ML20052E779
| ML20052E779 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 05/06/1982 |
| From: | Daltroff S PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | Eisenhut D Office of Nuclear Reactor Regulation |
| References | |
| RTR-NUREG-0654, RTR-NUREG-0737, RTR-NUREG-654, RTR-NUREG-737 NUDOCS 8205110424 | |
| Download: ML20052E779 (7) | |
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- PHILADELPHIA ELECTRIC COMPANY 2301 M ARKET STREET P.O. BOX 8699 PHILADELPHI A. PA.191o1 SHIELDS L DALTROFF nac' a'ic"ra Eion May 6, 1982 Re : Docket Nos. 50-277
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e 50-278
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Mr. Darrell G.
Eisenhut, Director
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Division of Licensing
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Nuclear Regulatory Commission Q
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Washington, D.C.
20555 N
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SUBJECT:
NUREG 0737 Item III.A.2, Meteorological Monitoring System - Peach Bottom Atomic Power Station
Dear Mr. Eisenhut:
This letter requests an adjustment in the implementation schedules established by the NRC for several modifications in the meteorological monitoring system at Peach Bottom Units 2 & 3.
The implementation schedules for this equipment are presented in NUREG-0737, Item III.A.2, in NUREG-0654, and in the Proposed Revision 1 of Regulatory Guide 1.23 issued in September 1980.
Since the revision of Regulatory Guide 1.23 has not been issued, much of the design criteria has not been clarified until recently during informal discussions with the NRC staff.
This situation delayed the initial engineering of the system.
For this reason the finalized sof tware and hardward design, procurement, and installation necessary to satisfy the regulatory guide and NUREG's cannot be completed on the schedule identified in Item III.A.2.
It is our understanding that the NRC is considering a revision to the implementation schedule.
For reasons stated above, we request that the implementation date be extended at least until January 1, 1983.
We are also requesting that the f
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t 8205110424jyh7 PDR ADOCK PDR F
a Mr. Darrel G.
Eisenhut Page 2 compliance dates for the Class B dose model be postponed until an appropriate time after regulatory guidance in this area is issued.
On December 9,1981 PECo personnel met with members of the NRC meteorology staff at Peach Bottom and presented to them our plans for upgrading the meteorological monitoring system.
We did not receive any negative feedback and are proceeding with the system modification.
Attached is a description of the Meteorological Monitoring System currently planned for Peach Bottom.
This system has been engineered based on our interpretation of the regulatory guides and NUREG documents.
All of the system hardware and sof tware have been ordered.
Any comments on areas where our interpretation differs from that of the NRC staff would be appreciated.
Very truly yours, i
/
/,, -neur'cto.
Enclosures
s Docket Nos. 50-277 50-278 i
Description of Meteorological Monitoring Systm Currently Planned The meteorological mnitoring systs, at PBAPS is being nodified to ccrply with Regulatory Guide 1.23, proposed Rev.1 and NURm-0654 criteria.
All of the sensors are being upgraded to neet the stringent sensitivity reguirenents. The primary equipnent will resin located on the micrwave tcwer which is situated on a hill tcp a short distance northeast of the off gas stack (Weather Tower No. 2). The signals fran the censors will be digitized and transmitted to a ccmputer in the control rocn so that real time meteorology is available to operating personnel for environ-mental radiation dose assessnent. A backup weather tcwer is being installed to supply data in the event that the primary weather tcwer is inoperable. Any wind patterns caused by channeling or draining flow into the river valley will be nonitored by sensors installed on a transmission twer located in the river (River Tower). This data will be radio telemetered to the primary weather twer, then by cable to the control ramn. Supplemental data will be collected at Weather Tower IA located on the shoreline a short distance south of the generating staticn.
The location of the reather tcwers are shown on Figure 1.
Table 1 provides the specific types of sensors and their respective elevations above ground. All of the data will be re:orded on strip charts located in shelters at the base of tcwer 1A and tcwer 2 prior to being telemetered to the control room.
In the ccntrol room the data will be processed by a data logger to produce a continuous printout of 15 min. and 60 min.
averaged noteorological parameters. In addition, the real time data will be recorded on strip charts which are nounted in the neteorological data display panel in the control room. This systen provides sufficient redundancy to assure that the neteorological data required for dose assesment will be available should various corponents of the neteoro-logical monitoring system fail.
All of the neteorological data will be transnitted fran the ccuputer in the ccntrol room to a Nuclear Data ND6650 ccmputer located on the first floor of the Emergency Operations Facility / Technical Support Center located at Unit 1.
The data will then be accessible frca the EOF and TSC through CRP terminals and by the appecpriate federal and state agencies by means of telephone lines to the ND6650 ccmputer.
The primary Class A dose nodel for Pea'ch Bottczn will be run on the ND6650 ccmputer thereby making the required portions of the outpit available to outside agencies through the telephone remote interrogation hardware. A backup version of the Class A model is available on the PEOo corporate caiputer located in Philadelphia with access through a CRP terminal located in the EOF. The attached block diagra illustrates the planned systan (Figure 2).
The Class A dose assessment rodel is a straight line continuous point source Gaussian distribution nodel. This model was developed specifically for PBAPS and has the following capabilities:
1.
corrects effective plume height for site specific terrain 2.
calculates Vent Plune rise based on nodel developed by PBAPS Vent Plume Behavior Study 3.
can process doses for up to 300 receptor locations in each of 16 polar sectors radiating frm the point of release 4.
variable time step (optimum 15 min. )
5.
uses nodified Brookhaven turbulence classification 6.
downwash frm vent release is calculated 7.
X/O's and doses frm 3 simultaneous sources can be detemined when required 8.
calculates cross wind distance to 10% of plume centerline con-traticn 9.
calculates the following doses to 50 miles inhalaticn and ingestion a.
Iodine b.
Noble gas -
skin and whole body c.
Shine frm elevated plune (out to 10 miles) 10.
maintains and tpdates historical cumulative doses at all receptor locations in each of the 16 sectors frm the beginning of the release.
mZ/dg/3/4
TAEE 1:
PIANNED ELEVATIONS T ETEROIOGICAL SENSORS SENSOR ELEVATIO3 (grmnd)
'IOfER 1A 2 wind speed 30' & 92' 2 wind directim 30' & 92' 2 terperature 33' & 89' 1 rain gage 15' RIVER 'IOfER 1 wind spesi 55' 1 wind directicm 55' BAG UP POLE 1 wind speed 30' 1 wind directicn 30' TOfER 2 3 wind speed 30', 75', & 320' 3 wind directicn 20', 75', & 320' 3 terperature 30', 146', & 316' 1 dew point 30' 1 rain 5'
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