ML20100C044

Secondary Containment Leak Test Summary

ML20100C044
Person / Time
Site:	Quad Cities
Issue date:	01/24/1996
From:	Pearce L COMMONWEALTH EDISON CO.
To:	Miller H NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
LWP-96-004, LWP-96-4, NUDOCS 9601300003
Download: ML20100C044 (3)

Text

Commonwealth I:dimn Company

• Quad Cities Generating Station 22710 2mith Avenue North

. Cont <n a. Ilil 212-9740 Tel .W165 4-22 41 LWP-96-004 January 24, 1996 Mr. Hubert J. Miller  :

Regional Administrator  :

U.S. Nuclear Regulatory Commission Region III 801 Warrenville Road Lisle, IL 60532-4351

SUBJECT:

Quad Cities Station Units 1 and 2 Secondary Containment Capability Test Summary Technical Report NRC Docket Nos. 50-254 and 50-265

Dear Mr. Miller:

Attached, in accordance with Section 6.6.B.4 and Table 6.6-1 of

. Appendix A to DPR-29 and DPR-30, is a summary of the Secondary Containment Leak Rate Test performed for the Quad Cities Station Units 1 and 2 Reactor Buildings on January 21, 1996. This test was performed in accordance with Section 4.7.C.1.c of the Quad Cities Units 1 and 2 Technical Specifications.

Very truly yo s,

,Q). , /tt u .

t. W. Pearce i Station Manager i Quad Cities Nuclear Power Station l 1

l LWP/0VI/sml Enclosure cc: C. Miller, Senior Resident Inspector, Quad Cities 9601300003 960124  ;

PDR ADOCK 05000254 P PDR ,,

300010 STMGR\004% LWP

.ol1 A li nicom Company

i Quad Cities Nuclear Power Station -

Units 1 and 2  :

Secondary Containment Leak Rate Test Summary j Introduction Prior to the Unit One Refueling Outage at the End of Cycle Fourteen operations, a Secondary Containment Leak Rate Test was performed on the  :

combined volume of the Unit One and Unit Two Secondary Containment Building.

The test was performed to demonstrate the ability of the Standby Gas Treatment System (SBGTS) to maintain a quarter of an inch of water vacuum in both '

Reactor Buildings simultaneously with a filter train flow rate of not more  ;

than 4000 cfm. The test was conducted with a local filter train flow rate of '

3980 cfm.

Secondary Containment Capability Test The test was initiated at 0911 hours0.0105 days <br />0.253 hours <br />0.00151 weeks <br />3.466355e-4 months <br /> on January 21, 1996 with the 'B' SBGTS train in primary by simulating a "HI" radiation signal in the Reactor Building Ventilation Monitors. This action isolated the Reactor Building Ventilation systems, stopping all operating supply and exhaust fans, and starting 'B' SBGTS train. When equilibrium conditions were reached, differential pressure ,

readings were taken. l t

Test Results  ;

Data on wind speed, wind direction, building inside and outside temperatures, and differential building pressures were obtained for SBGTS flow rate of approximately 3980 cfm on the 'B' filter train. The test data represents the "as-found" condition of the Secondary Containment Building.

A 4 inch hole (leak) in the Secondary Containment was induced during the test. >

The purpose was to obtain data in order to quantify the performance of the Secondary Containment in a degraded condition. The leak was induced by opening a four inch fire header from outside to the Reactor Building.

Corrections for the reactor building to atmosphere differential temperature have been performed and are shown along with the uncorrected data in this report.

STMOR\004%.LWP s

. -. . -_ . ~. . . - - _ - - . . -

l

SUMMARY

OF TEST DATA i,

January 21, 1996  ;

Quad Cities 1 & 2 Reactor Buildina leak Rate f

'B' SBGTS Train f

Differential Wall Pressure (inches of water)  !

Flow (cfm) North South East West 'Averaoe 3980 -0.275 -0.325 -0.280 -0.255 -0.284 Differential Reactor Building to Atmosphere Temperature - 50.9 F  ;

Temperature Correction (inches of water) - -0.045 Temperature Corrected Average  !

Differential Pressure (inches of water) - -0.329 l Induced Leak Rate Results Differential Wall Pressure (inches of water) .i l

Flow (cfm) North South East West Average ,

3980 -0.280 -0.325 -0.280 -0.265 -0.288

• Temperature Corrected Average Differential Pressure (inches of water) = -0.333 Summary of Wind and Temperature Conditions  !

Temperature (deg. F): Indoor 73.2o F Outdoor 22.3 F Wind Velocity (MPH): 6.0 - 8.0 Wind Direction: South (196.8 deg.)

Elevation Above Grade Level (feet): 196 The results of the test indicate that the SBGTS is capable of maintaining a quarter of an inch of water vacuum under calm wind conditions with a filter train flow rate of no more than 4000 cfm. Average reactor building differential pressure for the train results in -0.284 inches of water (without correction for building to atmosphere differential temperature), indicating adequate performance of the Secondary Containment and Standby Gas Treatment System.

STMOR\00496.LWP

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