ML19340E952
| ML19340E952 | |
| Person / Time | |
|---|---|
| Site: | Vermont Yankee File:NorthStar Vermont Yankee icon.png |
| Issue date: | 01/12/1981 |
| From: | Rich Smith VERMONT YANKEE NUCLEAR POWER CORP. |
| To: | Eisenhut D Office of Nuclear Reactor Regulation |
| References | |
| RTR-NUREG-0737, RTR-NUREG-737, TASK-3.D.3.4, TASK-TM FVY-81-8, NUDOCS 8101160379 | |
| Download: ML19340E952 (19) | |
Text
.
VERMONT Y AN KEE NUCLEAR POWER CORPORATION e
SEVENTY SEVEN GROVE STREET B.3.2.1 RUTLAND, VERMONT 05701 FVY 81-8 n E,6v vo.
ENGINEERING OFFICE 1671 WORCESTER ROAD FRAMINGH AM, M ASS ACH USETTS o17ot v5LEPMONE S17 872 8100 January 12, 1981 United States Nuclear Regulatory Commission Washington, D. C.
20555 Attention:
Darrell G. Eisenhut, Director Division of Licensing
References:
(a) License No. DPR-28 (Docket No. 50-271)
(b)
USNRC Letter, D. G. Eisenhut to All Licensees of Operating Plants, dated October 31, 1980 (c) VYNPC Letter (WV'l 80-170) to USNRC, dated December 15, 1980
Subject:
Submittal of Information on NUREG 0737 Item III D.3 4: Control Room Habitability
Dear Sir:
The attached information is submitted in response to the documentation requirements of NUREG 0737, Item III D.3 4.
Additional information will be submitted per the schedule contained in Reference (c).
We trust the material provided is satisfactory; should additional bnforrdSion be required, please contact us.
u; d
tn 5
tc b[+-
Y ENi Very truly yours, Y
7,1 u s':_
9
'5E VERMONT YANKEE NUCLEAR POWER CORPORATION
,a D
R. L. Smith Licensing Engineer RLS/ dis Attachmen t B101160 37f
VERMONT YANKEE CONTROL ROOM HABITABILITY References 1.
USNRC, Standard Review Plan, Section 2.2.1-2.2.2, "Identi fica tion of Potential Hazards in Site Vicinity" 2.
USNRC, Standard Review Plan, Section 2.2 3, " Evaluation of Potential Accidents" 3
USNRC, Standard Review Plan, Section 6.4, " Habitability Systems" I
4.
USNRC, Standard Review Plan, Section 15.4 9, " Radiological Consequences of Control Rod Drop Accident (BWR)"
5.
USNRC, Regulatory Guide 178, " Assumptions for Evaluating the Habitability of a Nuclear Power Plant Cc,ntrol Room During a Postulated Hazardous Chemical Release" 6.
USNRC, Regulatory Guide 1 95, " Protection of Nuclear Power Plant Control Room Operators Against an Accidental Chlorine Release" 7
USNRC, NUREG-0570, " Toxic Vapor Concentration in the Control Room Following a Postulated Accidental Release" 8.
USNRC, NUREG/CR-0009, " Technological Bases for Models of Spray Washout of Airborne Contaminants in Containment Vessels" Introduction In response to item III.D.3 4 of the NRC letter dated May 7,1980, "Five Additional TMI-2 Related Requirements to Operating Reactors", control room habitability has been evaluated for the Vermont Yankee Nuclear Power Station.
Both radiological and chemical releases were considered. The above references were used in performing the evaluation. Where exceptions have been taken to the above documents, explanations are provided in Attachment 1.
I.
Radiological release:
Discussion The radiological releases considered were the following:
1.
DBA LOCA containment leakage 2.
Main Steam Isolation Valve leakage In total 30 day thyroid and whole body gamma doses excluding Main Steam Isolation valve leakage have been calculated to be 8.8 rem and 0.10 rem respectively. The 30 day thyroid and whole body gamma doses from main steam isolation valve leakage have been calculated to be 18 rem and 0.002 rem respectively.
The above calculated doses to the control room occupants, are within the limits specified in criterion 19 to 10CFR Part 50.
The following assumptions were used to evaluate control room radiological habitability:
1.
100% of noble gases and 50% halogens released instantaneously to the primary containment.
2.
The primary containment leak rate is 0.8% per day for the duration of the accident (30 days).
3 CAD system venting of 20 scfm begins after 192 hours0.00222 days <br />0.0533 hours <br />3.174603e-4 weeks <br />7.3056e-5 months <br /> and continues for the duration of the accident.
4.
The standby gas treatment system removes 95% of the radioiodine in the reactor building before exhausting to the stack.
5.
X/Q's are based on meteorological data from the year 1979 Critical sector values were generated in accordance with Regulatory Guide 1.145 The following X/Q's were used in the analysis TURBINE HALL ROOF VENT TO CR INTAKE TIME X/Q STACK TO CR INTAKE (MSIV LEAKAGE) 0-5 hr 1 979E-04 1 909E-03 5-1 hr 3 074E-07 1 909E-03 1-2 hr 2.740E-07 1.108E-03 2-8 hr 2.275E-07 4.231E-04 S-24 hr 1.685E-07 2.222E-04 24 - 96 hr 6.820E-08 1.214E-04 96 - 720 hr 4.879E-08 7.906E-05 6.
Occupancy factors from SRP 6.4: 100% from 0 to 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />, 60% from 24 to 96 hours0.00111 days <br />0.0267 hours <br />1.587302e-4 weeks <br />3.6528e-5 months <br />, 40% from 96 to 720 hours0.00833 days <br />0.2 hours <br />0.00119 weeks <br />2.7396e-4 months <br />.
7 An unfiltered inleakage rate of 20 cfm exists for the duration of the accident.
(FSAR value of 11 cfm based on calculations done by architect / engineer was increased to 20 to account for door openings.)
8.
No credit was takne for periodically purging the control room during periods of favorable meteorological conditions.
9 The MSIV leakage component was analyzed by assuming each of 4 valves leak at their tech spec limit for the duration of the accident. A factor of 100 was assumed for plateout of Elemental and Particulate Iodine in the main steam lines (based on methodolgoy in NUREG/CR-0009).
A leak rate of 15 per day was assumed to occur from the condenser (based on metholodology in SRP 15.4 9).
The leakage path was assumed to be out the turbine hall roof vents and into the control room intake.
Results As a result of the evaluation, no further safeguards are necessary to meet control room habitability requirements.
II.
Chemical Release Discussion The chemical releases considered were the following:
1.
All potentially hazardous chemicals stored on site. See Question 3 2.
Off site manu'/acturing, storage or transportaion facilities of hazardous chemicals within a 5 mile radius. See Attachment 1 Question 4.
The evaluation of control room habitability from protential hazardous chemicals was done according to criteria in Reference (5) and methodology in Reference (7). The following assumptions were used in the analysis:
1.
The volatility of a substance was determined by its vapor pressure.
For compressed and liquified gases and liquids whose normal boiling 0
points are far below the ambient temperature (21 C), instantaneous flashing (rapid formation of a puff), and continual vaporization by The drawing heat from the v.rroundings was taken into account.
values used for determining the vaporization rate were:
Atmospheric and Solar Radiation a.
2 qr = 212 cal /m -see b.
Earth Conduction 2
qd = 197 (210-T )t-5 cal /m -see B
TB = normal boiling of tie liquid c.
Forced Air Convection qc = 1.6 (210-T ) cal /m2_seo B
2.
Chemicals with normal boiling points above the ambient temperature will evaporate or vaporize into the atmosphere.
For chemicals stored outside of plant buildings, the rate of evaporation was determined by forced convection. For chemicals stored in areas of confined buildings, the rate of release was determined by gaseous diffusion in still air.
3 The meteorological parameters used were:
Windspeed = 1m/see blowing from the release point to the control room fresh air intake, Stability Class : F, X/Q = Calculated based on equations 2.2-1 and 2.2-9 given in Reference (7).
Where applicable, the effects of building wake and toxic gas density were factored inso the dispersion equations.
4.
The isolation of the control room was not considered in '.he analysis since Vermont Yankee has no hazardous chemical detection 3r emergency filter systems.
5 The rate of mass transfer (vaporization or evaporation) was assumed to be directly proportional to the surface area of the spill.
For spills occurring inside building, the maximum area was fixed by the room dimension. For epills occurring outside confined areas, the maximum area of the spill was estimated from the initial volume assuming a spill thickness of 1 cm.
6.
Toxicity limits not given in Reference (5) were obtained from the following references:
a.
Dangerous Pro;erties of Industrial Materials, N. Irving Sax, 4th Ed., Van Nostrand Reinhold Co., New York, 1975 b.
The Condensed Chemical Dictionary, Gessner G. Hawley, 9th Ed.,
Van Nostrand Reinhold Co., New York.
7.
The following general equation was used to determine the chemical concentration buildup in the control room, f*FM(X/Q)-fb freshairintakerateintothecontrolroom,mf where:
F =
S source strength, grams, or release rate, grams M =
sec-1 f*dispersionforpuffrelease,m-3, or vaporization release, see m-3 amount of chemical in the control room, grams A =
control room volume, m3 V =
Solution:
T f = A, exp ("hT) + exp (~hT),fFMfexp(ht) dt (eg. 1)
C=
o
O Initial amount of chemical in the control room -
=
assumed to be zero CT Concentration as a function of time post accident
=
in the control room, g/m3 The concentration buildup inside the control room as a function of time after the postulated chemical =f'11 was calculated. If the concentration did not exceed the toxicity limit as defined in Reference (5), it was concluded that the chemical could not result in the control room becoming uninhabitable.
III. On Site Chemicals The following assumptions were used in the analysis of control room habitability from onsite storage of potentially hazardous chemicals:
1.
Release of the total contents of the largest container of each l
hazardous chemical stored on site in excess of 100 pounds, unless i
the containers were interconnected in such a manner that a single failure could result in release from several containers..
2.
The vapor pathway to the control room from chemicals stored in plant buildings was through the storage location ventilation exhaust i
system and then into the control room via the fresh air intake.
3 Accident scenarios were considered for non-volatile chemicals that could release hazardous vapors or mists upon interation with the j
environment or as a result of a plant fire.
4.
The following general equation was used to determine the chemical concentration buildup in the control room from chemicals which vaporize inside plant buildings:
a.
Release rate out of the storage room E M
= R' -
R where:
R- = Chemical vaporization rate, gram sec-1 FR = ventialtion exhaust, m3 ee-1 3
VR = room volume, m3 M = mass airborne in the room, gram Solution:
T' b
(E T) f R' exp ( b t') dt' (eq. 2)
M'
=
exp R
R o
R
. b.
Concentration in the control room (substitution of equation 2 into equation 1)
F F
F exp (~p t) exp (h t) f R' exp (p t') dt' dt E
b T=
Q' p exp (2 (eq. 3)
T)
C R
o R
o R
The analysis assumes a release rate out of the room in which the spill occured via that room's ventilation, dispersed only by the effect of the adjacent building wake, and immediately enters the control room fresh air intake.
Results As a result of the evaluation, no potential hazard was defined for control room personnel from toxic chemical materils stored on site.
There are no modifications required to storage procedures or ventilation systems.
IV.
Off Site Chemicals The fol)owing assumptions were used in the analyses of control room habitabilit' from offsite manufacturing, storage or transportation facilities of hazardous materials:
1.
Hazardous chemicals have been identified as being shipped on a north-south rail line running at its closest point 756 meters from the control room fresh air intake.
An analysis was done for all shipments defined by Reference (5) as being frequent, i.e.,
30 per year for rail traffic.
'2.
The analyses was based on the maximum concentration accident, in which the quantity of the hazardous chemical considered was the instantaneous release of the total contents of the ? Argest tank car. This is the worst case compared with partial ruptures where the contents leak out in a steady flow. This was confirmed with a chlorine tank car having an assumed leak rate of 1 kg/sec as suggested in "The Accidental Episode Manual" prepared for the Environmental Protection Agency, January 1972.
3 The concentration buildup in the control room was the sum of the concentration due to the instantaneous puff and the concentration due to the continual vaporization of the remaining mass.
4.
The closest major highway by Vermont Yankee is Route 95, a south-north road located at its closest point approximately 2.5 miles from the station. Accidents resulting from truck shipments of hazardous materials are not considered in the analysis, since the type and quantity of toxic materials carried on the rail line is the most limiting case.
Results As a result of the evaluation, the following toxic chcsicals shipped via the rail line have been identified as potential hazards to the control room personnel:
a.
Anhydrous Ammonia b.
Chlorine c.
Vinyl Chloride d.
Carbon Dioxide e.
Methanol r
w
INFORMATION REQUIRED FOR CONTROL ROOM HABITABILITY EVALUATION 1.
Control Room Mode of Operation:
The normal mode of con trol room ventilation operation is recirculation with 2690 cfm fresh air makeup.
2.
, Control Room Characteristics a.
Air Volume of Control Room The air volume of the control room is 51,840 cu. ft.
b.
.The Control Room Emergency Zone All instrumentation and control necessary for safe plant shutdown are located in the control room. A controlled set of all drawings and procedures necessary to operate the plant are also kept in the control room.
The shift supervisor office, the operator's wash room, and kitchen are located in the control room.
c.
Control Room Ventilation System Schematic A one line diagram of the control ventilation system is included as Figure III.D.3 4.1.
d.
Infiltration Leakage Rate l
The infiltration leakage rate assumed in the analysis is 20 cfm.
I e.
HEPA Filter and Charcoal Adsorber Efficiencies There are no HEPA filters or charcoal adsorbers in the Vermont Yankee control room ventilation system.
f.
Closest Distance Between Containment Stack and Control Room Air Intake The control room ventilation intake is 241 meters from the stack in the SE direction, and is located on the east wall at elevation 286 ft. of the heating and ventilating room of the turbine hall.
g.
Control Room Layout and Chemical Storage Refer to Figure III.D.3 4.2.
h.
Control Room Shielding The Vermont Yankee control room is protected from radiation sources by extensive concrete shielding as shown in the FSAR in Figure 12.2-17 through 12.E-21.
Radiation from external sources is i
attenuated to low levels and is included in the analysis.
. 1.
Automatic Isolation Capability The Vermont Yankee Control Room does not have automatic isolation capability.
J.
Chlorine or Toxic Gas Detectors The Vermont Yankee Control Room does not have toxic gas detectors.
h.
Self-Contained Breathing Apparatus The Vermont Yankee control room is stocked with 6 full-face respirators, 3 scott air packs (45 min. tank with mask and regulator), and 3 bio packs, each with a one-hour Og supply.
1.
Bottled Air Supply Additional air supplies are stored on site ar.d include ten 45 minute scott air pack tanks and nine - I hour 02 tanks for the bio packs.
m.
Emergency Food and Water Supply The water supply for the Vermont Yankee control room is charcoal filtered well water. The Vermont Yankee Control Room contains emergency food supplies for 1 week for 7 persons.
n.
Cc:ntrol Room Personnel Capacity Under normal conditions the control room personnel occupancy is 5 Use of the tech support center is intended to limit the nu.mber of personnel in the control room under accident conditions to i
approximately 7 o.
Potassiur. Iodide Drug Supply The Vermont Yankee control room is not equipped with a potassjum iodide drug supply. KI liquid is stored on site in quantities large enough for the entire plant staff.
No credit has been taken for the use of thyroid blocking agents or self-contained breathing apparatus in the dose calculations performed.
3 On-Site Storage of Chlorine and Other Hazardous Chemicals - Total Amount Location and Size of Container a.
985 H SO4 - 4000 gallons located in the water treatment room.
2 The water treatment room is located at the south side of the turbine building at elevation 250'6" and a direct line distance of approximately 200 feet from the fresh air intake of the control room. The room is unventilated with 2 doorways. Concentrated
-w-
sulfuric acid is a non-volatile corrosive and presents no hazard as a toxic fume. A reaction between concentrated sulfuric acid and water could release sufficient heat to vaporize the acid as an aerosol.
The effect of this accident on control room habilitability is negligible since the water treatment room is a confined area on the opposite side of the turbine hall and at a lower elevation compared to the control room intake.
b.
50% NaOH - 4000 gallons, water treatment room sodium hydroxide is a non-volatile corrosive and presents no hazard as a toxic fume.
If NaOH and sulfuric acid are intermixed, a neutralization reaction occurs, resulting in release of heat, sodium sulfate and mists of entrained acid and caustic. The effect of this accident is negligible on control room habitability since the water treatment room is a confined area with no direct ventilation to the atmosphere.
c.
CO2 fire protection system - 55 bottles at 100 lbs/ bottle located in the cable vault.
30 bottles at 100 lbs/ bottle located in the switchgear room. The cable vault is located under the control room at elevation 262'6".
The switchgear room is located under the cable vault at elevation 248'6".
Upon the initiation of the fire system, there is a sounding of a local alarm and an alarm in the control r oom. The rooms are subsequently isolation with the closure of fire dampers.
The switchgear room and cable vault can be purged in a controlled manner to the outside through existing ventilation or through portable exhaust hoses to the outside, approximately a direct line distance of 150 feet from the control room fresh air intake.
For this reason, the fire protection system is not considered a hazard to control room habitability.
d.
Chesterone - 55 gallon drums located in the machine shop warehouse at the south side of the turbine hall elevation 252'6".
The machine shop has 2 roof exhaust fans located at a direct line distance of l
approximately 200 feet from the control room fresh air intake.
Chesterone is a liquid cleaner consisting of perchloroethylene which has a toxicity limit in air of 100 ppm (740 mg/m3).
Analysis indicates chesterone is not a hazard to control room habitability.
e.
Chloroethane - 55 gallon drums located in the machine shop warehouse area.
Chloroethane is a liquid cleaner conisting of 1,1,1-trichloroethane which has a toxicity limit in air of 350 ppm (2084 mg/m3)
Analysis indicates chloroethane is not a hazard to control room htbitability.
f.
Unisol - 55 gallon drums located in the machine shop - warehouse area.
Unisol is a solvent degreaser consisting of methylene chloride 155',
perchlorethylene 355 and 1,1,1-trichloroethane. Methylene chloride has a toxility limit in air of 250 ppm (948 mg/m3),
Analyses indicate unisol is not a hazard to control room habitability.
g.
Dry cleaning fluid CpCl F3 3 - 290 pounds located in the water treatment room.
Trifluorotrichloroethane has a toxicity limit in air of 1000 ppm (8400 mg/m3)
Analysis indicates trifluorotrichloroethane is not a hazard to control room habitability.
h.
Morpholice - 35 gallon drums located in water treatment room.
Morpiolene is a boiler additive consisting of tetrahydro-1, 4-oxr;ine which has a toxicity limit in air of 20 ppm (78 mg/m3)
Analysis indicates morpholine and its fire os; products of NOX do not present a hazard to control room habitability.
i.
Hydrazine - 35 gallon drums,15% aqueous solution, located in the water treatment room.
Hydrazine has a toxicity limit in air of 1 ppm (1.4 mg/m3), and is not considered a flammable hazard in concentration of 155.
Analysis indicates hydrazine is not a hazard to control room habitability.
l j.
Sodium hypochlorite - H O (105) - 4000 gallon tank located in the 2
intake structure building on the east side of the site.
The intake structure building is approximately 300 straight line feet from the control room fresh air intake and has no forced ventilation to the atmosphere.
Sulfuric acid (985) - 4000 gallon tank located in the intake
~
structure building.
l Toxic fumes would occur only if the contents of the two tanks were allowed to intermix. This is not considered possible since both l
tanks are contained within separate concrete dikes, sized to support the entire tank contents. There are floor drains in the bottom of the dikes that flow to the intake structure, k.
No chlorine is stored on site.
t l
I
4.
OFF-SITE Manufacturing, Storage or Transportation Facilities of Hazardous Chemicals a.
The only manufacturing or storage facility within 5 miles of Vermont Yankee is Erving Industries. They were contacted and Indicated they do not store or use any hazardous chemicals that may result in toxic fumes upon release into the atmosphere or as a byproduct from combus tion.
b.
N/A See 4.a c.
N/A See 4.a d.
The following chemicals are transported by the Central Vermont Railway on a rail line which is located at its closest point, 756 meters from the control room fresh air intake.
Indicated weights and frequency of shipment are average values.
Chlorine - 180,000 lbs/ tank, 260 cars per year Nitrogen Fertilizer - 95,000 lbs/ tank, 52 cars per year Ethyl Alcohol - 133,000 lbs/ tank, 208 cars per year Anhydrous Ammonia - 167,000 lbs/ tank, 58 cars per year Vinyl Chloride - 168,000 lbs/ tank, 156 cars per: year Propane - 140,000 lbs/ tank,1560 cars per year Methanol - 170,000 lbs/ tank, 156 cars per year Carbon Dioxide - 145,000 lbs/ tank,104 cars per year Hydrochloric Acid - 70,000 lbs/ tank,104 cars per year Caustic Soda Liquid - 190,000 lbs/ tank, 52 cars per year Sodium Nitrate - 150,000 lbs/ tank, 52 care per year The following chemicals are transported by the Boston and Maine Railroad on a rail line which is located at its closest point, 756 meters from the control room fresh air intake. The Manager of Safety could not supply average weights per tank car but estimated the quantities to be 10,000 - 30,000 gallons.
Garbage Tankage - 90 cars per year Wines - 58 cars per year Fish Meal - 10 cars per year Charcoal Briquets - 4 cars per year Caustic Soda - 38 cars per year Sodium Nitrate - 29 cars per year Sodium Sulfate - 175 cars per year Calcium Carbide - 3 cars per year Chlorine - 127 cars per year Carbone Dioxide - 171 cars per year Argon - 48 cars per year Nitrogen - 12 cars per year Butyl Alcohol - 325 cars per year
t 13-l Octyl Alcohol - 26 cars per year Ethyl Alcohol - 116 cars per year i
Sulphuric Acid - 84 cars per year Muriatic Acid - 28 cars per year Phosphorus, N.E.C
- 16 cars per year Anhydrous Ammonia - 18 cars per year l
Sulphur Dioxide - 27 cars per year Fertilizer Ammoniating Solution - 11 cars per year Fertilizer Compounds - 24 cars per year Fuel Oil - 4 cars per year Propane - 469 cars per year Sulphide Water - 14 cars per year From the above lirt of placarded materials shipped on the rail line, the following chemicals were analyzed and their toxicity limits are l
listed:
Chemic31 Toxicity Limit Chlorine 45 mg/m3 Vinyl Chloride 2600 mg/m3 Anhydrous Ammonia 70 mg/m3 l
Methanol 520 mg/m3 Nitrogen Simple Asphyxiant (33% by volume)
Carbon Dioxide 1840 mg/m3 (15 volume)
Ethyl Alcohol 2057 mg/m3 Argon Simple Asphyxiant (33% by volume) l Sulfuric Acid 2 mg/m3 LPG Simple Asphyxiant (33% by volume) 5 Technical Specifications There are presently no technical specifications effecting control i
room habitability.
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