ML19340B403
| ML19340B403 | |
| Person / Time | |
|---|---|
| Site: | Dresden  |
| Issue date: | 12/29/1977 |
| From: | Grimes B Office of Nuclear Reactor Regulation |
| To: | Goller K Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML19340B404 | List: |
| References | |
| FOIA-80-550 NUDOCS 8010220710 | |
| Download: ML19340B403 (2) | |
Text
--..__
/
=
si L
DEC 2 91977 P
.m HEMORANDUM FOR:
K. Goller, Assistant Director for Operating Reactors, DOR
~ ~ ",_
FROM:
B. Grimes, Chief, Envimnmental Evaluation Branch, D0R f.
SUBJECT:
DRESDEN UNIT 1 DECONTAMINATION Q::
This memo documents the resolution of most of the EEB questions regarding the
[j v:gi; Dresden Unit 1 decontamination. As discussed below, two questions should be p=
fomally transmitted to the licensee.
In addition, PSB should review the ade-quacy of the fire protection provisions for the binder in the solidification
- =
process (Item 3 of enclosure 2).
g i
H.
On December 15, 1977 members of the Envimnmental Evaluation Branch, their PNL h
consultants and project nanager, Paul O'Connor, met at the Dresden site to re-view their radiological and environmental questions (enclosure 1) with Common-wealth Edison eersonnel and their consultants (see attendance list A) concern-ing the Chemical Decontamination Program at Dmsden 1.
The group also toured the Chemical Cleaning Building, portions of which were in the latter stages of construction. Unfortunately, the Dresden 1 containment was not available for
._F observation as planned. Considerable progress was made in answering our con-cerns.
In early January Conconwealth Edison intends to submit for licensing rsview a document which will describe the entire chemical decontamination pro-c gram.
In particular, we understand that the document will address Commonwealth Edison's occupational exposure programs, environmental programs and details of
' = =
the Chemical Cleaning Building. Such a submittal, based on their presentation at the site and our understanding of what will be presented, should elimincte the majority of our concerns.
i is a question by question response and verbal resolution of the concerns raised in Enclosure 1.
The licensee's forthcoming submittal should 4
document their verbal resolutions of the concerns. Of the n4eteen questions raised, only two mmain unresolved at this time and should te formally sent to b
the licensee. They involve questions on the transuranic c6ntent of the wastes and detection of pure beta emitters (e.g. Fe-55 and Ni-63) in plant effluents 1
during and following decontamination operations. Questions 1 and 15 of enclo-sure 1, respectively.
It was obvious from reviewing the remaining 17 questions F
that considerable attention had been focused on maintaining occup&tional expo-
~
sures for the chemical cleaning as low as reasonably achievable.
1..
On December 16, 1977 R. Zavadoski of Environmental Evaluation Branch and Kelvin m9 Soldat and Bob Clark of PNL visited Catalytic, Inc. in Philadelphia (see atten-dance list B) to review in detail a model of the Chemical Cleaning Building pre-
[
pared by Catalytic for Comonwealth Edison.
It was obvious from the model that r
R considerable attention was given to radiation protection of workers fmm an en-W gineering viewpoint, i.e.1) all major components were separated and shielded. 4 fron each other, 2) clean util' ty service pi ping and electrical trays were f,
0 omc s 9-80102247/O C
/
.....s,.
==
o.,Cgrnact: R.Zavadoski
_4 NRC FORM 318 (9 76) NRC 0 W us s. oovanmuswr yn'envine' orricts se7e - eae.ed
l 4
[g
~*
b DEC 2 91971, separated as much as possible fmm piping carrying radioactive fluids, 3) ex-tensive use of reach rods was made both for control and overrides on valving,
=1
- 4) each hot component had the built-in capability of being flushed and/or drained prior to routine or unanticipated maintenance, 5) ten diameter bends were used on all msin sluicing lines and finally, but by no means completing
- z. =
the list, 6) even radiation monitors and step-off pads were evident in the 3=*
model. Comonwealth Edison personnel emphasized that project engineers, health physicists and designers worked together on this project right from the layout and ' ',ign stage. The results were obvious.
Catalytic also prepared a model of the Dresden 1 sphere (the model is presently at Dow, Midland, Michigan, but large scale photographs were reviewed which de-
=
tail:all the connections which will be necessary to perform the chemical clean-ing operation).'From both models and the operational procedures already devel-oped, Commonwealth Edison and their consultants have prepared a detaild! estimate
~
of the man-rem exposures for the entire chemical cleaning job. Their estimate is approximately 550 man-rem. Comonwealth Edison intends to review in detail, with M
the contractor selected to do the job, methods which could be employed- (i.e.
temporary shielding, special tools, etc.) to reduce the exposures. They have confidence that such a review will lead to reduced exposures. Comonwealth Edison will frequently monitor the exposures during the job and will compare the final reults with the estimate after the job is complete. Obviously. ALARA is being seriously taken into consideration.
Original Signed by.
Brian E. Grimes j Brian K. Grimes, Chief l
Envimnmental Evaluation Branch Division of Operating Reactors
Enclosures:
As stated cc:
V. Stello DISTRI!!UTION D. Eisenhut Central files J. Collins EEB Rdg W. Kreger BGrimes b
T. Murphy RZavadoski
[
J. Kastner LBarrett t
D. Dilanni EAdensam i
F. Almeter JGuibert E. Adentam RCudlin D. Davis PDR L. Shao R. Vollmer R. Baer W. Butler 1.[
R. Emch 4
o ro-,e n n
/?
EEBlg0R EE Dgg EEIM90R /
o,, c.
7 RZavafski;j h
'.L o-EAdensam
.u....,.
.12/nJ1L..
-.124ty.J77....
3 2 f. M J 1 L.
.12/f))]7__
P
- g
' 9
' 3' nac rosi.x 3:s <9 76> nacx o24o
- u2...ove.
ve..~ri o o,,e
..r.-..
J dJu os1 l
..