ML20244E403

Forwards Safety Evaluation & SALP Input Re Operation of MSIVs W/Refurbished Seat & Ball,Per Util 861008,10,17 & 20 Ltrs.Refurbished MSIVs Acceptable for Providing Secondary Containment Integrity Prior to Criticality

ML20244E403
Person / Time
Site:	Nine Mile Point
Issue date:	10/27/1986
From:	Lainas G Office of Nuclear Reactor Regulation
To:	Adensam E Office of Nuclear Reactor Regulation
Shared Package
ML20238A944	List: IA-87-438, Forwards SER & SALP Input Re Util Request for Permission to Operate W/Wye Pattern Globe MSIVs W/O Leakage Control Sys Being Required.Wye Pattern Globe MSIVs Replaced ball-type Msivs.Request Granted ML20238A940 ML20238B200 ML20238C116 ML20238C133 ML20238C168 ML20238C198 ML20238C580 ML20238C643 ML20238C650 ML20238C693 ML20238C712 ML20238C720 ML20244D225 ML20244D227 ML20244D230 ML20244D463 ML20244D466 ML20244D469 ML20244D473 ML20244E235 ML20244E388 ML20244E403 ML20244E456 ML20245A561
References
FOIA-87-438 NUDOCS 8611050420
Download: ML20244E403 (10)

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g NUCLEAR REGULATOR V.COMMISSlON'

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....i Docket No.: 50-41'Q\\

f MEMORANDUM FOR:

Elinor Adensam, Director Project Directorate #3 Division of BWR Licensing l

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'Gus C. Lainas, Assistant Director l

1 Division of BWR Licensing

SUBJECT:

SAFETY EVALUATION FOR OPERATION OF MAIN STEAM ISOLATION VALVES l

DURING FIRST FUEL CYCLE WITH REFURBISHED SEAT AND BALL l

By letters dated October 8,10,17 and 20,1986, the applicant has provided information on the Nine Mile Point Unit 2 main steam isolation velve leakage problem.

This information included the discovery of the problem, failure description, f ailure evaluation and analyses, corrective action and technical justification, end a commitment to perform additional confirmatory testing.

The enclosed SER addresses the leakage concern in the fonn of two issues to permit use of, the refurbished MSIVs during the initial fuel cycle. The first issue address es the use of one MSIV in each main steam line, with a' modified seat spring configuration and recoated tungsten carbide ball, to ensure secondary contain: rent integrity to permit fuel loading and pre-criticality startup tdsting. The MSIh will be in a closed position with the actuaters deactivated to resolve this issue. The second issue involves the use of all eight MSIVv, with modified seat spring configurations,and recoated t.ungsten carbide balls, for primary containment isolation to i

permit criticality and power operation through the initial fuel cycle.

j We find that the refurbished MSIVs are acceptable for use in providing secondary containrrer.t integrity prior to criticality, and for use in providing primary contair, ment isolation from the time: of criticality to the end of the first fuel cycle. Hoever, confirmatory information will te repaired to,

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!11 Elinor Adensam iv' no verify' continued ecceptable MSIV performance during the first fuel cycle. We,

!ly[y therefore. have proposed license conditions to obtain this needed confirmatory E

j inforirstion from the MSIV prototype test program and specific leakage tests is during the'initiali fuel' cycle of Nine Mile Point Unit 2 operation.

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.h Our SALP. inputs,is {also enclosed.

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m Gus C. Lainas, Assistent Director 4,

Division of BWR Licensing

. Enclosbres:

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ii-s lil? t R. W. Houston

~). Milhoan p

J. Calvo

.R. Bosnak M. Haughey R. Hermann 3

Contact:

F. Witt, XE9440

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