ML20238C643

Forwards Safety Evaluation & SALP Input Re Util 861021,1117, 1208,1216 & 870127 Submittals Re MSIV Mechanical Design & Closure Time Problems.Modified Actuator Design & Closure Time Operability Acceptable.Confirmatory Info Required

ML20238C643
Person / Time
Site:	Nine Mile Point
Issue date:	02/05/1987
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 8709100273
Download: ML20238C643 (1)

Text

'/

4 FEB 0 51987 gf/

1. M0 Docket No.:

50-410 q

MEMORANDUM FOR:

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

FROM:

Gus C. Lainas, Assistant Director Division of-BWR Licensing

SUBJECT:

SAFETY EVALUATION FOR OPERABILITY OF MODIFIED MAIN STEAM f

ISOLATION VALVES (MSIV) DURING FIRST FUEL CYCLE FOR NINE MILE POINT, UNIT 2

Reference:

Memorandum Gus C. Lainas to Elinor Adensam, Dated October 27, 1986, Safety Evaluation for Operation of Main Steam Isolation Valves during First Fuel Cycle with Refurbished Seat and Ball By letters dated October 21, November 17, December 8, December 16, 1986, and January 27, 1987, the licensee has provided information on the Nine Mile

• Point Unit 2 main steam isolation valve mechanical design and closure time problems, including corrective action and technical justification, and a,

commitment to perform additional confirmatory testing.

The enclosed SER addresses these cencerns in order to permit use of the modified MSIVs during the first fuel cycle.

We' find that the modified MSIV actuator design and closure time operability are acceptable for use in providing primary containment isolation from the time of criticality to the end of the first fuel cycle.

However, confirmatory information will be required to verify continued acceptable MSIV performance during this period.

License conditions have been proposed in the referenced memorandum to obtain certain confirmatory data from the MSIV prototype test program and from specific operability tests to be performed during the initial fuel cycle of operation.

Our SALP input is also enclosed.

6 Gus C. Lainas, Assistant Director Division of BWR Licensing

Enclosure:

As stated CONTACT:

J bardo

• see next page for concurrences.

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DATE :2 / 2 /87

2/ 2 /87 2 / 2 /87

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OFFICIAL RECORD COPY (5520 document name: Lombardo-2)

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