ML20245H867
| ML20245H867 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 06/27/1989 |
| From: | Michael Ray TENNESSEE VALLEY AUTHORITY |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| RTR-NUREG-0737, RTR-NUREG-737, TASK-3.D.3.4, TASK-TM TAC-00155, TAC-00156, TAC-00157, TAC-155, TAC-156, TAC-157, NUDOCS 8906300126 | |
| Download: ML20245H867 (8) | |
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TENNESSEE VALLEY' AUTHORITY CHATTANOOGA.. TENNESSEE 37401 SN 1578 Lookout Place-JUN 271989.
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l U.S.. Nuclear Regulatory Commisslon ATTN:. Document Control Desk' Hashington, D.C.
20555 Gentlemen:
In the Matter of
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Docket Nos. 50-259 Tennessee Valley. Authority
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50-260 50-296 BR0HNS FERRY NUCLEAR PLANT (BFN).
NUREG-0737, ITEM III.O.3.4, CONTROL ROOM HABITABILITY - HAZARDOUS CHEMICALS (TAC NUMBERS 00155, 00156 AND 00157)
This letter is in response to the request contained in NRC's letter dated October 21, 1988. NRC requested TVA verify that its conc'iusions on control room habitability after a postulated hazardous chemical release other than chlorine (initially provided to NRC by letter dated March 17, 1981) remain J
accurate.
Enclosures 1, 2 and 3 contain the results of the reevaluation.
. Based upon this reevaluation, we have concluded that the BFN main control room
. remains. habitable.
There are no commitments contained in this letter.
If you have any questions, please telephone Patrick Carier at (205) 729-3570.
Very truly yours, TENNESSEE VALLEY AUTHORITY 1
Manager (, Nuclea icensing and Regulatory Affairs Enclosures cc: See page 2 8906300126 890627
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. U.S. Nuclear Regulatory Commission-JUN 271989 cc (Enclosures):
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Ms. S. C. Black, Assistant Director for Projects TVA Projects Division U.S. Nuclear Regulatory Commission
-One White Flint, North 11555 Rockville Pike Rockville, Maryland 20852 Mr. B. A. Wilson, Assistant Director for. Inspection-Programs TVA Projects Division U.S. Nuclear Regulatory Commission Region II 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323 NRC Resident Inspector.
Browns Ferry Nuclear Plant Route 12, Box 637 Athens, Alabama 35609-2000
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ENCLOSURE 1 BR0HNS FERRY NUCLEAR PLANT (BFN)
CONTROL ROOM HABITABILITY EVALUATION Criterion 19 of 10CFR50, Appendix A " Control Room", requires that a control room be provided from which actions can be taken to operate the nuclear power unit safely under normal conditions and to maintain it in a safe condition under accident conditions.
Release of hazardous chemicals can potentially result in the control room becoming uninhabitable.
This report summarizes the results of BFN's evaluations of the habitability of the main control room following a postulated hazardous chemical release.
A reevaluation of hazardous materials has been performed following the guidelines of Regulatory Guide 1.78
" Assumptions for Evaluating the Habitability of a Nuclear Power Plant Control Room During a Postulated Hazardous Chemical Release" (Revision 0, June 1974).
The results of our reevaluation are as follows:
- 1) Chemicals shipped by rail will not affect main control room habitability since all major rail lines lie outside the five mile radius specified in Regulatory Guide 1.78.
- 2) There are no industrial or military facilities within the five mile radius specified in Regulatory Guide 1.78.
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- 3) Chemicals transported by road were determined not to affect main control room habitability due to the remote location of the plant and the lack of industrial activities in the area.
Major interstate routes I-65, I-59 and I-20 and U.S. Highway 72 are not within a five mile radius of the plant site specified in Regulatory Guide 1.78.
State route 20 is within the five mile radius but is a rural route which is not used as a major transportation route for hazardous chemicals.
- 4) Hazardous chemicals stored onsite in quantitles greater than one hundred pounds were evaluated. shows the chemical type and the quantitles stored. Also provided are the results of the habitability analysis for each chemical.
The analysis of onsite hazards considered the size of the chemical container and its distance to the main control room ventilation intake.
The container of each chemical that resulted in the highest concentration at the main control room ventilation intake was assumed to rupture. Adverse wind direction and Pasquill Stability Class G meteorological conditions were assumed in the analysis to maximize the chemical's concentration at the intake.
The analysis showed that the concentration of vapors from a chemical release remain below the toxicity l
limit for hazardous chemicals stored onsite in quantities greater than one hundred pounds.
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J ENCLOSURE 1 (Continued)
BR0HNS FERRY NUCLEAR PLANT (BFN)
CONTROL ROOM HABITABILITY EVALUATION I
- 5) In situations where hazardous chemicals are shipped by barge past a
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nuclear power facility, Regulatory Guide 1.78 provides that analysis of a specific hazardous chemical for its effect on control room habitability is i
necessary only if the shipment frequency of that chemical equals or i
exceeds 50 shipments per year and the quantity, per shipment of the hazardous chemical, is greater than the adjusted quantity shown in Table C-2 of the Regulatory Guide for the type of control room being evaluated. This interpretation of Regulatory Guide 1.78 is consistent with the interpretation contained in the NRC's letter to TVA, dated October 21, 1988. shows the material type and frequency of hazardous and nonhazardous materials which pass the BFN site each year.
Only three materials, diesel fuel oil, fertilizer and crude petroleum, are barged past BFN fifty or more times per year.
Fertilizer and crude petroleum are not considered to be hazardous chemicals and thus do not present any toxicity hazard.to the main control room. As discussed above for chemicals stored onsite, diesel fuel oil was evaluated and was determined not to affect main control room habitability.
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ENCLOSURE 2 BROWNS FERRY NUCLEAR PLANT (BFN)
HAZARDOUS CHEMICALS STORED ONSITE IN I
QUANTITIES GREATER THAN ONE HUNDRED POUNDS Chemical Type Quantity Stored (Maximum or Worst Case Analyzed) j Results of Analysis Trichloromethane (Degreaser) 220 gallon drum I
The concentration of trichloromethane is essentially zero at the main control room intake.
1 Diesel Fuel Oil 158,000 gallon underground tank The rate of vaporization of diesel fuel oil is not sufficiently high to produce toxic concentrations in the main control room.
Ethylene Glycol 15,000 gallon drum The vapor pressure of ethylene glycol is less than 10 Torr and will not produce toxic concentrations in the main control room.
Gasoline 10,000 gallon tank Analysis of gasoline is bounded by diesel fuel analysis.
Hydrazine 625 gallon reservoir The low vapor pressure of hydrazine will preclude toxic concentrations in the main control room.
Lube Oil 58,000 gallon tank The low vapor pressure of lube oil will prevent the production of toxic concentrations in the main control room.
Methyl Ethyl Ketone 165 gallon tank The ccincentration of methyl ethyl ketone is essentially zero at the main control room intake.
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ENCLOSURE 2 (CONTINUED)
BROWNS FERRY NUCLEAR PLANT (BFN)
HAZARDOUS CHEMICALS STORED ONSITE IN QUANTITIES GREATER THAN ONE HUNDRED POUNDS Chemical Type Quantity Stored (Maximum or Worst Case Analyzed)
Results of Analysis Mineral Spirits 660 gallon drum The low vapor pressure of mineral spirits will preclude toxic concentrations in the main control room.
PCB 011 3,741 gallon capacitor PCB 'is not toxic even though it is a carcinogen.
Phosphoric Acid 330 gallon drum The concentration of. phosphoric acid is essentially zero at the main control room intake.
Sodium Hydroxide 3,050 gallon tank The vapor pressure of sodium hydroxide is less than 10 Torr and will not produce toxic concentrations in the main control room.
Sodium Hypochlorite 8,500 gallon tank Sodium hypochlorite is an alkaline.
The release of chlorine due to dissociation will be negligible.
Sulfuric Acid 3,418 gallon tank The vapor pressure of sulfuric acid is less than 10 Torr and will not produce toxic concentrations in the main control room.
Carbon Dioxide 17 ton tank The rupture of the carbon dioxide tank will r.ot produce toxic concentrations in I
the main control room.
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' ENCLOSURE 2"(CONTINUED)
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.. BROWNS FERRY' NUCLEAR PLANT-(BFN)
Li HAZARDOUS CHEMICALS STORED ONSITE IN
-QUANTITIES GREATER THAN ONE HUNDRED POUNDS'
' Chemical Type
' Quantity Stored (Maximum or Horst Case Analyzed)-
Results of Analysis-Nitrogen 6,000 gallon tank Rupture of'al? nitrogen tanks will only produce a minimal l increase in.the control room nitrogen concentration.
' Hydrogen 3,000 gallon trailer The analysis for hydrogen is bounded by the nitrogen analysis.
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, ENCLOSURE 3 j
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. BROWNS FERRY NUCLEAR PLANT.(BFN)..
CHEMICALS BARGE 0 PAST THE BFN SITE i
i Shipment Frequency J
LChemical: Type (Barges per Year) i 3
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~ Diesel Fuel.011:
176 Fertilizer 76.
-Crude' Petrol'eum 54.
.i-Acrylonitrile 46~
Naphtha' 40 Chlorine-26
- -Vinyl Acetate and Styrene 12 Asphalt 7
y Distillate Fuel'011 7
'. Vegetable. 011 4
~ Gasoline' 2
Nitrogen Solution 2.-
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