ML20091L899

Proposed Tech Specs Specifying Appropriate Limits of Hydrogen & Oxygen in Waste Gas Holdup Sys for Expected Plant Conditions & Evolutions

ML20091L899
Person / Time
Site:	Three Mile Island
Issue date:	06/01/1984
From:	GENERAL PUBLIC UTILITIES CORP.
To:
Shared Package
ML20091L889	List: ML20091L887 ML20091L892 ML20091L899
References
NUDOCS 8406080246
Download: ML20091L899 (5)

Text

. .

l TABLE 3.21-2 RADIOACTIVE LIQUID EFFLUENT MONITORING INSTRUMENTATION MINIMUM ,

CHANNELS INSTRUMENT OPERABLE APPLICABILITY ACTION

1. Waste Gas Holdup System

a. Noble Gas Activity Monitor 1 *** 25 (RM-A7)

b. Effluent System Flow Rate 1 *** 26 Measuring Device i L

(FT- 123)

2. Waste Gas Holdup System Explosive Gas Monitoring System

a. Hydrogen Monitor 1 **

30 ,

b. Oxygen Monitor 1 ** 30 .

9 a

6 O

+

8406080246 840601 3-101

, PDR ADOCX 05000289 P PDR

TABLE 3.21-2 (Continued)

TABLE NOTATION

• At all times ,

• • During waste gas holdup system operation.

• • • 0perability is not required when discharges are positively controlled through the closure of WDG-V47, and RM-A8 and FT-151 are operable.

ACTION 25 With the number of channels OPERABLE less than required by the Minimum Channels OPERABLE requirement, the contents of the tank may be released to the environment for up to 14 days provided that prior to initiating the release:

1. At least two independent samples of the tank's contents are analyzed, and

2. At least two technically qualified members of the Unit staff indepencently verify the release rate calculations and verify the discharge valve lineup.

3. The Manager Unit 1 shall approve each release.

Otherwise, suspend release of radioactive effluents via this pathway.

ACTION 26 With the number of channels OPERABLE less than required by the Minimum Channels OPERABLE requirement, effluent releases via this pathway may continue for up to 28 days provided the flow rate is estimated at least once per 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />.

ACTION 27 With the number of channels OPERABLE less than required by the Minimum Channels OPERABLE requirement, effluent releases via this pathway may continue for up to 28 days provided grab samples are taken at least once per 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> and these samples are analyzed for gross activity within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. (See also Specification 3.5.1 Table 3.5-1, Item 3.f)

ACTION 30 With the number of channels OPERABLE less than required by the Minimum Channels CPERABLE requirement:

1. Operation of this system may continue for up to 14 days,

, provided grab samples are collected and analyzed for the inoperable gas channel (s).

(a) at least once'per 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> during degassing operations.

(b) at least once per 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> during other operations.

3-105 L

4 1

i

' TABLE 3.21-2 (Continued)

TABLE NOTATION

-ACTION 31 With the number of diannels OPERABLE less than required by the

!!inimum Channels OPERABLE requirenent, effluent releases via this 4

pathway may continue for up to 28 days, provided, that within four

hours af ter the channel has been declared inoperable, samples are continuously collected with auxiliary sampling equipment.

i I

i g

k s

4 N

4 d-105a

• =

RADIDACTIVE EFFLUENTS EXPLOSIVE GAS MIXTURE LIMITING CONDITIONS FOR OPERATION 3.22.2.5 The concentration of oxygen in the Waste Gas Holdup System shall be limited to less than or equal to 2% by volume whenever the concentration of hydrogen in the Waste Gas Holdup System is greater than or equal to 4% by volume.

APPLICABILITY: At all times.

ACTION: Whenever the concentration of hydrogen in the Waste Gas Holdup System is greater than or equal to 4% by volume, and:

a. The concentration of oxygen in the Waste Gas Holdup System is greater than 2% by volume, but less than 4% by volume, without delay begin to reduce the oxygen concentration to within its limit,

b. The concentration of oxygen in the Waste Gas Holdup System is' greater than or equal to 4% by volume, immediately suspend -

additions to waste gas to the Waste Gas Holdup System and without delay begin to reduce the oxygen concentration to within its limit.

BASES:

Based on experimental data *, lower limits'of flammability for hydrogen is 5%

and for oxygen is 5% by volume. Therefore, if the concentration of either gas is kept below its lower limit, the other gas may be present in higher amounts without the danger of an explosive mixture. Maintaining the concentrations of hydrogen and oxygen such that an explosive mixture does not occur in the waste

~

gas holdup system provides assurance that the release of radioactive materials will be controlled in conformance with the requirements of General Design

~

Criterion 60 of Appendix A to 10 CFR 50.

e *

• Bullentin 503, Bureau of Mines; Limits of Flammability'of Gases and Vapors.

3-116 I

r TABLE 4.21-2 RADIOACTIVE GASE US EFFLUENT MONITORING INSTRUMENTATION SURVEILLANCE REQUIREMENTS' OIANNEL SOURCE CllANNEL CHANNEL APPLICABILITY INSTRUMENT CHECK CllECK CALIBRATION TEST 1.- Waste Gas Holdup System Noble Gas Activity Nbnitor' P P R(3) Q(1) ***

a.

(RM-A7)

R ***

b. System Effluent Flow Rate P N/A Q Measuring Device (FT-122).

.l

2. . Waste Gas Holdup System

.p Explosive Gas Monitoring System M **'

N/A

~ a. Hydrogen Monitor- D Q(4)

M **

b. Oxygen. Monitor D N/A Q(5) b h _ _ _ _ _ _ _ _ _ . _