ML20135B448

Ack Receipt of 961220 Submittal as Part of Responses to GL 92-08 on Thermo-Lag Fire Barriers.Rai Encl

ML20135B448
Person / Time
Site:	Grand Gulf
Issue date:	02/26/1997
From:	Donohew J NRC (Affiliation Not Assigned)
To:	Hagan J ENTERGY OPERATIONS, INC.
References
GL-92-08, GL-92-8, TAC-M85554, NUDOCS 9703030053
Download: ML20135B448 (5)

Text

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. Mr. Joseph J. Hagan .

usn 6 W7 Vice President, Operations.GGNS '

Entergy Operations,-Inc. 1

.P.'O. Box 756  ;

Port Gibson, MS 39150

SUBJECT:

REQUEST FOR ADDITIONAL INFORMATION RELATED TO THERMO-LAG FIRE BARRIERS, GENERIC LETTER 92-08, GRAND GULF NUCLEAR STATION (TAC NO. M85554)" g

Dear Mr. Hagan:

l The staff is currently reviewing your submittal dated December 20, 1996, which was submitted as part of your responses to Generic Letter 92-08 on

! Thermo-Lag fire barriers. To permit us to continue our review on our current schedule, we request that the additional information requested in the

! enclosure be provided within'30. days of your receipt of.this letter. This requestforadditionaiinformationwasdiscussedinatelephoneconference call with your staff on February 20, 1997.

c'e rely i h C;ENTEllCDPi a A -

• /W47 o o ew, Senior Project Manager

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,. ,3 Project Directorate IV-1 Division of Reactor Projects III/IV

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.0ffice of' Nuclear Reactor Regulation e

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Docket No. 50-416 I' .

Enclosure:

"Reques'tfoEAddition -

Information a ,? i cc.w/ enc 1: ,.See next page

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[ S NUCLEAR REGULATORY COMMISSION

$ E f WASHINGTON, D.C. 30ssH001 j  %,...../ February 26, 1997 i

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Mr. Joseph J. Hagan Vice President, Operations GGNS Entergy Operations,-Inc.

P. O. Box 756

. Port Gibson, MS 39150

SUBJECT:

REQUEST FOR ADDITIONAL INFORMATION RELATED TO THERMO-LAG FIRE i BARRIERS, GENERIC LETTER 92-08, GRAND GULF NUCLEAR STATION l (TAC NO. M85554)

Dear Mr. Hagan:

The staff is currently reviewing your submittal dated December 20, 1996, which was submitted as part of your responses to Generic Letter 92-08 on i

! Thermo-Lag fire barriers. To permit us to continue our review on our current

{ schedule, we request that the additional information requested in the enclosure be provided within 30 days of your receipt of this letter. This

! request for additional information was discussed in a telephone conference call with your staff on February 20, 1997.

Sincerely, hh &&

ack N. Donohew, Senior Project Manager roject Directorate IV-1 Division of Reactor Projects III/IV Office of Nuclear Reactor Regulation Docket No. 50-416

Enclosure:

Request for Additional Information cc w/ enc 1: See next page

- Mr. Joseph J. Hagan Entergy Operations, Inc. Grand Gulf Nuclear Station

• l cc: )

l Executive Vice President General Manager, GGNS l

& Chief Operating Officer Entergy Operations, Inc. l Entergy Operations, Inc. P. O. Box 756 l l P. O. Box 31995 Port Libson, MS 39150 l l

Jackson, MS 39286-1995 )

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 i 1400 L Street, N.W. - 12th Floor State Health Officer j

, Washington, DC 20005-3502 State Board of Health l P. O. Box 1700 i Director Jackson, MS 39205 j Division of Solid Waste Management

Mississippi Department of Natural Office of the Governor Resources State of Mississippi P. O. Box 10385 Jackson, MS 39201 l Jackson, MS 39209 I

- Attorney General  !

4 President, Asst. Attorney General '

Claiborne County Board of Supervisors State of Mississ'ippi Port Gibson, MS 39150 P. O. Box 22947 i Jackson, MS 39225 Regional Administrator, Region IV U.S. Nuclear Regulatory Commission Vice President, Operations Support '

611 Ryan Plaza Drive, Suite 1000 Entergy Operations, Inc.

Arlington, TX 76011 P.O. Box 31995 4 Jackson, MS 39286-1995 Senior Resident Inspector

U. S. Nuclear Regulatory Commission Director, Nuclear Safety

> Route 2, Box 399 and Regulatory Affairs Port Gibson, MS 39150 Entergy Operations, Inc.

i P.O. Box 75b Port Gibson, MS 39150

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Manager of Operations

Bechtel Power Corporation P.O. Box 2166 Houston, TX 77252-2166

REQUEST FOR ADDITIONAL INFORMATION  !

l RELATED TO GENERIC LETTER 92-08. THERMO-LAG FIRE BARRIERS i ENTERGY OPERATIONS. INC.

GRAND GULF NUCLEAR STATION. UNIT 1 ,

l

. DOCKET NO. 50-416 In reviewing th'e licensee's submittal dated December 20, 1996, as part of the licensee's responses to Generic Letter 92_-08, the staff has the following questw: for. clarification of the Attachment I to that letter:

1.' In the first part of the licen'see's response to Question 1 (attached to the submittal of December 20,1996) regarding Multiple Conduits in a Common Enclosure, it is not clear whether the grouping factors given in ,

Table IX of ICEA Standard F-46-426 are part of the design calculations '

for plant electrical raceways independent of the derating factor for the Thermo-Lag fire barrier installations and simply omitted from the subject calculations or are the subject grouping factors being commingled into the overall derating factor for the Thermo-Lag installations. If the latter case is true, clarify which factor applies for the Thermo-Lag  !

contribution versus the grouping derating factors when the spacing  !

between the conduit surfaces is not greater than the conduit diameter or i less than 1/4 of the conduit diameter. Also, discuss the applicability 1 of industry standard grouping factors in the subject calculations which were submitted in the licensee's letter of June 28, 1996.

In the second part of the licensee's response to Question I regarding Individually Enclosed Conduits, it is not clear whether a conduit grouping factor will be applied to all applicable cables and applicable design calculations will be revised to reflect these derating factors. l Clarify the licensee's commitment in its submittal dated December 20,  !

1996.

2. In the licensee's response to Question 2, the licensee statt.d the following: " Continuously energized constant KVA loads powered by cables within the scope of this evaluation are sized to drive no more than 100%

of their horsepower. Therefore, overloading of cables connected to constant KVA loads, due to continuous operation at 115% of rated .

horsepower, does not require additional ampacity derating consideration."  !

The staff believes that ampacity margin determinations should be based on worst case continuous ampere loading, instead of using equipment nameplate data which may not reflect actual field conditions. This question is not intended to address ampacity derating due to transient voltage conditions. The staff's concern pertains to the potential understatement of final ampacity margins (i.e., after derating for Thermo-Lag and other typical design factors (e.g., cable fill, ENCLOSURE

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4 temperature) based on the use of non-conservative ampere loading values )

. (i.e., using equipment nameplate data when the load is operated above its i full load ampere rating). The licensee is requested to clarify its -

December 20, 1996, response in terms of the above stated concern. I i

j The worst-case non-transisnt condition is having the voltage at the load terminals at 90% of rated voltage because the current will then be at its highest for the load. This condition is not a concern to the staff if the licensee can verify that the voltage at the load terminals will never

! be below 100% of rated voltage. The staff requests if the licensee can verify that this is true for the unit.

3. In the licensee's response to Question 6, a technical rationale was

presented by the licensee to explain how the installed configurations are

bounded by referenced ampacity derating tests. The staff requests that

the applicable engineering reports be revised to reflect the use of the Thermo-Lag Flexi-Blanket 330-660 fire barrier material and the associated j technical justification for the its ampacity derating factor.

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