ML20249B780

Forwards Request for Addl Info Related to Thermo-Lag Fire Barriers & GL 92-08 for Grand Gulf Nuclear Station,Unit 1

ML20249B780
Person / Time
Site:	Grand Gulf
Issue date:	06/19/1998
From:	Donohew J NRC (Affiliation Not Assigned)
To:	Hagan J ENTERGY OPERATIONS, INC.
References
GL-92-08, GL-92-8, TAC-M82809, NUDOCS 9806240193
Download: ML20249B780 (4)

Text

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June 19, 1998 Mr. Joseph J. Hagan -

Vice President, Oparations GGNS Entergy Operations, Inc.

P. O. Box 756 -

. Port Gibson, MS 39150 -

SUBJECT:

REQUEST FOR ADDITIONAL INFORMATION RELATED TO THERMO-LAG

' FIRE BARRIERS AND GENERIC LETTER 92-08 FOR GRAND GULF NUCLEAR STATION, UNIT 1 (TAC NO. M82809)

Dear Mr. Hagan:

In your letter of June 5,1997, you submitted the response to the staffs request for additional

- information (RAl) that was in the staffs letter of February 26,1997. The staff has reviewed the information provided in your June 5,1997, letter and has identified several areas needing clarification as described in the enclosure. These areas were discussed with your staff on

. June 17,1988, to expedite the response to the enclosed RAl. The enclosed RAI is part of the generic resolution of ampacity derating issues that was addressed in our letter of April 21,1997,

'on Generic Letter 92-08.

You are requested to provide a response to the RAI in the enclosure within 60 days of the receipt of this letter. If there are any questions conceming the enclosure, please contact me by phone at 301-414-1307, or by e . mail at jnd@nrc. gov on the Intemet.

Sincerely, i )

y' J e4 ack N. Donohew, tenior Project Manager C Project Directorate IV 1 Division of Reactor Projects Ill/IV Office of Nuclear Reactor Regulation Docket No. 50-416 -

Enclosure:

Request for Additional Information cc w/ encl: See next page DISTRIBUTION:

Docket File PUBLIC PD4-1 r/f E. Adensam (EGA1) J.Donohew T. Gwynn, RIV ACRS OGC (15B18) C.Hawes J.Hannon ' J. Calvo A. Pal Document Name: ~ GG82809.RAI :(MEMO Dated 04/21/981 i OFC- PMtlPO1~ LA/PD4-1 PD/PDIV-1h

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NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 30086 4 001 1

\*****/ June 19,1998 Mr. Joseph J. Hagan Vice President, Operations GGNS Entergy Operations, Inc.

z P. O. Box 756 l l Port Gibson, MS 39150 l

SUBJECT:

REQUEST FOR ADDITIONAL ;NFORMATION RELATED TO THERMO-LAG FIRE BARRIERS AND GENERIC LETTER 92-08 FOR GRAND GULF NUCLEAR STATION, UNIT 1 (TAC NO. M82809)

Dear Mr. Hagan:

In your letter of June 5,1997, you submitted the response to the staff's request for additional information (RAI) that was in the staff's letter of February 26,1997. The staff has reviewed the information provided in your June 5,1997, letter and has identified several areas needing ,

clarification as described in the enclosure. These areas were discussed with your staff on l June 17,1988, to expedite the response to the enclosed RAl. The enclosed RAI is part of the 1 generic resolution of ampacity derating issues that was addressed in our letter of April 21,1997, on Generic Letter 92-08.

You are requested to provide a response to the RAI in the enclosure within 60 days of the receipt of this letter. If there are any questions conceming the enclosure, please contact me by phone at 301-414-1307, or by e-mail at jnd@nrc. gov on the intemet.

Sincerely, D

l l \

M Jack N 2'.h M'e t Donobew, Senior Project Manager Project Directorate IV-1 Division of Reactor Projects Ill/lV Office of Nuclear Reactor Regulation Docket No. 50-416

Enclosure:

Request for Additional Information cc w/ encl: See next page

p Mr. Joseph J. Hagan Entergy Operations, Inc. Grand Gulf Nuclear Station cc:

Executive Vice President General Manager, GGNS

& Chief Operating Officer Entergy Operations, Inc.

! Entergy Operations, Inc. P. O. Box 756 P. O. Box 31995 Port Gibson, MS 39150 Jackson, MS 39286-1995 l

Attomey General Wise, Carter, Child & Caraway Department of Justice P. O. Box 651 State of Louisiana Jackson, MS 39205 P. O. Box 94005 Baton Rouge, LA 70804-9005 Winston & Strawn 1400 L Street, N.W. - 12th Floor State Health Officer Washington, DC 20005-3502 State Board of Health P. O. Box 1700 Director Jackson, MS 39205 Division of Solid Waste Management Mississippi Department of Natural Office of the Govemor Resources State of Mississippi P. O. Box 10385 Jackson, MS 39201 Jackson, MS 39209 Attomey General President, Asst. Attomey General Claibome County Board of Supervisors State of Mississippi P. O. Box 339 P. O. Box 22947 Port Gibson, MS 39150 Jackson, MS 39225 Regional Administrator, Region IV Vice President, Operations Support U.S. Nuclear Regulatory Commission Entergy Operations, Inc.

611 Ryan Plaza Drive, Suite 1000 P.O. Box 31995 Arlington,TX 76011 Jackson, MS 39286-1995 Senior Resident inspector Director, Nuclear Safety U. S. Nuclear Regulatory Commission and Regulatory Affairs P. O. Box 399 Entergy Operations, Inc.

Port Gibson, MS 39150 P.O. Box 756 Port Gibson, MS 39150

y REQUEST FOR ADDITIONAL INFORMATION RELATED TO GENERIC LETTER 92-08. THERMO LAG FIRE BARRIERS

.ENTERGY OPERATIONS. INC.

GRAND GULF NUCLEAR STATION. UNIT 1 DOCKET NO. 50-416 Entergy Operations, Inc. (the licensee) submitted the letter dated June 5,1997, in response to

- the staffs request for additional information (RAI) dated February 26,1997. After reviewing the information submitted in the letter dated June 5,1997, the staff has the following questions:

1. In response to Question 2 of the staffs RAI, it is stated that " Room OC302 has an average temperature of approximately 80 degrees F and typically a temperature of less than 86 degrees F (30 degrees C)." The ICEA Standard allows an ampacity factor of 1.09 for an ambient temperature of 30 degrees C provided the room temperature never exceeds that temperature. Therefore, a room temperature of 40 degrees C for some length of time and 20 degrees C for the remaining period, with the average being 30 degrees C, will not qualify for an ambient room temperature of 30 degrees C. Confirm that the ambient temperature of Room OC302 will not exceed 30 degrees C. In addition, discuss the procedure that applies to monitoring and controlling the room temperature.

2. Provide (1) the details of the analytical method used to calculate an ampacity correction factor of 44%and (2) a copy of the paper entitled, " Fire Endurance and Ampacity Testing  !

of One- and Three-Hour Rated Thermo-Lag Electrical Raceway Fire Barrier System." {

Discuss if the paper is endorsed by the IEEE? l

3. - it is the staffs understanding that the licensee stated to the effect that all loads except the emergency switchgear and battery rooms cooling motor will have at least 100% of rated voltage for all conditions. The emergency switchgear and battery rooms cooling motor will have instead at least 98% of rated voltage for all conditions. Hence, no i adjustment of full-load current for constant KVA loads due to voltage contingencies is required. Confirm that these statements are correct for Grand Gulf and discuss the effects of variation in voltage experienced by the constant KVA loads in the past at Grand l

Gulf.

4. In response to Question 1 of the staffs RAI, the license stated that an ampacity dorating factor of 48% is used for the configuration of two horizontal conduits enclosed by

. Thermo-Lag; however, an ampacity derating factor of 44% was calculated for the I conduits using the analytical method described in the response to Question 2 of the staffs RAl. Discuss which dorating factor is correct and identify which raceways '

i enclosed by Thermo-Lag would have sufficient design margin given an ampacity dorating

~ factor of 48%.

L l

ENCLOSURE l