ML19291C353
| ML19291C353 | |
| Person / Time | |
|---|---|
| Site: | Fort Calhoun  |
| Issue date: | 12/07/1979 |
| From: | William Jones OMAHA PUBLIC POWER DISTRICT |
| To: | Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| References | |
| IEB-79-02, IEB-79-2, NUDOCS 8001240269 | |
| Download: ML19291C353 (6) | |
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, ; e STATE Omaha Public Power District 1623 MARNEY Q M A H A.
NESRASMA 68102
- ELEPHON E 536 4000 AREA CODE A02 December 7, 1979
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U. S. Nuclear F.egulatory Cc--dssion Office of Inspection and Inforcement
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611 Ryan Plaza Drive Suite 1000 Arlington, ':exas T6011
Reference:
Dceket No. 5C-265
Dear Mr. Seyfrit:
The C=aha Fublic Fever Distri : received II Sulletin 79-02, Revision 2, dated Novenber 3, 1979, which recuested ths; certain infer:ation be provided in regard to Fort Calheun Staticn pipe su nor; base : late desiens using cencrete ex ansion ancher bolts.
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Accordingly, the requested information is provi?.ed by attachnent
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.-.- a Sincerely,
'4. C. Jones Division Manager Freductica C;erations n uu i..u.-- - < y -,4 / 2 u-.:...
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U. S. Nuclear Regula:Ory 00--4ssion Office Of Inspection = ' 7 '---=~aa-Division of Reac Or Operations Inspection
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20535 Le3ceuf, Lamb, leiby L :4acRae 1333 New Es=pshire Avenue, N.
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20036 1795 115 CP 8001240
Revised 12-7-79 The evaluation of the adequacy of the anchor bolt installations of those supports which use structural steel shapes anchored by concrete expansion anchor bolts will be included in the field inspection program.
Since the quality of anchor bolt installation is with-out prejudice to either "baseplates" or " structural steel shapes" the measure of installation quality would most likely be the same in either case.
Based on current testing of base plates and associated anchor bolts there is a 7% pull test failure rate of anchor bolts.
Hence, we can expect a similar failure rate when testing anchor bolts associated with structural shapes but fewer failures since the number of struc-tural shapes is much smaller than the the number of baseplates (232 vs. 1894).
- c. ) The District will plan and schedule the inspection and analysis of these structural steel shapes using con-crete expansion anchor t'olts in the inaccessible area to be complete prior to the end of the next extended outage (March 15, 1980).
The inspection and analysis of these structural steel shapes using concrete expan-sion anchor bolts in the accessible area will be com-pleted prior to the next refueling outage (January 14, 1980).
This action will assure that the affected systems will meet Technical Specifications operability requirements in the event of an SSE.
1795 1,..
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1.
Request for Infortation (Item 8)
" Describe any instances not previously reported, in which you did not meet the revised (R2) sections of Items 2 and 4 and, if necessary, your plans and schedule for resolution."
Response
There are no such instances.
2.
Reouest for Information (Item 8)
"All holders of operating licenses for power reactor facilities are requested to complete Items 5, 6, and 7 within 30 days of the date of issuance of Revision No. 2."
Response
Item 5:
Concrete expansion anchor bolts were not used in concrete block walls.
Item 6:
Concrete expansion anchor bolts were used to anchor 232 structural steel shapes directly to concrete.
These anchor bolts and structural steel shapes have not yet been included in the actions performed for the Bulletin.
- a. ) A list of the systems involved, with the number of supports, type of anchor bolts, line size, and accesi-bility of a support during normal plant operation is provided in Tables 1 and 2.
b.) A detailed evaluation of the adequacy of the anchor bolt design and installation is in progress at this time.
The evaluation of the adequacy of the original anchor bolt design with structural shapes is following the same course of action as did the anchor bolt design with baseplates.
This consists of the following tasks:
1.
Request information from the pipe support designer (Bergen-Paterson Pipe Support Corporation) regard-ing the design criteria used at the time for structural shapes anchored to concrete using concrete expansion anchor bolts.
2.
Where documentation of the original design does not exist, the District will perform an analysis of the support structure to determine the load (s) on the concrete expansion anchor bolts.
These load (s) will include the effects of prying action due to flexibility of the stAel shapes and an assumed distribution of the applied load (s) on the anchor bolts.
1795 117.
Revised 12-7-79 Item 7:
The following schedule details the completion dates for IE Bulletin 79-02, Rev. 2, Items 1, 2, and 4:
Scheduled Item Description Completion Date 1
Verification that " base plate" Accessible areas and " structural steel shape" will be completed flexibility was accounted for in prior to the next the calculation of anchor bolt refueling outage loads.
(approximately Janaury 14, 1980).
Inaccessible areas will be completed prior to returning the plant to ser-vice following the January, 1980 refueling outage (approximately March 15, 1980).
2 Verification that concrete Accessible areas expansion anchor bolts have will be completed a specified minimum factor of prior to the next safety between bolt design refueling outage load and the bolt ultimate (approximately capacity.
January 14, 1980).
Inaccessible areas will be completed prior to returning the plant to ser-vice following the January, 1980 refueling outage (approximately March 15, 1980).
3 Verification of proper Accessible areas installation by conducting will be completed a testing program.
Includes prior to the next both accesible and refueling outage inaccessible.
(appro.ximately Janaury 14, 1980).
Inaccessible areas will be completed prior to returning the plant to ser-vice following the 1795 t j 8 January,1980 iI refueling outage (approximately March 15, 1980)..
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TABLE 1 General Summary or System Supports Using Structural Steel Shapes and Concrete Expansion Anchor Bolts Ouantity of System Suocorts System Usina Structural Shapes Auxiliary Coolant 59 Chemical Volume & Control 21 Feedwater 20 Fire Protection 0
Raw Water 25 Reactor Coolant 4
Safety Injection 30 Vent Orain 0
Waste Disposal 65 TOTAL 232
'l795 I19'
4 TABLE 2 Detailed Summary of System Supports Using Structural Steel Shapes and Concrete Expansion Anchor Bolts NOTES:
1.
Anchor Bolt Types designated "shell" are ITT Phillip's Red Head "S" type.
2.
Anchor Bolt Types designated " stud" are ITT Phillip's Red Head "JS" type.
3.
Loads indicated are the pipe reaction in pounds.
1795 120.