ML20010J443
| ML20010J443 | |
| Person / Time | |
|---|---|
| Site: | 07002944 |
| Issue date: | 08/31/1981 |
| From: | DUKE POWER CO. |
| To: | |
| Shared Package | |
| ML20010J442 | List: |
| References | |
| 19618, NUDOCS 8110050081 | |
| Download: ML20010J443 (2) | |
Text
~
e auxiliary hoist of the fuel handling bridge crane. Upon removal from the shipping container the assembly is placed in the new fuel inspection hatch or is transported by the auxiliary hoist to the New Fuel Storage Vault or the spent fuel pool for storage. Fuel is transferred from the vault to the spent fuel pool in a similar manner.
1.
New Fuel Storage Facility The design of the new fuel facility is based on the following criteria:
General Design Criterion 2 - Design for protection egainst natural phenomena; General Design Criterion 3 - Fire Protectiun; General Design Criterion 4 - Environmental and missile design bases; General Design Criterion 5 - Sharing of structures, systems and components; General Design Criterion 61 - Fuel storage, handling, and radioactive control; Capability of periodic inspection; u.
b.
Shielding for radiation protection; c.
Provisions for containment and confinement; General Design Criterion 62 - Prevention of criticalicy in fuel storage and handling; ANSI N18.2-1973, Section 5.7.4.1; "The design of spent fuel storage racks and transfer equipment shall be such that the effective multiplication factor will not exceed 0.95 with new fuel of the highest anticipated enrichment in place assuming flooding with pure water. The design of normally dry new fuel storage racks shall be such that the effective multiplication factor will not exceed 0.98 with fuel of the highest anticipated enrichment in place assuming optimum moderation (e.g.,
a uniform density aqueous foam envelope as the result of fire fighting). Credit may be taken for the inherent neutron absorbing effect of materials of construction or, if the requirements of Criterion 5.7.5.10 are met, for added nuclear poisons."
Regulatory Guide 1.29 The above criteria are identical to the criteria used in the design of the Unit 1 New Fuel Storage Vault. Each unit at McGuire Nuclear Station 2
has new fuel storage racks located within a New Fuel Storage Vault.
Both the New Fuel Storage Vault and the new fuel storage racks are designed as Category 1.
n110050081 010831' PDR ADOCK 07002944 Rev. 2 C
~
There are normally no combustible materials present in the storage vault ~. A manual fire fighting system of appropriate capacity and capability is present should combustible material be inadvertently introduced.-
Ventilation for this facility is provided by the fuel handling area ventilation supply and the fuel handling area ventilation cy.haust subsystems.
2.
Spent Fuel Storage Facility The_ design bases of the-spent fuel storage facility which are identical 9
~
to those for Unit 1 are the following:
The prevention of criticality during storage.
.The prevention of damage of the fuel.
Adequate radiation shielding.
Protection against radioactivity release.
Adequate monitcring of the fuel storage.
Ability to withstand design seismic loads.
The fuel assemblies are held in a vertical position by the spent fuel pool storage racks. The fuel assemblies ere supported within the fuel storage racks by a stainless steel plate located six inches above the fuel pool floor. Stainless steel plates which cover the top of each i
storage rack are positioned over those storage racks which contain new fuel assemblies.
The fuel racks are constructed using stainless steel plates. The four sides of the fuel rack are 1/8 inch stainless steel plate. A 1/4 inch plate, with a 51/2 inch diameter hole in the center is welded to the sides of the fuel rack for support of the fuel assembly.
The_ support plate is located 6 inches above the pool floor. An open-ing of not less than 12.5 square inches is provided in each side of the fuel rack and located below the fuel assembly support plate. A lead-in assembly is provided at the top of each rack for ease of insertion of the fuel assembly.
In order to maintain the racks in a vertical position, the bottom and top of each rack is supported laterally against the fuel pool wall by a gridwork of structural steel shapes and plates shich are welded to the fuel racks. For each unit, there are 500 fuel assembly storage racks for spent fuel with a center to center spacing of 15 1/2 inches.
2 Administrative procedures require that new fuel assemblies stored dry
'in the. spent fuel pool be stored in a checkerboard array such that, for a given assembly, the four diagonally adjacent locations contain an assembly, and the four immediately adjacent storage locations are vacant. This checkerboard array insures that no two fuel assemblies I
will be closer than the 21 inch center-to-center spacing of the New 19S18 Rev. 2 L
1/
J