ML19347E001

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Updates 790705 Response to IE Bulletin 79-02, Pipe Support Base Plate Designs Using Concrete Expansion Anchor Bolts. Review of Insp Data W/Respect to Structural Integrity Revealed Only Three Potentially Deficient Anchors
ML19347E001
Person / Time
Site: Sequoyah  
Issue date: 04/03/1981
From: Mills L
TENNESSEE VALLEY AUTHORITY
To: James O'Reilly
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
IEB-79-02, IEB-79-2, NUDOCS 8104140599
Download: ML19347E001 (47)
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{{#Wiki_filter:77q TENNESSEE VALLEY AUTHCP'T" CH ATTAN0C'i A. TCN A TE 3IC U M: _. 400 Chestnut Street Tower II a THIS DOCUMENT CONTAINS ,g, POOR QUAUTY PAGES April 3, 1981 G R Q( O' Mr. James P. O'Reilly, Director Office of Inspection and Enforcement j o h g}pg 2 O I98l A.[ U.S. Nuclear Regulatory Consission Region II - Suite 3100 %=fpm 3 101 Marietta Street v k Atlanta, Georgia 30303 ..N j ? 00

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Dear Mr. O'Reilly:

SEQUOYAH NUCLEAR PLANT UNITS 1 AND 2 - NRC-IE BULLETIN 79 FINAL INSPECTION REPORTS TVA's initial response to IE Bulletin 79-02 (Concrete Expansion Anchor Bolts) for Sequoyah Nuclear Plant was submitted July 5, 1979, and a revised response was submitted on December 6, 1979 During the NRC-0IE review of TVA's response, Inspector L. Modenos visited the Sequoyah site and identified two additional questions. A response to these questions was submitted on January 22, 1981. An additional six questions were identified by H. Asher (NRC-NRR) and the TVA response to these que.stions was submitted on February 1, 1980. The four responses mentioned above constitute the complete response to IE Bulletin 79-02 except for the anchor inspection final reports which are enclosed. If you have any questions concerning this matter, please get in touch with D. L. Lambert at FTS 857-2581. Very truly yours, TENNESSEE VALLEY AUTHORITY .$. Mills, Manager Nuclear Regu ation and Sfaety Enclosure ' cc: Mr. Victor Stello, Director (Enclosure) Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, DC 20555 8104140 N

l l l ENCLOSURE i Sequoyah Nuclear Plant Concrete Expansion Anchor Bolts Final Inspection Report The Sequoyah unit 179-02 anchor inspection program was initiated Septem-ber 29, 1979, to determine if TVA's quality control program met the requirements of NRC-OIE bulletin 79-02. A random sample of 30 safety-related pipe support base plates was selected for each size expansion anchor. The inspection program was performed and the data recorded in the same manner as was done for the Browns Ferry Nuclear Plant 79-02 program. A copy of the inspection criteria is included in attachment 1. The anchor inspection resulted in the evaluation of 139 anchors with the following deficiencies with regard to inspection criteria: 1. Three anchors (2.16 percent) had an excessive variance in plus depth. 2. Fifteen anchors (10.79 percent) had bolts with thread engagement less than 1 nominal bolt diameter required by the General Construction Specification G-32. A review of the inspection data with respect to structural integrity revealed only 3 potentially deficient anchors. The 15 bolts with thread engagements less than one nominal bolt diameter did not reduce the bolt strength below the capacity of the anchors. 'Only 1 of the anchors that exceeded the structural acceptance criteria would not develop the required anchor capacity. The failure rate for the sample inspection program was.72 percent. This is less than a 1 percent failure rate and compares very closely to the G-32 failure rate of.69 percent with 56 failures in 8174 pull tests. Conclusions The failure rate reflected by the 79-02 inspection data and the G-32 pull tests are comparable. The G-32 inspection program is confirmed, and therefore is representative of the total anchor installation at Sequoyah unit 1. The NRC has previously reviewed the gencric response, the 79-02 inspection results, and the G-32 results and had determined that TVA had complied with the requirements of bulletin 79-02 for unit 1 (NRC Safety Evaluation Report for Sequoyah Nuclear Plant Units 1 and 2, Supplement 2, Section 3.9 2). I r

l i The Sequoyah unit 2 79-02 anchor inspection program was initiated September 8,1980, for the purpose of determining if TVA's anchorse . installations were represented by the G-32 quality control program. A random sample of 30 safety-related pipe support base plates was selected for ea6h size expansion anchor. The inspection criteria is identified in attachment 2. The anchor sampling inspection resulted in the evaluation of 217 anchors with the following deficiencies with regard to inspection criteria:' 1. Twenty anchors (9.22 percent) had an excessive plug depth variance. 2. Twenty-two anchors (10 95 percent) had bolts with short thread engagement. 3 Eighty-nine anchors had shells recessed deeper than 1/8-inch below the surface of the concrete. A review of the inspection data with respect to structural integrity reveals the following: 1. Two of the 20 anchors failed to pass the G-32 pull test. This constitutes less than 1 percent of the anchors inspected. 2. TWo of 22 with short engagement had less thread engagement than required to fully develop the anchors as determined by tests at Singleton Materials Engineering Laboratory. 3 With regard to deep shells, a TVA test program was performed to evaluate the effect of shear on the anchor with deep shells. The data indicated that recessed shells as much as 1/2-inch did not affect the capacity of the agchor. Results The.92 percent of anchora that were determined to be structually unacceptble compares favorably to the G-32 pull test data failure rate of.69 percent at Sequoyah Nuclear Plant with 56 failures out of 8174 pull tests. The inspection with respect to plug depth verifies the representativeness of the pull test program and no additional informa-tion is likely to be obtained by continued inspection for plug depth. The anchor installation with respect to both G-32 pull test data and 79-02 inspection data verified the anchor installations at Sequoyah unit 2 were structurally acceptable. There were only 2 bolts with thread engagements less than the one nominal bolt diameter required in G-32; however, the bolts had enough thread engagement to fully develop the anchor. 010330 38 1

i Conclusions .The results of the sample inspection are representative of the total anchor installation at Sequoyah unit 2. Since the 79-02 inspection is comparable with the TVA G-32 anchor installation and verification program, the G-32 program is represent-ative of the Sequoyah unit 2 anchor installation. Therefore, the i requirements of NRC IE bulletin 79-02 have been complied with for i Sequoyah units 1 and 2. i 1 i I B O 010330 38

',ATTAQiMENT 1 SEQUQYAH NUQ. EAR EANT UNIT 1 79-02 ANQl0R INSPECTION PROCEDURE, EVALUATION CRITERIA AND WRK EAN s e i e I l k S e 010330.38 t e n

.o sEquoW.H NUCLEAR PLANT AMCHOR INSPECTI(at PROGRAM name x 1. Identify in safety-related systems a minimum of 50 base plates that are readily accessible, nese plates are to be on ceilings, valls, and floors. 2. A =fnimum of l'20 anchors' are to be inspected as follows: ~ 1/2a 6 = 30 5/8a ( = 30 3/4" 6 - 30 7/8" d = 30 l ' 3. De inspection program is to be performed and' data is t'o be r'ecorded

  • in the same mantier as is being done at Browns Perry Nuclear Plant. -

(see ) 4. Anch' ors outside of the acceptance criteria are to be pull-tested to G-32 proof loads.

5. 'SWP engineer at site vill review data sheets and recheck any questionable anchors.

,{ 6. Data sheets are to be sent to EN DES CEB for evaluation. h.!- 7. A susary of' data vil'I be maintained at sequoyah as well as copies of all data sheets. ) i ) e e 9 e I @A S 9 W

(; fiEQUOYAH NUCIIAR PLAIC j (b l 4 ANCHOR INSPECTION PROGRAM v ;' I e ( 1 l '[ Phase II ~ t If more than 4 anchors are found to be outside the anchor acceptan'ce criteria of the Phase I inspection program, Phase II is to be initiated. 1. In a minietta of 100 anchorages (different from the Phase I anchorages) 240 anchors are to be inspected as follows: gn 60

  • =

gn 60 2. Phase II is to be carried out in accordance with st,eps 3-7 of Phase I. Xf more than 12 anchors total from Phase I and Phase II are found to be outside of the anchor acceptance criteria, the inspection effort is to .be reevaluated / t. c.s.. .= g E}.- t .. 3;p g i 9 g 9 g W e y,*,

l o g SE@ m AH M W R P M t ANCHOR INSPECTION PROGRAM Proof Test Of Anchors That Are Outside Inspection criteria, 1. Verify that a minimam gap of 1/8" exists betwein plate and top of anchor shell. If no gap exists between the plate and top of shell Prior to testing the entire plate natst be raised if testing is to be done thru the plate. Otherwise, the plat,e must be removed to test. 2. Apply load to the anchor by inserting a threaded rod thru the plate and into the shell. 3 Load to proof loads in construction 5pecifications G-32. ~ l V. Inspect tAinsure that'the shell has not contacted the plate.

5. Record data.
6. SNP engineer at site vill review data sheets.

7 Data sheets are to be sent to EN-DES CEB for evaluation..

8.. conf data is to be maintainea at site.

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j (.S;4 . ANCHORAGE EVALUATION CRITERIA 8 (1) Plug Depth Criteria '(2) Edge distance criteria (3) Thread Engagement Criteria ,, ~ ', ' ' (4) Anchor Capacity Criteria ~ .t ,,,.,.,. c, t* L., ..z :. PLUG DEP3E CRITERIA i ~.. Plug Depth (Inches) Anchor Size Normal Minimum Maximum- ~ 13A' 2-1/2 7/8 Inches '2-9/32 3A Inches .1-15/16 1-1/2 2-1/8 5/8 Inches 1-5/16 ,1 111/2 '1/2 Inches ', 1-5/32 7/8 1-3/8 3/8 Inches 25/32 1-9/32 - 15/16 b.g[. r-CRITERIA FOR EDGE DISTANCE FOR PUNCHES, REA!ED, OR DBTT. TID HOLES Table 1.16.5 AISC Seventh Ed,ition is to be used as the minimum criteria, for edge distance for punched, reamed, or drilled holes. (Inches) Bolt Diameter At Sheared Edge At Rolled Edge or Gas Cut 1/2 7/8 3/4 5/8' 1-1/5 7/8' ~ '1-1/4 ~ 1 3A 7/8 l'-1/2 1-1/8 n l

l Gn i W ' DUG lAD ENGAGD2NT CRITERIA G-32 requires one bolt diameter thread engagements. For engagemen.ts less than one bolt diameter refer to the following summary:- THREAD ENGAGEMENT TO DEVEIDP SEIF-DRILL ANCHORS Bolt . Ult . Ult Bolt Engagement to Develop Dia. G-32 A307 Use . Ultimate of Anchor 1/2 . 7.8K _8.52K 91% 0.'375 diameters' 5/8 10 5 - 13.56 77% 0.22 diadeters 3/4 14.9' 20 94 'A$ o.25 diameters 7/8 .17 8-27 72 64$ 0.25 diameters

  • Based.'oru. tests at.' Singleton Lab. memorandum " Browns Ferry Nuclear Plant -

gn qgg Correlations of Thread Engagement of A307 Bolts in self-Drilling Anchors to Tensih Capacity-OIE Bunctin 79-02," dated August 17', 1979 (CSB790820001). .gm. GY

x.., s . um. t ANCHOR CAPACITY CRITERIA For capacities of self-dining anchors refer to the fonowing charts. m .r.,.,.. ..s...,- .s. -s .e ..,..... g.:.. s: . ~..- s. 1 . ~. ~ .y,m., g .s.. . =.. =..

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.m ~ g:s! ':ifir Gr. e 3,/g".'- 7 ' M? a. J I " SELFDRILi.ANCH6RS' 100-1- s s. .C 8 0.-- .A-P A- .C I 68 -- y Y-40 =- t i I 20 - \\. l 2 f I 3 l ~ 0.0 0.2. - 0.4 0.6 O.8. 1.0 FLUG DEPTH CINCHES) ~, ACCEPTANCE CHART

~ t ' Fo g = 7. g A, ' g"SELFDRILLANCHORS 2. 100-I \\ y m C 80-A p .~ A . I,, I* 60-T u-l j 4 g.- I I t I I 3 4 4 4 ( I' I 3 I I I I I I I II 1 ~1.50 0.00 - 0.25 0.58 . 0.75 1.00 - .1.25. l ~ PLUG DEPTH (IHCHES). ~. ,p' ..cik .. p acCEFinNCE CHART

ti$ .' 4 E." SELFDRILL ANCHORS. ,7 Fag : Io.t". - 3 -3 100-C 80-A p A C I 60 - T. Y. 40 - 1 28 - e. i i - 7 i iia i-. a. i - : e i 0i 0.5 1.0 . 1,5 .2.0 i 8.0 PLUG DEPTH (INCHES.) ~ ~ ' ACCEPTANCE CHART t-

84" SELFDRILL ANCHORS ' .? For+ 314,9 4 8 .4. ~ 100-9 e ~ C 80 = k-p A ~ .C I 60 - T Y' 40- .s gg - e u u ru n n u v s s n s a s 0~ 1 s 1 i ls 2.0 - '.21 0.0 0.5

1. 0.

1.5 PLUG DEPTH < INCHES). ,m' c. ~ ~.. ACCEPTARUE CHART

c pN .~ ~.~. ~ ~~ G "... me. ~ w e . ? Fyif l7. 84 l h4SELF'DRILLANCHORS 5-100-g g C 8 0 -- h-p A .c I 60 T. Y i. 40- } l 20= s iiie ii i iie i,

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1. 5 2.8 2.5 3.0 0.0 0.5 PLUG DEPTH < INCHES >

~ . ACCEPTAN,CE CHART

~ > TENNESSEE VALLEY AUTHORITY W*:- 5EQUOYAH tlVCLEAR PLAtlT i l ATTACHMENT A l TO WORK PLATil0. 4996 PROGRAM FOR VERIFY 1tlG CORRECT INSTALLATION OF SELF-DRILLING TYPE CONCRETE AMCHORS IN UNIT 1 SAFETY RELATED PIPING / DUCT SUPPORTS I FOR RESPONSE TO NRC IE BULLETIN 79-02, en. E s l I I fc/B ~ oc 1 oate 28 SEPT 79 ~ p i O I

U$[kPliillo.4996 ,Page 1 of 5 .~ PROGRAM FOR VERIFYING' CORRECT INSTALLATION f.:$ 0F SELF-DRILLING TYPE CONCRETE ANCHORS IN UNIT 1 SAFETY RELATED PIPING / DUCT SUPPORTS FOR RESPONSE TO NRC IE BULLETIN 79-02 i 1.0 SCOPE- ~ The purpose of this procedure'.is to verify correct installation of self- . drilling type concrete anchors on safety related piping / duct supports. .,J 2.0 REFERENCE TVA Construction Specification No. G-32. " Bolt Anchors Set In Hardened hunk" t 3.0 PREREQUISITES AND TOOLS' { 3.1 Tools for removing 1/2" thru 7/8" diameter bolts will b5 needed. 3.2 Scale or rule with 'at least 1/16" increments for taking measurements. fn. 3.3 Center.-hole hydraulic jack with gauge. se-3.4. Test probes for gap check. > P.% -). {J 9 4.0 PRECAUTIONS Only one bolt at a t'ime may be removed from each baseplate assembly. 5.0 INSTRUCTIONS l 5.1 Sketch each base plate on data shee't 1 and identify each bolt anchor i with an individual anchor number. Also measure the bolt anchor spacing and include on sketch. 1 2 A-o BOLT SPACING 8-O G % ANCHOR B 2 I'.IE 5.'2 Measure the attachment' plate thickness and record under the "T" column on Data Sheet 1. l

' Attachment A l Work Plan ib. 4996 Page 2 of 5

gh S.3 Using a probe of thickness specified in gap table below, check each bolt location for the gap between the attach
ent plate and concrete surface as shown in sketch.

If the probe can touch the shell or bolt for at least 90 degrees around the opening, measure the gap and record under gap column on Data Sheet 1. If there are areas where the gap is less than the specified probe thickness, record "0" under gap column on Data Sheet 1. 6 7 o rzzrb zz" &~ ~ $*$ ScfARC 4 \\, W CORNER [$wneN A!CHOR' SIZE MAX. GAP 1/8 7/8 3/4 '. 1/8 6/8 1/8 ~1/ 2. 1/32 'In cases where the plate gap is decreased below these values after reinsta11ation of bolt, indicate this in the " Remarks" column on ..g Data Sheet 1. m.- 5.4 Remove one ' bolt from the attachment plate A. Neasur's the distance fran the top of the anchor shell to the top of the' attachment plate and record under column "L2" on Data Sheet 1. B. Chack to Yee if the.threa'dN end of tne shell has been cut off below the @rmal break off line. P. 1.- If breakoff if normal, record "N" under column "L3" on Data Shee't 1. 2. If nohnal breakoff cannot be determined,' measure the us'able thread length and record under column "L3" on Data Sheet 1. C. Measure the distance fran the top of the shell to the expansion plug and record under column *L1" on Data Sheet 1. 1. If the distance fran the top of the shell to the expansion plug is less than the minimum plug depth as specified on Data Sheet 1, annotate under the " Remarks" column on Data Sheet 1. Reinstall tolt and i.ighten to 1/8 to 1/4 turn after contact between bolt, washer, and plate. Continue ...(;M on to next anchor bolt assembly to be checked in the attach- ~ ment. pla te. Start with step 5.3. e

Attachment A % lark Plan ib. 4996 I ,.Page 3 of 5 2. If the distance from the top of the shell to the expansion a6g plug is greater than the maximum plug depth as specified on 3ata Sheet 1, proof-load the anchor as follows: .(a) Verify that a minimum gap of 1/8" exists between the plate and the top of the anchor shell. If no gap exists, the entire plate nust be raised if testing is to be done through the plate. Otherwise, the plate must.be removed to test. (b) A ply load to anchor by inserting a threaded rod thiough e pl$te and. into the shell. (c) Load to proof-loads per General Construction Specification No. G-32. (d) Verify that shell has not contacted the attachment plate. -(e) Record' data under " Remarks" column on Data Sheet 1. D. Measure the bolt hole size and record under column "D" on Dr.ta Sheet 1. In cases where an out-of-round or oblong hole is encountered, measure the maximum dimension of the bolt hole and indicate the geometry of the hole on sketch on Data Sheet 1. E. Measure the distance fran the edge of the bolt hole to the nearest gn plate edge and record under column "ED" on Data Sheet 1. .F F. Check bolt thread engagement and record under column "TER" on Data . Sheet 1, 1. If one bolt diameter of thread engagement can be obtained,' verify that "TER" is less than "L1". If true, tighten bolt to 1/Wto 1/4 turn after contact of bolt, washer, and plate. record "N/A"' under column "TEI" on Data Sheet 1 then proceed to step 5.G. If "TER" is greater than or equal to "L1", the bolt must be replaced with one of a suitable length such that one bolt diameter of thread engagement can be obtained and "TER" is less than "L1". Record replacement bolt thread engagement under column "TEI" on Data Sheet 1. Tighten bolt to 1/8 to 1/4 turn after contact of bolt, washer, and plate. Proceed to step 5.G. 2. If one bolt diameter of thread engagement cannot be obtained, the bolt must be replaced with one of a suitable length such that one bolt diameter of thread engagement can be acconplished. Check the bolt thread engagement and record under column "TEI" on Data Sheet 1. Verify "TEI" is less'than "L1" then tighten (f.% bolt to 1/8 to 1/4 turn af ter contact of bolt, washer, and plate. .a e ---u-e ,n-- - - ,,--n,--

~ Attachcent A 1 Work Plan flo. 4996 Page 4 of 5 ath J(i.9 6. Repeat steps 5.3 thru 5.4.F. for any additional fasteners to be checked on the plate under test. 6.0 00CLMEttikTION ~ Submit dats sheet to EN DES for review. i 6 . Attachments } b. i n e i 9 l S I- . cyr i

syS7en

~h fll"lp ATTACIMNTA ACMPLAM4996 Q uygggy

.hAGE 5 ors hl HA%GRLD g ofMRS G D16 D',TE Rb?fMND PT.TFQRMED BY "W MZAN1"BKpR. RVGDEPTH (ZNCHES) ncuore 'SzE /MRMAL MIN. MAL l ?/8" 2 - 9 /32. 1-3/4 2-1/2 3/4' 1-15/16 1-1/2. 2-1/8 5/8" 1-5/16 1 1-f /t 1/2" 1-5132 1/S 1-3/6 SKETCH .t3 Tea 7sz so c4p asmanws

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i i ,ATTACbENT2 SEQUOYAH NU(LEAR PLANT UNIT 2 79-02 ANCHOR INSPECTION PROCEDURE, EVALUATION CRITERIA AND WORK PLAN b i I l e

Sequoych Nuclear Plant Unit 2 ~ ~ ? *, ~ i 1.0 . PURPOSE g?S The purpose of this app,endix is to verify the correct installa-en. tion of self-drilling concrete anchors in safety related systems per General Construction Specification G-32 and TVA's inspection and testing program. 2.0 SCOPE This appendix is applicable to safety related systems on a per unit basis.

3.0 REFERENCES

3.1 Civil Design Standard DS-C6.1, " Concrete Anchorages." General Construction Specification C-32 for " Bolt Anchors Set in 3.2 Hardened Concrete." 3.3 General Construction Specification G-53 for " Certification. Identification, and Storage Requirements of Bolting Materials for Nuclear Power Plants." 3.4 U.S. Nuclear Regulatory Commission IE Bulletin No. 79-02 (Revision 1), June 21,1979, Pipe Support Base Plate Designs Usina Concreta Expansion Anchor Bolts. hi 4.0 DEFINITIONS 4.1 Attachment-A piece of equipnent or fixture to be fastened to hardened concrete. Anchor-A threaded device for fastening attachments to hardened 4.2 concrete of the following types: 4.2.1 Expansion Anchor-An anchor which expands laterally in a drilled hole to resist pullout. 1 4.2.2 Self-Drilling Expansion Shell Anchor--An expansion shell anchor which uses the shell for drilling the hole (designated herein and on drawings as SSD). 4.3 Slip During testing, an anchor shall be considered to have exhibited slip if the load indicator decreases or remains constant while increasing strain is being applied or if the load indicator decreases while a constant strain is being applied. G 4 m-m..

a..~ s.>- y w a ssusauus. .g ,' 1 Sequoyr.h Nuclect Plc:t Unit 2 's 4.4 The normal breakoff tends to be-a jagged tear that moves up or j "Nf) 'down about 1/16 inch so the top of the shell may be difficult i to observe within 1/16 inch. If the top has been cut or ground, j it'will be smooth. r 5 *.0 RESPONSIBILITIES 5.1 The Construction Engineer will be responsible for assigning personnel to carry out this instruction. 6.0 INSTRUCTIONS ) 6.1, General Plan, Outline 6.1.1 Initiate phase I, following the inspection and documentation i procedure outlined in paragraph 6.4. 6.1.1.'1 For*any anchor outside the accpetance criteria, follow the / pro'cedure of paragraph 6.5. for proof-testing and inspect all. other anchors on the plate. + 6.1.2 Following completion of phasa I, review data and initiate' phase II if necessary. 6.1.3 Submit all data to Di DES CEB for review and evaluation. g w? 6.2 Phase I e. 6.2.1 Identify from safety related systems a minimum of 180* base plates that are readily accessible. These plates are to be on ceilings, { walls, and floors. l 6.2.2 A minimum of one bolt per, plate is to be inspected as follows: j'

  • 1/4" $ = 30
  • 3/8" 6 = 30 j

1/2" 6 - 30 ] 5/8" 6 = 30 3/4" $ = 30 4/8" p = 30 t I

  • Provided 1/4" 9 and 3/8" 6 are used in sufficient numbers for safety related systems to select 30 base plates for each size.

Otherwise, the number tested will be the number available. 6.2.3 Ihe inspection program is to be performed, and data is to be recorded as described in paragraph 6.4. 6.2.4 Anchors outside the acceptance criteria are to be pull-tested as described in paragraph 6.5. Y? ,I 4

3,,.-;,. f Anchor Sampling Pr:c'aduro a* Sequoyah Nuclear Plant Unit 2 6.2.5 Ihe EN DES engineer at site will review data sheets and recheck any, questior.able anchors. 6.2.6 Data sheets are to be sent to EN DES CEB for evaluation. i 6.2. 'A Copies of all data sheets will be mafr.tair. d at Sequoyah Nuclear Plant. y I ~ 6.3 Phase II

i 1

If more than 4 percent of the anchors are found to be outside the anchor acceptance criteria of the phase I inspection program, phase II is to be initiated. 6.3.1 In a minimum of 180* plates (different from the phase I plates), 2 anchors per plate are to be inspected as follows:

  • 1/4" $ = 60
  • 3/8".9 - 60 1/2" 9 - 60 J

S/a" 9 - 60 3/4" 9 = M g 7/8" 6 = 60 t r;ia

  • Provided 1/4" 9 and 3/8" $ are used in sufficient numbers for.

Fi# safety related systems to select 60 base plates for each size. Otherwise, the number tested will be the number available. 6.3.2 Phase II is to be carried out in accordance with paragraph 6.4 through 6.6 as in phase I. Af ter' completion of phase II,the , ins,pection' data is to be reevaluated by EN DES CEB.

  • W, J

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.,.e...,-... ,s.u.v. Sequ:yrh Nuclear Plant Unit 2 l '. 6.'4 Inspeetion and Documentation ~ (f:,),)/ Sketch each base plate on Data sheet I and identify each bolt.Also mea ) 6.4.1 anchor with an individual anchor number. } anchor spacing and include on sketch. f* j ~ l y BOLT SPACING i O .j [. ,A O y \\ a a i, . k L. Axenon n2 .3.l.- o 6 a o .m ,a Measure the attachment plate thickness and record under the 6_.4.2 "T" column on Data Sheet 1.' ' Using a probe of thickness specified in gap table below, ' check each bolt location for the gap between the attachment . 6.4.2.1 If the plate 'and concrete surface as shown in sketch.p ' yj) around the opening, measure the gap and record under gap f.: If there are areas where the gap .c,olumn on Data Sheet 1. .1, less than the specified probe thickness, record "0" ,under gap column on Data Sheet 1. r, j 19 1 p s piir,)r ~ seAnc (+y ? N#

END V*

> CORNER h coNo/noN N. s HAX. GAP - ANCHOR SIZE 1/8 7/8 1/8 3/4 1/8 5/8 1/32 1/2 1/32 l-3/8 In cases where,the plate gap is decreased below these values after reinsts11ation of bolt

  • indicate this in the " Remark

'(EEn column on Data Sheet 1.. f \\;nr i e I h

4 \\ ( T t

l 3...I. ?

Anchor Sampling Proc dura

....... a.

4 l ', D, ' Sequoyah Nuclear Plant Unit 2 ] i 1 ( 1 Remove one bolt from the attachment plant.. Measure the bolt + 6.4.3 l..g, diameter and record under column " SIZE". 7 3 Hessure the distance from the top of the anchor shell to the 6.4.3.1 top of the attachment plate and record under column "L2" on ! Q Data Sheet 1. 8 2 6.4.3'.2 Check to see if the threaded end of the shell h'as. been cut J off below the,Aormal breakoff line. dI If breakoff is normal', record "N" under column "L3" on Data i

,6.4.3.2.1 Sheet 1.

. If normal breakoff cannot be determined, measure the usable j 6.4.3.2.2 thread, length and record under column "L3" on Data Sheet 1. ~ i j Heasure the distance from the top of the shell to the expan-6.4.3.3-J sion plug and record under column "L1" on Data Sheet 1.- If the distance from the top of the shell to the expansion 6.4.3.3.1 f d on Data ' plug is less than the minimum plug depth as speci ieSh Reinstall bolt and tighten to 1/8 to 1/4 turn after contact between bolt, washer, and plate. Continue on to next anchor St. art with assembly to be checked in the attachment plate. step 6.4.3. ff the distance from the top of t,he shell to the expansion m.- 6.4.3.3.2 plug is greater than the maximum plug depth as specified on ap Sheet 1, proofload the anchor as outlined in paragraph .S Measure the bolt hole size and record 'under column "D" on 6.4.3.4 . Data Shee t I. In cases where an out-of-round or oblong . hole is encountered, measure the maximum dimension of the . # bolt hole and indicate the geometry of the hole on sketch .' on Data Sheet 1. 'Hemsure the distance from the edge of the bolt hole to the nearest plate edge and record under column "AD" on Data'

6.4.3.5 Sheet 1.

Check bolt thread engagement and record under column "TER" 6.4.3.6 t on Data Sheet 1. If one bolt diameter of thread engagement can be obtained, 6.4.'3.6.1 If true, tighten verify that "TER" is less than "LI." bolt to 1/8 to 1/4 turn after contact of bolt, washer, and plate; record "NA" under column "TEI" on Data Sheet 1, then proceed to step 6.4.3.7. i i i

Anch:r Sampling Proc durs (,. - Sequoyah Nuclear Plant Unit 2 ~ 1 ~ 'y.?f-If "TER" is greater than or. equal to "L1," the bolt must be replaced with one of'.a suitable length so that one bolt

I diameter of thread engagement. can be obtained and "TER" is less the "L1."

Record replacement bolt thread engagement under column "TEI" on Data Sheet 1. Tighten bolt to 1/8 to 1/4 turn af ter contact of bolt, washer, and plate. Proceed to step 6.4.3.7. 6.4.3.6.2 If one bolt diameter of thread engagement cannot be obtained, j the bolt must be replaced with one of a suitable length so that one bolt diameter of thread engagement can be accom-plished. Check the bolt thread engagement and record under column "TEI" on Data Sheet 1. Verify "TEI" is less than "L1," then tighted b'olt to 1/8 to 1/4 turn after contact j of, bo).t, washer, and plate. l 6.4.3.7' Repeat steps,6.4.3 through 6.4.3.6.2 for any additional fasteners to be checked on the plate under test.' 1,. - 1: 6.4.3.7.1 If on'a bolt on a plate fails the inspection criteria, the remaining bolts 6n the plate are to be inspected. These addi'- tional bolts are not to count toward the minimu:n number of 1 anchors as specified in Phase I and/or Phase II. 4 6.5 Proof-test of' Anchors that are Outside Inspection Criteria f@? 6.5.1 yerify that a minimum gap of.1/8 inch exists between plate and top of anchor shell. If no gap exists between the plate I .and top of shell prior to testing, the ent. ire plate must. be paised if' testing is to be done through the plate. Other-wise the plate must be removed to test. j 6.5.2 Apply lead to t.he anchor by inserting a threaded rod through the plate a7d into the shell. 1 6.5.3 Load,to proofloads in table 1 below. = ( i .r.. 6.5.4 Tnspect to ensure that the shell has not contacted the plate. 6.5.5 If failures occur, replace and retest as required in accord-ance with General Construction Specification G-32. 6.5.6 In addition, inspect all other anchors on the plate in j accordance with paragraph 6.4. 6.5.7 ' Record all data. i 6.5.8 The EN DESengineer at the site will review all ('ata sheets. 6.5.9 Data sheets are also to be sent to EN DES CEB for evaluation., m.f, y i t d l

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  • Sequoyr:h Nuclear Plant Unit 2

) : ..I~ 6.5. I'0 i copy of all data is to be maintained at the site. ~ 1

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vn TABLE 1 1, Bolt size (in) 1/4 3/8 1/2 5/8 3/4 7/8 Proofload (1bs). 900 2200 4000 5400 7600 8300 j t i. 7.0 Attachmenta 1 7.1 Attachment A--Data, Sheet 1 1 J g l. g 1 e e i l l 4 l 1 {,r5 .t 8 9 + s 1 t x 1 1 f f. j 1 I l t I 1 4 I..... .a. "N ' j N l 9 .t 1 s +

g..,, ...y. --- - g4m y .--.~... ATTACHHENT A : l' 4, ' ' ^ BATA, SHEET 1 EL SYSTEM ~ ~ llANGER ID COL LINES AZ REFERENCE DWG RADIUS DATE TESTED - Note 1 - Acceptance crite: C' PERFORMED BY has not been devi 4 for 3/8" and 1/4' COGNIZANT ENGR anchors. Data v: - recorded for the DATA ACCEPTED EN DES DIGR DATE-and reviewed by I for acceptabilit) ANCH R DEPTH TO PLUG (INCllES) N SIZE NORMAL HIN HAX .i 7/8 2-9/32 1-3/4 2-1/2 3/4 1-15/16 1-1/2 2-1/8 ~~' 5/8 1-5/16 1 1-1/2 1/2 ~1-5/32 7/8 1-3/8 !WCHOR SIZE 11 L2 T. D. L3 TER TEI ED GAP REMARKS 3/8 and 1/4--See note 1. \\ No. c .t ,u rag ~~r M..ntv-l 2 W o* ? ~ A X \\\\ N W W L'WNW W J c Sy, ,&,f l k > o j,e / l 4o

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i Mittsoratsc titr> Tswassssa vittsr Aurnonirr 90. G. G. Stack, Project Manager, Sequoyah Nuclear Plant CONST R. W. Cantrell, Sequoyah and Watts Bar Design Projects Manager, 204 GB-K i FROM

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  • DATE t

i SU,BJECT: SEQUOYAH NUCLEAR PLANT UNIT 2 - NRC-01E BULLETIN 79 ANCHOR i SAMPLING EVALUATING CRITERIA t This memorandum serves as a cover for transmitting 79-02 anchor sampling inspection acceptance criteria. It is intended to be used to evalusta the sampling data obtained for NRC-0IE Bulletin 79-02 on Sequoyah Nuclear Plant unit 2. This information is to be used by the Division - . of* Engineerihg Design's Civil Engineering Branch and not by the inspection crews. 4 A'ny questions concerning this memorandum should be directed to B. M. i McAllister, extension 6210. ES R. W. Cantrell @f u ROB:BHM TGR + Attachment cct R. O. Barnett, W9D224 C-K (2) E. G. Beasley, W12B26 C-K M. N. Culver, 249A HBB-K MEDS, E4337 C-K R. H. Mull, E7524 C-K M. N. Sprouse, WilA9 C-K e i(-{fA I l E .,.L: R,.. Ti C Cm.:nne Ranke Don.oinvl,. nn 91,o Pas,nli Ca.:.ne pin,.

I ~ .ma. 3 (i?&. .w i U. S. NUCLEAR REGULATORY COMMISSION I.E. BULLETIN 79-02 1 ANCHOR SAMPLING INSPECTION TENNESSEE VALLEY AITIHORITY SEQUOYAH NUCLEAR PLANT j -l UNIT 2 I .=.. 1 F SEPTEMBER 11,.1980 i tI g Prepared: / Supervised: f 7 Reviewed: e s Submitted: 9 'j 7aroved: 4 i. l @.. .,i 9.:.F l 1 4

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ancnor===pung m.valuac1 n critariu S:quoyrh Nucicer Plant Unit 2 Siin ANCHORAGE EVALUATION CRITERIA

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~ (1) Plug Depth Criteria (2) Edge Distance Criteria (3) Thread Engagement c'riteria (4) ' Anchor capacity criteria (5) Anchor Shell Depth Criteria PLUG DEPTH CRITERIA Plug Depth (Inches) Anchor Size Norms _1 Minimum Maximum 7/8 Inches 2-9/32 2 2-1/2 3/4 Inches 1415/16 1-3/4 221/8 5/8 Inches 145/16 1-1/8 1-1/2 y, Jiiiig G" 1/2 Inches 1-5/32 1 1-3/8 3/8 Inches 25/32 5/8 15/16 r , CRITERIA 70R EDGE DISTANCE FOR PUNCHES, REAMED, OR DRILLED HOLES Table 1.16.5 AISC Seventh Edition is to be used as the minimum criteria for edge distance for punched, reamed, or drilled holes. (Inches) ' Bolt Diameter At Sheared Edge At Rolled Edge or Gas Cut 1/2 7/8 3/4 5/8 1-1/8 7/8 3/4 1-1/4 1:. 7/8 1-1/2 1-1/8 5

nusuv...-y&2us 1.v.au uun vumia .( Sequoych Nuclocr Plcat Unit 2 1 if' f THREAD DIGA'GDhNT CRITERIA C-32 requires one bolt diameter thread engagements. For engagements less than one bolt diameter refer to the following sununary: THREAD ENGAGEMENT TO DEVELOP SELF-DRILL ANCHORS t Bolt Ult Ult Bolt Engagement to Develop Dia. G-32 A307 Use Ultimate of Anchor 1/2 7.8K 8.52K 90% 0.75 diameters 5/8 10.5 13.56 77% 0.60 diameters -3/4 14.9 20.04 74% 0.583 ' diameters 7/,8 17.8 27.72 64% 0.50 diameters

  • Based on test s at Singleton iib. memorandum " Browns Ferry Nuclear Plant -

(jjjj.'. Correlations of Thread Engagement of A307 Bolts (n Self-Drilling An'chors , v.- to Tensile Capacity-0IE Bulletin 79-02," dated August 17,i1979 i-(CSB 790820 001). t g e O e e

Sequoych N'cl7,5r Plcut. Unit 2 ~~ 'T 'i u s h:j:j.j ANQlOR SHELL DEPTH CRITERIA The present G-32 requires an anchor to set between 0 and 1/8 inch depth below the concrete surface. Due to existing field conditions, which have resulted in a substantial number of anchors set in excess g j of.1/8 inch deep, a testing program is being initiated to evaluata the structural integrity of these anchors. The intent of this test program is to extend our present G-32 anchor shell depth limitations. a, j 1* .O j i l. 1 e O 2 i , j;.i - s.e". O

... + TENNESSEE VALLEY AUTHORITY SEQUOYAH NUCLEAR PLANT t i ( ! 4} {'{ { i i j e I i. I ATTACHMENT Al 3 TO WORK PLAlfMO. 5-1206 4 PROGRAM FOR VERIFYING CORRECT INSTALLATION OF SELF-DRILLING TYPE CONCRETE ANCHORS IN UNIT 2 SAFETY RELATED SUPPORTS FOR RESPONSE TO' i NRC IE BULLETIN 79-02 9 1 ENG - >t n 9,is 0.. i u Date Q-3-20 j l 9'-3-80 oate ,e, l l

.2 Attachment Al '4 Work Plan N2. 5-1206 Page 1 of 7 4 PROGRAM FOR YERIFYING CORRECT INSTAtt.ATION em 0F SELF-drill.ING TYPE CONCRETE ANCHORS

  • kN IN UNIT 2 SAFETY RELATE 0 SUPPORTS FOR RESPONSE TO

/ NRC IE BULLETIN 79-02 i 'l i: :. COPE s .1 The purpose of this procedure is to conduct an inspection program i to verify correct installation of self-drilling type concrete anchors' { In unit 2 safety related systems.

.2 Phase I of the inspection program shall be a random sample of a minimum of 120 base plates inisafety related systems. The plates are to be on ceilings, walls and floors, and are to be readily accessible. The sample population shall consist of a minimum of one anchor per plate with the following distribution:

(A) 30 each - Base plates with 1/2 inch diameter anchor bolt assemblies. j (B) 33 each - Ba,se plates with 5/8 inch diameter anchor bolt assemblies. I j (C) 30 each - Base plates with 3/4 inch diameter anchor bolt assemblies. . h.N. (D) 30 each - Base plates with 7/8 inch diameter anchor bolt assemblies. If more than four anchors are found to be outside of the anchor i acceptance criteria, Phase II of the inspection program is to be ini tia ted. 1.3 Phase II of the inspection program shall be a random sample of an additional 120 base plates in safety related systems. The sample populaticn shall consist of a ' inimum of two anchors per plate with m the follouir.g distribution: (A) 30 eat.h - Base plates with 1/2 inch diameter anchor bolt assemblies. (B) 30 each - Base plates with 5/8 inch diameter anchor bolt assemblies. (C) 30 each - Base plates with 3/4 inch diameter anchor bolt assemblies. l (D) 30 each - Base plates with 7/8 inch diametdr anchor bolt assemblies. If more than 12 anchors total from Phase I and Phase II are found to l be outside of the anchor acceptance criteria, the inspection effort j is to be retxaluated by EN DES CEB. I !F (%v t -r l

/. i T* ' * ~ Attachment A1 Work Plan No. 5-1206 4 Page 2 of 7 i . E_F_ERENCE 4 '1 TVA Construction Specification No. G-32, " Bolt Anchors Set In Hardened Concrete" i

.2 U. S. Nuclear Regulatory Commission IE Bulletin 79-02 (Rev.1),

i Expansion Anchors Jane 21,1979, Pipe Support Base Plate Designs Using Concrete HEREQUISITES AND TOOLS 3.1 Tools for removing 1/2" thru 7/8" diameter bo'Its will be needed.

1. 2 Scale or rule with at; least 1/16" increments for taking measurements.

1.3 Center-hole hydraulic jack with gauge. l.4 Test probes for gap check. .. :1 P_TililTIONS 1.1 Attachrrent--A piecer of equipment or fixture to be fastened to hardened concrete. ' g;g: t

.2 Anchor--A threaded device for fastening attachments to hardened concrete of the following types:

.i.!.A. Expansion Anchor--An anchor which expands laterally in a drilled hole to resist pullout. 1./.C. Self-Drilling Expansion Shell Ancher--An expansion shell anchor which uses the shell for drilling the hole (designated herein - and on drawings as SSD).

1. 3 Slip During testing, an anchor shall be considered to have exhibited slip if the load indicator decreases or remains constant while increasing strain is being applied or if the load indicator decreases while a constant strain is being applied.

] 4.4 Normal Sreakof--A jagged tear that moves up and down approx-I notely 1/16 inch at the top of the anchor shell. 3r. CAUTIONS 5.1 Only one bolt at a time may be removed from each baseplate assembly. (.h.N

Attachment Al 5 W2rk Plan No. 5-1206 Page 3 of 7 $h ~ . ' ',.!4STRUCTIONS .1 Sketch each base plate on data sheet I and identify each bolt anchor with an individual anchor r}omber. Also measure the bolt anchor spacing and include on sketch. I 2 A O G BOLT SPAC ING 8, 8-0 0 OqANC HO R B 2. .2 Heasure the attachnent plate thickness and record under the "T" column on Ibta Sheet 1.

i. 3 Using a probe of thickness specified in gap table below, check each 3

bolt location for the gap between the attachment plate and concrete by., surface as shown in sketch. If the probe can touch the shell or, bolt for at least 90 degrees around the opening, measure the gap and record under gap column on Data Sheet 1. If there are areas where the gap is loss than the specified probe thickness, record "0" under gap column on Data. Sheet 1. .,/ t -7 7 y I C~_C I I s / 7] x 3:rarc l \\ l / dI \\ CORNER , &*nc cwaWAU ~ 3.HORSIZE MAX. GAP y 7/8 1/8 l 3/4 1/8 l 5/8 1/8 1/2 1/32' ("Z5: In cases u%:re the plate gap is decreased below these values af ter l reinstalla uon of bolt, indicate this in the " Remarks" column on l Data Shee: 1. l {

Attachment Al i Work Plan No. 5-1206 Page 4 of 7 .h

i. 4 Remove one holt trmi the attachment plate A.

Mcasare the bolt diameter and record under column " Size" on Sata Sheet 1. B. Measure! the distance from the top of the anchor shell to the top of the attachment.) late and record under column "L2" on Data Sheet 1. C. Check to see if the threaded end of Jhe shell has been cut off below the normal breakoff line. 1. If breakoff is normal, record "N" under column "L3" on Data Sheet 1. / 2. If normal breakof f cannot be detennined, measure the usable thread length and record ynder column "L3" on Data Sheet 1. D. Measuie the, distance from the top of the shell to the expansion plug and record under column "L1" on Data Sheet 1. 1. If the ' distance from the top of the shell to the expansion py,'a' h plug is less than the minimum plug depth as specified on Ql}} Data Sheet 1, annotate under the " Remarks" column on Data Shee t 1. Reinstall bolt and tighten to 1/8 to 1/4 turn af ter contact between bolt, washer, and plate. Continue on to.next anchor bolt assembly to be checked in the attach-ment pla te. Start with step 6.3. ~ 2. If, the distance from the top of the shell to the expansion plug is greater than the maximum plug depth as specified on Data Sheet 1, proof-?oad the anchor as follows: (a) Verify that a minimum gap of 1/8" exists between the plate and the top of the anchor shell. If no gap exists, the entire plate must be raised if testing is to be done through the plate. Otherwise, the plate must be removed to test. i (b) Apply load to anchor by inserting a threaded rod through the plate and into the shell. (c ) Load to proof-loads per General Construction Specification ilo. G-32. (d) Verify that shell has. not contacted the attachment plate. ({,.filj (e) Record data under " Remarks" column on Data Sheet 1. ,_ ~

Attachment A1 Work Plan No. 5-1206 Page 5 of 7 (a 14easure the bolt hole size and record under column "D" on Data Sheet 1. In cases where an out-of-round or oblong hole is encountered..:neasure the anximum dimension of the bolt hole and indicate the geometry of the hole on sktch on Data Sheet 1. 7 Measure the distance from TIE edge of the bolt hole to the nearest plate edge and record under column "ED" on Data Sheet 1. 1. Check bolt thread engagement and record under column "TER" on Data Sheet 1. 1. If one bolt diameter of thread engagement can be obtained, verify that "TER" is' less than "L1". If true, tighten bolt to 1/3 to 1/4 turn af ter contact of bolt, washer, and plate, record "N/A" under column "TEI" on Data Sheet I then proceed to step 6.H. if "TER" is greater than or equal to "L1", the bolt must be. replaced with one of a suitable length such that one bolt diameter of. thread engagement can be obtained and "TER" is less than "L1". Record replacement bolt thread engagement under column "TE1" on Data Sheet 1. Tighten bolt to 1/8 to (;$ 1/4 turn af ter contact of bolt, washer, and plate. Proceed W to step 6.H. 2. If one bolt diameter of thread engagemenf. cannot be obtained, the b'olt must be replaced with one of a suitable length such that ohe bolt diameter of thread engagement can be accomplished. Check the bolt thread engagement and record under column "TEI" on Data Sheet 1. Verify "TEl" is less than "L1" then tighten bolt to 1/3 to 1/4 turn af ter contact of bolt, washer, and plate. l. If the bolt assembly selected for test fails the inspection criteria, repeat steps 6.3 thru 6.4.G. for all fasteners on the plate under test. If the bolt assembly meets all inspection criteria, proceed to r. ext base plate and inspect per Section 6.0. i' 3CllMENTATION 1.1 Submit data sheets to SWP engineer for review.

7. 2 (kestionable anchors shall be rechecked and the data sheets annotated with results of the recheck.

l 1.3 Copies of the data sheets shall be sent to EN DES CEB for evaluation. 7.4 The original data sheets shall be maintained with Work Plan No. 5-1206. N

Attachment Al t

p},

o. Work Plan No. 5-1206 Page 6 of 7 + k$@. w '5 The cepleted work plan with all attachments and supporting documentation shall be stored in accordance with SNP Construction Procedure No. P-8. SNP Inspection Instruction Qata Cards and/or Data Sheets for the individual

  • .n hanger identifiers which ad affected by this inspection program shall be supplemented, reviewed, and stored in accordance with SNP Construction Procedure No. P-8.

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PWR PROJECTS CORRESPONDENCE DFORMATION SHEET ~~ SUBJECT _ ENGR RESPONSIBLE MM ACTION NO./ REFERENCE 1, / DATE ISSUED FOR TTPING /' s URGE ROUTINE DATE WANTED / ABSOLUTE DEADLINE b CX)0RDINATED WITH r-7/ 9, [Mbb$ COPYING NO. OF COPIES TELECOPY TO: MESSAGE SPECIFIC DSTRUCTIONS: e/r @6pervis6r Approval Secretary Date Received No. of Pages Document Name Notes: 1 1 ~ l l .}}

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