05000255/LER-1977-045-01, /01X-2:on 780916,initial Valve Design Did Not Consider Failure of T-ring Air Supply,Which Could Result in Loss of Containment Integrity.Backup Air Supply Installed & Retested

/01X-2:on 780916,initial Valve Design Did Not Consider Failure of T-ring Air Supply,Which Could Result in Loss of Containment Integrity.Backup Air Supply Installed & Retested

ML18043A223
Person / Time
Site:	Palisades
Issue date:	09/29/1978
From:	CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
To:
Shared Package
ML18043A222	List: 05000255/LER-1977-045, Forwards LER 77-045/01X-2 05000255/LER-1977-045-01, /01X-2:on 780916,initial Valve Design Did Not Consider Failure of T-ring Air Supply,Which Could Result in Loss of Containment Integrity.Backup Air Supply Installed & Retested
References
LER-77-045-01X, LER-77-45-1X, NUDOCS 7810170248
Download: ML18043A223 (1)

LER-1977-045, /01X-2:on 780916,initial Valve Design Did Not Consider Failure of T-ring Air Supply,Which Could Result in Loss of Containment Integrity.Backup Air Supply Installed & Retested

Event date:
Report date:
2551977045R01 - NRC Website

text

UPDATE REPORT PREVIOUS REPORT DATE:

10/18/77 PALISADES NRC FORM366 11.n1 U.S. NUCLEAR REGULATORY COMMISSION.

LICENSEE EVENT REPORT CONTROL BLOCK: I I G)

(PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) 1 e

IIEJ IM I r IP I A I L 11 101 o I o I -1 o I o I o I o I o I ~I o I o l@I 4 I 111 [ 11 IG)I I I s 7

. 8 9

LICE!"!SEE CODE 14

,5 LICENSE NUMBER

~5

• 26 LICENSE TYPE 30 57 CAT 58 © CON'T [TI1J 7

8

~; ~Io I 5 1° I o I o 12 I 5 15 1(2)1 o 19 I 1 16 I 7 I 8 @1 o I 9 12 I 9 I 718 10 60 61 COCKE& NUMBER 68 69 EVENT CATE 74 75 REPORT CATE SO EVENT DESCRIPTION ANO PROBABLE CONSEQUENCES {,O'J

[)))) 1J;nvestigation had revealed that '1:'oss of the air supply to the containment [ill] building purge ioslation valves T".'"rings would result in T-ring depress-uriz*ation, which in turn would render the valves inoperable, resulting

~-._.~~~~~~~~~~~~~~~~---~~~~~~~~~~~~~~~~__,J III[] in a loss of' containment integrity.

This

• f'ailure mode had not been

(())] considered in the FSAR.

filil

((ID 7

8 ~9-------------------------------------------------------------,--------------------180 lm:J 1

a SYSTEM

CAUSE

CAUSE.

COMP.

VALVE CODE C..QOE SUSCQOE C~PQNENt.CO.QE suac;ocE sus.i:ooE Is I 01@ i::.J@ L::J@ I V1 4 LI VI.I!; I x,e L::..J o@

9 10 11 12 13 1B 19 20

~

LER/RO CVE~Y.E;AR

\\!.!/ REPORT I q ( I.

NUMBER.

21 22 SEQUENTIAL OCCURRENCE REPORT REVISION*

1 1

• 1 ~T 1Ff°:51 1...... 1 1cry:i1

,~l.. 1=1 [J

23

24.

. 26 27 28 29 30 31 32 ACTION FUTURE EFFECT SHUTDOWN

~

ATTACHMENT NPR~

PRIMEalMP..

COMPONENT TAKEN ACTION ON PLANT METHOD HOURS 22 SUBMITTED FORM sue.

SUPPLIER MANUFASfUR~

1!.J@L!J@ !]_j(§)

1£.j@)

IO I Of O I I L!J@

LE!J@

~@ 1c 15 t: I' !'2i' 33 34 35 36 37 40 41 42 43

~.

44 47 '.::::,I CAUSE OESCRIPTION ANO CORRec*r1ve ACTIONS $)

o::I§J I Initial valve.design apparentl:Y did not consider failure of the T-riug air supplies.

Backup air supplies (accumulators) were installed and o:::rrI 1tested by April 1978.

Due to redefinition of' acceptance criteria, the air supplies were retested in August.

Af'ter minor repairs, the air supplies IJJIJ '-~~~~~~~~~~~~~~~~~~~~~~~~~~~~--~~~----J

[!JI] I passed the acceptance tests.

7 8

9 F~'fY'V

.l %PO~E~.

N/AOTHERSTATUS @

CTIIl L.::.J@ I I I. l@I l

80 7

8 9

10 12

• 13 44 ACTIVITY CONTENT IC\\

l.""T"':"tREL~ED OF R~EASE NI A AMOUNT OF ACTIVITY ~

~

LJ@L.J@I I

7 8

9 10 11 44 N/A LOC~TION OF RELEASE @

45 80 80 PERSONNEL EXPOSURES

~

NUMBER r.;::., TYPE~ CESCRIPTION

~IO!O!Ol~~--N_/_A _____________________

~

1.t 1

8 9

. 11 12 13 PERSONNEL INJURIES t:°:\\

NUMBER CESCRJPTIONl.!!I IIIIl I 010 IOl@)..._N.1_A* __ ~---------------------~~~---------------------~---------.....I 80 7

8 9

11 12 Loss OF OR DAMAGE TO FACILITY t.jJ\\

TYPE DESCRIJ'TlON

'.::::;J IIill L!J@

N;:A 80 7

8 9

10 so PUBLICITY

(;;;\\

~

'i~lf44\\ OES1fnON ~

~ C'~--------~----.;.__-------1 l I I I I I ! I I I I I I 7

8 9

10 68 69 NRC USE ONLY 80