ML20045A187
| ML20045A187 | |
| Person / Time | |
|---|---|
| Site: | Brunswick  |
| Issue date: | 06/03/1993 |
| From: | Habermeyer H CAROLINA POWER & LIGHT CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| IEB-79-02, IEB-79-2, IEB-80-11, NLS-93-117, NUDOCS 9306090497 | |
| Download: ML20045A187 (6) | |
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Carolina Power & Light Company P O Box 1551
- Rale'Oh. N C. 27602 rJUN 031993 H. W. HABERMEYER, JR SERIAL: NLS-93-117 Vice Presdent Nuclear Semces Department United States Nuclear Regulatory Commission ATTENTION: Document Control Desk Washington, DC 20555 BRUNSWICK STEAM ELECTRIC PLANT, UNIT NOS 1 AND 2 DOCKET NOS. 50-325 & 50-324/ LICENSE NOS. DPR-71 & DPR-62 IE BULLETIN 80 MASONRY WALL DESIGN IE BULLETIN 79 PIPE SUPPORT BASE PLATE DESIGNS USING CONCRETE EXPANSION ANCHOR BOLTS i
Gentlemen:
The purpose of this letter is to update information previously provided to the NRC staff regarding Carolina Power & Light Company's (CP&L) response to NRC IE Bulletin 80-11, Masonry Wall Design, for the Brunswick Steam Electric Plant, Units 1 and 2. The updated information is the result of walkdowns and evaluations conducted during the outages that began on both Brunswick units in April,1992. The walkdowns and evaluations were part of an overall program for review of the IE Bulletin 80-11 program that was identified to the NRC staff in a CP&L submittal dated July 16,1992 (Enclosure 1, NRC Ouestion ll.A). The NRC staff evaluated the Brunswick Program in a q
Safety Evaluation dated October 8,1992 and determined the program to be " comprehensive and acceptable." In addition, a review of the IE Bulletin 80-11 program for the Brunswick Plant is documented in NRC Inspection Report 50-325/93-02 and 50-324/93-02, concluding that CP&L's IE Bulletin 80-11 review for the Brunswick Plant, and all masonry wall modifications required as a result of this review, are complete and acceptable for restart. Enclosure 1 to this letter provides a final summary of the results of the Brunswick Plant masonry wall review program.
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On May 8,1980, the NRC issued IE Bulletin 80-11. The Company's final response for the Brunswick Plant was submitted by letter dated December 21,1984. By letter dated January 30, 1985, the NRC issued a Technical Evaluation Report (TER) and Safety Evaluation (SE) finding 1) the Company's proposed modifications to be acceptable, and 2) that "there is reasonable assurance that the safety-related masonry walls at the Brunswick units will withstand the specified design load conditions without impairment of (a) wall integrity or (b) the performance of required safety functions."
The 1992 Brunswick Plant masonry wall review was based on the review criteria of IE Bulletin 80-11 as well as a review of functions beyond scope beyond the IE Bulletin 80-11 review criteria. During the 1992 review of the original Brunswick IE Bulletin 80-11 program, additional walls were identified that CP&L believed should be upgraded to safety-related classification. A total of 153 masonry Slock walls are now identified as safety-related at the Brunswick Plant, including five concute wall panels located in the Emergency Diesel Generator Building. The 1992 program review identified modifications to 63 masonry block walls which were necessary to ensure that the walls would meet their intended safety function (s). The masonry block wall modifications have been completed. Consistent with the findings in the original?
IE Bulletin 80-11 program review, no masonry block walls were found to be safety _related in either the Radwaste Building, the Augmented Off-Gas Building, or the Turbine Buildings.
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I Document Control Desk NLS 93-117 / Page 2 During walkdowns of the Emergency Diesel Generator Building, discrepancies were identified 1
between the CP&L responses to IE Bulletin 79-02 and IE Bulletin 80-11 and the current configuration of masonry block walls at the Brunswick Plant. The Company's IE Bulletin 80-11 response concluded that no safety-related piping was attached to or supported from masonry block walls. CP&L has subsequently identified two instances of safety-related piping attached to a platform that is supported by a masonry block wall. The involved one-and two-inch piping is part i
of the fuel oil drain and level switch system on the #2 and #3 emergency diesel generator four-day fuel oil storage tanks. The two walls have been re-evaluated to address the addition of pipe support reaction loads, using the acceptance criteria in IE Bulletin 80-11, and have been found to be acceptable without modification. The walls were identified in the original IE Bulletin 80-11 response as safety-related based on their proximity to safety-related piping and equipment.
NRC Inspection Report 50-325/88-36 and 50-324/88-36 closed IE Bulletin 79-02 for the Brunswick Plant and opened Inspector Followup item (IFI) 88-36-02. IFl 88-36-02 stated that CP&L would submit a Final Summary Report summarizing the IE Bulletin 79-02 requirements and CP&L's responses for the Brunswick Plant. The intent of item 5 in the CP&L March 22,1990 response to IFl 86-36-02 was to " Determine the extent that expansion anchor bolts were used in concrete block (masonry) walls to attach piping supports in Seismic Category 1/ Safety-Related System's."
The March 22,1990 CP&L response indicated that no expansion anchor bolts were used at the Brunswick Plant to attach safety-related piping to masonry block walls. CP&L has subsequently determined that the platforms in the Emergency Diesel Generator Building supporting the safety-related piping (as discussed in the previous paragraph) are attached to the masonry block walls with expansion anchors. Evaluations have shown that the expansion anchor bolts provide adequate anchorage for the attached platform and safety-related piping.
In Section 1.0 of the NRC SE dated October 8,1992, " Walls and Wall Anchorages," the NRC staff provided an evaluation of the seismic and structural deficiencies for Brunswick Units 1 and 2. The NRC staff concluded "that fullimplementation of the licensee's program should provide reasonable assurance that the walls are properly classified and the safety-related walls are configured according to design basis." Based on the completion of the masonry block wall walkdowns, evaluations, and functional wall review, the completion of the modifications required as a result of the reviews, and the information presented herein, CP&L considers the conclusions of the NRC SEs with respect to masonry block walls to be valid; that is,1) reasonable assurance has been provided that the safety-related masonry block walls at the Brunswick Plant will withstand the design load conditions without impairment of either wall integrity or the performance of the wall safety functions, and 2) the masonry block walls at the Brunswick Plant are properly classified and con'b.M roerd:n0 to drign basis.
Please refer any questions regarding this submittal to Mr. D. C. McCarthy at (919) 546-6901.
Yours very truly, LA c'
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irt H. W. Habermeye
Document Control Desk NLS-93-117 / Page 3 KAH/kah (nis93117.002)
Enclosure li. W. Habc,n. eyer, Jr., having been first duly sworn, did depose and say that the information contained herein is true and correct to the best of his information, knowledge and belief; and the sources of his information are officers, employees, contractors, and agents of Carolina Power &
Light Company.
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ENCLOSURE 1 BRUNSWICK STEAM ELECTRIC PLANT, UNITS 1 AND 2 NRC DOCKET NOS. 50-325 & 50-324 OPERATING LICENSE NOS. DPR-71 & DPR-62
SUMMARY
OF FINDINGS REGARDING MASONRY BLOCK WALL REVIEW ORIGINAL IE BULLETIN 80-11 REVIEW Summarv B5 Safety-Related Masonry Block Walls identified 20 Masonry Block Walls Required Modification Masonry Block Walls in Turbine Buildings, Radwaste Building, and AOG Building Not included in Scope of Original 80-1 I Review 1992 MASONRY BLOCK WALL REVIEW Summarv 153 Safety-Related Masonry Block Walls identified at Brunswick Plant (Both Units) 63 Masonry Block Walls Required Modification O Masonry Block Walls ir. Turbine Buildings, Radwaste Building, or AOG Building Required Modification or Upgrading to Safety-Related Status Unit 1 Reactor Buildino 61 Masonry Block Walls inspected / Reviewed (15 Safety-Related, 46 Non Safety G6:a;6d) 10 Masonry Block Walls Upgraded to Safety-Related (4 Due to Safety-Related Equipmern in Proximity,6 Due to interaction with Adjacent Safety-Related Walls) 1 3 Masonry Block Walls Required Modification (1 Required Modification to Meet Acceptance Criteria,2 Required Modification for Tornado Venting Concerns) 25 Total Safety-Related Masonry Block Walls E1-1
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-p Unit 2 Reactor Buiidino 65 Masonry Block Walls inspected / Reviewed (14 Safety-Related, 51 Non-Safety Related)
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12 Masonry Block Walls Upgraded to Safety-Related (4 Due to Safety-Related Equipment in Proximity,8 Due to Interaction with Adjacent Safety-Related Walls) 3 Masonry Block Walls Required Modification (1 Required Modification to Meet Acceptance Criteria,2 Required Modification for Tornado Venting Concerns)-
26 Total Safety-Related Masonry Block Walls Control Buildina 41 Masonry Block Walls inspected / Reviewed (26 Safety-Related,15 Non-Safety Helated) 15 Masonry Block Walls Upgraded to Safety-Related (5 Due to Safety-Related Equipment in Proximity,2 Due to Interaction with Adjacent Safety-Related Walls,6 Due to Being Required for Control Room Habitability Post-Earthquake,2 to Ensure Consistency as a Good Engineering Practice) 12 Masonry Block Walls Required Modification (12 Required Modification to Meet Acceptance Criteria,7 of the 12 Modified Walls Corrected Deficiencies to Walls Previously Classified as Safety-Related) l
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41 Total Safety-Related Masonry Block Walls Diesel Generator Buildina 61 Masonry Block Walls inspected / Reviewed (40 Safety-Related, 21 Non-Safety Related) 21 Masonry Block Walls Upgraded to bafety-Related (4 Due to Safety-Related Equipment in Praximity, 7 Due to interaction with Adjacent Safety-Related Walls, 10 Bacauca Failure Would increase Diesel Air intake Tem,)erame) 45' Masonry Block Walls Required Modification (19 Required Modification to Meet Acceptance Criteria,26 Modifications Corrected Deficiencies to Walls Previously Classified as Safety-Related) 61' Total Safety-Related Masonry Block Walls 1
Numbers Include 5 Concrete Wall Panels i
a Seven of These Walls Also Had Tornado Vents Installed to Reduce Different.ial Pressure on Wall or Adjacent Walls El-2
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Service Water intake Structure 2 Masonry Block Walls inspected / Reviewed (2 Non-Safety Related)
O Masonry Block Walls Upgraded to Safety-Related O Masonry Block Walls Required Modification O Total Safety-Related Masonry Block Walls Auamented Off-Gas (AOG) Buildino 16 Masonry Block Walls inspected / Reviewed (16 Non-Safety Related)
O Masonry Block Walls Upgraded to Safety-nelated O Masonry Block Walls Required Modification O Total Safety-Relatad Masonry Block Walls Radwaste Buildina O Masonry Block Walls Upgraded to Safety-Related O Masonry Block Walls Required Modification O Total Safety-Related Masonry Block Walls Unit 1 Turbine Buildino O Masonry Block Walls Upgraded to Safety-Related e
O Masonry Block Walls Required Modification O Total Safety-Related Masonry Block Walls Unit 2 Turbine BuildiDA O Masonry B!ock Walls Upgraded te Safety-Related O Masonry Block Walls Required Modification O Total Safety-Related Masonry Block Walls El-3
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