ML20126E178

Approves Util 731002 Proposed Change 40,permitting Temporary Increase in Alarm Setpoints on Two Radiation Detectors on Refueling Deck

ML20126E178
Person / Time
Site:	Big Rock Point File:Consumers Energy icon.png
Issue date:	02/26/1974
From:	Skovholt D US ATOMIC ENERGY COMMISSION (AEC)
To:	Sewell R CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
References
NUDOCS 8101120453
Download: ML20126E178 (3)

Text

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I FEB 2 61974

. Docket Ib. 5&l55 Constant Power Co@'any ATIth Mr. Ralph B, Sewell Nuclear Licensing Adcdnistrator '

212 West Michigan Avenue Jackson, Michigan 49201 Chance Ib. 40 Genthmen: License No. IPH-6 Your letter dated October 2,1973, aquested execption from the mquimments of Section 70.24 of 10 CIE Part 70 which would permit you to temorarily raise the alarm set points cr1 the two radiation detectors on the afueling deck of the Big Rock Point Nuclear Plant. Subparagraph (d) of Section 70.24 allows the licensee to apply to the Cocrd.ssion for such an exenption.

Since Section 6.4.2(b) of the Technical Specifications for Facility Operating License No. DPR-6 incorporate requirecents mlated to 10 CPR 70, we are granting your request for exenption and appmpriately changing the Technical Specificatims.

You have stated that background levels in the vicinity of these umitars occasionally exceed 20 mR/hr, the reimn set point allowed by the r6gulation. You propose to inplement administrative controls which will tegnrarily allow you to:

1. Incmase the alarm set points to levels above those expected during the transfer of Interials near the 'onitors which are expected to produce g;mma fields gmater . nan or equal to 20 mR/hr.

2. Incmase the alam set points to levels of 10 mR/hr gmater than background for periods of tine when the fuel pool or other tenporarily ston d material causes backgrt e d levels to be smater than or equal to 20 mR/hr.

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' .i Consumrs Power Company FEB 2 61974 The instru:nentation in question serve the dual function of area radiation monitors and local criticality alarms. he purpose of the monitoring requirements in Section 70.24, 10 CFR Part 70, is strictly to alert personnel to an accidental criticality. We Co:: mission is aware that the current regulations may inpose excessive restrictions in areas of high radiation background. Proposed amendments to Section 70.24 are under consideration which would eliminate the present specific alarm set point and detector distance requirements and allow licensees to choose values which suit their particular situations as long as the overall detection criterion is met. This would assure 1:rediate de-tection of the minimum accidental criticality specified in the regulations and concurrently minimize undesirable false alarms.

We have, therefore, concluded that in regard to the criticality alarm function of these instru: rents, the alarm set points ray be raised above 20 mR/hr as long as the overall detection criterion is satisfied.

However, since these instrumnts also serve as area radiation monitors, the alarm set points must continue to comply with the requirements of Section 6.4.3(e) of your Technical Specifications which limit the trip point settings to approxirately twice the normal raximum indicated level.

For this purpose, the nomal raxirri indicated level is the expected level under .;r".nl conditior.s prevailirs at the tim- .

> aced x r .a he '; sijerati:rs, . have c:r.21cde 1 th2t 1:re is

eat. r. 1 acc rcrae -;.n; the h n_sn aJ safecc/ uf .ne puolic will n::

La r.1_..~; . Cl. O' .e r: CI G 'i in the L.T_.tr propC@cJ3 'iOJ that ef.:.J.ti'f 0.ct s.m:lfle-1 exe..gcions irca requiren._r.ts of Ge twn 10..N uf M C/n Part

/C is nuu crized W. .. 2 d will no. :ndar.g:.e life or prg ar:y er the oc m n jefense and serr ity aM is other,tice in the public interest.

Since coth functions served by this ronitor-criticality alarm and area ra.11ation =nitor-continue to be adequately perfomed with the chargd settings, we have con 21uded that this change does not present a sig11fl23r.t ha m do cor.ciderdtion.

Accor:ingly, pursuant to Section 50.59 of 10 CFR Part 50, paragraph 6.4.2(b) of the Technical Specifications for Facility Operating License Ho. DPR-o is hereby cie.nged to add the following sentence to the end of the paragrer.h:

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. # Distribution 9 l Docket File AEC PDR Coretters Pwer Camarv -

3- Branch Reading FEB 2 61974 RP Reading

" "ttowever, notwithstanding the mquirernents of Section 70.24(a)(1),

alam settings rgy be raised above 20 mVhr as.lang as the overall detection criterion in Section 70.24(a)(1) is satisfied and the requimments specified in paragmph 6.4 3(e) below am met."

Sincemly, JRBuchanan TBAbernathy EPA (3) '

DJSkovholt h) ACRS (16)

Donald J. Skovholt R0 (3)

OGC Assistant Director forOperatingEeactoNf Zi*"*""

Directomte of Licensing cc: Mr'. Pr.ul A. Perry, Secmtary Charles E. Bayless Cons'ners Power Car:pary Of Counsel Consumers Power Co@ag fr. Donald Aldrich Consumers Power Cmpany cc w/cy of CPC's 10/2/73 ltr:

(w/oe.rtified copy) Mr. lians L. Harrester (2)

A71N: Joan Sause Peter W. Steketee, Esquire Office of Padiation Protyar:s j  ;

Vaner Veen, Fmihofer & Cook Environmental Protection Agency 7 Union Bank Building, Suite 950 647A East Twers, Waterside Fall N Grand Tupids, Micnigan 49502 401 M btreet, N. W.

Washington, D. C. 20460 $

George C. Fatman, Jr., Esquin v

y Hunton, W1111me, Gay & Gibson Mr. Gary Williams 700 East Pain St met Federal Activities Branch Envimnnental Pmtection Aeency h.i Rictrond, Virginia 23212 .

c 1 N. Wacker Drive f David S. Brollier, Esquim Chicago, Illinois 60606 Httiton, Williams, Gay & Gibson / '

TJCarter 700 East Fain Stmet NDube Richmond, Virignia 23212 y MJinks (4) ,

Mr. Ronald C. Callen RMDiggs ,

Michigan Public, Service Conmission JJShea Jd Law Building JSapir ]

Lansing, Michigan 48913 PCollins f ,

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- Constrem Power CTpany f The instrtmentation in qtestion serve the dual function of ama rudiaticn ',

nmitos and local criticality alarre. 'Ibe purpose of the monitoring -

requimrents in Section 70.24, 10 CFR Part 70, ;is strictly to alert '

personnel to an accidental criticality. Le Ccomission is swam that the curmnt mgulations may drpose excessive matrictions in areas of high radiation background. Proposed arendrents to Section 70.24 are t.7. der consideration which would elirdnate tln pmsent specific alam set point and detector distance mquirements and allow licensees to choose valtes which suit their particular situations as long as the overall detection criterion is met. 'Ihis would assum innediate detection of the mininun accidental criticality specified in the regulations and concurrently minimize undesirable false alame.

We have, themfom, concluded that in regard to the criticality alam function of these instruments, the alarm set points may be raised above 20 mPAir as long as the overall detection criterion is satisfied.

Howver, since these instrutents also serve as area radiation monitors, the alarm set points must continte to conply with the mquiremnts of Section 6.4.3(e) of your Technical Specifications which lin:it the trip point settings to approximately twice the nornal Me indicated level.

In this case the romal rnximum indicated level can be interpmted to be

- the expected level under conditions prevailing at the tire. .

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s Based on the above considerations, w have concluded that there is reasonable assurance that the health and safety of the public will not ( ; W"'

oe endan end by operation in the ranner prt> posed, and that granting the V specified exenptions frcn mquirerents of Section 70.24 of 10 CFR Part &',

70 is authorized by law and will not endanger life or property or the corron defense and security and is otheIvise in the public interest. /

h /A W'e also have concluded that this change does not present a significant f N#

hazards consicbration, \ ':p/4.1 i

/ :,,, , 4 Accordingly, pursuant to Section 50 59 of 10 CFR Part 50, paragraph i '; v ',<

6.4.2(b) of the Technical Specifications for Facility Operating License } p, f ,,,

No. DFB-6 is hereby changed to add the following sentence to the end of ( ,. .

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jg Distribution Docket File Constrers Power Coupaw -

3- AEC PDR Branch Reading RP Reading i jg % l.,?,t,4 "Howeverhoontrary-to-the curdaquiremnts of Section 70.24(a)(1), 4 alann settings may be raised abow 20 mR/hr as long as the overall ' '"'

detection criterion in Section 70.24(a)(1) is satisfied and the ' '

m-mquiremnts specified in para 6raph 6.4.3(e) below am met." ,

JRBuchanan Since aly, TEAbernathy EPA (3) '

DISkovholt ACRS (16)

Donald J. Skovbolt RD (3)

MC Assistant Director D W emann far Operating Reactors T.ICarter Dimetomte of Licensing NDube cc: It. Paul A. Perry, Secretary = David S. Brollier, Esquin Constrers Power Corpaq -Hinton, Williams, Gay & Gibson 212 West Michigan Awnue 700 East Main Stmet Jackson, Michigan 49201 Richmond, Virginia 23212 Charles E. Bhyless Mr. Donald Aldrich Consumrs Power Corrpaq Of Counsel ,

212 West Michigan Avenue Constrers Power Carpany Jackson, Michipn 49201 212 West Michigan Avenue Jackson, Michigan 4920' '

Peter W. Steketee, Esquim l Vander Veen, Frelhofer & Cook oc or/ copy of.CPC's 10/2/73:

Union Bank Building, Suite 950 Fr. Hans L. Harester Grand Rapids, Michigan 49502 ATDi: Joan Cause  !

Office of Radiation Prt>grarre -

i Mr. Karl Waldner Ehvimnrental Pmtection Agency i 647A East Towers, Waterside Mall Dox 1365 401 M Street, S. W.

Soyne City, Michigan 49712 Washington, D. C. 20460 M3. Clam W. Freer  !>. Gary W1111ans 3513 Fiesta Ians Kalanazoo, Michigan 49008 Federal Activities Branch Environmental Pmtecticn Agency George C. Ihemen, Jr., Esquim 1 N. Wacker Drive Hunton, W111hs, Gay & Gibson Chicago, Illinois 60606 700 East Pain Stmet MIinks (4) r Richcona, Virginia 23212 RMDiggs BScharf(15)

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\ UNITED STATES S% - . ATOMIC ENERGY COMMISSION

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WASHINGTON. D.C. 20545 1

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r Constre.rs Power Cccpany. '

NITI: Mr. Ralph B. Sewell i Nuclear Licensing Ad=inistrator 212 West Michigan Avenue Jackscn, Michigan 49201 Change No. 40 Gentlemn: License No. DPR-6 i Your letter dated October 2,1973, requested exe ption frem the requiremnts -  ;

of Sec-ion 70.24 of 10 CFR Part 70 which would pe:=!.t you to terporarily raise the ala:n set points on the two radiation detectors on the refueling deck of the Big Rock Point Nuclear Plant. Subparagmph (d) of Section 70.24-allows the licensee to apply to the Corr:ission for such an execption. <

Since Section 6.4.2(b) of the Technical Specifications for Facility Operating' License No. DPR-6 incorporate requirements m1ated to 10 CFR 70, we are pting your request for exerption and appropriately changing the Technical

. Specifications.

You have stated tnat background levels in the vicinity of these ronitors occasionally exceed 20 rWhr, the nnxirr:1 set point allowed by the regulation. You propose to inplement administrative controls which will

• terporarily allow you to: ,

1. Increase the alam set points to levels above those expected I during the transfer of materia's near the renitors which are expected to produce gama fields gmater than or equal to 20 rWhr. i 1

2. Increase the a2am set points to levels of 10 rP/nr gmater ,

than background for periods of time when the fuel pool or other te pc.~rily stored raterial causes background levels to be greater than or equal to 20 rF/nr. +

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