ML20108F438

Forwards Sketches Indicating Method Utilized to Reinforce Walls & List of Reworked Walls,Per IE Bulletin 80-11 & Response to NRC 850116 Telcon Questions

ML20108F438
Person / Time
Site:	Fort Saint Vrain
Issue date:	03/01/1985
From:	Lee O PUBLIC SERVICE CO. OF COLORADO
To:	Johnson E NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
References
IEB-80-11, P-85069, TAC-42925, NUDOCS 8503120435
Download: ML20108F438 (23)

Text

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PUBLIC SERVICE COMPANY OF COLORADO P. O. SOX 84o OENVER. COLORADO 80200 OSCAR H. LEE March 1, 1985 Fort St. Vrain Unit No. 1 P-85069 Regional Administrator  % 9 e[q'y Region IV '- ] T U. S. Nuclear Regulatory Commission )ip- v 611 Ryan Plaza Drive MAR - 81985 Arlington, Texas 76011 Attn: Mr. E. H. Johnson

SUBJECT:

Masonry Block Walls

REFERENCES:

Meeting Between Mr. J.R. Reesy (PSC) and Mr. G.L. Plumlee (NRC) on November 27, 1984. Telecon between PSC and NRC on January 16, 1985

Dear Mr. Johnson:

During a meeting between Mr. G.L. Plumlee, SRI, Fort St. Vrain and Mr. J.R. Reesy of PSC, concerning our response to question 14 posed by Mr. Robert Clark's letter dated July 21, 1982 (G-82232),

Mr. Plumlee indicated it would be appropriate that PSC submit a series of sketches indicating how PSC reinforced each of the walls involved in rework as a result of IE Bulletin 80-11.

Attachment 1 to this letter is a list of the walls requiring rework under IEB-80-11, the detail of the reinforcement, to which side of the wall the reinforcement was installed and sketches indicating the configuration of the reinforcing.

PSC reconnends that your staff review the NRC Safety Evaluation for FSV compliance with IEB-80-11 as the original SER was prepared with the understanding that all walls were reinforced utilizing bar straps installed in a vertical configuration.

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I P-85069 Pagn 2 Attachment 2 to this letter is PSC's response to the NRC questions discussed during the telephone conference call between PSC and NRC on January 16, 1985.

PSC believes that since the request for the attached additional information is a direct result of conversations with the SRI and NRC, as referenced on Page 1 of this letter, an oath of affidavit is not required to accompany this letter.

Should you have any questions, please contact Mr. M. H. Holmes at (303) 571-8409.

Very truly yours, O. A $ ~ ly /$. y}%n/

0. R. Lee, Vice President Electric Production ORL/MM:pa Attachment

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Attachment 1 to.P-85069 Page 1 of 19 MASONRY BLOCK WALL REINFORCING SCHEDULE WALL # CONSTRUCTION DETAIL SIDE OF WALL APPLIED 2 DETAIL 2 BOTH SIDES 3 DETAIL 3A BOTH SIDES 3a DETAIL 3A BOTH SIDES 4 DETAIL 5 NORTH SIDE DETAIL 11 SOUTH SIDE 6 DETAIL 4A WEST SIDE DETAIL 13A EAST SIDE 7 DETAIL 4 WEST SIDE DETAIL 12 EAST SIDE 8 DETAIL 5A SOUTH SIDE DETAIL 13 NORTH SIDE 9 DETAIL SA EAST SIDE DETAIL 13 WEST SIDE 11 DETAIL 3A BOTH SIDES 12 DETAIL 3A BOTH SIDES 14 DETAIL 1 BOTH SIDES 16 DETAIL 1 BOTH SIDES 20 DETAIL 1 BOTH SIDES 27 DETAIL 3A BOTH SIDES 33* DETAIL 6 BOTH SIDES OF SOUTH END DETAIL 10 NORTH; SIDE OF WEST END DETAIL 6 . SOUTH' SIDE OF WEST END 49 DETAIL 7 SOUTH SIDE-DETAIL 9 NORTH SIDE 50 DETAIL 1A SOUTH SIDE (CLIP ANGLES AT TOP ONLY)

DETAIL 4A NORTH SIDE 57 DETAIL 7 EAST-SIDE DETAIL 9 WEST SIDE 58 DETAIL 7 EAST SIDE DETAIL 9 WEST SIDE 59 DETAIL 7 EAST SIDE DETAIL 8 WEST SIDE 61 DETAIL 10 WEST SIDE DETAIL 6 EAST SIDE 62 DETAIL 8 WEST SIDE DETAIL 7 EAST SIDE 64 DETAIL 8 NORTH SIDE DETAIL 7 SOUTH SIDE 65 DETAIL 10 WEST SIDE DETAIL 6 EAST SIDE 69 DETAIL 7 EAST SIDE DETAIL 9 WEST SIDE 70 DETAIL 7 EAST SIDE DETAIL 9 WEST SIDE

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'" to P-85069 Page 2 of 19 MASONRY BLOCK WALL. REINFORCING SCHEDULE

-WALL'# CONSTRUCTION DETAIL SIDE OF WALL APPLIED 71 DETAIL 7 EAST SIDE DETAIL-8 WEST SIDE 173 ~

DETAIL 8 NORTH SIDE DETAIL 7: . SOUTH SIDE' 85 ' DETAIL 10 SOUTH SIDE DETAIL 7 NORTH SIDE 86 DETAIL 10 SOUTH SIDE DETAIL 7 NORTH SIDE 89 DETAIL 10 SOUTH SIDE DETAIL 7 NORTH SIDE 95 DETAIL 3 BOTH SIDES-98 DETAIL 3A. EAST SIDE DETAIL 4 WEST SIDE 99 DETAIL 3A BOTH SIDES 100 DETAIL 7 NORTH SIDE DETAIL 10 SOUTH' SIDE 101 DETAIL 7 NORTH SIDE DETAIL 10- SOUTH SIDE 102 DETAIL 8 -

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Attachm:nt 2 to P-85069 Page 1 of 2 NRC QUESTION 1-Provide details of modifications which will be made to the tops of turbine room walls #4, #6, #7, #8, and #9 in order to qualify these boundries as pinned joints.

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PSC RESPONSE 1 Lateral restraints will be added to the tops of these walls as shown in Attachment 1, Pages 14 through 16. This work will be completed by August 2, 1985.

NRC QUESTION 2 Provide information on the number of unmortared-stacked block walls at FSV and their proximity to safety-related components.

PSC RESPONSE 2 PSC performed a field audit of all stacked block walls at FSV and identified a total of 13. It was determined that 6 of the 13 could potentially impact safety related components if failure were to occur during a seismic event. . The largest of these 6 walls, #97, is to be removed completely since it is no longer required for j shielding as orignially intended. The remaining .5 walls will be mortared in place, as _ required, to withstand the seismic forces.

This work will be completed by August 2,1985.

NRC QUESTION 3 Describe the acceptance criteria used in examining reactor building walls with cracked mortar joints between the masonry and concrete walls.

PSC RESPONSE 3 PSC believes that the full scale test performed. on wall #87 adequately demonstrates that the boundry between masonry and concrete is capable of resisting design seismic loads. At the time of testing, the boundries of wall #87 contained cracks similar to those currently found in other reactor building walls. However, to eliminate further discussion on this subject, PSC will extend all bar straps past the masonry-concrete boundry and anchor the straps to the concrete or install clip angles as shown in Attachment 1, Pages 3 through 16. All strap extensions, clip angles and anchors will be designed to resist seismic loads.

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Attachment 2 I to P-85069 Page 2 of 2 These modifications will affect walls number 3, 3a, 4, 6, 7, 8, 9, 11, 12, 27, 49, 62, 65, 85, 86, 89, 95, 98, 99, 100, 101, 104 and will be completed by August 2, 1985.

NRC QUESTION 4 Does a change notice deviation request exist which allows the deletion.of one bar strap on one side of a rectangular penetration through wall #12.

PSC RESPONSE 4 No deviation request exists which allows for the deletion of a bar

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strap on one side of the penetration through wall #12. A field audit was performed to examine all walls which have been reinforced to insure that all penetrations were properly framed out with bar straps. No other walls were found to have discrepancies.

Therefore, PSC considers the missing strap on wall #12 to be an isolated incidence. .The missing strap on the penetration in question will be installed as originally specified by August 2, 1985.

NRC QUESTION 5 Is bar strap design adequate to transfer shear load from masonry to bolts and prevent damage to masonry blocks from bolt bearing.

PSC RESPONSE 5 Calculations were performed te analyze the shear stress transferred from the masonry to the bolts and to analyze the compression stress in the masonry resulting fr?m ooit bearing. The results of these calculations demonstrate that actual masonry and steel stresses are within the allowables dictated by IEB-80-11 and that the strap design is adequate as installed. These calculations are available for review in our office.

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