ML19324C316

Forwards Response to 881221 Questions Re Fire Barrier Penetration Seal Testing,Per NRC 890223 Ltr.Tests Demonstrated Ability of Cellular Concrete to Successfully Pass ASTM-E-814 & IEEE Flame Resistance Criteria

ML19324C316
Person / Time
Site:	Arkansas Nuclear
Issue date:	05/11/1989
From:	James D ARKANSAS POWER & LIGHT CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
0CAN058905, CAN58905, TAC-61995, TAC-61996, NUDOCS 8911160122
Download: ML19324C316 (3)

Text

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'g -- 2 ARKANSAS POWER & LIGHT COMPANY

' POST OFFICE BOX 551 UTTLE ROCK. ARKANSAS 72203 (501) 377-4000 May 11, 1989 ,

j l0CAN058905 U. S. Nuclear Regulatory Commission Document Control Desk-in o D 55 {

ATTN: Mr. Craig Harbuck NRR Project Manager NRR Mail Stop 13-D-18 Mr. Chet Poslusny, NRR Project Manager NRR Mail Stop 13-D-18 l l

SUBJECT:

Arkansas Nuclear One - Units 1 & 2 Docket Nos. 50-313 and 50-368 License Nos. DPR-51 and NPF-6 Fire Barrier Penetration Seal Testing - Request for Additional Information (TAC Nos. 61995 and 61996)

Gentlemen:-

In your. letter dated February 23,1989(OCNA028920), you requested that AP&L l- respond to three questions on our submittal dated December 21, 1988 L

(OCAN128807). Attached are your questions followed by our responses.

Very trul yours, h/t' l'_ ale E James Super isor, Licensing l

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' Attachment

.~8911160122 090511. f00b l PDR ADOCK 05000313 ,I l F PDC r:

I MEMBEA MiOOLE BOUTH UTILITitis BYSTEM

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u Question 1: What test detail corresponds to plant detail 23 on ,

L drawing A-307? In addition, there does not appear to be any reference' to' specific design criteria on the plant detail such as maximum blackout size and conduit.or pipe size.

L Response: As referenced on A-307-Sheet-1, Rev. 3 contained in our letter of September 17,1987(OCAN098710), Detail 23 was considered unacceptable pending the results of the fire' test contained in our December 21, 1988 submittal. Fire test

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S.W.R.I. 01-1934-001', Detail 24, in conjunction with' Test Report 80NK16616, contained in our letter of June 2,1982 (ICAN068201), is applicable to Detail 23 on drawing A-307-Sheet-1, These tests demonstrated the ability of cellular concrete to successfully pass the ASTM-E-814 and IEEE 634 Flame Resistance and Limiting End Point Temperature criteria for a pipe / conduit and cable tray configuration.

Based on these fire tests and the fact that the 3-hour fire endurance of a wall or floor is.not jeopardized providing that a minimum thickness of 5.8 inches of cellular concrete is installed (reference ACI-523 BR-75), it is AP&L's position that maximum blockout, conduit and pipe sizes are not limiting parameters for this detail.

' Question 2: The test data shows that detail 19b failed the hose stream test. What requirements are established to prevent detail 19 from being used in a~ configuration where detail 19b is actually used to protect safe shutdown equipment?

Response: Deteil 19-A was included in the scope of fire test S.W.R.I.

01-1934-001 to validate a 12-inch diameter pipe sleeve  !

located in a floor internally sealed with silicone foam. l Because Detail 19-A represented an unsymmetrical configuration, American Nuclear Insurers requested that l Detail 19-B also be incorporated as part of this test to i satisfy their requirements. Since Detail 19-B failed the '

hose stream portion of the test, AP&L design drawings do not contain Detail 19-B.  !

p' Question 3: What test detail corresponds to plant detail 1 on drawing '

j 2508? Previous drawings showed that test B&B 1001A was the basis for acceptability of this design. Why was this changed  ;

l to the recent test on the latest drawing revision?

Response: Drawing A-2508-Sheet-1, Rev.13 contained in our letter of September 1987 referenced Fire Test B&B 1001A as the applicable fire test for Detail 1. Penetrations 3.1 through )

3.3 of this test demonstrated the ability of a six-inch depth of silicone foam to function as a 3-hour fire seal for gaps ]

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' of up to six inches containing no penetrants.- This  :

configuration is representative of a seismic gap for which  ;

Detail 1 of A-2508-Sheet-1 is utilized. To further substantiate this' design,-Fire Test Detail 33-A was .

t incorporated into the scope of Fire Test S.W.R.I. 01-1934-001 which was contained in our letter of December 21, 1988. This' N  !

test detail successfully passed the Flame Resistance and

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c - Limiting End Point: Temperature criteria of ASTM-E814 for a  :

u 3-hour duration. Upon receipt of the.results of S.W.R.I. .

01-1934-001,~AP&L revised Drawing A-2508-Sheet-1 Detail-1 to ,

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- reference this document' as the applicable test ' report.' i

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