ML20099L151

Proposed Tech Spec Changes,Revising Sections 3.6.1.2 & 4.6.1.2 Re Containment Leakage Rates Limiting Condition for Operation & Surveillance Requirements,Respectively

ML20099L151
Person / Time
Site:	Davis Besse
Issue date:	11/20/1984
From:	TOLEDO EDISON CO.
To:
Shared Package
ML20099L130	List: ML20099L127 ML20099L134 ML20099L151
References
TAC-52417, TAC-56794, NUDOCS 8412010024
Download: ML20099L151 (4)

Text

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f n CONTAINMENT SYSTEMS CONTAINMENT LEAKAGE LIMITING CONDITION FOR OPERATION 4

3.6.1.2 Containment leakage rates shall be limited to:

a. An overall integrated leakage rate of 5 L 0.50 percent by

- weightofthecontainmentairper24 houri,atP,,38psig.

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b. A combined leakage rate of 3 0.60 L for all penetrations and valvessubjecttoTypeBandCtestI,whenpressurizedtoP,.

c. A combined leakage rate of 5 0.015 L for all penetrations identified in Table 3.6-1 as seconda*ry containment bypass leakage paths, when pressurized to P,.

d. A single penetration leakage rate of 5 0.15 L for the containment purge and exhaust isolation valve.special tesf.

APPLICABILITY: MODES 1, 23 3 and 4.

ACTION:

4 a. With either (a) the measured overall integrated containment leakage rate exceeding 0.75 L* (b) with the measured combined leakage rate for all penetrattons and valves subject to Type B and C tests leakage rate exceeding exceeding 0.015 0.60 L,L, or (c) with restore thethe combined leakage rate bypass (r) to within the limit (s) prior to iEc,reasing the Reactor Coolan' System temperature above 200*F.

b. With a single containment purge and exhaust isolation valve penetration having leakage rate exceeding 0.15 L ; restore the leakage rate to within limits in 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> or be In at least HOT STANDBY within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />. i i

SURVEILLANCE REQUIREMENTS 4.6.1.2 The containment leakage rates shall be demonstrated at the  !

l following test schedule and shall be determined in conformance with the criteria specifie( in Appendix J of 10 CFR 50 using the methods and I i

provisions of ANSI) N45.4 - 1972:

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a. Three Type A tests (0verall Integrated Containment Leakage Rate) shall be conducted at 40 + 10 month intervals during shutdown at P , 38 psig, during each 10 year service period. The third test ofeachsetshallbeconductedduringtheshutdownforthe10 year plant inservice inspection. j i -

8412010024 841120 PDR ADOCK 05000346 p PDR_.

l CONTAINMENT STSTDfS

't SURVEILIANCE REQUIREMENTS (Continued)

b. If any periodic Type A test fails to meet .75 L , the test schedule for subsequent Type A tests shall be r$ viewed and approved by the Commission. If two consecutive Type A tests fail to meet .75 L , a Type A test shall be performed at least every18monthsunfiltwoconsecutiveTypeAtestsmeet.75L*

at which time the above test schedule may be resumed.

c. The accuracy of each Type A test shall be verified by a supplemental test which:

1. Confirms the accuracy of the Type A test by verifying that

• the difference between supplemental and Type A test data is within 0.25 L,.

2. Has a duration sufficient to establish accurately the change in leakage between the Type A test and the supplemental test.

3. Requires the quantity of gas injected into the containment or bled from the containment during the supplemental test to be equivalent to at least 25 percent of the total measured leakage rate at P,, 38 psig.

d. Type B and C tests shall be conducted with gas at P , 38 psig, at intervals no greater than 24 months except for testI involving:

1. Air locks,

2. Penetrations using continuous leakage monitoring systems, and

3. Valves pressurized with fluid from a seal system.

e. The combined bypass leakage rate shall be determined to be

< 0.015 L, by applicable Type B and C tests at least once every l

24 months except for penetrations which are not individually testable; penetrations not individually testable shall be 1 determined to have no detectable leakage when tested with soap )

bubbles while the containment is pressurized to P,, 38 psig, during each Type A test.

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f. Air locks shall be tested and demonstrated OPERABLE per Surveillance Requirement 4.6.1.3.

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CONTAINMENT SYSTEMS SURVEILLANCE REQUIREMENTS (Continued) 3 Leakage from isolation valves that are sealed with fluid from e seal system may be excluded, subject to the provisions of Appendix J,Section III.C.3, when determining the combined leakage rate provided the seal system and valves are pressurized to at least 1.10 P , 41.8 psig, and the seal system capacity is adequate to maintain Iystem pressure for at least 30 days.

I h. Type B tests for penetrations employing a cont'inuous leakage monitoring system shall be conducted at P,, 38 psig, at intervals no greater than once per 3 years.

i. Each time the containment purge and exhaust isolation valves are opened, a special test shall be performed within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> after valve closure or prior to entering mode 4 from mode 5, whichever is later. The special test is conducted by pressurizing the piping section including one valve inside and one valve outside the con-tainment to a pressure greater or equal to 20 paig. The leakage rate per penetration shall not exceed 0.15 L,.

j. The special test as defined in Surveillance Requirement 4.6.1.2.i shall be performed for the containment purge and isolation valves when the plant has been in any combination of modes 3, 4, 5 or 6 for more than 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> provided that the tests required by Sur-veillance Requirements 4.6.1.2.1 or 4.6.1.2.d have not been performed in the previous 6 months.

k. All test leakage rates shall be calculated using observed data converted to absolute values. Error analyses shall be performed to select a balanced integrated leakage measurement system.

1. The provisions of Specification 4.0.2. are not applicable.

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3/4.6 CONTAINMENT SYSTEMS l

BASES l

l 3/4.6.1 PRIMARY CONTAINMENT 3/4.6.1.1 CONTAIMENT INTEGRITY j Primary CONTAINNT INTEGRITY ensures that the release of radioactive '

materials from the containment atmosphere will be restricted to those leakage paths and associated leak rates assumed in the safety analyses.

This restriction, in conjunction with the leakage rate Ifmitation, will limit the site boundary radiation doses to within the limits of 10 CFR 100 during accident conditions.

3/4.6.1.2 CONTAINMENT LEAKAGE The limitations'on containment leakage rates ensure that the total containment leakage volume will not exceed the value assumed in the safety analyses at the peak accident pressure of 38 psig. P . As an '

added conservatism, the measured overall integrated leakage, rate is further limited to < 0.75 L .dduring performance of the periodic tests to account for possible deg,radation of the containment leakage barriers between leakage tests.

The surveillance testing for messering leakage rates are consistent with the requirements of Appendix]" of 10 CFR 50.

3/4.6.1.3 CONTAI N NT AIR LOCKS The limitations on closure and leak rate for the containment air locks are required to meet the restriotions on CONTAINNT INTEGRITY and containment leak rate. Surveillance testine of the air lock seals provide assurance that the overall air lock leakage will not become excessive due to seal damage during~the intervals between air lock leakage tests. ,

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