ML19224C109
| ML19224C109 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 04/24/1979 |
| From: | Dubiel R Metropolitan Edison Co |
| To: | Herbein J Metropolitan Edison Co |
| References | |
| NUDOCS 7906290022 | |
| Download: ML19224C109 (2) | |
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&Mw Subject UNIT-2 PRIMARY SYLTEM SAMPLE SYSTEM Location TMI Date April 24, 1979 To J. G. Herbein The existing physical arrangement which locates the Unit-1 cnd Unit-2 sampling sinks in the sate room has caused serious impact on the ability to continue routine sa=pling of Unit-1 systems and has handicapped the movement of personnel into the Auxiliary, Fuel Handling and Reactor Buildings of Unit-1.
The major impact due to drawing Unit-2 samples has been:
(1) Radiation (a)
In the sample room, the sinks are situated back-to-back, with all valve line-uis made between the sinks.
Due to the space between sample sinks, only a mini =al amount of shielding can be installed resulting in levels significantly higher than nor=al.
Other p'_ ping in the room is more accessible for scre adequate shielding, but will still contribute to increased radiation levels.
(b) Fuel Receipt area radiation levels will be much higher than normal due to the unshielded sample lines.
Levels as high as 50 nr/hr exist as far away as the fuel building stairs, approximately 60 f eet from the sample lines.
A large amount of shielding on the lines will be required to reduce levels such that unrestricted access can be provided to the area.
Additionally, all normal access to the Auxiliary Building is alone the North wall of the Fuel Recaipt Area, directly under the sample lines, where levels are as high as 1 R/hr, even with some existing shielding provided by 1 cad blankets.
(c? The Reactor Building entry and the Hot Machine Shop areas are also affected by the sample lines and will remain inaccessible unless a significant amount of shielding can be installed. The sample line run through the Hot Machine is at the lowest sample line elevation prior to entering the sample room resulting in the closest proximity to personnel.
Due to the confined area, it would be very difficult to shield the lines such that unrestricted access could be provided to the Hot Machine Shop or the Reactor Building Personnel Access Hatch Area.
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[O - 39,Q IfdTER-OFFICE MEMORAfJDUM C
J. G. Herbein Unit-2 Primary System Sample System Page 2
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(2)
Contamination (a) Airborne contamination has resulted each time a primary sample has been drawn frem Unit-2.
Due to the iodine levels in coolant, significant airborne levels have existed in the Sample Room and the Hot Chemistry Lab.
A tent has been
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constructed at the Chem Lab entrance to preclude airborne problems in the entire HP Lab - Count Room - Secondary Lab area.
Access to the Hot Chemistry Lab area is restricted for several hours following Unit-2 sampling, and than only with respiratory protection.
(b)
Surface contamination levels throughout the Sample Lab and Hot Che Lab have also resulted following each sample as a result of the airborne activity settling out.
Three to four hour clean-up efforts have been required just to maintain reasonable contamination levels.
Prior to being able to support Unit-1 under normal operations at any time during the next several months, I believe it is imperative that the Unit-2 sampling system be relocated and all of the existing lines flushed.
Both from a chemistry and an operation and =aintenance standpoint, support of Unit-1 would be impossible without high personnel exposures, as well as frequent exposure to airborne activity.
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R. W. Dubiel Supervisor, Radiation Protection and Chemistry RWD:chr es
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