ML20029B503

Requests one-time,limited Exemption from Certain Approved Licenses Authorizations for Shipment of Irradiated Fuel Assemblies in USA/5450/AF Model RCC Package.Details Supporting Request Encl

ML20029B503
Person / Time
Site:	07105450
Issue date:	03/05/1991
From:	Nardi A WESTINGHOUSE ELECTRIC COMPANY, DIV OF CBS CORP.
To:	Macdonald C NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS)
References
RS-91-10, NUDOCS 9103110245
Download: ML20029B503 (4)

Text

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35 Electric Corporation i

March 5,1991 U, S. Nuclear Rogulatory Commission ATTN:

Mr. Charles E. MacDonald, Chief Domestic Safeguards and Regional Oversight Branch Transportation Branch Division of Safeguards and Transportation Office of Nuclear Material and Safety Washington, D. C.

20555 Gentlemen:

Subject:

Docket 71 5450: Request for Limited Exemption Pursuant to the provisions -of Title-10, Code-_ of Federal Regulations,-- Part 71,. E.ACKAGING - AND TRANSPORTATION OF RADI0 ACTIVE MATERIAL Subpart B," Exemptions", Westinghouse Electric Corporation-hereby requests a one time, limited exemption from certain approved Licenses authorizations for shipment of unirraGated fuel assemblies in the USAl5450lAF (Model RCC) Package. Details supporting this request are

enclosed, if you have any questions concerning _this submittal, please write to me at:the above address, or telephone -

(412) 374 4652.

Sincerely, WESTINGHOUSE ELECTRIC CORPORATION Cd.Y p A.J. Nardi, Manager Regulatory Services

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-9103110245 910305

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PDR ADOCK 07105450 MT01-c ers

EXEMPTION LIMITATIONS 1)

The exemption shall be limited to shipments of Westinghouse-designed,15x15 B&W-type, test fuel assemblies.

2)

The shipments shall be limited to transport be' ween the Westinghouse Columbia Fuel Fabrication Facility and General Public Utilities TMI-l Reactor.

3)

The shipments shall be limited to the period from hly 1,1991 to December 31,1991.

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SAFETY ANALYSIS l

As shown in the attached table, the assemblies to be shipped (B&W) are identical to the Westinghouse 15 X 15 standard (W STD) and/or optimized (W-OFA) fuel assembly designs currently licensed for shipment it, the USA /5450/AF Model RCC shipping containers -- with the following exceptions:

1)

Instrument Tube Diameter: 0.0030 inch increase.

2)

Instrument Tube Thickness: 0.028 inch increase.

3)

Number of Fuel Rods: Four (4) per assembly increase.

4)

Fuel Stack Length: 2.2 inch per rod decrease.

5)

Nominal Assembly Cross-Section: 0.075 inch increase.

6)

Lattice Pitch: 0.0050 inch increase.

7)

Assembly K.: 0.0033 decrease.

The signi0cance of these exceptions, from a safety perspective, are:

1)

None, since the instrumes tube is sniall in terms of volume displacement and the material is a weak neticen absorber.

2)

None, since the instrument tube is smaT1in terms of volume displacement and the material is a weak neutrca absorber.

3)

None, since the assembly is alreajy significantly under moderated.

4)

None, since assemblies are modeled afinite in length, 5)

None, since the increase is only slight.

6)

None, since the increase is only slight.

7)

Decrease reactivity, however, the reactivity change is within the uncertainty of KENO.

Assembly reactivities were determined by the KENO Va criticality code. The assemblies were modeled infinite in lenc,th, fully moderated, and reflected by six (6) inches of water, Since the AK. between the Westinghouse and B&W assembly designs, with all uncertainty and bias at a 95/95 confidence level, is no greater than 0.0033, it is concluded that the reactivity of the RCC fuel assembly shipping container, with the Westinghouse designed 15 X 15 B&W fuel assemblics under Hypothetical Accident Conditions (HAC), will remain within the envelope of existing license safety controls.

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l 15 X 15 Type Fuel Assembly Parameters (Unspecified Dimensional Units In Inches)

Fuel Assembly 15 X 15 15 X 15 15 X 15 Description Fuel Assembly W-STD W-OFA i B&W -

Type Nominal Pellet 0.3659 0.3659 0.3659 Diameter Nominal Clad 0.0243 0.0243 0.0243 Thickness Clad Material ZIRC ZIRC ZIRC -

Nominal Clad 0.4220 0.4220 0.4220 Outer Diameter

'GT Diameter 0.5460 0.5330 0.5330 GT Thickness 0.0170 0.0170 0.0170 GT Material ZIRC

. ZIRC ZIRC IT Material ZIRC ZlRC ZIRC

=21T Diameter -

?0.5460-0.5330' 0.5300

~IT Thickness 0.0170

'0.0170 0.0450!:-

-Number of

204 204:

208'

-- Fuel Rods -

- Stack' Length :

'1441 144 141.8 Nominal L Assembly -

. 8.445 8.445

-8.520:

Cross Section7 Lattice Pitcht

-0.5630?

-0.5630"

'O.5680i Assembly K.'-

' O.9632-0.9615 L 0.9599--

3 GT -- Guide Tube.

2 IT -- Instrument tube.

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235 5.0 wt%

U enrichment 1

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