ML20245G904

Responds to Questions Re Decommissioning Costs Incurred by Plants Having Only Operated Approx 60 H at 5% of Full Power

ML20245G904
Person / Time
Site:	Shoreham File:Long Island Lighting Company icon.png
Issue date:	05/26/1988
From:	Rich Smith Battelle Memorial Institute, PACIFIC NORTHWEST NATION
To:	Feldman C NRC OFFICE OF NUCLEAR REGULATORY RESEARCH (RES)
Shared Package
ML20245G898	List: IA-89-166, Requests Commission Approval of Proposed Ltr to Util Re Transfer of Plant to State Agency for Shutdown & Perhaps Decommissioning ML20245G896 ML20245G904 ML20245G923 ML20245G937
References
FOIA-89-166 NUDOCS 8906290312
Download: ML20245G904 (2)

Text

j FI5 f'/f' 891'f O' P8 l

@Battelle Pacific Northwest Laboratories .

P.O. Bon 999 l Richland. Washington U.s.A. 99332 Tetephone iso 91 376-3844 Tele 15 2Cd  ;

fiay 26, 1988 i i

Dr. Carl Feldman  !

Office of Nuclear Regulatory Research -

i U. S. Pluclear Regulatory Commission  ;

Washington, D.C. 20555 l

Dear Carl:

In response to your question concerning the decommissioning costs that might i be incurred for a plant such as Shoreham which has operated only about 60  :

h_qurs at 5% of full power, as compared with the BWR costs given in the firial  !

Decommissioning Rule for a plant which had operated for 30 effective full i power yesrs, I have prepared the following information.

Reactor Vessel Activation levels i To a reasonable approximation, the activity levels in the core materials can '

i be represented by - '

l A = lbp() - e n,st)

The activity level at Shoreham relative to the values calculated fer our * .

C': l reference BWR is given by y;r +., . . ' .

l l (elfe')(1 - eAte )f(3 . ,At. ) -

or 0.05(0.000895)/(0.98) = 0.000045 .-.

i for the conditions at Shoreham.

Fromat Table rate from the inside of the cere shroud Shoreham E.1-7 should of be inNUREG/CR-0572.

the vicinity'8 #

of 5 - 6 R/hr. For the vessel wall, the dots rates should be around 1 mR/hr.

Thus, while the vessel internals would still require remote cuttin4 and: w. M . ' -

packaging, the vessel itself could be sectioned using hands-on teciniques. *

Applying the same factor to the dose rates from contaminated siping, as giveni

• l l-I in Table E.2-4 of the BWR study, the likely dose rates from tie piping systems * ?

should be less than 1 mR/hr, more likely less than 0.1 mR/hr. It is unlikely .

that there is any significant activation of the reactor sacrificial shield /c h,?)",...  !

! While the fluid systems will undoubtedly have some internal cont' amination, it'kPh.' .

f may well be possible to erform a chemical decontamination of those systems * ' - '-

which sould cake them ra casable.for..salvagesor,escrapp disposal costs might be reduced br $25 to' $30' mil 1 ion, negl.!ggtbittTae

~

ecting'any7 scrap -

values. In addition, if the systems are that clean, the working conditions'g. .i " " ',-

4 for removal would be much less severe, with no masks, no anti-C clothes, no shtolding, etc., being needed, which would reduce the difficulty factor on' ,

directlabor direct staffcosts itbor hours of $10 by million.

to $12 a reduction about 20%, and could result in,/jTherefore;;u V.' .

~ l 9906290312 890628 '

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~  ;

Carl Feldman.

Aay 26, 1933 ,

I -

Page 2 conditier.s, the decommissioning costs might be reduced by $35 to '42 million, + '

- t l' On the other hand, under the'most pessimistic conditions, where everything  ;<

still had to go to the LtW burial site, the very low activation levels .

throughout the plant could reduce the decommissioning costs by about $5 to $6 -

million. '

Additional reductions may be possible by removing the fuel from Because the site the

• promptly, thereby reducing the requirements for security staff.

radioactivity levels within the plant are very' low, only ordinary industrial .

securit.v would be necessary once the fuel was removed from the site. The ac savings would depend upon how quickly the fuel was removed and on how large security staff was retained afterwards, but could easily amount to'several million dollars over the life of the decommissioning activities.

On the other hand, if the fuel cannot be removed from the site for lack of.

so'newhere to take it, the license cannot be terminated and there will be -

continuing costs for storage operations and security even after the otherT rt.dioactive raterials have been removed.

the_$2 to $3 million per year range.

If you The above information is about all I can do for you in an afternoon, need to explore any of these topics in more detail, please let me know, incerely,

. \e -

e

! Richard I. Smith, P.E. -

i Staff Engineer * '

' Waste Systems Department ,

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