ML19262A969

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LER 79-020/03L-0:on 791031,during Insps of Accessible Piping,Eight Snubbers on Safety Injection Sys Piping Found Inoperable.Caused by Improper Installation of Anchor Bolts. Base Plate Redesigned & Anchor Bolts Reinstalled
ML19262A969
Person / Time
Site: Fort Calhoun Omaha Public Power District icon.png
Issue date: 12/05/1979
From: Eidem M, Kusek L
OMAHA PUBLIC POWER DISTRICT
To:
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19262A963 List:
References
LER-79-020-03L, LER-79-20-3L, NUDOCS 7912110366
Download: ML19262A969 (5)
v • d • e


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LICENSEE EVENT REPORT CONTROL BLOCK:

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3 61 EV ENT CATE REPORT D ATE 7 ER EVENT DESCRIPTION AND PRC8ABLE CONSEQUENCES h a 12 l } ring instections of accessible ricinr beine rerfo--ed in scecrir.ce sith 2 l 13ulletin 70-02, eirht snubbers en the safetr in'ection 3rsten ririnz vere f:und I 3I3 to44i ltc be incterable because of i=:rcrer ins oe 3-- ' -ba =-- " belt s . "e sir ifi m -l -

l0 i -1 IOccurence 500'. t place. 2 e probable consecuen;es 40uli b2te been the insbili-" :' I 3 i s i I the snubbers to rerfc -- their desir- fr.2-ice durin; a sei--ic e r- -

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2.-l l JI4I I 30 7 3 3 SYSTEM CAUSE CAUSE C OVP. VALVE COOE COCE SUSCOCE COMPCNiNT COCE SL8COCE SL SCOOE OI3 l3!7 l l3 l l*l l 3 !" ! U !'fO I7 ! Xl l2 l 20 3 3 13 11 !2 T3 1S 9 SEctENTI AL OCCURRENCE RE2CRT

  • EV ISiC N iVENT YEAR RFPCRT NO. 200E *YPE N C.

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_.'1 22 23 24 26 2' 23 23 00 01 J2 4CT'ON :L'UmE E :ECT S M U

  • 0 C'.'JN .. A T* AC HM E N T N P R C-4 8miVE COVP. COVPC N ENT W EN 40*: M ON 88.A N T VETWCD *CL AS 4. S U 9 Mi'* E C 3CA V W 8. SL P O '.i i a VANLP4CTLRER X 3 ' ' ^

f7 'I Y' / 3 2 O O a 4 4 4 o 40 41 42 43 44 47 CAUSE ESCRIPTION AN ' 9AECTIVE ACTICNS @

i,1 l~__ s va-a ' ~ _ ersbie due to incorrect inst alio.-icr cf ,.nchor weit = - 7.a - r-  !

i ii Irecti re action taken was redesirn er.d field T. difiestie- ^' -he ' ssa -ism e-4 I

i- 2 ltroner reinstallation of the 2nchor belts. 2ese ccdifiestions were rer"m.ed 71thir i

.i, l the time constraints of the limitine conditions for crerstien of the acMicsi sree- l i,4 1ifications and no Tech. Spec. riciation ecc'rred. f 3 9 30

  • 4C:LITY STATUS %PCWER OTHER STATUS v h0 METHCO CP OISCOVERY DISCOVERY CESCRIPTION J+

t 15 W h l3l0l0l@l :r/A j l45 C l@l46 Insrection ter 2 Bulletin 70-02 l 7 3 3 TO 12 11 44 80 ACTivtTY CON TENT 06 mELEASED OFRELEASE AMCUNT OF AC'1VITY 35 LOCATION CP RELEASE i a I:l@1:l@l :r/A l l :va l 4 3 10 44 45 30 7

PERSONNEL EXPOSURES 11 k-)

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Page 1 of 2 LER 79-020 C=aha Public Power District Fort Calhoun Station Unit No. 1 Decket No. 05000235 a..... a c.u. .. .,. .

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ing ccnditions for operation of the Fort Calhoun '%chnical Specifications.

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'"he baseplate was redesigned and the anchor bolts ased vere 1" x 12" super-

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the eight ancher bolts, fcur bolts were protruding. he base plate was

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SIS-32A is located on the inlet piping to the contain=ent scray pu=ps.

Three c' the four anchor bolts vere protrudin~. e The base plate was re-designee. and four 1" x 12" superkvik Hilte ane":r bolts were used.

SIS-33 is located on the piping frc= the contain=ent recirculation su=p to the safety injection and refueling water tank. '"he " cur anchor bolts in each of the two base plates were pretruding. The baseplates vere re-designed with t o 1" x 12" superkvik Hilte anchors per brse plate.

SIS-333 is located on the piping frc= the centain=ent recirculation su=p to the safety injection and refueling vater tank. Of the twelve anchors,

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twel a 1-1/h" x 12" regular Hilte anchers.

1528 246

Page 2 of 2 LER 79-020 C=aha Public Pever pistric Fort Calhoun Statica Unit No. 1 Docket :To. 05000265 Attach =ent No. 1 (continued) 35 _,8C *s . 'acs:ed ^. ."a , d. ,*-.4 . 3-. '+ .

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-e to the safety injection and refueling water tank. Five of the twelve

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.4 Eilte anchcrs was addei.

T 1528 247

LZR 79-020 C=aha Public Power District Fort Calhoun Station Unit No. 1 Decket No. 05000285 A..ac w ._.n.

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L=nediately after it was deter =ined that the subject snubbers should be declared inoperable, the ti=e cccstraints of the applicable liniting condition for operation of the Technical Specifications was inveked.

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thus no Tech. Spec. violation cccurred.

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LIR 79-020 C=aha Public Fover District Fort Calhoun Station Unit No. 1 Docket No. 650002S5 Attachment No. 3 Failu e Data This is the first insta=ce in which snubbers ha're had Oc be declared inc;erable and subsequently repaired as a resul: ::' base plate inspe::icns required by ' '"=-d- 79-02.

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1528 249

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