B11839, Advises of Intent to Conduct Type a Tests During Mar 1988, Jan 1991 & Mar 1995,per 10CFR50,App J,Section III.A.6(a). Recent Type a Test Exceeds Max Leakage Rate Specified in Tech Specs.Schedule Ensures Primary Containment Integrity

Advises of Intent to Conduct Type a Tests During Mar 1988, Jan 1991 & Mar 1995,per 10CFR50,App J,Section III.A.6(a). Recent Type a Test Exceeds Max Leakage Rate Specified in Tech Specs.Schedule Ensures Primary Containment Integrity

ML20138R295
Person / Time
Site:	Millstone
Issue date:	11/06/1985
From:	Mroczka E, Opeka J NORTHEAST NUCLEAR ENERGY CO., NORTHEAST UTILITIES
To:	Butcher E Office of Nuclear Reactor Regulation
References
B11839, TAC-60646, NUDOCS 8511180530
Download: ML20138R295 (2)

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P.O. BOX 270 HARTFORD CONNECTICUT 06141-0270 L t  ; ya8',]', g c"", (203) 665-5000 November 6,1985 Docket No. 50-336 B11839 Director of Nuclear Reactor Regulation Attn: Mr. Edward 3. Butcher, Chief Operating Reactors Branch #3 U. S. Nuclear Regulatory Commission Washington, D. C. 20555 Gentlemen:

Millstone Nuclear Power Station, Unit No. 2 Scheduling of Type "A" Integrated Leakage Rate Tests Northeast Nuclear Energy Company (NNECO) submitted a report on November 1, 1985(l) for the Millstone Unit No. 2 Reactor Containment Building Integrated Leak Rate Test performed June 1985.

The recently performed Type "A" test AS-FOUND condition determined using the guidelines provided in IE Information Notice 85-71, exceeds the maximum leakage rate specified in the Millstone Unit No. 2 Technical Specifications.

Accordingly, pursuant to 10CFR50, Appendix 3, Section Ill.A.6(a), NNECO hereby submits a schedule for performance of the next set of three Type "A" tests. NNECO intends to conduct the Type "A" tests at the following times:

(the dates given correspond to currently scheduled refueling outages and will change in the event that the outage schedules change).

Ist "A" Test - March 1988 2nd "A" Test - January 1991 3rd "A" Test - March 1995 l NNECO has determined that the above schedule is adequate to ensure primary containment integrity. The AS-LEFT Type "A" test results for the recently performed test were:

Mass point = .1282 wt.%/ day 95% UCL = .1302 wt.%/ day Total Time = .1332 wt.%/ day 95% UCL = .36t #2 wt.%/ day The Type "A" test performed in December 1983 indicated leakage rates similar to the values for the June,1985 Type "A" test. These leakage rates indicate the overall containment leakage is a contant value and the high "AS-FOUND" leakage is a direct result of Type "B" and "C" leakage through containment piping penetration valves.

- OYl (1) 3. F. Opeka letter to E. 3. Butcher, dated November 1,1985. I L 1 8511180530 851106 0 1

PDR ADOCK 05000336 l P PDR

Currently, these penetrations are local leak rate tested (LLRT) every refueling outage and are subject to the acceptance limit in Technical Specification Section 3.6.1.2.b. NNECO intends to continue to monitor local leakage rate test results on this schedule. In an effort to reduce leakage from these penetrations increased maintenance of valves exhibiting the higher leakage will be performed.

This program will effectively reduce the Type "B" and "C" leakage rates and negate the need for performance of more frequent Type "A" tests.

NNECO considers the program schedule described above satisfactory for maintenance of containment integrity and will proceed as described unless otherwise notified. We trust you will find this information satisfactory.

Very truly yours, NORTHEAST NUCLEAR ENERGY COMPANY I E O m r>

3. F. Opeka Senior Vice President 2n)

By: EM./pr'oczka []

Vice Predrdent cc: Division of Reactor Safety Attn: Mr. S. D. Ebneter, Director U. S. Nuclear Regulatory Commission l

Region I 631 Park Avenue King of Prussia, PA 19406 l

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