ML19331C655
| ML19331C655 | |
| Person / Time | |
|---|---|
| Site: | Fort Calhoun  |
| Issue date: | 07/07/1980 |
| From: | William Jones OMAHA PUBLIC POWER DISTRICT |
| To: | Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| References | |
| IEB-80-11, NUDOCS 8008190271 | |
| Download: ML19331C655 (4) | |
Text
bec to DAC:ADM:
CENTRAL FZLES 3
ip PDR:HQ
.L LPDR
' p [ TIC
.J Omaha Public Power District 1623 MAANEY
- O M A H A.
NESRASMA 68102 TELEPHONE 536-400C 4
July 7, 1980 Mr. K. V. Seyfrit, Director U.S. Nuclear Regulatory Commission Office of Inspection and Enforcement Region IV 611 Ryan Plaza Drive Suite 1000 Arlington, Texas 76011
Reference:
Docket No. 50-285
Dear Mr. Seyfrit:
The Omaha Public Power District received IE Bulletin 80-11, dated May 8, 1980, regarding masonry wall design. Accordingly, attached hereto is the District's response to items 1, 2a and 3 of the bulletin.
A final report summarizing the details and results of the masonry wall re-evaluation program will be submitted as required by the bulletin.
Sincerely, i,,' m
\\,3D, E W. C. Jones Division Manager Production Operations WCJ/KJM/PRT: cal Attachment cc:
U.S. Nuclear Regulatory Comission Office of Inspection & Enforcement Division of Reactor Operations Inspection Washington, D. C.
20555 LeBoeuf, Lamb, Leiby & MacRae 1333 New Hampshire Avenue, N.W.
Washington, D.C.
20036
,8008190 27/
ATTACHMENT Response to Items 1, 2a, and 3 of IE Bulletin 80-11 Reouest 1 Identify all masonry walls in your facility which are in proximity to or have attachments from safety-related piping or equipment such that wall failure could affect a safety-related system.
Describe the system and equipment, both safety and non-safety-related, associated with these masonry walls.
l
Response
Forty-two (42) masonry walls have been identified at the Fort Calhoun Station and are summarized in Table 1.
None of the walls described directly support any safety-related equipment; t. owe,er, some lightweight non-safety-related equipment is supported by these walls. All of the masonry walls are interior walls located within the Auxiliary Building and do not functicn as load bearing walls or walls designed to restrict relative movement.
Safety-related systems and equipment in proximity to these walls include:
1.
Comporent cooling water piping (penetrates through wall only).
2.
Component cooling water heat exchangers 3.
Shutdown cooling heat exchangers 4.
Charging pumps 5.
Letdown heat exchangers 6.
Spent fuel pool heat exchangers 7.
Waste gas compressors 8.
Primary sampling system 9.
Hydrogen purge system
- 10. Gas decay tanks 11.
Raw water supply piping for redundant supply to bearing water cooler for the safety injection pumps 12.
Instrument air header
- 13. Nitrogen gas lines for blanketing of various tanks, the waste gas compressor and gas stripper 14.
Batteries
- 15. Cable trays and conduit
- 16. Motor control centers
- 17. Control room panels Analyses to determine the effect of wall failure on safety related equipment identified as being in proximity to these walls will be performed during the District's re-evaluation program.
l Non-safety-related systems and equipment in proximity to these walls include:
1.
Demineralized water piping 2.
Auxiliary steam line for waste evaporator 3.
Ductwork for hydrogen gas removal system
4.
Ventilation ductwork 5.
Potable water piping 6.
Compressed air lines 7.
Cable trays and conduit 8.
Lighting panels and fixtures 1
9.
Motor control centers
- 10. Local control stations
- 11. Control room panels
- 12. Site security concentrator 13.
Local control stations Request 2a Establish a prioritized program for the re-evaluation of the masonry walls.
Provide a description of the program and a detailed schedule for completion of the re-evaluation for the categories in the program.
Response
To date, the District has completed an extensive investigation of the physical characteristics of all masonry walls.
This effort has included:
1.
Field measuring wall configurations and verifying the existence and location of reiaforcing using an electronic reinforcing detector.
2.
Mappinc of all Type I and II walls (as described in Table 1) by means i
of drr <ings made showing the walls and location of all safety-related equipnn in proximity to these walls.
3.
Review of the original construction specifications to determine the 1
properties of the masonry units, reinforcing steel and mortar.
4.
Photographing of all the walls.
The schedule for completion of the masonry wall re-evaluation program is provided in the attached Table 1.
Request 3 j
I Describe in detail the actions planned and their schedule to justify the re-evaluation criteria used in Item 2.
l
Response
Because all the masonry walls are single wythe type, the District does not l
anticipate having to perform a confirmatory masonry wall test program.
Existing test data and the use of conservative assumptions applicable for l
actual plant conditions will be used to justify the re-evaluation acceptance criteria in addition to the design criteria set forth in the latest revision l
of the 1976 edition of the Uniform Building Code.
1 i
The schedule for completion of the re-evaluation program at the Fort Calhoun Station is provided in the attached Table 1. !
i
Table 1.
Summary of Masonry Walls at the Fort Calhoun Station
~
RE-EVALUA' TION TYPE DESCRIPTION USE QUANTITY COMPLETION DATE I
Vertically reinforced single,wythe 1.
Perimeter and divider hollow concrete masonry units with walls for the two bat-mortar tery rooms 4
2nd week in October II Vertically unreinforced single wythe 1.
Perimeter wall and parti-hollow concrete masonry units with tion for control room mortar 4
1st week in October 2.
Major corridor in Auxil-iary Building and office partition 3
Mid-September 3.
Wall surrounding elevator shaft and stairway passing thru cable spreading room 6
3rd week in October III Solid concrete units stacked with 1.
Shield walls used to close no nortar openings in reinforced con-crete walls 20 4th week in October n