ML20070S297

Provides Addl Info Re Previous Responses to GL 92-08, Thermo-Lag 330-1 Fire Barriers

ML20070S297
Person / Time
Site:	Prairie Island
Issue date:	05/17/1994
From:	Watzl E NORTHERN STATES POWER CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
GL-92-08, GL-92-8, TAC-M85592, TAC-M85593, NUDOCS 9405230331
Download: ML20070S297 (6)

Text

• Northern States Power Company Prairie island Nuclear Generating Plant 1717 Wakonade Dr. East Welch. Minnesota 55089 May 17, 1994 Generic letter 92-08 US Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555

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PRAIRIE ISIAND NUCLEAR GENERATING PIANT Docket Nos. 50-282 License Nos. DPR-42 50-306 DPR-60 Additional Information Related to Generic Letter 92-08, "Thermo-In 330-1 Fire Barriers" (TAC Nos. M85592 and M85593)

References:

(a) L J Callan, Nuclear Regulatory Commission, to R O Anderson, Northern States Power Company, letter dated December 20, 1993 (b) R O Anderson, Northern States Power Company, to the Nuclear Regulatory Commission, letter dated June 24, 1993 (c) Marsha Gamberoni, Nuclear Regulatory Commission, to R 0 Anderson, Northern States Power Company, letter dated May 18, 1993 (d) R 0 Anderson, Northern States Power Company, to US Nuclear Regulatory Commission 10 CFR 50.54 (f) Response, dated February 10, 1994 This letter provides additional information regarding our previous responses to NRC Generic Letter 92-08.

In Reference (b), we responded to a request for additional information, Reference (c), and, our response included a document " Prairie Island Ampacity Study Tabulations for 10 CFR 50 Appendix R Cable Wrapping". Pages 25 and 26 of this document were inadvertently not included, these two pages are included as Attachment B of this letter.

In Reference (d), we responded to a later request for additional information, Reference (a), and our response did not provide all of the information requested. We provided that information by telephone conference with NRC staff on March 8, 1994 and include that same information below.

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i USNRC May 17, 1994 ,

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Section I.B.1:

The Thermo-Lag fire wrap material was installed at the Prairie Island Nuclear Generation Plant to comply with Appendix R to 10 CFR 50 and, at the same time, to support exemptions from Appendix R.

Section I.B.2:

The Thermo-Lag fire wrap material quantities installed at Prairie -

Island Nuclear Generating Plant are as follows:

Length of conduits wrapped with Thermo-Lag - 325 ft l Length of trays wrapped with Thermo-Lag - 514 ft l Surface area of Thermo-Lag tray wrap - 5270 sq ft 1

This letter contains no new NRC commitments.

Please contact Jack Leveille (612-388-1121, Ext. 4662) if you require further information.

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l E L Watzl I Site General Manager Prairie Island cc: Regional Administrator - III, NRC NRR Project Manager, NRC Sr Resident Inspector, NRC State of Minnesota Attn: Kris Sanda J Silberg Attachments: A) Affidavit to the US Nuclear Regulatory Commission B) Pages 25 and 26 of Prairie Island Ampacity Study Tabulations l for 10~CFR 50 Appendix R Cable Wrapping

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ATTACl! MENT A UNITED STATES NUCLEAR REGUIATORY COMMISSION NORTHEPJi STATES POWER COMPANY PRAIRIE ISIAND NUCLEAR GENERATING PIANT DOCKET NOS. 50-282 50 306 THERMO-IAG 330-1 FIRE BARRIERS Northern States Power Company, a Minnesota corporation, with this letter is submitting information requested by Generic Letter 92-08, Thermo-Lag 330-1 Fire Barriers, pursuant to 10 CFR 50.54(f).

This letter contains no restricted or other defense information.

NORTHERN STATES POWER OMPANY By E L Wa,tzl [},

Site GenerarManager Prairie Island onthisk ay of d /f before. me a notary public in and for said County, persona % appeared E L Watzl, Site General Manager, Prairie Island and being first duly sworn acknowledged that he is authorized to execute this document on behalf of Northern States Power Company, that he knows the contents thereof, and that to the best of his knowledge, information, and belief the statements made in it are true and that it is not interposed for delay, o

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! Pages 25 and 26 of Prairie Island Ampacity Study l l- Tabulations for 10 CFR 50 Appendix R Cable Wrapping- _. j I

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Rev:-2 Page 25 TABLE 7 AMPACITY DERATING 3CEDULE PER IPCEA P-46-426 (1975)

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AMBIENT TEMP CONDUCTOR TEMP DERATING FACTOR 81 90 O.42 82 90 0.40 83 90 0.37 84 90 .

0.35 85 90 0.32 86 90 0.28 '

87 90 0.24 88 90 0.20 89 90 0.14 90 90 0.00 y

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• Rev'. 2 Page 26

. TABLE 8-A TABULATION OF CONDUIT LOSSES USING METHOD-2 0F REFERENCE 4 COND WRAP CONDUIT SIZE TYPE R (ET) R3 (FT)

Rf (FT) LOSS W/FT *C R3 (FT)

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.0343 .0447 .0551 .2218 .0267 1.25 l 0575 .0679 .0783 .245 .0499 1.5 r. .0671 .0775 .0879 .2546 .0401 2 K .0861 .102 .1124 .2791 .0646

.0714 2.5 K .1029 .1185 .1289 .2956 2.5 T .1029 .1185 .1886 .2303 .1068 3 K .1278 .146 .1564 .3231 .0827 3 .T .1278 .146 .1564 .1981 .3315 3.5 K .1478 .166 .1764 .3431 .0907 4 K .1678 .1886 .199 .3657 .0997 4* T .1678 .1886 N/A .2303 .9623 4 T .1678 .1886 .199 .2407 .4173 5 K .2103 .2311 .2415 .4082 .1164 5 T .2103 .2311 .2415 .2832 .5026.

NOTES

1. The .75 in."and 1.5 in. conduit losses are derived using Method-1 of Ref. 4.

• 2. This 4 in. conduit loss of Thermolag is derived 'by neglecting the 1/8 in. air gap.  ;

3. As stated in Introduction, the correct. value (K ) f knowool's  !

3 Thermal Conductivity is applied here.

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4. Slight dif ferences between conduit losses here and those of def. 4 are due to adjustments of radius values.

5. The 2.5 in. conduit loss for Thermolag is calculated using ~

a 13/16 in, air gap.  !

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6. h C = 1.307 Btu /Hy-Ft - F (Kaowool - Ref.1) h = 3 Btu /Hr-Ft *F (Thermolag - Ref. 4)

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