ML20050B221
| ML20050B221 | |
| Person / Time | |
|---|---|
| Site: | Wolf Creek  |
| Issue date: | 03/25/1982 |
| From: | Koester G KANSAS GAS & ELECTRIC CO. |
| To: | Seidel W, Seidle W NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, KMLNRC-82-180, NUDOCS 8204050112 | |
| Download: ML20050B221 (5) | |
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KANSAS GAS AND ELECTRIC COMPANY Tef ELE cmc CtM*ANY
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- f Mr. W.C. Seidle, Chief Reactor Projects Branch 2 U.S. Nuclear Regulatory Commission
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8 Region IV l.i g 9g 611 Ryan Plaza Drive, Suite 1000 Arlington, Texas 76011 KMLNRC 82-180 Re:
NRC Docket No. STN 50-482 Ref: Letter KMLNRC 81-139 dated 11/24/81 from GLKoester, KG&E, to GLMadsen, NRC Subj: Final 10CFR50.55(e) Report - Concrete Block Walls
Dear Mr. Seidle :
On December 19, 1979, we reported to the Region IV Office that several concrete block walls erected at the Wolf Creek Generating Station had reinforcing steel which had not been properly posi-tiened.
In the referenced letter we stated that a report would be submitted on or before March 26, 1982.
Attached is the final report submitted pursuant to Regulation 10CFR50. 55 (e) regarding the concrete block walls.
If you have any questions, please contact us.
Yours very truly,
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GLK:bb Attach cc: Mr. Thomas Vandel Resident NRC Inspector P.O. Box 311 g
Burlington, Kansas 66839
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t B204050112 820325 PDR ADOCK 05000482 S
PDR 201 N Market - Woctuta. Kansas - Ma I Address: PO. Box 208 I Wichita, Kansas 67201 - Telephcno: Area Code (316) 261-6451
f 10CFR50.55(e) FINAL REPORT on CONCRETE BLOCK WALLS For WOLF CBEEK GENERATING STATION, UNIT NO. 1 KANSAS GAS AND ELECTRIC COMPANY March 25, 1982 W --i
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TAliLE OF CO!3 TENTS I
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Introduction 4
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Description of Deficiency l
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Analysin of Safet.y Implications I
IV.
Corrective Actions 4
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Page 1 of 2
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INTRODUCTION Prior to rnid December,1979, the control building interior walls on elevations 2032', 2016', 2000' and 1984' were erected by Daniel i
j International, the Constructor for the Wolf Creek Generating Station.
These walls were designed to be constructed with precast concrete i
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masonry units (CMU) with reinforcing steel grouted into the central cavity.
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construction personnel discovered that the reinforcing nteel was not properly positioned within the CMU's and documented the problem on Non-conformance Report IMU-1536-C and forwarded the report to the Architect Engineer (Dechtcl) for evaluation and disposition. All erected block i
walls designed to withstand the design basis seismic event were included j
un this report.
I On Decenber 19, 1979, Region IV of the U.S. Nucicar Regulatory Commicsion was notified of this construction deficiency.
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II.
DESCRIPTION OF DEFICIENCY l
Precast nasonry units used in the construction of certain internal I
walls within the control building contain reinforci. g steel. The design l
l for these units requires the reinforcing to be positioned outward toward i
the faceshell of the CMU.
The reinforcing steel in the nonconforming wa11. wan not posi tioned out wa rd.in reepsi red.
III.
ANALYSIS OF SAFETY IMPLICATIONS The nonconforming walls were located adjacent to safety-related equipment.
Because of this proximity to safety-related equipment, the walls were designated seismic cateqory I and were designed to withstand l
the safe shutdown earthquake. Failure to correctly position the L
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reinforcing within the wall reduced the ability of the walls to with-i i
otand seinmic forcen. The failure of thene walin could have damaged i
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adjacent nafety-related equipment nuch that safe shutdown capability l
would have been impaired.
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IV.
CORRI;CTIVI: ACTIO!J 1
i The mioplacement of the rebar within the Cf4U was due to mininterpreta-j tion of drawing details and incomplete inspections by field engincorn. To l
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preclude future problems, the Conntructor developed Work procedure WP-IV-II5,
" Construction of concrete tianonry Unit Walls", to clarify and formalize i
l consturction and inupection of Ct40'n to npocifically include checking for i
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correct rebar ponition.
j To preclude excennive delaya in llent.ing/ Ventilation / Air condi tioning 1
(IIVAC) anti electrical work, the Architect I:nqincer (A/I:) analyzed three wallt. tc determine whether or not they needed to be corpletely removed and 1'
rebuilt. The A/I: determined the main cant-west wall and its connecting duct chane located on column line C-5 at elevation 1984', the main cast-I went wall and itn connecting duct chase located adjacent to column line C-5 at elevation 2000', and the duct chase located on column line C-5 at I
elevation 2032' did not need to be replaced provided additional stif fenern i
were added.
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All walin ident.ified in t:CR Ititi-1536-C have been modified with required i
i additional nt i f fenern or have been removed and rebuilt in accordance with i
l the denign drawing, except the block work for the duct chane at elevationn 1901', 2000', 2016'. and 2032' at column line C-5.
This block work for the l
duct chase cannot be completed until the llVAC rework and tentinq has been
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completed.
IICH ItJti-1536-C will remain open until the block work in complete.
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