ML20076J768
| ML20076J768 | |
| Person / Time | |
|---|---|
| Site: | Seabrook  |
| Issue date: | 06/24/1983 |
| From: | Devincentis J PUBLIC SERVICE CO. OF NEW HAMPSHIRE, YANKEE ATOMIC ELECTRIC CO. |
| To: | Knighton G Office of Nuclear Reactor Regulation |
| References | |
| SBN-524, NUDOCS 8307060129 | |
| Download: ML20076J768 (12) | |
Text
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'm 1671 Worcemw Rood Pub 5c Service of New Hampshire M"'***d "ON (617) - 872 - 8100 June 24, 1983 S BN- 524 T.F. B7.1.2 United States Nuclear Regulatory Commission Washington, D. C. 20555 Attention: Mr. George W. Knighton, Chief Licensing Branch No. 3 Division of Licensing Re fe re nc es : (a) Construction Permits CPPR-135 and CPPR-136, Docket Nos. 50-443 and 50-444 (b) PSNil Letter, dated March 29, 1983, " Response to SER Outstanding Issue #1 (SER Section 2.3.1, Meteorological and Effluent Treatment Systems Branch)," J. DeVincentis to C. W. Knighton (c) PSNil Letter, dated April 20, 1983, " Supplemental Response to SER Outstanding Issue #1 (SER Section 2.3.1, Meteorological and Ef fluent Treatment Systems Branch),"
J. DeVincentis to G. W. Knighton
Subject:
Pevised Response to SER Outstanding Issue #1 (SER Section 2.3.1, Meteorological and Ef fluent Treatment Systems Branch)
Dear Sir:
We have enclosed a revised version of the response to SER Outstanding Issue #1 which was forwarded in Reference (b). The enclosed revised response re flects discussions with the Staf f reviewer (J. Fairobent) at a meeting conducted on May 18, 1983. Revisions are indicated by bars in the right margin.
The enclosed response will be incorporated in OL Application Amendment 49.
Ve ry truly yours, YANKEE ATOMIC ELECTRIC COMPANY B307060129 830624 PDR ADOCK 05000443 E PDR
- - Qh John DeVincentis Project Manager ALL/pf Enc losure \
cc: Atomic Safety and Licensing Board Service List 1000 Elm St.. P.O. Box 330, Manchester, NH 03105 Telephone (603) 669-4000 . TWX 7102207595 !
Rep. Beverly Hollingworth Ms. Olive L. Tash Coastal Chamber of Commerce Designated Representative of 209 Winnacunnet Road the Town of Brentwood Hampton, NH 03842 R.F.D. 1, Dalton Road Brentwood, NH 03833 William S. Jordan, III, Esquire Harmon & Weiss Edward F. Meany 1725 I Street, N.W. Designated Representative of Suite 506 the Town of Rye Washington, DC 20006 155 Washington Road Rye, NH 03870 Roy P. Lessy, Jr., Esquire Office of the Executive Legal Director Calvin A. Canney U.S. Nuclear Regulatory Commission City Manager Washington, DC 20555 City Hall 126 Daniel Street Robert A. Backus, Esquire Portsmouth, NH 03801 116 Lowell Street P.O. Box 516 Dana Bisbee, Esquire Manchester, NH 03105 Assistant Attorney General Office of the Attorney General Philip Ahrens, Esquire 208 State House Annex Assistant Attorney General Concord, NH 03842 Department of the Attorney General Augusta, ME 04333 Anne Verge, Chairperson Board of Selectmen Mr. John B. Tanzer Town Hall Designated Representative of South Hampton, NH 03842 3
the Town of Hampton 5 Morningside Drive Patrick J. McKeon Hampton, NH 03842 Selectmen's Office
, 10 Central Road Roberta C. Pevear Rye, NH 03870 Designated Representative of the Town of Hampton Falls Ruthanne G. Miller, Esquire Drinkwater Road Law Clerk to the Board Hampton Falls, NH 03844 Atomic Safety and Licensing Board U.S. Nuclear Regulatory Commission Mrs. Sandra Cavutis Washington, D.C. 20555 Designated Representative of the Town of Kensington Dr. Maury Tye, President RFD 1 Sun Valley Association East Kingston, NH 03827 209 Summer Street Haverhill, MA 01830 Edward J. McDermott, Esquire Sanders and McDermott Mr. Angie Machiros Professional Association Chairman of the Board of Selectmen I
408 Lafayette Road Town of Newbury Hampton, NH 03842 Newbury, MA 01950 Jo Ann Shotwell, Esquire
- Assistant Attorney General
- . Environmental Protection Bureau Department of the Attorney General one.Ashburton Place, 19th Floor Boston, MA 02108 l
)
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 I (through January 1982 for extrece 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 NUREG/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.
4 Extreme Outdoor Temperatures Maximum 880F f- Minimum 0 F i 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 3.11(B)-1 (Service Environment
, Chart) under the outdoor conditions specified above. j
- - 1 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:
i Severe Environmental Load:
l A wind speed of 110 mph at 30 feet above ground for a 100-year: return.
to
d l'db Extreme Environmental Load:
A total maximum tornado wind velocity (translational plus rotational of 360 mph). .
Seismic Category I structures and certain non-Seismic Category I structures were designed for the following atmospheric pressure change accompanying the design basis tornado:
1 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 Eandbook of -Fundamentals",
i 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, dev formation and precipitation which are frequently 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 1 pressures for Seismic Category I' structures and certain I
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 eite 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 1040F (Boston, July 1911) and -390F (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 i- 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 (Reference 1) indicates that the closest initial tornado-touchdown point recorded was approximately 2' miles from the i site on July 1,~1968.- This tornado was rated 1 on the-
- (5 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 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).
According to NUREG/CR-1390 (Reference 5), the 100-year return period maximum and minimum temperatures for the Seabrook site are approximately 1060F and -320F, respectively. These extreme temperatures were obtained by the interpolation between isotherms shown on the maps of 100 year maximum and minimum temperatures contained in NUREG/CR-1390 The data base used to develop these maps does not include, however, temperature data from any reporting stations near the Seabrook site and also shows a strong influence of inland etations on the isotherm maps of 100 year maximum and minimum temperatures. Thus, NUREG/CR-1390 does not, in our opinion, adequately account for the modification of extreme temperatures due to the proximity of Seabrook to the Atlantic Ocean.
Our analysis (Reference 6) of extreme temperature data 4- collected at nearby weather stations (Portsmouth, NH (Pease AFB)), climatological stations (Rockport, MA, Sanford, 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, respectively. (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 greater than one-hour, extreme temperatures for 2, 4, 8, 12, and 24-hour averaging periods were also determined. The values are listed below:
100-Yea r Return Period Temperature (OF) i Averaging Period Maximum Minimum i
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 1010F 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 of 1957 through 1981 are presented by Table 451.11-2.
- e. Calculations show that resulting maximum ambient temperatures r j experienced by equipment, located in ventilated compartments of concrete structures are functions not only of the temperature extremes, but also are functions of the diurnal i
. variations in the outside temperature and 'the thermal inertia i 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
- is gained by accounting for this thermal inertia can be determined by calculating the room temperature as_a function of time'of day.
From Table 451.11-2, which shows maximum temperatures of 1000F on August 3, 1975, the hottest 24-hour average external temperature was determined as'86.60F. Since our
. __ a ~ ._ , ~= u .. - u , - .- ,
f analysis of temperature extremes predicts a 100-year return maximum temperature of 1020F, the hourly temperature progression data for this day was thus adjusted upward by 2 F, 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 from 1180F to 113.50F, and in the Battery Rooms from 1090F to 1030F, 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 Pease AFB meteorological data (Reference 6), the outdoor temperature exceeding the extreme design temperature of 880F' occurs during a small fraction (0.25%) of the plant life. Moreover, 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 0F as long as the peak temperature of a hypothetical day does not exceed 910F. The fraction of the plant life when the
- temperature exceeds 910F is less-than 0.105%.
Elevated ambient temperatures may affect equipment life.
! However, to do so'the temperatures must be much higher than the design ambient temperature of the equipment and must be
- sustained for a long period of time.
Since internally generated heat is a function of the square of the current (P = 12 R) the loading of the equipment has a j great effect on the internal temperatures.
We have determined that there will be no significant.
- degradation of equipment within the buildings as a result of j the 100-year return maximum temperature for the following reasons
l o The maximum ambient temperature exceeds the design ambient by less than 100F,
-o The duration of these elevated temperatures as shown in response d is short and occurs infrequently throughout the life of the station.
f l o. The loading of our equipment is expected to be
.significantly lower than design maximum.
w $ - ,* - -ws- 7x- s up e e e e
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 personnel hatch 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 temperature 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 satisfactorily 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 in 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 ock 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.
(b{
l Because of the thermal inertia associated with concrete
- k. structures and the relatively short duration of time that temperatures would be below -160F, we do not feel the temperatures of the buildings would fall significantly below the values stated above and, therefore, the equipment within the buildings would be unaffected by the 100-year return minimum temperatures.
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 100-year return temperatures would not be detrimental to l plant operation. I References
- 1. National Severe Storms Forecast Center, Tornado Data, " Tornadoes Within 125 Miles of Seabrook", 1950-1981 (unpublished).
- 2. NOAA Technical Report WWS 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, Partland 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. Guttman, " Probability Estimates of Temperature Extremes for the Contiguous United States", NUREG/CR-1390, National Climatic Center, Asheville, NC, May 1980.
- 6. United Engineers and Constructors, Inc. Report, " Probability Estimate of Temperature Extremes for Seabrook New Hampshire", January 1983.
g-I .
-~ ~ '
j TABLE 451.11-1 f l
l i
I e ENTEST CONTICUOUS 24 HOURS IN ASSOCIATION WITH t
THE HOTTEST ONE-MOUR TElfERATURE*
OBSERVED DURING 1957 TEROUGE 1981 AT PEASE AFB Mour Temperature (*F) g Date June 30 Er 15 89 1964 89 16 17 89 18 85 19 81 20 80 21 77 22 76 23 76 July 1 Br 00 74 1 76 2 75 3 75 4 74 5 73
- I 76 6
7 80 8 88 9 92 10 93 96 11 1
' 12 98 13 101*
14 100 C926 - HOI 1W15 M0088W35 AW9 9tsti C8. St*sWW 888'd _ _ - __ _ , _ ..
., . *< > *, g
/ !
- TAnfR 451.11-2_
Five Coldest and Warmest j
- 14'tiour Periods at Seabrook Station _
i ytyg ui ===T 24 ==vu FEcons
- aw arar 34 m yesemme e6.ti, es.91 e4.42 e3.87 83.13 frys Amorees 1964 1974 1941
-4.94 -7.12 -S.30 -2.70 -3.30 Year 1973 1977 Avereen Forted Gada fag,J h L31 h Lil h L U, h L 1 Year 1M8 1957 1900 1M7 1981 rted tada 13,1 Jgt111e,s.l,f hk M _Pe newt ne=r
'00 00 01 .
01
- 02 Ot 03 04 74 03 04 M . n .
-4 08 at M -t 85 06 -1 07
-5 4' 06 90 OF -7 92 us -4 03
-7 10 97 88 Og 0 -t
-7 11 99 to -7 1 -2 100 90 11 -4 2 1 12 93 91 4 -5* 13 100 93 11 -4 2 2- 100 M,
13 4 3 14 M 93
-4 -4 3 15 98 93 14 -4 3 3 97 M M 15 -4 3 2 16 92 91
-5 5
- 17 92 92 15 2 0 86 4 -5 18 87 8B SB 86 87 17 -7 0 0 M 87 87 14 -7 -1 -2 19 85 M 86 7
to 82 85 at
" 19 -4
-7 -1 -t 80 83 M st 30 -10 -5 21 M 32 80
-10 -7 -t 22 M st 42 to II
-4 -7 -3 -7 77 m 82 at -10 -4 -7 23 81 82 79
-7 4 00 79 23 -10
-4 -5 -6 -7 00 77 79 to e M 00 -10 -4 -5 01 79 79 77
-9 -10 -5 et 75 78 79 75 01
-11 -5 -7 -5 M n 79 02 -9 -4 5 03 N 79 74
-10 -13 -5 04. 77 M 75 03 -5 -8 4 77 77 04 -9 -14 -4 06 76 FS TF
-15 4 -4 77 as -10 -9 06 80 M 79 79
-10 -15 07
- 81 80 Os
-12 -16 at 08 M 80 82
. 07 -7 37 M 82 10 -14 Og 90 85 as 08
-4 -12 -3 to 91 to 00 95 92 10 -7 4 11 M 89
-5 12 M 93 11 96 ,
-1 13 95 '
12 98 0 14 M ' 13 98 14 1 15 94 0 le 93 l 15 14
-3 17 90
-4 18 .
17 4 19 18
-4 to 19 t 21 to -2 21 22 El 23 l 23
( [$ e,
!1 l
E926 - NOI1W15 20088W35 AW9 tritt te. Ct'aww 600
- al
l[ ' TABLE 451.11-3 UIGH TEMPERATURE EXTREME IN l
. ColfrROL BUILDING AT 21' -6" i MAXIMUM TEMPERATURE (OF)_
!- CONFARTMENT Emergency Switchgear Rooms 113.0
- Train A or Train B
- 113.3 .
Rod Drive HG-Set Rooms 103.0 Battery Rooma "A," "B." "C" Kr "D" Remainder of Switchgear Area 113.5'F ,i J 4 l i - t i i l l l l I
)
O Ll L-ste's 2926 - Nortwis xoomewis 1 e scics ca. si avu
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