ML112700322
| ML112700322 | |
| Person / Time | |
|---|---|
| Site: | 07001821 |
| Issue date: | 04/11/1979 |
| From: | Boskey B VOLPE, BOSKEY & LYONS |
| To: | Gossick L NRC/EDO |
| Shared Package | |
| ML112700323 | List: |
| References | |
| NUDOCS 7905150665 | |
| Download: ML112700322 (2) | |
Text
NRC FOR 7
8 CON'T 01 7
8 7
7 8
I As a result of NRC Bulletin 79-02, a special testing program was develo I ped and implemented to test pipe support base plate designs using concre I te expansion anchor bolts. The results of the testing indicated a potent I ial qeneric problem existed with the anchor bolts not meeting seismic de I sign criteria, Analysis by architect engineer concluded the failure rate I sufficiently low so as to not compromise ECCS operability in the event o I f a design basis earthquake. ECCS determined therefore to be operable.
9 so SYSTEM CAUSE CAUSE COMP.
VALVE CODE Coos SUSCOO COMPONENT CODE SUSCOOG SUsCOOS z
_C]
LBJO L @
9 10 1t 12 13 18 19 20 SEQUENTIAL OCCURRENCE REPORT REVISION LERIRO EVENT YEAR REPORT NO.
coos Typa-No.
REPORT l7 10I141 41 1 -'1 L1X NUMBER I r21 22 23 24 26 27 28 29 30 31 32 ACTION FUTURE EFFECT SHUTOOWN ATTACHMENT NPRO-4 PRIME COMP.
COMPONENT TAKEN ACTION ON PLANT METHOO HOURS 22 SUBMITTED FORM SUS.
SUPPLIER MANUFACTURER L.O uJ@
UUN@
U6 A o
o C
L.SJ@
LIJ@
L..J@
IRIlI316I 33 34 35 38 37 40 41 42
-43 4447 CAUSE DESCRIPTION ANO CORRECTIVE ACTIONS I Cause determined to be primarily fa I cause of inadequate design. The maj Tz I were made by the Phillips Drill Co.
I replaced if necessary on all seismi T1 I pipe which was sample tested. The n 782 FACILITY STATUS
%POWER OTHER STATUS I
1 09 1 21 NA I
7 a
9 10 12 13 44 ACTIVrY CONTENT RELEASED OF RELEASE AMOUNT OF ACTIVITY E
SL I zk NA 7
8 9
10 1144 PERSONNEL exPOSURES NPUMBER TYPE DESCRIPTION 39 17 01 0J0 Z (31 NA 7
8 9
11 12 13 PERSONNEL INJURIES NUMBER DESCRIPTION8 T
0 01 of1O8 NA 7
8 9
11 12 LOSS OF OR DAMAGE TO FACILITY TYPE DESCRIPTION 19I zl NA 7
8 9
10 PUBLICITY ISSUED DESCRIPTION LuJs NA 7
8 9 10 Ed Dubost NAME OF PREPARER 710sISoGet 9uf'r ulty installation with a contributing ority of the installed anchor bolts All anchor bolts have been tested aid c pipe except small chart analyzed ew anchor bolts are made by Hilti.
METHOO OF DISCOVERY IC 0 1
45 DISCOVERY QESCRIPTION G Special inspection so 46 NA LOCATION Op RELEASE
'S ao so 80 SO NRC USE ONLY 68 69 80*5 0
PNONE:319-851-5611 M 368 UAUCLEAR RSGULATORY COMMISSION LICENSEE EVENT REPORT Upda report Previous report date 7-17-79 CONTROL SLOCK:
(PLEASE PRINT OR TYP ALL REQUIRED INFORMATION)
I IA ID A IC 11 I0 0 1o0 f 0 1 0 10 1 Ia 1
o10 (D 4 1l I I 1 1 I 9
LICENSEE CODE 14 is LICENSE NUMBER S
26 LICENSE TYPE 30 57 T S8 SOURCE LL]0 10 5 10 10 01 31 311 07 10 13 17 9
1016 101)91 8 1010 60 6
DOCKET NUMBER 68 69 EVENT DATE 74 7S REPORT DATE So EVENT DESCRIPTION AND PROBABLE CONSEQUENCES I
80 l45 80
DUANE ARNOLD ENERGY CENTER Iowa Electric Light and Power.Company Licensee Event Report -
Supplemental Data Docket No. 050-0331 Licensee Event Report Date: June 9, 1980 Reportable Occurrence No:
79-014 Update report, previous report 7-17-79 Evdnt Description As a result of NRC Bulletin 79-02, a special testing program was developed and implemented to test pipe support base plate designs using concrete expansion.
anchor bolts. The results of the testing indicated a potential generic problem existed with the anchor bolts not meeting seismic design criteria. Analysis by architect engineer concluded the failure rate was sufficiently low so as to not compromise ECCS operability in the event of a design basis earthquake. All ECCS determined, therefore, to be operable.
Cause Description Cause determined to be primarily faulty installation with a contributing cause of inadequate design. The majority of the installed anchor bolts were made by the Phi lips Drill Co.
Corrective Actions An anchor bolt test and replacement program has been completed. All concrete anchor bolts on large seismic piping and on small computer-analyzed, seismic piping were tested and replaced if necessary. Replacement anchor bolts of an improved design made by Hilti have been installed. In addition a representative sample of about 14 percent of the small chart analyzed pipe supports were load tested. All supports withstood loads in excess of the maximum design load.
Page 1 of 1