ML18038B351

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Trip Rept of 950514-16 Visit to Browns Ferry Nuclear Power Stations Re Blast Evaluation & Subsequent Vehicle Barrier Location
ML18038B351
Person / Time
Site: Browns Ferry  Tennessee Valley Authority icon.png
Issue date: 06/06/1995
From: Nebuda D
ARMY, DEPT. OF, CORPS OF ENGINEERS
To:
ARMY, DEPT. OF, CORPS OF ENGINEERS
Shared Package
ML18038B348 List:
References
CEMRO-ED-ST, NUDOCS 9507250301
Download: ML18038B351 (7)


Text

CEMRO-ED-ST 6 Jun 95 MEMORANDUM FOR RECORD

SUBJECT:

Trip Report for Visit to Browns Ferry Nuclear Power Stations 14 16 May 95

1. I arrived at Huntsville, AL, the afternoon of 14 May. No business was conducted on this day.
2. On the morning of 15 May, I proceeded to the Browns Ferry Nuclear Plant (BFNP). At BFNP I met with the individuals from Tennessee Valley Authority (TVA) listed in enclosure 1 for an entrance briefing.
3. After the entrance briefing I met with the Nuclear Regulatory Commission resident inspectors to explain the purpose of my visit.
4. Messrs. Locke, Enis, Jansen, and Golub then escorted me on a tour of the site. Particular attention was given to the intake pumping station because of concerns regarding the blast evaluation and subsequent vehicle barrier location.
5. After the site tour Mr. Enis, Mr. Locke, and myself discussed the site drawings, construction detail drawings, and blast analysis. Of particular interest to TVA was their blast analysis of the intake pumping station using the CONWEP computer program.

My observation was that TVA was using the CONWEP program properly and their implementation of the results was consistent with good engineering practice. Subsequent analysis that I have performed show that the pressures inside the intake pumping station are at sufficiently low levels so as not to interrupt the operation of the equipment when a standoff distance of at least 100 feet is maintained. My overall impression is that the planned elements of the vehicle barrier system(VBS) are capable of stopping the design basis vehicle, and the location of the VBS will mitigate damage caused by the design basis bomb to an acceptable level.

It is also my opinion that configuration of the cabled barriers side of the protected area will result to the terrain on the west in adequate vehicle stopping capacity.

6. Also discussed was a list of questions faxed to me on 3 May (see enclosure 2). My response to these questions is as follows.
a. Question a1. Sketch 2 is correct.
b. Question a2. Yes.
c. Question a3. If a fixed condition is used for a bollard, such as a 2 foot diameter by 4-foot-deep concrete footing, soil data. Detailed it soil is not necessary to consider surrounding 9507250301 950b29 PDR ADOCK 05000259 P PDR

CEMRO-ED-ST

SUBJECT:

Trip Report for Visit to Browns Ferry Nuclear Power Stations 14 16 May 95 property investigation is not required, only general classification of the soil in vicinity. This classification may be based on previous soil testing.

d. Question a4. Sag of up to 7 inches is acceptable as long as the height of the centerline of the cable group remains between 29 and 36 inches.
e. Question a5. No.
f. Question a6. Yes, use typical local practice.
7. On 16 May I returned to Omaha.
8. If anyone has questions regarding this trip report, please contact me at (402) 221-4914.

DALE T NEBUDAI P E~ ~

Structural Engineer 2 Encls

REGULATORY LICENSING MEETING ATTENDANCE LIST

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