ML18044A323
| ML18044A323 | |
| Person / Time | |
|---|---|
| Site: | Palisades  |
| Issue date: | 12/06/1979 |
| From: | Jordan E NRC OFFICE OF INSPECTION & ENFORCEMENT (IE) |
| To: | Moseley N NRC OFFICE OF INSPECTION & ENFORCEMENT (IE) |
| References | |
| NUDOCS 7912130158 | |
| Download: ML18044A323 (13) | |
Text
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!.'"~*~ ;!i UNITED STATES NUCLEAR REGULATORY COMMISSION WASHl~GTON, D. C. 20555 Docket No. 50-255 MEMORANDUM FOR:
Nonnan C. Moseley, Director Division of Reactor Operations Inspection, IE FROM:
E. L. Jordan, Assistant Director for Technical Programs, Division of Reactor Operations Inspection, IE *
SUBJECT:
SUf.t'aARY OF MEETING WITH CONSUMERS POWER COMPA~~ NOVEMBER 21, 1979 ON ANCHOR BOLT INSPECTION PROGRAM AT PALISADES.
A meeting was held on November 21, 1979 in Bethesda, Maryland to discuss the
--*- _____ anchor bolt inspection program conducted at Palisades in accordance with IE Bulletin 79-02.
The meeting agenda is provided as Enclosure 1. This meeting provided additional details of the Palisades inspection program presented, during the October 1979 meeting, to the Region III staff. A list of the November 21, 1979 meeting attende~s is provided as Enclosure 2.
An administrative question was raised by the licensee's representatives concerning the IE Bulletin 79-02 review process within NRC.
It was clarified that the NRC review process has been that the *re9ional office would review the licensee's anchor bolt inspection program for acceptability. If the regional office.,had
- questions regarding the acceptability of the inspection program, these questions would be discussed with IE:HQ and NRR, if appropriate, for resolution.
A sumr~ry of the anchor bolt testing results and the revised inspection program for Palisades was provided by Consumers Power Company (Attachments A, B, and C).
The major aspects of the revised inspection program are inspection of 100%
of the anchor bolts, inspection of all dimensions of the base plate and anchor bolt to assure adequate installation (except'.shoulder to cone measurement),
and proof load testing to~two times the design load.
The proof load testing to two times the design loadis intended to verify the load carrying capacity of the anchor bolt regardless of the shoulder to ci:>ne measurement.
The testing results to date show that one of 92 anchor.. bolts tested to the design bolt load failed the pull test and one of 112 anchor bolts tested to two times the design bolt load failed. The failure criterion used was anchor bolt pull out of 1/8-inch or 2 thread lengths.
Consumers Power Company has perfonned additional anchor bolt testing to deter-mine the effects of varying degrees of shell expansion for shell type anchor CG:iT.l.CT:
H. J. ;.;ong, iP 49-28180
Nonnan c. ft>seley 2
DEC 6 1979 bo 1 ts. Fran the 3.0 to 40 tests perfonned on various sizes of anchor bo 1 ts, Consumers Power Company claims that shell expansion is not a critical parameter and that proof testing to two times the design load will identify with a high degree of confidence those anchor bolts with reduced ultimate capacities due to incorrect installation.
Infonnation from ITT Phillips, anchor bolt manufacturer, states that the ultimate capacity of the shell type anchor bolt should be reduced to reflect the effect of partial expansion of the shell. For 7/8, 3/4 and 5/8-inch anchor bolts a 20% reduction should be taken in ultimate capacity for less than 1/8-inch from full expansion and a 45% reduction for 3/16-inch from full expansion of the shell. Similar infonnation on 1/2-inch anchor bolts was provided. Since the conclusions of Consumers Power Company and ITT Phillips differ, Consumers Power Company was requested to fonnally provide their finalized test results
- which demonstrate the effects of varying degrees of shell expansion.
Consumers Power Company is to continue to document and note deficiencies in the shoulder to cone measurement taken during the revised anchor bolt inspection program until this issue is resolved.
- The generic ba*se plate flexibility analysis and calculations done by Bechtel.
for Consumers Power Company has been reviewed and found generally acceptable.
The analysis is acceptable for those cases discussed in* the generic submittal and assumptions (such as prying is neglible) would have to be supported for base plate sizes and conditions not included.in the generic submittal. It was noted that the anchor bolt stiffness value of 350 kips per inch was being used and lesser values shown were for demonstration purposes only.
. The tentative schedule for the completion of the anchor bolt inspections is early January 1980 for the inaccessible areas and prior to March 1980 for the access*ible areas.
The possibility of a meeting with the Region III staff in mid-December on the.status of the inspections was discussed *
Enclosures:
As stated cc: *if36Cket NRC PDR Local PDR D. G. Ejsenhut, NRR.
R. H. Vollmer, NRR D. Ziemann, NRR L. c. Shao' NRR V. S. Noonan, NRR
- -
- . F. Heishman, RIII
. ;-~~~
trwar*
~ J~rdan, Assistant Director for echnical Programs Division of Reactrir Operations Inspection NRC Participants TERA IEB 79-02 Task Group L. Tri pp, RI A. Herdt, RII E. Gallagher, RIII J. Sutton, RIV P. Narbut, RV W. R. Rutherford, IE
HEETING'AGENDA CONSUMERS POWER COMPANY MEETING ON NOVEMBER 21, 1979 ON IE BULLETIN 79-02 ANCHOR BOLT INSPECTION PROGRAM AT PALISADES I. Status of Previous Random Sampli_ng Program II. Palisades' Anchor Bolt Testi_ng ~gram III. Technical Review of Shell Expansion Measurements for Shell Type Anchor Bolts (Shoulder to Cone Measurement)
Industry Review IV.
NRC Experience Feedback V.
Plans for Startup from Outage VI.
Base plate Flexibility Analysis and Calculations
- VII.
Progress Review and Schedule
~-
Encl.e. 2 MEETING AlTENDEES NOVEMBER 21, 1979 MEETING WITH CONSUMERS POWER COMPANY (PALISADES) ON ANCHOR BOLT INSPECTION PROGRAM Consumers Power Company K. Osborne NRC E. Jordan, IE:HQ H. Wong, IE:HQ J. Fair, NRR
- 0. Hoffman R. Jenkins Bechtel S. Sen J. Dotson T. Johnson J. Rotz S. Kapur R. Kies I. Yin, IE:RIII H. Ashar, SD R. Silver, NRR R. Lipinski, NRR F. Rinaldi, NRR H. Lee, NRR
l.O IN'l'RODUCTIOB CONStn.mRS POWER COMPANY P.AµSADES PLANT liRC IE BULLETIN 79-02 EXPANSION ANCHOR INSPECTION & TlSTING STATUS October 25, 1979 To 1"ul.fill the requirements of NRC IE Bul,.letin 79-02, an inspection and testing* J>rogrem vas conducted by Bechtel at the Palisades Plant using a random sm:p1ing approach.
The random sampling program consisted of testing one anchor bolt in accessible base plates distributed across various safety seismic systems.
Based on review of engineering documents and visual :field inspection, the majority of expansion type concrete e.nchors used at the Palisades Plant for safety seismic system pipe
- s\\.-pports ere Of shell type.
There also exist a number Of Supports using stud (vecige) type ezj>a.tision anchors.
2.0 EVALUATION A.
- Pul1 Testing Evaluation Ninety-tW'o sa:nples vere inspected and tested.
There vas one sample vhich did not meet the tension value acceptance criteria baseci on 1oo% of' allovable *anchor design load.
At this point Bechtel term-inated the inspection and testing program since one sample f'ailure is acceptable out of ninety~tvo tests to achieve a required 95%
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B.
Dimensional Evaluation l*~ea.su:~en:ts a.."ld ve:-ificatic:l *.. *ere made of the various inst::.llation
~ea.::t;.re:::*:?:::":.s a:!C. c-::H:r obser*,~s.tions *.. rere recorded on tbe data sheet.~.
I The review of completed data sheets has indicated the folloving:
- 1.
- Shoul.der to cone (Attachment A)
~ -
- a.
Under expanded -<fii)c 65/91).
- b.
Over expanded -
18% (17/91).
-2.
Thread engagement (Attachment A)
- a.
Between 5o% to Under 100% bolt capacity = 25% (23/91).
- 3.
Shell protnision (Attachment A)
- a.
Outside concrete surface = 25% (23/91).
- c.
Miscellaneous Observations Recorded
- 1.
Base plate size, base plate. configuration and bolt size di:N'erent than specified on original dra'Wings.
- 2.
Gap between pl:ate and concrete surface.
- 3.
Concrete or grout irregu1ari ties.
4.* Anchors embedded e.t an angle.
Even though 91 out of 92 random samples vere success:f'ul.ly tested* in tension equivalent to 100% of their working loads, there vas some question that the same random sample should also Iileet other dimen-
- sional acceptance criteria as specified in the Bechtel Specifications.
Based on the above noted dimensional evaluation results ve have dis-continued the random sample anchor bolt testing prograI:i.
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- JTIPcH~~I-1J e COBSUME:R POWER COMPANY PALISADES PLANT NRC n; BULLETIN 79-02 REVISED PROGRAM FOR IllSPEC'l'ION & TESTING OF EXPANSION ANCHORS October 25, 1979
1.0 INTRODUCTION
To :f'ul:f'ill the requirements of r.RC IE.Bulletin 79-02, tbe inspection and testing program as outlined below is proposed*for the Palisades plant i'ollo"Wing the d.iscontinuati*on of earlier random sampling inspection and testing.
. 2. 0 IRSPECTIO?-l.AIID TESTING The inspection a:nd/or testing will be perfo:rmed on all accessible anchors and base plates for each of the available safety seismic system pipe supports for the follov.i.ng parameters.
2.1 STUD TYPE e..
Stud length.
- b.
Stud diameter.
- c.
Stud projection from concrete surface.
- d.
Veri:fication that the nut is not bottomed out on tbe studs threads.
- e. Stud spacing.
- f.
Nut thl;'ead engagement.
- g.
Condition of*concrete surrounding the plate for signs of failure.
- b.
Edge distance to side of concrete member.
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- th b 1 t and '-*a-.he*r.(i*-r_
e."'i*s_~s)
- 1.
en.1.J :iu is in con.. ac
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ase pa e
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2.*2 SHELL TYPE a..
Shell protrusion
- b.
Bo1t.thre8.d engagement.
- c.
Bo1t Diameter.
- d.
Bo1t spacing.
- e.
Condition of concrete surrounding the plate.
- f. Bo1t not bottomed out on the shell arici:ior threads. *
- g.
Edge distance to side of concrete member.
- h.
Bottoming out of shell on base plate and shell cut-of:f's..
- i. Wedge cone existence (possibly determine.manu:f'actlll'er).
- j. Verify bolt bead is in contact with base plate and washer (i:f' exists) is clamped betveen bolt bead and the plate *.
2.3 BASE PLATES
- a.
Base plate dimensions.
~.:.
- b.
- BOlt hole size and configuration.
- c.
Degree of flatness, gaps betveen attachment plate and.face o;f' concrete.
2.4 TESTING REQUIREMENTS Each of the accessible anchor shells shall be tested using tension based on 200% of the allovable desigri load to verify the load.
carrYing capacity of the anchor irrespective of its instal.lation parameters such as shoulder to cone dimension.
At this time ve *do not desire to use the torque method for any significant number of tests.
2.5 *PRELOAD REQUIREMENTS
- All anchor bolts sha1l be reinstalled after inspection to a torque value equivalent to at least 100% their design allowable load.
- /ilifc.HM2.VT ~
1 CONCRETE EXPANSION ANCHORS TESTING.AND INSPECTION BASIC* *p RO GRAM*
100% INSPECTION GENERAL CONFIGUPATION ANCHOR-TO-PLATE CONNECTION GENERAL CONDITION 100% TESTING AT 2 TIMES DESIGN ALLOWABLE TENSION TORQUE REWORK AND RETEST WHERE REQUIRED
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.e 2
GENERAL CONFIGURATION
, CONFORMANCE TO PJ\\NGER SKETCH OR DRAWING ANCHOR SIZE~- SP.ACING AND EDGE DISTANCE ANCHOR-TO-PLATE CONNECTION THREAD ENGAGEMENT BOTTOMING OUT
- NUT ON STUD CSTUD TYPE)
- BOLT IN SHELL (SHELL TYPE) *
- SHaL ON PLATE <SHELL TYPE)
TESTING 3
TORQUE OR TENSION TEST OPTIONAL TENSION LOAD - 2 TIMES DESIGN ALLOWABLE TORQUE - EQUIVALENT TENSION 2 TIMES DESIGN ALLOWABLE
. OBSERVATIONS INCLUDE:
TEST LOAD ANCHOR EXTENSION ANCHOR ROTATION <TORQUE TEST)
PULL OUT OF SHELL CIF SHIMS ARE USED)
FORMATION OF CRACKS IN CONCRETE RETEST AFTER REWORK C IF REQUIRED )
'I 4.
POST TEST ASCERTAIN SHELL-TO-PLATE CLEARANCE
. REINSTALL BOLTS OR NUTS ON ANCHORS AND
-TORQUE TO SPECIFIED *VALUES RETURN HANGER TO ORIGINAL OR UPGRADED CONDITION