ML20072M136
| ML20072M136 | |
| Person / Time | |
|---|---|
| Site: | Seabrook  |
| Issue date: | 03/29/1983 |
| From: | Devincentis J PUBLIC SERVICE CO. OF NEW HAMPSHIRE, YANKEE ATOMIC ELECTRIC CO. |
| To: | Knighton G Office of Nuclear Reactor Regulation |
| References | |
| SBN-495, NUDOCS 8304010139 | |
| Download: ML20072M136 (12) | |
Text
.
MI SEABROOK STATION
% OfRee:
1671 Worcesser Road M " * ** * " " 03701 Pubic Service of New Hompetse (617)- 872-s100 March 29, 1983 S BN-495 T.F. B7.1.2 United States Nuclear Regulatory Commission Washing ton, D. C. 20555 Attention:
Mr. George W. Knighton, Chief Licensing Branch No. 3 Div: sfon of Licensing
Reference:
(a) Construction Permits CPPR-135 and CPPR-136, Docket Nos. 50-443 and 50-444
Subject:
Responsa to SER Outstanding Issue #1 (SER Section 2.3.1; Meteorological and Ef fluent Treatment Systems Branch)
Dear Sir:
We have enclosed a response to SER Outstanding Issue #1 which is addressed in SER Section 2.3.1.
The enclosed response is in the form of a revision to our response to your Request for Additional Information (#451.11) which will be incorporated in OL Application Amendment 49.
Very truly yours, YANKEE ATOMIC ELECTRIC COMPANY b
t John DeVincentis Project Manager ALL/dsm V
cc: Atomic Safety and Licensing Board Service List 8304010139 830329
~
PDR ADOCK 05000443 E
PDR 1000 Elm St., P.O. Box 330. Monchester, NH 03105 Telephone (603) 669-4000 TWX 7102207595
e ASLB SCRVICE LIST Roberta C. Pevear Rep. Deverly Hollingworth Designated Representative of Coastal Chamber of Commerce the Town of Hampton Falls 209 Winnacunnet Road Drinkwater Road 0384M Hampton, N!! 03842 Itampton Palls, (H!
Mrs. Sandra Gavutis William S. Jordan, III, Esquire Designated Representative of Harmon & Weiss the Town of Kensington 1725 I Street, N.W.
RFD 1 Suite 506 East Kingston, NH 03827 i
Washington, DC 20006 Edward J. !!cDe rmot t. Esquire E. Tupper Kinder, Esquire Sanders and McDermott Assistant Attorney General Professional Association Office of the Attorney General 408 Lafayette Road 208 State House Annex Hampton, NH 03842 Concord, NH 03301 Jo Ann Shotwell, Esquire Roy P. Lessy, Jr., Esquire Assistant Attorney General Of fice of the Executive Legal Director Environmental Protection Bureau U.S. Nuclear Regulatory Commission Department of the Attorney General Washington, DC 20555 One Ashburton Place, 19th Floor Boston, MA 02108 Robert A. Backus, Esquire Ms. Olive L. Tash 116 Lowell Street Designated Reoresentative of P.O. Box 516 the Town of Brentwood Manchester, NH 03105 R.F,D. 1, Dalton Road Brentwood, NH 03833 Philip Ahrens, Esquire Edward F. Meany Assistant Attorney General Department of the Attorney General Designated Representative of the Town of Rye Augusta, NE 04333 155 Washington Road Rye, NH 03870 David L.
Lewis Calvin A. Canney Atomic Safety and Licensing City Manager Board Panel City Hall N,uclear Regulatory Commission U.S.
126 Daniel Street Rm. EfK-439 Pcetsmouth, NH 03801 Washington, DC 20555 Mr. John B.
Tanzer Designated Representative of l
the Town of Hampton 5 Morningside Drive Hampton, Nil 03842
451.11 a.
Identify meteorological conditions (including extreme temperatures, pressure, humidity, and windspeeds) considered in the design of auxiliary systems and components (e.g., the diesel generator-combustion air ; intake and exhaust ' system discussed in'Section 9.5.8).
b.
Provide the bases for the selected. values (including the magnitude and duration),
c.
Compare the selected values with severe or extreme meteorological conditions observed in the region through 1981 (through January 1982 for extreme minimum temperatures),
d.
Compare the selected values with those presented in Section 2.3.1.2 for tornadoes and hurricanes, extreme winds (e.g.,
100-year recurrence), extreme temperatures (100-year recurrence; see NUREC/CR-1390, " Probability Estimates of Temperature Extremes for the Contiguous United States"), and other extreme conditions for atmospheric moisture and precipitation.
RESPONSE
a.
Meteorological conditions considered in the design of auxiliary systems and components, exclusive of the diesel generator air intake and exhaust system, are summarized below; the environmental conditions for the diesel generator air intake and exhaust system are addressed in RAI 430.130.
Extreme Outdoor Temperatures Maximum 88 F Minimum 0 F Relative Outdoor Humidity Maximum 100%
Minimum 10%
The above temperature and humidity extremes were utilized in the design of the HVAC systems for all safety-related buildings. The HVAC systems are intended to maintain temperature and humidity environments within the buildings as specified in FSAR Figure 3.ll(B)-1 (Service Environment Chart) under the outdoor conditions specified above.
Seismic Category I structures and certain non-Seismic Category I structures, as listed in Subsection 3.8.4.1, were designed for wind velocities as follows:
Severe Environmental Load:
A wind speed of 110 mph at 30 feet above ground for a 100-year return.
Extreme Environmental Load:
A total maximum tornado wind velocity (translational plus rotational of 360 mph).
Seismic Category 1 structures and certain non-Seismic Category I structures were designed for the following atmospheric pressure change accompanying the. design basis tornado:
Total pressure change due to passage of tornado:
3 psi Rate of pressure change:
2 psi per second b.
The bases for specification of temperature extremes are actual measured regional temperature distributions for Massachusetts presented in "ASHRAE Handbook of Fundamentals",
Chapter 22 Table 1, page 380,1967 Edition. The 2-1/2 %
values (Summer) and 97-1/2% values (Winter) of the distributions were used.
The bases for the selection of the humidity range is the assumption that relative humidities at or near 100% occur during fog, dew formation and precipitation which are f requently observed in this climate.
Relative humidities less than 10% are not observed under the climatic conditions affecting this site.
The bases for the design wind velocities and atmospheric pressures for Seismic Category I structures and certain non-Seismic Category I structures (listed in Subsection 3.8.4.1) are discussed in Subsection 2.3.1.2.
c.
Extreme wind speed and ambient-temperature conditions observed in the Seabrook Station site region through December 1978 were reported in Seabrook FSAR Tables 2.3-4, 2.3-11 and 2.3-12.
Seabrook FSAR Table 2.3-4 shows that the fastest mile wind speed recorded was 87 mph (Boston, September 1938);
SB FSAR Tables 2.3-11 and 2.3-12 show that the maximum and minimum ambient temperatures observed were 104 F (Boston, July 1911) and -39 F (Portland, February 1943),
respectively. None of these extreme environmental conditions have been exceeded at their respective stations as of January 1982.
Extreme temperatures which are more representative of the site were determined through an analysis of the Pease AFB (Portsmouth, N.H.) temperature data for the period April 1956 through June 1982. The pertinent results of this analysis are contained in our response to part (d) below.
A National Severe Storm Center list of tornado data for the Seabrook Station site region for the period 1950-1981
( Re f e rence 1) indicates that the closest initial tornado touchdown point recorded was approximately 2 miles f rom the site on July 1, 1968.
This tornado was rated 1 on the
Fujita-Pearson scale estimate of force (73-112 mph winds).
The three strongest tornadoes recorded as having initially touched down within 50 miles of the site during this same 32-year period-were rated 3 on the Fujita-Pearson scale estimate of force (158-206 mph winds). The estimated wind load of these three extreme tornadoes is well below the design extreme environmental tornado wind velocity of 360 mph.
NOAA Technical Report NWS 23 (Reference 2) provides a list of hurricanes with observed or estimated minimum central pressures less than 29.00 inches Hg which have occurred along the U.S. east coast during the 79-year period 1900-1978.
According to NWS 23, the minimum hurricane central pressure estimated to have occurred within 150 nautical miles of the U.S. east coast during this period was 27.44 inches Hg on September 10, 1919 off the Florida coast. Minimum hurricane central pressures along the New England coast have generally been higher due primarily to decreasing water temperatures toward the north. The lowest pressure ever recorded in the site region (e.g., at either Boston, Concord or Portland NWS) was 28.40 inches Hg recorded in Portland on December 2,1942 (Reference 3).
Thus, the diesel generator air intake and exhaust design hurricane and northeastern storm pressure of 26 inches Hg as discussed in SB FSAR Section 9.5.8 and in SB i
RAI 430.130 is conservative when compared to the minimum pressures which have been observed in the site region, d.
The 100-year return period wind speed at 30 feet above ground is reported in FSAR Section 2.3.1.2 as 110 mph.
This was the wind velocity used for the severe environmental wind load.
The design basis tornado wind velocities and atmospheric pressures are those outlined for Region I in Regulatory Guide 1.76 (Reference 4).
The design basis hurricane or northeastern storm pressure of 26 inches Hg more conservative than the probable maximum hurricane central pressure of 26.80 reported for the New England coastline by NWS 23 (Reference 2).
l According to NUREG/CR-1390 (Reference 5), the 100-year return l
period maximum and minimum temperatures for the Seabrook site are approximately 106 F and -32 F, respectively. These extreme temperatures were obtained by the interpolation between isotherms shown on the maps of 100-year maximum and l
minimum temperatures contained in NUREG/CR-1390.
The data base used to develop these maps does not include, l
however, temperature data from any reporting stations near the Seabrook site and also shows a strong influence of inland stations on the isotherm maps of 100-year maximum and minimum l
temperatures. Thus, NUREG/CR-1390 does not, in our opinion, j
adequately account for the modification of extreme j
temperatures due to the proximity of Seabrook to the Atlantic I
- Ocean, i
I
Our analysis (Reference 6) _ of extreme temperature data collected at nearby weather-stations (Portsmouth, NH (Pease AFB)), ' climatological. stations (Rockport, MA, Sa nfo rd, ME, and Greenland, NH) and at the Seabrook site results in 100-year return period maximum and; minimum. hourly temperatures for the Seabrook site of 1020F and -210F, respect ively.
(These values were computed following the methodology found in NUREG/CR-1390.)
Since the design of some equipment is more dependent on the maximum and minimum temperatures averaged over a period of 4
greater than one-hour, extreme temperatures for 2, 4, 8,12, and 24-hour averaging periode were'also determined.
The values are listed below:
100-Year Return Period Temperature (OF) l Averaging Period Maximum Minimum 2-Hour 102
-21 4-Hour 101
-21 8-Hour 99
-20 12-Hour 96
-19 24-Hour 92
-16 In addition to the above hypothetical 100-year return period temperature extremes, our analysis indicated that the highest hourly temperature recorded during the period 1957 through 1981 at Pease AFB (Portsmouth, N.H.) was 101 F on July 1, 1964 (hour 13). The hottest contiguous 24-hour period-containing this temperature extended from June 30 (hour 15) through July 1 (hour 14). The hourly temperature progression for this period is provided in Table 451.11-1.
The.five hottest and five coldest contiguous 24-hour hourly temperature periods recorded at Pease AFB for the data base i.
of 1957 through 1981 are presented by Table 451.11-2.
e.
Calculations show that resulting maximum ambient tempera ture s experienced by equipment located in ventilated compartments of concrete structures are functions not only of the l
temperature extremes, but also are functions of the diurnal variations in the outside temperature and the thermal inertia of the concrete structures. Concrete walls and slabs have thermal capacitance associated with them, thus the heat transfer occurring between the structures and the ventilation air damp out the daily temperature fluctuations that would tend to occur within the ventilated areas.
The benefit that l
is gained by accounting for this thermal inertia can be l
determined by calculating the room temperature as a function l
of time of day.
From Table 45L.11-2, which shows maximum temperatures of 100 F on August 3, 1975, the hottest 24-hour average 0
external temperature was dete rmined as 86.60F.
Since our l
analysis of temperature extremes predicts a 100-year return maximum temperature of 102 F, the hourly temperature progression data for this day was thus adjusted upward by 28F, in order to envelope the 100-year ~ return conditions.
As a typical example of the ef fect that.the thermal inertia of concrete structures can have, it was found that the anticipated maximum temperatures at the 21'-6" elevation of the Control Building in the Emergency Switchgear Rooms would be decreased f rom 118 F to 113.5 F, and in the Battery Rooms from 1090F to 103 F, refer to Table 451.11-3 for details.
In other words, by accounting for the diurnal variations and the thermal inertia associated with the concrete structures, the maximum temperatures that would occur in ventilated rooms would be lowered by approximately 4.5 to 6.00F.
Based on our probabilistic evaluation of temperature extremes using the Fease AFB meteorological data (Reference 6), the outdoor temperature exceeding the extreme design temperature of 88 F occurs during a small fraction (0.25%) of the plant life. Mo reove r, it can be demonstrated that considering the thermal inertia of the building structures and the diurnal variation of temperature, the maximum temperature within a ventilated room will not exceed 1040F as long as the peak temperature of a hypothetical day does not exceed 910F.
The temperature of the Control Room will not exceed 80 F.
The fraction of the plant life when the temperature exceeds 910F is less than 0.105%.
Based on the above, we have determined that there will be no significant degradation of equipment within the buildings as a result of the extreme high temperature conditions.
All structures housing safety-related systems were examined for the effect of minimum temperature of -160F for a 24-hour period. All areas of all the buildings in question are capable of being maintained at a temperature of 500F, or greater, under those conditions, except the following:
An area of the Secondary Containment outside the 0
personnel hatch
+34 F Diesel Generator Building, Mechanical Equipment Rooms at Elevation 51'-6" --- -160F Cooling Tower The Secondary Containment Area in question contains no safety-related equipment and, therefore, the < tempe ra ture extremes in this area will have no effect on the safe operation of the station.
The equipment in the Diesel Generator Mechanical Equipment Rooms will start and run satisf actorily under these extreme minimum conditions.
The following considerations were taken into account for the low temperature evaluation of the mechanical draf t cooling tower which serves as backup to the main circulating water tunnel for cooling of the. primary components heat.exchangers and diesel generator heat exchangers:
1.
The tower is only intended to be used as a cooling means for the service water system if a seismic event has occurred which results in a blockage of over 95% of the flow area of the intake tunnel. As stated in FSAR Sections 9.2.1 and 9.2.2, the total flow required for the performance of the heat sink function by the tower is less than 5% of the circulating water flow rate provided during normal full power operation. The likelihood of such extreme blockage occurring in this hard rock tunnel is considered extremely remote.
2.
The five-year on-site and 25-year Pease AFB outdoor temperature data bases reveal that 00F was equalled or exceeded 0.356% of the time on-site and 0.394% of the time at Pease AFB.
The probability of a major seismic event which could render the tunnel incapable of providing sufficient service water flow concurrent with temperatures below the design temperature of 00F is considered extremely low.
Based on the above considerations, the availability of sufficient service water is assured.
Because of the thermal inertia associated with concrete structures and the relatively short duration of time that temperatures would be below -16 F, we do not feel the temperatures of the buildings would fall significantly below the values stated above.
Since the environmental conditions in the areas discussed above are acceptable from the personnel access and operating equipment standpoints, it is concluded that the extreme minimum 100-year return temperature would not be detrimental to plant operation.
Re fe rences 1.
National Severe Storms Forecast Center, Tornado Data, " Tornadoes Within 125 Miles of Seabrook", 1950-1981 (unpublished).
2.
NOAA Technical Report NWS 23, " Meteorological Criteria for Standard Project Hurricane and Probable Maximum Hurricane Windfields, Gulf and East Coasts of the United States", Washington, D.C., September 1979.
3.
Telecon with Ms. Ettinger, Portland NWS, April 21, 1982.
4 NRC Regulatory Guide 1.76, " Design Basis Tornado for Nuclear Power Plants", April 1974
. 5.
Nicodemus, M.
L., and-N.
B. Cuttman, " Probability Estimates of Tcmperature Extremes'for the Contiguous United' States", NUREG/CR-L390, National Climatic Center, Asheville, NC, May 1980.
s.
6.
United Engineers and. Constructors, Inc. Repo rt, " Probability Estimate of-Temperature Extremes for Seabrook New Hampshire", January 1983.
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TABLE 451.11-1 H0rfEST CONTIGUOUS 24 HOURS IN ASSOCIATION WITH THE HOTTEST ONE-HOUR TENFERATURE*
OBSERVED DURING 1957 THROUGH 1961 AT PEASE AFB Year _
Date Hour Temperature (OF) 1964 June 30 He 15 89 16 89 17 89 18 85 19 81 20 80 21 77 i
22 76 23 76 July 1 He 00 74 1
76 2
75 3
75 4
74' 5
73 6
76 7
80 8
88 9
92 10 93 11 96 12 98 13 101*
14 100 800*d g926 - N0(1915 N0050U35 lus 9tstt te. Ct'awu
i TABLE 451.11-2_
Five Coldest and Warmest 14wHottr~ Periods at Seabrook Station _
rm vi-T tt-es= rut 0os rm cussr 24-ma t ='ar=
-4.04 -7.12 -3.30 -2.70 -2.50 hversas ee.e2 es.s?
es.u ea.ts os.st 1M4 1957 1980 1967 1901 Yeee 1973 1977 1944 1974 19 81 Ported East AyA,2 J.d 21 Jul 19 Jul 27 y Aversee erted tedt /,,as.J !Ja_110=c_26 II.k 32 !J"._1 Yeer P
sour me 00 ao 01 01 02 02 03 03 04 74 M
n 04 g
-2
-4 06 82 07 85 06
-5
-2
- 08 90
-4 o7
-7 o8
-7
-4 09 92 og
-7 0
-2 10 97 88 10
-7 1
-2 11 99 90 12
-5
-5*
2 1
12 100 11
-6 13
-4
-4 2
2-13 100 93 91
-4 3
3 14 100 M.
93
-4 3
3 15 98 94 93 14
-4 15
-5 3
2 16-97 94 M
93
-4
-5 2
0 17 92 92 92 91 Ig
-5 18
-7
-7 0
0 18 87 89 89 86 1g
-8
-7
-1
-2 19 84 87 87 85 87 17
-4 20
-10
-7
-1
-2 20 82 85 85 M
84
-7
-2
-5 21 80 83 M
82 82 22
-10
-4
-7 ~.
-3
-7 22 78 82 84 82 80 23
-10
-7
-6
-4
-7 23 77 Oc 82 82 80 21
-10 00
-10
-4
-5
-5
-7 00 80 79 81 82 79 01
-9
.-10
-5
-4
-5 01 77 79 80 80 78 02
-9
-11
-5
-7
-5 02 75 78 79 79 77 03
-10
-13
-5
-4
-5 03 76 n
79 79 75 77 78 79 74 n
n 78 75 og
-9
-14
-5
-4
-4 04.
06 77.
76 78 77 05
-10
-15 4
-4
-4 05
-9 80 78 79 79 06
-10
-15 07
-9 84 80
- 81 80 07
-12
-16 08 08
-10
-14
-7 87 84 82 82 of
-9
-12
-3 91 90 85 85 09 95 92 90 10 to
-7
-8 11 96 94 89
-5 12 93 11 96
-1 13 95 12 0
98 94 13 14 98 1
15 94 14 0
16 93 15
-3 17 90 16
-4 17 18
-4 19 18
-4 19 20
-2 21 20
-2 22 21 22 23 23
[
>1 C8. Gt'auw E926 - H011615 30058635 Aug 2C:C!
600*d e.
.+
TABLE 451.11-3 IIIGH TEMPERATURE EXTRD(E IE CONTROL BUILDING AT 21'-6" MAXIMUM TEMPERAT1JRE (OF)
COMPARTNENT 113.0 Emergency Switchgear Rooms
- Train A or Train 3 113.3.
Rod Drive MG-Set Roome 103.0 Battery Rooms "A," "B," "C"
& "D" 113.5'F Remainder of Switchgear Araa f
I l
l fl*
L.
ose*a C926 - H0!1W15 x0050935 LWO 8Citt C8. Cl*avu
-.