ML20116D409
| ML20116D409 | |
| Person / Time | |
|---|---|
| Site: | Callaway  |
| Issue date: | 10/30/1992 |
| From: | UNION ELECTRIC CO. |
| To: | |
| Shared Package | |
| ML20116D404 | List: |
| References | |
| NUDOCS 9211050372 | |
| Download: ML20116D409 (4) | |
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Attachment to UL!iRC 2713 i
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j PROPOSED:TECHillCAL SPECIFICATIOli CllAliGES
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REVISlay
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3/4.6 CONTAINMENT SYSTEMS c.n ;
~" V,.i' BASES 3/4.6.1 PRIMARY CONTAINMENT 3/4.G.1.1 CONTAINMENT INTEGRITY Primary CONTAINMENT INTEGRITY ensures that the release of radioactive materials fror the containment atmosphere will be restricted to those leakage paths and associated laak retes assumed in the sefety analy.ses. This restriction, in conjunction with the leakagc rate limitation, will limit the
$1TE 80VHDARY radiation donas to within the dose guideline values of 10 CFR Part 100 during accident conditions.
3/4.6.1.2 CONTADHENT LEAKAGE The.llmitations on containment leakap,e rates ensure that the total
-containment leakage volume will not exceed the value assumed in the accident analyses at ti.e peak accident pressure, P,.
As an added conrervatism, the measured overall integrated leakage rate is further limited to less than or equal to 0.75 1.,, during performaice of the periodic test to account for po d
adation of the containment leakage' barriers between leakage tests.
- Ql,j therequirements)ofce testing for measuring leakage rates are consistent with The survell1 pendix J of 10 CFR Part 50.
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3/4.6.1.3 CONTAINME,NTsAIR t0CKS The limitations closure and leak rate for the containment air locks are required to mee the restrictions on CONTAINMENT INTEGRITv end containment leak rate.
Survelli nce testing of the air lock seals provides assurance that the overall air lo leakage will not become excessive due to seal damage during the irytenr81s between air lock leakage tests, v
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INSERT A The following exemptions have been gra7ted to the requirements or Appendix J of 10 CFR part 50:
_1.
Section III.A.l(a) - an exemption to the require-mont to stop the Type A test if excessive leakago is determined.
This exemption allows the satis-factory. completion of the Type A test if the leakage-.can be isolated and appropriately factored into the results.
(NRC Letter, dated October 22, y
1991}
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Section_III.A.5(b) - an exemption for the accep-tance critoria, in lieu of the present single criterion of the total measured containment leakage M
rate being less than 0.75 of the maximum allowable leakage rate, L,
the "as found" allowable leakage rate will:be.L,and the "as Icft" allowable leakage rate will be 18ss than 0.75 L.
(NRC Letter, dated a
October 22, 1991) 3.
Section III.D. l(a) _ - an exemption that removes the
_ requirement that the third test of each set of three. Type A test be conducted when the plant ir shutdown for.the 10-year plant inservice inspection.
(NRC Letter, dated October 22, 1991)
Exemption 1 allows'the continuance of a Type A test
. when_ excessive-leakege is found provided that significant
-leaks are> identified cad isolated.
After: completion of the modified. Type A test (i.e., a Type A test with the significant11eakage paths isolated,during the-test), local
' leakage.l rates of those' paths isolated during the modified 3
_ Type A test will be measured before and after repairs to-those paths.
The adjusted "as four.d" leakage rate for the Type'A test can be determined by adding-the local leakage rates measured, before any repairs _to'those previously isolated < leakage' paths, to the containment integrated leakage' determined-in_the modified Type A' test plus any leakage improvements. (defined below) made prior to the test.
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This adjusted-"as1found" leakage rate is to be used in determining the' scheduling.of the periodic Type A test in accordance-with Section III.A.6 of. Appendix J.
The; acceptability of the modified Type A test can be determined by calculating the adjusted "as left" containment overall-integrated _ leakage rate and comparing it to'the acceptance criteria of 0.75 L The adjusted "as left" Type A' leakage rateKis determined $y..! adding the local leakage rates measured,t after any repairs and/or adjustments to b; ic
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those previously isolated Icakage paths, to the leakage rate determined in the modified Type A test..It should be noted that additiornal adjustments for non-:,tandard lineup and changes in containment volume are added to the measured leakage rate for both "as found" and "as left" determinations.
Leakage improvements are defined as the difference between the pre-repair LLRT and post-repair LLRT done on containment penetrations prior to the start of the Type A
- test..
Thn only. difference between'this approach and Appendix J requirements-are that:
(1) the potentially excessive leakage paths will be repaired and/or adjusted after the Type 1. test is completed; and (2) the Typa A test leakage rate;is partially determined by calculation rather than by-
_ direct: measurement.
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