjustment (Adjustment weight) for actual for actual toxicity control room limit) air exchange) where, '3,000 ft3/ min x 60 min = 1.24 for VEGP Control Room
- 145,326 ft3 hr hr (2)
Similary, for distances of 3 to 4 miles from the control room, the weight which must be considered in control room habitability evaluations is:
33,000 lbs x 45 x
1.2
= 28,742 lbs 50 1.24 (3)
For chlorine stored at distances 1 to 2 miles from the control room, the weight which must be considered in control room habitability evaluations is:
2,500 lbs x 45 x
1.2
= 2,177 lbs 50 1.24 3000 ft3 min = Flowrate of air into the unisolated VEGP Control Room (Refer to FSAR Table 2.2 3-19) 145,326 = Net free volume for VEGP Control Room as used in the chlorine analysis (refer to GPC to NRC letter dated February 19, 1986, file number GN-808).
278/CAC/1E-1