ML20210T825
| ML20210T825 | |
| Person / Time | |
|---|---|
| Site: | 07002972 |
| Issue date: | 10/02/1986 |
| From: | Crow W, Ketzlach N NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| To: | |
| Shared Package | |
| ML20210T801 | List: |
| References | |
| NUDOCS 8610090219 | |
| Download: ML20210T825 (4) | |
Text
e.
OCT 0 2 E06 DOCKET N0:
70-2972 LICENSEE:
Commonwealth Edison FACILITY:
Byron Station, Unit 2
SUBJECT:
REVIEW 0F LICENSE AMENDMENT APPLICATION DATED SEPTEMBER 3, 1986, AND ITS REVISION DATED SEPTEMBER 23, 1986 I.
Background
Commonwealth Edison (CE), by application dated September 3, 1986, and its revision dated September 23, 1986, requested authorization to store the fuel assemblies under water in the Spent Fuel Storage Pool and to receive, store, and install two Cf-252 startup sources in two of the fuel assemblies. At the present time, the sources are being stored under the Byron Unit 1 operating license. The fresh fuel assemblies are stored dry in a checkerboard pattern in the Spent Fuel Storage Pool in accordance with SNM-1916 (Byron, Unit 2). When stored under water in the pool, CE requests the use of all storage rack locations (not to be limited to a checkerboard pattern as in the dry storage).
II. Discussion A.
Radiation Safety Two Cf-252 startup sources (225 millicuries / source) are required.
Time, distance, and shielding will be used by CE personnel in handling and installing of the sources. Experience with the handling and installing the same size sources in the Byron Unit 1 assemblies indicates the personnel exposure for the entire operation would be less then 30 milli-manrem. This is far below the Station criteria to maintain personnel exposure below 200 milli-manrem during the source installation. Dose rates from the unshielded sources are projected to be 3.5 mrem /hr at 10m.
The sources are to be installed in the assemblies located in two damaged fuel storage containers filled with borated water. A third container between the two (on 22-inch centers), also filled with borated water, will be used as a temporary storage location for the primary source rods. Normal station radiation procedures will be used to support the movement of the sources.
Health Physics personnel will monitor personnel area dose rates, conduct area and contamination swipe surveys, and post any radiation areas.
Personnel dosimetry will include badges designed to measure neutron exposure.
With the authorized limits for personnel exposure and their control by Health Physics personnel, the planned operations for handling and installing the Cf-252 sources should be accomplished in a safe manner.
8610090219 861002 PDR ADOCK 07002972 C
OCT 0 21986 2
B.
Nuclear Criticality Safety The licensee requested authorization to utilize all storage locations in the Spent Fuel Storage Pool for fuel assemblies stored under water.
l Under these conditions, the maximum k of the array is less than 0.95.
In order to allow the storage of fuel *Nsemblies in all storage locations under water in the Spent Fuel Storage Pool at a maximum U-235 enrichment of 3.22 w/o and to continue authorization for dry storage in a checkerboard pattern, it is recommended that Condition 20 be revised as follows:
Condition 20: New Fuel Assemblies may be stored in the Spent Fuel Storage Pool subject to the following conditions:
a.
The maximum U-235 enrichment shall be 3.22 w/o for dry storage.
b.
New fuel assemblies, when stored in a dry condition, shall be stored in a checkerboard pattern.
c.
When new fuel is stored in a dry condition, the Fuel Handling Foreman shall verify correct fuel assembly location after insertion of each fuel assembly into the assigned storage rack in accordance with a prepared written procedure approved by an Operating Engineer and the Technical Staff Supervisor, d.
When new fuel is stored in a dry condition, an independent loading verification shall be made by a Quality Control Inspector.
e.
When new fuel is stored in a dry condition, the Fuel Handling Foreman and the Quality Control Inspector shall each sign a document assuring proper storage of each fuel assembly.
f.
When new fuel is stored in a dry condition, the fuel assemblies shall be protected to preclude damage and preserve fuel assembly cleanliness.
g.
New fuel may be present in the Spent Fuel Storage Pool while the pool is being flooded, provided that the checkerboard loading pattern is maintained until the pool is completely flooded.
Storage of fully flooded assemblies in the Spent Fuel Storage Pool, utilizing all storage locations, does not require boron in the water for nuclear criticality safety. The movement and storage of the new fuel assemblies is already authorized by the license and the amendment being issued. Therefore, there is no need for additional licensing action on the licensee's plans to use borated water in the pool and its methods for moving and storing the fuel assemblies.
i 3
OCT 0 21986 It is desired to install the Cf-252 startup sources in two assemblies while they are in water-filled fuel containers and the space between containers has no water (space is void). The water in the containers will have a boron concentration of at least 2,000 ppm for shielding. The assemblies will be spaced on 44-inch centers and will be 20 3/8 inches center-to-center from the nearest fuel assembly in the remaining fuel assembly array in the pool. This is greater than the minimum checkerboard center-to-center spacing between the assemblies in the dry storage array. The staff recommends Condition 29 be added to authorize the storage and placement of the startup sources in fuel assemblies.
Condition 29: Two fuel assemblies may be placed in two water-filled failed fuel containers (on 44-inch centers) for primary neutron source installation and shielded storage provided that the water has a baron concentration of at least 2,000 ppm. The failed fuel container between the two fuel assemblies shall also be filled with water having a boron concentration of at least 2,000 ppm.
C.
Environmental Effects There is no requested change to the environmental protection requirements for the facility. Neither the requested change to store new fuel assemblies under water in the Spent Fuel Storage Pool nor the installation of the Cf-252 startup sources in the fuel assemblies will result in (1) any significant change in the types of effluents that may be released offsite, (2) any significant increase in individual or cumulative occupational radiation exposure, (3) any significant construction impact, and (4) any significant increase in the potential for or consequences from radiological accidents. Therefore, in accordance with 10 CFR 51.22(c)(11),
neither an Environmental Assessment nor an Environmental Impact Statement is necessary for the proposed action.
D.
General The revised amendment applicatica dated September 23, 1986, was discussed with Mr. Julian Hinds, Senior Resident Inspector, Byron Unit 2 Facility, on September 25, 1986. He foresaw no safety or environmental problem with the requested authorization.
m
4 00T 0 21986 Conclusion Issuance of the amendment authorizing the storage of New Fuel Assemblies under water in the Spent Fuel Storage Pool and the receipt, possession, and installation of Cf-252 startup sources in two fuel assemblies is recommended.
'Driginal Signed By:
Norman Ketzlach Uranium Process Licensing Section Uranium Fuel Licensing Branch Division of Fuel Cycle and Material Safety
- ""18I "d Df 8
Approved by:
W. T. Crow, Section Leader OFC:FCUP a/
- FCUF
- FCUP 4
GLW:- --- -.................... - -
NAME:NKetzlach:ht
- VLT
- WTCrow DATE:09Aw3/86
- 09/30/86
- dW7 '7/86 0FFICIAL RECORD COPY