ML20010G466

Forwards Sketches of Proposed Mod to Four Sentinel 1S Rtg Units Canned U Shield Rings & Bodies.Mod Allows Proper Clearances for Fuel Capsule W/No Radiological Effect on Units

ML20010G466
Person / Time
Site:	071*****, 07109153
Issue date:	08/25/1981
From:	Mcgrew J TELEDYNE ENERGY SYSTEMS
To:	Mcdonald C NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS)
References
19565, S-JWM-224, NUDOCS 8109210202
Download: ML20010G466 (3)

Text

c

"#PTELEDYNE o

ENERGY SYSTEMS 110 W. TIMONIUM RD.

TIM ONIUM, M D. 21093 Auguct 25, 1981 6,

g PHONE: 3012524220 Refer to: S-JWhl-224 cA TE SES 01981 > $

47/4[3 g

u m srcr m D

• man L

pf s

~

E Transportation Certification Branch Division of Fuel Cycle and Afatorial Safety o

U. S. Nuclear llegulatory Commission Washington, DC 20555

~

Attention:

Afr. Charles T. AlcDonald, Chief

Subject:

Docket No@ Control No.19374 Ileforence: Telecon - J. hicGrew to C. AlcDonald of 24 August 1981 Gentlemen:

Tcledyne Energy Systems has recently received the four " canned" uranium shields which are to be used in the Sentinel 1S RTG units. The shleid components are shown on Page 1 - 26 of our package approval applicatNn, TES-3147, " Sentinel 1S - Radiation Structural and Thermal Evaluation." The depth of the cavity in the shield body of all four units is too shallow, i.e., less than the 5.028 inches dimension shown on Drawing 013-70001, by an average of 0.001 inch. Teledyne proposes to use a 0.093-inch thick toroidal ring of stainless steel that will be tack welded to the 0.375 inch thick top ring of stainless steel that is currently part of the shield body design. This modification will allow proper clearances for the fuel capsule with no radiological effect on the unit.

The shield ring and body sketches are attached.

To accommodate the increased overall height of the unit, an equivalent amount of thermal insulation will be removed from beneath the shield. This will result in an insignificant thermal loss.

It is intended that thi.s modification be effective on the first four units only and that future parts will be in accordancepithlho drawings in our initial submittal package.

'\\

O Sincerely,

/

r

&w $'$0kW l}

g&

fd[

3 Q

John W. hicGrew T.

1 b

g 6'/,7 g gg ycuW O#

Afanager Il hinterials Engineering and Te /

y/

(

ut Enclosures (2): Eight (8) copies of each

- Na t'

' m m ~

19565 8109210202 810825" bl b

6., c PDR ADOCK 071*****

..>- 4 ga1:$

4; <.

.281 DI A-3 R.CS EQUALLY SPACED OW 1

A 3.190DtA B.C.

.. Y l

)

n I

h 2,436 D A i

4.2.9 O DIA

,093 o

I I

jk SWIM-M/F 304 OR 316 STAIMlfSS s

\\ -TACK WELO IN P SHIM STAINESS

/

m i

i i

NNNb

!NNEVA75 h

\\N N

\\

RAMlUM EMIELD i

x s

k. M W GERTINE.L-16

• CAMklED URAN 10M EMIE).D

, ISOch'- P/M 013-700 01-001