ML19338F259
| ML19338F259 | |
| Person / Time | |
|---|---|
| Site: | Dresden, Quad Cities  |
| Issue date: | 02/15/1973 |
| From: | Brian Lee COMMONWEALTH EDISON CO. |
| To: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| Shared Package | |
| ML19338F257 | List: |
| References | |
| TASK-06-04, TASK-RR NUDOCS 8010140653 | |
| Download: ML19338F259 (2) | |
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POST OFFICE SOX 747
- C H 4 C A G O, ILtlNOt3 e0490 February 15, 1973 Mr. Boyce H.
Grier, Regional Director U.
S.
Atomic Energy Commission Directorate of Regulatory Operations Region III 799 Roosevelt Road Glen dllyn, Illinois 60137
Dear Mr. Grier:
Your letter of June 29, 1972 requested verification that valves-important to safety installed or to be ins t alle d at our Zion, Qu ad-Ci ti e s and Dresden facilities met minimum wall thickness requirements specified by applicable codes, standards and procurement specifications.
We responded on August 1W, 1972.
on September 13, 1972, you requested more information.
Following an industry meeting in Washington at which the subject was discussed, we submitted a program for
'our Zion Station on December 22, 1972.
The inspection of Unit 1 valves is nearing completion.
All' valves six inches and larger (120 valves) have been checked and meet design specifications.
Inspection of 86 of the 161 valves under six inches has been completed and all were found to be acceptable.
The' inspection of Unit 2 valves is now in progress and 44 valves have been completed.
In our letter of August 14, 1972, w e described a program based on ultrasonic testing of a sample of the valves important to nuclear safety in our Quad-Cities Unit 2.
I!o deficiencies were found in that review either.
We believe this type of program gives reasonable assurance that required valve wall thicknesses have been maintained for such valves in both the Quad-Cities units and in Dresden Station Units 2 and 3
We chose this program because we believe the benefits gained by field testing all valves in an operating plant were outweighed by the costs of providing this additional. data.
We estimate at least 50 man-rem per unit exposure will be received by employes, on the a've r ag e, for each of the four units involved.
_t e radiation burden involved in doing the tests on Dresden Unit.1 is estimated to be at least several times that for any
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C6mmonwealth Edison Company"
-Mr.
Boyce H.
Grier 2-February 15, ~1973 one of our other four operating BWR units.
Using available data, we estimate the radiation dose involved in testing 27
.of the 116 valves involved to.be 143 man-rem of exposure.
We believe this exposure'is inconsistent with the policy of keeping exposures as low as' practicable.
We are presently.formulatin6 a program for.our five operating units ' cased on our experience to date and the potential exposure problems relating to operating reactors.
We expect to have this program formalized and submitted'to you by the end of March.
Very truly yours, 001 l'
Byron Lee, Jr.
Assistant to the President t
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