ML19320D604
| ML19320D604 | |
| Person / Time | |
|---|---|
| Site: | Maine Yankee |
| Issue date: | 06/30/1980 |
| From: | Groce R, Johnson W Maine Yankee |
| To: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| IEB-80-11, WMY-80-103, NUDOCS 8007210601 | |
| Download: ML19320D604 (5) | |
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617-366-9011 June 30, 1980 B.4.1.1 WMY 80-103 United States Nuclear Regulatory Commission Office of Inspection and Enforcement Region I 631 Park Avenue King of Prussia, Pennsylvania 19406 Attention:
Mr. Boyce H. Crier, Director
References:
(a)
License No. DPR-36 (Docket No. 50-309)
(b) USNRC Letter to MYAPC dated May 8, 1980; IE Bulletin No. 80-11 Subjec*:
Response to IE Bulletin No. 80-11 " Masonry Walt Design"
Dear Sir:
Your letter, Reference (b), identified a problem with the s::ructural integrity of concrete masonry walls, and requested that Maine Yankee respond to those actions delineated in your letter.
Attached hereto is Maine Yankee's response to Items 1, 2a and 3 of the subject bulletin.
We trust this information is satisfactory; however, should you require additional information, please contact us.
Very truly yours, MAINE YANKEE ATOMIC POWER COMPANY W. P. Johnson, Vice President COMMONWEALTH OF MASSACHUSETTS)
)ss COUNTY OF WORCESTER
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Then personally appeared before me, W. P. Johnson, who, being duly sworn, did state that he is a Vice President of Maine Yankee Atomic Power Company, that he is duly authorized to execute and file the foregoing request in the name and on the behalf of Maine Yankee Atomic Power Company, and that the statements therein are true to the best of his knowledge and belief.
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ATTACHMENT Item 1:
Table 1 identifies masonry walls which are in proximity to, or could
'effect a safety related system should they fail. They are listed in order of priority.
Item 2.a: A description of the Maine Yankee masonry wall re-evaluation program is provided below for your information.
1.
Decarmine as-built condition of the walls identified in Item 1.
a.
Develop as-built sketches, including identity and location of any wall mounted equipment.
b.-
Provide detail location of safety related systems in proximity of the masonry block walls.
c.
Determine material properties and construction practices based upon historical records.
d.
Determine actual size and spacing of wall reinforcement using a magnetic "R" meter.
-2.
Determine applicable wall loads, a.
Using existing building Amplified Response Spectra (ARS) determine in plane and out-of plane inertia forces.
b.
Determine equivalent loads (or stresses) due to seismic building displacements (where applicable).
c.
Determine local loads due to wall mounted equipment.
NOTE:
(1) Only one pipe support has been identified as being anchored to a concrete block wall and that being for a 4" diameter pipe.
.(2) All the concrete block walls are located such that missile, pipe whip, pipe break, jet impingement, torncdo or pressurization loads are not applicable.
3.
Determine the degree of stress within the walls due to the loads identified above, using the working stress methodology.
4.
Allowable stresses will be based upon the 1979 Uniform Building Code (UBC), Chapter 24 and the most recently published American Concrete Institute (ACI) code.
If both UBC and ACI allowable are exceeded in the course of our re-evaluation effort, modifications required to bring the wall's stress within UBC allowables will be implemented consistent with Technical Specifications.
If, however, the stresses exceed UBC allowables, but are within ACI allowables, we will still install all required modifications on a more orderly schedule considering work and manpower.
If the wall stresses are within UBC allowables the wall will be considered acceptable as is.
9.
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Our ra-:valuntien effsrt hcs atracdy bagun end v2,plcn to hava all work, including any required modifications complete by November 8, 1980.
Item 3:
The ACI and the more conservative UBC codes have been industry standards for many years. These code allowables are conservative, have a solid basis in fact, are widely accepted and are substantiated by test data.
Since all but one of MY's concrete block walls are of single wythe construction and are only aubjected to dead, live and seismic load, cases clearly covered by both codes, we feel that no further justification for the use of these codes is required as the basis of our re-evaluation criteria. The one double wythe wall will be analyzed as two adjacent single wythe walls with no credit taken for the bond between wythes.
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l Room Reference l
Building Location Drawing Wall Location Equipment to be Protected t
Smrvice Switchgear 1150-FE-Battery No. 2&L area Reactor Trip Breaker SWGR, EMER HCC'(NCC-8A)
Room, EL 45'-6" 27B South and West wall DC Dist Cab 4, DC Dist Cab 3, DC Diet Cab 2, DCDistCab1,3/,22.5KVAinverter5,480V i
EmergencySWG, Bus 8,Ip10KVAInverter2, Battery Charger No. 2,!p10KVAInverter1, Battery Charger No. 1, B,attery Groups 1 and i Sarvice Cable Tray LL550-FA-Battery Room 3&4 area -
Battery Croups 3&4.
i Room, EL 35'-0" 1B South, North and West wall.
Cable Tray area, South Cable Trays DC, CS, C1, C4, DCBA, BA, C, C22 East wall between Cols C3, A1, A2, A3, C6, C5.
7 thru 8, only block wall.
Control Panel containing AFWS Controls, Main; Service Control Room 11550-FA-Toilet, South and East 1A wall By-Pass Feedwater Valve Controls, Containmen j
Recir. Fan Controls, Reactor Coolant Loop Indication, Reactor Coolant Pump Bearing Lif Lube Pressure Indication.
o Primary Waste Gas Surge 11550-FA-Removable Shield wall Gas Decay Drums, Waste Gas Surge Tank, Waste Auxiliary Drum Area 11A East wall Manifords i
EL 36'-0" Degasifier LL550-FA-South and East wall Containment Purge Line is attached to block (
Vent Condenser 11A around PAB non-nuclear Area salety class charcoal filter.
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TABLE L Room Reference Building g::ation Drawing Wall Location Equipment to be Protected e
Turbine
' Turbine Area 11550-FM-PCC Temperature Controller.
EL 35' 3C adjacent to elevator in hallway used for access to Control Room, clean locker.
Service Cable Tray Room ll550-FA-Cable Tray area South Control Room Breathing Air Supply Fans EL 35'-0" LB wall.
FN-7A, FN-7B and ventilation ducts located on' other side of South wall.
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