ML20170A400

Independent Spent Fuel Storage Installation Updated Decommissioning Safety Analysis Report, DSAR 5.8, Rev. 0, Structures Missile Protection

ML20170A400
Person / Time
Site:	Fort Calhoun, 07100256
Issue date:	04/30/2020
From:	Carlson J Omaha Public Power District
To:	Office of Nuclear Reactor Regulation, Office of Nuclear Material Safety and Safeguards
Shared Package
ML20170A380	List: LIC-20-0005, Independent Spent Fuel Storage Installation, Technical Specification Basis ML20170A382 ML20170A383 ML20170A384 ML20170A385 ML20170A387 ML20170A388 ML20170A389 ML20170A390 ML20170A391 ML20170A392 ML20170A393 ML20170A394 ML20170A395 ML20170A396 ML20170A397 ML20170A398 ML20170A399 ML20170A400 ML20170A401 ML20170A402 ML20170A403 ML20170A404 ML20170A405 ML20170A406 ML20170A408 ML20170A409 ML20170A410 ML20170A411 ML20170A412 ML20170A414 ML20170A415 ML20170A416 ML20170A417 ML20170A418 ML20170A419 ML20170A420 ML20170A421 ML20170A422 ML20170A423 ML20170A424 ML20170A425 ML20170A426 ML20170A427 ML20170A428 ML20170A429 ML20170A430 ML20170A431 ML20170A432 ML20170A433 ... further results
References
LIC-20-0005
Download: ML20170A400 (5)

Text

Page 1 of 5 DSAR-5.8 Structures Missile Protection Rev 0 Safety Classification: Usage Level:

Safety Information Change No.: EC 69283 Reason for Change: The contents of this section associated with internal missiles, turbine blade creating a missile, and pipe whip have been removed since they are no longer applicable during decommissioning.

Preparer: J. Carlson Fort Calhoun Station

DSAR-5.8 Information Use Page 2 of 5 Missile Protection Rev. 0 Table of Contents 5.8 Missile Protection ......................................................................................................... 4 5.8.1 External Missiles ................................................................................................ 4 5.8.1.1 Tornado Generated Missiles ................................................................. 4

DSAR-5.8 Information Use Page 3 of 5 Missile Protection Rev. 0 List of Tables Table 5.8 DBT Missile Spectrum and Maximum Horizontal Speeds .................................. 4 Table 5.8 Design Basis Tornado Characteristics ............................................................... 4

DSAR-5.8 Information Use Page 4 of 5 Missile Protection Rev. 0 5.8 Missile Protection 5.8.1 External Missiles 5.8.1.1 Tornado Generated Missiles The spectrum of hypothetical missiles used for the design basis analysis are described below in Table 5.8-1. The associated design-basis tornado (DBT) characteristics are described below in Table 5.8-3. The criteria shown in Tables 5.8-1 and 5.8-2 are taken from Regulatory Guide (RG) 1.76, Revision 1. Per RG 1.76, Revision 1, Fort Calhoun Station is located in Region I of the United States where at the 10-7 per year probability level, the DBT is comprised of 230 mph winds with a concurrent pressure drop of 1.2 psi at a rate of 0.5 psi per second. The horizontal velocity component of tornado generated missiles is applied in all horizontal directions and where applicable, the vertical velocity component is equal to 67% of the horizontal velocity. Required equipment installed external to Class I structures must be protected by appropriate barriers or analyzed to ensure that equipment remains available. Required equipment installed inside Class I structures are protected by the structure or installed barriers.

Table 5.8 DBT Missile Spectrum and Maximum Horizontal Speeds Horizontal Item Weight (lbs) Velocity (fps)

Sched 40 Pipe (6.625" dia x 15' lg) 287 135 Automobile (16.4'x6.6'x4.3') 4000 135 Solid Steel Sphere (1" dia.) 0.147 26

(

Reference:

Table 2 of RG 1.76, Revision 1)

Table 5.8 Design Basis Tornado Characteristics Region Maximum Translational Maximum Radius of Pressure drop Rate of Wind Speed Speed (mph) Rotational Maximum (psi) Pressure (mph) Speed (mph) Rotational Drop (psi/s)

Speed (ft)

I 230 46 184 150 1.2 0.5

(

Reference:

Table 1 of RG 1.76 Revision 1)

DSAR-5.8 Information Use Page 5 of 5 Missile Protection Rev. 0 The Atomic Energy Commission (AEC) approved Bechtel Topical Report BC-TOP-9A, "Design of Structures for Missile Impacts,"

Revision 2, which was used to evaluate the spectrum of missiles described in Table 5.8-1 against the SSCs to which they are being applied. (Reference 5-16)

RG 1.76 Revision 1 and Bechtel Topical Report BC-TOP-9A, Revision 2, comprise the methodology used to assess structures, systems and components for the DBT and associated missile impacts.