ML18139B890

Provides Info Resolving Remaining Outstanding Issues in Proposed Tech Specs for Auxiliary Bldg & Control Room Ventilation Sys,Per NRC & 820604 Meeting.Control Room Dose Calculations Encl

ML18139B890
Person / Time
Site:	Surry
Issue date:	06/07/1982
From:	Leasburg R VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	Harold Denton, Varga S Office of Nuclear Reactor Regulation
References
335, NUDOCS 8206110140
Download: ML18139B890 (47)

Text

,'~

VIRGINIA ELECTRlC AND POWER COMPANY RICHMOND,. VIRGINIA. 23261 R, H. LEASBURG VxcE PJ<ESIDENT NUCLEAR OPERATIONS June 7, 1982 Mr. Harold R. Denton, Director Office of Nuclear Reactor Regulation Attn:

Mr. Steven A. Varga, Chief Serial No. 335 NO/PSEC/EVF/jmj/SP3 Docket Nos. 50-280 Operating Reactors Branch No. 1 Division of Licensing 50-281 License Nos. DPR-32 DPR-37 U.S. Nuclear Regulatory Commission Washington, D.C.

20555 Gentlemen:

AUXILIARY VENTILATION SYSTEM MODIFICATION PROPOSED TECHNICAL SPECIFICATIONS SURRY POWER STATION - UNITS 1 AND 2 In response to your letter of May 24, 1982 and in accordance with discussions and agreements in a June 4, 1982 meeting with your staff, we are providing the following information which we feel resolves the remaining outstanding issues in our proposed Technical Specifications for the Auxiliary Building and Control Room Ventilation Systems at Surry Power Station.

1.

Auxiliary Building Ventilation System

a.

The acceptance value for the flow rate testing shall be 36,000 CFM +/-10 percent.

b.

The flow rate testing of each filter system shall be performed initially, after any structural maintenance on the HEPA filter or charcoal adsorb er housings, at least once per refueling cycle, and after each complete or partial replacement of the HEPA filters or charcoal adsorbers.

c.

The method for determining the air flow rate shall be in accordance with Section 9 of the ACGIH Industrial Ventilation document and Section 8 of ANSI N510-1975.

d.

The flow rate utilized during in-place cold DOP testing and in-place halogenated hydrocarbon leakage testing shall be 36,000 CFM +/-10 percent.

This flow rate should be verified utilizing the flow elements located in each Category I filter train fan discharge.

The as-installed accuracy of these flow elements is still under evaluation.

The results of our efforts will be forwarded for your review once they are available.

The calibration of the flow measurement system will fall under established station periodic calibration procedures.

e e

• VIRGINIA ELECTRIC AND POWER CciMPANY TO

2.

Control Room Air Filtration System

a.

The acceptance range of flows utilized during flow rate testing shall be 750 to llOO CFM.

We have enclosed (Enclosure I) copies of control room dose calculations that indicate the control room accident condition doses, when considering the above range of flows, to be within the limits of GDC-19.

b.

The flow rate utilized during in-place cold DOP testing and in-place halogenated hydrocarbon testing shall be the value determined during the system flow testing provided this value is within the acceptance range.

3.

Laboratory Acceptance Testing of Used Charcoal Adsorber

a.

For the auxiliary building ventilation system, the laboratory analysis of in-place charcoal samples shall show at least 96 percent methyl iodine removal at 0.125 second residence time, 1.75 +/- 0.25 mg/m3 inlet methyl iodine concentration, relative humidity equal to 80 +/- 3 percent, and an air temperature equal to 30 +/- 1°C.

The method of testing shall be in accordance with ASTM D3803.

Calculations providing justification for our position of utilizing 80 percent relative humidity in the laboratory testing of used charcoal will be transmitted once they have been released for distribution by our architect-engineer.

b.

For the control room air filtration system, the laboratory analysis of in-place charcoal samples shall show at least 96 percent methyl iodine removal at 0.125 second residence time, 1.75 +/- 0.25 mg/m3 inlet methyl iodine concentration, relative humidity equal to 95 +/- 3 percent, and an air temperature equal to 30 +/- 1°C.

The method of testing shall be in accordance with ASTM D3803.

Our justification for utilizing 96 percent iodine removal efficiency is based on the enclosed control room accident dose calculations (Enclosure I).

In those calculations, it was assumed the removal efficiency of the control room air filtration system charcoal adsorbers was 90 percent.

We feel testing the used charcoal at 96 percent with dose calculations based on 90 percent represents a sufficient factor of safety, It should be noted that the 95 percent iodine removal efficiency noted in item 2.e. of our letter of January 19, 1981 (Serial No. 036) concerning control room habitability was based on nominal FSAR values and was not the value utilized during control room dose calculations.

As previously stated, the value utilized during dose calculations was 90 percent.

e e

VIRGINIA ELECTRIC AND POWER CciMPANY TO We feel this resolves the remaining open items concerning the proposed Technical Specifications.

It must be realized any and all proposed changes to station Technical Specification must be reviewed and approved by the Station Nuclear Safety and Operation Committee and an independent review group prior to submission for NRC approval.

We anticipate our formal Technical Specification submittal taking place within 30 days of this letter.

Should you require additional information, please contact us.

Enclosure cc:

James P. O'Reilly, Regional Administrator U.S. Nuclear Regulatory Commission Region II Atlanta, GA 30303 Richard C. DeYoung, Director Office of Inspection and Enforcement Washington, D.C.

20555 Very truly yours,

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R. H. Leasburg

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Enclosure I CONTROL ROOM DOSE CALCULATIONS SURRY POWER STATION e

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e Enclosure I CONTROL ROOM DOSE CALCULATIONS SURRY POWER STATION e

ST. e. WEBSTER ENGINEERING CORPORATI

~ALCULATION TITLE PAGE

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STONE e. WEBSTER ENGINEERING CORPO~ION CALCULATION SHEET,

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-NE 8. WEBSTER ENGINEERING CORPO-ION CALCULATION SHEET CALCULATION IDENTIFICATION NUMBER

,J.O. OR W.O. NO.

/2 84-t.. /3 DIVISION 6 GROUP CALCULATION NO.

OPTIONAL TASK CODE PAGE

/(.)

NT If f' uR (.e)~o.r/-o

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,I () OR w.o. NO.

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CALCULATION IDENTIFICATION NUMBER DIVISION Et GROUP CALCULATION NO.

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TABLE 3-1 As.su.rmtions Used. i!l the LOCA Dose A::a!.zsis Povar Level Opereting Title Fractfo::i o-:: Core Inventory Available for Leakage Iodines

?iobla Ga.ses Initial Iodine Conposition in Conta.1.c:nent Eler::e::::i.tal.

Organic Po.rticulate Conta.in.~?nt Lea.k Rate 0-390 sec _. o -

I 070 se<:.

• 390 sec-l hr -. / 070 :1.et: -

.I hr After 1 hr Contaiil!!len~ Volu:ne Sprayed Fraction Unsprayed F:ractio~

2,490 Mwt 3 :,r 25_percent 100 percent 91 percent 4 percent 5 percent 0.1 perce~t per day 0.05 percent per day 0 percent per ds.y 0.. 73 0.27 A-I Cont&in::.ent Mixing Rate :Betw--een Spreyed and Unsprayed Volm:.e 2.0 unspreyed volu::es psr hour Contaim:ient Spray System Ma.xiI!lUI:1 El.e=ental Iodine Deconta.::ina.tion Factor Reo.oval Coefficients Eleoental Iodi:ie Particuiate Iodine Organic Iodine X/Q Values (seconds per cubic meter)

Exclusion Bounde.r-.r O~l hr Iov Po~ulation Zone 0-1 hr" 0-8 hr 8-24 br 24-96 hr 96-720 hr Effective Caustic Sp:-ay Initiation Delay 'r'~

Atl:4.cA mt,d:-

13 p59 100.

10 per bour o.45 per bour 0

O*seconds

e TAELE 3-2 Assu."':l'Otions Used in the ~CCS Leaka~a Anal~sis Pover Level Opera.ting Ti:i.e Fraction of Core Iodine Inventory in ContaimneLt Sump Volume o! Containrn:int Sump Wa.ter Sump Wa.ter Temperature Fraction o! Iodine Released.to Building Atmosphere from Recircula.tion Lee.ka.ge Filter Efficiency for Sa.feguard.s Area.

3 yr

• 50 percent 1.65 x 106 liters

< 212 :F

.1 90 percent Technic&l. Speci!ic~tion Leak Rates as Function ot Ti.I::.e r-Tillle Value in cc/hr

~5 min 5-20 min 20 min-30 days O*

964*.*.

~,800

'Note: Tvice technicaJ. specification leak rates vere used

• p60 A-2.

.e

,--~

i

~-

__ _)

?..~

~;_)

TABLE 3-4 Assu.."'mtions Used in Control Roon Ix>ses Volume Filter Efficiency Breathing rate for entire 30 days 2.23 X 105 CU tt 90 percent 3.47 x 10-4 m3/sec Unfiltered 8.Ild filtered inleakage as a !unction of time Filter~d 0-1 hr 0

Unfiltered 10 ctm 1 hr-30 days

• 2,000 ctm.

10 ctm.

LI

.200 cfm

., $100

~

~ ~o,.

Atmospheric dispersion t ~tg (seconds per cubic meters )

Unit l contai rm:ent to l control room intake Unit 2 conta.iilment to control roon inta.ke Ventilation vent to control room intake Operator occupancy !actors F&C";or 0-8 hr

~br 1

p62 8-24 hr 8-24 hr 1

1-4 davs l-4 days o.6 4-30 davs

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St~.-~0 -t-r: ~e~Q * ~

7

SeE E:. WEBSTER ENGINEERING CORPOR.

CALCULATION TITLE PAGE

• SEE INSTRUCTIONS ON REVERSE SIDE

.&.5010 64 !FRONT)

CLIENT 6 PROJECT \\JEFCa

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..i.C. vrt H.O. NO.

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-ONE e. WEBSTER ENGINEERING CORP.ION CALCULATION SHEET CALCULATION IDENTIFICATION NUMBER

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CALCULATION SHEET

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?ioble Gases Initial Iodine Conposition in Conta.ii:.:nent Elex:~ntal Organic Po.rticuJ.a te Contain.~=nt Leak Rate 0-390 sec -+ o - I 070.sec

• 390 sec-1 hr~ 1070 ~ec -

_I hr After 1 hr ContaiD!!lent Volu:ne Sprayed Fraction Unsprayed Fraction 2,490 M.rt 3 yr 25 percent 100 percent 91 percent 4 percent 5 ~cent 0.1 percent per day O. 05 :percent per day 0 percent per day 0.73 0.27 A-I_

Contain=ent Mixing Rate Between Spreyed and Unsprayed Voltl!:!e 2.0 unspreyed volumes per hour Containn~nt Spray System MaximUI:1 Ele:nental Iodine Deconta.tlnation Factor Reoova.l Coefficients Elenental Iodi:ie Particulate Iodine Organic Iodine X/Q Values (seconds per cubic meter)

Exclusion Boundar-J 0.:.1 hr Lov Population Zone 0-1 hr' 0-8 hr 8-24 hr 24-96 br 96-720 hr Ef£ective Caustic Spray Initiation Delay Ti-l:le.,,

lttf::4.e.h me~ 13 p59 100.

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3 yr

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TABLE 3-4

• AssU!lmtions Used in Control ?.oon Doses Volume.

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