ML19323D864

Submits Info Re Proposal for Permanent Type Repair of Containment Electrical Penetrations.Penetration Modules Which Have Experienced Insulation Resistance Degradation, Will Be Replaced

ML19323D864
Person / Time
Site:	Millstone
Issue date:	05/13/1980
From:	Counsil W NORTHEAST NUCLEAR ENERGY CO.
To:	Clark R Office of Nuclear Reactor Regulation
References
TAC-11348, TAC-11561, TAC-12505, TAC-42846, TAC-7424, NUDOCS 8005220452
Download: ML19323D864 (2)

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"::Z"::,0lll l May 13, 1980 Docket No. 50-336 Director of Nuclear Reactor Regulation Attn:

Mr. Robert A. Clark, Chief Operating Reactors Branch #3 U. S. Nuclear Regulatory Commission Washington, D. C.

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References:

(1)

R. Reid letter to W. G. Counsil dated May 12, 1979.

(2)

D. C. Switzer letter to G. Lear dated Feb uary 10, 1978.

Gentlemen:

Millstone Nuclear Power Station, Unit No. 2 Resolution of Cycle 3 Startup Commitments In Reference (1), the NRC Staff issued License Amendment No. 52 and the supporting Safety Evaluation to Facility Operating License No. DPR-65, for 11111 stone Unit No. 2.

Documented in Reference (1) was a commitmeat for Northeast Nuclear Energy Company (WNECO) to provide a proposal for a permanent type repair of the containment electrical penetrations.

In response to that comr.itment, NNECO hereby provides the folloving informa-tion.

Millstone Unit No. 2 utilizes forty (40) electrical penetration assec511es.

Of these forty (40) penetration asseublies, NNECO is currently scheduling to replace the modules associated with thirty-two (32) electrical penetrations during the 1980 refueling outage. All modules will be replaced which have experienced insulation resistance (IR) degradation. The new modules will be qualified to the requirements specified in IEEE 317-1976.

IEEE 317-1976 is the most current standard prescribing the requirements for the design, conscruc-tion, test, and installation of electric penetration assemblies in nuclear contain-ment structures. As such, the penetration modules to be installed at Millstone Unit No. ? during the upcoming refueling outage are superior to those modules' required in the original design criteria of Millstone Unit No. 2.

v Equipment delivery delays and other schedular considerations may preclude replacement of all 32 penetration assemblies during the 1980 refueling outage.

NNECO intends to replace the remaining penetration modules, which have not experienced IR degradation, during future outages.

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I. The remaining eight (8) penetration assemblies are comprised of four (4) low c

voltage control penetrations and four (4) penetrations assemblies servicing j

the Reactor Coolant Pump (RCP) motors.

I NNECO has determined that the four (4) RCP penetration assemblies are capable of satisfactory performance for the remaining life of the plant. The four (4) low voltage control penetrations were previously replaced as reported in Reference (2).

We trust you find this information satisfactory to disposition the Ref erence (1) commitment.

Very truly yours, NORTilEAST NUCLEAR ENERGY, COMPANY l',l Ann

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W. 6.~Co'unsil Vice President i

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