ML20038B431
| ML20038B431 | |
| Person / Time | |
|---|---|
| Site: | Perry  |
| Issue date: | 12/04/1981 |
| From: | Davidson D CLEVELAND ELECTRIC ILLUMINATING CO. |
| To: | Tedesco R Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8112080286 | |
| Download: ML20038B431 (12) | |
Text
a T ii E C L E V E L A N D E L E C T R I C I L L U ld l N AT I N G C O M P A ll Y P o Box 5000 e CLEVELAND. OHlo 44101 e TELEPHONE (216) 622-9800 e ILLUMINATING BLOG e
55 PUBLICSoVARE Dalwyn R. Davidson
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""9 MCE PRESIDENT p-
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g SYSTEM ENGINEERING AND CONSTRUCTION
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-I December 4, 1981 kog
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Mr. Robert L. Tedesco
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U Assistant Director for Licensing
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Division of Licensing bs U. S. Nuclear Regulatory Commission
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Washington, D. C.
20555 Perry Ihclear Power Plant Docket Nos. 50-M 0; 50- M 1 Response to Request for Additional Information -
Accident Evaluation
Dear Mr. Tedesco:
This letter and its attachment is submitted to provide draft responses to the concerns identified in your letter dated October 23, 1981, in regards to Accident Evaluation.
It is our intention to incorporate these responses in a sub-sequent amendment to our Final Safety Analysis Report.
Very Truly Yours, b
Dal
. Davidson Vice President System Engineering and Construction DRD: mlb Attachment cc:
G. Charnoff, Esq.
M. Dean Houston NRC Resident Inspector g
.s Ifl 8112080286 811204 PDR ADOCK 05000440 A
450.07 Do all reactor coolant containing instrument lines and all other (15.6.2) lines exempted from General Design Criterion 55 pass through and terminate only in plant volumes served by engineered safety feature ventilation systems?
Response
PNPP has no instrtment lines connected to the reactor coolant system boundary which penetrate the primary containment. The post-accident sampling lines will penetrate containment, however, will pass through and terminate only in plant volumes which are served by engineered safety feature ventilation systems.
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451.01 a)
Identify the extremes of temperature (maximum and minimum) considered in the design of safety-related structures,
- s. a ms, and components.
b) Provide the basis for the selected values, c)
Compare the selected values with extreme maximum and minimum temperatures obaerved in the region through 1980 (Note:
Table 2.3-4 presents extreme temperatures observed through 06/78) with the values for a 100-year return period (108 F maximum and -32 F minimum) presented in NUREG/CR-1390,
" Probability Estimates of Temperature Extremes for the Contiguous United States." (May 1980)
Response
a.
FSAR Section 3.8.1.3.1.e.2 (Page 3.8-11) provides the range of ambient temperatures used in the design of Category I atructures.
b.
This range is based on the maximum and minimum 7 day mean temperatures for the region.
A comparison of extremes of maximum and minimum temperatures in the c.
region is provided below:
100-year return (1) Cleveland ( } Erie (
Painesville( } Geneva ( }
max 1080F 103 F 94 F 96 F 98 F min -32 F
-19 F
-170F
-15 F
-20 F
(
Values referred to in NUREG/CR-1390
(
No change from Table 2.3-4 of PNPP FSAR Values in Table 2.3-4 of PNPP FSAR revised on basis of Local Climatological Data and Climatological Data from 1978 through 1980 (NOAA)
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451.02 The tornado statistics presented in Section 2.3.1.2.2 are based on a regional data base which ended in 1977.
Identify any i
tornadoes that have occurred in the vicinity of the site since 1977, and provide estimates of the intensity (maximum wind speed) and path area of each.
Based on this additional information, provide a revised estimate of tornado strike probability at the plant site.
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Response
In the period of 1978 through 1980, there were 6 additional tornadoes within a 50-nautical mile radius of the PNPP.
This is based on the most recent tabulation from the National Severe Storms Forecast Center records.
The j
intensity estimates and path areas of each are as follows:
l Intensity F
Maximum 2
Date Time (CST)
Class Wind Speed (mph) Path Area (mi )
]
June 7, 1978 1615 1
73 to 112 0.04 June 7, 1978 1655 2
113 to 157 0.09 1
June 18, 1978 1515 1
73 to 112 0.01 June 15, 1980 1345 0
40 to 72 Missing July 21, 1980 1215 1
73 to 112 Missing August 2, 1980 1630 1
73 to 112 Missing These 6 tornadoes bring the total count to 54 for the 31-year period of January 1950 through December 1980.(1)
This averages out to 1.74 tornadoes per year within the radius. Using the same methodology as in 2
the FSAR, the new average individual tornado path area is a = 0.631 nmi,
5
-4
-1 Thus, the tornado strike probability is estimated at 2.87 x 10 year yielding a recurrence interval of 3,479 years. This estimate is made on the basis of Eq. 2.3-1 in the FSAR with the new annual frequency and new i
average tornado path area.
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(1) National Severe Storms Forecast Center, October 1981:
Tornadoes Within 50 nm of Perry Nuclear Plant, 1950 to 1980. NOAA, NWS, National Severe
]
Storms Forecast Center, Kansas City, Missouri.
451.03 Provide the " Attractive Area" of plant structures used in the determination that the " Containment buildings will average approximately one (lightning) strike every five years.
(FSAR
- p. 2.3-11).
Response
The attractive area of the containment buildings (reactor buildings) as defined by Golde's( } methodology (referred to on p. 2.3-11 of the PNP 2
FSAR), is 0.03 km.
The area was approximated with the length, height, and width dimensions of 42, 35, and 42m, respectively.
This describes the part of the reactor building (above the top of the adjacent auxiliary building) exposed to a potential lightning strike.
Reference 1.
Golde, R. H.:
Protection of Structures Against Lightning.
Proceedings, The Institute of Electrical Engineers, Vol. 15, No. 10, pp 1153-1529; October 1968.
451.04 Annual average precipitation at the Perry site for the three years (5/1/72 - 4/30/74 and 9/1/77-8/31/78)'is considerably less (about 30%) than annual average precipitation for the same three-year period reported at nearby stations such as Erie, PA., Cleveland, OH., Painesville, OH., and Geneva, OH.,.
(See Table 2.3-16) a) Provide a discussion of this apparent anomaly in amount of precipitation observed at the Perry site, and indicate if other parameters (particularly wind direction) measured during the 3-year period could also be anomalous.
b) Provide comparisons of meteorological data (e.g.,
precipitation, wind speed, and wind direction) collected at the Perry site for the period 9/1/78 - 8/31/81 with similar data from nearby stations for the same period.
Response
The response is organized in two parts:
a.
Precipitation b.
Other Parameters (1) Wind Speed (2) Wind Direction (3) Atmospheric Stability a.
Precipitation The tendency for the PNPP to have lower monthly precipitation totals than nearby stations has continued beyond the three FSAR years. The tendency is illustrated in the following table of annual precipitation totals (inches):
451.04 (Pg. 2) Cont'd PNPP Cleveland Painesville 3 FSAR Years (Table 2.3-16) 29.07 41.67 41.90 9/1/78 to 8/31/79 25.54(2) 38.29(5) 31.90( )
9/1/79 to 8/31/80 32.06(3) 36.34(5) 43.61(1) 9/1/80 to 8/31/81 30.05( )
33.38(5)
Not available The four figures of monthly precipitation values illustrate that it is uncommon for the PNPP monthly total to exceed that of Cleveland or Painesville.
Such cases tend to occur in the summer and fall during the part of the year associated with more-frequent and more-scattered shower and thunderstorm activities.
The tendency for PNPP to have lower precipitation totals may be related to the orographic and lake effects (discussed in PNPP FSAR Sections 2.3.1.1.4 and 2.3.1.1.5) and to lake breeze effects (discussed in Sections 2.3.1.1.5 and 2.3.2.3.2).
PNPP's closeness to the lake shore may tend to protect it from lake breeze induced showers, which probably form further inland along the line of convergence (lake breeze front).
In the cold months, the tendency for lower totals is probably attributable in part to evaporation--induced by the precipitation gauge heater--of precipitation before enough accumulates for it to be recorded.
b.
Other Parameters The meteorological data collected from the PNPP site subsequent to the three FSAR years of data have been examined.
The parameters involved relate to the atmospheric dispersion characteristics of the PNPP.
Etcords of wind speed, wind direction, and atmospheric stability continue to offer support of the three FSAR years as being representative (and non-anomalous) of the long term and of the site characteristics.
451.04 (Pg. 3) Cont'd (1)
Wind Speed The annual average wind speeds continue to be in good agreement with long-term averages discussed on p. 2.3-15 of the PNPP FSAR:
PNPP (10m)
Cleveland (6.1m)
Data Period (mph)
(mph) 3 FSAR years (Table 2.3-7) 8.2 10.2 Year 4:
9/1/78-8/31/79 8.9( )
10.5(5)
Year 5:
9/1/79-6/31/80 8.1(3) 10.8(5)
Year 6:
9/1/80-8/31/81 8.3(4) 11.0(5)
(2)
Wind Direction The peak 10-m wind direction at the PNPP has continued to occur in the southwest quadrant, as was reported on p. 2.3-15 in the PNPP FSAR.
The annual frequency distributions of wind direction for the period 9/1/78 to 8/31/81 have been similar to those reported in the PNPP FSAR.
(3)
Atmospheric Stability The stability distribution (percent frequency) for subsequent years continue to be reasonably similar to those discussed on p. 2.3-19 of the PNPP FSAR for the 3 FSAR years.
Stability Class Based on Delta T (60-10m)
Data Period A
B fi f[
E F,
f[
3 FSAR Years (Table 2.3-18) 4.44 3.47 4.38 47.64 24.91 7.10 8.06 Year 4(2) 9/1/78-8/31/79 5.14 1.75 2.04 47.67 28.26 7.41 7.72 Year 5(3) 9/1/79-8/31/80 0.66 1.44 3.76 53.59 25.63 6.87 8.05 Year 6('}
9/1/80-8/31/81 3/88 4.50 5.15 46.78 24.12 7.15 8.42
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451.04 (Pg. 4) Cont'd References (1) NOAA, 1978 to 1981:
Climatological Data, Painesville, Ohio, Annual and Monthly Summaries. National Oceanic and Atmospheric Administration, EDS, NCC, Asheville, North Carolina.
(
- Mitchell, A..E., Jr. and R. W.' Brode, May 1980: Annual Report of the Meteorological Program at the Perry Nuclear Power Plant, September 1, 1978 to August 31, 1979.
NUS-3485, NUS Corporation, Rockville, Maryland.
( ) Mitchell, A.
E., Jr. and R. W. Brode, February 1981: Fifth Annual Report of the Meteorological Program at the Perry Nuclear Power Plant, September 1, 1979 to August 31, 1980.
NUS-3706, NUS Corporation, Rockville, Maryland.
( } Mazaika, M. D. and A. E. Mitchell, Jr., in preparation:
Sixth Annual Report of the Meteorological Progran at the Perry Nuclear Plant, September 1, 1980 to August 31, 1981. NUS-3927, NUS Corporation, Rockville, Maryland.
'(5) NOAA, 1978 to 1981:
Local Climatological Data, Cleveland, Ohio, Annual and Monthly Summaries.
National Oceanic and Atmospheric Administration, EDS, NCC, Asheville, North Carolina.
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451.05 Provide a description of the digital recording system for meteorological data which was installed in March 1978, and provide an assessment of the accuracy of this system for time-averaged values of meteorological parameters.
Response
The digital monitored data processing system (MDPS) is co-located with the analog equipment in the shelter at the base of the meteorological tower.
In November 1978, the digital system became the primary data source.
The basic MDPS is a DEC LSI 11 minicomputer with an ADV ll-A analog to digital converter.
The MDPS uses sub-second sampling rates of instantaneous values to develop 15-minute values.
The 15-minute values are subsequently combined to yield hourly values.
The MDPS can provide a record of the processed data in the shelter, directly to a remote onsite location, and via telecommunication to a re=ote offsite location.
The time-averaged accuracy of the digital system for each parameter is determined by the method described on p. 2.3-27 of the PNPP FSAR. With a 0.10 percent-of-full-scale accuracy associated with the MDPS (of the A-D converter) and a sampling rate of approximately ten times per second, the time-averaged overall digital system accuracy is less than:
0.02 for wind direction, 0.01 mph for wind speed, 0.01C for temperature, 0.01C for temperature difference, 0.01C for dew point, and 0.01 in, of Hg for station pressure.
(Note:
Optionally,.the first paragraph could be inserted to p. 2.3-26 and the second paragraph to p. 2.3-27, respectively, in Section 2.3.3.1 of PNPP FSAR).
451.06 Provide a complete description of the meteorological measurements program (iucluding control room display) to be available during plant operation, considering for emergency planning, described in NUREG-0654 and Regulatory Guide 1.97.
Also indicate how site-specific meteorological characteristics such as the lake breeze circulation described in Section 2.3.2.3.2 will be considered in emergency planning.
Response
Concept development for the meteorological measurements program of the operational PNPP (including emergency support) is being completed.
The program will involve an extension of the digital system (described in Section 2.3.3.1 and Q451.05).
The measurements and modeling will be responsive to NUREG-0654 and Regulatory Guide 1.97.
Consideration of the lake breeze circulation at the site will be included. A complete response to the question is tentatively planned for February 1982.
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