ML20244B045
| ML20244B045 | |
| Person / Time | |
|---|---|
| Site: | Quad Cities  |
| Issue date: | 04/11/1989 |
| From: | COMMONWEALTH EDISON CO. |
| To: | |
| Shared Package | |
| ML20244B044 | List: |
| References | |
| NUDOCS 8904180347 | |
| Download: ML20244B045 (7) | |
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.ATIACB GEI_1 t
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EBOPOSED CHANGES TO APPENDIXA TECIMICAL SPECIFICATIONS FOR OUAD CITIES ~ STATION UNITS 1" AliD_2 DPR-29' DPR-30 3.7/4.7-4
-3.7/4.7-3 I
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QUAD-ClTTES DPR-29
- 3) 11.5 scf per hour for any one main steam isolation valve when tested at 25 psig.
5.
With the measured overall b.
If any periodic Type A test integrated containment fails to meet either 0.75 L leakage rate exceeding 0.75 or 0.75 L, the test a
Llplicable,fe,storethe scheduleforsubsequentType or 0.75 L as a
A tests shall be reviewed overall integrated leakage and approved by the rate (s) to < 0.75 L or Commission.
If two consecu-
<0.75L,asappli8able.
tive Type A tests fail to t
4 meet either 0.75 L or O.75L,aTypeAlestshall beperformedat.laastevery Nb5 NA 10 = t h until two consecu-for re bba o r^
tive Type A tests meet either
-l cppronmc.4e ever3 0.75 L or 0.75 L, at which l3 monk w rcAcue, timet$eabovetektschedule occus (,jd, may be resumed.
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With the measured combined c.
The accuracy of each Type A leakage rate for all test shall be verified by a penetrations and valves, supplemental test which; except for main steam isolation valves, subject to
- 1) Confirms the accuracy of Type B and C tests exceeding the test by verifying 0.60 L, restore the that the difference combin$dleakageratefor between the supplemental all penetrations and valves, data and the Type A test except for main steam data is within 0.25 L isolation valves, subject to or 0.25 L -
Type B and C tests to t
i 0.60 L.
- 2) Has a duration a
sufficient to establish accurately the change in leakage rate between the Type A test and the supplemental test.
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3.7/4.7-4 Amendment No.
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QUS-CHH5; DPR-39 j
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< L, 11.0 percent.
b.
If any periodic Type A test b) t by weight of the fails to meet either l
containment air per.
0.75 La or 0.75 L,-the t
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24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> at a test schedule for subsequent I
reduced pressure of.
Type.A tests shall be-
-P. 25 psig.
reviewed and approved by the t
Commission.
If two
- 2) A combined leakage rate consecutive Type A tests fail of 1 0.60 La for all to meet either 0.75 La or p
penetrations and. valves, 0.75 L, a Type A test t
except for main steam shall be performed at-each isolation valves shutdown for refueling or subject to Type B and C approximately every 18 tests when pressurized months, whichever occurs to Pa.
first, until two consecutive Type A tests meet either-3) 11.5.scf per' hour for 0.75 La or 0.75 L at l
t any one main steam which_ time the above test isolation valve when schedule may be resumed, tested at 25 psig.
c.
The accuracy of each Type A
.b.
With the. measured overall test shall_be verified by a integrated containment supplemental test which:
leakage rate exceeding 0.75
- La or 0.75 L, as
- 1) Confirms the accuracy of t
applicable, restore the the test by verifying.
j overall integrated leakage that the difference t
rate (s) to 1-0.75 La or between the supplemental 1 0.75 L. as applicable.
data and the Type A test t
data is within.0.25 La c.
With-the measured combined or 0.25 L -
t leakage rate for all penetrations and valves,
- 2) Has a duration except for main steam sufficient to establish isolation valves, subject to accurately the change in Type B and C tests exceeding leakage rate between the 0.60 La, restore the Type A test and the combined leakage rate for supplemental test.
all penetrations and valves, except for main steam
- 3) Requires the quantity of isolation valves, subject to gas injected into the Type B and C tests to containment or bled from 0.60 La.
the containment during the supplemental test to i
d.
Leakage shall be limited to be equivalent to at '
a leakage rate of less than least 25 percent of the or equal to 3.75 percent of total measured leakage La for any one air lock at Pa, 48 psig, or P.
t when pressurized to 10 psig.
25 psig.
d.
Type B and C tests shall be conducted at Pa, 48 psig, at intervals no greater than 24 months except for tests I
involving:
- 1) Air locks, which shall be tested at 10 psig at least once per 18 months, and 1575B 3.7/4.7-3 Amendment No.
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f ATIACISINfT 2 p
SU}Si&RY OF CHht[GSS The following changes' have been identified for. Quad Cities Station.
Units 1 and 2. Technical Specifications i
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Pages 3.7/4.7-4-(DPR-29)
Pages 3.7/4.7-3'(DPR-30)
(a) Surveillance Requirement 4.7.A.2.b (DPR-29, DPR-30)
Replace "least every 18 months" with'"each shutdown for refueling or approximately every 18 months, whichever occurs first,"
(b) Surveillance. Requirement 4.7.A.2.b (DPR-30 only) 1.
Acceptance criteria for Type A tests should read 0.75 L or a
0.75 L '.In the current, Technical Specification, the t
subscript "a" or "t" were omitted.
2.
Capitalize "C" in commission.
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'ATTAC1 BENT 3 1
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DESCRIPTION AND BASES FOR AMENDMENT REQUEST
. Current Technical Specifications require that a Type.A test be performed at least every 18 months in the event that two consecutive Type A
' tests fail to meet the specified acceptance criteria. The proposed change.
would require a Type A test be performed at each. shutdown for refueling or-approximately every 18 months, whichever occurs first, in the event that two-consecutive tests. fail to meet the specified criteria.
.,cThe proposed amendment will change the language in.the current Technical' Specification Surveillance Requirement to be consistent with frequency; delineated in 10 CFR 50 Appendix J.
The current Technical Specification requirement'is more restrictive than 10.CFR 50, Appendix J and could requireLa plant shutdown prior to a scheduled refueling outage, especially;in light'of-18-month fuel cycles. The provisions of 10 CFR 50, Appendix J are structured such that this situation would be prevented.
The proposed change will not affect the regularly scheduled Type A tests'which are performed on a 40 110 month interval and does_not change the methods or duration of the Type.A tests.
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ATTAC1992lT 1 EVALUATION OF SIDHIFICANI_ HAZARDS CONSIDERATION As discussed in the Description of Proposed Amendment Request, the proposed change involves establishing consistent language between Technical Specification Surveillance Requirement and 10 CFR 50, Appendix J.
Commonwealth Edison has evaluated this proposed snendment in accordance with the criteria of 10 CFR 50.92(c) and it has been determined that the change involves no significant hazards consideration. The basis for the determination is documented below.
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BASIS FOR NQ.JIDNJ.EICANT HAZARDS CONSIDERATION i
- 1) The proposed changes does not involve a significant increase in the i
probability or consequences of an accident previously evaluated.
The proposed amendment will change ~the language of the current Quad Cities Technical Specification to be consistent with language contained in 10 CFR j
50, Appendix J.
The present language of the Quad Cities Technical j
Specificatluns requires a retest at least every 18 months, if two l
consecutive Type A tests fails to meet either the 0.75 La or 0.75 Lt criteria.
10 CFR 50, Appendix J allows the Type A retest to be performed at er:h plant shutdown for refueling or approximately every 18 months, whichever occurs first. The proposed change will allow additional time between Type A retests over present Technical Specification requirements, but this additional time between tests is not significant and is acceptable per 10 CFR 50, Appendix J.
The proposed change is necessary in order to allow for an 18 month fuel cycle and performance of the Type A test during a refueling outage. The provisions of 10 CFR 50, Appendix J are structured to prevent requiring a plant shutdown before a scheduled refueling outage in order to perform the Type A retest.
The proposed change will not alter the testing methods or duration of the required testing. The additional time allowance proposed between Type A retests will include a period when the plant is shutdown and thus in a condition where full power peak accident containment pressures are not considered, therefore, these changes do not significantly increase the probability or consequences of previously evaluated accidents.
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.. 2) The proposed change does not' create the possibility of a new or different
. kind of accident from.any accident previously evaluated.
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~J The proposed change will not alter the Type A. test methods or the duration of the test..Even'with the additional time to perform the test,.the Type
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A' retest will still be performed on an accelerated schedule compared to.
the normal Type A test conducted at 40 3 0 month intervals (with the third
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1 test conducted during the shutdown for the 10-year plant inservice inspection). The proposed change does not modify plant design or accident precursors. The change to the Type A retest schedule will provide flexibility without creating the possibility of a new or different kind of accident from any previously evaluated.
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The proposed change does not involve a significant reduction in the margin of safety.
The proposed change adopts the requirements of 10 CFR 50, Appendix J in allowing the Type A retest to be performed at each shutdown for refueling p.
or approximately every 18 months, whichever occurs first. The change will prevent the plant, which is on an 18 month cycle, from having to shutdown prior to a regularly scheduled refueling outage in order to accomplish the Type A retest requirement.
The change will not affect the regularly scheduled Type A tests which are performed on a 40 110 month interval and will not change the methods or duration of the Type A tests. The proposed change to the Technical Specifications can allow longer times between Type A retest requirements'than the present 18 months, but will still require retests on an accelerated schedule as compared to the normal Type A test schedule.
Since the Type A test requirements are not modified by the proposed change and an accelerated retest schedule is maintained, the proposed change does not involve a significant reduction in the margin of safety.
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