ML19345B991

LER 80-180/01T-0:on 801114,determined That Both Containment Spray Pumps Could Be Jeopardized by Blockwall Failure During Seismic Event.Caused by Nonreinforced Concrete Block Walls Not Being Designed for Seismic Events

ML19345B991
Person / Time
Site:	Sequoyah
Issue date:	11/26/1980
From:	Cottle W, Wilkey A TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19345B989	List: ML19345B988 ML19345B991
References
LER-80-180-01T, LER-80-180-1T, NUDOCS 8012030674
Download: ML19345B991 (2)

Text

_,

1

&_ y 11)-

- LICENSEE EVENT REPORT -

, ,e -

. CONTROL BLOCK: l i

l l l l' l e

Ih (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATiONI e i l T l N l S l N l P l 1 l@l 0 l 0 l -l 0 -l0 - l0 l0 l 0 l - l 0 l 0 lgl 4 l 1 l1 l1 l 1 lg[ l lg 7 8 9 LICENSEE CQQE 14 1$ LICEN$E NUMSER 25 26 LICENSE TYPE JO 67 C a t hir CON'T lol'I 3, 8 sO is CE l60L l@l64 l 5 l0DOCKl0E Tl0 l 3l 2l7 68@l6911 IlLVENT NUM0EM -

1l OATE 4 l 8 l 0 @l1l llREPORT 74 7%

2 l 6OATE l 8. l080l@

EVENT DESCRIPTION AND PROSABLE cONSEOUENCES h .

10121 l With u11t in mde 3, notification was received at 1000 CST that a safety evaluation g io t 21 l had determined that 'both containment spray pumps could be jeopardized by a block- g 1 O I A I l wall f ailure durink a seismic event. Per LCO 3.0.3 action was initiated to cool down  ;

[TTT1 I to mde 4 At 163d CST notification-was received that both RHR pumps and centrifugal g lolei i chareine Dump 1B could similarly'be jeopardized by a postulated wall failure. Plant  ;

o r i entered mde 5 at 0503 CST on 11/15/80. There was no effect on public health or g

[O l d } l safety. No previous occurrences. [

p. e9 - so SYST E M CAUSE CAU$f COMP. yetyg CODE CODE * $U8 CODE Cou'ONENT CODE SUSCOOE SueCOO E loist 2 3 i SI sl@ ,W@ l A lh l Zl Zl Z I Z l Z l Z lh lZ lh '(Z_j h 9 to 33 12 13 is 13 20 SE QU E N TI AL

• OCCunRENCE REPORT REVIUCN LERino EVENTYEAR REPonT NO, .CooE TYPE No.

ia101

~

@ agog 1-1 11I81 0l I/l P lll I Tl 1-1 [g_j

_ 28 22 2J 24 26 27 ~ 28 29 3G 38 32 i KEt7 A TO O PLANT M T 0 HOUR $ 5 8 81 i O 80 US. SUPPLIE MAN FACTURER

[.F_j@l 3J J4 Zlh lDZl@ l26 Z lh J 3l7 0l 0l 0l 0l 40 lY lg l N lg l t lg 41 42 43 lg l 9l gl9 [,

44 4; CAUSE OESCRIPTION ANO CORRECTIVE ACTIONS h l i ) o l l The non-reinforced concrete block walls were not initially designed for a seismic )

[TTTl l event. Restraints were designed and installed on five block walls which jeopardized .

Ii i 2 I i safety-related equipment for unit 1. Restraints will be installed on walls i,l3i l jeopardizing unit 2 equipment prior to startup of that unit.

it .*II i si 80

's'rN."

Iii$1 b h l0l0l0l@l 5PeaER NA Ov84En status @ $Is5SN l lDj@lDesignnotification OlsCOvEnv OEsCRietioN h i AC itv t r Y CO TEraf RELEAtt0 OP nELEASE AMOUNT OF ACTivtTY LOCA TION OF RELE A$E fiTil8LZJ 7 9 @ Lz1@l n to It 44 l l 45 NA 80 l

PERSONNEL ENPOSURES NUMM E f1 TYPE OESCRIPTION

• Ii I il I ni oln l@k_j@l NA  !

' ' ' , ER:0~

~ E 'L',~ ,u'n', E s NeMS E ., OE,CR,PT,oN@

L' L]8l'9 01 01 018112 NA l 1 il 80 LOS5 CF OR D AMAGE To FACILITY TYPE DE SCHip flON

@ W@l T . , ..

NA l

OtsCRiptios h .

NRC USE ONL '

@ issutfhl 3 s 9 l,y_

io NA l lllllllllllll

, 6s as Name of Preparer W. T. Cottle/A. K. Wilkey PHONE 613-842-8261~ --<-

_ 8012 0 a 0$M l

^

e

.o A esuG:racce mieynumu my Sequoyah Nuclear Plant LER SUPPLEMENTAL INFORMATION SQRO-50-327/80180 Technical Specifications Involved: 3.0.3, 3.5.2, and 3.6.2.1 Reported Under Technical Specification 6.9.1.12.1 Date of Occurrence: 11/14/80 Time of Occurrence: 1000 CST Conditions Prior to Occurrence Mode 3, RCS Temperature 547 degrees F and RCS Pressure 2235 psig Identification and Description of Occurrence In response to IE-Bulletin 80-11, Engineering Design evaluated the ability of certain non-reinforced concrete masonry block walls to withstand a seismic event and determined that some walls could fail. The failure of each of the walls was evaluated to determine if safety-related equipment would be affected.

At 1000 CST on 11/4/80, the plant was notified that both containment spray pumps could be jeopardized by a failure of the block walls of.the respective pump rooms.-

The pumps were declared ineperable and the plant immediately initiated action ,

to go ' to mode 4 as requires. by LCO 3.0.3.

At 1630 CST o:. 11/14/80 the plant was notified that both RHR pumps could be

' jeopardized by the containment spray pump 1B & 2B room walls and that centrifugal charging pump 1B could be jeopardized by centrifugal charging pump 1B & 2B room walls.

At 0503 CST on 11/15/80 plant entered mode 5.

Apparent Cause of Occurrence The non-reinforced concrete block walls were not initially designed for a seismic event.

Corrective Action Restraints were designed and-installed for the walls affecting unit 1 safety related equipment as shown below:

ROOM RELATED EQUIPMENT Cent. Chg. Pump 1B (inside)-- CCP 1B Jent. Chg. Pump 2B (outside) CCP 1B CCS Pump'lA (both sides) CCS LA CCS Pump 13 (both sides) CCS 1B, RHR LA CCS Pump 2 B (outside) RHR 1B Restraints will be installed _ to protect unit 2, equipment prior to startup of that unit.

Failure Data None ,

.- ,