ML14188B768

Summary of 810223 Meeting W/Util Re Criteria for Providing Alert & Notification Sys for Facilities.List of Attendees & Util Slide Presentation Encl

ML14188B768
Person / Time
Site:	Robinson, Brunswick
Issue date:	03/23/1981
From:	Neighbors D Office of Nuclear Reactor Regulation
To:	Office of Nuclear Reactor Regulation
References
NUDOCS 8104020099
Download: ML14188B768 (19)

Text

(OR 2 3 Docket No. 50-261 50-325/324 0

LICENSEE: Carolina Power & Light Company FACILITY: H. B. Robinson Steam Electric Plant, Unit No. 2 Brunswick Steam Electric Plant, Unit Nos. 1 & 2

SUMMARY

OF MEETING HELD ON FEBRUARY 23, 1981, WITH CAROLINA POWER & LIGHT COMPANY The subject meeting was held at CP&L's request to discuss criteria for providing an alert and notification system for Robinson and Brunswick.

Since this meeting was part of the agenda for an NRC/FEMA meeting, it provided the NRC/FEMA an opportunity to see a utility approach to meeting 10 CFR,50,- Appendix E.

A list of attendees is attached.

CP&L's presentation (attached) indicated that CP&L intends to conform to the requirements of the new rule but wanted clarification of the require ments pertaining to siren systems.

NUREG-0654/FEMA-REP-1, Rev. 1, identifies that an attentuation factor of lOUB loss per doubling distance be used to determine siren range and references the FEMA publication,,"Outdoor Warning System Guide", CPG-1-17 as containing the design criteria for siren systems.

CP&L contends that 7.5dB attentuation per doubling distance is adequate and by using 7.5dB, a significant cost savings could be realized.

FEMA stated that this approach would require some consideration on its part but the final proof of the system would be a test of the system in place (i.e., a survey of the population to determine if the signals can be heard).

Don Neighbors, Project Manager Operating Reactors Branch #1 Division of Licensing

Enclosure:

List of Attendees CP&L Presentation DISTRIBU 10N Dockets ORB#1 Rdg NRC PDR CParrish LOCAL PDR SVarga 8104020099 SURNAME)

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8-32. 824 NRCFOM 18 0/0)NRC 040OFFICIAL RECORD COPY NUSGPO: 1980-329-824

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3. A. Jones Carolina Power and Light Company cc:

G. F. Trowbridge, Esquire Shaw, Pittman, Potts and Trowbridoe 1800 M Street, A'.W.

Washington, D. C.

20036 Hartsville Memorial Library Home and Fifth Avenues Hartsville, South Carolina 29550

-U. S. Nuclear Regulatory Commission Resident Inspector's Office H. B. Robinson Steam Electric Plant Route 5, Box 266-1A Hartsville, South Carolina 29550 Michael C. Farrar, Chairman Atomic Safety and Licensing Appeal Board Panel U. S. Nuclear Regulatory Commission ashington, D. C.

20555 Richard S. Salzman Atomic Safety and Licensing Appeal Board Panel U. S. Nuclear Regulatory Commission ashingt.on, D. C. 20555 Dr. W. Reed Johnson Atomic Safety and Licensing Appeal Board Panel U. S. Nuclear Regulatory Commission

ashi ngton, D. C. 20555

ENCLOSURE LIST OF ATTENDEES 02/23/81 NRC D. Neighbors S. Schwartz T. Kevern J. Hannon B. Grimes F. Pagano FEMA J. Dickey H. Gaut R. Jaske CP&L R. Coats S. Zimmerman D. Waters NUTECH (CP&L's consultant)

M. Stern M. Mlynezak

ENCLOSURE 10 CFR 50 APPENDIX E AMENDED 8/1/80 REQUIRES:

THE LICENSEE DEMONSTRATE THAT THE MEANS TO PROMPTLY ALERT AND PROVIDE INSTRUCTIONS TO THE PUBLIC EXISTS.

• PROMPT NOTIFICATION IS TO BE ESSENTIALLY COMPLETE WITHIN 15 MINUTES OF THE DECISION TO NOTIFY THE PUBLIC.

THE REQUIREMENTS CAN ONLY BE SATISFIED BY INSTALLED EQUIPMENT WHICH CAN BE ACTIVATED WITHIN MINUTES.

CP&L INTENDS TO CONFORM TO THE REQUIREMENTS OF THE NEW RULE AND DESIRES TO ASSURE THAT PRIOR TO SIGNIFICANT INVESTMENT, AN UNDERSTANDING OF ALL THE STAFF CRITERIA FOR NOTIFICATION EXIST SUCH THAT THE MOST COST EFFECTIVE SYSTEM IS EMPLOYED,

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DESIGN CRITERIA 10dB DIFFERENTIAL ABOVE OUTSIDE BACKGROUND AMBIENT IS REQUIRED FOR NOTIFICATION

• AMBIENT BACKGROUND IS DEFINED AS WEEKDAY DAYTIME AVERAGE AS MEASURED BY SOUND SURVEY OR HANDBOOK VALUES

• FOR POPULATION DENSITY OF BELOW 2000 PEOPLE PER SQUARE MILE 50 dB(A) IS A CONSERVATIVE ESTIMATE OF BACKGROUND AMBIENT SOUND LEVEL e

10 dB ATTENTUATION PER DOUBLING DISTANCE e

SOUND LEVEL, LESS THAN 123 dB(A) AT ALL LOCATIONS BELOW 8 FT. ELEVATION

THE 10dB DISSONANT DIFFERENTIAL IS A CONSERVATIVE USE OF THE 9dB DIFFERENTIAL WHICH IS DISCUSSED IN FEMA DOCUMENT CPG-1-17. RESEARCH HAS SHOWN THAT A PERSON IS CAPABLE OF BEING ALERTED BY SUCH A DIFFERENTIAL ABOVE OR BEL THE BACKGROUND AMBIENT IN THE CASE OF A PREDOMINANTLY NARROW BAND 300 TO 800 HZ EMITTED BY LARGE SIRENS. THE ACHIEVEMENT OF POSITIVE DIFFERENTIAL OF 10dB HAS BEEN A BASIC OBJECTIVE (ALTHOUGH NOT ALWAYS ATTAINED) OF A WIDE RANGE CIVIL DEFENSE SYSTEM.

BACKGROUND dB SHOULD. BE DETERMINED IN A BAND ABOUT THE SIREN SIGNAL FREQUENCY.

INCLUSION OF BACKGROUND NOISE ENERGY FROM OUTSIDE THIS BAND COULD BE MIS LEADING.

THE 10dB DIFFERENTIAL ABOVE DAYTIME AMBIENT IS MEANT TO PROVIDE A DISTINGUISHABLE SIGNAL INSIDE OF AVERAGE RESIDENTIAL CONSTRUCTION UNDER AVERAGE CONDITIONS.

50dB(A) IS A CONSERVATIVE ESTIMATE OF THE AVERAGE DAYTIME AMBIENT IN AREAS WITH POPU LATION BELOW 2000 PERSONS/SQUARE MILE.

FOR ORGANIZATIONS PROPOSING SYSTEMS WITHOUT FIELD SURVEYS, THE FOLLOWING REQUIREMENTS APPLY:

THAT FIGURE 1 OF CPG-1-17, "OUTDOOR WARNING SYSTEMS GUIDE" PUBLISHED BY FEMA, BE USED AS THE DESIGN CRITERION FOR SIREN SYSTEMS IN AREAS WITH POPU LATION DENSITIES ABOVE 2000 PERSONS/MI FOR AREAS WITH POPULATION DENSITIES BELOW 2000 PERSONS/MI THE SIREN SYSTEM MUST BE DESIGNED TO PRODUCE A MINI MUM OF 60dB(C).

AN ATTENTUATION FACTOR OF 10dB LOSS PER DISTANCE DOUBLED SHOULD BE USED TO DETERMINE SIREN RANGE IN THE ABSENCE OF SPECIAL GEOGRAPHICAL FEATURES.

FIGURE 1 OF CPG-1-17, "OUTDOOR WARNING SYSTEM GUIDE,"

SHOULD BE USED AS.THE DESIGN CRITERION FOR SIREN SYSTEMS IN AREAS WITH POPULATION DENSITIES ABOVE 2000 PERSONS/MI2

THE SIREN SIGNAL SHALL BE A 3 TO 5 MINUTE STEADY SIGNAL AS DESCRIBED IN PARAGRAPH IV OF CPG-1-17 AND CAPABLE OF REPETITION.

CPG-1-17 PARAGRAPH IV-E

• AIN~lIoNQ 18 RL wARfgit TH1IS IS A 3 TO 5 MINUTE STEADY SIGNAL FROM SIRENS, HORNS, OR OTHER DEVICES, THIS SIGNAL MAY BE USED AS AUTHORIZED BY LOCAL GOVERNMENT OFFICIALS TO ALERT, THE PUBLIC TO PEACETIME EMERGENCIES.

IN ADDITION TO ANY OTHER MEANING OR REQUIRE MENT FOR ACTION AS DETERMINED BY LOCAL GOVERN MENT OFFICIALS, THE ATTENTION OR ALERT SIGNAL SHALL MEAN TO ALL PERSONS IN THE UNITED STATES, "TURN ON RADIO OR TV.

LISTEN FOR ESSENTIAL EMERGENCY INFORMATION."

DETERMINATION OF SIREN RANGE LOW POPULATION z,2000 PEOPLE/MI2 (dB RATED -

60dB)

R.= 100x2 1dB MEDIUM POPULATION

<2000 PEOPLE/MI 2 (NO HIGH RISE BUILDINGS)

FIGURE 1 OF CPG-1-17

FIGURE 1 OF CPG-1-17.

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dBDI io7-7 7:4I 90 100 110 12.0 130 1'40 RATED OUTPUT AT lOO FrT. IN dB(c)

FIGURE 1 OF CPG-1-17 MINIMUM RANGE SLOPE FOR SUBURBAN AREAS IS l0dB/DIS. x 2 FOR HIGH INTENSITY SIRENS (?>110ds) SLOPE Is 7.5dB/DIs. x 2 INTERCEPT CALCULATION INDICATES THAT 70 dB IS SOUND LEVEL FOR NOTIFICATION WHICH IS APPROPRIATE FOR IN CITIES NOTE:

60 dB IS ALERT LEVEL FOR RURAL AREAS ABOUT POWER PLANT

.10 11 S AVAILABLE FOR ADDITIONAL RANGE

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IF CP-1-17 FIGURE 1 APPROACH IS EMPLOYED AND 60dB ALERT LEVEL IS EMPLOYED RATHER THAN 70dB FOR 130dB SIREN:

70-60 CONSERVATIVE RANGE = 8900 x 2 10 FROM FIGURE 1

RANGE = 17,800 FEET OR 70-60 RANGE =8900 x 2 7,5 RANGE = 22426 FEET OR 4.2 MILES

RAG.E.C I E I LL I

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.7 APPRED OPRITE IIU ANG PER CRIER.

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APPROPRIATE CREDIT IF 10 dB REDUCTION IN I

NOTIFICATION IS APPLIEDr AT 7.5 dB/ DIS, X 2

10.

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RATED OUTPUT dB AT 100 FT.

I or 127 dB Rated Unit Range It.

Area mi.

Relative Cost CP-1-17 6800 5.21 2.33 OdB/dis.X..2 10400 12.19 1.0 CP-1-17 plus 13600 20.83 0.585 credit for 10dB at lOdB/dis.X 2 CP-1-17 plus 17100 32.83 0.370 credit for 10dB a-7.5dB/dis.X 2 Note!

The credit improves as the rated output of the unit increases for a 130dB unit the relative cost for the credit cases above are 0.541 and 0.326.

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