ML20031D363
| ML20031D363 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 09/29/1981 |
| From: | Crouse R TOLEDO EDISON CO. |
| To: | Keppler T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| 1-217, IEB-80-11, NUDOCS 8110130280 | |
| Download: ML20031D363 (8) | |
Text
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Docket No. 50-346 License No. NPF-3 voteoo Serial No. 1-217 EDISON September 29, 1981 ACHARD P. Caoust va pmet Mr. James C. Keppler e-9!
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!q Regional Director, Region III
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Office of Intpection & Enforcement h
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Glen Ellyn, Illinois 60137 I-OCT 9 1981=- r i
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Dear Mr. Keppler:
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3 IE Bulletin No. 80-11, dated May 8, 1980 (Log No. 1-362), requir 4
power reactors with an operating license (except Trojan, Sequoyah tyi N
North Anna Unit 2 and Salem Unit 2) to evaluate for structural adequacy all masonry walls which are in proximity to or have attachments from safety-related piping or equipment such that a wall failure could affect a safety-related system.
On July 14, 1980 and November 4, 1980 we submitted to you our responce to Items 1, 2a, 2b, and 3 of the Bulletin. Our May 15, 1981 letter (Serial No. 1-200) revised Toledo Edison's submittal date for this final report to September 1981. Attached is the final report for IE Bulletin No. 80-11.
In the performance of the evaluation required by IE Bulletin 80-11 we reviewed and/or reanalyzed 267 masonry walls. One hundred sixty nine of these walls were reanalyzed and 39 were found not to meet our acceptance criteria. These 39 walls were further analyzed and the failure of 3 of them were found not to affect safety-related systems or equipment. The
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remaining 36 walls even though not meeting our acceptance criteria still have adequate margin so as to not adversely affect operability of the unit. Our present schedule calls for the required modifications to these walls to be completed in January 1983.
Yours very truly, ff ds d/5 RPC:CLM Attachments cc:
NRC Office of Inspection & Enforcement Division of Reactor Operations Inspection Washington, DC 20555 NRC Davis-Besse No. 1 Resident Inspector
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$8 i THE TOLEDO EDISON COMPANY EDISON PLAZA 3CO MADISON AVENUE TOLEDO OHIO 43652 8110130280 810929 5 G@
PDR ADOCK 05000346 0CT G
Docket No. 50-346 License No. NFP-3 Serial No. 1-217 September 29, 1981 FINAL REPORT MASONRY JALL RE-EVALUATION RESPONSE TO NRC IE BULLETIN NO. 80-11 DAVIS-BESSE NUCLEAR POWER STATION UN?.T 1 In response to NRC IE Bulletin 80-11 a walkdown was performed at the Davis-Besse Nuclear Power Station, Unit 1 to identify all masonry walls and attachments of safety and non-ccfety related systems and equipment to the asonry walls. When the review of this walkdown information determined that there were no safety related systems or equipment attached to a wall or in the room (s) bounded by that wall, the eall was eliminated from further walkdown activity and analysis.
In our July 14, 1980, response to the bulletin (Serial Ncs 1-150), we indicated that 256 masonry walls had been identified and that 53 were being excluded from further analysis because no safety related systems or equipment were attached to or in the vicinity of the walls. This lef t 203 walls to be further evaluated.
In our November 4,1980, rssponse to the bulletin (Serial No. 1-169) we indicated that the number of walls to be analyzed had changed. This change was due to:
- 1) some larger walls being divided into smaller walls (subwalls) to facilitate Atto collection and analysis, and 2) ad-ditional walls were excluded as a result of f.r her walkdowns.
In this response we indicated that the total number of walls /subwalls was 267 with 99 excluded, leaving 168 to be analyzed. Since that response one additional wall that wig previously ex-cluded was found to support an adjacent wall with safety related attachments. This wall has been added to those requiring analysis and brings that total to 169.
The 169 walls /subwalls were analyzed and compared against the acceptance criteria established in our November 4,1980 response. The analysis showed that 130 walls /
aubwalls met and 39 walls /subwalls did not meet the acceptance criteria. Since some walls were divided into smaller subwalls to facilitate analysis, the 39 walls /subwalls that did not meet the acceptance criteria are actually only 32 walls. The results of our analysis presented in Table I are based on the wall /subwall numbers used for analysis. Where two or more subwalls make up a larger wall, this is indicated by a footnote. Twenty eight of the 39 walls /subwalls which did not meet the acceptance criteria will be modified. Of the remaining eleven walls /cubwalls, six which serve as fire barriers will be removed and replaced with alternate means of fireproofing; two will be removed and replaced with impingement barriers; three have been further examircl and the consequences of their failure found to be acceptable. The corrective action for each of the 39 walls /subwalls is sunmarized in Table I.
Eighteen of the twenty eight wall /subwall modifications are required to meet the accep-tance criteria during a postulated seismic event.
Nine of the wall /subwall modifications are required to meet the acceptance criteria during compartment pressurization from a main feedwater line break or crack.
The remaining modification requires adding a saismic joint to coincide with one in a supporting structure.
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2-All of the 39 walls /subwalls not meeting the acceptance criteria have been reviewed to determine if any may have an adverse affect on the operability of the Unit. This revit.w indicated that even though these walls /subwalls did not meet the acceptance criteria, there was adequate margin against failure such that the Unit could safely be operated until the modifications were made.
Presently, work packages have been issued for implementing modificatior.s to thirty walls /subwalls, and the work is in progress. The remainder of these work packages will be issued for implementation by November 1,1981. Based on our current schedule we anticipate having all of these modifications completed in January, 1983.
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Docket No. 50-346 License No. NPF-3 Serial No. 1-217 September 29, 1981 Page 1 of 5
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TABLE I -
SUMMARY
OF NON-ACCEPTABLE WALLS ANALYZED UNDER NRC BULLETIN NO. 80-11 Load Causi.4, Wall Area or item Summary of Corrective Wall /Subwall Non-Acceptance Causing Non-Acceptance Action 3 tin OBE Upper half of east edge is Joncrete pilaster will be not connected to any support.
added to provide support.
1068 SSE Bottom connection of wall Systems adjacent to this wall to floor, will not be af fected due to postulated wall failure.
2047 SSE Botton connection of wall Hangers 31-HCC-5-H5, to floor 31-HCC-5-Il6 and 31-HCC-5-H7 will be modified to remove attachment to wall.
I 2297 SSE Top connection of wall Floor beam will be braced.
(fioor beam) 2337 SSE Bottom connection of wall Angles and expansion bolts to floor will be used to reinforce connection.
3016(1)
OBE Top connection to floor Fixing wall 3026 will also above fix this wall.
3026(1)
OBE Adjacent support walls Top connection to floor above (3016 & 3036) do not pa ss is missing and will be added.
acceptance criteria 3036(1)
ORE Top connection to floor Fixing wall 3026 will also above fix this wall.
a 3167 Compa rtment pressure Masonry and top connection Steel bracing external to due to a break in the of wall (floor beam) wall will be added.
main feedwater line
Page 2 of 5 TABLE I (Cont.)
i Load Causing Wall Area or Item Summary of Corrective Wall /Subwall Non-Acceptance Causing Non-Acceptance Action 1
3177 Compa rtme nt pressure Ma son ry Steel bracing external to due to a break in the wall will be added.
1 main feedwater line 3187 Compartment pressure Masonry and top Steel bracing external to l
due to a break in the main connection of wall wall will be added.
feedwater line (floor beam) 3237 Compa rt ment pressure due Top connection of Floor beam will be braced to a crack in the main wall (floor beam) and edge connection will be feedwater line and north edge reinforced with angles and connection to expansion bolts.
1 adjacent concrete wall 3287 Compartmen* pressure South edge connection Cont.ection will be reinforced i
due to a crack in the to adjacent concrete wall with angles and expansion main feedwater line bolts.
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3307 OBE Top connection of wall Floor beam will be braced.
j (floor beam) f 3407 SSE Tnp connection of wall Floor beam will be braced.
1 (floor beam) 3447(2)
OBE or compartment Masonry Bracing external to wall pressure caused by a will be added.
crack in the main 4
feedwater line J457(2)
OBE or compartment Masonry Bracing external to wall j
pressure caused by will be added.
a crack in the main feedwater line J
3467(2)
OBE or compartment Masonry Bracing external to wall pressure caused by a will be added.
crack in the main feedwater line l
i
Page 3 of 5 TABLE I (Cont.)
Load Causing Wall Area or Item Summary of Corrective Wall /Subwall Non-Acceptance Causing Non-Acceptance Action f
4016 OBE Masonry, top connection Steel pilasters will to floor above and be added.
bottom connection to floor 4
4036 OBE dasonry, top connection Steel bracing external to to floor above, bottom wall will be added.
t connection to floor, and east edge connection to adjacent masonry wall 4107 Compa rtment pressure Masonry and all connections Steel bracing external to due to a crack in the to adjacent supports wall will be added.
main feedwater line i
4117 Compartment pressure Masonry and al1 connections Wall will be removed.
due to a crack in the to adjacent supports main feedwater line 4127 Compartment pressure Masonry and all connections Wall will be removed.
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due to a crack in the to adjacent supports i
main feedwater line 4647 OBE Seismic joint at south end Required seismic joint of wall is missing will be added.
4786(3)
OBE Masonry, top connection Steel bracing external to i
to floor above and bottom wall will be added.
connection to floor f
l 4796(4)
OBE Top connection to floor Steel bracing external to j
above wall will be added.
4806 OBE Seismic joint is missing Wall will be rencved.
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Page 4 of 5 TABLE I (Cont.)
Load Causing Wall Area or Item Summary of Corrective Wall /Subwall Non-Acceptance Causing Non-Acceptance Action 4817 OBE Adjacent support walls Wall will be removed.
(4806 & 4826) do not pa ss acceptance criteria and masonry does not pass acceptance criteria 4826 OBE Seismic joint is missing Wall will be removed.
4837 OBE Masonry Wall will be removed i
4847 OBE Masonry Wall will be removed.
4857 OBE Adjacent support wall (4847)
Wall will be removed.
does not pass acceptance c rite ria 4886(4)
OBE Top connection to floor Steel bracing external above, bottom connection to wall will be added.
to floor and side connection to adjacent concrete wall 4896(4)
OBE Top connection to floor Steel bracing external above to wall will be added.
4906(3)
OBE Top connection to floor Steel bracing external above to wall will be added.
5107 OBE Top connection of wall Floor baam will be (floor beam) braced.
5167 OBE Masonry Systems attached to wall have been examined for potential failure and failure is acceptable.
5207 SSE Top connection of Floor beam will be braced.
wall (floor beam)
Page 5 of 5 TABLE I (Cont.)
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Load Causing Wall Area or Item Summary of Corrective Wall /Subwall don-Acceptance Causing Non-Acceptance Action 5257 OBE Masonry Systems attached to wall
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have been examined for potential fai1~ure and failure is acceptable.
l Notes:
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(1) Walls 3016,1026 and 3036 have been analyzed as one wall unit.
(2) Walls 3447, 3457 and 3467 are one wall unit.
J (3) Walls 4786 and 4906 are one wall unit.
(4) Walls 4796, 4886 and 4896 are one wall unit.
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