ML20076E960

Advises of Intent to Adopt Min Test Duration of 8 H for Type a Containment Leak Rate Test,Based on NRC Approval of Rev 1 to Bechtel Topical Rept BN-TOP-1

ML20076E960
Person / Time
Site:	Fermi
Issue date:	08/18/1983
From:	Tauber H DETROIT EDISON CO.
To:	Youngblood B Office of Nuclear Reactor Regulation
References
EF2-64-579, NUDOCS 8308250152
Download: ML20076E960 (2)

Text

,

s, H:rry Tauber Group Vice President Detroit Edison EDI!i=

August 18, 1983 EF2 - 64,579 Director of Nuclear Reactor Regulation Attention: Mr. B. J. Youngblood, Chief Licensing Branch No. 1 Division of Licensing U. S. Nuclear Regulatory Commission Washington, D. C.

20555

Reference:

Enrico Fermi Atomic Power Plant, Unit 2 NRC Docket No. 50-341

Subject:

Containment Leakage Testing, Type A In a letter to your office dated July 31, 1981, Detroit Edison agreed to perform a 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> type A containment leak rate test.

This commitment was based on the fact that the NRC had not yet endorsed ANSI /ANS-56.8-1981, " Containment System Leakage Testing Requirements," which specifies a minimum test duration of 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />.

Since that time, we have learned that the NRC has approved, with-out comment, Bechtel Topical Report BN-TOP-1, " Testing Criteria for Integrated Leakage Rate Testing of Primary Containment Structures for Nuclear Plants", Rev. 1.

NRC approval of this document is l

contained on page II-32 of NUREG-0390, Vol. 6, No. 2, dated January 20, 1983. Due to improved instrumentation and test methods, this report justifies minimum test durations as low as 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />.

f The. instrumentation used to perform the Type A test at Fermi 2 is as accurate, or more accurate than the instrumentation described 1

in BN-TOP-1.

In addition, the Fermi 2 and BN-TOP-1 test methods are the same. Detroit Edison intends to adopt a minimum test duration of 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />. Test duration acceptance criteria will i

follow the acceptance criteria established in BN-TOP-1, Rev. 1.

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8308250152 830818

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B. J. Youngblood August 18, 1983 EF2 - 64,579 Page 2 This reduced duration is consistent with that of several other nuclear facilities which are presently performing Type A tests using minimum test durations of less than 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. Most recently, the NRC approved a request from Niagara Mohawk Power Corporation (Amendment 52 to DPR-63) to change their required minimum test duration from 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> to 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> based on improved instrumentation and BN-TOP-1.

Should you have any further questions, please contact Mr. Larry E.

Schuerman (313) 586-4207.

Sincerely, f

i cc: Mr. P. Byron

' 46' Mr. M. D. Lynch

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