ML20076H036

Forwards Draft Responses & Draft FSAR Page Changes in Response to Meteorology & Effluent Treatment Branch Draft SER Items 2,4,5 & Request for Addl Info RAI 451.14

ML20076H036
Person / Time
Site:	Limerick
Issue date:	06/13/1983
From:	Bradley E PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	Schwencer A Office of Nuclear Reactor Regulation
References
NUDOCS 8306160371
Download: ML20076H036 (43)

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GENERAL $ ELECTRIC oa MEDIUM VOLTAGE SWITCHGEAR BUSINESS SECTION GENERAL ELECTRIC COMPANY

• P.O. BOX 488

• BURUNGTON, K7#A 52601 * (319) 753-8400

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Mr. Richard DeYoung, Director Office of Inspection & Enforcement U.S. Nuclear Regulatory Commission Washington, D.C.

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Dear Mr. DeYoung:

Following is our status in the investigation of the 60 amp fuse holder (Dwg. 06730515-422-01) ;;roblem as reported to you in my letter of May 10, 1983.

The technical investigation has involved the following contributors:

e General Electric - Burlingtcn, IA (final assembly location) e ILSCO - Cincinnati, OH (fuse clip vendor to GE) e Metcut Research Associates, Inc. - Cincinnati, OH (metallurgical lab consultant to ILSCO)

American Spring & Wire - Chicago, IL (major current source of the e

actual spring to ILSC0; although not the historical exclusive source) e General Electric Co. - Philadelphia, PA (location of a metallur-gical lab co'nsultant to Burlington GE) lsCN 8306160516 830600 f

PDR PT21 EMVGENE 83-894-000 PDR

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Page Two 6/8/83 l

l As background, ILSCO is a major industry supplier of fuse clips. The general design has been stable and their quantities built utilizing this j

spring have been quite high, i.e.:

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l PRODUCTION l

YEAR

• (1)

• • (2) 1976 640,000 1977 676,000 1978 972,000 1979 408,000 1980 414,000 133,011 1981 466,000 180,518 1982 179,000 53,440 1983 58,000 9,722 (thru June)

• Yearly quantity of exact spring design used in two similar fuse clip l

assemblies.

• • Yearly quantity of exact fuse clip / spring used in our 60 amp fuse holder.

F:USE CLIP WIRE REINFORCED TYPE M P

l These clips are made from electrolytic copper sheet. A l

permanent band of tough spring steel wire encircles the l

clip insuring tighter grip and positive contact with either l

l knife or ferrute type fuses. Each reinforcing spring is plated and heat treated to prevent hydrogen embrittlement.

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e Mr.-Richard DeYoung Page Three 6/8/83 The clip is made from soft copper CDA 110 (hot roller copper sheet),

and the spring is fabricated from.062 square spring wire, plated to resist corrosion.

According to ILSCO, the design of the spring has been stable for many years as the drawing was issued in 1966 and the only revision was made in 1978, a tolerance change on tne "as bent" opening. No field problems with this spring have been reported except recently by General Electric Co.

The springs are made in batches of about 100K and American Spring and Wire has been a major, though not exclusive, supplier.

The following is to record the fuse clips sent to GE for, assembly:

DATE RECEIVED QUANTITY April 5, 1982 10,530

" October 26, 1981 9,970

'dme 1,1981 10,270 October ?, 1980 10,000 May 13, 1980 6,000 y

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Page Four 6/8/83 GE has reports of the followi.ng spring failures.

None of these are from nuclear. sites and none actually opened their circuit.

EQUIPMENT QTY FUSE MFD. DATES CLIPS BRKN COMMENT Jan. '82 2

Report by P. Badey Oct. '82 Unknown Field requested 225 (several failures)

Oct. '82 2

100 clips checked Nov. '82 10 Field checked all fuses Nov. '82 19 64' clips checked Apr. '83 5

108 clips checked Apr. '83 1

120clipschec'kel Itgas agreed to focus an intense metallurgical effort to define the spring fa r mode and possible root cause. All failed parts were divided between the rftetallurgists at Metcut and General Electric, Philadelphia. A series of telephone conferences were held to integrate individual findings.

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Laboratory examihation of failed fuse clip springs showed:

The failure ap s to be a two stage failure (as examined with a scanningelectgn~ microscope):

,b Stage 1: The rittle fracture of surface could be initiated by

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'O' Page Five 6/8/83 Stage 2: The ductile fracture to failure.

2)

Under microscopic examination, at 15 to 70 magnifications, no other cracks were found in failed spring sections.

3)

The hardness of spring wire was found to be approximately Rockwell C equivalent 47 to 53.

4)

Although the current and major spring vendor, American Spring & Wire reports to have used only hard drawn spring wire, all failures examined have a tempered martensitic sized structure typical of oil tempered spring wire.

Examination of other new springs sent in by ILSCO as well as some springs identified as being from American Spring & Wire shipments of Oct., '81, showed a hard drawn wire struc-ture.

5)h Both cadmium and zinc plating have been found on springs.

This h.y Ttes to failed parts as well as other springs submitted for analy-sis.

Either coating is acceptable.

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Metallograph[c examination was made of several springs subm'itted t

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ailures. One(of these springs showed cracks on the inside radius of the sharp en'd'as well as at the site of those failures. This Iv~' -

is very important in that it confirms a failure mode which is as p

follows:

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Sp:ings may not have,been properly stressed relieved after forming e

and bafore plating and/or parts were not. properly relieved for

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e possible hydrogen, embrittlement after cleaning and plating.

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. A result of this' would be that fine.e'frface cracks could form in s

highly stressed sections due to hydrogen cbsorption whichlin turn could cause conglete. failure when part is stressed.

7)

All failures examined to date have been oil tempered spring wire.f This wire would probably be more sensitive to hydrogen cracking than hard drawn wire.

8)

Since failures initiated at surface cracks, it wo.uld be expec ed J.

that failures would occur in a relatively short time after stress-y

• 4 ing, such as insertion of the fuse.

If part has not failed after O a: few week's time, it could be expected that no cracks were present Tahdifaildr~eorobabilitywou1dbeminimal'.

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Since' the.' springs see very little, if any, flexing during it's life-time, any'-) mall effects of improper processing on fatiguq life:

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t Afgr.thislaboe3!w3 aort, ILSCO determines that another vendor for this Y

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s spring had been'tried in 1980. He had shipped a total of about 253,800 springs.

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~ America 1, Spring & Wire reported they had not used oil tempered wire due to it's QG 1

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' increased tendency to c' rack'.' We have not been able telconfirm the typeLof wi e f

used by the secondisource-but we suspect it is at the more failure seMtive 2

oil tempered type'.

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ANALYSIS OF FINDINGS:

1)

All reported and studied failures are springs with a martensitic, oil tempered micro structure.

2)

The current sole suplier of springs since 1980 does not use this type of wire and seems to have good processes for a quality product.

3)

It is likely that some of the 1980 shipments to ILSCO from their temporary second source contained oil tempered wire with questionable quality control.

4)

If these springs are going to crack, it should happen quickly after insertion of a fuse.

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ugd5 INTERNAL ACTION:

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we 6 sed test and follow-up inspection"prio to instdll'dfion of any equipment.c We feel this action assures a quality product. g %

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.j s.bd2).3 rings which gre~ questionable are being discarded by ILSCO befpe]/,

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'O Page Eight wdv 6/8/83 FIELD CORRECTIVE ACTION:

As we stated in our letter of May 10, there is only a slight chance, if a clip spring breaks, that it will open the trip circuit by a fuse blc'.i:ut r ics: of contact prassure. We do believe, however, that a single check of these springs should be added to the maintenance check list for the next outage. This recommendation covers nuclear equipment manufactured between January of 1980 and May of 1983.

We will identify all applicable equipment shipped in the troubled period and contact the specific customers affected by Service Advice Letter e

this recommsndation.

If clips are intact, no further action will be h,jrecommended.

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We expe E service advice to be issued withi!n thirty dayi. 3 A

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cc: Judge Lawrence Brenner (w/o enclosure)

Judge Richard F. Cole (w/o enclosure)

Judge Peter A. Morris (w/o enclosure)

Troy B. Conner, Jr., Esq.

(w/o enclosure)

Ann P. Hodgdon (w/o enclosure)

Mr. Frank R. Romano (w/o enclosure)

Mr. Robert L. Anthony (w/o enclosure)

Mr. Marvin I. Lewis (w/o enclosure)

Judith A. Dorsey, Esq.

(w/o enclosure)

Charles W. Elliott, Esq.

(w/o enclosure)

Jacqueline I. Ruttenberg (w/o enclosure)

Thomas Y. Au, Esq.

(w/o enclosure)

Mr. Thomas Gerusky (w/o enclosure)

Director, Pennsylvania Emergency Management Agency (w/o enclosure)

Mr. Steven P. Hershey (w/o enclosure)

Donald S. Bronstein, Esq.

(w/o enclosure)

Mr. Joseph H. White, III (w/o enclosure)

David Wersan, Esq.

(w/o enclosure)

Robert J. Sugarman, Esq.

(w/o enclosure)

Martha W. Bush, Esq.

(w/o enclosure)

Atomic Safety and Licensing Appeal Board (w/o enclosure)

Atomic Safety and Licensing Board Panel (w/o enclosure)

Docket and Service Section (w/o enclosure)

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DSER, Meteorological Section, Question 2 QUESTION E450.5 The staff intends to use the five year (1972 - 1976) period of meteorological data records in the PRA.

In Section 2.8.2.1.4 of the FSAR and EPOL monthly and annual precipitation totals at Limerick for the five year period are cmpared to Philadelphia and Allentown for the same five year period. The cmparison shows that at least 20% more precipitation was neasured at Lunerick than at either of the other locations. Prcvide an analysis and discussion of the causes of these differences.

RESPCNSES The precipitation records of the Ianerick, Philadelphia, and Allentown stations have been reviewed, and it would appear that Limerick often has significantly nore precipitation than the other two locations. This is probably associated with Lirerick's position on slightly higher ground just inland of the extremely flat coastal plain, and that a number of convective storms have affected Limerick nore severely than either Allentown or Philadelphia. Precipitation amounts often vary substantially over small distances, especially during the sunmer.

Precipitation is also known to be quite sensitive to the topography of a region.

Examination of the monthly records for each of the five years, 1972 through 1976, shown in Tables E450.5-1 through E450.5-5, indicates that the excessive precipitation at Lunerick was generally associated with particular storms, and that the remainder of the monthly records are fairly similar at each of the three measuring sites.

As precipitation is influenced by elevation, it should be noted that Limerick precipitation instrumentation is at elevation 255 ft. MSL, while the Philadelphia NWS gage is at 64 ft. MSL and the Allentown gage is at 391 ft. MSL. For the years 1974-1976, total precipitation at Limerick is within 3% of that received at Allentown on an annual basis.

There is one procedural technique that tended to augment the Linerick precipitation in Tables 2.3.3-66 and 2.3.3-67.

To try to take reasonable account of the influence of missing data at Limerick, the total amount of neasured precipitation during the five-year period was divided by the actual number of hours of observation to obtain a nean hourly precipitation rate. This rate was then multiplied by the total number of hours in the five-year period. Therefore, the assumption was made that the missing hours were as likely to have precipitation at the typical rate as any of the other hours. This adjustment, however, could have accounted for no more than approximately a 10 percent discrepancy.

The data recovery for the Limerick precipitation instrumentation on an annual basis is shown in Table E450.5-6.

This instrumentation is calibrated and maintained as described in FSAR Section 2.3.3.3.

This includes weekly inspection. Cmponent checks and adjustnents are made as required. Calibration is performed at least semi-annually in accordance with Reg. Guide 1.23.

The instrument is recalibrated inrediately after any maintenance work is performed which would affect its accuracy.

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'[h LGS EROL TABLE E450.5-1 REGIONAL PRECIPITATIO'N COMPARISONca)<a)

(inches of water) 1972 Limerick Philadelphia Allentown

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Jan 1.93 2.34 2.79 Feb 4.39 5.09 4.05 Mar 4.12 2.69 3.37 Apr 4.61 4.08 2.78 May 7.63 4.11 6.20 Jun 12.401 5.79 8.58 7.

l-Jul 3.09 2.62 5.85 Aug 0.83 3.76 2.26 Sep 1.54 1.12 1.27

,Oct 3.97 3.77 3.59 Nov 14.23:

9.06 9.69 Dec 6.61 5.20 5.42 J

Total 65.35 49.63 55.85 (1) Heavy rains fell across the state due to tropical storm Agnes.

Some of the heaviest rain fell in Schuylkill County with up to 15 inches of rain reported in certain

-areas.

(a) Large precipitation totals in November were due to a series of weather systems dropping heavy rains through-out Eastern Pennsylvania, cawam

lk LGS EROL TABLE E450.5-2 REGIONAL PRECIPITATION COMPARISON (2)(2)

(inches of water) 1973 Limerick Philadelphia Allentown Jan 5.50 3.93 3.58 Feb 3.38 2.96 2.65 Mar 4.03 3.52 2.80 Apr 8.74 6.68 5.94 May 6.30 4.14 5.51 Jun 9.862 7.88 5.36 Jul 1.49 2.39 2.16 Aug 3.46 2.03 2.36 Sep 6.05 3.39 6.18

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' Oct-2.79 2.16_

2.07 Nov 0.39 0.64 1.67 Dec 10.102 6.34 7.89 l

' Total 62.09 46.06 48.17 l

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(1) Heavy thunderstorms caused locally heavy rainfall amounts.

(2) Two heavy snowstorms affected the area with snowfall totals that varied substantially with location.

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LGS EROL TABLE E450.5-3 REGIONAL PRECIPITATION COMPARISON (1)(2)

(inches of water) 1974 Limerick Philadelphia Allentown Jan 2.46 2.95 8.66 Feb 1.47-2.14 1.60 Mar 6.35 4.91 5.38 Apr 4.97 2.77 3.98 May 4.74 3.21 3.85 Jun 5.08 4.43 4.31 Jul 1.93 2.08 1.40 Aug 4.30 3.83 9.422 Sep 6.91 4.68 6.67

'Oct 2.51 1.93 1.58 Nov 1.91 0.81 1.82 Dec 6.992 4.04 4.52 Total 49.62 37.78 48.19 (2) Heavy thunderstorms caused locally heavy rainfall amounts.

Allentown received close to 3 inches of rain in one of these thunderstorms.

(2) An intense storm off the middle Atlantic Coast resulted in heavy snow and/or rain across eastern Pennsylvania.

LGS EROL TABLE E450.5-4 REGIONAL PRECIPITATION COMPARISON (s>(2)

(inches of water) 1975 Limerick Philadelphia Allentown Jan 6.11 4.00 5.17 Feb 3.96 2.91 3.57 Mar 6.39 4.68 3.49 Apr 4.28 2.97 3.50 May 5.55 4.99 4.25

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Jun 7.911 7.57 5.09 Jul 7.662 6.32 7.71 Aug 2.06-2.21 4.23 Sep 6.62 7.21 7.60 Oct 3.11 3.24 4.64 Nov 1.64 3.14 3.37 Dec 2.14 2.89 2.72 Total 57.43 52.13 55.54 (1) Heavy rains caused by scattered thunderstorms.

(2) Large amounts of rain fell across eastern Pennsylvania due to a stationary front oriented north to south.

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LGS EROL TABLE E450.5-5

, REGIONAL PRECIPITATION COMPARISON (1)(2)

(inches of water) 1976 Limerick Philadelphia Allentown Jan 2.09 4.50 5.03 Feb 2.14 1.66 2.80 Mar 2.56 2.38 2.64 Apr 3.15 2.06 2.16 May 4.13 4.35 3.12

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Jun 2.88 3.42 3.57 Jul 1.99 4.04 2.11 Aug 6.291 2.17 5.09 Sep 3.97 2.44 4.60

'Oct 6.532 4.30 5.70 Nov 0.76 0.32 0.68 Dec 2.88 1.63 2.40 Total 39.37 33.27 39.90 (1) Heavy rains were caused by Hurricane Belle traveling north just off the New Jersey Coast.

(2) An Atlantic Coast storm traveling northward caused heavy rains and flooding in eastern Pennsylvania.

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DRAFT LCS EROL TABLE E450.5-6 PRECIPITATION INSTRUMENTATION DATA RECOVERY

~1972 99,9g 1973 95.8%

1974 93.6%

1975 g1,gg 1976 88.5%

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_k DSER, Meteorological Section, Question 4 Starting Threshold of Anemometers (2.3.3)

The applicant claims that the entire onsite meteorological measurements system complies with the accuracy specification presented in Regulatory Guide 1.23, "Onsite Meteorological Programs." However,'the staff-is

- concerned about the starting threshold of the anemometers and the char-acterization of the distribution-of low wind speeds..The anemometers

-installed on Tower No. I have starting speeds of 0.8 m/sec (1.8 mph) compared with-the starting speed of 0.45 m/sec (1.0 mph) recommended in Regulatory Guide 1.23.

Almost 18% of the wind speeds at Limerick are

.below 0.8 m/sec, and, therefore, classified as calm. Because the actual-

- wind speed and direction for calm conditions are unknown, wind speed and direction must be inferred when used in assessments of atmospheric dispersion characteristics. The applicant argues that the stopping speed of the anemometer (about 0.3 m/sec) permits determination of an average wind speed less than 0.45 m/sec.

Because the existing anemometers will not be capable of indicating airflow conditions about 20% of the time, the staff takes the position that a more sensitive anemometer should be installed at the c l m level o

of Tower No. I for use during plant operation.

RESPONSE

The Meteorological Measurement System is being upgraded to comply with

- Regulatory Guide 1.23,. Proposed Rev. 1.

The starting speed of all required wind instruments will meet the 1.0 mph starting speed requirement.

CJO/dg/QU/1

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5, DSER, Meteorologic?.1 SEction, Question 5 Meteorological Measurements During Plant Operation (2.3.3)

The meteorological measurements program during plant operation is planned (see response to question 451.10) to include Tower No. 1, a backup tower located about 120 m away, and the Satellite tower.

It is proposed that existing measurements and instrumentation will continue during the operational program, with the exception of a change from measurement of relative humidity to a measurement of dew point temperature as part of

" Weather Station No. 1."

Meteorological information is planned to be displayed on strip charts in the control room.

All parameters measured at the various meteorological towers included as part of the operational program are planned to be available on strip charts in the control room.

Meteorological data will also be included as part of the Radiation and Meteorological Monitoring System (RMMS) in the Technical Support Center (TSC). Data from this system will be displayed on a CRT in the control room and Emergency Operations Facility (EOF).

The operational meteorological program described above appears to meet a portion of the criteria for upgraded meteorological measurements as part of the emergency response capability.

However, the applicant will be required to completely upgrade the operational meteorological measure-ments program to meet the criteria in NUREG-0654, Appendix 2, " Criteria for Preparation and Evaluation of Radiological Emergency Response Plans and Preparedness in Support of Nuclear Power Plants." The upgrades must be in accordance with the schedule of NUREG-0737, III.A.2, " Clarification of TMI Action Plan Requirements," and its supplement.

The incorporation of current meteorological information into a real-time atmospheric dispersion model for dose assessments will also be considered as part of the upgraded capability.

In addition to the issues discussed above, the staff has identified the following items relevant to the meteorological measurements review.

1.

A description of the instrumentation proposed for the backup meteorological measurements program is requested.

2.

The staff is continuing its review of the details of the display of the meteorological information in the control room, TSC and the EOF.

3.

The onsite meteorological data which will be made available through remote interrogation should be identified.

4.

The applicant will be requested to demonstrate the capability to maintain adequate (i.e., greater than 90%) data recovery during plant operation.

RESPONSE

The Meteorological Measurement Program is being upgraded to comply with the criteria of NUREG-0654 and Regulatory Guide 1.23, Proposed Rev. 1.

Meteorology will be monitored at three (3) locations.

The primary location is Tower No. 1, while Tower No. 2 will serve as a redundant alternate to Tower No. 1.

The other location will be the Satellite Tower.

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DRAFT The existing aerovanes_are being replaced with wind speed and direction sensors meeting the requirements of Regulatory Guide 1.23.

The hygro-thermograph at Tower No. I will be replaced by a Lithium-Chloride dew point sensor.

Data from Tower No. I and from Tower No. 2 will be recorded on st.-ip-charts at the base of the respective tower, and in the control rooe.

Data from the Satellite Tower will be recorded on strip-charts in the control room only. Data from all three (3) locations will also be logged by a data-logger in the control room, and input to the Radiation and Meteorological Monitoring System (RMMS) in the Technical Support Center (TSC). Towers No. I and 2 will transmit data to the control room by means of independent communication lines.

Data from this system will be presented to the EOF and Control room on CRT displays. The meteorological data is also used by the Class A model for accident dose assessment.

The following information is provided in response to the additional items relevant to the meteorological measurements review.

Item numbers refer to numbers in DSER, Meteorological Section, Question 5.

1.

Meteorological data from the primary location (Tower No. 1) will be available from the RMMS in the TSC, and from strip-chart recorders in the control room. Tower No. 2, which is a redundant backup for Tower No. 1, will provide data to the RMMS and to the control room on strip-chart recorders. Data from both Tower No. I and Tower No.

2 will be recorded on strip-charts at the base of the respective tower.

3.

The meteorological data to be made available through remote inter-rogation of the RMMS will be in accordance with Table B-3, Regulatory Guide 1.23, Proposed Rev. 1.

4.

The upgraded meteorological measurement program will be operational by October 15, 1983. The applicant is prepared to demonstrate the capability to maintain data recovery of 90% or better for a minimum of one (1) year prior to fuel load with the present meteorological system, and after October, 1983 with the upgraded system. This data will be submitted to the NRC for review prior to fuel load.

CJO/dg/QU/2 1

DPsAmsaw rB REQUEST m R ADDITIONAL IN MRMATION fEfEORDIOGY 451.14 Your response to question 410.85 is not emplete in that no analysis of diesel generator or residual heat renoval service water punp failures at 106 F is provided. An ambient taperature of 97*F for the HVAC systems will be exceeded at least for one hour every two years, on the average. An ambient tenperature of about 108 F will be exW at least for one hour every 100 years, on the average. 'Ihese average return periods are based on analyms provided in NUREG/CR-1390, "Protnbility Estimates of Tenperature Extremes for the Contigous United States." You stated that, on the average, hourly temperatures will equal or exceed 95 F, the design taperature, less than 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br /> per year, which means that the total hours of this ta perature exceedance can be greater than 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br /> during a given year. Since the design tenperature has a high probability of being exceeded, provide the following information:

(a) Provide analyses of the ambient tenperatures and their durations at which the diesel generators and residual heat removal service water punps would fail.

(b) Provide an evaluation of the probabilities of these failures.

(c) Provide an evaluation of the acceptability of these failure rates and the actions which will be taken to mitigate these failures, should a failure be uminent.

(d) Verify that any necessary equignent to mitigate these failures will be available onsite.

RESPONSE

The above concerns are addressed in the revised response to tsC Question 410.85. Outdoor taperatures between 95*F and 106*F would not result in the '

failure of any safety-related equignent in the diesel capartments or the spray pond punphouse.

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ms FSAa QUESTION 410.85 (Section 9.4.6, 9.4.7)

(a) Assuming the outside air tmperature is at its maximum value of 106*F, verify that diesel generators will not fail at full load.

Specify the maximum temperature in the diesel generator cell.

(b) Assuming the outside air tenperature is at its maximum value of 106*F verify that no mergency or residual heat renoval service water pump will fail. Specify the maximun temperature in the spray pond punp rocm.

RESPONSE

The design basis for the outdoor air temperature used in designing the HVAC systms for the spray pond pumphouse and for the diesel generator enclosure is in accordance with the 1977 ASHRAE Fundamentals, Volume 1, Chapter 23. The use of ASHRAE is consistent with the practices used by other plants in the nuclear industry. Table 1 of Chapter 23 of the 1977 ASHRAE Fundamentals shows that the highest 1% design dry-bulb tenperature areas around Limerick is 94 F.

A design outside air tenperature of 95 F was conservatively used for Limerick, which corresponds to a maximum internal rom temperature of ll5*F for both items a) and b) above. The dieml generators and emergency and residual heat removal service water purps were qualified to operate at this design rocm temperature throughout their normal operating lives and any accident conditions.

The 1% design dry-bulb temperatures provided in ASHRAE represent values that have been equalled or exceeded for 1% of the total hours during the sumer nonths of June through September.

In a normal suniner, there would be less than 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br /> at or above this value. Even when the design value is exceeded, it would not normally be exceeded by a large amount. The data frm Limerick Weather Station 1 (Table 2.3.2-52) shows that the maximum temperature was 96.2 F for the period between January 1972 through Dec mber 1976. The use of 106 F, the maximum temperature recorded in Philadelphia over the last century, does not represent a realistic design basis.

The few hours a year in which the rocm temperature might exceed ll5*F due to an outside air temperature between 95 F and 106*F would not adversely affect the operation of the safety-related equipmnt in the diesel cmpartments or the spray pond pumphouse. The higher rocm tenperatures would not cause a prmpt failure of any safety-related equipment in these cmpartments. Rather, rocm tenperatures above 115 F would only tend to shorten the long-term life of the equignent. Since the rocm tmperatures will be below ll5*F nore than 99% of the time, thermal aging would be insignificant.

i

,y DRAET

'"" ^"

CHAPTER 2 TABLE OF CONTENTS (Cont'd)

Section Title 2.3.2 Local Meteorology 2.3.2.1 Normal and Extreme Values of the Meteorological Parameters 2.3.2.2 Potential Influence of the Plant and its Facilities on Local Meteorology 2.3.2.3 Topography 2.3.3 Onsite Meteorolooical Measurements Program ___

1 Meteorological Measurement system 2.3.3.

Measurements and Instrumen 1

t.

A 28 -

2 2.3.3.3 tion and

~

ce Procedures 2.3.3.4 Data A ocedures 2.3.3.5 i e Meteoro Locatinne 2.3.4 Short-Term (Accident) Diffusion Estimates 2.3.4.1 Objective 2.3.4.2 Calculational Procedure

(,

2.3.4.3 Cumulative Frequency Distribution of X/O 2.3.4.4 Accident X/0 Values for Release Periods Greater than Two Hours 2.3.5 Long-Term (Routine) Diffusion Estimates 2.3.5.1 Meteorological Input 2.3.5.2 Plume Rise 2.3.5.3 Diffusion Model 2.3.6 References 2.4 HYDROLOGIC ENGINEERING 2.4.1 Hydrologic Description 2.4.1.1 Site and Facilities 2.4.1.2 Hydrosphere 2.4.2 Floods 2.4.2.1 Flood History l

2.4.2.2 Flood Design Considerations 2.4.2.3 Effects of Local Intense Precipitation 2.4.3 Probable Maximum Flood (PMF) on Steams and Rivers 2.4.3.1 Probable Maximum Precipitation (PMP) 2.4.3.2 Precipitation Losses 2.4.3.3 Runoff and Stream Course Models 2.4.3.4 Probable Maximum Flood Flow 2.4.3.5 Water Level Determinations l

2.4.3.6 Coincident Wind - Wave Activity l

2.4.4 Potential Dam Failures Seismically Induced 2.4.4.1 Dam Failure Permutations l

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DRAET

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i CHAPTER 2 TABLE OF CONTENTS (Cont'd)

Section Title 2.3.2 Local Meteorology 2.3.2.1 Normal and Extreme Values of the Meteorological Parameters 2.3.2.2 Potential Influence of the Plant and its Facilities on Local Meteorology 2.3.2.3 Topography 2.3.3 Onsite Meteorological Measurements Program ___

1 Meteorological Measurement syster 2.3.3.

Measurements and Instrumen

~

1a e -

m 2.3.3.3 tion and ce Procedures 2.3.3.4 Data A cedures 2.3.3.5 1 e Meteoro Locatinne 2.3.4 Short-Term (Accident) Diffusion Estimates 2.3.4.1 Objective 2.3.4.2 Calculational Procedure 2.3.4.3 Cumulative Frequency Distribution of X/O 2.3.4.4 Accident X/O values for Release Periods Greater than Two Hours 2.3.5 Long-Term (Routine) Diffusion Estimates 2.3.5.1 Meteorological Input i

3.3.5.2 Plume Rise 2.3.5.3 Diffusion Model 2.3.6 References 3.4 HYDROLOGIC ENGINEERING 2.4.1 Hydrologic Description 2.4.1.1 Site and Facilities 2.4.1.2 Hydrosphere 2.4.2 Floods l

2.4.2.1 Flood History 2.4.2.2 Flood Design Considerations 2.4.2.3 Effects of Local Intense Precipitation 2.4.3 Probable Maximum Flood (PMF) on Steams and Rivers 2.4.3.1 Probable Maximum Precipitation (PHP) 2.4.3.2 Precipitation Losses 2.4.3.3 Runoff and Stream Course Models 2.4.3.4 Probable Maximum Flood Flow 2.4.3.5 Water Level Determinations 2.4.3.6 Coincident Wind - Wave Activity l

2.4.4 Potential Dam Failures Seismically Induced 2.4.4.1 Dam Failure Permutations 1

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DRAFT LGS FSAR 2.3.2.2.2.2 Emergency Spray Pond The ultimate heat sink at the Limerick Generating Station is a During routine operations this pond will not be spray pond.

heated, and water temperatures will fluctuate in response to ambient meteorological conditions in the same manner as any natural pond of the same size.

This should produce no adverse impact to the locel meteorology.

2.3.2.3 Topocraphy The topography of the LGS site is described in Section 2.1.1.

The topography of the region surrounding the site, out to a distance of 50 miles, is summarized in Table 2.3.2-86 which lists the offsite terrain elevation (in feet above mean sea level) versus distance from a point midway between the Limerick vents.

The value listed is the maximum elevation on or outside the site boundary which occurs within each of the sixteen 22-1/2 degree sectors at the distance listed.

These terrain elevations' were obtained from USGS maps.

2.3.3 ONSITE METEOROLOGICAL MEASUREMENTS PROGRAM The onsite meteorological measurements program at the Limerick site began on December 10, 1970 with preliminary wind measurements taken from a six-bladed Aerovane located 30 feet above grade on a temporary pole.

Windspeed and direction data j

were continuously collected at the temporary pole until December 28, 1971 when it was removed from service.

Prior to the sensor removal, the onsite meteorological measurements program was expanded on December 10, 1971 with the installation of Weather Station No. 1 near the temporary pole location.

The main tower (Tower No. 1) extending about 281 feet above grade (250 feet MSL) was erected on high ground, northwest of the reactor locations.

i Windspeed, wind direction, and temperature from three elevations are continuously recorded.

Instrument elevations are listed in Table 2.3.3-1.

Additional onsite measurements of horizontal and vertical wind direction fluctuations, relative humidity, barometric pressure, and precipitation complete the observation at Weather Station No.

1.

In order to evaluate the effects of the shallow Schuylkill River Valley, the onsite meteorological measurements program was again expanded on December 28, 1971 with the installation of a second weather station.

Weather Station No. 2 is located across the Schuylkill River from the main tower and is onsite in an open field having a base elevation close to that of the valley floor.

Tower No. 2 at this location, extends 314 feet above grade (121 feet MSL).

Windspeed, wind direction, and temperature from three elevations are continuously recorded.

Tower 2 was 2.3-25

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cstablished to provide supplementary site data on the temperature This profile in the valley during the preoperational period.

tower was instrumented at mean sea level elevations coincident 1 in order to compare meteorological with those of Tower conditions over the valley with those over the adjacent low The locations and relationships between the various wind hills.

cnd temperature instruments are shown in Figures 2.3.3-1 and 2.3.3-2.

The overlapping arrangement of the facilities, which allows a comparison of wind and temperature measurements from each tower at two corresponding levels, produces a complete picture of wind flow and lapse rates from the valley bottom to a point about l

270 feet above the higher terrain.

To determine the typical flow over the river and adjacent low

~

terrain, a satellite to Weather Station No. 1 was established and 1974.

The sensors are r

located 32 feet above grade 106 feet (MSL) and are capable of N I) data collection began on November 20, ing windspeed and wind direction.

gs c9tinuouslym 2.3.3.

eorolooicalMeasurementSystemh%~/f

.a Thhmeteorologicalsystem to obtain measurements as der, crib d in Table 2.3.3-1.

3'5,lo easurements and Instrumentation

).I A3'.

Siting As shown in Figures 2.3.3-1 and 2.3.3-2, the main meterological 1ccated at Weather Station No. 1 is a 280-foot wrather Tower 1 tower situated approximately 3000 feet NW of the Limerick Weather Tower 1 is also located approximately Otructure vents.

2000 feet NNW of the center of the Unit,1 cooling tower location cnd approximately 2400 feet NW of the center of the Unit 2 cooling tower location.

Grade elevation at Wgather Station No. 1 is 250 feet MSL.

gg 6gia&gt The wind instruments on Tower 1 a mounted on retractable booms extending upwind 10 feet 0 incha west of the tower.

Each face of the triangular tower is M L J r f ~ " wide.

The temperature consors are located in aspirators and are 2 feet 0 inches from I has a base surface made of Weather Station No.

the tower.

The relative humidity sensor is located in a standard ycrdstone.

U.S. Weather Bureau-type shelter 5 feet above grade and the ~

curface beneath the instrument shelter is wood.

j Mateorological Weather Tower 2 located at Weather Station No. 2 is a 310-foot tower situated approximately 2100 feet west of the Limerick structure vents.

Weather Tower 2 is also located opproximately 1950 feet WSW of the center of the Unit 1 cooling t

2.3-26 Pe

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tower location, and approximately 2600 feet WSW of the center of l

the Unit 2 cooling tower location, g $ Mgr The wind instruments on Tower 2 re mounted on retractable booms extending upwind 10 feet 0 in es WNW of the tower.

Each face of the triangular tower is "

^

wide.

The temperature sensors are located in aspirators and are 2 feet 0 inches from Weather Tower 2 has a base surface made of yardstone.

the tower l

Instrumentation and Performance Specifications 1

1 2.3.3 The instrumentation systems installed on the Limerick site were designed to meet the NRC requirements at the time of installation and they generally meet those of Regulatory Guide 1.23.

Any deviations from Regulatory Guide 1.23 are described in the I

following subsections.

The manufacturers' specifications and accuracies for the sensors Deviation and associated equipment are given in Table 2.3.3-2.

from paragraph C4 of Regul,atory Guide 1.23 regarding the system I

accuracies is discussed and justified in the following sections on each e of measurement.

e 2.3.3 Windspeed The Bendix Aerovane Wind Transmitter, Model 120, measures windspeed by means of a six-bladed rotor coupled to the armature of a tachometer magneto located in the nose of the instrument.

The output voltage is directly proportional to the impeller rotation speed and, therefore, is a function of windspeed.

This Aerovane system is used on Towers 1 and 2 at Limerick.

t As shown on Table 2.3.3-2, some of the instruments do not meet

(

the required starting speeds.

This presents no problem because real calm conditions with absolutely no air motion are extremely Measured calms can be far more frequent, rare at most sites.

depending on the threshold speed of the instrument used.

At Limerick, the number of calm hours recorded on the six-bladed All levels of both Towers 1 Aerovane is shown in Table 2.3.3-3.

The and 2 are instrumented with these six-bladed sensors.

175-foot instrument at Tower 1 is at the elevation representative With only 1.7% calm hours, a more sensitive of vent releases.

The instrument could not produce any significant improvement.

30 foot level of Tower 2 does have a high percentage of calm With this in mind, light wind hours due to its valley location.

instruments meeting the recommendations of Guide 1.23 were As shown in installed in the valley on the satellite tower.

Table 2.3.3-3, the light wind sensor also produces a large (17.5%) number of calm hours.

Experience with both types of instruments indicates that the continued durability and accuracy f

of the six-bladed Aerovane far outweighs the advantage of the 2.3-27

---n..

,.,_,_,,n.

DRAFT LGS FSAR O

Olightly lower threshold speed offered by the light wind instruments.

Regulatory Guide 1.23 also specified 90% data recovery, which is considered equally important.

The satellite tower uses a Bendix-Friez 3-cup anemometer, P/N 2416914, to determine windspeed.

The 3-cup anemometer has cone-shaped cups formed of 0.010 inch thickness aluminum.

The cup wheel is attached to a stainless steel shaft which rotates, via coupling, the tachomete'r generator.

The output voltage is is directly proportional to the speed of rotation and, therefore, o functi of windspeed.

2.3.3 Wind Direction The Bendix Aerovane Wind Transmitter, Model 120, measures wind i

direction by coupling a streamlined vane to a type 1HG synchro.

This synchro electrically transmits the position of the vane and, therefore, the wind direction to the recorder.

The satellite tower uses a Bendix-Friez Wind Vane, P/N 2416970, to determine wind direction.

This wind vane is very light and censitive having a low moment of inertia.

Changes in azimuth cngle are transmitted, via coupling, to a synchro.

The signal output from this synchro is directly proportional to the angular position of the vane and, therefore, wind direction is transmit e to a synchro in the recorder.

2.3.3.

Temperature The ambient temperature measuring system uses Leeds and Northrup 100 ohm copper thermohm sensors (resistance thermometers).

These thermohms are accurate to 20.20F across the range of -100 to 1100F.

The detectors use four'leadwires, two of which are connected to a constant current source and the other two leadwires are connected, via electronic amplifiers to an analog recorder.

Contained in the constant current loop is the copper censuring coil, whose resistance varies with temperature, causing the voltage drop across the coil to change proportionally.

This voltage drop is then sensed by the measuring loop of a null balance potentiometer having a scale calibrated in degrees fahrenh 2.3.3.

Temperature Difference The temperature difference sensors at the Limerick site are identical to the ambient temperature sensors, except for the celection of matched sets.

These sets have an accuracy of t0.loF Ceross a -120 to +120F temperature difference range.

The reference therschm (el 26 feet) is connected (opposite in polarity) to both upper elevation thermohms.

The two voltage drops (one from each set) are algebraically added, and the g

2.3-28

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D resulting output is equivalent to the temperature difference reading.

Both the ambient temperature and. delta temperature sensors are located in a Teledyne/Geotech aspirated thermal radiation shield, Model 327.

This is to ensure the measurement of ambient temperature and temperature gradients substantially independent of solar tmospheric, and terrestrial thermal radiation.

2.3.3.

Relative Humidity The Bendix Hygrothermograph, Model 594, is used at and around the Limerick site to determine both relative humidity and ambient air temperature.

The relative humidity portion of the instrument consists of a hair-type humidity-responsive element, a lever system, and a cylindrical chart.

The accuracy of the humidity unit is t 5%

which includes the temperature effects to which the instrument may be subjected.

The temperature-responsive unit consists of a Bourdon tube, a lever system and a cylindrical chart (same cylinder used for humidity).

The accuracy of the hygrothermograph temperature unit is : loF.

Regulatory Guide 1.23 suggests that at sites where there may be i

an increase in atmospheric moisture content (i.e., cooling i

towers) dew point or humidity should be measured on the tower.

The results of published field studies (Refs 2.3.3-1 through 2.3.3-4) prove conclusively that the only changes in atmospheric moisture characteristics which may be experienced from cooling tower operation would occur at the plume elevation, not at the ground level.

The results of approximately 400 flight test observations indicate that the cooling tower plumes would rise clear of the ground and have no effect on the low level moisture characteristics.

For dewpoint or humidity measurements to have i

any relevance to cooling tower effects, they mu'st be obtained at elevations ranging from approximately 1000 feet to 5000 feet above ground, which is not possible on a continuous basis.

l Since there is little or no potential for fogging or icing conditions resulting from the Limerick cooling towers, there is no need for a dewpoint measurement at the 10 meter level on the tower.

2.3-29

.. l ~

M

J DRAFT 2.3.3./4CalibrationandMaintenanceProcedures 2.3.3.

Calibration All sensors and related equipment are calibrated according to written procedures designed to ensure adherence to NRC Regulatory Guide 1.23 guidelines for accuracy.

Calibrations occur at least every six months, with component checks and adjustments performed when required.

All meters and other equipment used in calibrations are, in turn, calibrated at scheduled intervals.

All instruments used in calibra s are traceable to the National Bureau of Standards.

}

2.3.3.

Maintenance Inspection and maintenance of all equipment is accomplished in accordance with procedures in the instrument manufacturer's manuals.

This inspection occurs at least once a week by qualified technicians capable of performing the maintenance, if l

required.

The results of the inspections and maintenance performed are kept in a log at the site.

The information contained in this log is also transmitted to the environmental l

engineering section and meteorological consultant.

In the event that the required maintenance could effect the instruments calibration, another calibration is performed prior to retur 'ng the instrument to service.

le 9 2.3.3.Jwe Data Output and Recording Systems All meteorological outputs, at this time, are recorded by analog systems.

The charts from these systems are sent on a weekly l

. basis to the applicant's meteorological consultant, l

Meteorological Evaluation Services, Amityville, New York, for i

inspection to detect discrepancies or evidence of malfunction and data analysis.

The analog recording systems for the weather towers are enclosed in a str ure with thermostatically controlled temperature.

8 ' ' & 3 '. 3 Data Analysis Procedures k.9' ',.3.i2. 3. 3.u.y 5 Data Quality Control All data are subject to a quality check by Meteorological Evaluation Services.

These analog charts are inspected for the following items:

a.

Verification of log sheets versus actual charts received O

b.

Time continuity 2.3-30 g

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c.

Instrument malfunction d.

Inking problems e.

Directional switching problems f.

Negative speeds g.

Missing data An evaluation of system performance is made monthly.

The percentage of data recovery for Limerick Weather Station instrum ntation is shown from 1972 through 1976 in Section 2.3.2.

3.@'I.1 V IN3 p3.3.4(d> Data Reduction All readings that are taken from the strip charts represent hourly averages (except where noted).

l Data are reduced into the different categories as follows:

Wind a.

Windspeed:

hourly average speed.

Negative speeds are l

recorded as read.

b.

Wind direction:

hourly average direction i

i c.

Span:

The span is read from the same portion used to obtain the average direction.

Span is defined as the l

width of the direction trace excluding any abnormal spikes.

Maximum span read is 3600 d.

Gustiness:

The gustiness is read from the same portion of the chart used to obtain the average direction.

Gustiness and its characteristics are described in Ref 2.3.3-5.

. Temperature and Humidity a.

Hygrothermographs:

All relative humidity and temperature readings taken from a hygrothermograph are i

instantaneous readings on the hour.

l b.

Ambient temperature: Recorded on a strip chart, hourly average temperature manually recorded.

c.

Delta temperature: Recorded on a strip chart; hourly average temperature manually recorded.

l 2.3-31

LGS FSAR S'

2 3.3.

Analyses The hourly data obtained'(as described) have een compiled into the series of summary tables described in S tion 2.3.2.

These data are used as inputs to the computatio of the X/O estimates described in Sections 2.3.4 and 2.3.5.

2.3.3.jf' Offsite Meteorological Monitorino Locations l l' g*

Orm & fx ** ! Mm ^

The Limerick meteorological data 4have been c6mpared with offsite date from the Philadelphia and Allentown, Pa. National Weather

' Serv' ice (NWS) Stations and with the data from the Philadelphia Electric Company Peach Bottom Atomic Power Station.

Whenever j

possible Limerick parameters were compared with concurrent data from the regional stations to assess their similarity, as well as with the longer term records from the regional stations to~ assess the' climatological representativeness of the time period during l

which the Limerick site data were obtained.

1 l

The following are brief descriptions of the offsite measurement locations:

2.3.3.

1 Philadelphia The Philadelphia NWS station.is presently located at the Philadelphia International Airport, approximately 31 miles southeast of the Limerick site.

The airport is located on the l

southern edge of the city, bordered on its southeast side by the Delaware River.

The' area is relatively flat, with no appreciable terrain roughness'to fnfluence the data.

The Philadelphia NWS met'corological sensors have been moved several times during the period of record used in the longterm comparisons.

,In 1960, the NWS established standard elevations l

for all meteorological sensors, and the instrument locations have remained unchanged since that time.

A complete history of the sensor locations at the Philadelphia NWS station 1G shown in Table,2.3.3-4.

2.'3.3

.2 Allentown The Allentown NWS station is located approximately 31 miles north l

of the' Limerick site at the Allentown-Bethlehto-Easton Airport.

l The station is 5 miles northeast of the city'of Allentown in the l

Tahigh River Valley.

The' river valley is surrounded by rolling terrain and numerous cmall streams, but there are' also some larger terrain features in the arer'.

Blue Mountain is a ridge located 12 miles north of Allentown,sranging between 1000 to 1900 feet high.

South Mountain, ranging between 500 and 1000 feet high, is located on the southern edge of Allentown.

However, neither of these two pih=

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cc y /y w-/G bc. Gn M'c

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upsd W

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$' ?.*? T h..)S.. Aa S

[

Mk f k __

s

.. [.... _.._.__,/ f

._ 4.6 h

.N. M_ (.

t er.ts and Irstrumentation easu Siting y,3 p '

the main meterological As shown in Figures 2.3.3-1 and 2.3.3-2, 1 is a 280-foot located at Weather Station No.

weather Tower 1 tower situated approximately 3000 feet NW of the Limerickis also located app Weather Tower 1 1 cooling tower location structure vents.

2000 feet NNW of the center of the Unit cnd approximately 2400 feet NW of the c' enter of the Unit 2 Grade eleva 1

l cooling tower location.

l is 250 feet MSL.

9 h/nderf mounted on retractable booms i

The wind instruments on Tower 1 a west of the tower.

Each face extending upwind 10 feet 0 inch The temperature of the triangular tower is 4 f at ; mwes wide.

sensors are located R. ssp!rators and are 2 feet 0 inches from

. Weather _ Station #c.u.1 has a base surf ace made ofyt +pch. h,c cu.

gx_

A c/cw. pied

• fes,Jer 1s' If cmg l

the tower.

2 b'ft t t { l6'A b t%

l yardstone.

gy,hy a T ffx Meteorological Weather Tower 2 located at Weather Station No. 2 is a 310-foot tower situated approximately 2100 f eet west of the Weather Tower 2 is also located Limerick structure vents.

approximately 1950 feet WSW of the center of the Unit 1 cooling l

-r, N V#

/

-- - - a: : - -

J.

^

..p.x(eofgg73

/

6' M D 'N i'C 7'

.f I' I d.% n-~'lt f h u

/

M -b 4 b {/ TU( /Ot a

• . "

• r 6 si Jc e'

.f lire tower Ioestion, and approximately 2600 feet WSW of the center of the Unit 2 cooling tower location, g 6,W The wind, instruments on Tower 2 4re mounted on retractable booms Each face of extendingupwind10 feet 0ing'esWNWofthetower.

the triangglar tower is 4 fte.

U.ch::; wide.

The temperature sensors ar4 located in aspirators and are 2 feet 0 inches from Weather Tower 2 has a base surface made of yardstone.

the tower.

3.3 Instrurentation and Performance Specifications j,

q S.Y' j

The instrumentation systems installed on the Limerick were designed to meet the NRC requirements " "

_I:::____.

^ '

, ____ _. _ _. of Regulatory Guide 1.23.E e 2

. : _ ;.7 L 7;7 7 c '- - - ~ ~ -

7 The manufacturers' specifications and accuracies for the' sensors and associated equipment are civen in Table 2.3."-4.

rv ny i.N 2.3.3.D e Windspeed 9

The Bendix Aerovane Wind Transmitter, Model 120, measures windspeed by means of a six-bladed rotor coupled to the armature of a tachometer magneto located in the nose of the instrument.

The output voltage is directly proportional to the impeller rotation speed and, therefore, is a function of windspeed.

This I

Aerovane system is used on Towe9' 1 &ar- = R70-6..ct clm AOL -

.o

- mxm= -~

'jI'5 b1S bync* ? 5' ng f,4..,,.g j g

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m- - m wr S.,1, t u

g.& E ne m,ex1on DRAFT The Bendix Aerovane Wind Transmitter, Model 120, rneasures wind direction by coupling a streamlined vane to a type 1HG synchro.

This synchro electrically transe'ts the positioJ of the vane and, a

therefore, the wind direction to the recorder. L TI if L.' Ji rl i1. '..

Tc h i i-l'

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9 3 L l'f flid $Y'i 6t D; c b ' hit.

IT +Davezd uKDy G a n % tc 5 Li/?

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pand s v: th ot c.<tpy c ft F v. its t

a c c, rap c-rd&

9t$ - 3t 'l=

ti

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/cPwA n 4<-aspi,* M

% i,-1.ftx ld.ct.- 7stinf.sl,ie fr( x f ikt f

sv~c.

i c N s c hin 'g.c /d snJ ku t S pearf'<c.

sc:iu r.

t

7 R) t

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Z 9.3,2-,l.

DRAFT

/k c ?:he %

ir su e: n.<,-( u: '., :

2. e / ;%

s 4)%

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%7c,

/-tu k

(,f %, q u j,,g

.4 4

C Arc W L n

cy n e!5 (i C / in c lu f.f L.i 76, W<

c e ej c. I*-:5 i:. :

ch t.:..:I ho f,j, 'l.w.a m c

s.,s %t --

Ns L ?.6s 1.n ia. Y ft.h:G ir nte an 198 'cd l\\'

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icc c ?7-l. &

4:Lu? nr f-kr u nit, 14,'

/ti 747, caa,2h cf E.n u n kt t w(

k

,f-1)

Cc1 M r7Tt s. <.d.

{lh M.u l u

f'k (n G u Y cz m ts

& a (

.6~rt/f s w./

c c. n. ins Sip: n l, Tiv.

cu n lTr w i!!

tceyc/c

'i'r i

Ct.fk.

llt rit u.,itN<

'l ?, }.

2, 3, J:

Dr.fie Gnzmw1lv Ocx Cm Q' Drip /mf 1,3.'J. L I./0

//

Data from Tower No. I and from Tower No. 2 will be recorded Data from the Satellite Tower will be recorded on strip c on strip-control room only.

logged by a data-logger in the control room, and inputData from all t arts in the and Meteorological Monitoring System (RMMS) in the Technica]

to the Radiation Center (TSC).

Towers No. I and 2 interface to the control room by means Support of independent communication lines.

Data from this system will be presented to the EOF and Contr l on CRT displays.

model for accident dose assessment.The meteorological data is also used by the Clas o room 4

i.

_-_m-

G1 si

. Q UL L {

Alo\\ T p p7f LGS TSAR DE EF45oere

.3./ Calibration and Maintenance Procedures 5

Calibration All sensors and related equipment are calibrated according to written procedures designed to ensure adherence to NRC Regulatory Guide 1.23 guidelines for accuracy.

Calibrations occur at least every six months, with component checks and adjustments performed when required.

All meters and other equipment used in calibrations are, in turn, calibrated at scheduled intervals.

All instruments used in calibrations are traceable to the National Bureau of Standards.

Maintenance M. 3 %.Z.b Inspection and maintenance of all equipment is accomplished in accordance with procedures in the instrument manufacturer's manuals.

This inspection occurs at least once a week by qualified technicians capable of performing the maintenance, if required.

The results of the inspections and maintenance perforred are kept in a log at the site.

The information contained in this log is also transmitted to the environmental engineering section and meteorological consultant.

In the event that the required maintenance could effect the instruments calibration, another calibration is performed prior to returging the instrument to service.

APS 2<3.~3. MT Data Output and Recording Systems S,3.1. 2. 2.3 All meteorological outputs, at this time, are recorded by analog systems.

The charts from these systems are sent on a weekly

, basis to the applicant's meteorological consultant, Meteorological Evaluation Services, Amityville, New York, for inspection to detect discrepancies or evidence of malfunction and data analysis.

The analog recording systems for the weather towers are enclosed l

in a strty/ture with thermestatically contre 11ed temperature.

l e$'3,2.3 hT 2.3.3 g Data Analysis Procedures q,$ I S

,$.}. 3r3733.Wd rr Data Quality control All data are subject to a quality check by Meteorological Evaluation Services.

These analog charts are inspected for the l

following items:

a.

Verification of log sheets versus actual charts received O

b.

Time continuity t

Q Map l --

.Ac.K[M)e,t LGS FSAR c.

Instrument malfunction E

5 d.

Inking problems Directional switching problems e.

f.

Negative speeds a

g.

Missing data N N6 ' C A

6 g-An evaluation of system performance is made monthly 3 v

g

(

MO 3

Meb Y

E, l

1 d '3,t.3,'Z-SN.T an J-;3.3.g Data Reduction All readings that are taken from the strip charts represent hourly averages (except where noted).

i Data are reduced into the different categories as follows:

Wind

~

l a.

Windspeed:

hourly average speed.

Negative speeds are recorded as read.

b.

Wind direction:

hourly average direction c.

Span:

The span is read from the same portion used to obtain the average direction.

Span is defined as the width of the direction trace excluding any abnormal spikes.

Maximum span read is 3600 N

l e[

Gustiness, - (7Ek'ir Nc, I binN1 L (H

.)

1 d.

The gustiness is read from th same portion of the ch rt used to obtain the average direction.ftr E (#'d.

i l

Gustiness and its characteristics are described in ll Ref 2.3.3-5.

PC r1T Temperatureand:.p:

/

k' 1_,

Dek' IE irti.! Et tt*filt{ ra A Stdh Clts,7j lit.irlj s.

dIir0 L Cf(c.* fainY

&nt 'it ntgn st a /

It uS-h b.

Ambient temperature: Recorded on a strip chart; hourly average temperature manually recorded.

c.

Delta temperature: Recorded on a strip chart; hourly average temperature manually recorded.

g Mciffidich Sea,rlui ca a. Stf> chirT; t ult rl3cidY 5 R ' "{ie3isJI C,c / int 4s e f

1 1,*

<( tw77r. In-1 10' p :h h k 7f" -

, m u x rf.

sh p oox tMt c

me 97 H piagiYu m 4,- 4 Ira.n i

ZZ n' e- - _Re -

" ' ' - ~ '

- - - - = - -

g 7.' ~5 L

,q p ~

I-s,3 u

,)y,,,

i The hourly data obtained (as described) the series of summary tables described in Section 2.3.2.have been compiled into data are used as inputs to the computation of the X/O estimates These described in Sections.2.3.4.and 2.3.5.

T yS t

t l

I t

e

~ - * - - - - _ _ _

a

l

~

DRAFT [g

~

l LGS FSAR f

(gJ.),%S W

mountains is close enough to the Allentown NWS station to have any direct effect on the local meteorology.

The Allentown NWS meteorological sensors have been moved between various elevations

~

and locations during the period of record used in the long-term comparisons, but were moved to the standard NWS elevations in 1965, and have remained unchanged since that time.

The complete history of the sensor locations and elevations is shown in i

~

l Table 2.3.3-5.

2.3.3.

.3 Peach Bottom Atomic Power Station No. (PBAPS)

Weather Station No. 2 at the PBAPS is located approximately l

48 miles southeast of the Limerick site.

The Peach Bottom plant is located in the Susquehanna River Valley, but Weather Station No. 2 is a 320 ft, tower situated on a hill overlooking the valley.

The 320 ft. wind sensor at Weather Station No. 2 is at an elevation comparable to the upper level Limer'ick wind sensors, and therefore provides a useful check of the representativeness of the meteorology.

2.3.4 SHORT-TERM -(ACCIDEN'T) DIFFUSION ESTIMATES 2.3.4.1 Obiective D

Estimates of atmospheric diffusion (X/0) are made at the exclusion area boundary and the outer boundary of the low population zone (LPZ).

These estimates are made for periods of 2, 8, and 16' hours, and for 3 and 26 days following a postulated accident.

The section-dependent model in Draft Regulatory Guide 1.XXX (Ref 2.3.4-1) is used.

2.3.4.2 Calculational Procedure l

The calculation procedure used to determine X/O for the I

appropriate time periods following a postulated accident is described in Draft Regulatory Guide 1.XXX.

The diffusion model presented in this guide is used to determine X/O values for the first two hours following the accident.

X/0 values for longer time periods are determined by logarithmic interpolation between the two-hour accident value and the annual X/O at each receptor point.

The annual X/O values are calculated using the model described in Regulatory Guide 1.111 (Ref. 2.3.4-2).

l The Limerick emission is classified as a low-level release l

according to the criteria of Draft Regulatory Guide 1.XXX.

This i

requires that the source be treated as ground level.

This assumption is also made in the annual X/D calculations.

)

.a

~'W-~~.

(

DRAFT

"" "^"

TABLE 2.3.3-1 l

LIMERICK GENERATING STATION

' INSTRUMENT ELEVATIONS ( * )

JYl CDP 2kyraVAL HCT6X/dKAL MDSVAYMT #57DL1

\\/YIO~$';yb WEATHER STATION NO. 1 WEATHER STATION NO. 2 1

Main Tower Weather Tower No. 1 Weather Tower No. 2 Grade el 250 el 121 Wind speed and el 280(30')

el 151(30')

wind direction el 425(175')(5) el 280(159')

el 520(270')

el 425(304')(s)

Horizontal and el 400(150')(a) vertical wind fluctuation Temperature el 255(5')(*)

el 126(5')(*)

el 256(6')

el 147(26')

el 276(26')

Temperature el 421 - el 276 el 276 - el 126 difference (171'-26')

(155'-26')

el 516 - el 276 el 421 - el 126 (266'-26')

(300'-26')

Relative humidity el 255(5')

Rain gage el 255(5')

Satellite Tower Grade el 106 Wind speed and el 138(32')(8) wind direction (8) All elevations refer to mean sea level (MSL).

The figure in parentheses after the elevation above MSL refers to the height of the sensor above grade.

(a) This location is for a bivane used for specia'l studies (removed from service 3-7-77).

All other wind instruments on Tower No. 1 and Tower No. 2 are six-blade Aerovanes.

)

Bendix Wind Vane; 3-cup anemometer and wind vane (8)

(*) Ambient temperature in the control structure (s) Structure vent release elevation

,,;,p,y. p,g.7 _. 9 9 _.y ap;'.< g y. (

~,_

s....

.g. y n,. ;_.. ; ;.

m s

l

.: l LG3 FSAP NNWW mENSOR AND BYGTEM STFC1FICATIONS AND ACCUPAC

.-) ?)f L

l' IGNUFACTtipFR/

CONFCNENT PARAMErrB COMPOFEFT SYSTEM (8 )

FFGULATPOY C09W4FirtM/

__MODEL NO.

ASCyPAEJ ACCUP Q CtlIDE

1. 2_3 SPECIFICATTONS i

Aerovane wind Isoeller Bendim/120 speed

9. 5 mph (0- 10 mph) i eenerator and Bendix/191 recorder e 1 mob (>

10 mphp

, start ino scard of 1.8 red (2)

Stopping er=4 of 0.7 arh combination of above conconents

,2 element recorder i

20.5 mph to.5 mph accuraev/

starting speed 1 mph Aerovane wind wind vano and Bendiw/120 32*

l direction Recorder Pendix/141 (2)

Combination of above components 2 element recorder 12' tS*

satellite wind 3-eup anemometer Bendix/2416914 speed

20. 5 meh (0. 5-50 mph) and Pecorder Bendiw/141 (2) startino scaed c.5 erh combination of above components 2 element recorder

(

10.5 mph tO.5 mph accuracy /

\\

startino aveed

< 1 roh 1

satellite wind wind vene Bandlw/2416970 12*

I dLrection Recorder Bendix/141

'(21 I

Combination of above conconents 2 element recorder 12*

15' 3>

rg

--I

\\

l' 9

E w

1 14M FSAR TABLE 2.3.3-2 (Cont'd)

(Face 2 of 21 MMUTACTURER/

CONPONFWT SYSTEN(t)

RECULATPOY COmNFirts/

PAltMEETELt COMPON_Et'I

_NODEL NO.

ACCUPASI ACCUPACY GUIDE 1.23 SPECIFICATTOL85 Trueerature Sensor 1.8 M/8197 10.2'r (ambient) 40'FF-120*F,1 ma 20.0 31 Constant current L818/ 445372 (2) power source 6 points, to seconds /

point Pecorder speedomex 4 10.36*F Dual rence recorder Combination of above componente 2.41'F

t. 5'C (f. 9'F1 f.0.9'F = 10.5'c Teamerature Sensor TA N/8197 AG.1'F (differencel Matched oairs 20.07'T i

j constant current TA N/445372 (2) power source 00*F-120*F,1 ma t.0.0 ?F Recorder ICN/Speedomax W 20.072*F 6 points, 10 seconds /

point f

Combination of above components 10.12'F 10.1*C(t.18'F) 10.1R'r = 20.1'C l

Relative humidity Rumidity eennor Bendix/594 31 20-805 35 20-80s to.5M dew 11.071 FM to M'C 51 > 80%

51 > 80s coint dew coint 4 21*C

{

Temperature Bendix/594 11*F 11* F eenoor (t) square root of the sum of the equares (8) Neo1101ble Error

'Id

DRAFT

~

k/Mt:KdK FSAR SwOnt.

_.2. 3. }.

{

e___.._

N-

...?M -...?:?'.?.~._?...--.......

.?W

..?J'}.~I TARIE L => 0 'f I

(

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l

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.__..._.____.e-..

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,. -. - _.. - Mt tWC.-

'i C

i

/

t 4

1 w

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. - -rr.s w 2.sa-7 n Oz" f3b/{,r, tvL en e a.

me p.

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. emeaw. e.e e6 4

me.e e ee w eN=

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=

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- m em-esi.e..

.e

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-e

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ee=e

- = = -..

e..-=.-oo.._+-

em=-4

+eh..eaa.

.-e e

. - - eum m.e

-SPw.s e w.6

'em-p-O

. m w.e.

e.

au.e,ww-.

.aiieeMe e.>

weeee em e s e.-.

pamme wwm

--we.,

e.w..

ew e.

4h e.>,m mm.e 6m

+.

e,.

pen. W:

.e em

.mm

-Om m -

m e. s.

..me

-m m

e-.

.m mm m -

em 9emn.=e 66 6-.e.

.mm.

Ne w

M hede

.se Me e.P.

e m.e e eeh

.e

.eem-.=

ee.

hw-m em.e om-N."m.

..p een.mpM6

.ehet=,66hempM6

• - - = *N

--e

-.m-+.

M me m.erem M-em h hw +

msy N*--

• hM.*8 e--**N

• e.e-p 8

4'*

M"h 4N.

• .*e mi e - -.

6

--ehe

=-=****eeDe 6

.h

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• m g

66-.*

+

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l

(~

DRAFT LeS m.

TABLE 2.3.3-[

LIMERICK GENERATING STATION INSTRUMENT ELEVATIONS ( >

SyfT[A:.

s O/EK477ow-L-Mc7tKnAGett-M U SU M s c. 7' 4 4Gaet{lilf3,

l WEATHER STATION NO. 1 WEATHER STATION NO. 2 1

l Main Tower Weather Tower No. 1 Weather Tower No. 2 Grade el 250 el 121 Wind speed;esud e3 280(30')

el 151(30')

wind directi.on, el 425(175')4EBCO el 280(159')

p!h e W f 64 t

M1EE2m @

el 425(304') & 0) tvnzd. sped asul tw'm1 direchin (ik n s2 >D e / Sc (;'7c ') (d Temperature el 276(26')

Temperature el 421 - el 276 el 276 - el 126 difference (171'-26')

(155'-26')

el 516 - el 276 el 421 - el 126 (266'-26')

(300'-26')

Ocu'/M f 898i88 iT L Lt?: t f K. el Q -2TL*(2b /

Rain gage el 255(5')

Satellite Tower Grade el 106 Wind speed and el 138(32')(/s) wind direction (8) All elevations refer to mean sea level (MSL).

The figure in parentheses after the elevation above MSL refers to the Q eicht of the sensor above_nrAde _

(2.k_fC2 l8 SfX-hl C.-_b.G!AW 3

L--

g j a--ettk, wm d wra e o CAkwy T Y.

=#--

- - - - ~ ~

(.5.)_5 % Cb'% 06 W RlUf? EktQ $ & __. _

=

s O

O-t 148 FSAP 7

CfYTif11CNAl-l Lit $$'c$*h

(

b?O*S(,'TCAd[NI' SYf'7M(/97 $" '

~

N SENSOR AND SYSTEM RPFCIFICATIONS AMD ACCURACIES IENUFACTUDER/

COMPCMEftf BTSTEM(8)

DFCULATFOY COMMFWYS/

PARAMETER COMPONENT

_ MODEL 100.

PCCUPA C ACCUPACY CUIDs 1.23 SPECIFICATIOPH Arrovane wind Impeller Bendix/120

e. 5 mnh(0- 10 mph) 8tdeting speed of 1.8 mph speed oenerator and Bendix/141 t 1 mob (>

10 mph)

Stopping speed of 0.7 moh recorder (2) 2 (lement recorder Combination of above conconents ib.5 mph

30. 5 mph accuracy /

etartinq speed 1 mph Atrovane wind Wind vane and Bendlu/120 t2' direction Recorder Bendix/141 (2) 2 element recorder Combination of above components 12' 15'

[> a na fi'IIft' Cll'"d'bIS[f'lle

( / 4 II' }

estetsitte wind "T-c te start ing speed d.5 och ge,,, ge c c s i,,,-s, s

a aW<)

Hi,th '* '*'

(

( ' m />,*,34 /4;u t[~ d 't * (- (#7'4 b I

7b e

<seteEMmm wind b'51rf V48tf ClIM4ITh'IS![~fl0

(

pg g, f(g,-

f3#, /,'",,e,/

<C (l4 /

direction 3 * ' C recorder co,~1,rs, ara * ~ al'c'C "T ""g (lgt b '

ygT l

C f;,,'.%""',f'[f,.*b<)-n,

' u a d s,d Ivv:t O c. io M r4nt Cl,'niafim+5/Ric

(/4trr)

,w~L$u i u/t o,,a,r..n / n s v a m )

_ iu,,s v.m 3~** als c

, s<,.

r s e,,,,e - 8.s oeM vs.<,+/,~

• 7

(;1,a,,sejahuu.,jv.m6 (I-cD)

t "U'>

LGS FSA TABLE 2. 3. 3e( (Cont 'd)

(Page 2 of 2)

IEMUFACTUltER/

COMPONFMT SYSTEM (eg 3RggLATpoy compgrytsp g

FARAMETER COtif0t!Eati MooEt too.

ACCUPACT ACCUFACY GUIDE 1.23 SPECIFICATTOltg

(-l W4 ?!99 TICS llt t,t?(- { l'O O'N fog gg,,, p g (f,,q, gyp p

~

T*

9 Seneor Gwittir cIin+1e..in/iecwe (w1en

.yc n iu p e

c I?ees,Jcr C&dae 9f~</%IT (Ls70L p,, f,/*,7 y,,,,,,

Combiniation of above couponents

([477) g, geg)

( /tvide,,a //ccc 6

(/eTFr) f, c 7f;;;c, p,7,.,,,,,, pp i*g," tar

• saaaor r

his/s /cr C//<>tdr"rd//u'/cc-/ (44 79

-/c< Ac.i'c p 7

Esweliirc /, c'wr (/W Mr / /r'i,cif reccrkr li'e terder g

(4 1r1-) A/,5'p[ y[g 4

ca.dination.of above co.

nene.

Pce n Ott see, wr crimansnu/tc1/97

< iag,)

,, g,,.,,,,,,,,,.g; n " +c I.2c 'f=

7;n,f-/tr Cthu tc..n s/tcccs'7

(}qWe) c Rcce, der. EsTGkncAnbus/vyc y GnTid

,,,g7(o.,'A gt/gg,f rec cor/e r

(,777;)

Clin,a tievie s/wa,e..is h < k C aitti hec h or sie.c t ce,- 1,,n a m tcce?i-/

0ek'3 7;p.n,yiin/t y

fr'ecap,hfiht 6;4jc (l,% henn s/tcc747 U alrr) e n'.

7;u,l4fc, l'e<c riler [s fect,i,e A

!6co v,..-llS" MuLff'* f'" A

(c,J si,a(fx & aI,e $ bc,1onreani

(%7(d c cini I

i

(*)

scruere root of the sum of tha naueres l

(8) Negligible Ptror

!