ML19305E379

Forwards Results of Fire Protection Review,Item 3.1.8,fire Barrier Penetations.Recommends NRC Consider Design & Const of Penetration Seals as Conditionally Acceptable.Typical H Penetration Requires Addl Test Data

ML19305E379
Person / Time
Site:	Vermont Yankee File:NorthStar Vermont Yankee icon.png
Issue date:	04/14/1980
From:	Randy Hall BROOKHAVEN NATIONAL LABORATORY
To:	Ferguson R Office of Nuclear Reactor Regulation
References
NUDOCS 8004230510
Download: ML19305E379 (2)

Text

~. -

~ mn j j ) j _j, j BROOKHAVEN NATIONAL LABORATORY l Illll ASSOCIATED UNIVERSITIES, INC. -

x: sdJ Upton, New York 11973 ,

Department of Nuctect Energy (516) 345- 2144 [

April 14, 1980 Mr. Robert L. Ferguson Plant Systems Branch U.S. Nuclear Regulatory Commission Washington, D.C. 20555 RE: Vermont Yankee, Fire Protection Review, Item 3.1.8.

Dear Bob:

Attached is Item 3.1.8, Fire Barrier Penetrations, for Vermunt Yankee.

This is in response to the licensee's submittal dated February 2'd,1980.

Respectfully yours, 8%

Robert E. Hall, Group Larder Reactor Engineering Analysis REH:EAM:sd ,

attachment cc.: V. Benaroya wo/att. E. MacDougall L. Derderian V. Noonan wo/att.

D. Eisenhut V. Panciera W. Kato wo/att. E. Sylvester M. Levineoob s

                                                                                           /!/

0C04230510

_ .g VERMONT YANKEE , Fire Protection Review Item 3.1.8 - Fire Barrier Penetrations Item 3.1.8 of the Vermont Yankee SER requires the licensee to seal both elec-trical and mechanical penetrations to a maximum of 3 hour fire rating or equi-valent to the fire barrier. The seals will be installed by Chemtrol Corpora- ' tion. The sealant used will be a GE RTV Silicone Elastomer or Foam. The typical pene-trations found at Vermont Yankee have been shown in a series of drawings. Each typical penetration has been ac:epted by American Nuclear Insurers (ANI) as meeting a three hour fire ratirg. The only penetration not approved by ANI is ,

      " Typical H."   Chemtrol and ANI are discussing the penetration seal and its accep-tance test. The licensee wi1*, forward the information to NRC as soon as agree-ment is reached.

The test criteria established by ANI is similar to the NRC requirements except for the pressure differential across the seal. The acceptance criteria for the ANI test is more restrictive in regard to temperature rise than the NRC require-ment. We recommend that the staff consider the design and construction of the penetra-tion seals as conditionally acceptable (except " Typical H") because not all the test criteria of the original position was tested (i.e., pressure differential). If subsequent test results show that the pressure differential in the original NRC position produces a significant downgrading of the penetration seal as pro-posed by the licensee further testing and upgrading to meet this criteria may be required. , We recommend that the conditional acceptance of Typical H penetration should be withheld until adequate test data has been submitted. f

                                                                                          %}}