ML19312B885

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Proposed Tech Specs 1.8,1.9,3.13,3.14 & 4.1 Re Limits on Reactor Coolant & Secondary Coolant Iodine Activities to Maintain Dose Rates from Postulated Accidents Below Limits
ML19312B885
Person / Time
Site: Oconee  Duke Energy icon.png
Issue date: 07/08/1977
From:
DUKE POWER CO.
To:
Shared Package
ML19312B879 List:
References
NUDOCS 7911250076
Download: ML19312B885 (8)


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, 1.*8 DOSE EQUIVALENT - I-131 The Dose Equivalent I-131 shall be that concentration of I-131 (uci/ gram) which alone would produce the same thyroid dose as the cuantity and isotopic mixture of I-131, I-132, I-133, I-134 and I-135 actually present. The thyroid dose conversion factors used for this calculation shall be those listed in Table III of TID-14844, " Calculation of Distance Factors for Power and Test Reactor Sites".

1.9 5 - AVERAGE DISINTEGRATION ENERGY the 5 Average Disintegration Energy shall be the average (weighted in proportion to the concentration of each radionuclide in the reactor coolant at the time of sampling) of the sum of the average beta and ga==a energies per disintegration (in MEV) for isotopes, other than iodines, with half lives greater than 15 minutes, making up at least 95% of the total non-iodine activity in the coolant.

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I 191125007b l-5 i

3.1. 4,

Reactor Coolant Svstem Activity Soecification 3.1.4.1 The specific activity of the reactor coolant system shall not exceed 3.5 pCi/ gram dose equivalent I-131 except as provided in Specification 3.1.4.2.

3.1.4.2 If the specific activity of the reactor coolant system is greater than 3.5 uCi/ gram but less than 60 uCi/ gram dose equivalent I-131, power operation =ay continue for periods of 96 hours0.00111 days <br />0.0267 hours <br />1.587302e-4 weeks <br />3.6528e-5 months <br />.

3.1.4.3 The specific activity of the ?.eactor Coolant System shall not exceed 311/E uC1/ gram.

3.1.4.4 If the conditions of Specifications 3.1.4.2 or 3.1.4.3 are not met, the reactor shallbe in a hot shutdown condition within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />.

A reportable occurrence shall be submitted to the Commission pursuant to Specification 6.6.2.1.b and shall contain the following information:

a.

Reactor power history starting 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> prior to the first sample in which the limit was exceeded.

b.

Fuel burnup by core region

~

Cleanup flow history starting 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> prior to the first c.

sample in which the limit was exceeded d.

History of degassing operations, if any, starting 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> i

prior to the first sample in which the limit was exceeded The time duration when the specific activity of the reactor _

e.

coolant exceeded 3.3 uCi/gres dose equivalent I-131 or 311/E uCi/ gram.

Bases The limitations on the specific activity of the reactor coolant ensure that the resulting 2 hour2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> doses at the site boundary will not exceed an appropriate fraction of the Part 100 limits following a steam generator tube rupture accident. The steam generator tube rupture was~ analyzed as a separate accident and in conjunction with a steam line break accident.

The analyses considered the effects of the " iodine spike" associated with the accident transient and also considered the compounding effects of a preexisting iodine spike caused by seme prior transient.

The following lodine spiking model, empirically developed from operating data, was used to calculate the curies of iodine entering the secondary system after the tube rupture:

3.1-4

~ ( i+1 i} + C0(f )(fo) e~

i+1(1-e- ( i+1~ i)

~

~

-C

=C e

g41 where:

C

= I-131 activity in the reactor coolant at time e, uC1/ gram 1

g time after start of accident, min.

t

=

g L, = total removal rate of-I-131, min ~

R

= release rate of I-131 into the reactor coolant, Ci/ min.

A

= radioactive decay constant for I-131, min ~

C*

= steady state I-131 concentration prior to transient =3.5 uCi/ gram L*

steady state removal rate of I-131, prior to transient

=

= 6.85 x 10-4 min-1 R*

steady state release rate of I-131 into the reactor coolant,

=

C1/ min Time After Transien't Hours Spiking Factor (ti)

(R/R*)

0-1 127 1-2 47 2-3 16 3-4 6

4-5 2.3 For the case of a preexisting iodine spike, the curies of iodine entering the secondary system were based on Ci at the time of the tube rupture (ti=0) being 60 uCi/ gram dose equivalent I-131.

An accident must occur in a very small " time window" following a power transient for the iodine concentration to be at 60 uC1/ gram since this high concentration exists for only a rela-tively short period of time following a transient.

The primary to secondary e

leak rate associated with a double-ended steam generator tube rupture accident was conservatively assumed to be a constant 435 gpm (43.6 lbs/sec).

All of the noble gas activity and 10% of the iodine activity in the leakage entering the secondary system is assumed to be present in the steam = ass release to the environment. Also assumed to be released to the environment is the iodine activity in 173,300 lbs of secondary coolant containing 0.1 uCi/ gram of dose equivalent I-131 (the maximum value per Tech Spec 3.13) and the iodine and noble gas activity-associated with a primary to secondary leak rate of 1 g;m (the maximum leak rate permitted per Tech Spec 3.1.6)'.

3.1-5

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The site boundary doses were based on the zero to two-hour dispersion (X/Q), of 1.16 x 10-E (ec/m3 (per Section 2.3.2 of the FSAR).

factor at the site-boundarv 1609 m) corresponding to a ground release, s

The i.e.,

dose calculations are_ consistent with TID-14844, except for the conserva-tive assumption that E used to calculate the whole body dose includes both the beta and ga=ma energy whereas TID-14844, Reg. Guides 1.4,1.24, 1.25, and 1.77 only consider the ga=ma energy in calculating the whole body dose.

The resulting doses are:

2 Hour Site Boundarv Doses (Rem)

Thyroid Whole Body i

Steam Generator Tube Rupture with 2.8 0.34 Iodine Spike Steam Generator Tube Rupture with 14.0 0.86 Steam Line 3reak and Iodine Spike Steam Generator Tube Rupture with 16.1 0.34 Preexisting Iodine Spike i

Steam Generator Tube Rupture with 46.7 0.86 Steam Line 3reak and Preexisting Iodine Spike Power operation for time periods with the reactor coolant's specific activity > 3.3 uCi/ gram dose equivalent I-131, but less than 60 uCi/ gram dose equivalent I-131, acccmodates possible iodine spiking phenomenon whieb may occur following changes in thermal power.

Operation with specific activity levels exceeding 3.5 uCi/ gram dose equivalent I-131 but within the 60 uCi/ gram dose equivalent I-131 limit is restricted to periods not to exceed 96 hours0.00111 days <br />0.0267 hours <br />1.587302e-4 weeks <br />3.6528e-5 months <br /> since these activity levels increase the l

2 hour2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> thyroid dose at the site boundary by a factor of 3 to 6 following a postulated steam generator tube rupture.

Reducing Tavg to < 5300F prevents the release of activity in the event of a steam generator tube rupture since the saturation pressure of the reactot coolant is below the lift pressure of the atmospheric steam relief valves.

The surveillance requirements provide adequate assurance that excessive specific activity levels in the reactor coolant will be detected in sufficient time to take corrective action.

The information reported relative to iodine spiking will help to assess the parameters associated

.tth spiking phenomena. A reduction in frequency of isotopic analyses following power changes =ay be permissible when justified by. the data obtained.

3.1-6

3.13 SECONDARY SYSTCt ACTIVITY 1

Applicability Applies 'to the limiting conditions of secondary system activity for operation of the reactor.

Objective To limit the maximum secondary system activity.

Specification 3.13.1 The specific activity of.the secondary coolant system shall not exceed 0.10 uct/ gram dose equivalent I-131.

3.13.2 If the secondary coolant system specific activity exceeds 0.10 uCi/ gram dose equivalent I-131, the reactor shall be placed in a hot shutdown condition within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in a cold shutdown condition within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.

Bases The limitations on secondary system specific activity ensure that the resultant offsite radiation dose will be limited to a small fraction of 10CFR100 limits in the eyent of a steam line rupture.

This dose includes the effhets of a coincident 1.0 gpm primary to secondary tube leak in the steam generator of the affected steam line.

These values are consistent with the assumptions used in the safety analyses.

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3.13-1 n

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l TAlli.E 4.1-3

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MINIMtJM SAMPLING FREQtIENCY Item Check Frequency

<l-1.

Reactor Coolant a.

Canuna Isotopic Analysis a.

Monthly

  • l h.

Itadlochemical Analysis for Sr 89, 90 h.

Monthly

  • a C.

Tritium c.

Monthly

  • i d.

Cross lieta or Cross Canuna Activity (1) d.

S times / week

  • Chemistry (C1, F and,02) e.

S times / week

  • g e.

f.

lloron Concentration f.

2 times / week **

g.

Cross Alpha Activity g.

Monthly

  • h.

E Determination (2) h.

Semi-annually *

  • j 1.

luotopic Analysis for I-131 1.

5 times / week

  • j.

Isotopic Analysis for Dose E<1uivalent J.

Once per 14 days

  • l-131 k.

Isotopic Analysis for Iodine Including k.

See note (3)*

I-131, I-133 and 1-135 2.

llorated Water Storage Iloron Concentration Weekly

  • and after each makeup y

Tank Water Sample IWo 3.

Core Flooding Tank lloron Concentra t ion Monthly

  • and after each makeup 4.

Spent Fuel Pool Water lloron Concentration Monthly *** and af ter each makeup 5.

Secondary Coolant a.

Isotopic Analysis for Dose Equivalent a.

Weekly

Concentrated Iloric Acid lloron Concentration Twice Weekly

  • Tank.
  • Not Applicable.if reactor is in a cold si.utdown condition for a period exceeding the sampling frequency.
    • Applicable only when fuel is.in the reactor.
      • Applicably only when fuel is in wet storage in the spent fuel pool.

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i TAlli.E 4.1-3 ConL.

ft_I N I ff U 11 S A H P I. I N C F it E Q U E N C Y Sensitivit y of Waste i

item Check Freilnency Analysis In I. ale

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-7.

1.uw Activity Waste

-a.

Canuna Isotopic Analysis

a. Prio.r to release
a. Canuna tincliiles <5x10 I*

5 Tank, Conilensate incluit ing Dissolveil of each l>atcli Dissolveil Cases <10 pC1/mi Test Tank, Hols le Cases Conilensate

_g Honitoring Tank, 13. Rattlochemical Analysis li. Monthly

b. <10 pCi/mi

.s 1.rnnul ry-Ilo t Sr 89,90 Shower Tank

< 10 ~5 pCl/mi

c. Tritium
c. tionthly c.

al. Cross Al pha Ac t-I vi t-y al. Monthly 31. <10' pCl/ml

<10_4 pCi/cc (gases)

8. Waste Gas Decay a.

Camma luotopic Analysis a.

Prior to release a.

gg Tank.

of each liatch

<10 pC1/cc (particulates anti l otlines)

h. Tritium
h. Prior to release b.

<10~

pct /cc of each batch

9. Unit Vent Sampling a.

Io<line Spectrum

a. Weekly a.

<10~

pCl/cc l

h. Particulates 1
1) Canana luotopic Analysis
1) Weekly Composite
1) <10 pC1/cc
2) Cross Alpha Activity
2) Quarterly on a
2) <10

pCi/cc sample of one week luration

3) Raillochemical Analysis
3) Quarterly Composite
3) <10 pCl/cc Sr 119,90 h

i TAltl.E 4.1-3 Cont.

} -

H IN IHUM S A H p 1. I f3 C F lt E Q II E f3 C Y i

Sensitivity of Waste Item Check Frequency Analysis in I.ab

c. Cases by Canuua Isotopic
c. Weekly
c. <10 ' pCl/cc Analysis
10. Keowee flydro Dam Heasure f.eakage Flod Rate Annually

. Dilution Flow I1.-Condenser Alr Ejector Heasure lodine parLitinn One time if and when primary partition Fac t o r Fac t o r in Condenser to seconlary leaks develop

)

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'12. Reactor lluilding

a. Ga nuna Isot.opic Analysis a.

Each purge a.

<10 pci/cc (gases)

-10

<10 pCi/cc (particulates and fodines)

b. TritInm
h. Each I' urge b.

<10-pcl/cc

.s (1)

When radioact ivit y level is e,reater than 10 percent of the limits of Specification 3.1.4, the sampling frequency shall'he increased to a minimum of once each day.

(2)

E determination will be started when gross beta or gross ganuna activity analysis indicates greater,than 10 pC1/ml and will be redetermined for each 10 pCf /ml increase in gross beta or gross gamma activity analysis thereafter.

(3) The isotopic analysis of the reactor coolant for iodine including T-131, I 133, 1-134 and I-135 shall be performed once per 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> whenever the specific aelvity exceeds 3.5 pCi/ gram dose espilvalent I-131 or 311/E pCi/ gram.

One sample shall be analyzed between 2 and 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> following a thermal power change exceeding 15 percent thermal

.)

power in a one hour period.

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